/* ============================================================
   OBSIDIAN PORTAL — He Rui / 贺睿
   Design System: Precision Dark · Amber Command
   ============================================================ */

/* === 1. DESIGN TOKENS === */
:root {
  /* Backgrounds — tinted deep navy, not pure black */
  --bg:       oklch(9% 0.012 255);
  --bg-1:     oklch(12% 0.014 255);
  --bg-2:     oklch(16% 0.015 255);
  --bg-3:     oklch(21% 0.016 255);

  /* Accent — burnished amber (aviation instrument panels, not neon) */
  --amber:         oklch(72% 0.16 48);
  --amber-dim:     oklch(55% 0.12 48);
  --amber-muted:   oklch(72% 0.06 48 / 0.14);
  --amber-border:  oklch(72% 0.10 48 / 0.30);

  /* Semantic status */
  --green:   oklch(70% 0.18 150);
  --red:     oklch(60% 0.18 25);
  --blue:    oklch(65% 0.14 255);

  /* Text — cool tinted whites */
  --text-1:  oklch(96% 0.006 255);
  --text-2:  oklch(70% 0.012 255);
  --text-3:  oklch(48% 0.012 255);

  /* Borders */
  --border:       oklch(22% 0.018 255);
  --border-hover: oklch(35% 0.025 255);

  /* Typography */
  --font-display:  'Syne', system-ui, sans-serif;
  --font-body:     'Outfit', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Courier New', monospace;
  --font-zh:       'Noto Sans SC', 'PingFang SC', system-ui, sans-serif;

  /* 4pt spacing scale */
  --s1: 4px;   --s2: 8px;   --s3: 12px;  --s4: 16px;
  --s5: 24px;  --s6: 32px;  --s7: 48px;  --s8: 64px;
  --s9: 96px;  --s10: 128px;

  /* Easing */
  --ease-out-expo:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-in-out:    cubic-bezier(0.65, 0, 0.35, 1);

  /* Z-index stack */
  --z-bg:     -1;
  --z-base:    1;
  --z-sticky: 10;
  --z-nav:   100;
}

/* === 2. RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  /* Subtle dot grid — structural, not decorative */
  background-image: radial-gradient(circle, oklch(22% 0.018 255) 1px, transparent 1px);
  background-size: 32px 32px;
  background-attachment: fixed;
}

body.zh { font-family: var(--font-zh), var(--font-body); }

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
ul { list-style: none; }

/* Focus rings */
*:focus { outline: none; }
*:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 3px;
}

/* === 3. CANVAS BACKGROUND === */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  pointer-events: none;
  opacity: 0.6;
}

/* === 4. NAVIGATION === */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  padding: var(--s5) var(--s8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 300ms var(--ease-out-expo), border-color 300ms var(--ease-out-expo);
}

.nav.scrolled {
  background: oklch(9% 0.012 255 / 0.88);
  backdrop-filter: blur(24px) saturate(1.2);
  -webkit-backdrop-filter: blur(24px) saturate(1.2);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--amber);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--s7);
}

.nav-link {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  transition: color 120ms;
  position: relative;
  padding-bottom: 2px;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--amber);
  transition: width 300ms var(--ease-out-expo);
}

.nav-link:hover,
.nav-link.active { color: var(--text-1); }

.nav-link:hover::after,
.nav-link.active::after { width: 100%; }

/* Language Toggle — only glassmorphism element on page */
.lang-toggle {
  display: flex;
  align-items: center;
  background: oklch(12% 0.014 255 / 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 3px;
  gap: 0;
}

.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 5px 14px;
  border-radius: 100px;
  color: var(--text-3);
  transition: color 120ms, background 250ms var(--ease-out-expo);
  user-select: none;
}

.lang-btn.active {
  background: var(--amber);
  color: oklch(9% 0.012 255);
  font-weight: 600;
}

/* Section nav dots */
.section-nav {
  position: fixed;
  right: var(--s7);
  top: 50%;
  transform: translateY(-50%);
  z-index: var(--z-nav);
  display: flex;
  flex-direction: column;
  gap: var(--s3);
  align-items: center;
}

.section-dot {
  width: 5px;
  height: 5px;
  border-radius: 100px;
  background: var(--border);
  cursor: pointer;
  transition: background 250ms, height 300ms var(--ease-out-expo), transform 120ms;
}

