/* 青少年科技素养实训计划 */
@import url('https://fonts.googleapis.com/css2?family=Ma+Shan+Zheng&display=swap');

:root {
    --qc-orange: #FF6B2C;
    --qc-orange-light: #FF8F5A;
    --qc-orange-dark: #E5521A;
    --qc-teal: #00B894;
    --qc-teal-dark: #009E7E;
    --qc-navy: #1A2B4A;
    --qc-navy-light: #2D4373;
    --qc-bg: #F7F9FC;
    --qc-white: #FFFFFF;
    --qc-text: #2C3E50;
    --qc-text-muted: #6B7C93;
    --qc-border: #E8ECF2;
    --qc-shadow: 0 4px 24px rgba(26, 43, 74, 0.08);
    --qc-shadow-hover: 0 12px 40px rgba(255, 107, 44, 0.18);
    --qc-radius: 12px;
    --qc-radius-lg: 20px;
    --header-h: 80px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
    color: var(--qc-text);
    background: var(--qc-bg);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* Header */
.qc-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--qc-border);
    z-index: 1000;
    box-shadow: 0 1px 8px rgba(0,0,0,0.04);
}

.qc-header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-width: 0;
}

.qc-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.qc-logo img,
.qc-logo-mark {
    width: 48px;
    height: 34px;
    object-fit: contain;
    flex-shrink: 0;
}

.qc-logo-text h1,
.qc-brand-row {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 10px 14px;
    line-height: 1.25;
}

.qc-brand-row--hero {
    gap: 12px 20px;
    margin-bottom: 4px;
}

.qc-brand-row--footer {
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.qc-brand-art {
    font-family: 'Ma Shan Zheng', 'STKaiti', 'KaiTi', cursive;
    font-size: 28px;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: 0.1em;
    white-space: nowrap;
    color: var(--qc-orange);
}

/* Logo 区：纯色「科创燃梦」 */
.qc-logo-text .qc-brand-art {
    background: none;
    -webkit-background-clip: unset;
    background-clip: unset;
    -webkit-text-fill-color: currentColor;
    color: var(--qc-orange);
}

/* Banner / Hero：保留渐变艺术字 */
.qc-brand-art--hero,
.qc-hero .qc-brand-art,
.qc-page-hero .qc-brand-art {
    background: linear-gradient(135deg, #FF6B2C 0%, #FFB347 40%, #E5521A 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.qc-brand-art--sm {
    font-size: 24px;
    letter-spacing: 0.08em;
}

.qc-brand-art--hero {
    font-size: clamp(40px, 6vw, 64px);
    letter-spacing: 0.12em;
}

.qc-brand-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--qc-navy);
    letter-spacing: 0.02em;
    line-height: 1.35;
}

.qc-brand-name--hero {
    font-size: clamp(20px, 2.8vw, 30px);
    font-weight: 700;
    color: rgba(255, 255, 255, 0.92);
    letter-spacing: 0.03em;
}

.qc-brand-block {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
}

.qc-brand-block--hero {
    margin-bottom: 16px;
    align-items: flex-start;
}

.qc-brand-block--footer {
    flex-direction: column;
    align-items: flex-start;
}

.qc-brand-block--footer .qc-brand-name {
    font-size: 19px;
}

.qc-page-hero .qc-brand-block {
    align-items: center;
    margin-bottom: 12px;
}

.qc-page-hero .qc-brand-row {
    justify-content: center;
}

.qc-page-hero .qc-brand-art {
    font-size: clamp(38px, 5.5vw, 54px);
    letter-spacing: 0.09em;
}

.qc-page-hero .qc-brand-name {
    font-size: clamp(19px, 2.5vw, 24px);
    color: rgba(255, 255, 255, 0.92);
}

.qc-brand-name em,
.qc-brand-name--year {
    font-style: normal;
    font-size: 12px;
    font-weight: 600;
    color: var(--qc-orange-dark);
    letter-spacing: 0.06em;
}

.qc-brand-year {
    font-size: clamp(13px, 1.8vw, 16px);
    font-weight: 600;
    color: rgba(255, 200, 160, 0.95);
    letter-spacing: 0.08em;
    white-space: nowrap;
}

.qc-logo-text .qc-brand-year,
.qc-brand-row:not(.qc-brand-row--hero) .qc-brand-year {
    font-size: 12px;
    color: var(--qc-orange-dark);
}

.qc-page-hero .qc-brand-year {
    color: rgba(255, 200, 160, 0.95);
}

.qc-sponsor-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 12px;
    color: var(--qc-text-muted);
    margin-bottom: 4px;
}

.qc-sponsor-logos {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.qc-sponsor-logo {
    display: block;
    height: 32px;
    width: auto;
    max-width: 100%;
    object-fit: contain;
}

.qc-sponsor-logo--pingan {
    height: 34px;
}

.qc-sponsor-logo--cstdf {
    height: 38px;
}

/* 官方 PNG 为黑底，深色区域用 screen 去除黑底 */
.qc-hero .qc-sponsor-logo,
.qc-page-hero .qc-sponsor-logo,
.qc-footer .qc-sponsor-logo {
    mix-blend-mode: screen;
}

.qc-sponsor-logos-x {
    color: rgba(255, 255, 255, 0.35);
    font-size: 14px;
    line-height: 1;
    user-select: none;
}

.qc-hero .qc-sponsor-logos-x {
    color: rgba(255, 255, 255, 0.45);
}

.qc-footer .qc-sponsor-logos {
    margin-bottom: 12px;
}

.qc-sponsor-logos--center {
    justify-content: center;
}

.qc-page-hero .qc-sponsor-logos {
    margin-bottom: 12px;
}

.qc-sponsor-logo--sm {
    height: 26px;
}

.qc-sponsor-logo--sm.qc-sponsor-logo--pingan {
    height: 28px;
}

.qc-sponsor-logo--sm.qc-sponsor-logo--cstdf {
    height: 30px;
}

.qc-footer-bottom-sponsors {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.qc-footer-bottom-dot {
    color: rgba(255, 255, 255, 0.35);
}

.qc-sponsor-bar strong {
    color: var(--qc-navy);
    font-weight: 600;
}

.qc-sponsor-bar span {
    color: var(--qc-border);
}

.qc-hero-sponsor {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 12px;
}

.qc-hero-sponsor strong {
    color: rgba(255, 255, 255, 0.95);
}

.qc-hero-tagline {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.88);
    margin-bottom: 12px;
    letter-spacing: 0.06em;
}

.qc-hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.qc-hero-tag {
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.85);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

/* 发布路线图 */
.qc-roadmap {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    position: relative;
}

.qc-roadmap-card {
    position: relative;
    background: var(--qc-white);
    border: 1px solid var(--qc-border);
    border-radius: 16px;
    padding: 24px 22px 22px;
    transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}

.qc-roadmap-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--qc-shadow-hover);
}

.qc-roadmap-card--core {
    border-color: rgba(255, 107, 44, 0.45);
    background: linear-gradient(180deg, #FFF9F5 0%, #fff 100%);
    box-shadow: 0 8px 32px rgba(255, 107, 44, 0.12);
}

.qc-roadmap-phase {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.04em;
    margin-bottom: 10px;
}

.qc-roadmap-phase--start { background: rgba(0, 184, 148, 0.12); color: var(--qc-teal-dark); }
.qc-roadmap-phase--benefit { background: rgba(0, 217, 255, 0.12); color: #0099B8; }
.qc-roadmap-phase--challenge { background: rgba(255, 107, 44, 0.15); color: var(--qc-orange-dark); }
.qc-roadmap-phase--show { background: rgba(108, 92, 231, 0.12); color: #6C5CE7; }

.qc-roadmap-badge {
    position: absolute;
    top: 14px;
    right: 14px;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 800;
    color: #fff;
    background: linear-gradient(135deg, #FF6B2C, #E5521A);
}

.qc-roadmap-card h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--qc-navy);
    margin-bottom: 8px;
    line-height: 1.4;
    padding-right: 40px;
}

.qc-roadmap-card--core h4 {
    color: var(--qc-orange-dark);
}

.qc-roadmap-card p {
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.75;
}

.qc-roadmap-card p strong {
    color: var(--qc-navy);
}

.qc-release-poster {
    max-width: 100%;
    border-radius: var(--qc-radius-lg);
    box-shadow: var(--qc-shadow);
    border: 1px solid var(--qc-border);
}

@media (max-width: 1024px) {
    .qc-roadmap { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .qc-roadmap { grid-template-columns: 1fr; }
}

.qc-logo-text h1 em {
    font-style: normal;
    color: var(--qc-orange);
}

.qc-logo-text p {
    font-size: 12px;
    color: var(--qc-text-muted);
}

.qc-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1 1 auto;
    min-width: 0;
    gap: 0;
}

.qc-nav a {
    padding: 8px 11px;
    font-size: 14px;
    color: var(--qc-text);
    border-radius: 8px;
    transition: all 0.2s;
    white-space: nowrap;
}

.qc-nav a:hover,
.qc-nav a.active {
    color: var(--qc-orange);
    background: rgba(255, 107, 44, 0.08);
}

.qc-nav a.highlight {
    color: var(--qc-white);
    background: linear-gradient(135deg, var(--qc-orange), var(--qc-orange-dark));
    font-weight: 600;
}

.qc-nav a.highlight:hover {
    transform: translateY(-1px);
    box-shadow: var(--qc-shadow-hover);
}

.qc-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    margin-left: 4px;
}

.qc-header-actions .qc-btn {
    padding: 7px 14px;
    font-size: 13px;
    border-radius: 18px;
    white-space: nowrap;
}

.qc-header-more {
    position: relative;
}

.qc-header-more > summary {
    list-style: none;
    cursor: pointer;
}

.qc-header-more > summary::-webkit-details-marker {
    display: none;
}

.qc-header-more-panel {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 132px;
    background: var(--qc-white);
    border: 1px solid var(--qc-border);
    border-radius: 12px;
    box-shadow: var(--qc-shadow);
    padding: 6px;
    z-index: 1002;
}

.qc-header-more-panel a {
    display: block;
    padding: 9px 12px;
    font-size: 13px;
    color: var(--qc-text);
    border-radius: 8px;
    white-space: nowrap;
}

.qc-header-more-panel a:hover {
    background: rgba(255, 107, 44, 0.08);
    color: var(--qc-orange);
}

