@import url("https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Noto+Sans+SC:wght@400;500;600;700;800&family=Sora:wght@400;500;600;700;800&display=swap");

:root {
  color-scheme: dark;
  --ai-bg: #050914;
  --ai-bg-soft: #0a0f1e;
  --ai-panel: rgba(15, 23, 42, 0.8);
  --ai-panel-strong: #0f172a;
  --ai-panel-hover: rgba(22, 39, 55, 0.9);
  --ai-text: #f1f5f9;
  --ai-muted: #94a3b8;
  --ai-line: rgba(148, 163, 184, 0.12);
  --ai-line-strong: rgba(148, 163, 184, 0.25);

  /* Semantic accent colors - Purple (Agent) → Blue (Tool) → Green (Silicon) */
  --ai-accent: #a78bfa;           /* Purple - primary accent */
  --ai-accent-2: #38bdf8;         /* Sky blue - secondary */
  --ai-accent-3: #34d399;         /* Emerald - tertiary */

  /* Layer-specific semantic colors */
  --ai-agent: #a78bfa;            /* Purple for Agent-related */
  --ai-tool: #38bdf8;             /* Blue for EDA tools */
  --ai-silicon: #34d399;          /* Green for silicon/tape-out */
  --ai-warning: #fbbf24;
  --ai-error: #f87171;

  --ai-shadow: 0 26px 70px rgba(0, 0, 0, 0.4);
  --ai-radius: 22px;
  --ai-max: 72%;
  --ai-font-display: "Sora", "Noto Sans SC", sans-serif;
  --ai-font-body: "Noto Sans SC", "Sora", sans-serif;
  --ai-font-mono: "JetBrains Mono", monospace;
}

html[data-theme="light"] {
  color-scheme: light;
  --ai-bg: #f8fafc;
  --ai-bg-soft: #ffffff;
  --ai-panel: rgba(255, 255, 255, 0.8);
  --ai-panel-strong: #ffffff;
  --ai-panel-hover: #ffffff;
  --ai-text: #0f172a;
  --ai-muted: #64748b;
  --ai-line: rgba(100, 116, 139, 0.12);
  --ai-line-strong: rgba(100, 116, 139, 0.25);
  --ai-accent: #7c3aed;
  --ai-accent-2: #0284c7;
  --ai-accent-3: #059669;
  --ai-agent: #7c3aed;
  --ai-tool: #0284c7;
  --ai-silicon: #059669;
  --ai-warning: #d97706;
  --ai-error: #dc2626;
  --ai-shadow: 0 26px 70px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }
html { overflow-x: clip; scroll-behavior: smooth; background: var(--ai-bg); }
body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 10% -10%, rgba(56, 189, 248, 0.13), transparent 32rem),
    radial-gradient(circle at 95% 5%, rgba(167, 139, 250, 0.12), transparent 34rem),
    var(--ai-bg);
  color: var(--ai-text);
  font-family: var(--ai-font-body);
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  z-index: -3;
  inset: 0;
  background-image:
    linear-gradient(var(--ai-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--ai-line) 1px, transparent 1px);
  background-size: 54px 54px;
  content: "";
  opacity: 0.32;
  pointer-events: none;
  mask-image: linear-gradient(to bottom, #000 0, transparent 78%);
}

body::after {
  position: fixed;
  z-index: -2;
  top: -18rem;
  left: 50%;
  width: 65rem;
  height: 40rem;
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 55%, rgba(167, 139, 250, 0.22), transparent 36%),
    radial-gradient(circle at 68% 48%, rgba(56, 189, 248, 0.18), transparent 38%);
  content: "";
  filter: blur(38px);
  pointer-events: none;
  transform: translateX(-50%);
  animation: ai-aurora 13s ease-in-out infinite alternate;
}

a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; font: inherit; }
img { display: block; max-width: 100%; }

.ai-skip {
  position: fixed;
  z-index: 1000;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  border-radius: 10px;
  background: var(--ai-accent);
  color: #03130d;
  font-weight: 700;
  transform: translateY(-160%);
}
.ai-skip:focus { transform: translateY(0); }

.ai-nav {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid var(--ai-line);
  background: color-mix(in srgb, var(--ai-bg) 78%, transparent);
  backdrop-filter: blur(22px) saturate(150%);
}
.ai-nav-inner, .ai-wrap {
  width: min(var(--ai-max), calc(100% - 2.5rem));
  max-width: 100%;
  margin-inline: auto;
}
.ai-nav-inner {
  display: flex;
  min-height: 72px;
  align-items: center;
  gap: 1.2rem;
}
.ai-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--ai-font-display);
  font-weight: 800;
  letter-spacing: -0.04em;
}
.ai-brand img { width: auto; height: 34px; max-width: 168px; object-fit: contain; }
.ai-brand .ai-brand-mark--light { display: none; }
html[data-theme="light"] .ai-brand .ai-brand-mark--dark { display: none; }
html[data-theme="light"] .ai-brand .ai-brand-mark--light { display: block; }
.ai-brand span { font-size: 1.18rem; }
.ai-brand em {
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.65rem;
  font-style: normal;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ai-nav-links {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
}
.ai-nav-links a {
  padding: 0.48rem 0.72rem;
  border-radius: 10px;
  color: var(--ai-muted);
  font-size: 0.86rem;
  font-weight: 600;
  transition: 180ms ease;
}
.ai-nav-links a:hover, .ai-nav-links a[aria-current="page"] {
  background: var(--ai-panel);
  color: var(--ai-text);
}
.ai-nav-actions { display: flex; flex: 0 0 auto; align-items: center; gap: 0.45rem; }
.ai-icon-button, .ai-language {
  display: inline-grid;
  min-width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid var(--ai-line);
  border-radius: 12px;
  background: var(--ai-panel);
  color: var(--ai-muted);
  cursor: pointer;
  font-family: var(--ai-font-mono);
  font-size: 0.75rem;
  transition: 180ms ease;
}
.ai-language { padding-inline: 0.72rem; }
.ai-icon-button.ai-github {
  color: var(--ai-muted);
}
.ai-icon-button .ai-github-mark {
  display: block;
  width: 18px;
  height: 18px;
}
.ai-icon-button:hover, .ai-language:hover {
  border-color: var(--ai-line-strong);
  color: var(--ai-text);
  transform: translateY(-1px);
}
.ai-menu-button { display: none; }

