/* Cloud Classroom public site styles */
:root {
  --pure-black: #0b0f18;
  --near-white: #ffffff;
  --light-gray: #f4f6fa;
  --panel-gray: #eef2f7;
  --near-black: #111318;
  --card-black: #171a21;
  --brand-blue: #0a72ff;
  --brand-blue-hover: #2584ff;
  --brand-blue-soft: rgba(10, 114, 255, 0.12);
  --brand-cyan: #67c7ff;
  --success-green: #29b36b;
  --warning-amber: #ffbe5c;
  --text-primary: #151821;
  --text-secondary: rgba(21, 24, 33, 0.78);
  --text-tertiary: rgba(21, 24, 33, 0.48);
  --text-on-dark: #ffffff;
  --text-on-dark-secondary: rgba(255, 255, 255, 0.78);
  --text-on-dark-tertiary: rgba(255, 255, 255, 0.5);
  --line-light: rgba(0, 0, 0, 0.08);
  --line-dark: rgba(255, 255, 255, 0.1);
  --shadow-card: 0 16px 48px rgba(10, 25, 56, 0.12);
  --shadow-deep: 0 20px 64px rgba(0, 0, 0, 0.28);
  --shadow-soft: 0 8px 28px rgba(10, 25, 56, 0.08);
  --max-width: 1240px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background: var(--near-white);
  color: var(--text-primary);
  line-height: 1.6;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; }
img { max-width: 100%; display: block; }
main { display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 32px; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 12, 18, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 24px;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text-on-dark);
  text-decoration: none;
}
.brand-logo {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand-blue), #0f4fb5);
  display: grid;
  place-items: center;
  box-shadow: 0 10px 24px rgba(10, 114, 255, 0.25);
}
.brand-logo svg { width: 18px; height: 18px; }
.brand-name {
  font-size: 19px;
  font-weight: 700;
  white-space: nowrap;
}
.brand-sub {
  color: var(--text-on-dark-tertiary);
  font-size: 12px;
}
nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}
nav a.nav-link {
  color: var(--text-on-dark-secondary);
  text-decoration: none;
  font-size: 14px;
}
nav a.nav-link:hover { color: var(--near-white); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--brand-blue);
  color: var(--near-white);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 10px 22px rgba(10, 114, 255, 0.26);
}
.nav-cta:hover { background: var(--brand-blue-hover); }

