/* =========================================================
   Ahmed Yahia Kallel — “Signal Journal” design system
   Editorial print × signal-lab instrumentation.
   Warm paper & ink · phosphor accent · oversized serif
   display · mono annotations · slow drifting motion ·
   frequency-ruler dividers · page transitions.
   ========================================================= */

:root {
  /* Type */
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Source Serif 4", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Paper & ink (light) — warm lab-notebook cream */
  --paper: #f7f3ea;
  --paper-soft: #efe9db;
  --paper-card: #fbf8f1;
  --paper-glass: rgba(247, 243, 234, 0.82);
  --ink: #191512;
  --ink-1: #3d3831;
  --ink-2: #7a7263;
  --rule: rgba(25, 21, 18, 0.14);
  --rule-soft: rgba(25, 21, 18, 0.06);

  /* Accents — phosphor green + signal amber */
  --accent: #0c7a5a;
  --accent-ink: #0a5c45;
  --accent-2: #b06810;
  --accent-2-soft: rgba(176, 104, 16, 0.1);
  --accent-glow: rgba(12, 122, 90, 0.28);

  /* Canvas hook colors */
  --sky: #0c7a5a;
  --blue: #b06810;
  --indigo: #4c4370;
  --grid-c: rgba(25, 21, 18, 0.06);

  --grad-brand: linear-gradient(120deg, var(--accent), var(--accent-2));
  --glow: 0 0 26px var(--accent-glow);

  --shadow-card: 0 1px 0 rgba(25, 21, 18, 0.05);
  --shadow-lift: 10px 10px 0 rgba(25, 21, 18, 0.08);
  --shadow-pop: 7px 7px 0 var(--accent);

  --nav-bg: rgba(247, 243, 234, 0.86);

  --radius-s: 2px;
  --radius: 4px;
  --radius-l: 6px;
  --maxw: 1180px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0, 1);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);

  --t-surface: background-color 0.4s var(--ease), color 0.4s var(--ease), border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

[data-theme="dark"] {
  /* Phosphor oscilloscope (dark) */
  --paper: #0d0f0d;
  --paper-soft: #131714;
  --paper-card: #141815;
  --paper-glass: rgba(13, 15, 13, 0.85);
  --ink: #f2efe6;
  --ink-1: #cfc9ba;
  --ink-2: #8b857a;
  --rule: rgba(242, 239, 230, 0.14);
  --rule-soft: rgba(242, 239, 230, 0.05);

  --accent: #3ce6a4;
  --accent-ink: #7ff3c6;
  --accent-2: #f0b254;
  --accent-2-soft: rgba(240, 178, 84, 0.1);
  --accent-glow: rgba(60, 230, 164, 0.22);

  --sky: #3ce6a4;
  --blue: #f0b254;
  --indigo: #8f83c9;
  --grid-c: rgba(60, 230, 164, 0.07);

  --glow: 0 0 32px var(--accent-glow);
  --shadow-card: 0 1px 0 rgba(0, 0, 0, 0.4);
  --shadow-lift: 10px 10px 0 rgba(0, 0, 0, 0.45);
  --shadow-pop: 7px 7px 0 var(--accent);
  --nav-bg: rgba(13, 15, 13, 0.86);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink-1);
  font-size: 1.05rem;
  line-height: 1.74;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: var(--t-surface);
  font-feature-settings: "kern", "liga", "onum";
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.06;
  font-weight: 600;
  letter-spacing: -0.022em;
  transition: color 0.55s var(--ease);
}
em, i { font-style: italic; }
a { color: var(--accent-ink); text-decoration: none; transition: color 0.3s var(--ease); }
a:hover { color: var(--accent-2); }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }

/* Faint ruled-notebook background */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-color: var(--paper);
  background-image: linear-gradient(var(--rule-soft) 1px, transparent 1px);
  background-size: 100% 56px;
  transition: background-color 0.6s var(--ease);
}
/* Paper grain */
body::after {
  content: "";
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: 0.035; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='f'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23f)'/%3E%3C/svg%3E");
}
[data-theme="dark"] body::after { mix-blend-mode: overlay; opacity: 0.06; }