.ai-main { min-height: 72vh; }
.ai-hero { position: relative; padding: clamp(5rem, 11vw, 9.5rem) 0 clamp(4rem, 8vw, 7rem); }
.ai-hero::before {
  position: absolute;
  top: 14%;
  right: -5%;
  width: 26rem;
  height: 26rem;
  border: 1px solid var(--ai-line);
  border-radius: 50%;
  box-shadow:
    inset 0 0 0 2.4rem rgba(167, 139, 250, 0.015),
    inset 0 0 0 5rem rgba(56, 189, 248, 0.018);
  content: "";
  opacity: 0.72;
  pointer-events: none;
}
.ai-hero-grid {
  display: grid;
  align-items: center;
  gap: clamp(2.8rem, 7vw, 6rem);
  grid-template-columns: minmax(0, 1.08fr) minmax(330px, 0.92fr);
}
.ai-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.25rem;
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.ai-eyebrow::before { width: 28px; height: 1px; background: currentColor; content: ""; }
.ai-hero h1 {
  max-width: 920px;
  margin: 0;
  font-family: var(--ai-font-display);
  font-size: clamp(3rem, 7vw, 6.8rem);
  font-weight: 800;
  letter-spacing: -0.065em;
  line-height: 0.98;
}
.ai-hero h1 .ai-gradient, .ai-gradient {
  background: linear-gradient(105deg, var(--ai-accent), var(--ai-accent-2) 52%, var(--ai-accent-3));
  background-clip: text;
  color: transparent;
  -webkit-background-clip: text;
}
.ai-lead {
  max-width: 720px;
  margin: 1.65rem 0 0;
  color: var(--ai-muted);
  font-size: clamp(1.03rem, 1.6vw, 1.22rem);
}
.ai-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2rem; }
.ai-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.15rem;
  border: 1px solid var(--ai-line-strong);
  border-radius: 13px;
  background: var(--ai-panel);
  font-family: var(--ai-font-display);
  font-size: 0.9rem;
  font-weight: 700;
  transition: 180ms ease;
}
.ai-button:hover {
  border-color: var(--ai-accent);
  box-shadow: 0 12px 34px rgba(56, 189, 248, 0.1);
  transform: translateY(-2px);
}
.ai-button.primary { border-color: transparent; background: var(--ai-accent); color: #04120d; }
.ai-button.primary:hover {
  background: color-mix(in srgb, var(--ai-accent) 88%, white);
  box-shadow: 0 12px 36px color-mix(in srgb, var(--ai-accent) 24%, transparent);
}
.ai-inline-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.25rem;
  margin-top: 2rem;
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.73rem;
}
.ai-inline-facts span::before { margin-right: 0.55rem; color: var(--ai-accent); content: "●"; font-size: 0.52rem; }

.ai-terminal {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ai-line-strong);
  border-radius: var(--ai-radius);
  background: rgba(5, 12, 17, 0.94);
  box-shadow: var(--ai-shadow), 0 0 60px rgba(56, 189, 248, 0.08);
  color: #bdd0ca;
  transform: perspective(1000px) rotateY(-2deg) rotateX(1deg);
}
html[data-theme="light"] .ai-terminal { background: #0f172a; }
.ai-terminal-bar {
  display: flex;
  height: 45px;
  align-items: center;
  gap: 0.42rem;
  padding: 0 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.025);
}
.ai-terminal-bar i { width: 9px; height: 9px; border-radius: 50%; }
.ai-terminal-bar i:nth-child(1) { background: #ff5f57; }
.ai-terminal-bar i:nth-child(2) { background: #febc2e; }
.ai-terminal-bar i:nth-child(3) { background: #28c840; }
.ai-terminal-bar span {
  margin-left: 0.4rem;
  color: #688078;
  font-family: var(--ai-font-mono);
  font-size: 0.69rem;
}
.ai-terminal pre {
  min-height: 310px;
  margin: 0;
  overflow: auto;
  padding: 1.3rem;
  font-family: var(--ai-font-mono);
  font-size: clamp(0.7rem, 1vw, 0.82rem);
  line-height: 1.85;
  white-space: pre-wrap;
}
.ai-terminal .c { color: #64748b; }
.ai-terminal .p, .ai-terminal .ok { color: #a78bfa; }
.ai-terminal .k { color: #38bdf8; }
.ai-terminal .v { color: #34d399; }

.ai-marquee {
  overflow: hidden;
  border-block: 1px solid var(--ai-line);
  background: rgba(255, 255, 255, 0.012);
}
.ai-marquee-track { display: flex; width: max-content; animation: ai-marquee 30s linear infinite; }
.ai-marquee span {
  padding: 1rem 1.35rem;
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.78rem;
  white-space: nowrap;
}
.ai-marquee b { margin-right: 0.4rem; color: var(--ai-text); }

.ai-section { position: relative; padding: clamp(4.5rem, 8vw, 7.5rem) 0; }
.ai-section.tint {
  border-block: 1px solid var(--ai-line);
  background: linear-gradient(180deg, transparent, rgba(167, 139, 250, 0.025), transparent);
}
.ai-section-heading { display: grid; max-width: 860px; gap: 0.8rem; margin-bottom: 2.4rem; }
.ai-section-heading.center { margin-inline: auto; text-align: center; }
.ai-section-heading.center .ai-eyebrow { justify-content: center; }
.ai-section-heading h2 {
  margin: 0;
  font-family: var(--ai-font-display);
  font-size: clamp(2rem, 4.5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1.05;
}
.ai-section-heading p { margin: 0; color: var(--ai-muted); font-size: 1.02rem; }

.ai-metrics {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--ai-line);
  border-radius: var(--ai-radius);
  background: var(--ai-panel);
  grid-template-columns: repeat(4, 1fr);
}
.ai-metric { min-height: 150px; padding: 1.5rem; border-right: 1px solid var(--ai-line); }
.ai-metric:last-child { border-right: 0; }
.ai-metric strong {
  display: block;
  color: var(--ai-accent);
  font-family: var(--ai-font-display);
  font-size: clamp(2rem, 4vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1;
}
.ai-metric span { display: block; margin-top: 0.8rem; color: var(--ai-muted); font-size: 0.83rem; }