.hero {
  background:
    radial-gradient(circle at 15% 18%, rgba(10, 114, 255, 0.2), transparent 34%),
    radial-gradient(circle at 84% 24%, rgba(103, 199, 255, 0.16), transparent 30%),
    linear-gradient(180deg, #0b0f18 0%, #101624 50%, #0b0e15 100%);
  color: var(--text-on-dark);
  padding: 72px 0 32px;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(440px, 0.98fr);
  gap: 40px;
  align-items: center;
}
.hero-copy { max-width: 620px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--brand-cyan);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand-cyan);
  box-shadow: 0 0 0 4px rgba(103, 199, 255, 0.12);
}
.hero h1 {
  font-size: clamp(40px, 5vw, 68px);
  line-height: 1.04;
  font-weight: 700;
  margin-bottom: 18px;
}
.hero h1 .accent { color: var(--brand-cyan); }
.hero .lead {
  font-size: clamp(18px, 2vw, 22px);
  color: var(--text-on-dark-secondary);
  margin-bottom: 28px;
}
.hero-points {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 16px;
  margin-bottom: 30px;
}
.hero-points li {
  list-style: none;
  color: var(--text-on-dark-secondary);
  font-size: 15px;
  padding-left: 18px;
  position: relative;
}
.hero-points li::before,
.list-points li::before,
.platform-list li::before,
.benefit-list li::before,
.doc-list li::before,
.download-list li::before,
.faq-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand-blue);
}
.hero-ctas,
.cta-row {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.hero-ctas { margin-bottom: 22px; }
.btn-primary,
.btn-secondary,
.btn-link {
  border: none;
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  border-radius: 999px;
  padding: 13px 24px;
  cursor: pointer;
  min-height: 46px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-primary {
  background: var(--brand-blue);
  color: var(--near-white);
  box-shadow: 0 10px 22px rgba(10, 114, 255, 0.26);
}
.btn-primary:hover { background: var(--brand-blue-hover); }
.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-on-dark);
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.btn-link {
  background: var(--near-white);
  color: var(--brand-blue);
  border: 1px solid rgba(10, 114, 255, 0.12);
}
.hero-note,
.caption-note {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.58);
}
.hero-visual {
  position: relative;
  padding: 14px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.03));
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: var(--shadow-deep);
}
.panel-shell {
  border-radius: 18px;
  overflow: hidden;
  background: #0e121b;
  border: 1px solid rgba(255,255,255,0.08);
}
.panel-topbar,
.ui-header,
.shot-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.panel-topbar {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.72);
  font-size: 13px;
}
.panel-actions { display: flex; gap: 8px; }
.panel-actions span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
}
.panel-body { padding: 18px; display: grid; gap: 16px; }
.hero-stats,
.trust-strip,
.download-grid,
.docs-grid {
  display: grid;
  gap: 12px;
}
.hero-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.trust-strip {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 18px;
}
.trust-card,
.hero-stat {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 14px;
}
.trust-card .value,
.hero-stat .value {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 6px;
}
.trust-card .label,
.hero-stat .label {
  color: var(--text-on-dark-secondary);
  font-size: 13px;
}
.trust-footnote {
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
  margin-top: 8px;
}
.teacher-shot,
.ui-mock {
  background: linear-gradient(180deg, #111826 0%, #0d131d 100%);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 16px;
}
.teacher-shot { padding: 16px; }
.teacher-shot-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: rgba(255,255,255,0.86);
  margin-bottom: 14px;
  gap: 16px;
}
.teacher-shot-header strong { font-size: 16px; }
.teacher-shot-header span,
.ui-header,
.ui-footer-note,
.shot-top span { font-size: 12px; color: rgba(255,255,255,0.58); }
.teacher-chip-row,
.ui-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.teacher-chip,
.ui-toolbar span {
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.78);
  font-size: 12px;
}
.ui-toolbar span.primary { background: rgba(10,114,255,0.22); color: #d9ecff; }
.teacher-grid {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 6px;
  margin-bottom: 16px;
}
.teacher-grid span {
  aspect-ratio: 1;
  border-radius: 4px;
  background: rgba(255,255,255,0.1);
}
.teacher-grid span.active { background: var(--brand-blue); box-shadow: 0 0 10px rgba(10,114,255,0.34); }
.teacher-grid span.ready { background: rgba(103, 199, 255, 0.8); }
.teacher-grid span.warn { background: rgba(255, 190, 92, 0.9); }
.teacher-grid span.off { background: rgba(255,255,255,0.16); }
