/* ==========================================================================
   备课箱官网 · 主样式表 (css/style.css)
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-ink);
  background-color: var(--color-cream);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 固定品牌标题专用得意黑样式 */
.font-smiley {
  font-family: var(--font-display);
  font-weight: normal;
  letter-spacing: 0.02em;
}

a {
  color: var(--color-brand-green);
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-brand-green);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 9999;
  background: var(--color-deep-green);
  color: #FFFFFF;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.skip-link:focus {
  top: 12px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* 媒体容器：放入真实图片路径即可自动替换 */
.media-slot {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: var(--color-surface);
}
.media-slot img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ==========================================================================
   按钮与通用交互组件（手机触控高度均 >= 44px）
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 11px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background-color: var(--color-brand-green);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background-color: var(--color-brand-green-hover);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-brand-green);
  border: 1.5px solid var(--color-brand-green);
}
.btn-secondary:hover {
  background-color: var(--color-mint);
  color: var(--color-deep-green);
}

.btn-ghost-light {
  background-color: rgba(255, 255, 255, 0.12);
  color: #FFFFFF;
  border: 1.5px solid rgba(255, 255, 255, 0.38);
}
.btn-ghost-light:hover {
  background-color: rgba(255, 255, 255, 0.22);
  color: #FFFFFF;
}

.btn-warm-light {
  background-color: var(--color-warm-yellow);
  color: var(--color-ink);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.btn-warm-light:hover {
  background-color: #FFD042;
  color: var(--color-ink);
}

.badge-free {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-ink);
  background-color: var(--color-warm-yellow);
  border-radius: 999px;
}

/* ==========================================================================
   1. 页头导航 (Header)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(255, 253, 246, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
}

.brand-logo-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 4px 0;
  flex-shrink: 0;
}
.brand-logo-img {
  display: block;
  height: 46px;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 8px 14px;
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
  position: relative;
}
.nav-link:hover {
  color: var(--color-brand-green);
  background-color: rgba(27, 122, 67, 0.06);
}
.nav-link.active {
  color: var(--color-brand-green);
  font-weight: 700;
  background-color: rgba(27, 122, 67, 0.09);
}
.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 5px;
  left: 14px;
  right: 14px;
  height: 2.5px;
  background-color: var(--color-brand-green);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-guest-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 8px 14px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
}
.nav-guest-link:hover {
  color: var(--color-brand-green);
  border-color: var(--color-brand-green);
  background-color: #F6FBF7;
}

.header-cta {
  min-height: 44px;
  padding: 9px 18px;
  font-size: 0.9375rem;
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background-color: var(--color-surface);
  color: var(--color-ink);
}

.mobile-drawer {
  display: none;
  background-color: var(--color-cream);
  border-bottom: 1px solid var(--color-border-strong);
  padding: 16px 24px 24px;
  box-shadow: var(--shadow-md);
}
.mobile-drawer.open {
  display: block;
}
.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.mobile-nav-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 46px;
  padding: 10px 14px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
}
.mobile-nav-list a.active,
.mobile-nav-list a:hover {
  background-color: var(--color-mint);
  color: var(--color-brand-green);
}
.mobile-drawer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   2. 首屏 (Hero Section)
   ========================================================================== */
.hero-section {
  padding: 48px 0 40px;
  background-color: var(--color-cream);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 44px;
  align-items: center;
}

.hero-heading-group {
  display: block;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: normal;
  line-height: 1.65;
  margin: 0;
}

.eyebrow-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--color-kraft-bg);
  border: 1px solid var(--color-kraft-border);
  color: var(--color-amber-deep);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 18px;
}
.eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-amber);
}

.hero-title {
  display: block;
  font-size: clamp(2.15rem, 3.8vw, 3.1rem);
  line-height: 1.24;
  color: var(--color-ink);
  margin-bottom: 18px;
}

.hero-desc {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  max-width: 540px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.hero-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}
.hero-facts li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-ink);
}
.fact-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #FEF3D6;
  color: #9A5B00;
  font-weight: 700;
  flex-shrink: 0;
}

.hero-visual-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.preview-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.preview-window-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 14px;
  background-color: #F6F3E8;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}
.window-dots {
  display: flex;
  gap: 6px;
}
.window-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: #D5CEB8;
}
.window-dots span:nth-child(1) { background-color: #E5A93C; }
.window-dots span:nth-child(2) { background-color: #54A871; }
.window-dots span:nth-child(3) { background-color: #C7C0AA; }

.window-tag {
  font-weight: 600;
  color: var(--color-ink);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-bottom-row {
  display: grid;
  grid-template-columns: 1fr 144px;
  gap: 14px;
  align-items: stretch;
}

.mascot-companion-box {
  position: relative;
  background: linear-gradient(180deg, #FFFDF6 0%, #FFF6DC 100%);
  border: 1.5px solid #ECD69F;
  border-radius: var(--radius-md);
  padding: 8px 8px 8px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  min-height: 168px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.mascot-companion-box:hover {
  border-color: var(--color-amber);
  box-shadow: var(--shadow-md);
}
.mascot-caption {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--color-amber-deep);
  margin-top: 2px;
  line-height: 1.3;
}

/* ==========================================================================
   3. 教材版本入口 (Textbook Versions Section)
   ========================================================================== */
.versions-section {
  padding: 20px 0 64px;
  background: linear-gradient(180deg, var(--color-cream) 0%, #FFFFFF 100%);
}

.versions-panel {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.versions-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.section-title {
  font-size: clamp(1.65rem, 2.6vw, 2.2rem);
  line-height: 1.3;
  color: var(--color-ink);
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-top: 6px;
}

.versions-fallback-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 8px 14px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-amber-deep);
  background-color: var(--color-kraft-bg);
  border: 1px solid var(--color-kraft-border);
  border-radius: var(--radius-sm);
}
.versions-fallback-link:hover {
  background-color: #F9E9C2;
  border-color: var(--color-amber);
  color: #59350A;
}

