/* AI overview page (ai.html) — hub layout, module cards, viz demos */

.hero {
  text-align: center;
  padding: 72px 20px 52px;
  position: relative;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 700px;
  background: radial-gradient(
    ellipse,
    color-mix(in srgb, var(--purple) 13%, transparent) 0%,
    color-mix(in srgb, var(--cyan) 5%, transparent) 45%,
    transparent 70%
  );
  z-index: 0;
  pointer-events: none;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 40%, transparent 100%);
  z-index: 0;
}
.hero > * { position: relative; z-index: 1; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: color-mix(in srgb, var(--cyan) 8%, transparent);
  color: var(--cyan);
  border: 1px solid color-mix(in srgb, var(--cyan) 22%, transparent);
  border-radius: 100px;
  font-size: 11px;
  font-weight: 700;
  font-family: var(--mono);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero-eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

.hero-title {
  font-family: var(--display);
  font-size: clamp(34px, 6vw, 58px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 22px;
  letter-spacing: -0.5px;
}
.hero-title .t1 { color: var(--text); }
.hero-title .t2 {
  background: linear-gradient(100deg, var(--purple) 0%, var(--cyan) 60%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  color: var(--text3);
  max-width: 560px;
  margin: 0 auto 36px;
  font-size: 16px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
  margin: 0 auto 36px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 16px;
  max-width: 520px;
  overflow: hidden;
}
.hstat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 18px 12px;
  border-right: 1px solid var(--border);
  min-width: 100px;
}
.hstat:last-child { border-right: none; }
.hstat-num {
  font-family: var(--display);
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  margin-bottom: 4px;
}
.hstat-num.cyan { color: var(--cyan); }
.hstat-num.purple { color: var(--purple); }
.hstat-num.green { color: var(--green); }
.hstat-num.pink { color: var(--pink); }
.hstat-lbl {
  font-size: 10px;
  color: var(--text3);
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 1.2px;
}

.hero-ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}
.cta-primary {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: var(--text);
  box-shadow: 0 4px 20px color-mix(in srgb, var(--purple) 35%, transparent);
}
.cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px color-mix(in srgb, var(--purple) 50%, transparent);
}
.cta-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border2);
}
.cta-secondary:hover {
  background: var(--surface);
  border-color: var(--border2);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 48px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.section-header-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.si-purple { background: color-mix(in srgb, var(--purple) 15%, transparent); }
.si-cyan { background: color-mix(in srgb, var(--cyan) 12%, transparent); }
.si-pink { background: color-mix(in srgb, var(--pink) 12%, transparent); }
.si-green { background: color-mix(in srgb, var(--green) 10%, transparent); }
.section-header-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}
.section-header-sub { font-size: 12px; color: var(--text3); margin-top: 2px; }

.path-flow {
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  padding: 4px 0 16px;
  margin-bottom: 8px;
  scrollbar-width: thin;
  gap: 0;
}
.path-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 110px;
  flex-shrink: 0;
}
.path-connector {
  display: flex;
  align-items: center;
  padding-top: 22px;
  color: var(--border2);
  flex-shrink: 0;
  font-size: 18px;
}
.pn-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  border: 2px solid var(--border);
  background: var(--surface);
  margin-bottom: 8px;
  transition: all 0.2s;
}
.pn-num {
  font-size: 10px;
  font-family: var(--mono);
  font-weight: 700;
  color: var(--text3);
  margin-bottom: 4px;
}
.pn-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text);
  text-align: center;
  max-width: 90px;
  line-height: 1.3;
}
.pn-start .pn-circle {
  border-color: var(--purple);
  background: color-mix(in srgb, var(--purple) 12%, transparent);
}
.pn-end .pn-circle {
  border-color: var(--cyan);
  background: color-mix(in srgb, var(--cyan) 12%, transparent);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 8px;
}
.module-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  text-decoration: none;
  transition: all 0.22s ease;
  position: relative;
  overflow: hidden;
}
.module-card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.22s ease;
  pointer-events: none;
}
.mc-purple { border-top: 2px solid var(--purple); }
.mc-purple::before {
  background: radial-gradient(ellipse at 50% 0%, color-mix(in srgb, var(--purple) 9%, transparent) 0%, transparent 70%);
}
.mc-cyan { border-top: 2px solid var(--cyan); }
.mc-cyan::before {
  background: radial-gradient(ellipse at 50% 0%, color-mix(in srgb, var(--cyan) 8%, transparent) 0%, transparent 70%);
}
.mc-pink { border-top: 2px solid var(--pink); }
.mc-pink::before {
  background: radial-gradient(ellipse at 50% 0%, color-mix(in srgb, var(--pink) 8%, transparent) 0%, transparent 70%);
}
.mc-green { border-top: 2px solid var(--green); }
.mc-green::before {
  background: radial-gradient(ellipse at 50% 0%, color-mix(in srgb, var(--green) 7%, transparent) 0%, transparent 70%);
}
.mc-amber { border-top: 2px solid var(--amber); }
.mc-amber::before {
  background: radial-gradient(ellipse at 50% 0%, color-mix(in srgb, var(--amber) 8%, transparent) 0%, transparent 70%);
}
.mc-blue { border-top: 2px solid var(--blue); }
.mc-blue::before {
  background: radial-gradient(ellipse at 50% 0%, color-mix(in srgb, var(--blue) 8%, transparent) 0%, transparent 70%);
}
.module-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  border-color: var(--border2);
}
.module-card:hover::before { opacity: 1; }