.teacher-footer {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.teacher-footer .mini,
.ui-status-strip .box,
.faq-item,
.download-card,
.docs-card,
.summary-card,
.scene-card {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  padding: 12px;
}
.teacher-footer .mini strong,
.ui-status-strip .box strong {
  display: block;
  color: var(--text-on-dark);
  font-size: 22px;
  margin-bottom: 4px;
}
.teacher-footer .mini span,
.ui-status-strip .box span { color: rgba(255,255,255,0.58); font-size: 12px; }
.ui-mock { overflow: hidden; color: var(--text-on-dark); }
.ui-header {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.ui-toolbar { padding: 14px; border-bottom: 1px solid rgba(255,255,255,0.08); margin-bottom: 0; }
.ui-status-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  padding: 14px;
}
.ui-table { padding: 0 14px 14px; }
.ui-row {
  display: grid;
  grid-template-columns: 0.8fr 1fr 1fr 1fr 0.9fr;
  gap: 8px;
  padding: 10px 0;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 12px;
  color: rgba(255,255,255,0.76);
}
.ui-row.header {
  color: rgba(255,255,255,0.42);
  border-top: none;
  padding-top: 14px;
}
.ui-row .ok { color: #83ffba; }
.ui-row .warn { color: #ffd36d; }
.ui-row .blue { color: #8fd1ff; }
.ui-footer-note {
  padding: 14px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
section { padding: 96px 0; }
.section-dark { background: #0d1118; color: var(--text-on-dark); }
.section-light { background: var(--light-gray); }
.section-white { background: var(--near-white); }
.section-heading {
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.08;
  font-weight: 700;
  text-align: center;
  margin-bottom: 14px;
}
.section-sub {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 18px;
}
.section-dark .section-sub { color: var(--text-on-dark-secondary); }
.audience-strip,
.feature-grid,
.flow-grid,
.gallery-grid,
.platform-grid,
.summary-grid,
.scene-grid {
  display: grid;
  gap: 18px;
}
.audience-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.flow-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.gallery-grid { grid-template-columns: 1fr 1fr; }
.platform-grid { grid-template-columns: 1.05fr 0.95fr; gap: 24px; }
.summary-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.scene-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.audience-card,
.feature-card,
.flow-card,
.shot-card,
.compare-table,
.download-card,
.docs-card,
.summary-card,
.scene-card {
  background: var(--near-white);
  border: 1px solid var(--line-light);
  box-shadow: var(--shadow-card);
}
.audience-card,
.feature-card,
.flow-card,
.summary-card,
.scene-card { border-radius: 18px; padding: 24px; }
.audience-card h3,
.flow-card h3,
.download-card h3,
.docs-card h3,
.scene-card h3 { font-size: 22px; margin-bottom: 12px; }
.audience-card p,
.flow-card p,
.download-card p,
.docs-card p,
.scene-card p,
.summary-card p { color: var(--text-secondary); font-size: 15px; }
.feature-card {
  min-height: 220px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.feature-card .tag {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 700;
  color: var(--brand-blue);
  background: var(--brand-blue-soft);
  padding: 6px 10px;
  border-radius: 999px;
}
.feature-card h3 { font-size: 24px; line-height: 1.2; }
.feature-card p { color: var(--text-secondary); font-size: 16px; }
.feature-card .line {
  margin-top: auto;
  border-top: 1px solid var(--line-light);
  padding-top: 12px;
  color: var(--text-tertiary);
  font-size: 13px;
}
.flow-card .step {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--near-black);
  color: var(--near-white);
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
}
.flow-card .mini-note { color: var(--brand-blue); font-size: 13px; font-weight: 600; }
.gallery-main,
.gallery-side { display: grid; gap: 18px; }
.shot-card { border-radius: 18px; overflow: hidden; }
.shot-top {
  padding: 14px 18px;
  background: #f8fafc;
  border-bottom: 1px solid var(--line-light);
}
.shot-top strong { font-size: 16px; }
.shot-top span { color: var(--text-tertiary); }
.shot-body { padding: 18px; }
.shot-caption {
  padding-top: 14px;
  color: var(--text-secondary);
  font-size: 15px;
}
.platform-panel,
.benefit-panel,
.faq-panel {
  border-radius: 20px;
  padding: 28px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.04);
}
.platform-panel h3,
.benefit-panel h3,
.faq-panel h3 {
  font-size: 28px;
  margin-bottom: 14px;
}
.platform-panel p,
.benefit-panel p,
.faq-panel p {
  color: var(--text-on-dark-secondary);
  font-size: 16px;
  margin-bottom: 18px;
}
.platform-list,
.benefit-list,
.doc-list,
.download-list,
.faq-list,
.list-points {
  display: grid;
  gap: 12px;
}
.platform-list li,
.benefit-list li,
.doc-list li,
.download-list li,