.ai-bento { display: grid; gap: 1rem; grid-template-columns: repeat(12, 1fr); }
.ai-card {
  position: relative;
  min-height: 240px;
  overflow: hidden;
  padding: clamp(1.35rem, 2.7vw, 2rem);
  border: 1px solid var(--ai-line);
  border-radius: var(--ai-radius);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.035), transparent 45%),
    var(--ai-panel);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.06);
  grid-column: span 4;
  transition: 220ms ease;
}
.ai-card:hover {
  border-color: var(--ai-line-strong);
  background:
    linear-gradient(145deg, rgba(167, 139, 250, 0.06), transparent 45%),
    var(--ai-panel-hover);
  box-shadow: var(--ai-shadow);
  transform: translateY(-4px);
}
.ai-card.wide { grid-column: span 8; }
.ai-card.half { grid-column: span 6; }
.ai-card.full { grid-column: 1 / -1; }
.ai-card.accent {
  background:
    radial-gradient(circle at 100% 0, rgba(56, 189, 248, 0.18), transparent 45%),
    linear-gradient(135deg, rgba(167, 139, 250, 0.09), transparent 54%),
    var(--ai-panel);
}
.ai-card-index {
  display: flex;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  margin-bottom: 2rem;
  border: 1px solid var(--ai-line-strong);
  border-radius: 12px;
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.69rem;
}
.ai-card .ai-pill {
  display: inline-flex;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--ai-line-strong);
  border-radius: 999px;
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ai-card h3 {
  margin: 0.85rem 0 0.6rem;
  font-family: var(--ai-font-display);
  font-size: clamp(1.15rem, 2vw, 1.55rem);
  letter-spacing: -0.035em;
  line-height: 1.2;
}
.ai-card p { margin: 0; color: var(--ai-muted); font-size: 0.91rem; }
.ai-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1.25rem;
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
}
.ai-card-link::after { content: "↗"; transition: transform 160ms ease; }
.ai-card:hover .ai-card-link::after { transform: translate(2px, -2px); }

.ai-flow {
  display: grid;
  gap: 0;
  border: 1px solid var(--ai-line);
  border-radius: var(--ai-radius);
  background: var(--ai-panel);
  grid-template-columns: repeat(4, 1fr);
}
.ai-flow-step {
  position: relative;
  min-height: 170px;
  padding: 1.35rem;
  border-right: 1px solid var(--ai-line);
  border-bottom: 1px solid var(--ai-line);
  color: inherit;
  text-decoration: none;
  transition: background 180ms ease;
}
a.ai-flow-step:hover { background: rgba(167, 139, 250, 0.04); }
.ai-flow-step:nth-child(4n) { border-right: 0; }
.ai-flow-step:nth-last-child(-n + 4) { border-bottom: 0; }
.ai-flow-step small { color: var(--ai-accent); font-family: var(--ai-font-mono); }
.ai-flow-step h3 { margin: 1.2rem 0 0.4rem; font-family: var(--ai-font-display); font-size: 1.04rem; }
.ai-flow-step p { margin: 0; color: var(--ai-muted); font-size: 0.78rem; }

.ai-timeline { display: grid; border-top: 1px solid var(--ai-line); }
.ai-timeline-row {
  display: grid;
  align-items: center;
  gap: 1.2rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--ai-line);
  grid-template-columns: 110px 1fr auto;
  transition: 180ms ease;
}
.ai-timeline-row:hover { padding-inline: 0.8rem; background: rgba(167, 139, 250, 0.025); }
.ai-timeline-row time, .ai-timeline-row em {
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.7rem;
  font-style: normal;
}
.ai-timeline-row h3 { margin: 0; font-family: var(--ai-font-display); font-size: 1rem; }
.ai-timeline-row p { margin: 0.25rem 0 0; color: var(--ai-muted); font-size: 0.82rem; }
.ai-timeline-row > span { color: var(--ai-muted); }

.ai-code-panel {
  padding: 1.4rem;
  border: 1px solid var(--ai-line);
  border-radius: var(--ai-radius);
  background: #050914;
  color: #94a3b8;
  font-family: var(--ai-font-mono);
  font-size: 0.8rem;
  line-height: 1.9;
}
.ai-code-panel b { color: #a78bfa; }

.ai-cta { padding: clamp(4rem, 8vw, 7rem) 0; }
.ai-cta-box {
  position: relative;
  overflow: hidden;
  padding: clamp(2rem, 6vw, 5rem);
  border: 1px solid var(--ai-line-strong);
  border-radius: 32px;
  background:
    radial-gradient(circle at 15% 20%, rgba(167, 139, 250, 0.18), transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(56, 189, 248, 0.15), transparent 38%),
    var(--ai-panel-strong);
  text-align: center;
}
.ai-cta-box h2 {
  max-width: 800px;
  margin: 0 auto;
  font-family: var(--ai-font-display);
  font-size: clamp(2rem, 5vw, 4.2rem);
  letter-spacing: -0.055em;
  line-height: 1.06;
}
.ai-cta-box p { max-width: 660px; margin: 1rem auto 0; color: var(--ai-muted); }
.ai-cta-box .ai-actions { justify-content: center; }

.ai-footer {
  padding: 4.5rem 0 1.5rem;
  border-top: 1px solid var(--ai-line);
  background: rgba(3, 8, 11, 0.5);
}
html[data-theme="light"] .ai-footer { background: rgba(241, 245, 249, 0.5); }
.ai-footer-grid { display: grid; gap: 2rem; grid-template-columns: 1.7fr repeat(4, 1fr); }
.ai-footer-brand p { max-width: 340px; color: var(--ai-muted); font-size: 0.85rem; }
.ai-footer-col h3 {
  margin: 0 0 0.8rem;
  font-family: var(--ai-font-display);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
}
.ai-footer-col a { display: block; margin: 0.45rem 0; color: var(--ai-muted); font-size: 0.78rem; }
.ai-footer-col a:hover { color: var(--ai-accent); }
.ai-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--ai-line);
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.65rem;
}