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 14px;
}
.card-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--surface2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.card-difficulty {
  font-size: 10px;
  font-family: var(--mono);
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 100px;
  letter-spacing: 0.8px;
}
.diff-beginner { background: color-mix(in srgb, var(--green) 10%, transparent); color: var(--green); }
.diff-intermediate { background: color-mix(in srgb, var(--amber) 10%, transparent); color: var(--amber); }
.diff-advanced { background: color-mix(in srgb, var(--pink) 10%, transparent); color: var(--pink); }

.card-name { font-size: 17px; font-weight: 700; color: var(--text); margin-bottom: 8px; line-height: 1.3; }
.card-desc { font-size: 13px; color: var(--text2); line-height: 1.6; margin-bottom: 16px; flex: 1; }
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.card-tag {
  font-size: 10px;
  font-family: var(--mono);
  padding: 3px 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text3);
}
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.card-meta { font-size: 11px; color: var(--text3); font-family: var(--mono); }
.card-arrow { font-size: 13px; color: var(--text3); transition: transform 0.2s, color 0.2s; }
.module-card:hover .card-arrow { transform: translateX(4px); color: var(--cyan); }

.viz-section { margin: 16px 0 48px; }
.viz-section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}
.viz-section-title {
  font-family: var(--display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
}
.viz-section-sub { font-size: 13px; color: var(--text2); margin-top: 4px; }
.viz-count-badge {
  font-size: 11px;
  font-family: var(--mono);
  color: var(--cyan);
  background: color-mix(in srgb, var(--cyan) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--cyan) 20%, transparent);
  padding: 4px 10px;
  border-radius: 100px;
  white-space: nowrap;
}
.viz-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 20px; }
.vtab {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text3);
  padding: 7px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all 0.18s;
}
.vtab:hover { background: var(--surface2); color: var(--text); border-color: var(--border2); }
.vtab.active {
  background: color-mix(in srgb, var(--purple) 12%, transparent);
  color: var(--purple);
  border-color: color-mix(in srgb, var(--purple) 40%, transparent);
}
.viz-panel { display: none; }
.viz-panel.active { display: block; animation: fadeSlide 0.28s ease; }
@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.viz-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
.viz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  flex-wrap: wrap;
  gap: 10px;
}
.viz-title-wrap { display: flex; align-items: center; gap: 10px; }
.viz-dot { width: 8px; height: 8px; border-radius: 50%; }
.viz-name {
  font-weight: 700;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text);
}
.viz-tag {
  font-size: 10px;
  font-family: var(--mono);
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--surface2);
  color: var(--text3);
  border: 1px solid var(--border);
}
.viz-controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.viz-btn {
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text);
  padding: 6px 13px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 12px;
  font-family: var(--sans);
  font-weight: 600;
  transition: all 0.18s;
}
.viz-btn:hover { background: var(--surface); border-color: var(--border2); }
.viz-btn.primary {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: var(--text);
  border: none;
  box-shadow: 0 2px 12px color-mix(in srgb, var(--purple) 30%, transparent);
}
.viz-btn.primary:hover {
  box-shadow: 0 4px 18px color-mix(in srgb, var(--purple) 50%, transparent);
  transform: translateY(-1px);
}
.viz-body { padding: 20px; }
.viz-canvas {
  width: 100%;
  max-height: 340px;
  border-radius: 10px;
  background: var(--bg2);
  border: 1px solid var(--border);
  display: block;
}
@media (max-width: 600px) {
  .viz-canvas { max-height: 220px; }
}
.viz-info {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text2);
  font-size: 13px;
  line-height: 1.65;
}
.viz-info strong { color: var(--text); }
.viz-info code {
  font-family: var(--mono);
  font-size: 12px;
  background: color-mix(in srgb, var(--purple) 12%, transparent);
  color: var(--purple);
  padding: 2px 6px;
  border-radius: 4px;
}
.lr-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text3);
  font-family: var(--mono);
}
input[type="range"] { accent-color: var(--purple); }

.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border2), transparent);
  margin: 48px 0;
}

.page-wrap { max-width: 1020px; margin: 0 auto; padding: 0 20px 60px; }

@media (max-width: 600px) {
  .hstat { padding: 14px 8px; min-width: 72px; }
  .hstat-num { font-size: 20px; }
  .hero-title { font-size: clamp(18px, 5vw, 24px) !important; letter-spacing: -0.5px; }
  .module-card.wide-card { flex-direction: column !important; }
}