.section-dot:hover { transform: scale(1.4); }

.section-dot.active {
  background: var(--amber);
  height: 22px;
}

/* === 5. MAIN LAYOUT === */
main { position: relative; z-index: var(--z-base); }

.section {
  padding: var(--s10) var(--s8);
  max-width: 1280px;
  margin: 0 auto;
  position: relative;
}

.section-header {
  margin-bottom: clamp(var(--s8), 8vw, var(--s10));
  position: relative;
  padding-top: var(--s6);
}

/* Oversized number creates depth without decoration */
.section-num {
  font-family: var(--font-mono);
  font-size: clamp(5.5rem, 14vw, 10rem);
  font-weight: 400;
  color: var(--amber-muted);
  line-height: 1;
  position: absolute;
  top: -0.15em;
  left: -0.08em;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.03em;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.05;
  position: relative;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-2);
  margin-top: var(--s4);
  max-width: 58ch;
  line-height: 1.75;
}

/* Divider line between sections */
.section + .section::before {
  content: '';
  display: block;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  height: 1px;
  background: var(--border);
}

/* === 6. HERO === */
#hero {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 0 var(--s8);
  position: relative;
}

.hero-inner {
  max-width: 1280px;
  width: 100%;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: var(--s5);
}

.hero-eyebrow-line {
  width: 28px;
  height: 1px;
  background: var(--amber);
  flex-shrink: 0;
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(3.75rem, 10vw, 8rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 0.92;
  margin-bottom: var(--s6);
}

.hero-name .part-zh { color: var(--text-1); }
.hero-name .part-sep { color: oklch(35% 0.018 255); font-weight: 300; margin: 0 0.12em; }
.hero-name .part-en { color: var(--text-2); }

.hero-roles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s3);
  margin-bottom: var(--s7);
}

.role-chip {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--s2) var(--s4);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-3);
}

.role-chip.amber {
  border-color: var(--amber-border);
  color: var(--amber);
}

.hero-desc {
  font-size: clamp(1rem, 1.8vw, 1.1875rem);
  color: var(--text-2);
  max-width: 58ch;
  line-height: 1.8;
  margin-bottom: var(--s8);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: var(--s5);
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--s3);
  background: var(--amber);
  color: oklch(9% 0.012 255);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: var(--s4) var(--s6);
  border-radius: 8px;
  transition: opacity 120ms, transform 120ms;
}

.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  font-size: 0.9375rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: color 120ms, border-color 120ms;
}

.btn-ghost:hover { color: var(--text-1); border-color: var(--text-2); }

.hero-scroll {
  position: absolute;
  bottom: var(--s7);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s2);
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-3);
}

.hero-scroll-line {
  width: 1px;
  height: 44px;
  background: linear-gradient(to bottom, var(--amber), transparent);
  animation: scrollFade 2s var(--ease-in-out) infinite;
}

@keyframes scrollFade {
  0%   { opacity: 1; transform: scaleY(1) translateY(0); }
  100% { opacity: 0; transform: scaleY(0.4) translateY(10px); }
}

/* Typewriter cursor */
.typewriter-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--amber);
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1.1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* === 7. JOURNEY TIMELINE === */
#journey { overflow: hidden; }

.timeline {
  position: relative;
  padding-left: 64px;
  max-width: 860px;
}

.timeline-spine {
  position: absolute;
  left: 19px;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-progress-bar {
  position: absolute;
  left: 19px;
  top: 0;
  width: 1px;
  height: 0;
  background: var(--amber);
  transition: height 0.08s linear;
}

.tl-item {
  position: relative;
  padding-bottom: var(--s10);
}

.tl-item:last-child { padding-bottom: 0; }

.tl-node {
  position: absolute;
  left: -53px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  transition: border-color 400ms, background 400ms, box-shadow 400ms;
}

.tl-item.in-view .tl-node {
  border-color: var(--amber);
  background: var(--amber-muted);
}

.tl-item.current .tl-node {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-muted);
}

.tl-date {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--amber-dim);
  letter-spacing: 0.1em;
  margin-bottom: var(--s2);
}

.tl-org {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: var(--s1);
  line-height: 1.15;
}

.tl-role {
  font-size: 0.9375rem;
  color: var(--text-2);
  font-weight: 500;
  margin-bottom: var(--s4);
}

.tl-body {
  font-size: 0.9375rem;
  color: var(--text-3);
  max-width: 62ch;
  line-height: 1.75;
  margin-bottom: var(--s4);
}