.versions-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.version-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 132px;
  padding: 18px;
  background-color: var(--color-cream);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-ink);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}
.version-card:hover {
  border-color: var(--color-brand-green);
  background-color: var(--color-surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.version-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 4px 10px;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
}
.badge-jiaoke { background-color: var(--ver-jiaoke-bg); color: var(--ver-jiaoke-text); border: 1px solid var(--ver-jiaoke-border); }
.badge-sujiao { background-color: var(--ver-sujiao-bg); color: var(--ver-sujiao-text); border: 1px solid var(--ver-sujiao-border); }
.badge-yuejiao { background-color: var(--ver-yuejiao-bg); color: var(--ver-yuejiao-text); border: 1px solid var(--ver-yuejiao-border); }
.badge-renjiao { background-color: var(--ver-renjiao-bg); color: var(--ver-renjiao-text); border: 1px solid var(--ver-renjiao-border); }
.badge-daxiang { background-color: var(--ver-daxiang-bg); color: var(--ver-daxiang-text); border: 1px solid var(--ver-daxiang-border); }

.version-publisher {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-bottom: 14px;
}

.version-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.version-updating-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-amber-deep);
  background-color: var(--color-kraft-bg);
  border: 1px solid var(--color-kraft-border);
  border-radius: 999px;
  margin-bottom: 10px;
}

.version-action {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-brand-green);
  padding-top: 10px;
  border-top: 1px dashed var(--color-border);
}

.version-action-updating {
  font-size: 0.8125rem;
  color: var(--color-amber-deep);
}

/* ==========================================================================
   4. 一节课包含什么 + 单元入口 (Resources & Units Section)
   ========================================================================== */
.resources-section {
  padding: 72px 0;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header-block {
  max-width: 680px;
  margin-bottom: 36px;
}

.inside-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.inside-card {
  background-color: var(--color-cream);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.inside-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: #FEF3D6;
  border: 1px solid #F3D999;
  color: #9A5B00;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.inside-card:nth-child(2) .inside-icon {
  background-color: #E6F4EC;
  border-color: #BFE3CE;
  color: #1B7A43;
}
.inside-card:nth-child(3) .inside-icon {
  background-color: #F9EFE2;
  border-color: #E8CFAF;
  color: #8A4F14;
}
.inside-card:nth-child(4) .inside-icon {
  background-color: #E8F1FA;
  border-color: #C2DAF2;
  color: #18528C;
}

.inside-title {
  font-size: 1.35rem;
  color: var(--color-ink);
}

.inside-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.sample-notice-bar {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  background-color: var(--color-kraft-bg);
  border: 1px solid var(--color-kraft-border);
  border-radius: var(--radius-md);
  margin-bottom: 48px;
  font-size: 0.9375rem;
  color: var(--color-ink);
}
.sample-notice-text {
  display: flex;
  align-items: center;
  gap: 6px 10px;
  flex-wrap: wrap;
  flex: 1;
}
.sample-notice-sub {
  color: var(--color-text-secondary);
}

.units-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}
.units-heading {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
}
.units-sub {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.units-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.unit-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-cream);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
  color: var(--color-ink);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.unit-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-brand-green);
}

.unit-cover-slot {
  aspect-ratio: 16 / 9;
  border-bottom: 1px solid var(--color-border);
  background-color: #F4F1E6;
}
.unit-cover-slot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.unit-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
  justify-content: space-between;
  gap: 16px;
}

.unit-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.unit-meta-badge {
  padding: 2px 9px;
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: 6px;
}
.unit-grade {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.unit-name {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.4;
}

.unit-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-brand-green);
}

/* ==========================================================================
   5. 数字实验室 (Digital Lab Section)
   ========================================================================== */
.lab-section {
  padding: 80px 0;
  background-color: var(--color-mint);
  border-bottom: 1px solid var(--color-mint-border);
}

.lab-top-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: end;
  margin-bottom: 36px;
}

.lab-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-mint-border);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-brand-green);
  margin-bottom: 14px;
}

.lab-intro {
  font-size: 1.0625rem;
  color: var(--color-ink);
  line-height: 1.75;
}

.lab-points-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 28px;
}

.lab-point-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}
.lab-point-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.lab-point-desc {
  font-size: 0.96rem;
  color: var(--color-text-secondary);
}

.lab-stage-card {
  background-color: var(--color-surface);
  border: 2px solid #B7DEC0;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  color: var(--color-ink);
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.lab-stage-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 22px;
  background-color: var(--color-deep-green);
  border-bottom: 1px solid #1E4D36;
  color: #FFFFFF;
}

.lab-brand-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  font-size: 0.96rem;
  font-weight: 700;
}
.smartboard-status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: #38D97A;
  box-shadow: 0 0 8px rgba(56, 217, 122, 0.8);
}
.lab-subbrand-pill {
  background-color: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #FFFFFF;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
}
.lab-hardware-tag {
  background-color: rgba(247, 195, 37, 0.2);
  border: 1px solid rgba(247, 195, 37, 0.45);
  color: #FFE58A;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
}

.lab-top-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.lab-autoplay-ctrl,
.lab-theme-ctrl {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #FFFFFF;
  font-size: 0.85rem;
  font-weight: 600;
}
.lab-autoplay-ctrl:hover,
.lab-theme-ctrl:hover {
  background-color: rgba(255, 255, 255, 0.24);
  border-color: rgba(255, 255, 255, 0.45);
}

/* 默认浅色模式下的五步导航条 */
.lab-steps-nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  background-color: #F2F8F3;
  border-bottom: 1px solid var(--color-mint-border);
}

.lab-step-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 56px;
  padding: 12px 10px;
  border-right: 1px solid var(--color-mint-border);
  border-bottom: 3px solid transparent;
  color: var(--color-text-secondary);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.lab-step-btn:last-child {
  border-right: none;
}
.lab-step-btn:hover {
  background-color: #E4F2E6;
  color: var(--color-ink);
}
.lab-step-btn.active {
  background-color: var(--color-surface);
  color: var(--color-brand-green);
  border-bottom-color: var(--color-brand-green);
  font-weight: 700;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  font-size: 0.8125rem;
  font-weight: 700;
  background-color: #D6EBDC;
  color: var(--color-deep-green);
  flex-shrink: 0;
}
.lab-step-btn.active .step-num {
  background-color: var(--color-brand-green);
  color: #FFFFFF;
}
.step-label {
  font-size: 1.05rem;
}

/* 默认浅色模式下的主体与实验画布 */
.lab-stage-body {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 24px;
  padding: 26px;
  align-items: stretch;
  background-color: var(--color-surface);
}

.lab-canvas-box {
  background-color: #F7FBF8;
  border: 1.5px solid var(--color-mint-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 320px;
}