/* ───────── Page transitions (MPA) ─────────
   The @view-transition rule is injected by main.js only when the
   site is served over http(s) — file:// previews use a JS fade. */
::view-transition-old(root) { animation: vt-out 0.28s var(--ease) both; }
::view-transition-new(root) { animation: vt-in 0.42s var(--ease-out) both; }
@keyframes vt-out { to { opacity: 0; transform: translateY(-14px); } }
@keyframes vt-in { from { opacity: 0; transform: translateY(18px); } }
body.page-exit { opacity: 0; transform: translateY(-12px); transition: opacity 0.24s var(--ease), transform 0.24s var(--ease); }
body { animation: page-in 0.55s var(--ease-out); }
@keyframes page-in { from { opacity: 0; transform: translateY(14px); } }

/* ───────── Slow floating drift ───────── */
@keyframes drift {
  0%   { transform: translate(0, 0) rotate(0deg); }
  50%  { transform: translate(6px, -12px) rotate(1.2deg); }
  100% { transform: translate(-4px, 6px) rotate(-0.8deg); }
}
@keyframes drift2 {
  0%   { transform: translate(0, 0) rotate(0deg); }
  50%  { transform: translate(-10px, 10px) rotate(-1.6deg); }
  100% { transform: translate(8px, -6px) rotate(1deg); }
}
.float-slow { animation: drift 11s ease-in-out infinite alternate; }
.float-slower { animation: drift2 16s ease-in-out infinite alternate; }

/* Decorative drifting annotations (injected by main.js) */
.deco {
  position: absolute; z-index: 0; pointer-events: none;
  color: var(--ink-2); opacity: 0.5;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em;
}
.deco svg { display: block; stroke: currentColor; fill: none; opacity: 0.65; }
.deco.accent { color: var(--accent); }
.deco.amber { color: var(--accent-2); }

/* Scroll progress hairline */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0; z-index: 200;
  background: var(--grad-brand);
  box-shadow: 0 0 12px var(--accent-glow);
  transition: width 0.12s linear;
}

/* ───────── Navigation ───────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--rule);
  transition: transform 0.5s var(--ease), background 0.55s var(--ease), border-color 0.55s var(--ease);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 4.4rem; }
.logo {
  display: inline-flex; align-items: center; gap: 0.65rem;
  font-family: var(--font-display); font-weight: 600; font-size: 1.12rem;
  color: var(--ink); letter-spacing: -0.02em;
}
.logo .mark {
  display: grid; place-items: center; width: 2.2rem; height: 2.2rem; border-radius: 3px;
  background: var(--ink); color: var(--paper); font-family: var(--font-mono);
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.02em;
  border: 1px solid var(--ink);
  transition: transform 0.5s var(--ease-spring), background 0.4s, color 0.4s;
}
.logo:hover .mark { transform: rotate(-8deg) scale(1.06); background: var(--accent); color: #fff; }
[data-theme="dark"] .logo:hover .mark { color: #0d0f0d; }
.nav-links { display: flex; align-items: center; gap: 0.1rem; }
.nav-links a {
  position: relative; color: var(--ink-1);
  font-family: var(--font-mono); font-weight: 500; font-size: 0.82rem;
  letter-spacing: 0.02em; text-transform: uppercase;
  padding: 0.5rem 0.8rem; border-radius: 3px;
  transition: color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav-links a:hover { color: var(--ink); background: var(--rule-soft); }
.nav-links a.active { color: var(--accent-ink); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0.8rem; right: 0.8rem; bottom: 0.22rem;
  height: 2px; background: var(--accent);
}
.nav-actions { display: flex; align-items: center; gap: 0.5rem; }
.icon-btn {
  display: grid; place-items: center; width: 2.5rem; height: 2.5rem; border-radius: 3px;
  background: transparent; border: 1px solid var(--rule); color: var(--ink-1);
  cursor: pointer;
  transition: transform 0.45s var(--ease-spring), color 0.3s, border-color 0.3s, background 0.4s;
}
.icon-btn:hover { color: var(--accent-ink); border-color: var(--accent); transform: translateY(-2px); }
.icon-btn:active { transform: scale(0.92); }
.nav-toggle { display: none; }