.tl-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
}

.metric {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--amber);
  padding: 3px 10px;
  border: 1px solid var(--amber-border);
  background: var(--amber-muted);
  border-radius: 4px;
}

/* Timeline fade in */
.tl-item {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 600ms var(--ease-out-expo), transform 600ms var(--ease-out-expo);
}

.tl-item.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* === 8. PROJECTS === */
.projects-stack { display: flex; flex-direction: column; gap: var(--s5); }

/* Featured project — editorial asymmetric layout */
.project-featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 300ms;
  container-type: inline-size;
}

.project-featured:hover { border-color: var(--border-hover); }

.project-body {
  padding: var(--s8);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.project-canvas {
  background: var(--bg-1);
  position: relative;
  overflow: hidden;
  min-height: 360px;
  display: grid;
  place-items: center;
}

.project-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: var(--s4);
}

.project-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: var(--s4);
}

.project-desc {
  font-size: 0.9375rem;
  color: var(--text-2);
  line-height: 1.75;
  margin-bottom: var(--s5);
  flex: 1;
}

.tech-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  margin-bottom: var(--s5);
}

.tech-chip {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 3px 8px;
  background: var(--bg-2);
  border-radius: 3px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--amber);
  transition: gap 200ms var(--ease-out-expo);
}

.project-link:hover { gap: var(--s3); }

/* Physics scale SVG animation */
.physics-scale { width: 100%; max-width: 300px; }

.scale-beam {
  transform-origin: center;
  animation: scaleTilt 3s var(--ease-in-out) infinite;
}

@keyframes scaleTilt {
  0%, 100% { transform: rotate(-8deg); }
  50% { transform: rotate(8deg); }
}

.scale-pan-l { animation: panL 3s var(--ease-in-out) infinite; }
.scale-pan-r { animation: panR 3s var(--ease-in-out) infinite; }

@keyframes panL {
  0%, 100% { transform: translateY(-10px); }
  50% { transform: translateY(10px); }
}
@keyframes panR {
  0%, 100% { transform: translateY(10px); }
  50% { transform: translateY(-10px); }
}

/* Secondary project cards */
.projects-secondary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s5);
}

.project-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--s7);
  transition: border-color 300ms, transform 300ms var(--ease-out-expo);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.project-card .project-desc { flex: 1; }

/* === 9. LLM INTELLIGENCE HUB === */
.llm-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--s8);
  align-items: start;
}

/* Tabs */
.llm-tabs {
  display: flex;
  gap: var(--s2);
  margin-bottom: var(--s5);
  border-bottom: 1px solid var(--border);
}

.llm-tab {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--s3) var(--s4);
  color: var(--text-3);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 120ms, border-color 120ms;
}

.llm-tab.active { color: var(--amber); border-bottom-color: var(--amber); }

/* Table */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.bench-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.bench-table thead th {
  padding: var(--s4) var(--s5);
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
  background: var(--bg-1);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition: color 120ms;
}

.bench-table thead th:hover { color: var(--amber); }
.bench-table thead th.sorted { color: var(--amber); }
.bench-table thead th .sort-arrow { margin-left: 4px; opacity: 0.35; }
.bench-table thead th.sorted .sort-arrow { opacity: 1; }

.bench-table tbody tr {
  border-bottom: 1px solid oklch(14% 0.014 255);
  transition: background 120ms;
}

.bench-table tbody tr:last-child { border-bottom: none; }
.bench-table tbody tr:hover { background: var(--bg-1); }

.bench-table tbody td {
  padding: var(--s4) var(--s5);
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.bench-table tbody td:first-child { color: var(--text-1); font-weight: 500; }
.bench-table tbody td:nth-child(2) { color: var(--text-3); font-family: var(--font-mono); font-size: 0.75rem; }

.elo-val {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--amber);
}

.score-cell {
  display: flex;
  align-items: center;
  gap: var(--s3);
  min-width: 110px;
}

.score-track {
  flex: 1;
  height: 2px;
  background: var(--bg-3);
  border-radius: 2px;
  overflow: hidden;
  max-width: 70px;
}

.score-fill {
  height: 100%;
  background: var(--amber-dim);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 900ms var(--ease-out-expo);
}