.ai-reveal {
  opacity: 1;
  transform: none;
}
.ai-reveal.visible { animation: ai-reveal-in 650ms cubic-bezier(0.22, 1, 0.36, 1) both; }

.ai-not-found {
  display: grid;
  min-height: calc(100vh - 72px);
  place-items: center;
  text-align: center;
}
.ai-not-found-code {
  background: linear-gradient(110deg, var(--ai-accent), var(--ai-accent-2));
  background-clip: text;
  color: transparent;
  font-family: var(--ai-font-display);
  font-size: clamp(7rem, 22vw, 18rem);
  font-weight: 800;
  letter-spacing: -0.1em;
  line-height: 0.8;
}
.ai-not-found h1 { margin: 2rem 0 0.5rem; font-family: var(--ai-font-display); font-size: clamp(1.8rem, 4vw, 3.2rem); }
.ai-not-found p { max-width: 560px; margin: 0 auto; color: var(--ai-muted); }

:focus-visible { outline: 2px solid var(--ai-accent); outline-offset: 3px; }

@keyframes ai-aurora {
  from { transform: translateX(-52%) rotate(-3deg) scale(0.95); }
  to { transform: translateX(-48%) rotate(4deg) scale(1.08); }
}
@keyframes ai-marquee { to { transform: translateX(-50%); } }
@keyframes ai-reveal-in {
  from { opacity: 0.35; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1020px) {
  .ai-nav-links {
    position: fixed;
    top: 72px;
    right: 1rem;
    left: 1rem;
    display: none;
    padding: 1rem;
    border: 1px solid var(--ai-line-strong);
    border-radius: 18px;
    background: var(--ai-panel-strong);
    box-shadow: var(--ai-shadow);
  }
  .ai-nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
  .ai-menu-button { display: inline-grid; }
  .ai-hero-grid { grid-template-columns: 1fr; }
  .ai-terminal { max-width: 720px; transform: none; }
  .ai-card, .ai-card.wide { grid-column: span 6; }
  .ai-metrics, .ai-flow { grid-template-columns: repeat(2, 1fr); }
  .ai-metric:nth-child(2) { border-right: 0; }
  .ai-metric:nth-child(-n + 2) { border-bottom: 1px solid var(--ai-line); }
  .ai-flow-step:nth-child(2n) { border-right: 0; }
  .ai-flow-step:nth-child(4n) { border-right: 1px solid var(--ai-line); }
  .ai-flow-step:nth-last-child(-n + 4) { border-bottom: 1px solid var(--ai-line); }
  .ai-flow-step:nth-last-child(-n + 2) { border-bottom: 0; }
  .ai-footer-grid { grid-template-columns: 1.5fr repeat(2, 1fr); }
}

@media (max-width: 680px) {
  .ai-nav-inner, .ai-wrap { width: min(var(--ai-max), calc(100% - 1.4rem)); }
  .ai-brand em, .ai-language { display: none; }
  .ai-hero { padding-top: 4.6rem; }
  .ai-hero h1 { font-size: clamp(2.65rem, 15vw, 4.3rem); }
  .ai-terminal pre { min-height: 260px; }
  .ai-metrics, .ai-flow { grid-template-columns: 1fr; }
  .ai-metric, .ai-metric:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--ai-line); }
  .ai-metric:last-child { border-bottom: 0; }
  .ai-card, .ai-card.wide, .ai-card.half { grid-column: 1 / -1; }
  .ai-flow-step,
  .ai-flow-step:nth-child(4n),
  .ai-flow-step:nth-child(2n),
  .ai-flow-step:nth-last-child(-n + 4) { border-right: 0; border-bottom: 1px solid var(--ai-line); }
  .ai-flow-step:last-child { border-bottom: 0; }
  .ai-timeline-row { grid-template-columns: 1fr auto; }
  .ai-timeline-row time { grid-column: 1 / -1; }
  .ai-footer-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-footer-brand { grid-column: 1 / -1; }
  .ai-footer-bottom { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .ai-reveal { opacity: 1; transform: none; }
}

/* ——— Phase 2: motion + doc shell ——— */
.ai-progress {
  position: fixed;
  z-index: 120;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--ai-accent), var(--ai-accent-2), var(--ai-accent-3));
  box-shadow: 0 0 12px rgba(167, 139, 250, 0.55);
  pointer-events: none;
  transform-origin: left center;
}

.ai-spotlight {
  position: fixed;
  z-index: -1;
  width: 28rem;
  height: 28rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(167, 139, 250, 0.12), transparent 68%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 280ms ease;
  transform: translate(-50%, -50%);
}
html[data-theme="light"] .ai-spotlight {
  background: radial-gradient(circle, rgba(15, 159, 102, 0.1), transparent 68%);
}
body.is-pointer-ready .ai-spotlight { opacity: 1; }

.ai-reveal {
  opacity: 0;
  transform: translateY(22px);
}
.ai-reveal.visible {
  opacity: 1;
  transform: none;
  animation: ai-reveal-in 720ms cubic-bezier(0.22, 1, 0.36, 1) both;
}
.ai-reveal[data-delay="1"].visible { animation-delay: 60ms; }
.ai-reveal[data-delay="2"].visible { animation-delay: 120ms; }
.ai-reveal[data-delay="3"].visible { animation-delay: 180ms; }
.ai-reveal[data-delay="4"].visible { animation-delay: 240ms; }
.ai-reveal[data-delay="5"].visible { animation-delay: 300ms; }

.ai-card {
  transition: transform 280ms ease, border-color 280ms ease, background 280ms ease, box-shadow 280ms ease;
}
.ai-card:hover {
  transform: translateY(-4px);
  border-color: var(--ai-line-strong);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22), 0 0 0 1px rgba(167, 139, 250, 0.08);
}
.ai-terminal {
  transition: transform 400ms ease, box-shadow 400ms ease;
}
.ai-terminal:hover {
  transform: translateY(-2px) rotate(-0.4deg);
  box-shadow: var(--ai-shadow), 0 0 0 1px rgba(167, 139, 250, 0.18);
}
.ai-button.primary {
  position: relative;
  overflow: hidden;
}
.ai-button.primary::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.28), transparent 70%);
  content: "";
  transform: translateX(-120%);
  transition: transform 650ms ease;
}
.ai-button.primary:hover::after { transform: translateX(120%); }