.qc-header-actions .qc-user-greeting {
    font-size: 13px;
    color: var(--qc-text-muted);
    white-space: nowrap;
    max-width: 88px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.qc-header-user {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    gap: 1px;
    max-width: 120px;
    line-height: 1.25;
    flex-shrink: 1;
    min-width: 0;
}

.qc-header-user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--qc-navy);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
}

.qc-header-user-role {
    font-size: 11px;
    font-weight: 600;
    color: var(--qc-orange);
    white-space: nowrap;
}

.qc-header-logout {
    background: none;
    border: none;
    padding: 4px 6px;
    font-size: 12px;
    color: var(--qc-text-muted);
    cursor: pointer;
    white-space: nowrap;
    border-radius: 6px;
    transition: color 0.2s;
}

.qc-header-logout:hover {
    color: var(--qc-orange);
}

.qc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 22px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.25s;
}

.qc-btn-primary {
    background: linear-gradient(135deg, var(--qc-orange), var(--qc-orange-dark));
    color: var(--qc-white);
}

.qc-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--qc-shadow-hover);
}

.qc-btn-outline {
    background: transparent;
    color: var(--qc-navy);
    border: 1.5px solid var(--qc-border);
}

.qc-btn-outline:hover {
    border-color: var(--qc-orange);
    color: var(--qc-orange);
}

.qc-btn-teal {
    background: linear-gradient(135deg, var(--qc-teal), var(--qc-teal-dark));
    color: var(--qc-white);
}

.qc-btn-lg {
    padding: 14px 32px;
    font-size: 16px;
    border-radius: 28px;
}

.qc-mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.qc-nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--header-h);
    background: rgba(26, 43, 74, 0.35);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.25s;
}

.qc-nav-overlay.show {
    display: block;
    opacity: 1;
}

.qc-user-greeting {
    font-size: 14px;
    color: var(--qc-text-muted);
    white-space: nowrap;
}

main {
    flex: 1;
    padding-top: var(--header-h);
}

/* 活动日历 */
.qc-page-hero--calendar { background: linear-gradient(135deg, var(--qc-navy) 0%, #2a4070 100%); }

.qc-cal-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.qc-cal-filters { display: flex; flex-wrap: wrap; gap: 8px; }

.qc-cal-filter {
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid var(--qc-border);
    background: #fff;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    color: var(--qc-text);
}

.qc-cal-filter.active,
.qc-cal-filter:hover {
    background: var(--qc-orange);
    color: #fff;
    border-color: var(--qc-orange);
}

.qc-cal-month-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}

.qc-cal-month-nav button {
    width: 36px;
    height: 36px;
    border: 1px solid var(--qc-border);
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    font-size: 18px;
    color: var(--qc-navy);
}

.qc-cal-month-nav span { font-weight: 700; color: var(--qc-navy); min-width: 100px; text-align: center; }

.qc-cal-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 20px;
    align-items: start;
}

.qc-cal-grid-wrap {
    background: #fff;
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius-lg);
    overflow: hidden;
}

.qc-cal-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    background: #f3f6fb;
    font-size: 13px;
    font-weight: 700;
    color: var(--qc-navy);
}

.qc-cal-weekdays span { padding: 10px; text-align: center; }

.qc-cal-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.qc-cal-day {
    min-height: 110px;
    border-right: 1px solid var(--qc-border);
    border-bottom: 1px solid var(--qc-border);
    padding: 6px;
    cursor: pointer;
    vertical-align: top;
    transition: background 0.15s;
}

.qc-cal-day:hover:not(.other) { background: rgba(255, 107, 44, 0.04); }

.qc-cal-day.selected:not(.other) {
    background: rgba(255, 107, 44, 0.08);
    box-shadow: inset 0 0 0 2px rgba(255, 107, 44, 0.35);
}

.qc-cal-day.other { opacity: 0.4; cursor: default; }

.qc-cal-day.today .num {
    background: var(--qc-orange);
    color: #fff;
    border-radius: 8px;
}

.qc-cal-day .num {
    display: inline-flex;
    width: 28px;
    height: 28px;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 13px;
}

.qc-cal-events {
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-top: 4px;
}

.qc-cal-event-chip {
    display: block;
    padding: 4px 6px;
    border-radius: 6px;
    text-decoration: none;
    color: var(--qc-navy);
    border-left: 3px solid;
    background: rgba(26, 43, 74, 0.04);
    overflow: hidden;
}

.qc-cal-event-chip:hover {
    filter: brightness(0.97);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.qc-cal-event-chip.tag-live { border-left-color: #8b5cf6; background: rgba(139, 92, 246, 0.1); }
.qc-cal-event-chip.tag-challenge { border-left-color: var(--qc-orange); background: rgba(255, 107, 44, 0.1); }
.qc-cal-event-chip.tag-openday { border-left-color: #f59e0b; background: rgba(245, 158, 11, 0.12); }
.qc-cal-event-chip.tag-offline { border-left-color: var(--qc-teal); background: rgba(0, 184, 148, 0.1); }

.qc-cal-event-chip .chip-time {
    display: block;
    font-size: 10px;
    font-weight: 700;
    color: var(--qc-text-muted);
    line-height: 1.2;
}

.qc-cal-event-chip .chip-title {
    display: block;
    font-size: 11px;
    font-weight: 600;
    line-height: 1.3;
    margin: 1px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.qc-cal-event-chip .chip-type {
    display: block;
    font-size: 9px;
    color: var(--qc-text-muted);
    line-height: 1.2;
}

.qc-cal-more {
    display: block;
    font-size: 10px;
    color: var(--qc-orange-dark);
    font-weight: 600;
    padding: 2px 4px;
}

.dot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; flex-shrink: 0; }
.dot-live { background: #8b5cf6; }
.dot-challenge { background: var(--qc-orange); }
.dot-openday { background: #f59e0b; }
.dot-offline { background: var(--qc-teal); }

.qc-cal-side {
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    overflow: hidden;
    align-self: start;
    background: #fff;
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius-lg);
    padding: 18px;
}

.qc-cal-side-head {
    flex-shrink: 0;
}

.qc-cal-side-head h3 {
    font-size: 16px;
    color: var(--qc-navy);
    margin-bottom: 10px;
}

.qc-cal-side-subtitle {
    margin-top: 20px;
}

.qc-cal-side-body {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    margin-top: 4px;
    padding-right: 4px;
    -webkit-overflow-scrolling: touch;
}

.qc-cal-side-body::-webkit-scrollbar {
    width: 5px;
}

.qc-cal-side-body::-webkit-scrollbar-thumb {
    background: rgba(26, 43, 74, 0.18);
    border-radius: 999px;
}

.qc-cal-side p { font-size: 13px; color: var(--qc-text-muted); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }

.qc-cal-side-hint {
    font-size: 12px;
    color: var(--qc-text-muted);
    margin: -4px 0 12px;
    line-height: 1.5;
    display: block !important;
}

.qc-cal-event {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--qc-border);
    text-decoration: none;
    color: inherit;
}

.qc-cal-event:last-child { border-bottom: none; }

.qc-cal-event strong { display: block; font-size: 14px; color: var(--qc-navy); margin: 4px 0; }

.qc-cal-event small { font-size: 12px; color: var(--qc-text-muted); }

.qc-cal-event .tag,
.qc-cal-card .tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
}

.tag-live { background: rgba(139,92,246,0.12); color: #7c3aed; }
.tag-challenge { background: rgba(255,107,44,0.12); color: var(--qc-orange-dark); }
.tag-openday { background: rgba(245,158,11,0.15); color: #d97706; }
.tag-offline { background: rgba(0,184,148,0.12); color: var(--qc-teal-dark); }

.qc-cal-empty { font-size: 13px; color: var(--qc-text-muted); padding: 12px 0; }

.qc-cal-section-title { margin: 28px 0 16px; font-size: 20px; color: var(--qc-navy); }

.qc-cal-upcoming {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.qc-cal-card {
    background: #fff;
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
    padding: 16px;
    transition: box-shadow 0.2s;
}

.qc-cal-card:hover { box-shadow: var(--qc-shadow-hover); }

.qc-cal-card a { text-decoration: none; color: inherit; }

.qc-cal-card h4 { margin: 8px 0 6px; font-size: 15px; color: var(--qc-navy); }

.qc-cal-card p { font-size: 12px; color: var(--qc-text-muted); margin: 0; }

/* 成果展厅 */
.qc-show-tabs, .qc-show-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }

.qc-show-tab, .qc-show-filter {
    padding: 8px 18px;
    border-radius: 999px;
    border: 1px solid var(--qc-border);
    background: #fff;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}

.qc-show-tab.active, .qc-show-filter.active,
.qc-show-tab:hover, .qc-show-filter:hover {
    background: var(--qc-orange);
    color: #fff;
    border-color: var(--qc-orange);
}

.qc-show-panel { display: none; }
.qc-show-panel.active { display: block; }

.qc-show-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.qc-show-card {
    background: #fff;
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius-lg);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.qc-show-card:hover { transform: translateY(-4px); box-shadow: var(--qc-shadow-hover); }

.qc-show-card a { text-decoration: none; color: inherit; display: block; }

.qc-show-thumb.has-cover {
    background-size: cover;
    background-repeat: no-repeat;
}

.qc-show-thumb.has-cover::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.05) 40%, rgba(0,0,0,0.45) 100%);
}

.qc-showcase-cover-hero {
    margin: 0 0 24px;
    border-radius: var(--qc-radius-lg);
    overflow: hidden;
    border: 1px solid var(--qc-border);
    box-shadow: var(--qc-shadow);
}

.qc-showcase-cover-hero img {
    display: block;
    width: 100%;
    height: 300px;
    object-fit: cover;
}

.qc-showcase-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0 4px;
}

.qc-showcase-tech-chip {
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(10, 36, 99, 0.06);
    color: var(--qc-navy);
    font-size: 12px;
    font-weight: 600;
}

.qc-showcase-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.qc-showcase-gallery-item {
    margin: 0;
    border-radius: var(--qc-radius);
    overflow: hidden;
    border: 1px solid var(--qc-border);
    background: #fff;
}

.qc-showcase-gallery-item img {
    display: block;
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.qc-showcase-gallery-item figcaption {
    padding: 10px 12px;
    font-size: 12px;
    color: var(--qc-text-muted);
    line-height: 1.5;
}

.qc-demo-stage.has-cover-bg {
    background-color: #1a2b4a;
}

.qc-demo-slide-img {
    margin: 0 0 14px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.2);
}

