/* ============================================================
   妙境AI · Components
   ============================================================ */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  line-height: 1;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), box-shadow var(--transition), transform var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 18px; height: 18px; }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover { background: var(--color-primary-hover); }

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover { background: var(--color-slate-50); border-color: var(--color-slate-400); }

.btn-ghost { color: var(--color-text-secondary); }
.btn-ghost:hover { background: var(--color-slate-100); color: var(--color-text); }

.btn-soft {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}
.btn-soft:hover { background: var(--color-primary-100); }

.btn-lg { padding: 0.9rem 1.6rem; font-size: var(--text-base); }
.btn-sm { padding: 0.5rem 0.85rem; font-size: var(--text-xs); }
.btn-block { width: 100%; }
.btn-icon { padding: 0.55rem; }

/* ---------- Badges / Tags ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  line-height: 1.4;
}
.badge-primary { background: var(--color-primary-50); color: var(--color-primary-700); }
.badge-success { background: var(--color-success-bg); color: var(--color-success); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-danger  { background: var(--color-danger-bg); color: var(--color-danger); }
.badge-purple  { background: var(--color-purple-bg); color: var(--color-purple); }
.badge-blue    { background: var(--color-primary-50); color: var(--color-primary-700); }
.badge-green   { background: var(--color-success-bg); color: var(--color-success); }
.badge-orange  { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-red     { background: var(--color-danger-bg); color: var(--color-danger); }
.badge-neutral { background: var(--color-slate-100); color: var(--color-slate-600); }
.badge-dot::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; display: inline-block;
}

.tag {
  display: inline-flex; align-items: center;
  font-size: var(--text-xs); font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  padding: 0.2rem 0.55rem; border-radius: var(--radius-sm);
  background: var(--color-slate-100);
}

/* ---------- Card base ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.card-hover:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--color-slate-300);
}
.card-pad { padding: var(--space-6); }
.card-pad-sm { padding: var(--space-5); }

/* ---------- Avatar ---------- */
.avatar {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: var(--radius-full);
  background: var(--color-primary-100); color: var(--color-primary-700);
  font-weight: var(--font-semibold); font-size: var(--text-sm);
  flex-shrink: 0; overflow: hidden;
}
.avatar-sm { width: 28px; height: 28px; font-size: var(--text-xs); }
.avatar-lg { width: 48px; height: 48px; font-size: var(--text-lg); }
.avatar-stack { display: flex; }
.avatar-stack .avatar { margin-left: -10px; border: 2px solid var(--color-surface); }
.avatar-stack .avatar:first-child { margin-left: 0; }

/* ---------- Icon tile ---------- */
.icon-tile {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: var(--radius-md);
  background: var(--color-primary-50); color: var(--color-primary);
  flex-shrink: 0;
}
.icon-tile svg { width: 24px; height: 24px; }
.icon-tile-sm { width: 36px; height: 36px; border-radius: var(--radius-sm); }
.icon-tile-sm svg { width: 20px; height: 20px; }
.icon-tile-lg { width: 56px; height: 56px; border-radius: var(--radius-lg); }
.icon-tile-lg svg { width: 28px; height: 28px; }
.icon-tile.success { background: var(--color-success-bg); color: var(--color-success); }
.icon-tile.warning { background: var(--color-warning-bg); color: var(--color-warning); }
.icon-tile.purple { background: var(--color-purple-bg); color: var(--color-purple); }
.icon-tile.neutral { background: var(--color-slate-100); color: var(--color-slate-600); }

/* ---------- Progress bar ---------- */
.progress {
  width: 100%; height: 8px;
  background: var(--color-slate-100); border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar {
  height: 100%; border-radius: var(--radius-full);
  background: var(--color-primary);
  transition: width var(--transition-slow);
}
.progress-bar.success { background: var(--color-success); }
.progress-bar.warning { background: var(--color-warning); }
.progress-bar.purple { background: var(--color-purple); }

/* ---------- Navbar ---------- */
.navbar {
  position: sticky; top: 0; z-index: var(--z-navbar);
  background: rgba(248, 250, 252, 0.8);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.navbar-inner {
  height: var(--navbar-height);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-6);
}
.navbar-brand { display: inline-flex; align-items: center; gap: var(--space-2); font-weight: var(--font-bold); font-size: var(--text-lg); letter-spacing: var(--tracking-tight); }
.navbar-brand .logo-mark {
  width: 32px; height: 32px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary), #6366F1);
  display: grid; place-items: center; color: #fff;
  box-shadow: var(--shadow-primary);
}
.navbar-brand .logo-mark svg { width: 18px; height: 18px; }

.nav-links { display: flex; align-items: center; gap: var(--space-1); }
.nav-link {
  font-size: var(--text-sm); font-weight: var(--font-medium);
  color: var(--color-text-secondary); padding: 0.5rem 0.85rem;
  border-radius: var(--radius-md); transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--color-text); background: var(--color-slate-100); }
.nav-link.active { color: var(--color-primary); background: var(--color-primary-50); }

.nav-link-with-dropdown {
  position: relative;
}
.nav-link-with-dropdown .nav-link {
  display: inline-flex;
  align-items: center;
}
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 160px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: all 0.15s ease;
  z-index: var(--z-dropdown);
}
.nav-link-with-dropdown:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown-item {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}
.nav-dropdown-item:hover {
  color: var(--color-text);
  background: var(--color-slate-100);
}

.nav-actions { display: flex; align-items: center; gap: var(--space-2); }

.nav-toggle { display: none; padding: 0.5rem; border-radius: var(--radius-md); color: var(--color-text-secondary); }
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 1024px) {
  .nav-links, .nav-actions > .btn:not(.nav-toggle) { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: var(--navbar-height); left: 0; right: 0;
    background: var(--color-surface); border-bottom: 1px solid var(--color-border);
    padding: var(--space-3); gap: var(--space-1); box-shadow: var(--shadow-lg);
  }
  .nav-links.open .nav-link { padding: 0.75rem 1rem; }
  .nav-links.open .nav-link-with-dropdown { display: block; }
  .nav-links.open .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding: 0 0 0 var(--space-4);
    background: transparent;
  }
  .nav-links.open .nav-dropdown-item { padding: 0.5rem 0.85rem; }
}

/* ---------- FAQ ---------- */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
}
.faq-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-text);
  list-style: none;
  position: relative;
  padding-right: var(--space-6);
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--text-xl);
  color: var(--color-text-tertiary);
  transition: transform var(--transition);
}
.faq-item[open] summary::after {
  content: '−';
}