@media (max-width: 960px) {
  .nav-links {
    position: fixed; top: 4.4rem; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0.1rem;
    background: var(--paper-glass);
    -webkit-backdrop-filter: blur(24px) saturate(160%); backdrop-filter: blur(24px) saturate(160%);
    border-bottom: 1px solid var(--rule);
    padding: 0.8rem 1.25rem 1.3rem;
    transform: translateY(-130%); opacity: 0; visibility: hidden;
    transition: transform 0.5s var(--ease-spring), opacity 0.35s var(--ease), visibility 0.3s;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav-links a { padding: 0.85rem 0.8rem; font-size: 0.95rem; }
  .nav-links a.active::after { display: none; }
  .nav-toggle { display: grid; }
}

/* ───────── Hero — editorial poster ───────── */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; padding: 8.5rem 0 5.5rem; overflow: hidden; }
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; opacity: 0.55; }
.hero::after { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(to bottom, transparent 50%, var(--paper) 99%); pointer-events: none; transition: background 0.6s var(--ease); }
.hero .container { position: relative; z-index: 2; }
.hero-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 3.2rem; align-items: center; }

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-ink);
  border: 1px solid var(--rule); background: var(--paper-glass);
  padding: 0.45rem 0.95rem; border-radius: 2px; margin-bottom: 1.9rem;
}
.hero-eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); animation: pulse 2.6s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.45; transform: scale(0.7); } }

.hero h1 {
  font-size: clamp(3rem, 8.2vw, 6.1rem);
  font-weight: 600; margin-bottom: 1.3rem;
  text-wrap: balance;
}
.hero h1 .grad {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--accent);
  font-style: italic; font-weight: 500;
}
[data-theme="dark"] .hero h1 .grad { -webkit-text-stroke: 1.2px var(--accent); }

/* Word-by-word reveal */
.hero h1 .w { display: inline-block; overflow: hidden; vertical-align: top; }
.hero h1 .w > span { display: inline-block; transform: translateY(108%); transition: transform 0.9s var(--ease-spring); }
.hero.ready h1 .w > span { transform: translateY(0); }

.hero-role { font-size: clamp(1.04rem, 2vw, 1.28rem); color: var(--ink-1); margin-bottom: 1.3rem; }
.hero-role b { color: var(--ink); font-weight: 600; }
.hero-lead { color: var(--ink-1); max-width: 52ch; margin-bottom: 2.1rem; font-size: 1.12rem; }
.hero-lead em { color: var(--ink); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.9rem; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-top: 2.4rem; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.76rem;
  color: var(--ink-1); background: var(--paper-card); border: 1px solid var(--rule);
  padding: 0.45rem 0.9rem; border-radius: 2px; transition: var(--t-surface);
}
.hero-badge:nth-child(1) { animation: drift 12s ease-in-out infinite alternate; }
.hero-badge:nth-child(2) { animation: drift2 15s ease-in-out infinite alternate; }
.hero-badge:nth-child(3) { animation: drift 18s ease-in-out infinite alternate-reverse; }
.hero-badge i { color: var(--accent-2); }

.hero-portrait { position: relative; justify-self: center; width: min(330px, 78vw); will-change: transform; animation: drift2 14s ease-in-out infinite alternate; }
.hero-portrait .frame {
  position: relative; border-radius: var(--radius-l); padding: 10px;
  background: var(--paper-card); border: 1px solid var(--ink);
  box-shadow: var(--shadow-lift); transition: var(--t-surface);
}
.hero-portrait img { width: 100%; border-radius: 3px; background: var(--paper-soft); aspect-ratio: 1/1; object-fit: cover; object-position: center 18%; filter: saturate(0.92) contrast(1.03); }
.hero-portrait .ring { position: absolute; inset: -18px; border-radius: 50%; border: 1px dashed var(--rule); animation: spinRing 40s linear infinite; opacity: 0.9; }
@keyframes spinRing { to { transform: rotate(360deg); } }
.hero-portrait .chip {
  position: absolute; bottom: -16px; left: 50%; transform: translateX(-50%); white-space: nowrap;
  background: var(--ink); color: var(--paper);
  font-family: var(--font-mono); font-size: 0.74rem; font-weight: 500;
  padding: 0.5rem 1rem; border-radius: 2px; box-shadow: var(--shadow-card);
  transition: var(--t-surface);
}
.hero-portrait .chip i { color: var(--accent-2); margin-right: 0.35rem; }