.lab-canvas-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.lab-exp-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.washer-selector {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.washer-btn {
  min-height: 44px;
  padding: 6px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1.5px solid #B7DEC0;
  background-color: var(--color-surface);
  color: var(--color-ink);
}
.washer-btn:hover {
  border-color: var(--color-brand-green);
  color: var(--color-brand-green);
}
.washer-btn.active {
  background-color: var(--color-brand-green);
  color: #FFFFFF;
  border-color: var(--color-brand-green);
  font-weight: 700;
}

.cart-group {
  transition: transform 1.2s cubic-bezier(0.22, 0.8, 0.36, 1);
}
.weight-group {
  transition: transform 1.2s cubic-bezier(0.22, 0.8, 0.36, 1);
}

/* 默认浅色模式下的右侧步骤说明面板（高对比度步骤标签！） */
.lab-info-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: var(--color-cream);
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: 22px;
}

.step-badge-tag {
  display: inline-block;
  padding: 4px 12px;
  background-color: #DCF0E2;
  border: 1px solid #9AD0AC;
  color: #123D2A;
  font-size: 0.84rem;
  font-weight: 700;
  border-radius: 6px;
  margin-bottom: 10px;
}

.step-panel-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.step-panel-desc {
  font-size: 0.96rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.evidence-mini-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 16px;
  color: var(--color-ink);
}
.evidence-mini-table th,
.evidence-mini-table td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}
.evidence-mini-table th {
  background-color: #F4F2E8;
  font-weight: 700;
  color: var(--color-ink);
}
.evidence-mini-table td.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}
.evidence-mini-table tr.highlight-row {
  background-color: #E2F3E6;
  color: #123D2A;
  font-weight: 700;
}

.lab-panel-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.btn-lab-run {
  background-color: var(--color-surface);
  color: var(--color-brand-green);
  border: 1.5px solid var(--color-brand-green);
  min-height: 44px;
  padding: 8px 16px;
  font-size: 0.9rem;
}
.btn-lab-run:hover {
  background-color: var(--color-mint);
  color: var(--color-deep-green);
}

.btn-lab-next {
  background-color: var(--color-brand-green);
  color: #FFFFFF;
  font-weight: 700;
  min-height: 44px;
  padding: 8px 18px;
  font-size: 0.9rem;
}
.btn-lab-next:hover {
  background-color: var(--color-brand-green-hover);
  color: #FFFFFF;
}

.smartboard-chin-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 9px 22px;
  background-color: #EEF6F0;
  border-top: 1px solid var(--color-mint-border);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}
.smartboard-chin-items {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* 实验画布顶部状态横幅与底部说明图注（从 SVG 内置抽离为自适应 HTML 栏，根治手机端缩字与裁切） */
.lab-canvas-status-banner {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 12px;
  background-color: #EAF5E8;
  border: 1px solid #BFE0C6;
  border-radius: 6px;
  color: #123D2A;
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1.45;
}
.lab-banner-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-brand-green);
  flex-shrink: 0;
  margin-top: 5px;
  box-shadow: 0 0 0 3px rgba(27, 122, 67, 0.16);
}
.lab-canvas-caption {
  font-size: 0.78rem;
  line-height: 1.45;
  color: #4F6858;
  padding: 4px 2px 0;
}
.evidence-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 10px;
}

/* SVG 内部元素的默认浅色模式颜色 */
#lab-exp-svg .svg-bg-rect { fill: #FFFFFF; stroke: #CBE4D0; }
#lab-exp-svg .svg-grid-lines { stroke: #EFF6F0; }
#lab-exp-svg .svg-banner-box { fill: #EAF5E8; stroke: #BFE0C6; }
#lab-exp-svg .svg-banner-txt { fill: #123D2A; }
#lab-exp-svg .svg-start-line { stroke: #7A9A86; }
#lab-exp-svg .svg-start-txt { fill: #4F6858; }
#lab-exp-svg .svg-end-line { stroke: #1B7A43; }
#lab-exp-svg .svg-end-txt { fill: #1B7A43; }
#lab-exp-svg .svg-rope { stroke: #1B7A43; }
#lab-exp-svg .svg-timer-box { fill: #F4F9F3; stroke: #BFE0C6; }
#lab-exp-svg .svg-timer-lbl { fill: #4F6858; }
#lab-exp-svg .svg-timer-val { fill: #1B7A43; }
#lab-exp-svg .svg-caption-txt { fill: #4F6858; }

/* ==========================================================================
   切换为「深色大屏模式」(.dark-mode) 时的完整高对比度样式
   ========================================================================== */
.lab-stage-card.dark-mode {
  background-color: #0F261B;
  border: 6px solid #1C3629;
  box-shadow: 0 20px 48px rgba(10, 34, 22, 0.24), 0 0 0 1px rgba(255, 255, 255, 0.08) inset;
  color: #F2F9F4;
}
.lab-stage-card.dark-mode .lab-stage-topbar {
  background-color: #091911;
  border-bottom-color: #214532;
}
.lab-stage-card.dark-mode .lab-steps-nav {
  background-color: #122C1F;
  border-bottom-color: #234B36;
}
.lab-stage-card.dark-mode .lab-step-btn {
  border-right-color: #214532;
  color: #A8C9B5;
}
.lab-stage-card.dark-mode .lab-step-btn:hover {
  background-color: #183A29;
  color: #FFFFFF;
}
.lab-stage-card.dark-mode .lab-step-btn.active {
  background-color: #1B432F;
  color: #FFFFFF;
  border-bottom-color: var(--color-warm-yellow);
}
.lab-stage-card.dark-mode .step-num {
  background-color: #214834;
  color: #C7E3D2;
}
.lab-stage-card.dark-mode .lab-step-btn.active .step-num {
  background-color: var(--color-warm-yellow);
  color: #123D2A;
}
.lab-stage-card.dark-mode .lab-stage-body {
  background: radial-gradient(circle at 25% 20%, #173828 0%, #0F261B 75%);
}
.lab-stage-card.dark-mode .lab-canvas-box {
  background-color: #0A1B12;
  border-color: #27533C;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28) inset;
}
.lab-stage-card.dark-mode .lab-exp-title {
  color: #FFFFFF;
}
.lab-stage-card.dark-mode .lab-canvas-status-banner {
  background-color: #173B2A;
  border-color: #2D6347;
  color: #FFE074;
}
.lab-stage-card.dark-mode .lab-banner-dot {
  background-color: var(--color-warm-yellow);
  box-shadow: 0 0 0 3px rgba(247, 195, 37, 0.24);
}
.lab-stage-card.dark-mode .lab-canvas-caption {
  color: #9EC7B0;
}
.lab-stage-card.dark-mode .washer-btn {
  border-color: #2C5E44;
  background-color: #153324;
  color: #D2ECDC;
}
.lab-stage-card.dark-mode .washer-btn:hover {
  border-color: #48946B;
  color: #FFFFFF;
}
.lab-stage-card.dark-mode .washer-btn.active {
  background-color: var(--color-warm-yellow);
  color: #123D2A;
  border-color: var(--color-warm-yellow);
}
.lab-stage-card.dark-mode .lab-info-panel {
  background-color: #143022;
  border-color: #27533C;
}
.lab-stage-card.dark-mode .step-badge-tag {
  background-color: rgba(247, 195, 37, 0.16);
  border-color: rgba(247, 195, 37, 0.42);
  color: #FFE074;
}
.lab-stage-card.dark-mode .step-panel-title {
  color: #FFFFFF;
}
.lab-stage-card.dark-mode .step-panel-desc {
  color: #C9E4D3;
}
.lab-stage-card.dark-mode .evidence-mini-table {
  background-color: #0D2117;
  border-color: #27533C;
  color: #E2F2E8;
}
.lab-stage-card.dark-mode .evidence-mini-table th,
.lab-stage-card.dark-mode .evidence-mini-table td {
  border-bottom-color: #1E422F;
}
.lab-stage-card.dark-mode .evidence-mini-table th {
  background-color: #183A29;
  color: #A8C9B5;
}
.lab-stage-card.dark-mode .evidence-mini-table tr.highlight-row {
  background-color: rgba(27, 122, 67, 0.55);
  color: #FFE074;
}
.lab-stage-card.dark-mode .lab-panel-actions {
  border-top-color: #254F39;
}
.lab-stage-card.dark-mode .btn-lab-run {
  background-color: #1A3F2D;
  color: #FFFFFF;
  border-color: #3B7A57;
}
.lab-stage-card.dark-mode .btn-lab-run:hover {
  background-color: #23533B;
}
.lab-stage-card.dark-mode .btn-lab-next {
  background-color: var(--color-warm-yellow);
  color: #123D2A;
}
.lab-stage-card.dark-mode .smartboard-chin-bar {
  background-color: #08150E;
  border-top-color: #1E3F2E;
  color: #8FB49E;
}