/* ---------- Sidebar ---------- */
.sidebar {
  width: 256px; flex-shrink: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  height: fit-content;
  position: sticky; top: calc(var(--navbar-height) + var(--space-6));
}
.sidebar-section + .sidebar-section { margin-top: var(--space-6); }
.sidebar-label {
  font-size: var(--text-xs); font-weight: var(--font-semibold);
  color: var(--color-text-tertiary); letter-spacing: var(--tracking-wide);
  text-transform: uppercase; padding: 0 var(--space-2); margin-bottom: var(--space-2);
}
.sidebar-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: 0.6rem 0.75rem; border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: var(--font-medium);
  color: var(--color-text-secondary); transition: all var(--transition);
}
.sidebar-item svg { width: 20px; height: 20px; flex-shrink: 0; }
.sidebar-item:hover { background: var(--color-slate-100); color: var(--color-text); }
.sidebar-item.active { background: var(--color-primary-50); color: var(--color-primary); font-weight: var(--font-semibold); }
.sidebar-item .badge { margin-left: auto; }

@media (max-width: 880px) {
  .sidebar { display: none; }
}

/* ---------- Footer ---------- */
.footer { background: var(--color-surface); border-top: 1px solid var(--color-border); padding-block: var(--space-16) var(--space-8); margin-top: var(--space-24); }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(4, 1fr); gap: var(--space-8); }
.footer-brand p { font-size: var(--text-sm); max-width: 32ch; margin-top: var(--space-3); }
.footer-col h5 { font-size: var(--text-sm); font-weight: var(--font-semibold); margin-bottom: var(--space-3); }
.footer-col a { display: block; font-size: var(--text-sm); color: var(--color-text-secondary); padding: 0.35rem 0; transition: color var(--transition); }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); margin-top: var(--space-12); padding-top: var(--space-6); border-top: 1px solid var(--color-border); flex-wrap: wrap; }
.footer-bottom p { font-size: var(--text-sm); color: var(--color-text-tertiary); }
.footer-social { display: flex; gap: var(--space-2); }
.footer-social a { width: 36px; height: 36px; border-radius: var(--radius-md); display: grid; place-items: center; color: var(--color-text-tertiary); border: 1px solid var(--color-border); transition: all var(--transition); }
.footer-social a:hover { color: var(--color-primary); border-color: var(--color-primary-200); background: var(--color-primary-50); }
.footer-social svg { width: 18px; height: 18px; }

@media (max-width: 880px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding-block: var(--space-24) var(--space-20); }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-16); align-items: center; }
.hero h1 { font-size: clamp(2.5rem, 5vw, 4rem); letter-spacing: var(--tracking-tighter); line-height: 1.05; }
.hero-lead { font-size: var(--text-xl); color: var(--color-text-secondary); max-width: 52ch; margin-top: var(--space-5); line-height: var(--leading-normal); }
.hero-actions { display: flex; gap: var(--space-3); margin-top: var(--space-8); flex-wrap: wrap; }
.hero-trust { display: flex; align-items: center; gap: var(--space-4); margin-top: var(--space-10); flex-wrap: wrap; }
.hero-trust .stat { display: flex; flex-direction: column; }
.hero-trust .stat b { font-size: var(--text-2xl); font-weight: var(--font-bold); letter-spacing: var(--tracking-tight); }
.hero-trust .stat span { font-size: var(--text-sm); color: var(--color-text-tertiary); }
.hero-trust .divider-v { width: 1px; height: 36px; background: var(--color-border); }

/* Hero visual */
.hero-visual { position: relative; }
.hero-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl); box-shadow: var(--shadow-xl); padding: var(--space-6);
}
.hero-card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-5); }
.hero-card-head .dots { display: flex; gap: 6px; }
.hero-card-head .dots span { width: 10px; height: 10px; border-radius: 50%; background: var(--color-slate-200); }
.hero-card-head .dots span:first-child { background: #FF5F57; }
.hero-card-head .dots span:nth-child(2) { background: #FEBC2E; }
.hero-card-head .dots span:nth-child(3) { background: #28C840; }

.hero-grid-bg {
  position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 60% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 60% 40%, #000 30%, transparent 75%);
  opacity: 0.5;
}
.hero-glow {
  position: absolute; z-index: -1; border-radius: 50%;
  filter: blur(80px); opacity: 0.4;
}
.hero-glow.one { width: 360px; height: 360px; background: var(--color-primary); top: -80px; right: -40px; opacity: 0.18; }
.hero-glow.two { width: 280px; height: 280px; background: #8B5CF6; bottom: -60px; left: 10%; opacity: 0.14; }

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--space-12); }
  .hero-visual { order: -1; }
}

/* ---------- Stats strip ---------- */
.stats-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
.stat-card { padding: var(--space-6); }
.stat-card .stat-icon { margin-bottom: var(--space-4); }
.stat-card .stat-value { font-size: var(--text-4xl); font-weight: var(--font-bold); letter-spacing: var(--tracking-tighter); line-height: 1; }
.stat-card .stat-label { font-size: var(--text-sm); color: var(--color-text-secondary); margin-top: var(--space-2); }
.stat-card .stat-trend { display: inline-flex; align-items: center; gap: 4px; font-size: var(--text-xs); font-weight: var(--font-semibold); color: var(--color-success); margin-top: var(--space-3); }
.stat-card .stat-trend svg { width: 14px; height: 14px; }

@media (max-width: 960px) { .stats-strip { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .stats-strip { grid-template-columns: 1fr; } }

/* ---------- Feature / pillar cards ---------- */
.feature-card { padding: var(--space-8); display: flex; flex-direction: column; gap: var(--space-4); height: 100%; }
.feature-card h3 { font-size: var(--text-xl); }
.feature-card p { font-size: var(--text-sm); }
.feature-card .feature-link { margin-top: auto; font-size: var(--text-sm); font-weight: var(--font-semibold); color: var(--color-primary); display: inline-flex; align-items: center; gap: var(--space-1); }
.feature-card .feature-link svg { width: 16px; height: 16px; transition: transform var(--transition); }
.feature-card:hover .feature-link svg { transform: translateX(3px); }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: var(--space-8); }
.timeline::before { content: ""; position: absolute; left: 11px; top: 8px; bottom: 8px; width: 2px; background: var(--color-border); }
.timeline-item { position: relative; padding-bottom: var(--space-10); }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ""; position: absolute; left: -29px; top: 4px;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--color-surface); border: 2px solid var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-50);
}
.timeline-item.done::before { background: var(--color-primary); }
.timeline-item .tl-stage { font-size: var(--text-xs); font-weight: var(--font-semibold); color: var(--color-primary); letter-spacing: var(--tracking-wide); }
.timeline-item h4 { font-size: var(--text-lg); margin-top: var(--space-1); }
.timeline-item p { font-size: var(--text-sm); margin-top: var(--space-2); }