.ai-metric strong[data-count] {
  font-variant-numeric: tabular-nums;
}

.ai-doc-hero {
  padding: 4.2rem 0 1.8rem;
  border-bottom: 1px solid var(--ai-line);
  background:
    linear-gradient(180deg, rgba(167, 139, 250, 0.05), transparent 70%),
    transparent;
}
.ai-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.55rem;
  margin: 0 0 1.1rem;
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.02em;
}
.ai-breadcrumb a:hover { color: var(--ai-accent); }
.ai-breadcrumb span { opacity: 0.55; }
.ai-doc-hero h1 {
  margin: 0.35rem 0 0.75rem;
  font-family: var(--ai-font-display);
  font-size: clamp(1.8rem, 4vw, 2.85rem);
  font-weight: 750;
  letter-spacing: -0.035em;
  line-height: 1.15;
}
.ai-doc-hero .ai-lead {
  max-width: 46rem;
  margin: 0;
  color: var(--ai-muted);
  font-size: 1.02rem;
}
.ai-doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.25rem;
}
.ai-doc-meta span {
  padding: 0.28rem 0.65rem;
  border: 1px solid var(--ai-line);
  border-radius: 999px;
  background: rgba(167, 139, 250, 0.05);
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.65rem;
}

.ai-doc-layout {
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1fr) 15.5rem;
  align-items: start;
  padding: 2.4rem 0 4.5rem;
}
/* Safety: if a page forgets .ai-wrap, still constrain full-bleed layouts */
.ai-main > .ai-doc-layout {
  width: min(var(--ai-max), calc(100% - 2.5rem));
  max-width: 100%;
  margin-inline: auto;
}
.ai-doc-layout.no-toc { grid-template-columns: minmax(0, 1fr); }
.ai-toc {
  position: sticky;
  top: 5.4rem;
  max-height: calc(100vh - 6.5rem);
  overflow: auto;
  padding: 1rem;
  border: 1px solid var(--ai-line);
  border-radius: 16px;
  background: var(--ai-panel);
  backdrop-filter: blur(14px);
  order: 2;
}
.ai-toc h2 {
  margin: 0 0 0.75rem;
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ai-toc a {
  display: block;
  margin: 0.28rem 0;
  color: var(--ai-muted);
  font-size: 0.78rem;
  line-height: 1.35;
  border-left: 2px solid transparent;
  padding-left: 0.65rem;
  transition: color 180ms ease, border-color 180ms ease;
}
.ai-toc a.level-3 { padding-left: 1.15rem; font-size: 0.72rem; opacity: 0.88; }
.ai-toc a:hover,
.ai-toc a.active {
  color: var(--ai-accent);
  border-left-color: var(--ai-accent);
}

.ai-doc {
  min-width: 0;
  padding: 1.55rem 1.7rem 2rem;
  border: 1px solid var(--ai-line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--ai-panel-strong) 88%, transparent);
  box-shadow: var(--ai-shadow);
}
.ai-doc > :first-child { margin-top: 0; }
.ai-doc h1, .ai-doc h2, .ai-doc h3, .ai-doc h4 {
  font-family: var(--ai-font-display);
  letter-spacing: -0.02em;
  scroll-margin-top: 5.5rem;
}
.ai-doc h1 { font-size: 1.75rem; }
.ai-doc h2 {
  margin-top: 2.2rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--ai-line);
  font-size: 1.35rem;
}
.ai-doc h3 { margin-top: 1.5rem; font-size: 1.1rem; }
.ai-doc p, .ai-doc li { color: color-mix(in srgb, var(--ai-text) 92%, var(--ai-muted)); }
.ai-doc a { color: var(--ai-accent-2); text-decoration: underline; text-underline-offset: 0.18em; }
.ai-doc a:hover { color: var(--ai-accent); }
.ai-doc code {
  padding: 0.12rem 0.35rem;
  border-radius: 6px;
  background: rgba(167, 139, 250, 0.08);
  color: var(--ai-accent-3);
  font-family: var(--ai-font-mono);
  font-size: 0.86em;
}
.ai-doc pre {
  overflow: auto;
  padding: 1rem 1.1rem;
  border: 1px solid var(--ai-line);
  border-radius: 14px;
  background: #071018;
  color: #d7efe6;
  font-family: var(--ai-font-mono);
  font-size: 0.82rem;
  line-height: 1.55;
}
html[data-theme="light"] .ai-doc pre { background: #0f172a; }
.ai-doc pre code { padding: 0; background: transparent; color: inherit; }
.ai-doc table {
  display: block;
  overflow: auto;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.ai-doc th, .ai-doc td {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--ai-line);
  text-align: left;
}
.ai-doc th { background: rgba(167, 139, 250, 0.08); }
.ai-doc img, .ai-doc video {
  margin: 1rem auto;
  border: 1px solid var(--ai-line);
  border-radius: 14px;
}
.ai-doc blockquote {
  margin: 1rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--ai-accent);
  color: var(--ai-muted);
}
.ai-doc .header-anchor { color: transparent; margin-right: 0.15rem; }
.ai-doc h1:hover .header-anchor,
.ai-doc h2:hover .header-anchor,
.ai-doc h3:hover .header-anchor { color: var(--ai-accent); }
.ai-doc .katex { font-size: 1.05em; }
.ai-doc .katex-display { overflow-x: auto; overflow-y: hidden; padding: 0.4rem 0; }

.ai-child-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  margin-top: 1.4rem;
}
.ai-child-card {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 1.05rem;
  border: 1px solid var(--ai-line);
  border-radius: 16px;
  background: rgba(167, 139, 250, 0.03);
  transition: transform 220ms ease, border-color 220ms ease, background 220ms ease;
}
.ai-child-card:hover {
  transform: translateY(-3px);
  border-color: var(--ai-line-strong);
  background: rgba(167, 139, 250, 0.07);
}
.ai-child-card strong {
  font-family: var(--ai-font-display);
  font-size: 0.95rem;
}
.ai-child-card span {
  color: var(--ai-muted);
  font-size: 0.78rem;
}