.qc-demo-slide-img img {
    display: block;
    width: 100%;
    height: 140px;
    object-fit: cover;
}

.qc-show-thumb {
    height: 160px;
    background-size: cover;
    background-position: center;
    position: relative;
    background-color: #eef2f7;
}

.qc-show-thumb.qc-thumb-ai { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.qc-show-thumb.qc-thumb-energy { background: linear-gradient(135deg, #f7971e 0%, #ffd200 100%); }
.qc-show-thumb.qc-thumb-bio { background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%); }
.qc-show-thumb.qc-thumb-manufacturing { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.qc-show-thumb.qc-thumb-eco { background: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%); }
.qc-show-thumb.qc-thumb-city { background: linear-gradient(135deg, #2193b0 0%, #6dd5ed 100%); }
.qc-show-thumb.qc-thumb-digital { background: linear-gradient(135deg, #ee9ca7 0%, #ffdde1 100%); }
.qc-show-thumb.qc-thumb-aerospace { background: linear-gradient(135deg, #141E30 0%, #243B55 100%); }
.qc-show-thumb.qc-thumb-default { background: linear-gradient(135deg, #FF6B2C 0%, #E5521A 100%); }

.qc-show-thumb span {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(26,43,74,0.85);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
}

.qc-show-body { padding: 16px 18px 18px; }

.qc-show-body h3 { font-size: 16px; color: var(--qc-navy); margin-bottom: 8px; line-height: 1.45; }

.qc-show-body .meta { font-size: 12px; color: var(--qc-text-muted); margin-bottom: 4px; }

.qc-show-body .meta-sub {
    font-size: 11px;
    color: var(--qc-text-muted);
    opacity: 0.85;
    margin-bottom: 8px;
    line-height: 1.5;
}

.qc-show-body .desc { font-size: 13px; color: var(--qc-text-muted); line-height: 1.65; margin-bottom: 10px; }

.qc-show-body .tags em {
    font-style: normal;
    font-size: 11px;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(255,107,44,0.1);
    color: var(--qc-orange-dark);
    margin-right: 6px;
}

.qc-show-stories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.qc-story-card {
    background: #fff;
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius-lg);
    padding: 22px 22px 20px;
    box-shadow: 0 4px 18px rgba(10, 36, 99, 0.06);
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
}

.qc-story-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--qc-orange) 0%, #ffb347 100%);
}

.qc-story-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--qc-shadow-hover);
}

.qc-story-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.qc-story-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center 20%;
    flex-shrink: 0;
    border: 2px solid rgba(255, 107, 44, 0.35);
    box-shadow: 0 2px 8px rgba(255, 107, 44, 0.15);
}

.qc-story-avatar--fallback {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    font-size: 20px;
    font-weight: 700;
}

.qc-story-meta {
    min-width: 0;
}

.qc-story-name {
    display: block;
    font-size: 16px;
    color: var(--qc-navy);
    margin-bottom: 4px;
}

.qc-story-school {
    display: block;
    font-size: 12px;
    color: var(--qc-text-muted);
    line-height: 1.5;
}

.qc-story-grade {
    display: inline-block;
    margin-left: 6px;
    padding: 1px 8px;
    border-radius: 999px;
    background: rgba(255, 107, 44, 0.1);
    color: var(--qc-orange-dark);
    font-size: 11px;
    font-weight: 600;
}

.qc-story-result {
    display: inline-block;
    margin-bottom: 12px;
    font-size: 13px;
    font-weight: 600;
    color: var(--qc-orange);
    text-decoration: none;
    line-height: 1.5;
}

.qc-story-result:hover {
    text-decoration: underline;
    color: var(--qc-orange-dark);
}

.qc-story-quote {
    margin: 0;
    font-size: 14px;
    line-height: 1.8;
    color: var(--qc-text);
}

.qc-story-quote-mark {
    color: var(--qc-orange);
    font-weight: 700;
    font-size: 16px;
    line-height: 0;
}

/* 兼容旧 markup */
.qc-story {
    background: #fff;
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
    padding: 20px;
    border-left: 4px solid var(--qc-orange);
}

.qc-story strong { display: block; margin-bottom: 8px; color: var(--qc-navy); }

.qc-story-challenge {
    display: block;
    margin-bottom: 8px;
    font-size: 12px;
    color: var(--qc-orange);
    font-weight: 600;
}

.qc-story p { margin: 0; line-height: 1.75; color: var(--qc-text); }

/* 首页活动日历 */
.qc-home-cal-widget {
    background: #fff;
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius-lg);
    padding: 20px;
    box-shadow: var(--qc-shadow);
}

.qc-home-cal-widget .qc-cal-day { min-height: 96px; }

.qc-home-cal-widget .qc-cal-event-chip .chip-title { font-size: 10px; }

@media (max-width: 900px) {
    .qc-cal-layout { grid-template-columns: 1fr; }
    .qc-cal-day { min-height: 88px; }
    .qc-home-cal-widget .qc-cal-day { min-height: 80px; }
    .qc-cal-side { height: auto !important; max-height: none !important; }
    .qc-cal-side-body { max-height: 280px; }
}

.qc-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero */
.qc-hero {
    position: relative;
    z-index: 2;
    height: 560px;
    min-height: 560px;
    display: flex;
    align-items: stretch;
    overflow: hidden;
    background: linear-gradient(135deg, #1A2B4A 0%, #2D4373 50%, #1A2B4A 100%);
}

.qc-hero-carousel {
    position: relative;
    z-index: 3;
    max-width: 1200px;
    margin: 0 auto;
    padding: 52px 56px 44px;
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-sizing: border-box;
}

.qc-hero-slides {
    position: relative;
    height: 420px;
    min-height: 420px;
}

.qc-hero-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.55s ease, visibility 0.55s ease;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: visible;
}

.qc-hero-slide.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* 临时隐藏的 Banner 页：必须压过 .qc-hero-slide 的 display:flex */
.qc-hero-slide[hidden],
.qc-hero-dot[hidden],
.qc-hero-bg[hidden] {
    display: none !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

.qc-hero-slide-label {
    display: inline-block;
    align-self: flex-start;
    padding: 4px 14px;
    margin-bottom: 14px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--qc-orange-light);
    background: rgba(255, 107, 44, 0.15);
    border: 1px solid rgba(255, 107, 44, 0.3);
}

.qc-hero-slide-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    color: #fff;
    margin-bottom: 14px;
    line-height: 1.25;
}

.qc-hero-flow {
    font-size: clamp(26px, 4vw, 40px);
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
    line-height: 1.25;
}

.qc-hero-flow-highlight {
    color: var(--qc-orange);
}

.qc-hero-arrow {
    opacity: 0.45;
    font-weight: 400;
    margin: 0 4px;
}

.qc-hero-roadmap-mini {
    list-style: none;
    margin: 0 0 20px;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    max-width: 720px;
}

.qc-hero-roadmap-mini li {
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.85);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    line-height: 1.45;
}

.qc-hero-roadmap-mini strong {
    color: var(--qc-orange-light);
    margin-right: 8px;
}

.qc-hero-slide[data-slide="1"] .qc-hero-slide-label {
    margin-bottom: 10px;
}

.qc-hero-slide[data-slide="1"] .qc-hero-desc {
    margin-bottom: 14px;
    font-size: 16px;
    max-width: 680px;
    line-height: 1.6;
}

.qc-hero-slide[data-slide="2"] {
    justify-content: flex-start;
    padding-top: 4px;
}

.qc-hero-slide[data-slide="2"] .qc-hero-slide-label {
    margin-bottom: 10px;
}

.qc-hero-slide[data-slide="2"] .qc-hero-slide-title {
    margin-bottom: 10px;
}

.qc-hero-slide[data-slide="2"] .qc-hero-desc {
    margin-bottom: 12px;
    font-size: 16px;
    line-height: 1.55;
}

.qc-hero-slide[data-slide="2"] .qc-hero-stats--slide {
    margin-bottom: 14px;
}

.qc-hero-slide[data-slide="2"] .qc-hero-actions {
    position: relative;
    z-index: 2;
}

.qc-hero-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
    z-index: 3;
}

.qc-hero-nav:hover {
    background: rgba(255, 107, 44, 0.35);
    border-color: rgba(255, 107, 44, 0.5);
}

.qc-hero-prev { left: 8px; }
.qc-hero-next { right: 8px; }

.qc-hero-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 16px;
    flex-shrink: 0;
}

.qc-hero-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    padding: 0;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.3);
    transition: transform 0.2s, background 0.2s;
}

.qc-hero-dot.active {
    background: var(--qc-orange);
    transform: scale(1.25);
}

.qc-hero-dot:hover {
    background: rgba(255, 255, 255, 0.55);
}

.qc-hero-dot.active:hover {
    background: var(--qc-orange-light);
}

.qc-hero-bg-wrap {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.qc-hero-bg {
    position: absolute;
    inset: 0;
}

.qc-hero-bg--photo {
    background-size: cover;
    background-position: center;
    opacity: 0;
    transform: scale(1.06);
    transition: opacity 0.85s ease, transform 0.85s ease;
    will-change: opacity, transform;
}

.qc-hero-bg--photo.active {
    opacity: 1;
    transform: scale(1);
    animation: qc-hero-kenburns 12s ease-out forwards;
}

@keyframes qc-hero-kenburns {
    from { transform: scale(1); }
    to { transform: scale(1.05); }
}

.qc-hero-btn-outline {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.4);
}

.qc-hero-btn-outline:hover {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.7);
    background: rgba(255, 255, 255, 0.08);
}

.qc-hero-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(90deg, rgba(26, 43, 74, 0.9) 0%, rgba(26, 43, 74, 0.62) 42%, rgba(26, 43, 74, 0.28) 100%),
        linear-gradient(180deg, rgba(26, 43, 74, 0.15) 0%, rgba(26, 43, 74, 0.45) 100%);
    pointer-events: none;
}

.qc-hero-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 24px;
    width: 100%;
}

.qc-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(255, 107, 44, 0.2);
    border: 1px solid rgba(255, 107, 44, 0.4);
    border-radius: 20px;
    color: var(--qc-orange-light);
    font-size: 13px;
    margin-bottom: 20px;
}

.qc-hero h2 {
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 800;
    color: var(--qc-white);
    line-height: 1.2;
    margin-bottom: 16px;
}