/* Horizontal stepper */
.stepper { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); counter-reset: step; }
.step-card { padding: var(--space-6); position: relative; }
.step-card .step-num {
  width: 36px; height: 36px; border-radius: var(--radius-full);
  background: var(--color-primary-50); color: var(--color-primary);
  display: grid; place-items: center; font-weight: var(--font-bold); font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}
.step-card.active .step-num { background: var(--color-primary); color: #fff; }
.step-card h4 { font-size: var(--text-base); margin-bottom: var(--space-2); }
.step-card p { font-size: var(--text-sm); }
@media (max-width: 960px) { .stepper { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .stepper { grid-template-columns: 1fr; } }

/* ---------- Course card ---------- */
.course-card { overflow: hidden; display: flex; flex-direction: column; }
.course-thumb { height: 160px; position: relative; overflow: hidden; display: grid; place-items: center; color: #fff; }
.course-thumb > svg { width: 88px; height: 88px; opacity: 0.9; }
.course-thumb .course-level { position: absolute; top: var(--space-3); left: var(--space-3); }
.course-body { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.course-body h3 { font-size: var(--text-lg); }
.course-body p { font-size: var(--text-sm); }
.course-meta { display: flex; align-items: center; gap: var(--space-4); font-size: var(--text-xs); color: var(--color-text-tertiary); margin-top: auto; }
.course-meta span { display: inline-flex; align-items: center; gap: 4px; }
.course-meta svg { width: 15px; height: 15px; }
.course-foot { display: flex; align-items: center; justify-content: space-between; padding-top: var(--space-4); border-top: 1px solid var(--color-border); }
.course-foot .price { font-weight: var(--font-bold); font-size: var(--text-lg); }
.course-foot .price .free { color: var(--color-success); }

/* ---------- Annotation card ---------- */
.annot-card { padding: var(--space-6); display: flex; flex-direction: column; gap: var(--space-4); }
.annot-head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-3); }
.annot-head > div:first-child { min-width: 0; flex: 1; }
.annot-head h3 { font-size: var(--text-lg); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin: 0; }
.annot-head p { font-size: var(--text-sm); margin-top: var(--space-1); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; line-height: 1.5; }
.annot-head .badge { flex-shrink: 0; white-space: nowrap; }
.annot-meta { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-2); padding: var(--space-4) 0; border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.annot-meta .m { display: flex; flex-direction: column; }
.annot-meta .m b { font-size: var(--text-base); font-weight: var(--font-semibold); }
.annot-meta .m span { font-size: var(--text-xs); color: var(--color-text-tertiary); }
.annot-foot { display: flex; align-items: center; gap: var(--space-3); margin-top: auto; }

/* ---------- Training card ---------- */
.train-card { padding: var(--space-6); display: flex; flex-direction: column; gap: var(--space-4); }
.train-head { display: flex; align-items: center; gap: var(--space-3); }
.train-head h3 { font-size: var(--text-lg); }
.train-head .model-tag { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-tertiary); }
.train-body p { font-size: var(--text-sm); }
.train-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
.train-metric { background: var(--color-slate-50); border-radius: var(--radius-md); padding: var(--space-3); }
.train-metric .label { font-size: var(--text-xs); color: var(--color-text-tertiary); display: flex; align-items: center; gap: 4px; }
.train-metric .value { font-size: var(--text-lg); font-weight: var(--font-bold); margin-top: 2px; }
.train-foot { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-top: auto; }

/* ---------- Chart bars (pure CSS) ---------- */
.chart { padding: var(--space-6); }
.chart-bars { display: flex; align-items: flex-end; gap: var(--space-3); height: 200px; padding-top: var(--space-4); }
.chart-bar { flex: 1; display: flex; flex-direction: column; align-items: center; gap: var(--space-2); height: 100%; justify-content: flex-end; }
.chart-bar .bar { width: 100%; max-width: 36px; background: linear-gradient(180deg, var(--color-primary), #6366F1); border-radius: var(--radius-sm) var(--radius-sm) 0 0; transition: height var(--transition-slow); min-height: 4px; }
.chart-bar .bar.alt { background: var(--color-slate-200); }
.chart-bar .lbl { font-size: var(--text-xs); color: var(--color-text-tertiary); }

/* Donut (SVG) ring */
.ring-stat { display: flex; align-items: center; gap: var(--space-5); }
.ring-stat svg { width: 120px; height: 120px; flex-shrink: 0; transform: rotate(-90deg); }
.ring-stat .ring-track { stroke: var(--color-slate-100); }
.ring-stat .ring-fill { stroke: var(--color-primary); stroke-linecap: round; transition: stroke-dashoffset var(--transition-slow); }

/* ---------- Table ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius-xl); border: 1px solid var(--color-border); }
.sticky-x-scrollbar { overflow-x: auto; overflow-y: hidden; height: 14px; position: sticky; bottom: 0; z-index: 5; background: var(--color-surface); border: 1px solid var(--color-border); border-top: none; border-radius: 0 0 var(--radius-xl) var(--radius-xl); margin-top: -1px; }
.sticky-x-scrollbar > div { height: 1px; }
.sticky-x-scrollbar::-webkit-scrollbar { height: 10px; }
.sticky-x-scrollbar::-webkit-scrollbar-thumb { background: var(--color-slate-300); border-radius: 5px; }
.sticky-x-scrollbar::-webkit-scrollbar-track { background: transparent; }
table.data-table { width: 100%; border-collapse: collapse; background: var(--color-surface); min-width: 640px; }
.data-table th, .data-table td { padding: var(--space-4) var(--space-5); text-align: left; font-size: var(--text-sm); }
.data-table th { font-weight: var(--font-semibold); color: var(--color-text-tertiary); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); text-transform: uppercase; background: var(--color-slate-50); border-bottom: 1px solid var(--color-border); }
.data-table td { border-bottom: 1px solid var(--color-border); color: var(--color-text-secondary); }
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table tbody tr:hover { background: var(--color-slate-50); }
.data-table .cell-strong { color: var(--color-text); font-weight: var(--font-medium); }