.faq-list li,
.list-points li {
  list-style: none;
  padding-left: 18px;
  position: relative;
}
.mid-cta,
.bottom-cta {
  text-align: center;
  border-radius: 22px;
  color: var(--text-on-dark);
  box-shadow: var(--shadow-deep);
}
.mid-cta {
  padding: 28px 24px;
  background: linear-gradient(135deg, #0f1830 0%, #182a4c 100%);
}
.bottom-cta {
  padding: 34px 24px;
  background: linear-gradient(135deg, #111826 0%, #17243c 100%);
}
.mid-cta h3,
.bottom-cta h3 {
  font-size: clamp(28px, 3vw, 40px);
  margin-bottom: 12px;
}
.mid-cta p,
.bottom-cta p {
  max-width: 760px;
  margin: 0 auto 22px;
  color: var(--text-on-dark-secondary);
  font-size: 17px;
}
.compare-table {
  border-radius: 20px;
  overflow: hidden;
}
.compare-row {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1fr;
  gap: 12px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line-light);
  align-items: center;
}
.compare-row:last-child { border-bottom: none; }
.compare-row.header {
  background: #12161f;
  color: var(--text-on-dark);
  font-weight: 700;
}
.compare-row.highlight { background: rgba(10,114,255,0.04); }
.compare-row .ours { color: var(--brand-blue); font-weight: 700; }
.compare-cell.price { font-size: 24px; font-weight: 700; }
.compare-caption,
.download-caption,
.docs-caption {
  color: var(--text-tertiary);
  font-size: 13px;
  margin-top: 12px;
}
.faq-wrap {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 24px;
}
.faq-item {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
}
.faq-item strong {
  display: block;
  color: var(--text-on-dark);
  margin-bottom: 8px;
  font-size: 16px;
}
.faq-item p { color: var(--text-on-dark-secondary); font-size: 14px; }
.download-grid,
.docs-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.download-card,
.docs-card {
  border-radius: 18px;
  padding: 24px;
}
.download-card .meta,
.docs-card .meta {
  color: var(--text-tertiary);
  font-size: 13px;
  margin-bottom: 10px;
}
.download-card .action,
.docs-card .action {
  margin-top: 18px;
  display: inline-flex;
  color: var(--brand-blue);
  font-weight: 600;
  text-decoration: none;
}
.summary-card strong,
.scene-card strong {
  display: block;
  font-size: 14px;
  color: var(--brand-blue);
  margin-bottom: 10px;
}
.footer-note {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255,255,255,0.68);
}
footer {
  background: #0b0d12;
  color: var(--text-on-dark-secondary);
  padding: 46px 0 28px;
}
footer .container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 28px;
}
footer h4 {
  color: var(--text-on-dark);
  font-size: 17px;
  margin-bottom: 12px;
}
footer a {
  color: var(--text-on-dark-secondary);
  text-decoration: none;
  display: block;
  padding: 4px 0;
  font-size: 14px;
}
footer a:hover { color: var(--near-white); }
.footer-bottom {
  text-align: center;
  padding-top: 22px;
  margin-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 12px;
  color: rgba(255,255,255,0.42);
}
.page-hero {
  background: linear-gradient(180deg, #0b0f18 0%, #101624 100%);
  color: var(--text-on-dark);
  padding: 80px 0 48px;
}
.page-hero .container {
  display: grid;
  gap: 20px;
}
.page-hero h1 {
  font-size: clamp(38px, 5vw, 62px);
  line-height: 1.08;
}
.page-hero p {
  max-width: 760px;
  color: var(--text-on-dark-secondary);
  font-size: 18px;
}
.page-hero .subnav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.page-hero .subnav a {
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  color: var(--text-on-dark-secondary);
  text-decoration: none;
  font-size: 13px;
}
.page-hero .subnav a:hover { color: var(--near-white); }
.callout-bar {
  margin-top: 24px;
  padding: 14px 18px;
  border-radius: 14px;
  background: rgba(10, 114, 255, 0.12);
  color: var(--text-primary);
  border: 1px solid rgba(10, 114, 255, 0.1);
}
.callout-bar strong { color: var(--brand-blue); }
@media (max-width: 1080px) {
  .hero-grid,
  .platform-grid,
  .faq-wrap,
  .gallery-grid { grid-template-columns: 1fr; }
}
@media (max-width: 980px) {
  .audience-strip,
  .summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-grid,
  .download-grid,
  .docs-grid,
  .scene-grid { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  nav ul { display: none; }
  .flow-grid { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  footer .container { grid-template-columns: 1fr; }
}
@media (max-width: 820px) {
  .compare-row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 18px;
  }
  .compare-row.header { display: none; }
}
@media (max-width: 768px) {
  .container { padding: 0 18px; }
  .trust-strip,
  .hero-stats,
  .teacher-footer,
  .ui-status-strip { grid-template-columns: 1fr; }
  .hero-points,
  .scene-grid,
  .audience-strip,
  .summary-grid { grid-template-columns: 1fr; }
  .nav-actions { display: none; }
}