.qc-hero h2 span {
    color: var(--qc-orange);
}

.qc-hero-desc {
    font-size: 18px;
    color: rgba(255,255,255,0.85);
    max-width: 560px;
    margin-bottom: 32px;
}

.qc-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 0;
}

.qc-hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}

.qc-hero-stats.qc-hero-stats--slide {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin: 4px 0 16px;
    gap: 12px 20px;
}

.qc-hero-stats.qc-hero-stats--slide .qc-stat-item strong {
    font-size: clamp(30px, 4vw, 42px);
}

.qc-stat-item strong {
    display: block;
    font-size: 32px;
    font-weight: 800;
    color: var(--qc-orange);
}

.qc-stat-item span {
    font-size: 13px;
    color: rgba(255,255,255,0.7);
}

/* Section */
.qc-section {
    padding: 80px 0;
}

.qc-section-alt {
    background: var(--qc-white);
}

.qc-section-header {
    text-align: center;
    margin-bottom: 48px;
}

.qc-section-tag {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(255, 107, 44, 0.1);
    color: var(--qc-orange);
    border-radius: 16px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
}

.qc-section-header h3 {
    font-size: 32px;
    font-weight: 800;
    color: var(--qc-navy);
    margin-bottom: 12px;
}

.qc-section-header p {
    font-size: 16px;
    color: var(--qc-text-muted);
    max-width: 640px;
    margin: 0 auto;
}

/* Feature cards */
.qc-section-features {
    background: linear-gradient(180deg, #FAFBFD 0%, var(--qc-bg) 100%);
}

.qc-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.qc-feature-card {
    position: relative;
    background: var(--qc-white);
    border-radius: 16px;
    padding: 36px 28px 32px;
    text-align: left;
    border: 1px solid var(--qc-border);
    transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
    overflow: hidden;
}

.qc-feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #00D9FF, #F5C842);
    opacity: 0;
    transition: opacity 0.3s;
}

.qc-feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(0, 217, 255, 0.35);
    box-shadow: 0 16px 48px rgba(26, 43, 74, 0.08);
}

.qc-feature-card:hover::before {
    opacity: 1;
}

.qc-feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 0 24px;
    background: rgba(0, 217, 255, 0.06);
    border: 1px solid rgba(0, 217, 255, 0.18);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #00B8D9;
    transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.qc-feature-icon svg {
    width: 32px;
    height: 32px;
}

.qc-feature-card:hover .qc-feature-icon {
    background: rgba(0, 217, 255, 0.1);
    border-color: rgba(0, 217, 255, 0.35);
    color: #0099B8;
}

.qc-feature-card--accent::before {
    background: linear-gradient(90deg, var(--qc-orange), var(--qc-orange-dark));
}

.qc-feature-card--accent .qc-feature-icon {
    background: rgba(255, 107, 44, 0.08);
    border-color: rgba(255, 107, 44, 0.22);
    color: var(--qc-orange);
}

.qc-feature-card--accent:hover .qc-feature-icon {
    background: rgba(255, 107, 44, 0.14);
    border-color: rgba(255, 107, 44, 0.38);
    color: var(--qc-orange-dark);
}

.qc-feature-num {
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 40px;
    font-weight: 800;
    line-height: 1;
    color: rgba(26, 43, 74, 0.05);
    letter-spacing: -0.02em;
    user-select: none;
}

.qc-feature-card h4 {
    font-size: 19px;
    font-weight: 700;
    color: var(--qc-navy);
    margin-bottom: 12px;
    letter-spacing: 0.02em;
}

.qc-feature-card p {
    font-size: 14px;
    color: var(--qc-text-muted);
    line-height: 1.85;
}

/* Online challenge highlight */
.qc-online-banner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    background: linear-gradient(135deg, var(--qc-navy) 0%, var(--qc-navy-light) 100%);
    border-radius: var(--qc-radius-lg);
    padding: 48px;
    color: var(--qc-white);
    overflow: hidden;
}

.qc-online-banner img {
    border-radius: var(--qc-radius);
    width: 100%;
    height: 280px;
    object-fit: cover;
}

.qc-online-desc {
    opacity: 0.85;
    margin-bottom: 8px;
    line-height: 1.7;
}

.qc-online-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
}

.qc-online-btn-outline {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
}

.qc-online-btn-outline:hover {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.08);
}

.qc-online-visual {
    position: relative;
    min-height: 280px;
    border-radius: var(--qc-radius);
    background:
        radial-gradient(circle at 30% 30%, rgba(255, 107, 44, 0.35) 0%, transparent 55%),
        radial-gradient(circle at 70% 70%, rgba(0, 217, 255, 0.25) 0%, transparent 50%),
        rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 28px;
    padding: 32px;
}

.qc-online-visual-card {
    text-align: center;
    padding: 28px 36px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 16px;
    backdrop-filter: blur(8px);
}

.qc-online-visual-tag {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 12px;
    border-radius: 999px;
    background: rgba(255, 107, 44, 0.25);
    color: var(--qc-orange-light);
    font-size: 12px;
    font-weight: 700;
}

.qc-online-visual-card strong {
    display: block;
    font-size: 22px;
    margin-bottom: 8px;
}

.qc-online-visual-card p {
    font-size: 14px;
    opacity: 0.8;
}

.qc-online-visual-flow {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    opacity: 0.85;
}

.qc-online-visual-flow span:nth-child(even) {
    opacity: 0.5;
    font-weight: 400;
}

.qc-honor-badge {
    margin-top: 8px;
    padding: 10px 24px;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(255, 107, 44, 0.35), rgba(255, 143, 90, 0.2));
    border: 1px solid rgba(255, 107, 44, 0.45);
    color: #FFD6C2;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.06em;
}

/* 关于页 */
.qc-about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 8px;
}

.qc-about-stat {
    text-align: center;
    padding: 20px 12px;
    background: var(--qc-white);
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
    box-shadow: var(--qc-shadow);
}

.qc-about-stat strong {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--qc-orange);
    margin-bottom: 6px;
}

.qc-about-stat span {
    font-size: 13px;
    color: var(--qc-text-muted);
}

.qc-about-flow {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.qc-about-flow li {
    padding: 8px 18px;
    background: rgba(255, 107, 44, 0.08);
    border: 1px solid rgba(255, 107, 44, 0.2);
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    color: var(--qc-orange-dark);
}

.qc-about-flow li:not(:last-child)::after {
    content: none;
}

@media (max-width: 768px) {
    .qc-about-stats { grid-template-columns: repeat(2, 1fr); }
    .qc-about-stat strong { font-size: 22px; }
}

.qc-online-banner h4 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 16px;
}

.qc-online-banner h4 span { color: var(--qc-orange); }

.qc-online-list {
    margin: 24px 0;
}

.qc-online-list li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    font-size: 15px;
    color: rgba(255,255,255,0.85);
}

.qc-online-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--qc-teal);
    font-weight: bold;
}

/* Challenge cards */
.qc-challenge-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.qc-challenge-card {
    background: var(--qc-white);
    border-radius: var(--qc-radius-lg);
    overflow: hidden;
    box-shadow: var(--qc-shadow);
    border: 1px solid var(--qc-border);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.qc-challenge-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--qc-shadow-hover);
}

.qc-challenge-thumb {
    position: relative;
    height: 180px;
    overflow: hidden;
    background: linear-gradient(135deg, #2D4373 0%, #1A2B4A 100%);
}

.qc-challenge-thumb::before {
    content: attr(data-category);
    position: absolute;
    bottom: 16px;
    left: 16px;
    right: 16px;
    font-size: 28px;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.12);
    line-height: 1.2;
    pointer-events: none;
    z-index: 0;
}

.qc-challenge-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s;
    z-index: 0;
}

.qc-challenge-region,
.qc-challenge-status {
    z-index: 2;
}

.qc-thumb-ai { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.qc-thumb-energy { background: linear-gradient(135deg, #f7971e 0%, #ffd200 100%); }
.qc-thumb-bio { background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%); }
.qc-thumb-manufacturing { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.qc-thumb-eco { background: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%); }
.qc-thumb-city { background: linear-gradient(135deg, #2193b0 0%, #6dd5ed 100%); }
.qc-thumb-aerospace { background: linear-gradient(135deg, #141E30 0%, #243B55 100%); }
.qc-thumb-digital { background: linear-gradient(135deg, #ee9ca7 0%, #ffdde1 100%); }
.qc-thumb-default { background: linear-gradient(135deg, #FF6B2C 0%, #E5521A 100%); }

.qc-challenge-thumb::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 85% 15%, rgba(255,255,255,0.18) 0%, transparent 40%),
        linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.25) 100%);
    pointer-events: none;
}

.qc-challenge-card:hover .qc-challenge-thumb img {
    transform: scale(1.05);
}

.qc-challenge-region {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 12px;
    background: rgba(26, 43, 74, 0.85);
    color: var(--qc-white);
    font-size: 12px;
    border-radius: 12px;
}

.qc-challenge-status {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 12px;
    font-size: 12px;
    border-radius: 12px;
    font-weight: 600;
}

.qc-status-open { background: var(--qc-teal); color: white; }
.qc-status-hot { background: var(--qc-orange); color: white; }
.qc-status-new { background: #6C5CE7; color: white; }

.qc-challenge-body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.qc-challenge-enterprise {
    font-size: 12px;
    color: var(--qc-orange);
    font-weight: 600;
    margin-bottom: 6px;
}

.qc-challenge-body h4 {
    font-size: 17px;
    color: var(--qc-navy);
    margin-bottom: 8px;
    line-height: 1.4;
}

.qc-challenge-desc {
    font-size: 13px;
    color: var(--qc-text-muted);
    margin-bottom: 16px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.qc-challenge-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.qc-tag {
    padding: 3px 10px;
    background: var(--qc-bg);
    color: var(--qc-text-muted);
    font-size: 12px;
    border-radius: 10px;
}

.qc-challenge-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--qc-border);
    font-size: 12px;
    color: var(--qc-text-muted);
}

.qc-challenge-meta strong {
    color: var(--qc-navy);
}

/* Map section */
.qc-map-section {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    align-items: start;
}

.qc-map-visual {
    background: var(--qc-white);
    border-radius: var(--qc-radius-lg);
    padding: 24px 24px 16px;
    box-shadow: var(--qc-shadow);
    border: 1px solid var(--qc-border);
}

.qc-map-chart-head {
    text-align: center;
    font-size: 14px;
    color: var(--qc-text-muted);
    margin-bottom: 8px;
    letter-spacing: 0.04em;
}