.scroll-cue { position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%); z-index: 2; color: var(--ink-2); font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.2em; text-transform: uppercase; display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.scroll-cue .line { width: 1px; height: 34px; background: linear-gradient(var(--accent), transparent); animation: cue 2.2s ease-in-out infinite; transform-origin: top; }
@keyframes cue { 0%,100% { opacity: 0.3; transform: scaleY(0.5); } 50% { opacity: 1; transform: scaleY(1); } }

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 2.6rem; }
  .hero-eyebrow, .hero-cta, .hero-badges { justify-content: center; }
  .hero-lead { margin-left: auto; margin-right: auto; }
  .hero-portrait { order: -1; }
}

/* ───────── Ticker (mono data readout marquee) ───────── */
.ticker {
  position: relative; z-index: 2; overflow: hidden;
  border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink);
  background: var(--paper-card);
  font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.06em;
  color: var(--ink-1); text-transform: uppercase;
  padding: 0.72rem 0;
  transition: var(--t-surface);
}
.ticker .tk-track { display: inline-flex; white-space: nowrap; animation: tick 46s linear infinite; will-change: transform; }
.ticker:hover .tk-track { animation-play-state: paused; }
.ticker .tk-item { padding: 0 1.4rem; display: inline-flex; align-items: center; gap: 0.8rem; }
.ticker .tk-item::after { content: "▚"; color: var(--accent); font-size: 0.7rem; margin-left: 1.4rem; }
@keyframes tick { to { transform: translateX(-50%); } }

/* ───────── Buttons ───────── */
.btn {
  position: relative; display: inline-flex; align-items: center; gap: 0.55rem;
  padding: 0.85rem 1.55rem; border-radius: 3px;
  font-family: var(--font-mono); font-weight: 600; font-size: 0.86rem;
  letter-spacing: 0.03em; text-transform: uppercase;
  cursor: pointer; border: 1px solid var(--ink); will-change: transform;
  transition: transform 0.45s var(--ease-spring), box-shadow 0.35s var(--ease), background 0.35s var(--ease), color 0.3s, border-color 0.3s;
}
.btn i { transition: transform 0.4s var(--ease-spring); }
.btn:hover i { transform: translateX(3px); }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: var(--shadow-pop); box-shadow: 6px 6px 0 rgba(25,21,18,0.22); transform: translate(-2px, -2px); }
[data-theme="dark"] .btn-primary { color: #0d0f0d; background: var(--ink); }
[data-theme="dark"] .btn-primary:hover { color: #0d0f0d; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); box-shadow: 5px 5px 0 var(--rule); transform: translate(-2px, -2px); }
.btn:active { transform: scale(0.96); }

/* ───────── Sections — numbered editorial ───────── */
main, body { counter-reset: sec; }
.section { padding: 6rem 0; position: relative; }
.section.alt { background: var(--paper-soft); transition: var(--t-surface); }

/* Frequency-ruler divider on alt sections */
.section.alt::before, .section.alt::after {
  content: ""; position: absolute; left: 0; right: 0; height: 9px;
  background:
    repeating-linear-gradient(90deg,
      var(--rule) 0, var(--rule) 1px, transparent 1px, transparent 12px),
    repeating-linear-gradient(90deg,
      var(--ink) 0, var(--ink) 1px, transparent 1px, transparent 96px);
  opacity: 0.55;
}
.section.alt::before { top: 0; border-top: 1px solid var(--rule); }
.section.alt::after { bottom: 0; border-bottom: 1px solid var(--rule); }

.section-head { position: relative; max-width: 720px; margin: 0 auto 3.6rem; text-align: center; }
.section-head.left { text-align: left; margin-left: 0; }

/* Giant outlined section numeral */
.section-head::before {
  counter-increment: sec;
  content: counter(sec, decimal-leading-zero);
  position: absolute; top: -4.2rem; left: 50%; transform: translateX(-50%);
  font-family: var(--font-display); font-weight: 700; font-style: italic;
  font-size: clamp(5.5rem, 12vw, 9rem); line-height: 1;
  color: transparent; -webkit-text-stroke: 1px var(--rule);
  z-index: -1; pointer-events: none; user-select: none;
  animation: drift 14s ease-in-out infinite alternate;
}
.section-head.left::before { left: 0; transform: none; }