/* === Card hover & transitions (Apple-style tactile) === */
.audience-card,
.feature-card,
.flow-card,
.shot-card,
.summary-card,
.scene-card,
.download-card,
.docs-card {
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}
.audience-card:hover,
.feature-card:hover,
.flow-card:hover,
.summary-card:hover,
.scene-card:hover,
.download-card:hover,
.docs-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 64px rgba(10, 25, 56, 0.16);
}

/* === Scroll entrance animation === */
@media (prefers-reduced-motion: no-preference) {
  .section-heading,
  .section-sub,
  .audience-card,
  .feature-card,
  .flow-card,
  .shot-card,
  .summary-card,
  .scene-card,
  .download-card,
  .docs-card,
  .compare-table,
  .mid-cta,
  .bottom-cta,
  .faq-panel {
    opacity: 0;
    transform: translateY(24px);
    animation: cc-fade-up 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  }
  .section-heading { animation-delay: 0.05s; }
  .section-sub { animation-delay: 0.12s; }
  .audience-card:nth-child(1) { animation-delay: 0.15s; }
  .audience-card:nth-child(2) { animation-delay: 0.22s; }
  .audience-card:nth-child(3) { animation-delay: 0.29s; }
  .audience-card:nth-child(4) { animation-delay: 0.36s; }
  .feature-card:nth-child(1) { animation-delay: 0.15s; }
  .feature-card:nth-child(2) { animation-delay: 0.22s; }
  .feature-card:nth-child(3) { animation-delay: 0.29s; }
  .feature-card:nth-child(4) { animation-delay: 0.36s; }
  .flow-card:nth-child(1) { animation-delay: 0.15s; }
  .flow-card:nth-child(2) { animation-delay: 0.25s; }
  .flow-card:nth-child(3) { animation-delay: 0.35s; }