.score-fill.animate { transform: scaleX(var(--pct, 1)); }

/* Radar chart panel */
.radar-panel {
  position: sticky;
  top: var(--s9);
}

.radar-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: var(--s4);
}

#radar-canvas { width: 100%; aspect-ratio: 1; max-width: 380px; }

.radar-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s3);
  margin-top: var(--s4);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--s2);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.05em;
  color: var(--text-3);
  cursor: pointer;
  transition: color 120ms;
  user-select: none;
}

.legend-item.active { color: var(--text-2); }
.legend-item.inactive { opacity: 0.4; }

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.llm-footnote {
  margin-top: var(--s6);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--text-3);
  line-height: 1.7;
  padding: var(--s4) var(--s5);
  border-left: 2px solid var(--border);
  max-width: 70ch;
}

/* === 10. AI CURATED FEED === */
.feed-block + .feed-block { margin-top: var(--s9); }

.feed-heading {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-dim);
  margin-bottom: var(--s5);
  display: flex;
  align-items: center;
  gap: var(--s3);
}

.feed-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.thinkers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--s4);
}

.thinker-card {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--s4);
  padding: var(--s5);
  border: 1px solid var(--border);
  border-radius: 10px;
  align-items: start;
  transition: border-color 250ms, transform 250ms var(--ease-out-expo);
}

.thinker-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.thinker-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-2);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--amber);
  flex-shrink: 0;
  overflow: hidden;
}

.thinker-avatar img { width: 100%; height: 100%; object-fit: cover; }

.thinker-name { font-weight: 600; font-size: 0.9375rem; margin-bottom: 2px; }

.thinker-org {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--amber-dim);
  letter-spacing: 0.06em;
  margin-bottom: var(--s2);
}

.thinker-desc { font-size: 0.8125rem; color: var(--text-3); line-height: 1.6; }

/* Podcasts */
.podcast-list { display: flex; flex-direction: column; gap: var(--s3); }

.podcast-row {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  align-items: center;
  gap: var(--s4);
  padding: var(--s4) var(--s5);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 250ms;
  container-type: inline-size;
}

.podcast-row:hover { border-color: var(--border-hover); }

.podcast-art {
  width: 56px;
  height: 56px;
  border-radius: 8px;
  background: var(--bg-2);
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.podcast-name { font-weight: 600; font-size: 0.9375rem; margin-bottom: 1px; }
.podcast-host { font-size: 0.8125rem; color: var(--text-3); }

.podcast-badge {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  border: 1px solid var(--amber-border);
  background: var(--amber-muted);
  padding: 3px 8px;
  border-radius: 3px;
  white-space: nowrap;
}

/* === 11. GITHUB PULSE === */
.pulse-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--s5);
  flex-wrap: wrap;
  gap: var(--s4);
}

.live-indicator {
  display: flex;
  align-items: center;
  gap: var(--s2);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
}

.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  animation: livePulse 2s ease-in-out infinite;
}

@keyframes livePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.pulse-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--s6);
}

.pulse-tab {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--s3) var(--s5);
  color: var(--text-3);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 120ms, border-color 120ms;
}

.pulse-tab.active { color: var(--amber); border-bottom-color: var(--amber); }

.repos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--s4);
  min-height: 280px;
}

.repo-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--s5) var(--s6);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 400ms var(--ease-out-expo), transform 400ms var(--ease-out-expo), border-color 250ms;
}

.repo-card.show {
  opacity: 1;
  transform: translateY(0);
}

.repo-card:hover { border-color: var(--border-hover); }

.repo-name {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--s3);
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.repo-owner { color: var(--text-3); }
.repo-owner::after { content: '/'; margin: 0 1px; }
.repo-repo { color: var(--text-1); }

.repo-desc {
  font-size: 0.8125rem;
  color: var(--text-3);
  line-height: 1.65;
  margin-bottom: var(--s4);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.repo-meta {
  display: flex;
  align-items: center;
  gap: var(--s4);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
}

.repo-stars { display: flex; align-items: center; gap: 4px; }
.repo-stars::before { content: '★'; color: var(--amber-dim); }

.repo-lang { display: flex; align-items: center; gap: 6px; }

.lang-pip {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Skeleton */
.skeleton-card { border: 1px solid var(--border); border-radius: 10px; padding: var(--s5) var(--s6); }
.skel { background: linear-gradient(90deg, var(--bg-1) 25%, var(--bg-2) 50%, var(--bg-1) 75%); background-size: 200%; border-radius: 4px; animation: shimmer 1.4s infinite; margin-bottom: var(--s3); }
.skel.h12 { height: 12px; }
.skel.h14 { height: 14px; }
.skel.w30 { width: 30%; }
.skel.w55 { width: 55%; }
.skel.w80 { width: 80%; }
.skel.w95 { width: 95%; }