.section-kicker { display: inline-flex; align-items: center; gap: 0.55rem; font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent-ink); margin-bottom: 1.1rem; }
.section-kicker::before, .section-kicker::after { content: ""; width: 26px; height: 1px; background: var(--accent); display: inline-block; }
.section-head.left .section-kicker::before, .section-head.left .section-kicker::after { display: none; }
.section-title { font-size: clamp(2.1rem, 4.6vw, 3.3rem); margin-bottom: 1rem; text-wrap: balance; }
.section-title em { font-style: italic; color: var(--accent-ink); }
.section-sub { color: var(--ink-2); font-size: 1.08rem; }

/* ───────── Cards — printed plates ───────── */
.grid { display: grid; gap: 1.4rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.card {
  position: relative; background: var(--paper-card);
  border: 1px solid var(--rule); border-radius: var(--radius); padding: 2rem;
  box-shadow: var(--shadow-card); overflow: hidden;
  transform-style: preserve-3d;
  transition: transform 0.5s var(--ease-out), border-color 0.4s, box-shadow 0.45s var(--ease), background 0.55s var(--ease);
}
.card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(24rem 18rem at var(--mx, 50%) var(--my, 0%), var(--accent-glow), transparent 62%);
  opacity: 0; transition: opacity 0.45s var(--ease);
}
.card:hover { transform: translate(-3px, -6px); border-color: var(--ink); box-shadow: var(--shadow-lift); }
.card:hover::before { opacity: 0.35; }
.card h3 { color: var(--ink); margin-bottom: 0.7rem; font-size: 1.24rem; }
.card p { color: var(--ink-1); font-size: 1rem; }
.card-icon {
  display: grid; place-items: center; width: 3rem; height: 3rem; border-radius: 3px;
  background: var(--paper-soft); border: 1px solid var(--rule); color: var(--accent-ink);
  font-size: 1.15rem; margin-bottom: 1.3rem;
  transition: transform 0.5s var(--ease-spring), color 0.3s, background 0.55s var(--ease), border-color 0.3s;
}
.card:hover .card-icon { transform: translateY(-3px) rotate(-6deg); color: var(--accent-2); border-color: var(--ink); }

.ticks { list-style: none; margin-top: 0.6rem; }
.ticks li { position: relative; padding-left: 1.6rem; margin-bottom: 0.55rem; color: var(--ink-1); font-size: 0.98rem; }
.ticks li::before { content: "\f0da"; font-family: "Font Awesome 6 Free"; font-weight: 900; position: absolute; left: 0.2rem; top: 0.1rem; color: var(--accent); font-size: 0.78rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.chip-tag { font-family: var(--font-mono); font-size: 0.76rem; color: var(--ink-1); background: var(--paper-soft); border: 1px solid var(--rule); padding: 0.4rem 0.8rem; border-radius: 2px; transition: var(--t-surface); }
.chip-tag.brand { color: var(--accent-ink); border-color: var(--accent); background: transparent; }

/* ───────── Stats — editorial figures ───────── */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 0; border: 1px solid var(--ink); border-radius: var(--radius); overflow: hidden; background: var(--paper-card); transition: var(--t-surface); }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat { text-align: center; padding: 2.4rem 1rem 2.1rem; border-right: 1px solid var(--rule); transition: background 0.4s var(--ease); position: relative; }
.stat:last-child { border-right: none; }
@media (max-width: 720px) { .stat:nth-child(2) { border-right: none; } .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--rule); } }
.stat:hover { background: var(--paper-soft); }
.stat .num { font-family: var(--font-display); font-weight: 600; font-style: italic; font-size: clamp(2.5rem, 5.5vw, 3.4rem); color: var(--ink); line-height: 1; letter-spacing: -0.02em; }
.stat .num::after { content: ""; display: block; width: 28px; height: 2px; background: var(--accent); margin: 0.7rem auto 0; }
.stat .label { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; margin-top: 0.7rem; }