.qc-china-map-chart {
    width: 100%;
    height: 440px;
    min-height: 320px;
}

.qc-map-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 440px;
    color: var(--qc-text-muted);
    font-size: 14px;
}

.qc-map-hint {
    text-align: center;
    font-size: 12px;
    color: var(--qc-text-muted);
    margin-top: 8px;
    padding-bottom: 4px;
}

.qc-map-svg {
    width: 100%;
    height: auto;
}

.qc-map-dot {
    cursor: pointer;
    transition: r 0.2s;
}

.qc-map-dot:hover { r: 8; }

.qc-region-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.qc-region-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: var(--qc-white);
    border-radius: var(--qc-radius);
    border: 1px solid var(--qc-border);
    cursor: pointer;
    transition: all 0.2s;
}

.qc-region-item:hover,
.qc-region-item.active {
    border-color: var(--qc-orange);
    background: rgba(255, 107, 44, 0.04);
}

.qc-region-item strong {
    color: var(--qc-navy);
}

.qc-region-count {
    padding: 4px 12px;
    background: rgba(255, 107, 44, 0.1);
    color: var(--qc-orange);
    border-radius: 12px;
    font-size: 13px;
    font-weight: 600;
}

/* Process steps */
.qc-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    counter-reset: step;
}

.qc-step {
    text-align: center;
    position: relative;
}

.qc-step-num {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--qc-orange), var(--qc-orange-dark));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 800;
}

.qc-step h4 {
    font-size: 16px;
    color: var(--qc-navy);
    margin-bottom: 8px;
}

.qc-step p {
    font-size: 13px;
    color: var(--qc-text-muted);
}

/* Filter bar */
.qc-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 32px;
    padding: 20px;
    background: var(--qc-white);
    border-radius: var(--qc-radius);
    box-shadow: var(--qc-shadow);
    border: 1px solid var(--qc-border);
}

.qc-filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.qc-filter-group label {
    font-size: 13px;
    color: var(--qc-text-muted);
    white-space: nowrap;
}

.qc-filter-select,
.qc-filter-input {
    padding: 8px 14px;
    border: 1px solid var(--qc-border);
    border-radius: 8px;
    font-size: 14px;
    color: var(--qc-text);
    background: var(--qc-bg);
    outline: none;
}

.qc-filter-select:focus,
.qc-filter-input:focus {
    border-color: var(--qc-orange);
}

.qc-filter-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.qc-pill {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    border: 1px solid var(--qc-border);
    background: var(--qc-white);
    transition: all 0.2s;
}

.qc-pill:hover,
.qc-pill.active {
    background: var(--qc-orange);
    color: white;
    border-color: var(--qc-orange);
}

/* Page hero (sub pages) */
.qc-page-hero {
    background: linear-gradient(135deg, var(--qc-navy), var(--qc-navy-light));
    padding: 60px 0;
    color: white;
    text-align: center;
}

.qc-page-hero h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
}

.qc-page-hero p {
    font-size: 16px;
    color: rgba(255,255,255,0.8);
    max-width: 600px;
    margin: 0 auto;
}

/* Detail page */
.qc-detail-page {
    max-width: 920px;
    margin: 0 auto;
    padding: 24px 0 100px;
}

.qc-detail-hero {
    position: relative;
    width: 100%;
    height: 360px;
    border-radius: var(--qc-radius-lg);
    overflow: hidden;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #2D4373 0%, #1A2B4A 100%);
}

.qc-detail-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.qc-detail-status-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    z-index: 2;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
}

.qc-detail-head-block {
    margin-bottom: 20px;
}

.qc-detail-category {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--qc-teal-dark);
    background: rgba(0, 184, 148, 0.1);
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 12px;
}

.qc-detail-title {
    font-size: clamp(24px, 4vw, 32px);
    color: var(--qc-navy);
    line-height: 1.35;
    margin: 0 0 10px;
}

.qc-detail-enterprise {
    font-size: 16px;
    font-weight: 600;
    color: var(--qc-orange-dark);
    margin: 0 0 14px;
}

.qc-detail-location {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 16px 20px;
    background: rgba(255, 107, 44, 0.08);
    border: 1px solid rgba(255, 107, 44, 0.15);
    border-radius: 12px;
    margin-bottom: 20px;
}

.qc-detail-location-label {
    font-size: 14px;
    color: var(--qc-text-muted);
}

.qc-detail-location strong {
    font-size: 16px;
    color: var(--qc-orange-dark);
}

.qc-detail-meta-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 28px;
}

.qc-detail-meta-item {
    background: var(--qc-white);
    border: 1px solid var(--qc-border);
    border-radius: 12px;
    padding: 14px 16px;
    box-shadow: var(--qc-shadow);
}

.qc-detail-meta-item span {
    display: block;
    font-size: 12px;
    color: var(--qc-text-muted);
    margin-bottom: 6px;
}

.qc-detail-meta-item strong {
    font-size: 15px;
    color: var(--qc-navy);
    font-weight: 700;
}

.qc-detail-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.qc-detail-list {
    margin: 0;
    padding-left: 20px;
    color: var(--qc-text-muted);
    line-height: 1.75;
}

.qc-detail-list li { margin-bottom: 8px; }

.qc-detail-section--reward {
    background: rgba(255, 107, 44, 0.06);
    border-color: rgba(255, 107, 44, 0.15);
}

.qc-detail-section--reward p {
    color: var(--qc-orange-dark);
    font-weight: 600;
}

.qc-detail-section--muted {
    background: var(--qc-bg);
}

.qc-open-teams-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.qc-open-teams-head h3 {
    margin: 0;
}

.qc-open-teams-head span {
    font-size: 13px;
    color: var(--qc-teal-dark);
    font-weight: 600;
}

.qc-open-team-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.qc-open-team-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 18px;
    background: var(--qc-bg);
    border: 1px solid var(--qc-border);
    border-radius: 12px;
}

.qc-open-team-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 4px;
}

.qc-open-team-slots-pill {
    flex-shrink: 0;
    font-size: 12px;
    color: var(--qc-teal-dark);
    background: rgba(0, 184, 148, 0.1);
    padding: 2px 10px;
    border-radius: 999px;
    font-weight: 600;
}

.qc-open-team-intro {
    margin: 6px 0 8px;
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.6;
}

.qc-open-team-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.qc-open-team-tag {
    font-size: 11px;
    color: var(--qc-navy);
    background: var(--qc-white);
    border: 1px solid var(--qc-border);
    padding: 2px 8px;
    border-radius: 6px;
}

.qc-open-team-actions {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    flex-shrink: 0;
    min-width: 96px;
}

.qc-open-team-actions .qc-btn-join-team {
    text-align: center;
}

.qc-open-team-card--mine {
    background: rgba(0, 184, 148, 0.06);
    border-color: rgba(0, 184, 148, 0.35);
}

.qc-open-team-mine-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    color: #fff;
    background: var(--qc-teal);
    padding: 2px 8px;
    border-radius: 6px;
    margin-bottom: 4px;
}

.qc-team-modal-mine-banner {
    background: rgba(0, 184, 148, 0.1);
    color: var(--qc-teal-dark);
    font-size: 13px;
    font-weight: 600;
    padding: 8px 12px;
    border-radius: 8px;
    margin-bottom: 16px;
    text-align: center;
}

.qc-open-team-name {
    display: block;
    font-size: 16px;
    color: var(--qc-navy);
    margin-bottom: 4px;
}

.qc-open-team-meta,
.qc-open-team-need,
.qc-open-team-slots {
    margin: 0 0 4px;
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.5;
}

.qc-open-team-need { color: var(--qc-teal-dark); }

.qc-open-team-full { color: var(--qc-orange-dark); font-weight: 600; }

.qc-detail-apply-bar {
    position: sticky;
    bottom: 0;
    z-index: 50;
    margin-top: 24px;
    padding: 18px 20px;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius-lg);
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.06);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.qc-detail-apply-intro strong {
    display: block;
    font-size: 16px;
    color: var(--qc-navy);
    margin-bottom: 4px;
}

.qc-detail-apply-intro span {
    font-size: 13px;
    color: var(--qc-text-muted);
}

.qc-detail-apply-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.qc-detail-apply-actions .qc-btn {
    min-width: 140px;
    text-align: center;
}

.qc-detail-layout {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 32px;
    padding: 40px 0 80px;
}

.qc-detail-main {
    background: var(--qc-white);
    border-radius: var(--qc-radius-lg);
    padding: 32px;
    box-shadow: var(--qc-shadow);
    border: 1px solid var(--qc-border);
}

.qc-detail-sidebar {
    position: sticky;
    top: calc(var(--header-h) + 24px);
}

.qc-detail-card {
    background: var(--qc-white);
    border-radius: var(--qc-radius-lg);
    padding: 24px;
    box-shadow: var(--qc-shadow);
    border: 1px solid var(--qc-border);
    margin-bottom: 20px;
}

.qc-detail-cover {
    width: 100%;
    height: 320px;
    border-radius: var(--qc-radius);
    margin-bottom: 24px;
    background: linear-gradient(135deg, #2D4373 0%, #1A2B4A 100%);
    position: relative;
    overflow: hidden;
}

.qc-detail-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.qc-detail-cover::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.15) 0%, transparent 45%),
        linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.2) 100%);
}

.qc-detail-cover.qc-thumb-ai { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.qc-detail-cover.qc-thumb-energy { background: linear-gradient(135deg, #f7971e 0%, #ffd200 100%); }
.qc-detail-cover.qc-thumb-bio { background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%); }
.qc-detail-cover.qc-thumb-manufacturing { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.qc-detail-cover.qc-thumb-eco { background: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%); }
.qc-detail-cover.qc-thumb-city { background: linear-gradient(135deg, #2193b0 0%, #6dd5ed 100%); }
.qc-detail-cover.qc-thumb-aerospace { background: linear-gradient(135deg, #141E30 0%, #243B55 100%); }
.qc-detail-cover.qc-thumb-digital { background: linear-gradient(135deg, #ee9ca7 0%, #ffdde1 100%); }
.qc-detail-cover.qc-thumb-default { background: linear-gradient(135deg, #FF6B2C 0%, #E5521A 100%); }

.qc-detail-main h2 {
    font-size: 26px;
    color: var(--qc-navy);
    margin-bottom: 16px;
}