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* === 12. FOOTER === */
footer {
  border-top: 1px solid var(--border);
  padding: var(--s7) var(--s8);
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--s4);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-3);
}

.footer-links { display: flex; gap: var(--s5); }

.footer-link {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-3);
  transition: color 120ms;
}

.footer-link:hover { color: var(--amber); }

/* === 13. ENTRANCE ANIMATIONS === */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 700ms var(--ease-out-expo), transform 700ms var(--ease-out-expo);
}

.delay-1 { transition-delay: 80ms; }
.delay-2 { transition-delay: 160ms; }
.delay-3 { transition-delay: 240ms; }
.delay-4 { transition-delay: 320ms; }

/* Hero entrance */
.hero-eyebrow { opacity: 0; transform: translateY(16px); }
.hero-name    { opacity: 0; transform: translateY(20px); }
.hero-roles   { opacity: 0; transform: translateY(16px); }
.hero-desc    { opacity: 0; transform: translateY(12px); }
.hero-cta     { opacity: 0; transform: translateY(12px); }

.hero-loaded .hero-eyebrow { opacity: 1; transform: none; transition: opacity 700ms 100ms var(--ease-out-expo), transform 700ms 100ms var(--ease-out-expo); }
.hero-loaded .hero-name    { opacity: 1; transform: none; transition: opacity 900ms 200ms var(--ease-out-expo), transform 900ms 200ms var(--ease-out-expo); }
.hero-loaded .hero-roles   { opacity: 1; transform: none; transition: opacity 700ms 400ms var(--ease-out-expo), transform 700ms 400ms var(--ease-out-expo); }
.hero-loaded .hero-desc    { opacity: 1; transform: none; transition: opacity 700ms 550ms var(--ease-out-expo), transform 700ms 550ms var(--ease-out-expo); }
.hero-loaded .hero-cta     { opacity: 1; transform: none; transition: opacity 700ms 700ms var(--ease-out-expo), transform 700ms 700ms var(--ease-out-expo); }

/* === 14. RESPONSIVE === */
@media (max-width: 1100px) {
  .llm-grid { grid-template-columns: 1fr; }
  .radar-panel { position: static; }
  #radar-canvas { max-width: 340px; }
}

@media (max-width: 900px) {
  .project-featured { grid-template-columns: 1fr; }
  .project-canvas { min-height: 220px; }
}

@media (max-width: 768px) {
  .section { padding: var(--s9) var(--s5); }
  .nav { padding: var(--s4) var(--s5); }
  .nav-links { display: none; }
  .section-nav { display: none; }
  .projects-secondary { grid-template-columns: 1fr; }
  .thinkers-grid { grid-template-columns: 1fr 1fr; }
  .repos-grid { grid-template-columns: 1fr; }
  footer { flex-direction: column; text-align: center; }
  .hero-name { font-size: clamp(2.75rem, 11vw, 4.5rem); }
  .timeline { padding-left: 48px; }
}

@media (max-width: 520px) {
  .thinkers-grid { grid-template-columns: 1fr; }
  .podcast-row { grid-template-columns: 46px 1fr; }
  .podcast-badge { display: none; }
  .hero-roles { display: none; }
}

/* Touch / hover detection */
@media (hover: none) {
  .project-featured:hover,
  .project-card:hover,
  .thinker-card:hover { transform: none; }
}

/* === 15. REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .fade-up,
  .tl-item,
  .hero-eyebrow,
  .hero-name,
  .hero-roles,
  .hero-desc,
  .hero-cta {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* === UTILITIES === */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.mono { font-family: var(--font-mono); }
.accent { color: var(--amber); }
.muted { color: var(--text-3); }

/* ================================================================
   VISUAL UPGRADES — v2
   ================================================================ */

/* --- Scroll progress bar --- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0%;
  background: var(--amber);
  z-index: calc(var(--z-nav) + 10);
  transition: width 0.08s linear;
  box-shadow: 0 0 8px var(--amber-border);
}

/* --- Hero two-column layout --- */
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--s9);
  align-items: center;
  max-width: 1280px;
  width: 100%;
}