/* 深色大屏模式下 SVG 内部元素自动切换为黑板高对比配色 */
.lab-stage-card.dark-mode #lab-exp-svg .svg-bg-rect { fill: #0D2218; stroke: #28573F; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-grid-lines { stroke: #163828; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-banner-box { fill: #173B2A; stroke: #2D6347; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-banner-txt { fill: #FFE074; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-gate-pill-start { fill: #153525; stroke: #367052; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-gate-pill-end { fill: #1A422D; stroke: #F7C325; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-start-line { stroke: #80BFA0; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-start-txt { fill: #B8DEC9; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-end-line { stroke: #F7C325; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-end-txt { fill: #F7C325; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-rope { stroke: #F7C325; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-timer-box { fill: #153525; stroke: #367052; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-timer-lbl { fill: #B8DEC9; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-timer-val { fill: #F7C325; }
.lab-stage-card.dark-mode #lab-exp-svg .svg-caption-txt { fill: #9EC7B0; }

.lab-panel-actions-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-lab-real {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 44px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px dashed var(--color-brand-green);
  background-color: #EDF8F0;
  color: var(--color-deep-green);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.18s ease;
}
.btn-lab-real:hover {
  border-style: solid;
  background-color: #DDF2E3;
  color: var(--color-brand-green);
}

.lab-stage-card.dark-mode .btn-lab-real {
  border-color: rgba(247, 195, 37, 0.55);
  background-color: rgba(247, 195, 37, 0.12);
  color: #FFE074;
}
.lab-stage-card.dark-mode .btn-lab-real:hover {
  border-color: var(--color-warm-yellow);
  background-color: rgba(247, 195, 37, 0.22);
  color: #FFFFFF;
}

.lab-bottom-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--color-mint-border);
}

.lab-method-note {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.lab-cta-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ==========================================================================
   6. 常见问题 (FAQ Section)
   ========================================================================== */
.faq-section {
  padding: 76px 0;
  background-color: var(--color-cream);
}

.faq-layout {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 36px;
  align-items: start;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question-btn {
  width: 100%;
  min-height: 56px;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-ink);
  background-color: var(--color-surface);
  transition: background-color 0.18s ease, color 0.18s ease;
}
.faq-question-btn:hover {
  background-color: #F9F7EE;
  color: var(--color-brand-green);
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: #F4EFE4;
  color: var(--color-amber-deep);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}
.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 14px 22px 20px;
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  border-top: 1px dashed var(--color-border);
}
.faq-item.open .faq-answer {
  display: block;
}

.order-retrieve-card {
  background-color: var(--color-kraft-bg);
  border: 1.5px solid var(--color-kraft-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
}
.order-retrieve-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.order-retrieve-desc {
  font-size: 0.96rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* ==========================================================================
   7. 末尾行动区 (Final CTA Section)
   ========================================================================== */
.final-cta-section {
  padding: 68px 0;
  background: linear-gradient(180deg, #FDF6E6 0%, #F7E9C8 100%);
  border-top: 1px solid var(--color-kraft-border);
  border-bottom: 1px solid var(--color-kraft-border);
  color: var(--color-ink);
  text-align: center;
}

.final-cta-inner {
  max-width: 680px;
  margin: 0 auto;
  background-color: rgba(255, 255, 255, 0.78);
  border: 1.5px solid #E8CE97;
  border-radius: var(--radius-lg);
  padding: 44px 32px;
  box-shadow: var(--shadow-md);
}

.final-cta-title {
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  color: var(--color-ink);
  margin-bottom: 12px;
}

.final-cta-desc {
  font-size: 1.0625rem;
  color: var(--color-amber-deep);
  font-weight: 500;
  margin-bottom: 28px;
}

.final-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

/* ==========================================================================
   8. 页脚 (Footer)
   ========================================================================== */
.site-footer {
  padding: 48px 0 36px;
  background-color: #F5F1E3;
  border-top: 1px solid var(--color-border-strong);
  color: var(--color-text-secondary);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 36px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border-strong);
}

.footer-logo-img {
  height: 52px;
  width: auto;
}

.footer-slogan {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-top: 10px;
  margin-bottom: 10px;
}