/* ───────── Timeline ───────── */
.timeline { position: relative; max-width: 800px; margin: 0 auto; padding-left: 2.2rem; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 8px; bottom: 8px; width: 1px; background: var(--ink); opacity: 0.35; }
.tl-item { position: relative; margin-bottom: 1.5rem; }
.tl-item::before { content: ""; position: absolute; left: -2.2rem; top: 2rem; margin-left: -5px; width: 11px; height: 11px; border-radius: 50%; background: var(--paper); border: 2px solid var(--accent); box-shadow: var(--glow); }
.tl-date { color: var(--accent-ink); font-family: var(--font-mono); font-size: 0.76rem; font-weight: 500; letter-spacing: 0.06em; margin-bottom: 0.35rem; }
.tl-item .inst { color: var(--ink-1); margin: 0.25rem 0; font-style: italic; }
.tl-item .meta { color: var(--ink-2); font-size: 0.95rem; }
.tl-item .grade { display: inline-flex; align-items: center; gap: 0.35rem; margin-top: 0.7rem; font-family: var(--font-mono); font-size: 0.74rem; color: var(--accent-2); background: var(--accent-2-soft); border: 1px solid var(--accent-2); padding: 0.28rem 0.75rem; border-radius: 2px; }

/* ───────── Feature band (awards) ───────── */
.feature { display: grid; grid-template-columns: auto 1fr; gap: 1.5rem; align-items: start; background: var(--paper-card); border: 1px solid var(--rule); border-radius: var(--radius-l); padding: 2.2rem; position: relative; overflow: hidden; box-shadow: var(--shadow-card); transition: var(--t-surface), transform 0.5s var(--ease-out); }
.feature:hover { transform: translate(-3px, -5px); border-color: var(--ink); box-shadow: var(--shadow-lift); }
.feature::after { content: ""; position: absolute; right: -28%; top: -60%; width: 55%; height: 200%; background: var(--grad-brand); opacity: 0.07; filter: blur(60px); }
.feature .medal { display: grid; place-items: center; width: 3.5rem; height: 3.5rem; border-radius: 3px; background: var(--accent-2-soft); border: 1px solid var(--accent-2); color: var(--accent-2); font-size: 1.4rem; animation: drift 13s ease-in-out infinite alternate; }
.feature h3 { margin-bottom: 0.4rem; }
.feature .when { color: var(--accent-2); font-family: var(--font-mono); font-size: 0.76rem; font-weight: 500; letter-spacing: 0.06em; }
@media (max-width: 560px) { .feature { grid-template-columns: 1fr; } }