.ai-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.2rem 0 1.6rem;
}
.ai-tab {
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--ai-line);
  border-radius: 999px;
  background: transparent;
  color: var(--ai-muted);
  cursor: pointer;
  transition: all 180ms ease;
}
.ai-tab:hover, .ai-tab.active {
  border-color: var(--ai-line-strong);
  background: rgba(167, 139, 250, 0.1);
  color: var(--ai-text);
}
.ai-panel[hidden] { display: none !important; }

.ai-nav.scrolled {
  border-bottom-color: var(--ai-line-strong);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
}

@keyframes ai-pulse-line {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.9; }
}
.ai-inline-facts span::before {
  display: inline-block;
  width: 0.35rem;
  height: 0.35rem;
  margin-right: 0.45rem;
  border-radius: 50%;
  background: var(--ai-accent);
  content: "";
  vertical-align: middle;
  animation: ai-pulse-line 2.4s ease-in-out infinite;
}

@media (max-width: 1020px) {
  .ai-doc-layout { grid-template-columns: 1fr; }
  .ai-toc { position: relative; top: 0; order: 0; max-height: none; }
  .ai-doc { padding: 1.15rem 1rem 1.5rem; }
}
@media (prefers-reduced-motion: reduce) {
  .ai-spotlight, .ai-progress { display: none !important; }
  .ai-card:hover, .ai-terminal:hover, .ai-child-card:hover { transform: none; }
  .ai-reveal { opacity: 1; transform: none; }
}


.ai-doc-hero-lite.ai-hero { padding-top: 3.2rem; padding-bottom: 1.2rem; }
.ai-doc-hero-lite .ai-hero-grid { align-items: end; }
.ai-doc-hero-lite h1 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  letter-spacing: -0.03em;
}
.ai-doc-hero-lite .ai-terminal { max-width: 420px; }
.ai-doc-hero-lite .ai-terminal pre { min-height: 180px; font-size: 0.72rem; }
.ai-breadcrumb { margin-bottom: 0.85rem; }


.ai-sidetree {
  position: sticky;
  top: 5.4rem;
  max-height: calc(100vh - 6.5rem);
  overflow: auto;
  padding: 1rem;
  border: 1px solid var(--ai-line);
  border-radius: 16px;
  background: var(--ai-panel);
  backdrop-filter: blur(14px);
  min-width: 15rem;
}
.ai-sidetree h2 {
  margin: 0 0 0.75rem;
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ai-sidetree .group {
  margin: 0.85rem 0 0.35rem;
  color: var(--ai-accent);
  font-size: 0.72rem;
  font-weight: 700;
}
.ai-sidetree a {
  display: block;
  margin: 0.22rem 0;
  padding: 0.2rem 0.45rem;
  border-radius: 8px;
  color: var(--ai-muted);
  font-size: 0.78rem;
  line-height: 1.35;
}
.ai-sidetree a:hover,
.ai-sidetree a.active {
  background: rgba(167, 139, 250, 0.1);
  color: var(--ai-accent);
}
.ai-doc-with-tree {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 15.5rem minmax(0, 1fr);
  align-items: start;
  padding: 1.5rem 0 3rem;
}
.ai-doc-with-tree .ai-doc-main { min-width: 0; }
.ai-doc-with-tree .ai-doc-layout { margin: 0; padding: 0; }
@media (max-width: 1020px) {
  .ai-doc-with-tree { grid-template-columns: 1fr; }
  .ai-sidetree { position: relative; top: 0; max-height: none; }
}
.ai-deep-list { display: none; } /* replaced by track board */

.ai-track-board {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-top: 1.4rem;
}
.ai-track {
  padding: 1.15rem 1.2rem 1.25rem;
  border: 1px solid var(--ai-line);
  border-radius: 20px;
  background:
    linear-gradient(160deg, rgba(167, 139, 250, 0.07), transparent 42%),
    var(--ai-panel);
  transition: border-color 200ms ease, transform 200ms ease;
}
.ai-track:hover {
  border-color: var(--ai-line-strong);
  transform: translateY(-2px);
}
.ai-track-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--ai-line);
}
.ai-track-head h3 {
  margin: 0;
  font-family: var(--ai-font-display);
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.ai-track-head a {
  color: var(--ai-accent);
  font-size: 0.78rem;
}
.ai-track-head span {
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.68rem;
}
.ai-track-weeks {
  display: grid;
  gap: 0.45rem;
}
.ai-week {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  align-items: center;
  padding: 0.55rem 0.65rem;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: background 160ms ease, border-color 160ms ease;
}
.ai-week:hover {
  background: rgba(167, 139, 250, 0.08);
  border-color: var(--ai-line);
}
.ai-week em {
  display: inline-grid;
  place-items: center;
  min-width: 2.2rem;
  height: 2.2rem;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--ai-accent-2);
  font-family: var(--ai-font-mono);
  font-size: 0.68rem;
  font-style: normal;
  font-weight: 600;
}
.ai-week strong {
  font-family: var(--ai-font-display);
  font-size: 0.88rem;
  font-weight: 600;
}
.ai-week small {
  display: block;
  color: var(--ai-muted);
  font-size: 0.72rem;
  font-weight: 400;
}
.ai-stat-row {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(6, 1fr);
  margin-top: 2rem;
}
.ai-stat {
  padding: 1rem 0.8rem;
  border: 1px solid var(--ai-line);
  border-radius: 16px;
  background: rgba(167, 139, 250, 0.04);
  text-align: center;
}
.ai-stat strong {
  display: block;
  font-family: var(--ai-font-display);
  font-size: clamp(1.3rem, 2.2vw, 1.8rem);
  letter-spacing: -0.03em;
}
.ai-stat span {
  color: var(--ai-muted);
  font-size: 0.75rem;
}
@media (max-width: 1020px) {
  .ai-stat-row { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 680px) {
  :root { --ai-max: calc(100vw - 1.4rem); }
  .ai-stat-row { grid-template-columns: repeat(2, 1fr); }
  .ai-track-board { grid-template-columns: 1fr; }
}