.footer-bio {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 520px;
}

.footer-nav-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
}

.footer-nav-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(150px, auto));
  gap: 24px 44px;
  width: 100%;
  justify-content: end;
}

.footer-nav-group-title {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-amber-deep);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink);
}
.footer-nav-list a:hover {
  color: var(--color-brand-green);
}

.footer-nav-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.footer-nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--color-ink);
}
.footer-nav-links a:hover {
  color: var(--color-brand-green);
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.footer-filing {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
}
.footer-filing a {
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.footer-filing a:hover {
  color: var(--color-brand-green);
}

/* 数字实验室桌面端紧凑一屏基准布局（置于媒体查询之前，确保移动端规则正确覆盖） */
.lab-section { padding: 48px 0; }
.lab-top-grid { margin-bottom: 18px; }
.lab-points-grid { gap: 14px; margin-bottom: 18px; }
.lab-point-card { padding: 14px 18px; }
.lab-stage-topbar { padding: 10px 18px; }
.lab-autoplay-ctrl, .lab-theme-ctrl { min-height: 36px; padding: 4px 12px; font-size: 0.82rem; }
.lab-step-btn { min-height: 46px; padding: 8px 10px; }
.lab-stage-body { grid-template-columns: 1.25fr 0.75fr; gap: 18px; padding: 16px 20px; align-items: stretch; }
.lab-canvas-box { padding: 14px 16px; min-height: 0; min-width: 0; justify-content: flex-start; gap: 10px; }
.lab-canvas-header { margin-bottom: 2px; flex-wrap: nowrap; }
.lab-exp-title { font-size: 0.94rem; white-space: nowrap; }
.washer-selector { gap: 5px; flex-wrap: nowrap; }
.washer-btn { min-height: 34px; padding: 4px 10px; font-size: 0.8125rem; }
.lab-info-panel { padding: 14px 16px; min-width: 0; }
.step-badge-tag { padding: 3px 10px; font-size: 0.78rem; margin-bottom: 6px; }
.step-panel-title { font-size: 1.08rem; margin-bottom: 6px; line-height: 1.35; }
.step-panel-desc { font-size: 0.875rem; line-height: 1.55; margin-bottom: 10px; }
.evidence-mini-table { font-size: 0.8125rem; margin-bottom: 0; }
.evidence-mini-table th, .evidence-mini-table td { padding: 5px 8px; }
.evidence-mini-table th.num, .evidence-mini-table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.evidence-mini-table td.avg-cell { font-weight: 700; }
.evidence-mini-table.reliability-focus td.diff-cell { background: #FFF3CD; color: #7A4B14; font-weight: 700; text-decoration: underline wavy #D98A00; }
.lab-panel-actions { padding-top: 10px; }
.btn-lab-run, .btn-lab-next { min-height: 38px; padding: 6px 14px; font-size: 0.875rem; }
.smartboard-chin-bar { padding: 7px 18px; }
.lab-bottom-bar { margin-top: 18px; padding-top: 14px; }
.washer-btn:disabled, .btn-lab-run:disabled { opacity: 0.55; cursor: not-allowed; }
.lab-stage-card.dark-mode .evidence-mini-table.reliability-focus td.diff-cell { background: rgba(247,195,37,0.25); color: #FFE58A; }

/* ==========================================================================
   响应式适配（手机端一等公民 · 移动端自适应实验台）
   ========================================================================== */
@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .versions-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .inside-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .units-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .lab-top-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .lab-points-grid {
    grid-template-columns: 1fr;
  }
  .lab-stage-body {
    grid-template-columns: 1fr;
  }
  .faq-layout {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-nav-col {
    align-items: flex-start;
  }
}

@media (max-width: 760px) {
  .container {
    padding: 0 16px;
  }
  .main-nav,
  .header-actions .nav-guest-link {
    display: none;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .header-cta {
    padding: 8px 14px;
    font-size: 0.875rem;
  }
  .hero-section {
    padding: 24px 0 28px;
  }
  .hero-cta-group {
    flex-direction: column;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
  .preview-window-bar {
    padding: 8px 12px;
    gap: 8px;
    font-size: 0.76rem;
  }
  .window-tag {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .window-bar-hint {
    display: none;
  }
  .hero-bottom-row {
    grid-template-columns: 1fr;
  }
  .versions-panel {
    padding: 20px 16px;
  }
  .versions-grid {
    grid-template-columns: 1fr 1fr;
  }
  .inside-grid {
    grid-template-columns: 1fr;
  }
  .sample-notice-bar {
    flex-wrap: wrap;
    padding: 14px 16px;
  }
  .units-grid {
    grid-template-columns: 1fr;
  }

  /* 数字实验室移动端专项重构：消除左宽右窄挤压，打造紧凑一屏手机实验台 */
  .lab-section {
    padding: 36px 0;
  }
  .lab-stage-card,
  .lab-stage-card.dark-mode {
    border-width: 3px;
    border-radius: var(--radius-md);
  }
  .lab-stage-topbar {
    padding: 10px 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .lab-stage-brand {
    width: 100%;
    justify-content: space-between;
    gap: 8px;
  }
  .lab-hardware-tag {
    font-size: 0.72rem;
    padding: 2px 8px;
  }
  .lab-top-controls {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
  }
  .lab-autoplay-ctrl,
  .lab-theme-ctrl {
    width: 100%;
    justify-content: center;
    min-height: 38px;
    padding: 6px 8px;
    font-size: 0.76rem;
    text-align: center;
  }

  /* 五步导航条：手机端改为 5 列紧凑横向步骤胶囊条，节省约 200px 纵向高度 */
  .lab-steps-nav {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .lab-step-btn {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 4px;
    min-height: 54px;
    padding: 6px 2px;
    border-right: 1px solid var(--color-mint-border);
    border-bottom: 3px solid transparent;
    text-align: center;
  }
  .lab-step-btn:last-child {
    border-right: none;
  }
  .lab-stage-card.dark-mode .lab-step-btn {
    border-right-color: #214532;
  }
  .step-num {
    width: 20px;
    height: 20px;
    font-size: 0.72rem;
  }
  .step-label {
    font-size: 0.73rem;
    line-height: 1.2;
    white-space: nowrap;
  }