  @keyframes cc-fade-up {
    to { opacity: 1; transform: translateY(0); }
  }
}

/* === Floating contact button (conversion booster) === */
.float-cta {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 50;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: 999px;
  background: var(--brand-blue);
  color: var(--near-white);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 12px 32px rgba(10, 114, 255, 0.32);
  transition: transform 0.2s, box-shadow 0.2s;
}
.float-cta:hover {
  transform: scale(1.04);
  box-shadow: 0 16px 40px rgba(10, 114, 255, 0.4);
}
@media (max-width: 768px) {
  .float-cta { right: 14px; bottom: 14px; padding: 12px 18px; font-size: 14px; }
}
@media (max-width: 640px) {
  .teacher-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .ui-row { grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* === Wiki / Docs layout === */
.wiki-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 0;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}
.wiki-sidebar {
  position: sticky;
  top: 68px;
  align-self: start;
  max-height: calc(100vh - 68px);
  overflow-y: auto;
  padding: 32px 24px 32px 0;
  border-right: 1px solid var(--line-light);
}
.wiki-sidebar h5 {
  font-size: 11px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 22px 0 8px;
  padding-left: 12px;
}
.wiki-sidebar h5:first-child { margin-top: 0; }
.wiki-nav { list-style: none; display: grid; gap: 2px; }
.wiki-nav a {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: background 0.15s, color 0.15s;
}
.wiki-nav a:hover { background: var(--brand-blue-soft); color: var(--brand-blue); }
.wiki-nav a.active { background: var(--brand-blue-soft); color: var(--brand-blue); font-weight: 600; }
.wiki-content {
  padding: 32px 0 64px 40px;
  min-width: 0;
}
.wiki-content h1 {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.15;
}
.wiki-content .wiki-meta {
  color: var(--text-tertiary);
  font-size: 13px;
  margin-bottom: 32px;
}
.wiki-content h2 {
  font-size: 26px;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-light);
}
.wiki-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 28px 0 12px;
}
.wiki-content p {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 16px;
}
.wiki-content ul, .wiki-content ol {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 16px;
  padding-left: 24px;
}
.wiki-content li { margin-bottom: 6px; }
.wiki-content code {
  background: var(--panel-gray);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: "JetBrains Mono", "SF Mono", "Consolas", monospace;
}
.wiki-content pre {
  background: var(--near-black);
  color: #e4e7ec;
  padding: 18px 20px;
  border-radius: 12px;
  overflow-x: auto;
  margin-bottom: 20px;
}
.wiki-content pre code { background: none; padding: 0; }
.wiki-content blockquote {
  border-left: 3px solid var(--brand-blue);
  padding: 12px 18px;
  margin: 0 0 20px;
  background: var(--brand-blue-soft);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
}
.wiki-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 14px;
}
.wiki-content th, .wiki-content td {
  padding: 10px 14px;
  border: 1px solid var(--line-light);
  text-align: left;
}
.wiki-content th { background: var(--panel-gray); font-weight: 600; }
.wiki-callout {
  padding: 16px 20px;
  border-radius: 12px;
  margin-bottom: 20px;
  border: 1px solid;
}
.wiki-callout.info { background: rgba(10, 114, 255, 0.06); border-color: rgba(10, 114, 255, 0.15); }
.wiki-callout.warn { background: rgba(255, 190, 92, 0.08); border-color: rgba(255, 190, 92, 0.2); }
.wiki-callout.danger { background: rgba(229, 72, 72, 0.06); border-color: rgba(229, 72, 72, 0.15); }
.wiki-callout strong { display: block; margin-bottom: 6px; }
.wiki-callout.info strong { color: var(--brand-blue); }
.wiki-callout.warn strong { color: #c47d10; }
.wiki-callout.danger strong { color: #e54848; }

.wiki-nav-bottom {
  display: flex;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line-light);
  gap: 16px;
}
.wiki-nav-bottom a {
  padding: 12px 18px;
  border-radius: 10px;
  border: 1px solid var(--line-light);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  transition: border-color 0.15s, color 0.15s;
}
.wiki-nav-bottom a:hover { border-color: var(--brand-blue); color: var(--brand-blue); }
.wiki-nav-bottom a span { display: block; font-size: 12px; color: var(--text-tertiary); margin-bottom: 4px; }

@media (max-width: 900px) {
  .wiki-layout { grid-template-columns: 1fr; padding: 0 18px; }
  .wiki-sidebar {
    position: static;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--line-light);
    padding: 20px 0;
  }
  .wiki-content { padding: 24px 0 48px 0; }
}