/* ---------- Activity feed ---------- */
.activity-item { display: flex; gap: var(--space-3); padding: var(--space-3) 0; }
.activity-item + .activity-item { border-top: 1px solid var(--color-border); }
.activity-item .dot { width: 32px; height: 32px; border-radius: var(--radius-full); display: grid; place-items: center; flex-shrink: 0; }
.activity-item p { font-size: var(--text-sm); color: var(--color-text); }
.activity-item p b { font-weight: var(--font-semibold); }
.activity-item time { font-size: var(--text-xs); color: var(--color-text-tertiary); }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--color-slate-900);
  border-radius: var(--radius-2xl);
  padding: var(--space-16);
  text-align: center;
  position: relative; overflow: hidden;
}
.cta-band h2 { color: #fff; font-size: var(--text-4xl); letter-spacing: var(--tracking-tighter); }
.cta-band p { color: var(--color-slate-300); font-size: var(--text-lg); max-width: 52ch; margin: var(--space-4) auto 0; }
.cta-band .cta-actions { display: flex; gap: var(--space-3); justify-content: center; margin-top: var(--space-8); flex-wrap: wrap; }
.cta-band .grid-deco {
  position: absolute; inset: 0; opacity: 0.12;
  background-image: linear-gradient(rgba(255,255,255,.5) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.5) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 60% 80% at 50% 0%, #000, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 60% 80% at 50% 0%, #000, transparent 70%);
}

/* ---------- Page header ---------- */
.page-header { padding-block: var(--space-16) var(--space-12); }
.page-header .eyebrow { margin-bottom: var(--space-4); }
.page-header h1 { font-size: var(--text-5xl); letter-spacing: var(--tracking-tighter); }
.page-header p { font-size: var(--text-lg); max-width: 60ch; margin-top: var(--space-4); }

/* ---------- Tabs / pills filter ---------- */
.pill-filter { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.pill {
  font-size: var(--text-sm); font-weight: var(--font-medium);
  color: var(--color-text-secondary); padding: 0.5rem 1rem;
  border-radius: var(--radius-full); border: 1px solid var(--color-border);
  background: var(--color-surface); transition: all var(--transition);
}
.pill:hover { border-color: var(--color-slate-400); color: var(--color-text); }
.pill.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ---------- Dashboard layout ---------- */
.dash-layout { display: grid; grid-template-columns: 256px 1fr; gap: var(--space-6); align-items: start; }
.dash-content { display: flex; flex-direction: column; gap: var(--space-6); min-width: 0; }
.dash-view { display: flex; flex-direction: column; gap: var(--space-6); }
.dash-view[hidden] { display: none; }
.dash-row { display: grid; gap: var(--space-6); }
.dash-row.r-2 { grid-template-columns: 2fr 1fr; }
.dash-row.r-3 { grid-template-columns: repeat(3, 1fr); }
.dash-row.r-4 { grid-template-columns: repeat(4, 1fr); }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-5); }
.panel-head h3 { font-size: var(--text-lg); }
@media (max-width: 1100px) {
  .dash-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .dash-row.r-2, .dash-row.r-3, .dash-row.r-4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .dash-row.r-2, .dash-row.r-3, .dash-row.r-4 { grid-template-columns: 1fr; }
}

/* ---------- List rows ---------- */
.list-row { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) 0; }
.list-row + .list-row { border-top: 1px solid var(--color-border); }
.list-row .lr-main { flex: 1; min-width: 0; }
.list-row .lr-main h4 { font-size: var(--text-sm); font-weight: var(--font-semibold); }
.list-row .lr-main p { font-size: var(--text-xs); }
.list-row .lr-meta { text-align: right; font-size: var(--text-xs); color: var(--color-text-tertiary); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: var(--space-6); left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--color-slate-900); color: #fff; padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md); font-size: var(--text-sm); box-shadow: var(--shadow-xl);
  opacity: 0; pointer-events: none; transition: all var(--transition); z-index: 9999;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Helpers ---------- */
.thumb-grad-1 { background: linear-gradient(135deg, #3B82F6, #6366F1); }
.thumb-grad-2 { background: linear-gradient(135deg, #8B5CF6, #EC4899); }
.thumb-grad-3 { background: linear-gradient(135deg, #06B6D4, #3B82F6); }
.thumb-grad-4 { background: linear-gradient(135deg, #10B981, #06B6D4); }
.thumb-grad-5 { background: linear-gradient(135deg, #F59E0B, #EF4444); }
.thumb-grad-6 { background: linear-gradient(135deg, #334155, #64748B); }

/* ---------- Language switcher ---------- */
.lang-switch { position: relative; display: inline-flex; }
.lang-btn { gap: var(--space-1); }
.lang-btn svg { width: 18px; height: 18px; }
.lang-current { font-size: var(--text-sm); font-weight: var(--font-semibold); min-width: 24px; text-align: left; }
.lang-menu {
  position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-lg);
  padding: var(--space-1); min-width: 150px; z-index: var(--z-dropdown);
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}
.lang-menu.open { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu button {
  display: flex; align-items: center; gap: var(--space-2); width: 100%;
  padding: 0.55rem 0.7rem; border-radius: var(--radius-sm);
  font-size: var(--text-sm); font-weight: var(--font-medium); color: var(--color-text-secondary);
  text-align: left; transition: background var(--transition), color var(--transition);
}
.lang-menu button:hover { background: var(--color-slate-100); color: var(--color-text); }
.lang-menu button.active { color: var(--color-primary); background: var(--color-primary-50); font-weight: var(--font-semibold); }
.lang-menu button .lang-check { margin-left: auto; width: 16px; height: 16px; color: var(--color-primary); }

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(2px); -webkit-backdrop-filter: blur(2px);
  display: grid; place-items: center; padding: var(--space-6);
  opacity: 0; pointer-events: none; transition: opacity var(--transition);
  z-index: 1000;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal {
  width: 100%; max-width: 520px; max-height: 90vh; overflow: auto;
  background: var(--color-surface); border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl); padding: var(--space-8);
  transform: translateY(12px) scale(0.98); transition: transform var(--transition);
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-6); }
.modal-head h3 { font-size: var(--text-xl); }
.modal-close { color: var(--color-text-tertiary); padding: var(--space-2); border-radius: var(--radius-sm); transition: all var(--transition); }
.modal-close:hover { background: var(--color-slate-100); color: var(--color-text); }
.modal-close svg { width: 20px; height: 20px; display: block; }
.modal-foot { display: flex; justify-content: flex-end; gap: var(--space-3); margin-top: var(--space-6); }