.qc-detail-section {
    margin-top: 32px;
}

.qc-detail-section h3 {
    font-size: 18px;
    color: var(--qc-navy);
    margin-bottom: 12px;
    padding-left: 12px;
    border-left: 4px solid var(--qc-orange);
}

.qc-detail-section p,
.qc-detail-section li {
    font-size: 15px;
    color: var(--qc-text-muted);
    line-height: 1.8;
}

.qc-detail-section ul {
    padding-left: 20px;
    list-style: disc;
}

.qc-detail-section li { margin-bottom: 8px; }

.qc-info-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--qc-border);
    font-size: 14px;
}

.qc-info-row:last-child { border-bottom: none; }

.qc-info-row span:first-child { color: var(--qc-text-muted); }
.qc-info-row span:last-child { color: var(--qc-navy); font-weight: 600; }

.qc-detail-sidebar-actions {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--qc-border);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.qc-detail-sidebar-actions .qc-btn {
    width: 100%;
    text-align: center;
    justify-content: center;
}

.qc-detail-action-hint {
    margin: 0 0 4px;
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.6;
}

.qc-detail-main .qc-detail-category {
    display: inline-block;
    margin-bottom: 12px;
}

.qc-detail-main .qc-challenge-enterprise {
    margin-bottom: 8px;
}

.qc-detail-section--first {
    margin-top: 20px;
}

.qc-detail-section--note {
    background: var(--qc-bg);
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
    padding: 20px 24px;
}

.qc-detail-section--note h3 {
    margin-bottom: 10px;
}

.qc-detail-reward-text {
    color: var(--qc-orange-dark);
    font-weight: 600;
    margin: 0;
}

.qc-detail-cover .qc-detail-status-badge {
    z-index: 3;
}

.qc-detail-main .qc-open-team-card {
    background: var(--qc-white);
}

.qc-detail-sidebar-actions .qc-btn[aria-disabled="true"] {
    opacity: 0.45;
    pointer-events: none;
}

/* 成果演示详情页 */
.qc-showcase-crumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 24px 0 8px;
    font-size: 13px;
    color: var(--qc-text-muted);
}

.qc-showcase-crumb a {
    color: var(--qc-orange);
    text-decoration: none;
    font-weight: 600;
}

.qc-showcase-crumb a:hover { text-decoration: underline; }

.qc-showcase-detail-layout {
    padding-top: 8px;
}

.qc-showcase-detail-head {
    margin-bottom: 8px;
}

.qc-showcase-detail-badges {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.qc-showcase-result-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    background: var(--qc-navy);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

.qc-showcase-source-challenge {
    font-size: 13px;
    color: var(--qc-text-muted);
    margin: 0 0 6px;
    line-height: 1.6;
}

.qc-showcase-source-challenge a {
    color: var(--qc-text-muted);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.qc-showcase-source-challenge a:hover {
    color: var(--qc-orange);
}

.qc-showcase-source-side {
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.65;
    margin: 0 0 8px;
}

.qc-link-subtle {
    font-size: 12px;
    color: var(--qc-text-muted);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.qc-link-subtle:hover {
    color: var(--qc-orange);
}

.qc-detail-card-muted {
    background: rgba(239, 246, 255, 0.5);
}

.qc-detail-card-hint {
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.7;
    margin: 0 0 12px;
}

.qc-showcase-type {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(255, 107, 44, 0.12);
    color: var(--qc-orange);
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 0;
}

.qc-showcase-honor-badge {
    display: inline-block;
    margin-left: 0;
    padding: 4px 12px;
    border-radius: 999px;
    background: linear-gradient(135deg, #ffd700 0%, #ffb347 100%);
    color: #5c3d00;
    font-size: 12px;
    font-weight: 800;
}

.qc-showcase-detail-meta {
    font-size: 14px;
    color: var(--qc-text-muted);
    margin: 8px 0 12px;
}

.qc-showcase-demo {
    margin: 28px 0 24px;
    padding: 20px;
    border-radius: var(--qc-radius-lg);
    background: linear-gradient(180deg, rgba(239, 246, 255, 0.9) 0%, #fff 100%);
    border: 1px solid rgba(10, 36, 99, 0.08);
}

.qc-showcase-demo-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.qc-showcase-demo-head h3 {
    margin: 0;
    font-size: 17px;
    color: var(--qc-navy);
}

.qc-showcase-demo-mode {
    font-size: 12px;
    font-weight: 700;
    color: var(--qc-text-muted);
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--qc-border);
}

.qc-demo-stage {
    position: relative;
    min-height: 280px;
    border-radius: var(--qc-radius);
    overflow: hidden;
    padding: 28px 24px 20px;
    color: #fff;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.qc-demo-slides-wrap {
    position: relative;
    min-height: 220px;
}

.qc-demo-slide {
    display: none;
    animation: qcDemoFade 0.35s ease;
}

.qc-demo-slide.active { display: block; }

@keyframes qcDemoFade {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.qc-demo-slide-num {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    opacity: 0.75;
    margin-bottom: 12px;
}

.qc-demo-slide h4 {
    font-size: 22px;
    margin: 0 0 12px;
    line-height: 1.35;
}

.qc-demo-slide p {
    font-size: 15px;
    line-height: 1.75;
    opacity: 0.92;
    margin: 0 0 12px;
}

.qc-demo-slide ul {
    margin: 0;
    padding-left: 18px;
    font-size: 14px;
    line-height: 1.7;
    opacity: 0.9;
}

.qc-demo-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 18px;
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.qc-demo-nav-btn {
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}

.qc-demo-nav-btn:hover {
    background: rgba(255, 255, 255, 0.22);
}

.qc-demo-dots {
    display: flex;
    gap: 8px;
    align-items: center;
}

.qc-demo-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.35);
    cursor: pointer;
    padding: 0;
}

.qc-demo-dot.active {
    background: #fff;
    transform: scale(1.15);
}

.qc-demo-play {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: none;
    background: rgba(10, 20, 40, 0.42);
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background 0.2s ease;
}

.qc-demo-play:hover,
.qc-demo-play.is-playing {
    background: rgba(10, 20, 40, 0.28);
}

.qc-demo-play-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.18);
    border: 2px solid rgba(255, 255, 255, 0.65);
    font-size: 24px;
    padding-left: 4px;
}

.qc-demo-caption {
    margin: 12px 0 0;
    font-size: 12px;
    color: var(--qc-text-muted);
    text-align: center;
}

.qc-showcase-metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 8px;
}

.qc-showcase-metric {
    padding: 16px 14px;
    border-radius: var(--qc-radius);
    background: #fff;
    border: 1px solid var(--qc-border);
    text-align: center;
}

.qc-showcase-metric strong {
    display: block;
    font-size: 22px;
    color: var(--qc-orange);
    margin-bottom: 4px;
}

.qc-showcase-metric span {
    font-size: 12px;
    color: var(--qc-text-muted);
    line-height: 1.4;
}

.qc-showcase-files {
    list-style: none;
    margin: 0;
    padding: 0;
}

.qc-showcase-file {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding: 12px 14px;
    border: 1px solid var(--qc-border);
    border-radius: 10px;
    margin-bottom: 8px;
    background: rgba(248, 251, 255, 0.7);
}

.qc-showcase-file.is-done .qc-showcase-file-icon {
    color: #16a34a;
}

.qc-showcase-file-icon {
    width: 22px;
    font-weight: 800;
    color: var(--qc-text-muted);
}

.qc-showcase-file-name {
    flex: 1;
    font-size: 14px;
    color: var(--qc-navy);
    font-weight: 600;
}

.qc-showcase-file em {
    font-size: 12px;
    color: var(--qc-text-muted);
    font-style: normal;
}

.qc-showcase-review {
    margin: 0;
    padding: 20px 22px;
    border-radius: var(--qc-radius);
    background: linear-gradient(135deg, rgba(62, 146, 204, 0.08) 0%, rgba(255, 107, 44, 0.06) 100%);
    border-left: 4px solid var(--qc-orange);
}

.qc-showcase-review p {
    margin: 0 0 10px;
    font-size: 15px;
    line-height: 1.8;
    color: var(--qc-text);
}

.qc-showcase-review footer {
    font-size: 13px;
    color: var(--qc-text-muted);
    font-weight: 600;
}

.qc-showcase-timeline {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 2px solid rgba(255, 107, 44, 0.25);
}

.qc-showcase-timeline li {
    position: relative;
    padding: 0 0 18px 18px;
}

.qc-showcase-timeline li::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--qc-orange);
}

.qc-showcase-timeline-date {
    display: block;
    font-size: 12px;
    color: var(--qc-text-muted);
    margin-bottom: 4px;
}

.qc-showcase-timeline strong {
    display: block;
    color: var(--qc-navy);
    margin-bottom: 4px;
}

.qc-showcase-timeline p {
    margin: 0;
    font-size: 13px;
    color: var(--qc-text-muted);
}

.qc-team-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.qc-team-chip {
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(62, 146, 204, 0.1);
    color: var(--qc-navy);
    font-size: 13px;
    font-weight: 600;
}

.qc-story-challenge a {
    color: inherit;
    text-decoration: none;
}

.qc-story-challenge a:hover {
    color: var(--qc-orange);
    text-decoration: underline;
}

@media (max-width: 768px) {
    .qc-showcase-metrics {
        grid-template-columns: 1fr;
    }

    .qc-demo-stage {
        min-height: 240px;
        padding: 20px 16px 16px;
    }

    .qc-demo-slide h4 {
        font-size: 18px;
    }
}

/* Enterprise publish form */
.qc-form-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 0 80px;
}

.qc-form-card {
    background: var(--qc-white);
    border-radius: var(--qc-radius-lg);
    padding: 40px;
    box-shadow: var(--qc-shadow);
    border: 1px solid var(--qc-border);
}

.qc-form-group {
    margin-bottom: 24px;
}

.qc-form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--qc-navy);
    margin-bottom: 8px;
}

.qc-form-group label .required {
    color: var(--qc-orange);
}

.qc-form-group input,
.qc-form-group select,
.qc-form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--qc-border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
}

.qc-form-group input:focus,
.qc-form-group select:focus,
.qc-form-group textarea:focus {
    border-color: var(--qc-orange);
}

.qc-form-group textarea { min-height: 120px; resize: vertical; }

.qc-form-hint {
    font-size: 12px;
    color: var(--qc-text-muted);
    margin-top: 6px;
}