/* ——— Product site: brand + dropdown + research matrix ——— */
.ai-brand img.ai-brand-mark {
  width: auto;
  height: 34px;
  max-width: 168px;
  object-fit: contain;
}
.ai-brand .ai-brand-text {
  font-size: 1.22rem;
  letter-spacing: -0.05em;
}
.ai-brand .ai-brand-text .dot {
  color: var(--ai-accent);
  font-weight: 700;
}
.ai-brand em { display: none; }

.ai-nav-links {
  gap: 0.05rem;
}
.ai-drop {
  position: relative;
}
.ai-drop-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  padding: 0.48rem 0.72rem;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--ai-muted);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: 180ms ease;
}
a.ai-drop-toggle {
  color: var(--ai-muted);
}
.ai-drop-toggle::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.55;
}
.ai-drop-toggle:hover,
.ai-drop.open > .ai-drop-toggle,
.ai-drop:focus-within > .ai-drop-toggle {
  background: var(--ai-panel);
  color: var(--ai-text);
}
.ai-drop-panel {
  position: absolute;
  /* Overlap the toggle so the cursor never leaves .ai-drop while moving into the panel */
  top: calc(100% - 0.15rem);
  left: 50%;
  z-index: 120;
  display: none;
  min-width: 280px;
  padding: 0.55rem;
  border: 1px solid var(--ai-line-strong);
  border-radius: 16px;
  background: color-mix(in srgb, var(--ai-panel-strong) 94%, transparent);
  box-shadow: var(--ai-shadow);
  backdrop-filter: blur(18px);
  transform: translateX(-50%);
  pointer-events: auto;
}
/* Invisible hover bridge above the panel (covers any remaining gap under the nav item) */
.ai-drop-panel::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 100%;
  height: 0.75rem;
}
.ai-drop.wide > .ai-drop-panel { min-width: 420px; }
.ai-drop.open > .ai-drop-panel,
.ai-drop:hover > .ai-drop-panel,
.ai-drop:focus-within > .ai-drop-panel {
  display: grid;
  gap: 0.2rem;
}
@media (hover: hover) and (pointer: fine) and (min-width: 1021px) {
  .ai-drop:hover > .ai-drop-panel,
  .ai-drop:focus-within > .ai-drop-panel,
  .ai-drop.open > .ai-drop-panel {
    display: grid;
  }
}
.ai-drop-panel a {
  display: grid;
  gap: 0.12rem;
  padding: 0.72rem 0.8rem !important;
  border-radius: 12px;
  text-align: left;
}
.ai-drop-panel a strong {
  color: var(--ai-text);
  font-size: 0.88rem;
  font-weight: 700;
}
.ai-drop-panel a span {
  color: var(--ai-muted);
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.35;
}
.ai-drop-panel a:hover {
  background: rgba(167, 139, 250, 0.08);
}
.ai-nav-links > a.ai-nav-ext {
  color: var(--ai-muted);
  opacity: 0.85;
}
.ai-nav-links > a.ai-nav-ext::after {
  content: "↗";
  margin-left: 0.2rem;
  font-size: 0.7rem;
  opacity: 0.7;
}

.ai-research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.ai-research-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 220px;
  padding: 1.25rem 1.3rem 1.15rem;
  border: 1px solid var(--ai-line);
  border-radius: 18px;
  background:
    linear-gradient(165deg, rgba(167, 139, 250, 0.05), transparent 42%),
    var(--ai-panel);
  transition: 200ms ease;
}
.ai-research-card:hover {
  border-color: var(--ai-line-strong);
  transform: translateY(-3px);
  box-shadow: var(--ai-shadow);
}
.ai-research-card .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}
.ai-research-card .meta time,
.ai-research-card .meta .venue {
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.ai-research-card h3 {
  margin: 0;
  font-family: var(--ai-font-display);
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  line-height: 1.35;
}
.ai-research-card p {
  margin: 0;
  color: var(--ai-muted);
  font-size: 0.84rem;
  line-height: 1.55;
  flex: 1;
}
.ai-research-card .go {
  color: var(--ai-accent);
  font-size: 0.8rem;
  font-weight: 700;
}
.ai-feature-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}
.ai-feature-item {
  padding: 1.2rem 1.15rem;
  border: 1px solid var(--ai-line);
  border-radius: 16px;
  background: var(--ai-panel);
}
.ai-feature-item h3 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
}
.ai-feature-item p {
  margin: 0;
  color: var(--ai-muted);
  font-size: 0.82rem;
  line-height: 1.5;
}
.ai-academy-banner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding: 1.35rem 1.5rem;
  border: 1px dashed color-mix(in srgb, var(--ai-accent) 45%, var(--ai-line));
  border-radius: 18px;
  background: rgba(167, 139, 250, 0.04);
}
.ai-academy-banner p {
  margin: 0.25rem 0 0;
  color: var(--ai-muted);
  font-size: 0.88rem;
  max-width: 42rem;
}

@media (max-width: 1020px) {
  .ai-drop-panel {
    position: static;
    display: none;
    min-width: 0;
    transform: none;
    margin-top: 0.35rem;
  }
  .ai-drop.open > .ai-drop-panel { display: grid; }
  .ai-drop:hover > .ai-drop-panel { display: none; }
  .ai-drop.open:hover > .ai-drop-panel { display: grid; }
  .ai-nav-links.open {
    grid-template-columns: 1fr;
    max-height: min(70vh, 560px);
    overflow: auto;
  }
  .ai-research-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-feature-strip { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
  .ai-research-grid,
  .ai-feature-strip { grid-template-columns: 1fr; }
}

/* ——— Deep product v2: mega menu, showcase, research ——— */
.ai-brand {
  gap: 0;
}
.ai-brand img.ai-brand-mark {
  width: auto;
  height: 34px;
  max-width: 168px;
}
.ai-brand .ai-brand-text {
  display: inline-flex;
  align-items: baseline;
  margin-left: 0.2rem;
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: -0.055em;
}

.ai-drop.mega > .ai-drop-panel {
  min-width: min(640px, 86vw);
  padding: 0.85rem;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem 0.55rem;
}
.ai-drop-panel .ai-drop-label {
  grid-column: 1 / -1;
  margin: 0.35rem 0.55rem 0.15rem;
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ai-drop-panel .ai-drop-label:first-child { margin-top: 0.1rem; }