/* ---------- Form fields ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4) var(--space-5); }
.form-field { display: flex; flex-direction: column; gap: var(--space-2); }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: var(--text-sm); font-weight: var(--font-medium); color: var(--color-text-secondary); }
.form-field .control { width: 100%; height: 42px; padding: 0 var(--space-3);
  border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff;
  font-size: var(--text-sm); font-family: inherit; color: var(--color-text); outline: none;
  box-sizing: border-box; transition: border-color var(--transition), box-shadow var(--transition); }
.form-field textarea.control { height: auto; padding: var(--space-3); resize: vertical; }
.form-field .control:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-50); }
.form-field .hint { font-size: var(--text-xs); color: var(--color-text-tertiary); }
.form-error { display: none; color: var(--color-danger); font-size: var(--text-sm);
  padding: var(--space-2) var(--space-3); background: var(--color-danger-bg);
  border-radius: var(--radius-md); margin-bottom: var(--space-4); }
.form-error.show { display: block; }
@media (max-width: 560px) { .form-grid { grid-template-columns: 1fr; } }

/* ---------- Confirm dialog ---------- */
.confirm-modal { max-width: 400px; text-align: center; }
.confirm-modal .confirm-icon { width: 52px; height: 52px; border-radius: var(--radius-full);
  background: var(--color-danger-bg); color: var(--color-danger); display: grid; place-items: center;
  margin: 0 auto var(--space-4); }
.confirm-modal .confirm-icon svg { width: 26px; height: 26px; }
.confirm-modal p { color: var(--color-text-secondary); font-size: var(--text-sm); margin-top: var(--space-2); }

/* ---------- Toolbar ---------- */
.toolbar { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.toolbar .search-input { height: 40px; padding: 0 var(--space-3) 0 var(--space-8); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); background: var(--color-surface); font-size: var(--text-sm); width: 240px;
  outline: none; transition: border-color var(--transition), box-shadow var(--transition); box-sizing: border-box; }
.toolbar .search-input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-50); }
.search-wrap { position: relative; display: inline-flex; align-items: center; }
.search-wrap > svg, .search-wrap > i { position: absolute; left: var(--space-3); width: 16px; height: 16px; color: var(--color-text-tertiary); pointer-events: none; display: inline-flex; align-items: center; }
.search-wrap .search-input { padding-left: var(--space-8); }
.toolbar .search-wrap { /* toolbar variant inherits base */ }
.toolbar .spacer { flex: 1; }

/* ===== Nav user avatar + hover dropdown ===== */
.nav-user { position: relative; display: inline-flex; }
.nav-user-btn { background: none; border: none; padding: 2px; cursor: pointer; border-radius: 50%; display: inline-flex; align-items: center; }
.nav-user-btn .avatar { border: 2px solid transparent; transition: border-color var(--transition); }
.nav-user:hover .nav-user-btn .avatar,
.nav-user-btn[aria-expanded="true"] .avatar { border-color: var(--color-primary); }
.nav-user-menu {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 224px;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-lg);
  padding: var(--space-2); opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 100;
}
.nav-user:hover .nav-user-menu,
.nav-user-menu.open { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-user-head { padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-1); }
.nav-user-name { font-weight: var(--font-semibold); font-size: var(--text-sm); color: var(--color-text); }
.nav-user-email { font-size: var(--text-xs); color: var(--color-text-tertiary); margin-top: 2px; }
.nav-user-item {
  display: flex; align-items: center; gap: var(--space-2); width: 100%;
  padding: var(--space-2) var(--space-3); border: none; background: none;
  font-size: var(--text-sm); color: var(--color-text); text-align: left;
  text-decoration: none; border-radius: var(--radius-sm); cursor: pointer;
  font-family: inherit;
}
.nav-user-item:hover { background: var(--color-slate-100); }
.nav-user-divider { height: 1px; background: var(--color-border); margin: var(--space-1) 0; }

/* ============================================================
   妙境AI · Home Page Sections (v2 - AI Developer Platform)
   ============================================================ */

/* ---------- Hero gradient text (new sizing) ---------- */
.hero-gradient {
  display: inline-block;
  font-size: 0.75em;
  font-weight: 700;
  margin-top: var(--space-2);
}

/* ---------- Hero code card ---------- */
.hero-code-card { padding: var(--space-5); }
.code-block {
  background: var(--color-slate-900);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.9;
  color: var(--color-slate-300);
}
.code-block .c-com { color: var(--color-slate-500); }
.code-block .c-kw { color: #F472B6; }
.code-block .c-str { color: #FCD34D; }
.code-block .c-fn { color: #60A5FA; }
.code-block .c-var { color: #A5B4FC; }
.code-block .c-num { color: #34D399; }
.code-block .c-sep { height: 6px; }

/* ---------- Hero pipeline steps ---------- */
.hero-pipeline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding: var(--space-4);
  background: var(--color-slate-50);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.hp-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  flex: 1;
  min-width: 0;
}
.hp-step svg { width: 18px; height: 18px; color: var(--color-primary); }
.hp-step span {
  font-weight: var(--font-medium);
  font-size: 11px;
  white-space: nowrap;
}
.hp-arrow {
  width: 12px;
  height: 12px;
  color: var(--color-slate-300);
  flex-shrink: 0;
}
.hp-arrow svg { width: 12px; height: 12px; }

@media (max-width: 640px) {
  .hero-pipeline { flex-wrap: wrap; justify-content: center; }
  .hp-step { flex: 0 0 auto; padding: 4px 8px; }
  .hp-arrow { display: none; }
}