  /* 实验舞台上下单栏堆叠，100% 宽度释放给 2.5D 轨道画布与证据表 */
  .lab-stage-body {
    grid-template-columns: 1fr;
    padding: 12px;
    gap: 12px;
  }
  .lab-canvas-box {
    padding: 12px;
    gap: 10px;
  }
  .lab-canvas-header {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    flex-wrap: wrap;
  }
  .lab-exp-title {
    font-size: 0.88rem;
    white-space: normal;
    line-height: 1.4;
  }
  .washer-selector {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    width: 100%;
  }
  .washer-btn {
    min-height: 40px;
    padding: 6px 4px;
    font-size: 0.78rem;
    justify-content: center;
    text-align: center;
  }
  .lab-canvas-status-banner {
    padding: 7px 10px;
    font-size: 0.79rem;
  }
  .lab-canvas-caption {
    font-size: 0.74rem;
  }
  .lab-info-panel {
    padding: 14px 12px;
  }
  .step-panel-title {
    font-size: 1rem;
  }
  .step-panel-desc {
    font-size: 0.84rem;
    line-height: 1.55;
  }
  .evidence-mini-table {
    font-size: 0.76rem;
  }
  .evidence-mini-table th,
  .evidence-mini-table td {
    padding: 6px 5px;
    white-space: nowrap;
  }
  .lab-panel-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .btn-lab-run,
  .btn-lab-next {
    width: 100%;
    justify-content: center;
    min-height: 42px;
    padding: 8px 10px;
    font-size: 0.84rem;
  }
  .smartboard-chin-bar {
    padding: 8px 12px;
    font-size: 0.74rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .smartboard-chin-items {
    gap: 6px 12px;
  }
  .lab-bottom-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .lab-cta-wrap {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    width: 100%;
  }
  .lab-cta-wrap .btn {
    width: 100%;
    justify-content: center;
  }

  .final-cta-inner {
    padding: 32px 20px;
  }
  .final-cta-actions {
    flex-direction: column;
  }
  .final-cta-actions .btn {
    width: 100%;
  }
  .mobile-drawer-actions {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .versions-grid {
    grid-template-columns: 1fr;
  }
  .lab-top-controls {
    grid-template-columns: 1fr;
  }
  .step-label {
    font-size: 0.68rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   9. 备课箱智能宠物「小备」官网融合样式（工位槽 / 投喂交互 / 百宝箱抽屉）
   ========================================================================== */

/* 9.1 首屏右上角小备专属工位槽 (#pet-home-slot) */
.pet-slot-stage {
  width: 112px;
  height: 108px;
  margin: 0 auto;
  flex-shrink: 0;
  border-radius: 12px;
  background: radial-gradient(circle at 50% 62%, rgba(247, 195, 37, 0.22) 0%, rgba(255, 248, 229, 0) 72%);
}

.pet-slot-docked-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  width: 100%;
  z-index: 2;
}

.pet-slot-mini-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 999px;
  background-color: #FFFFFF;
  border: 1px solid #E5CE97;
  color: var(--color-amber-deep);
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.16s ease;
}
.pet-slot-mini-btn:hover {
  background-color: var(--color-brand-green);
  border-color: var(--color-brand-green);
  color: #FFFFFF;
}

/* 当小备脱离首屏小窝伴游全页时显示的召回覆盖层 */
.pet-slot-roaming-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 252, 242, 0.97) 0%, rgba(253, 244, 218, 0.98) 100%);
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px);
  transition: opacity 0.22s ease, transform 0.22s ease;
  z-index: 3;
}

#pet-home-slot.is-pet-roaming .pet-slot-roaming-overlay {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.roaming-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background-color: #E7F5EC;
  border: 1px solid #BFE3CE;
  color: var(--color-brand-green);
  font-size: 0.75rem;
  font-weight: 700;
}

.roaming-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-brand-green);
  box-shadow: 0 0 0 3px rgba(27, 122, 67, 0.2);
}

.roaming-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
}

.roaming-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 100%;
  min-height: 32px;
  padding: 5px 8px;
  border-radius: 8px;
  border: 1px solid #DFC994;
  background-color: #FFFFFF;
  color: var(--color-ink);
  font-size: 0.76rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.16s ease;
}
.roaming-btn:hover {
  border-color: var(--color-brand-green);
  color: var(--color-brand-green);
  background-color: #F4FBF6;
}
.roaming-btn-primary {
  background-color: var(--color-brand-green);
  border-color: var(--color-brand-green);
  color: #FFFFFF;
}
.roaming-btn-primary:hover {
  background-color: var(--color-brand-green-hover);
  color: #FFFFFF;
}

/* 9.2 小备百宝箱双分页浮层抽屉 (#xiaobei-toolbox-drawer) */
.xb-toolbox-drawer {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 410px;
  max-width: calc(100vw - 32px);
  max-height: min(620px, calc(100vh - 96px));
  background-color: var(--color-surface);
  border: 2px solid var(--color-deep-green, #1A2E24);
  border-radius: 18px;
  box-shadow: 0 20px 48px rgba(18, 42, 29, 0.22), 0 4px 12px rgba(18, 42, 29, 0.1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 9998;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(18px) scale(0.97);
  transition: opacity 0.22s ease, transform 0.24s cubic-bezier(0.22, 1, 0.36, 1), visibility 0.22s ease;
}

.xb-toolbox-drawer.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.xb-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 16px;
  background: linear-gradient(135deg, #FFF8E5 0%, #EDF7F0 100%);
  border-bottom: 1px solid var(--color-border-strong);
}

.xb-drawer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.xb-brand-avatar {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background-color: #FFFFFF;
  border: 1.5px solid #E5CE97;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-xs);
}

.xb-drawer-title {
  font-family: var(--font-sans);
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--color-ink);
  line-height: 1.2;
}

.xb-drawer-subtitle {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.xb-drawer-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.xb-mode-switch-btn {
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--color-border-strong);
  background-color: #FFFFFF;
  color: var(--color-ink);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.16s ease;
}
.xb-mode-switch-btn:hover {
  border-color: var(--color-brand-green);
  color: var(--color-brand-green);
}

.xb-drawer-close-btn {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background-color: #FFFFFF;
  color: var(--color-text-secondary);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.xb-drawer-close-btn:hover {
  background-color: #FDECEC;
  border-color: #F3B7B7;
  color: #C03535;
}

.xb-drawer-tabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  background-color: #F7F4EB;
  border-bottom: 1px solid var(--color-border);
  padding: 4px 6px;
  gap: 4px;
}

.xb-tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-height: 36px;
  padding: 6px 8px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}
.xb-tab-btn:hover {
  color: var(--color-ink);
  background-color: rgba(255, 255, 255, 0.6);
}
.xb-tab-btn.active {
  background-color: #FFFFFF;
  color: var(--color-brand-green);
  box-shadow: 0 1px 4px rgba(26, 46, 36, 0.08);
}