.hero-text { display: flex; flex-direction: column; }

/* Hero stat strip */
.hero-stats {
  display: flex;
  align-items: center;
  gap: var(--s5);
  margin-top: var(--s7);
  padding-top: var(--s6);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.stat-val {
  font-size: 1.625rem;
  font-weight: 500;
  line-height: 1;
  color: var(--text-1);
  font-variant-numeric: tabular-nums;
}

.stat-unit {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 400;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
}

.stat-divider {
  width: 1px;
  height: 32px;
  background: var(--border);
  flex-shrink: 0;
}

/* --- Photo frame with tech treatment --- */
.hero-photo-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--s3);
  opacity: 0;
  transform: translateX(20px);
}

.hero-loaded .hero-photo-side {
  opacity: 1;
  transform: translateX(0);
  transition: opacity 900ms 500ms var(--ease-out-expo),
              transform 900ms 500ms var(--ease-out-expo);
}

.hero-photo-frame {
  position: relative;
  width: 100%;
  max-width: 300px;
}

.hero-photo-frame img {
  width: 100%;
  display: block;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top center;
  filter: saturate(0.88) contrast(1.06);
}

/* Four corner brackets */
.photo-corner {
  position: absolute;
  width: 18px;
  height: 18px;
  border-style: solid;
  border-color: var(--amber);
}
.photo-corner.tl { top: -4px; left: -4px;   border-width: 2px 0 0 2px; }
.photo-corner.tr { top: -4px; right: -4px;  border-width: 2px 2px 0 0; }
.photo-corner.bl { bottom: -4px; left: -4px;  border-width: 0 0 2px 2px; }
.photo-corner.br { bottom: -4px; right: -4px; border-width: 0 2px 2px 0; }

/* Scan line sweeping down the photo */
.photo-scan {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(to right, transparent 0%, var(--amber) 40%, var(--amber) 60%, transparent 100%);
  opacity: 0;
  animation: photoScan 5s ease-in-out 2s infinite;
}

@keyframes photoScan {
  0%   { top: 0%;   opacity: 0; }
  5%   { opacity: 0.55; }
  95%  { opacity: 0.55; }
  100% { top: 100%; opacity: 0; }
}

/* Centre crosshair dot */
.photo-crosshair {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  pointer-events: none;
}

.photo-crosshair::before,
.photo-crosshair::after {
  content: '';
  position: absolute;
  background: oklch(72% 0.16 48 / 0.35);
}

.photo-crosshair::before { top: 50%; left: 0; right: 0; height: 1px; transform: translateY(-50%); }
.photo-crosshair::after  { left: 50%; top: 0; bottom: 0; width: 1px; transform: translateX(-50%); }

/* Photo meta label */
.photo-meta {
  display: flex;
  gap: var(--s4);
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  color: var(--text-3);
}

/* --- Glitch animation on hero name --- */
@keyframes glitch {
  0%,  89%, 100% { clip-path: none; transform: none; }
  90%  { clip-path: inset(30% 0 40% 0); transform: translateX(-3px); }
  91%  { clip-path: inset(60% 0 10% 0); transform: translateX(3px); }
  92%  { clip-path: none; transform: none; }
  93%  { clip-path: inset(10% 0 70% 0); transform: translateX(-2px); }
  94%  { clip-path: none; transform: none; }
}

.hero-name { animation: glitch 9s steps(1) infinite; }

/* --- Section header extending amber line --- */
.section-title::after {
  content: '';
  display: block;
  width: 0;
  height: 2px;
  background: var(--amber);
  margin-top: var(--s3);
  border-radius: 1px;
  transition: width 1100ms var(--ease-out-expo);
}

.section-title.line-reveal::after { width: 56px; }

/* --- Timeline node pulse for current item --- */
.tl-item.current .tl-node::after {
  content: '';
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 1px solid var(--amber);
  animation: nodePulse 2.4s ease-out infinite;
}

@keyframes nodePulse {
  0%   { transform: scale(1);   opacity: 0.6; }
  100% { transform: scale(2.5); opacity: 0; }
}

/* Make the timeline node relative for the pulse */
.tl-node { position: relative; }

/* --- Tech grid accent lines on LLM section --- */
#llm-hub .section-header::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  width: 100vw;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border) 15%, var(--border) 85%, transparent);
  pointer-events: none;
}