/* ---------- Pipeline flow (AI Workspace section) ---------- */
.pipeline-flow {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}
.pipeline-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-6) var(--space-4);
  min-width: 130px;
  flex: 1;
  text-decoration: none;
  color: var(--color-text);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.pipeline-node:hover {
  background: var(--color-surface);
  border-color: var(--color-border);
  transform: translateY(-2px);
}
.pn-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--color-primary-50);
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}
.pn-icon svg { width: 26px; height: 26px; }
.pn-success { background: var(--color-success-bg); color: var(--color-success); }
.pn-purple { background: var(--color-purple-bg); color: var(--color-purple); }
.pn-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.pn-danger { background: var(--color-danger-bg); color: var(--color-danger); }
.pn-label {
  font-weight: var(--font-semibold);
  font-size: var(--text-base);
  color: var(--color-text);
}
.pn-desc {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}
.pipeline-arrow {
  display: flex;
  align-items: center;
  color: var(--color-slate-300);
  padding: 0 var(--space-1);
}
.pipeline-arrow svg { width: 20px; height: 20px; }

@media (max-width: 960px) {
  .pipeline-node { min-width: 100px; flex: 1 1 30%; }
  .pipeline-arrow { display: none; }
}

/* ---------- Tool cards (AI Tools section) ---------- */

.tools-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-6);
}
.tool-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-text);
  position: relative;
  overflow: hidden;
  padding: var(--space-7);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  box-sizing: border-box;
  flex: 1 1 calc(33.333% - var(--space-4));
  min-width: 300px;
  max-width: 380px;
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-slate-300);
}
.tool-card .icon-tile-lg {
  margin-bottom: var(--space-5);
  flex-shrink: 0;
}
.tool-card h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  line-height: 1.3;
  margin: 0;
}
.tool-card .mt-4 { margin-top: var(--space-4); }
.tool-card .mt-3 { margin-top: var(--space-3); }
.tool-card > .mt-4:last-of-type {
  margin-top: auto;
  padding-top: var(--space-4);
}
.tool-card-featured {
  border-color: var(--color-primary-200);
  background: linear-gradient(180deg, var(--color-primary-50) 0%, var(--color-surface) 60%);
}
.tool-card-badge {
  position: absolute;
  top: var(--space-5);
  right: var(--space-5);
  background: var(--color-primary);
  color: #fff;
  font-size: 10px;
  font-weight: var(--font-semibold);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  z-index: 1;
}
.tool-tag {
  color: var(--color-text-tertiary);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 11px;
  margin: var(--space-2) 0 0 0;
}
.tool-icon-primary {
  background: linear-gradient(135deg, #3B82F6, #6366F1);
  color: #fff;
}
.btn-soft-success { background: var(--color-success-bg); color: var(--color-success); }
.btn-soft-success:hover { background: #D1FAE5; }
.tool-card-soon {
  cursor: not-allowed;
  opacity: 0.85;
}
.tool-card-soon:hover {
  transform: none;
  box-shadow: var(--shadow-sm);
  border-color: var(--color-border);
}

/* ---------- Learning ladder ---------- */
.learning-ladder {
  position: relative;
  padding-left: var(--space-4);
}
.ladder-step {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  position: relative;
}
.ladder-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-primary-50);
  color: var(--color-primary);
  font-weight: var(--font-bold);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}
.ladder-content { flex: 1; padding-bottom: var(--space-6); }
.ladder-stage {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ladder-content h4 { margin-top: var(--space-1); }
.ladder-content p { margin-top: var(--space-2); font-size: var(--text-sm); }
.ladder-connector {
  width: 2px;
  height: var(--space-4);
  background: var(--color-border);
  margin-left: 19px;
}

/* ---------- Data flow ---------- */
.data-flow {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}
.df-node {
  flex: 1;
  min-width: 150px;
  text-align: center;
  padding: var(--space-6) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.df-node h4 { margin-top: var(--space-3); font-size: var(--text-lg); }
.df-node p { margin-top: var(--space-2); font-size: var(--text-xs); color: var(--color-text-secondary); }
.df-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-primary-50);
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.df-icon svg { width: 28px; height: 28px; }
.df-success { background: var(--color-success-bg); color: var(--color-success); }
.df-purple { background: var(--color-purple-bg); color: var(--color-purple); }
.df-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.df-highlight {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}
.df-arrow {
  display: flex;
  align-items: center;
  color: var(--color-slate-300);
  padding: 0 var(--space-2);
}
.df-arrow svg { width: 20px; height: 20px; }

@media (max-width: 960px) {
  .df-node { flex: 1 1 40%; }
  .df-arrow { display: none; }
}

/* ---------- AI Engineering section ---------- */
.eng-list { display: flex; flex-direction: column; gap: var(--space-4); }
.eng-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}
.eng-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-50);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}
.eng-icon svg { width: 22px; height: 22px; }
.eng-item h4 { font-size: var(--text-lg); }

.eng-visual { position: relative; }
.eng-card { padding: var(--space-6); }
.eng-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}
.eng-steps { display: flex; flex-direction: column; gap: var(--space-4); }
.eng-step {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-slate-50);
  transition: background var(--transition);
}
.eng-step.done { background: var(--color-success-bg); }
.eng-step.active {
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-200);
}
.eng-step-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-slate-200);
  color: var(--color-slate-500);
}
.eng-step.done .eng-step-icon { background: var(--color-success); color: #fff; }
.eng-step.active .eng-step-icon { background: var(--color-primary); color: #fff; }
.eng-step-icon svg { width: 16px; height: 16px; }
.eng-step-title {
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  color: var(--color-text);
}
.eng-step-sub {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: 2px;
}
.eng-step.done .eng-step-sub { color: var(--color-success); opacity: 0.8; }

@media (max-width: 960px) {
  .eng-visual { order: -1; margin-bottom: var(--space-8); }
}

/* ---------- AI Tools Hub ---------- */
.tool-search {
  position: relative;
  margin-bottom: var(--space-6);
}
.tool-search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
}
.tool-search-icon svg { width: 20px; height: 20px; }
.tool-search-input {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-5) 0 44px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.tool-search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-50);
}
.tool-search-input::placeholder {
  color: var(--color-text-tertiary);
}

.tool-tabs {
  display: flex;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-8);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}
.tool-tabs::-webkit-scrollbar { display: none; }
.tool-tab {
  flex-shrink: 0;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
  white-space: nowrap;
}
.tool-tab:hover {
  color: var(--color-text);
  border-color: var(--color-slate-300);
}
.tool-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.tool-icon-primary { background: linear-gradient(135deg, #3B82F6, #6366F1); color: #fff; }
.tool-icon-success { background: var(--color-success-bg); color: var(--color-success); }
.tool-icon-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.tool-icon-pink { background: linear-gradient(135deg, #EC4899, #8B5CF6); color: #fff; }
.tool-icon-teal { background: linear-gradient(135deg, #10B981, #3B82F6); color: #fff; }
.tool-icon-purple { background: linear-gradient(135deg, #8B5CF6, #EC4899); color: #fff; }