.xb-drawer-body {
  padding: 14px 16px 16px;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.xb-tab-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.xb-tab-panel[hidden] {
  display: none !important;
}

/* 分页 1：课堂小工具 */
.xb-tool-card {
  background-color: var(--color-cream);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px;
}

.xb-tool-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.xb-tool-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
}

.xb-timer-presets,
.xb-picker-modes {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.xb-preset-pill {
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--color-border-strong);
  background-color: #FFFFFF;
  color: var(--color-text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
}
.xb-preset-pill.active,
.xb-preset-pill:hover {
  background-color: var(--color-brand-green);
  border-color: var(--color-brand-green);
  color: #FFFFFF;
}

.xb-timer-stage,
.xb-picker-stage {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 10px 12px;
}

.xb-timer-readout {
  font-family: var(--font-sans);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-brand-green);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}
.xb-timer-readout.is-urgent {
  color: #D9534F;
}

.xb-timer-controls {
  display: flex;
  gap: 6px;
}

.xb-tool-btn {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--color-border-strong);
  background-color: #FFFFFF;
  color: var(--color-ink);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}
.xb-tool-btn:hover {
  border-color: var(--color-brand-green);
  color: var(--color-brand-green);
}
.xb-tool-btn-primary {
  background-color: var(--color-brand-green);
  border-color: var(--color-brand-green);
  color: #FFFFFF;
}
.xb-tool-btn-primary:hover {
  background-color: var(--color-brand-green-hover);
  color: #FFFFFF;
}
.xb-tool-btn-amber {
  background-color: #FFF4D4;
  border-color: #E5C168;
  color: #7A4B14;
}
.xb-tool-btn-amber:hover {
  background-color: var(--color-amber);
  border-color: var(--color-amber);
  color: #FFFFFF;
}

.xb-picker-result {
  font-size: 0.96rem;
  font-weight: 800;
  color: var(--color-ink);
}

.xb-link-reset-btn {
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.74rem;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}
.xb-link-reset-btn:hover {
  color: var(--color-brand-green);
}

.xb-stars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.xb-star-group-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 6px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background-color: #FFFFFF;
  cursor: pointer;
  transition: all 0.15s ease;
}
.xb-star-group-btn:hover {
  border-color: var(--color-amber);
  background-color: #FFFBF0;
  transform: translateY(-1px);
}
.xb-group-name {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--color-text-secondary);
}
.xb-group-stars {
  font-size: 0.86rem;
  font-weight: 800;
  color: #B86E00;
}
.xb-star-plus {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--color-brand-green);
}

/* 分页 2：选课与小备状态控制 */
.xb-status-pill {
  padding: 2px 8px;
  border-radius: 999px;
  background-color: #E7F5EC;
  color: var(--color-brand-green);
  font-size: 0.72rem;
  font-weight: 700;
}

.xb-pet-ctrl-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.xb-ctrl-card-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background-color: #FFFFFF;
  color: var(--color-ink);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}
.xb-ctrl-card-btn:hover {
  border-color: var(--color-brand-green);
  color: var(--color-brand-green);
  background-color: #F5FBF7;
}
.xb-ctrl-icon {
  font-size: 1rem;
}

.xb-ver-quick-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.xb-ver-pill {
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  transition: transform 0.15s ease;
}
.xb-ver-pill:hover {
  transform: translateY(-1px);
}

.xb-quick-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.xb-quick-link-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 8px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  color: var(--color-ink);
  font-size: 0.78rem;
  font-weight: 600;
}
.xb-quick-link-item:hover {
  border-color: var(--color-brand-green);
  color: var(--color-brand-green);
}

/* 教室深色大屏模式同步（classroom-theme） */
.xb-toolbox-drawer.classroom-theme {
  background-color: #16261E;
  border-color: #2E5441;
  color: #EAF4EE;
}
.xb-toolbox-drawer.classroom-theme .xb-drawer-header {
  background: linear-gradient(135deg, #1B3327 0%, #12231B 100%);
  border-bottom-color: #294938;
}
.xb-toolbox-drawer.classroom-theme .xb-drawer-title,
.xb-toolbox-drawer.classroom-theme .xb-tool-title,
.xb-toolbox-drawer.classroom-theme .xb-picker-result {
  color: #F3FAF6;
}
.xb-toolbox-drawer.classroom-theme .xb-drawer-subtitle {
  color: #A3C1B0;
}
.xb-toolbox-drawer.classroom-theme .xb-drawer-tabs {
  background-color: #101D16;
  border-bottom-color: #294938;
}
.xb-toolbox-drawer.classroom-theme .xb-tab-btn {
  color: #9BBAA8;
}
.xb-toolbox-drawer.classroom-theme .xb-tab-btn.active {
  background-color: #1F3B2D;
  color: #6EE7A0;
}
.xb-toolbox-drawer.classroom-theme .xb-tool-card {
  background-color: #1C3126;
  border-color: #2C4C3B;
}
.xb-toolbox-drawer.classroom-theme .xb-timer-stage,
.xb-toolbox-drawer.classroom-theme .xb-picker-stage,
.xb-toolbox-drawer.classroom-theme .xb-star-group-btn,
.xb-toolbox-drawer.classroom-theme .xb-ctrl-card-btn,
.xb-toolbox-drawer.classroom-theme .xb-quick-link-item {
  background-color: #13221A;
  border-color: #2C4C3B;
  color: #EAF4EE;
}
.xb-toolbox-drawer.classroom-theme .xb-timer-readout {
  color: #F7C325;
}

@media (max-width: 760px) {
  .mascot-companion-box {
    min-height: 118px;
    flex-direction: row;
    justify-content: space-between;
    padding: 8px 14px;
  }
  .pet-slot-stage {
    width: 88px;
    height: 88px;
    margin: 0;
  }
  .pet-slot-docked-meta {
    align-items: flex-end;
    text-align: right;
  }
  .pet-slot-roaming-overlay {
    flex-direction: row;
    justify-content: space-between;
    padding: 8px 14px;
  }
  .roaming-actions {
    flex-direction: row;
    width: auto;
  }
  .xb-toolbox-drawer {
    right: 8px;
    left: 8px;
    bottom: 8px;
    width: auto;
    max-width: none;
    max-height: 78vh;
  }
}