.qc-form-note {
    padding: 16px;
    background: rgba(0, 184, 148, 0.08);
    border-radius: 8px;
    font-size: 13px;
    color: var(--qc-teal-dark);
    margin-bottom: 24px;
    border-left: 4px solid var(--qc-teal);
}

/* Challenge enroll page */
.qc-page-hero--compact {
    padding: 40px 0;
}

.qc-page-hero--compact h2 {
    font-size: 28px;
}

.qc-enroll-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 32px;
    padding: 40px 0 80px;
    align-items: start;
}

.qc-enroll-main {
    min-width: 0;
}

.qc-enroll-sidebar {
    position: sticky;
    top: calc(var(--header-h) + 24px);
}

.qc-enroll-form-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--qc-navy);
    margin: 0 0 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--qc-border);
}

.qc-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 0;
}

.qc-form-row .qc-form-group {
    margin-bottom: 20px;
}

.qc-enroll-radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 8px;
}

.qc-enroll-radio {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--qc-navy);
    cursor: pointer;
    font-weight: 500;
}

.qc-enroll-radio input[type='radio'] {
    width: auto;
    padding: 0;
    margin: 0;
    accent-color: var(--qc-orange);
}

.qc-enroll-agree {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: var(--qc-text-muted);
    line-height: 1.65;
    margin: 8px 0 24px;
    cursor: pointer;
}

.qc-enroll-agree input[type='checkbox'] {
    width: auto;
    padding: 0;
    margin-top: 3px;
    flex-shrink: 0;
    accent-color: var(--qc-orange);
}

.qc-enroll-agree a {
    color: var(--qc-teal-dark);
    text-decoration: underline;
}

.qc-enroll-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin-top: 8px;
}

.qc-enroll-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--qc-teal-dark);
    background: rgba(0, 184, 148, 0.12);
    padding: 4px 10px;
    border-radius: 999px;
    margin-bottom: 12px;
}

.qc-enroll-gate {
    padding: 40px 0 80px;
    max-width: 560px;
    margin: 0 auto;
}

.qc-enroll-gate .qc-form-card {
    text-align: center;
}

#qc-enroll-root .qc-empty {
    padding: 40px 0 80px;
    max-width: 560px;
    margin: 0 auto;
}

.qc-publish-success .qc-empty-icon {
    font-size: 56px;
}

#qc-enroll-root .qc-detail-card h4 {
    font-size: 18px;
    color: var(--qc-navy);
    margin: 8px 0 16px;
    line-height: 1.45;
}

#qc-team-fields[hidden] {
    display: none !important;
}

/* Challenge detail · process / rewards / mentors / teams */
.qc-detail-lead {
    font-size: 14px;
    color: var(--qc-text-muted);
    line-height: 1.75;
    margin: 0 0 16px;
}

.qc-process-timeline {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.qc-process-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.qc-process-num {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 107, 44, 0.12);
    color: var(--qc-orange-dark);
    font-size: 14px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.qc-process-item strong {
    display: block;
    color: var(--qc-navy);
    margin-bottom: 4px;
}

.qc-process-item p {
    margin: 0;
    font-size: 14px;
    color: var(--qc-text-muted);
    line-height: 1.65;
}

.qc-rewards-list {
    margin: 0;
    padding-left: 20px;
    color: var(--qc-text-muted);
    line-height: 1.8;
}

.qc-rewards-list li { margin-bottom: 8px; }

.qc-mentor-groups {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.qc-mentor-group h4 {
    font-size: 15px;
    color: var(--qc-navy);
    margin: 0 0 12px;
}

.qc-mentor-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.qc-mentor-card {
    display: flex;
    gap: 14px;
    padding: 16px;
    background: var(--qc-bg);
    border: 1px solid var(--qc-border);
    border-radius: 12px;
}

.qc-mentor-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--qc-orange) 0%, var(--qc-orange-dark) 100%);
    color: #fff;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.qc-mentor-card strong {
    display: block;
    color: var(--qc-navy);
    margin-bottom: 2px;
}

.qc-mentor-title {
    display: block;
    font-size: 12px;
    color: var(--qc-orange-dark);
    margin-bottom: 6px;
}

.qc-mentor-card p {
    margin: 0;
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.6;
}

.qc-team-list-section { margin-top: 8px; }

.qc-team-list-table {
    border: 1px solid var(--qc-border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--qc-white);
}

.qc-team-list-head,
.qc-team-list-row {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr 0.9fr 0.7fr 0.8fr 88px;
    gap: 10px;
    align-items: center;
    padding: 12px 14px;
    font-size: 13px;
}

.qc-team-list-head {
    background: rgba(0, 184, 148, 0.08);
    font-weight: 600;
    color: var(--qc-navy);
}

.qc-team-list-row {
    border-top: 1px solid var(--qc-border);
    color: var(--qc-text-muted);
}

.qc-team-col-name { font-weight: 600; color: var(--qc-navy); }

.qc-team-name-trigger {
    background: none;
    border: none;
    padding: 0;
    font: inherit;
    font-weight: 600;
    color: var(--qc-navy);
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.qc-team-joinable-yes { color: var(--qc-teal-dark); font-weight: 500; }
.qc-team-joinable-no { color: var(--qc-text-muted); }

.qc-btn-join-team {
    display: inline-block;
    padding: 6px 10px;
    font-size: 12px;
    color: #fff;
    background: var(--qc-orange);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    white-space: nowrap;
}

.qc-btn-join-team:hover { background: var(--qc-orange-dark); }

.qc-team-join-disabled { font-size: 12px; color: var(--qc-text-muted); }

.qc-enroll-team-panel {
    margin-top: 24px;
}

.qc-enroll-team-panel .qc-detail-section {
    margin: 0;
    padding: 0;
    border: none;
}

.qc-enroll-team-panel .qc-team-list-section h3 {
    font-size: 18px;
}

.qc-team-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.qc-team-modal[hidden] { display: none !important; }

.qc-team-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
}

.qc-team-modal-content {
    position: relative;
    width: min(520px, 100%);
    background: var(--qc-white);
    border-radius: 16px;
    padding: 28px 24px 24px;
    box-shadow: var(--qc-shadow);
}

.qc-team-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border: none;
    background: var(--qc-bg);
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    color: var(--qc-text-muted);
}

.qc-team-modal-title {
    margin: 0 0 12px;
    color: var(--qc-navy);
}

.qc-team-modal-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 20px;
    font-size: 13px;
    color: var(--qc-text-muted);
    margin-bottom: 16px;
}

.qc-team-modal-intro,
.qc-team-modal-count {
    font-size: 14px;
    color: var(--qc-text-muted);
    line-height: 1.7;
    margin: 0 0 12px;
}

.qc-team-modal-actions {
    margin-top: 20px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.qc-team-modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.qc-team-modal-block {
    margin-bottom: 16px;
}

.qc-team-modal-block h4 {
    margin: 0 0 8px;
    font-size: 14px;
    color: var(--qc-navy);
    padding-left: 10px;
    border-left: 3px solid var(--qc-orange);
}

.qc-team-modal-actions .qc-btn {
    text-align: center;
}

.qc-enroll-mode-banner {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 20px;
    border-radius: var(--qc-radius);
    margin-bottom: 20px;
    border: 1px solid;
}

.qc-enroll-mode-banner--create {
    background: rgba(0, 184, 148, 0.08);
    border-color: rgba(0, 184, 148, 0.25);
}

.qc-enroll-mode-banner--join {
    background: rgba(255, 107, 44, 0.08);
    border-color: rgba(255, 107, 44, 0.25);
}

.qc-enroll-mode-banner--solo {
    background: rgba(67, 97, 238, 0.08);
    border-color: rgba(67, 97, 238, 0.25);
}

.qc-enroll-mode-banner-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--qc-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.qc-enroll-mode-banner h3 {
    margin: 0 0 6px;
    font-size: 16px;
    color: var(--qc-navy);
}

.qc-enroll-mode-banner p {
    margin: 0;
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.7;
}

.qc-enroll-selected-team {
    background: var(--qc-white);
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
    padding: 18px 20px;
    margin-bottom: 20px;
    box-shadow: var(--qc-shadow);
}

.qc-enroll-selected-team-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
}

.qc-enroll-selected-team-label {
    display: block;
    font-size: 12px;
    color: var(--qc-text-muted);
    margin-bottom: 2px;
}

.qc-enroll-selected-team-name {
    font-size: 18px;
    color: var(--qc-navy);
}

.qc-enroll-selected-team-change {
    display: inline-block;
    margin-top: 10px;
    font-size: 13px;
    color: var(--qc-orange);
    text-decoration: none;
}
.qc-enroll-selected-team-change:hover { text-decoration: underline; }

.qc-input-readonly {
    background: var(--qc-bg) !important;
    color: var(--qc-text-muted) !important;
    cursor: not-allowed;
}

@media (max-width: 1024px) {
    .qc-enroll-layout {
        grid-template-columns: 1fr;
    }

    .qc-enroll-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .qc-form-row {
        grid-template-columns: 1fr;
    }

    .qc-enroll-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .qc-enroll-actions .qc-btn {
        width: 100%;
        text-align: center;
    }

    .qc-form-card {
        padding: 24px 20px;
    }

    .qc-detail-meta-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .qc-open-team-card {
        flex-direction: column;
        align-items: stretch;
    }

    .qc-open-team-actions {
        flex-direction: row;
        width: 100%;
    }

    .qc-open-team-actions .qc-btn,
    .qc-open-team-actions .qc-btn-join-team {
        flex: 1;
    }

    .qc-team-list-head,
    .qc-team-list-row {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .qc-team-list-head span:not(:first-child),
    .qc-team-list-row span:not(.qc-team-col-name):not(.qc-team-col-action) {
        font-size: 12px;
    }

    .qc-team-col-action { margin-top: 4px; }
}

.qc-partners {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 32px;
    align-items: center;
}

.qc-partner-item {
    padding: 16px 28px;
    background: var(--qc-white);
    border-radius: var(--qc-radius);
    font-size: 15px;
    font-weight: 600;
    color: var(--qc-text-muted);
    border: 1px solid var(--qc-border);
}

/* Footer */
.qc-footer {
    background: var(--qc-navy);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 24px;
}

.qc-footer-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) repeat(3, minmax(132px, auto));
    gap: 32px 48px;
    margin-bottom: 40px;
    align-items: start;
}

.qc-footer-brand {
    min-width: 0;
}

.qc-footer-col {
    min-width: 132px;
}

.qc-footer-brand h4 {
    font-size: 20px;
    color: white;
    margin-bottom: 12px;
}