.tools-featured { margin-bottom: var(--space-12); }

.tool-empty {
  text-align: center;
  padding: var(--space-16) var(--space-6);
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
}
.tool-empty svg {
  width: 48px; height: 48px;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-4);
}
.tool-empty h4 { font-size: var(--text-xl); }
.tool-empty p { margin-top: var(--space-2); font-size: var(--text-sm); }

.tools-cta {
  text-align: center;
}
.tools-cta h2 { font-size: var(--text-3xl); }
.tools-cta .cta-actions { justify-content: center; }

@media (max-width: 640px) {
  .tool-search-input { height: 44px; font-size: var(--text-sm); }
  .tool-tab { padding: 0.4rem 0.9rem; font-size: var(--text-xs); }
  .tools-featured { margin-bottom: var(--space-8); }
}

/* ============================================================
   Legal & Info Pages (Privacy, Terms, Security, Cookie, About, Contact, FAQ)
   ============================================================ */

/* Page header (used by non-home pages) */
.page-header {
  padding: var(--space-16) 0 var(--space-10);
  text-align: center;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.page-header .eyebrow {
  display: inline-flex;
}
.page-header h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tighter);
  max-width: 720px;
  margin-inline: auto;
}
.page-header p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-inline: auto;
}
@media (max-width: 640px) {
  .page-header { padding: var(--space-12) 0 var(--space-8); }
  .page-header h1 { font-size: var(--text-2xl); }
  .page-header p { font-size: var(--text-base); }
}

.legal-updated {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  font-weight: var(--font-medium);
}

/* Container narrow for legal/article pages */
.container-narrow {
  max-width: 760px;
  margin: 0 auto;
}

/* Prose / article styling */
.prose h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  letter-spacing: var(--tracking-tight);
}
.prose h2:first-child { margin-top: 0; }
.prose h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}
.prose p {
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}
.prose ul {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
  color: var(--color-text-secondary);
  line-height: 1.8;
}
.prose li {
  margin-bottom: var(--space-2);
  font-size: var(--text-base);
}
.prose strong { color: var(--color-text); }
.prose section { scroll-margin-top: calc(var(--navbar-height) + var(--space-4)); }

/* Legal table of contents */
.legal-nav {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-10);
}
.legal-nav ol {
  list-style: none;
  padding: 0;
  margin: 0;
  columns: 2;
  column-gap: var(--space-6);
}
.legal-nav li {
  margin-bottom: var(--space-2);
  break-inside: avoid;
}
.legal-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.legal-nav a:hover {
  color: var(--color-primary);
}
.legal-nav a::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-border);
  transition: background var(--transition);
  flex-shrink: 0;
}
.legal-nav a:hover::before {
  background: var(--color-primary);
}
@media (max-width: 640px) {
  .legal-nav ol { columns: 1; }
}

/* Legal content */
.legal-content {
  padding-bottom: var(--space-16);
}

/* Callout / info box */
.callout {
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-200);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  margin: var(--space-6) 0;
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: var(--text-sm);
}
.callout strong { color: var(--color-primary-700); }

/* Feature grid (used on about and security pages) */
.feature-grid {
  margin: var(--space-10) 0;
}
.feature-grid .card {
  text-align: left;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.feature-grid .card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-slate-300);
}

/* ---------- Contact Page ---------- */
.contact-card {
  max-width: 560px;
  margin: 0 auto;
}
.contact-form .form-group {
  margin-bottom: var(--space-5);
}
.contact-form label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.contact-form .control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-family: inherit;
  background: var(--color-surface);
  color: var(--color-text);
  transition: all var(--transition);
  box-sizing: border-box;
}
.contact-form .control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-50);
}
.contact-form textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.6;
}
.contact-form select.control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}
.form-note {
  margin: var(--space-2) 0 var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}
.btn-block {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

/* ---------- FAQ Page ---------- */
.faq-section {
  margin-bottom: var(--space-10);
}
.faq-category {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-border);
}
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
  overflow: hidden;
  background: var(--color-surface);
  transition: border-color var(--transition);
}
.faq-item:hover { border-color: var(--color-slate-300); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text);
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}
.faq-question svg {
  width: 18px;
  height: 18px;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-question[aria-expanded="true"] svg {
  transform: rotate(180deg);
  color: var(--color-primary);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-answer p {
  padding: 0 var(--space-5) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ---------- 404 Page ---------- */
.not-found-section {
  padding: var(--space-20) 0 var(--space-16);
  min-height: calc(100vh - var(--navbar-height) - 300px);
  display: grid;
  place-items: center;
}
.not-found-code {
  font-size: clamp(5rem, 15vw, 10rem);
  font-weight: var(--font-extrabold);
  background: linear-gradient(135deg, var(--color-primary), #8B5CF6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  letter-spacing: -0.05em;
}
.not-found-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tight);
}
.not-found-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 480px;
  margin-inline: auto;
}
.not-found-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}
.not-found-actions .btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.not-found-actions .btn svg { width: 18px; height: 18px; }
.not-found-links {
  max-width: 720px;
  margin-inline: auto;
}
.not-found-card {
  text-decoration: none;
  color: var(--color-text);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.not-found-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-300);
}
.not-found-card h4 {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
}

/* ---------- Utility: text-center ---------- */
.text-center { text-align: center; }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }

/* ---------- Icon tile additions ---------- */
.icon-tile svg { width: 24px; height: 24px; }

/* ---------- Button styles additions ---------- */
.btn-soft {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  border-color: transparent;
}
.btn-soft:hover {
  background: var(--color-primary-100);
  color: var(--color-primary-800);
}
.btn-soft-success {
  background: var(--color-success-bg);
  color: var(--color-success);
}
.btn-soft-success:hover {
  background: #D1FAE5;
}

/* ---------- Models & Training tab switcher ---------- */
.tab-btn {
  background: none;
  border: none;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-tertiary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color .15s, border-color .15s;
  font-family: inherit;
}
.tab-btn:hover { color: var(--color-text-secondary); }
.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ---------- Modal sizes ---------- */
.modal-lg { max-width: 720px; }

/* ---------- Callout ---------- */
.callout {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