/* ==========================================================================
   10. 信任合规子页（关于教研组 / 联系我们 / 隐私政策 / 服务条款）与品牌化 404 样式
   ========================================================================== */

.subpage-breadcrumb {
  background-color: #F6F3E8;
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-list li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-list a {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.breadcrumb-list a:hover {
  color: var(--color-brand-green);
}

.breadcrumb-sep {
  color: #B9B2A3;
}

.breadcrumb-current {
  color: var(--color-ink);
  font-weight: 600;
}

.subpage-hero {
  padding: 44px 0 36px;
  background: linear-gradient(180deg, var(--color-cream) 0%, #FFFFFF 100%);
  border-bottom: 1px solid var(--color-border);
}

.subpage-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background-color: var(--color-kraft-bg);
  border: 1px solid var(--color-kraft-border);
  color: var(--color-amber-deep);
  font-size: 0.84rem;
  font-weight: 700;
  border-radius: 999px;
  margin-bottom: 14px;
}

.subpage-title {
  font-family: var(--font-sans);
  font-size: clamp(1.85rem, 3.2vw, 2.55rem);
  font-weight: 800;
  line-height: 1.28;
  color: var(--color-ink);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.subpage-lead {
  font-size: 1.0625rem;
  line-height: 1.78;
  color: var(--color-text-secondary);
  max-width: 780px;
}

.subpage-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.subpage-meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 6px;
  background-color: var(--color-mint);
  border: 1px solid var(--color-mint-border);
  color: var(--color-brand-green);
  font-weight: 600;
  font-size: 0.8125rem;
}

.subpage-content {
  padding: 52px 0 68px;
  background-color: var(--color-cream);
}

.trust-block {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 28px;
}

.trust-block:last-child {
  margin-bottom: 0;
}

.trust-block-accent {
  border-color: #B7DEC0;
  background: linear-gradient(180deg, #FFFFFF 0%, #F7FBF8 100%);
}

.trust-section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 6px;
  background-color: #EAF5EE;
  color: var(--color-brand-green);
  font-size: 0.8125rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.trust-h2 {
  font-family: var(--font-sans);
  font-size: clamp(1.35rem, 2.2vw, 1.7rem);
  font-weight: 800;
  line-height: 1.35;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.trust-desc {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--color-text-secondary);
  margin-bottom: 22px;
}

.trust-desc:last-child {
  margin-bottom: 0;
}

.trust-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.trust-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.trust-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.trust-item-card {
  background-color: var(--color-cream);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.trust-item-card.is-white {
  background-color: var(--color-surface);
  border-color: var(--color-border-strong);
}

.trust-item-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: 6px;
  background-color: var(--color-kraft-bg);
  border: 1px solid var(--color-kraft-border);
  color: var(--color-amber-deep);
  font-size: 0.78rem;
  font-weight: 700;
}

.trust-item-title {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.4;
}

.trust-item-text {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.trust-highlight-box {
  background-color: var(--color-kraft-bg);
  border: 1px solid var(--color-kraft-border);
  border-left: 4px solid var(--color-amber);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin: 18px 0;
  color: var(--color-ink);
}

.trust-highlight-box.is-green {
  background-color: var(--color-mint);
  border-color: var(--color-mint-border);
  border-left: 4px solid var(--color-brand-green);
}

.trust-highlight-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.trust-highlight-text {
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--color-ink);
}

/* 法律与合规条款正文排版 */
.legal-article {
  max-width: 900px;
  margin: 0 auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: 40px 44px;
  box-shadow: var(--shadow-sm);
}

.legal-section {
  padding-bottom: 26px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--color-border);
}

.legal-section:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.legal-section h2 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-ink);
  margin-bottom: 12px;
  line-height: 1.4;
}

.legal-section p {
  font-size: 0.98rem;
  line-height: 1.82;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.legal-section p:last-child {
  margin-bottom: 0;
}

.legal-list {
  padding-left: 20px;
  margin: 10px 0 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--color-text-secondary);
  font-size: 0.96rem;
  line-height: 1.75;
}

.legal-list strong {
  color: var(--color-ink);
}

/* 联系页渠道列表与状态标 */
.channel-status-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
  padding: 14px 18px;
  background-color: var(--color-cream);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.channel-label {
  font-weight: 700;
  color: var(--color-ink);
  font-size: 0.96rem;
}

.channel-value {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.channel-value.is-configured {
  color: var(--color-brand-green);
  font-weight: 700;
}

/* 品牌化 404 页面 */
.notfound-section {
  padding: 64px 0 80px;
  background: linear-gradient(180deg, var(--color-cream) 0%, #F4EFE3 100%);
  min-height: calc(100vh - var(--header-height) - 200px);
  display: flex;
  align-items: center;
}

.notfound-card {
  max-width: 820px;
  margin: 0 auto;
  background-color: var(--color-surface);
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: 44px 36px;
  box-shadow: var(--shadow-md);
  text-align: center;
}

.notfound-mascot {
  width: 116px;
  height: 116px;
  margin: 0 auto 16px;
  display: block;
}

.notfound-code-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  background-color: var(--color-kraft-bg);
  border: 1px solid var(--color-kraft-border);
  color: var(--color-amber-deep);
  font-size: 0.84rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.notfound-title {
  font-family: var(--font-sans);
  font-size: clamp(1.65rem, 2.8vw, 2.2rem);
  font-weight: 800;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.notfound-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 540px;
  margin: 0 auto 30px;
  line-height: 1.75;
}

.notfound-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  text-align: left;
}

.notfound-nav-item {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 8px;
  padding: 18px 20px;
  background-color: var(--color-cream);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-ink);
  transition: border-color 0.18s ease, transform 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.notfound-nav-item:hover {
  border-color: var(--color-brand-green);
  background-color: var(--color-surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  color: var(--color-ink);
}

.notfound-nav-item-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-brand-green);
}

.notfound-nav-item-sub {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

@media (max-width: 980px) {
  .footer-nav-groups {
    justify-content: start;
  }
  .trust-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .trust-grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .subpage-hero {
    padding: 28px 0 24px;
  }
  .subpage-content {
    padding: 32px 0 48px;
  }
  .trust-block {
    padding: 22px 18px;
  }
  .trust-grid-2,
  .trust-grid-4,
  .notfound-nav-grid {
    grid-template-columns: 1fr;
  }
  .legal-article {
    padding: 24px 18px;
  }
  .notfound-card {
    padding: 30px 20px;
  }
  .footer-nav-groups {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px 24px;
  }
}