.qc-footer-brand .qc-brand-name {
    color: rgba(255, 255, 255, 0.92);
}

.qc-footer-brand .qc-brand-name em {
    color: var(--qc-orange-light);
}

.qc-footer-brand h4 em {
    color: var(--qc-orange);
    font-style: normal;
}

.qc-footer-brand p {
    font-size: 13px;
    line-height: 1.8;
    margin-bottom: 16px;
}

@media (min-width: 1025px) {
    .qc-footer-brand > p {
        max-width: 460px;
    }

    .qc-footer .qc-sponsor-logos {
        flex-wrap: nowrap;
    }
}

.qc-footer-platform {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255,255,255,0.08);
    border-radius: 8px;
    font-size: 12px;
    color: rgba(255,255,255,0.6);
}

.qc-footer-col h5 {
    font-size: 14px;
    color: white;
    margin-bottom: 16px;
}

.qc-footer-col a {
    display: block;
    font-size: 13px;
    padding: 6px 0;
    transition: color 0.2s;
    white-space: nowrap;
}

.qc-footer-col a:hover { color: var(--qc-orange); }

.qc-footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    flex-wrap: wrap;
    gap: 12px;
}

/* Empty state */
.qc-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--qc-text-muted);
}

.qc-empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

/* Toast */
.qc-toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 14px 28px;
    background: var(--qc-navy);
    color: white;
    border-radius: 24px;
    font-size: 14px;
    z-index: 9999;
    opacity: 0;
    transition: all 0.3s;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.qc-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* 培养体系 · 课程详情 */
.qc-course-detail-layout {
    padding: 32px 0 64px;
}

.qc-course-hero {
    border-radius: var(--qc-radius-lg);
    padding: 32px 28px;
    margin-bottom: 28px;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.08), rgba(255, 255, 255, 0.95));
    border: 1px solid var(--qc-border);
}

.qc-course-hero.qc-course-icon--stem {
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.1), rgba(255, 255, 255, 0.95));
}

.qc-course-hero.qc-course-icon--clips {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(255, 255, 255, 0.95));
}

.qc-course-hero.qc-course-icon--esg {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(255, 255, 255, 0.95));
}

.qc-course-hero-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(255, 107, 44, 0.12);
    color: var(--qc-orange);
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 12px;
}

.qc-course-hero h2 {
    margin: 0 0 10px;
    font-size: 28px;
    color: var(--qc-navy);
}

.qc-course-hero-sub {
    margin: 0 0 16px;
    color: var(--qc-text-muted);
    font-size: 15px;
    line-height: 1.7;
}

.qc-course-path {
    display: grid;
    gap: 14px;
}

.qc-course-path-step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: 14px 16px;
    background: var(--qc-bg);
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
}

.qc-course-path-idx {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--qc-orange);
    color: white;
    font-size: 13px;
    font-weight: 700;
}

.qc-course-path-step strong {
    display: block;
    color: var(--qc-navy);
    margin-bottom: 4px;
}

.qc-course-path-step p {
    margin: 0;
    font-size: 13px;
    color: var(--qc-text-muted);
    line-height: 1.6;
}

.qc-course-structure {
    display: grid;
    gap: 12px;
}

.qc-course-structure-block {
    padding: 16px 18px;
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
    background: white;
}

.qc-course-structure-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.qc-course-structure-head strong {
    color: var(--qc-navy);
}

.qc-course-structure-head span {
    font-size: 12px;
    color: var(--qc-text-muted);
}

.qc-course-structure-block ul {
    margin: 0;
    padding-left: 18px;
    color: var(--qc-text-muted);
    font-size: 14px;
    line-height: 1.8;
}

.qc-course-bridge {
    background: rgba(255, 107, 44, 0.06);
    border-radius: var(--qc-radius);
    padding: 20px 22px;
    border: 1px solid rgba(255, 107, 44, 0.15);
}

.qc-course-catalog-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 8px 12px;
    margin-bottom: 16px;
}

.qc-course-catalog-links a {
    color: var(--qc-navy);
    font-weight: 600;
    text-decoration: none;
}

.qc-course-catalog-links a:hover {
    color: var(--qc-orange);
}

.qc-course-catalog-links span {
    color: var(--qc-border);
}

.qc-course-platform-note {
    font-size: 13px;
    color: var(--qc-text-muted);
}

.qc-course-platform-note a {
    color: var(--qc-orange);
    text-decoration: none;
}

.qc-course-platform-note a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 1024px) {
    .qc-features { grid-template-columns: repeat(2, 1fr); }
    .qc-challenge-grid { grid-template-columns: repeat(2, 1fr); }
    .qc-steps { grid-template-columns: repeat(2, 1fr); }
    .qc-online-banner { grid-template-columns: 1fr; }
    .qc-map-section { grid-template-columns: 1fr; }
    .qc-detail-layout { grid-template-columns: 1fr; }
    .qc-enroll-layout { grid-template-columns: 1fr; }
    .qc-footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .qc-footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 1320px) {
    .qc-logo-text p { display: none; }
    .qc-brand-name { font-size: 15px; }
    .qc-nav a { padding: 8px 8px; font-size: 13px; }
    .qc-header-actions .qc-btn { padding: 7px 12px; font-size: 12px; }
}

@media (max-width: 768px) {
    .qc-china-map-chart,
    .qc-map-loading {
        height: 320px;
    }
    .qc-nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: var(--header-h);
        left: 0; right: 0;
        background: white;
        padding: 16px;
        box-shadow: var(--qc-shadow);
        border-bottom: 1px solid var(--qc-border);
        z-index: 1001;
        max-height: calc(100vh - var(--header-h));
        overflow-y: auto;
    }
    .qc-nav.open {
        display: flex;
    }
    .qc-nav a {
        width: 100%;
        padding: 12px 16px;
    }
    .qc-mobile-toggle { display: block; }
    .qc-header-inner { position: relative; }
    .qc-features,
    .qc-challenge-grid,
    .qc-steps { grid-template-columns: 1fr; }
    .qc-hero {
        height: auto;
        min-height: 500px;
    }
    .qc-hero-carousel { padding: 40px 40px 36px; }
    .qc-hero-slides {
        height: 400px;
        min-height: 400px;
    }
    .qc-hero-roadmap-mini { grid-template-columns: 1fr; }
    .qc-hero-nav { display: none; }
    .qc-hero-stats.qc-hero-stats--slide {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 16px 20px;
    }
    .qc-hero-stats.qc-hero-stats--slide .qc-stat-item strong { font-size: 28px; }
    .qc-hero-content { padding: 48px 24px; }
    .qc-hero-stats { gap: 24px; }
    .qc-stat-item strong { font-size: 26px; }
    .qc-section { padding: 48px 0; }
    .qc-footer-grid { grid-template-columns: 1fr; }

    .qc-footer-brand {
        grid-column: auto;
    }

    .qc-footer-col a {
        white-space: normal;
    }
    .qc-header-actions .qc-btn-outline { display: none; }
    .qc-header-actions .qc-header-more { display: none; }
    .qc-header-user { max-width: 88px; }
    .qc-header-user-name { max-width: 88px; font-size: 12px; }
    .qc-user-greeting { display: none; }
    .qc-brand-art { font-size: 24px; letter-spacing: 0.08em; }
    .qc-brand-art--hero { font-size: 36px; letter-spacing: 0.1em; }
    .qc-brand-name { font-size: 13px; }
    .qc-brand-row { gap: 8px 10px; }
    .qc-logo-text p { font-size: 11px; }
    .qc-online-visual { min-height: 220px; padding: 24px; }
}

/* 路径推荐向导 */
.qc-path-wizard {
    background: var(--qc-white);
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius-lg);
    padding: 28px 32px 32px;
    box-shadow: var(--qc-shadow);
}

.qc-path-progress {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    margin-bottom: 28px;
    padding: 0 8px;
}

.qc-path-progress-item {
    flex: 1;
    max-width: 140px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    position: relative;
    text-align: center;
}

.qc-path-progress-item:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 20px;
    left: calc(50% + 24px);
    width: calc(100% - 48px);
    height: 2px;
    background: var(--qc-border);
    z-index: 0;
}

.qc-path-progress-item.done:not(:last-child)::after {
    background: linear-gradient(90deg, var(--qc-orange), var(--qc-orange-light));
}

.qc-path-progress-num {
    position: relative;
    z-index: 1;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 800;
    background: var(--qc-bg);
    border: 2px solid var(--qc-border);
    color: var(--qc-text-muted);
    transition: all 0.25s;
}

.qc-path-progress-item.active .qc-path-progress-num,
.qc-path-progress-item.done .qc-path-progress-num {
    background: linear-gradient(135deg, var(--qc-orange), var(--qc-orange-dark));
    border-color: transparent;
    color: var(--qc-white);
    box-shadow: 0 4px 14px rgba(255, 107, 44, 0.28);
}

.qc-path-progress-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--qc-text-muted);
    line-height: 1.3;
}

.qc-path-progress-item.active .qc-path-progress-label {
    color: var(--qc-orange-dark);
}

.qc-path-progress-item.done .qc-path-progress-label {
    color: var(--qc-navy);
}

.qc-path-panel {
    background: var(--qc-bg);
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
    padding: 24px;
    margin-bottom: 20px;
}

.qc-path-q {
    font-size: 16px;
    font-weight: 700;
    color: var(--qc-navy);
    margin: 0 0 16px;
}

.qc-path-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.qc-path-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.qc-path-result {
    background: var(--qc-bg);
    border: 1px solid var(--qc-border);
    border-radius: var(--qc-radius);
    border-left: 4px solid var(--qc-orange);
    padding: 24px 28px;
}

.qc-path-result-head h4 {
    margin: 10px 0 0;
    font-size: 22px;
    font-weight: 800;
    color: var(--qc-navy);
}

.qc-path-result-tip {
    margin: 14px 0 20px;
    line-height: 1.75;
    color: var(--qc-text-muted);
    font-size: 15px;
}

.qc-path-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 16px;
}

@media (max-width: 768px) {
    .qc-path-wizard { padding: 20px 16px 24px; }
    .qc-path-progress-item:not(:last-child)::after { display: none; }
    .qc-path-progress { gap: 8px; }
    .qc-path-progress-label { font-size: 12px; }
    .qc-path-actions { justify-content: stretch; }
    .qc-path-actions .qc-btn { flex: 1; }
}