/* ---------- Detail grid ---------- */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4) var(--space-6);
}
.detail-item dt {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: .02em;
}
.detail-item dd {
  font-size: var(--text-sm);
  color: var(--color-text);
  margin: 0;
  font-weight: 500;
  word-break: break-all;
}
.detail-section { margin-bottom: var(--space-6); }
.detail-section h4 {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: 600;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}


/* ===== Learning Sidebar ===== */
.learning-sidebar { display: flex; flex-direction: column; gap: var(--space-5); position: sticky; top: 80px; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-xl); padding: var(--space-4); }
.ls-section { }
.ls-section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-3); }
.ls-title { font-size: var(--text-sm); font-weight: var(--font-semibold); color: var(--color-text); margin: 0; }
.ls-section-body { display: flex; flex-direction: column; gap: var(--space-2); }

/* My progress card (student) */
.ls-my-card { background: var(--color-slate-50); border-radius: var(--radius-md); padding: var(--space-3); }
.ls-my-head { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-4); }
.ls-my-info { flex: 1; min-width: 0; }
.ls-my-name { font-size: var(--text-base); font-weight: var(--font-semibold); color: var(--color-text); margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ls-my-stage { font-size: var(--text-xs); }
.ls-my-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-2); margin-bottom: var(--space-3); text-align: center; }
.ls-stat-num-sm { font-size: var(--text-base); font-weight: var(--font-bold); color: var(--color-text); }
.ls-stat-label-sm { font-size: 11px; color: var(--color-text-tertiary); margin-top: 2px; }
.ls-my-cta { margin-top: var(--space-3); }
.ls-my-cta p { margin-bottom: var(--space-2); }

/* Progress bar */
.ls-progress { width: 100%; height: 6px; background: var(--color-slate-100); border-radius: 999px; overflow: hidden; }
.ls-progress-bar { height: 100%; background: var(--color-slate-300); border-radius: 999px; transition: width .3s; }
.ls-progress-bar.primary { background: linear-gradient(90deg, var(--color-primary), var(--color-primary-600)); }

/* Stats card (guest) */
.ls-stats-card { background: linear-gradient(135deg, var(--color-primary-50), var(--color-purple-bg)); border-radius: var(--radius-md); padding: var(--space-3); }
.ls-stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-2); text-align: center; }
.ls-stat-num { font-size: var(--text-lg); font-weight: var(--font-bold); color: var(--color-primary-700); }
.ls-stat-label { font-size: 11px; color: var(--color-text-tertiary); margin-top: 2px; }

/* Leaderboard */
.ls-leader-item { display: flex; align-items: center; gap: var(--space-2); padding: 6px 0; }
.ls-rank { width: 20px; text-align: center; font-size: var(--text-xs); font-weight: var(--font-bold); color: var(--color-text-tertiary); }
.ls-rank.rank-gold { color: #F59E0B; }
.ls-rank.rank-silver { color: #6B7280; }
.ls-rank.rank-bronze { color: #B45309; }
.ls-leader-info { flex: 1; min-width: 0; }
.ls-leader-name { font-size: var(--text-sm); color: var(--color-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ls-leader-hours { font-size: var(--text-xs); color: var(--color-text-tertiary); font-variant-numeric: tabular-nums; }

/* Peers */
.ls-peer-item { display: flex; align-items: center; gap: var(--space-2); padding: 6px 0; }
.ls-peer-info { flex: 1; min-width: 0; }
.ls-peer-name { font-size: var(--text-sm); color: var(--color-text); margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ls-peer-pct { font-size: var(--text-xs); color: var(--color-text-tertiary); font-variant-numeric: tabular-nums; min-width: 32px; text-align: right; }
.ls-online-dot { position: absolute; bottom: 0; right: 0; width: 10px; height: 10px; background: var(--color-success); border: 2px solid var(--color-surface); border-radius: 50%; }
.dot-online { display: inline-block; width: 8px; height: 8px; background: var(--color-success); border-radius: 50%; margin-right: 4px; vertical-align: middle; }

/* Paths */
.ls-path-item { padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border-light); }
.ls-path-item:last-child { border-bottom: none; }
.ls-path-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); margin-bottom: 4px; }
.ls-path-title { font-size: var(--text-sm); color: var(--color-text); font-weight: var(--font-medium); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ls-path-meta { margin-bottom: 6px; }

/* Activity */
.ls-act-item { display: flex; gap: var(--space-2); padding: 6px 0; }
.ls-act-info { flex: 1; min-width: 0; }
.ls-act-text { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.4; }
.ls-act-text strong { color: var(--color-text); font-weight: var(--font-semibold); }
.ls-act-time { font-size: 11px; color: var(--color-text-tertiary); margin-top: 2px; }

/* CTA card */
.ls-cta-card { background: linear-gradient(135deg, var(--color-primary-600), var(--color-purple)); border-radius: var(--radius-md); padding: var(--space-4); color: #fff; }
.ls-cta-title { font-size: var(--text-base); font-weight: var(--font-semibold); margin: 0 0 var(--space-2) 0; color: #fff; }
.ls-cta-desc { font-size: var(--text-sm); color: rgba(255,255,255,.85); margin: 0 0 var(--space-3) 0; line-height: 1.5; }
.ls-cta-card .btn-primary { background: #fff; color: var(--color-primary-700); border-color: #fff; width: 100%; }
.ls-cta-card .btn-primary:hover { background: rgba(255,255,255,.9); }
.ls-cta-sub { text-align: center; font-size: var(--text-xs); margin: var(--space-2) 0 0 0; }
.ls-cta-sub a { color: rgba(255,255,255,.8); text-decoration: underline; }
.w-full { width: 100%; }


/* Pinned annotation task */
.annot-card-pinned { border-color: var(--color-primary-200); background: linear-gradient(180deg, var(--color-primary-50) 0%, var(--color-surface) 48px); }
.badge-pin { background: var(--color-primary); color: #fff; font-size: 11px; padding: 2px 8px; vertical-align: middle; }
.badge-pin i { width: 12px; height: 12px; vertical-align: -2px; }


/* Annotation action bar */
.annot-action-bar { padding: var(--space-3) var(--space-4); background: var(--color-slate-50); border: 1px solid var(--color-border); border-radius: var(--radius-lg); margin-bottom: var(--space-4); }


/* Admin annotation table: task name column wider */
#view-annotation .data-table td:first-child,
#view-annotation .data-table th:first-child { min-width: 280px; }
#view-annotation .data-table td:first-child .font-semibold { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 260px; display: block; }