/* === Download page (utility) === */
.dl-section { padding: 48px 0; }
.dl-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0;
  font-size: 15px;
}
.dl-table th, .dl-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-light);
  text-align: left;
}
.dl-table th {
  background: var(--near-black);
  color: var(--text-on-dark);
  font-weight: 600;
  font-size: 13px;
}
.dl-table td strong { font-size: 16px; }
.dl-table .dl-size { color: var(--text-tertiary); font-size: 13px; }
.dl-table .dl-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--brand-blue);
  color: var(--near-white);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.dl-table .dl-action:hover { background: var(--brand-blue-hover); }
.dl-table .dl-action.secondary {
  background: var(--panel-gray);
  color: var(--text-primary);
}
.dl-table .dl-action-disabled {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  background: var(--light-gray);
  color: var(--text-tertiary);
  cursor: not-allowed;
  white-space: nowrap;
}
.dl-badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-left: 8px;
}
.dl-badge.new { background: rgba(41, 179, 107, 0.12); color: var(--success-green); }
.dl-badge.beta { background: rgba(10, 114, 255, 0.12); color: var(--brand-blue); }
.dl-card {
  background: var(--near-white);
  border: 1px solid var(--line-light);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow-soft);
}
.dl-card h3 { font-size: 20px; margin-bottom: 10px; }
.dl-card p { color: var(--text-secondary); font-size: 15px; margin-bottom: 16px; }
.dl-card .dl-meta {
  display: flex;
  gap: 16px;
  color: var(--text-tertiary);
  font-size: 13px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.dl-card .dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  background: var(--brand-blue);
  color: var(--near-white);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
}
.dl-card .dl-btn:hover { background: var(--brand-blue-hover); }

/* === Screenshot container (unified style) === */

/* === Trust section (taste-skill compliant) === */

/* === Feature showcase (zigzag layout, taste-skill 9.C) === */
.feature-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}
.feature-showcase:last-child { margin-bottom: 0; }
.feature-showcase.reverse .feature-text { order: 2; }
.feature-showcase.reverse .feature-img { order: 1; }
.feature-num {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--brand-blue);
  background: var(--brand-blue-soft);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  text-align: center;
  line-height: 36px;
  margin-bottom: 16px;
}
.feature-text h3 {
  font-size: clamp(22px, 2.5vw, 30px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}
.feature-text p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 12px;
}
.feature-img {
  position: relative;
}
.feature-img img {
  width: 100%;
  border-radius: 14px;
  box-shadow: 0 16px 48px rgba(10, 25, 56, 0.14);
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.feature-img img:hover { transform: scale(1.02); }
@media (max-width: 900px) {
  .feature-showcase {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 56px;
  }
  .feature-showcase.reverse .feature-text { order: 0; }
  .feature-showcase.reverse .feature-img { order: 0; }
}

.trust-hero-quote {
  text-align: center;
  margin-bottom: 48px;
}
.trust-big-quote {
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-primary);
  max-width: 760px;
  margin: 0 auto 14px;
  letter-spacing: -0.01em;
}
.trust-big-attribution {
  font-size: 15px;
  color: var(--brand-blue);
  font-weight: 600;
}
.trust-asymmetric {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 40px;
}
@media (max-width: 768px) {
  .trust-asymmetric { grid-template-columns: 1fr; }
}
.trust-side-quote {
  padding: 24px 28px;
  border-left: 3px solid var(--brand-blue);
  background: var(--light-gray);
  border-radius: 0 12px 12px 0;
}
.trust-side-quote:nth-child(2) {
  border-left-color: var(--brand-cyan);
  margin-top: 20px;
}
.trust-quote-text {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 10px;
}
.trust-quote-attr {
  font-size: 13px;
  color: var(--text-tertiary);
}
.trust-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.trust-badge {
  padding: 7px 14px;
  border-radius: 6px;
  background: var(--panel-gray);
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}
.trust-footnote {
  text-align: center;
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-tertiary);
}

.shot-card img,
.hero-visual img {
  border-radius: 10px;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.shot-card img:hover {
  transform: scale(1.02);
}

/* === Lightbox === */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.88);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 32px;
  cursor: zoom-out;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 92vw;
  max-height: 88vh;
  border-radius: 12px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 28px;
  cursor: pointer;
  user-select: none;
  line-height: 1;
}
.lightbox-close:hover { color: white; }