.ai-showcase {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
  padding: clamp(1.5rem, 3vw, 2.4rem) 0;
}
.ai-showcase.reverse { direction: rtl; }
.ai-showcase.reverse > * { direction: ltr; }
.ai-showcase-copy h3 {
  margin: 0.55rem 0 0.85rem;
  font-family: var(--ai-font-display);
  font-size: clamp(1.55rem, 2.8vw, 2.15rem);
  letter-spacing: -0.04em;
  line-height: 1.2;
}
.ai-showcase-copy p {
  margin: 0 0 0.85rem;
  color: var(--ai-muted);
  font-size: 0.98rem;
  line-height: 1.7;
  max-width: 38rem;
}
.ai-showcase-visual {
  position: relative;
  min-height: 240px;
  padding: 1.25rem;
  border: 1px solid var(--ai-line);
  border-radius: 22px;
  background:
    linear-gradient(145deg, rgba(167,139,250,0.07), transparent 45%),
    var(--ai-panel);
  overflow: hidden;
}
.ai-showcase-visual pre {
  margin: 0;
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  font-size: 0.72rem;
  line-height: 1.65;
  white-space: pre-wrap;
}
.ai-showcase-visual .tag {
  display: inline-block;
  margin-bottom: 0.85rem;
  padding: 0.28rem 0.55rem;
  border: 1px solid var(--ai-line-strong);
  border-radius: 999px;
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.65rem;
}

.ai-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 1.4rem;
}
.ai-filter-bar button {
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--ai-line);
  border-radius: 999px;
  background: transparent;
  color: var(--ai-muted);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  transition: 160ms ease;
}
.ai-filter-bar button.active,
.ai-filter-bar button:hover {
  border-color: var(--ai-line-strong);
  background: rgba(167, 139, 250, 0.1);
  color: var(--ai-text);
}

.ai-research-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
}
.ai-research-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 260px;
  padding: 0;
  overflow: hidden;
  border-radius: 20px;
}
.ai-research-card .cover {
  height: 88px;
  padding: 0.95rem 1.15rem;
  background:
    radial-gradient(circle at 85% 20%, rgba(56,189,248,0.35), transparent 45%),
    linear-gradient(135deg, rgba(167,139,250,0.18), rgba(6,11,16,0.2)),
    #0c1820;
  border-bottom: 1px solid var(--ai-line);
}
.ai-research-card .cover .id {
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
}
.ai-research-card .body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.65rem;
  padding: 1.05rem 1.15rem 1.15rem;
}
.ai-research-card .meta { margin: 0; }
.ai-research-card h3 { font-size: 1rem; }
.ai-paper-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 1.5rem;
  align-items: start;
}
.ai-paper-side {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 0.75rem;
  padding: 1.1rem;
  border: 1px solid var(--ai-line);
  border-radius: 16px;
  background: var(--ai-panel);
}
.ai-paper-side h3 {
  margin: 0;
  font-size: 0.78rem;
  color: var(--ai-muted);
  font-family: var(--ai-font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.ai-paper-side dl { margin: 0; display: grid; gap: 0.55rem; }
.ai-paper-side dt {
  color: var(--ai-muted);
  font-size: 0.72rem;
}
.ai-paper-side dd {
  margin: 0.1rem 0 0;
  font-size: 0.88rem;
  line-height: 1.45;
}
.ai-related {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.ai-related a {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--ai-line);
  border-radius: 999px;
  color: var(--ai-muted);
  font-size: 0.75rem;
}
.ai-related a:hover { color: var(--ai-accent); border-color: var(--ai-line-strong); }

.ai-tool-mosaic {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}
.ai-tool-chip {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 1.05rem;
  border: 1px solid var(--ai-line);
  border-radius: 16px;
  background: var(--ai-panel);
  transition: 180ms ease;
}
.ai-tool-chip:hover {
  border-color: var(--ai-line-strong);
  transform: translateY(-2px);
}
.ai-tool-chip strong {
  font-family: var(--ai-font-display);
  font-size: 1.02rem;
  letter-spacing: -0.03em;
}
.ai-tool-chip span {
  color: var(--ai-muted);
  font-size: 0.78rem;
  line-height: 1.45;
}
.ai-tool-chip em {
  color: var(--ai-accent);
  font-family: var(--ai-font-mono);
  font-size: 0.65rem;
  font-style: normal;
}

.ai-bridge {
  display: grid;
  gap: 0.85rem;
  padding: 1.6rem 1.7rem;
  border: 1px solid var(--ai-line);
  border-radius: 20px;
  background:
    linear-gradient(120deg, rgba(56,189,248,0.08), transparent 55%),
    var(--ai-panel);
}
.ai-bridge h2 { margin: 0; font-size: 1.35rem; }
.ai-bridge p { margin: 0; color: var(--ai-muted); max-width: 46rem; }

@media (max-width: 1020px) {
  .ai-showcase, .ai-showcase.reverse { grid-template-columns: 1fr; direction: ltr; }
  .ai-paper-layout { grid-template-columns: 1fr; }
  .ai-paper-side { position: static; }
  .ai-tool-mosaic { grid-template-columns: repeat(2, 1fr); }
  .ai-drop.mega > .ai-drop-panel { grid-template-columns: 1fr; min-width: 0; }
}
@media (max-width: 680px) {
  .ai-tool-mosaic { grid-template-columns: 1fr; }
  .ai-brand img.ai-brand-mark { height: 28px; }
}


/* P3: product hub density */
.ai-hero.ai-doc-hero-lite { padding-bottom: 2.5rem; }
.ai-paper-side .ai-button { display: inline-flex; width: 100%; justify-content: center; }
.ai-drop.mega > .ai-drop-panel a { min-height: 3.2rem; }
@media (max-width: 1020px) {
  .ai-nav-links.open .ai-drop { grid-column: 1 / -1; }
  .ai-nav-links.open .ai-drop-panel { margin-bottom: 0.4rem; }
}
@media (hover: hover) and (pointer: fine) and (min-width: 1021px) {
  .ai-drop:hover > .ai-drop-panel,
  .ai-drop.mega:hover > .ai-drop-panel {
    display: grid;
  }
}