/* --- Ambient glow on section numbers --- */
.section-num {
  text-shadow: 0 0 80px oklch(72% 0.16 48 / 0.08);
}

/* --- GitHub card hover accent line --- */
.repo-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 0;
  background: var(--amber);
  border-radius: 10px 10px 0 0;
  transition: height 250ms var(--ease-out-expo);
}

.repo-card { position: relative; overflow: hidden; }
.repo-card:hover::before { height: 2px; }

/* --- Thinker card hover amber edge --- */
.thinker-card { overflow: hidden; }
.thinker-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 0; height: 100%;
  background: var(--amber);
  border-radius: 0;
  transition: width 250ms var(--ease-out-expo);
}
.thinker-card:hover::before { width: 2px; }
.thinker-card { position: relative; }

/* --- Hero desc accent line --- */
.hero-desc-accent {
  display: inline-block;
  margin-top: var(--s3);
  color: var(--amber);
  font-weight: 500;
}

/* --- Nav logo subtle hover --- */
.nav-logo {
  letter-spacing: 0.14em;
  transition: letter-spacing 300ms var(--ease-out-expo);
}
.nav-logo:hover { letter-spacing: 0.22em; }

/* --- Hero description reduced entrance animation --- */
.hero-loaded .hero-stats {
  opacity: 1;
  transform: none;
  transition: opacity 700ms 850ms var(--ease-out-expo), transform 700ms 850ms var(--ease-out-expo);
}
.hero-stats {
  opacity: 0;
  transform: translateY(10px);
  /* glass override: remove the old solid border-top, glass has its own border */
  border-top: none;
  margin-top: var(--s7);
}

/* --- Responsive hero photo --- */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--s7);
  }
  .hero-photo-side {
    order: -1;
    align-items: flex-start;
  }
  .hero-photo-frame { max-width: 180px; }
}

@media (max-width: 520px) {
  .hero-stats { gap: var(--s4); }
  .stat-divider { display: none; }
}

/* ================================================================
   ADVANCED VISUAL LAYER v3
   ================================================================ */

/* --- Mesh Gradient Glows (breathing depth) --- */
/* Amber glow — bottom-left, behind figure */
body::before {
  content: '';
  position: fixed;
  bottom: -20%;
  left: -15%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(ellipse at center,
    oklch(28% 0.07 42 / 0.22) 0%,
    oklch(20% 0.04 42 / 0.10) 40%,
    transparent 70%);
  pointer-events: none;
  z-index: 0;
  animation: glowPulse 8s ease-in-out infinite;
}

/* Blue glow — top-right */
body::after {
  content: '';
  position: fixed;
  top: -20%;
  right: -15%;
  width: 55vw;
  height: 55vw;
  background: radial-gradient(ellipse at center,
    oklch(22% 0.06 255 / 0.18) 0%,
    oklch(15% 0.03 255 / 0.08) 45%,
    transparent 70%);
  pointer-events: none;
  z-index: 0;
  animation: glowPulse 10s ease-in-out 3s infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(1.08); }
}

/* Ensure main content is above glows */
.nav, main, footer { position: relative; z-index: 1; }

/* --- Glassmorphism Stats Strip --- */
.hero-stats {
  backdrop-filter: blur(16px) saturate(1.3);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  background: oklch(12% 0.014 255 / 0.4);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--s5) var(--s6);
}

/* --- Photo Metadata Scan Tags --- */
.photo-tag {
  position: absolute;
  right: 10px;
  opacity: 0;
  transform: translateX(10px);
  pointer-events: none;
  z-index: 4;

  display: flex;
  align-items: center;
  gap: 10px;

  background: oklch(9% 0.012 255 / 0.90);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--amber-border);
  border-left: 2px solid var(--amber);
  padding: 5px 10px 5px 12px;

  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;

  transition: opacity 220ms var(--ease-out-expo),
              transform 220ms var(--ease-out-expo);
}

/* Connector dot — glowing amber */
.photo-tag::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  background: var(--amber);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--amber), 0 0 16px oklch(72% 0.16 48 / 0.4);
}

.photo-tag.show {
  opacity: 1;
  transform: translateX(0);
}

.tag-name  { color: var(--text-3); flex-shrink: 0; }
.tag-score {
  color: var(--amber);
  font-size: 0.8125rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  min-width: 22px;
  text-align: right;
}

/* --- Click Ripple Canvas --- */
/* (handled entirely in JS canvas, no extra CSS needed) */