/* ───────── Publications ───────── */
.pub-toolbar { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.filters { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.filter-btn { background: transparent; border: 1px solid var(--rule); color: var(--ink-1); padding: 0.5rem 1.1rem; border-radius: 2px; cursor: pointer; font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.04em; text-transform: uppercase; transition: var(--t-surface), transform 0.4s var(--ease-spring); }
.filter-btn:hover { border-color: var(--ink); color: var(--ink); transform: translateY(-2px); }
.filter-btn.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
[data-theme="dark"] .filter-btn.active { color: #0d0f0d; }
.search-wrap { position: relative; }
.search-wrap i { position: absolute; left: 0.95rem; top: 50%; transform: translateY(-50%); color: var(--ink-2); }
#searchInput { background: var(--paper-card); border: 1px solid var(--rule); color: var(--ink); padding: 0.65rem 1rem 0.65rem 2.5rem; border-radius: 2px; width: 270px; max-width: 62vw; font-family: var(--font-mono); font-size: 0.88rem; outline: none; transition: border-color 0.3s, background 0.55s var(--ease); }
#searchInput:focus { border-color: var(--accent); }
#searchInput::placeholder { color: var(--ink-2); }
.pub-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
@media (max-width: 820px) { .pub-grid { grid-template-columns: 1fr; } }
.pub { background: var(--paper-card); border: 1px solid var(--rule); border-radius: var(--radius); padding: 1.6rem; display: flex; flex-direction: column; transition: transform 0.45s var(--ease-out), border-color 0.35s, box-shadow 0.45s var(--ease), background 0.55s var(--ease); }
.pub:hover { transform: translate(-2px, -5px); border-color: var(--ink); box-shadow: var(--shadow-lift); }
.pub-top { display: flex; justify-content: space-between; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; }
.pub-type { font-family: var(--font-mono); font-size: 0.68rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; padding: 0.3rem 0.72rem; border-radius: 2px; border: 1px solid; }
.pub-type.journal { color: var(--accent-ink); border-color: var(--accent); background: transparent; }
.pub-type.conference { color: var(--accent-2); border-color: var(--accent-2); background: transparent; }
.pub-type.preprint { color: var(--indigo); border-color: var(--indigo); background: transparent; }
.pub-type.report, .pub-type.other { color: var(--ink-1); background: var(--paper-soft); border-color: var(--rule); }
.pub-year { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.78rem; }
.pub h3 { font-size: 1.06rem; line-height: 1.35; margin-bottom: 0.6rem; }
.pub .authors { color: var(--ink-2); font-size: 0.88rem; margin-bottom: 0.35rem; }
.pub .venue { color: var(--ink-1); font-size: 0.9rem; font-style: italic; margin-bottom: 0.85rem; }
.pub-foot { margin-top: auto; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.pub-cite { color: var(--accent-2); font-family: var(--font-mono); font-size: 0.78rem; }
.pub-cite i { margin-right: 0.3rem; }
.pub .chips { margin-top: 0.9rem; }
/* Publications toolbar controls: sort + view toggle */
.pub-controls { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }
.sort-select { background: transparent; border: 1px solid var(--rule); color: var(--ink-1); font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.03em; padding: 0.5rem 0.7rem; border-radius: 2px; cursor: pointer; }
.sort-select:hover { border-color: var(--ink); }
.view-toggle { display: flex; border: 1px solid var(--rule); border-radius: 2px; overflow: hidden; }
.view-btn { background: transparent; border: none; color: var(--ink-2); padding: 0.5rem 0.72rem; cursor: pointer; display: flex; align-items: center; transition: var(--t-surface); }
.view-btn:hover { color: var(--ink); }
.view-btn.active { background: var(--ink); color: var(--paper); }
[data-theme="dark"] .view-btn.active { color: #0d0f0d; }
/* List view */
.pub-grid.list { grid-template-columns: 1fr; gap: 0.55rem; }
.pub-grid.list .pub { flex-direction: row; flex-wrap: wrap; align-items: center; padding: 0.85rem 1.15rem; column-gap: 1rem; }
.pub-grid.list .pub:hover { transform: translateX(3px); }
.pub-grid.list .pub-top { margin-bottom: 0; gap: 0.6rem; flex: 0 0 auto; }
.pub-grid.list .pub h3 { margin-bottom: 0; font-size: 1rem; flex: 1 1 320px; }
.pub-grid.list .pub .authors { display: none; }
.pub-grid.list .pub .venue { margin-bottom: 0; flex: 1 1 100%; font-size: 0.82rem; }
.pub-grid.list .pub-foot { margin-top: 0; flex: 0 0 auto; }
.pub-grid.list .pub .chips { display: none; }
/* Year group headers */
.pub-year-head { grid-column: 1 / -1; font-family: var(--font-mono); font-size: 0.9rem; letter-spacing: 0.08em; color: var(--ink); margin: 1.4rem 0 0.3rem; padding-bottom: 0.35rem; border-bottom: 1px solid var(--rule); display: flex; align-items: center; gap: 0.6rem; }
.pub-year-head:first-child { margin-top: 0; }
.pub-year-head .yc { font-size: 0.7rem; color: var(--ink-2); background: var(--paper-soft); border: 1px solid var(--rule); border-radius: 2px; padding: 0.05rem 0.4rem; }
.pub-grid.list .pub-year-head { margin: 1rem 0 0.2rem; }
/* jsWolt 3D track viewer */
.view3d { margin-top: 0.6rem; display: inline-flex; align-items: center; gap: 0.45rem; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink-1); background: transparent; border: 1px solid var(--rule); border-radius: 2px; padding: 0.4rem 0.8rem; cursor: pointer; transition: var(--t-surface), transform 0.35s var(--ease-spring); }
.view3d:hover { border-color: var(--ink); color: var(--ink); transform: translateY(-2px); }
.rv-modal { position: fixed; inset: 0; z-index: 999; background: rgba(8,10,8,0.86); display: none; align-items: center; justify-content: center; }
.rv-modal.open { display: flex; }
.rv-modal .rv-frame { position: relative; width: min(1100px, 94vw); height: min(680px, 86vh); background: #0d0f0d; border-radius: 10px; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,0.5); }
.rv-modal iframe { width: 100%; height: 100%; border: 0; display: block; }
.rv-close { position: absolute; top: 10px; right: 10px; z-index: 5; width: 38px; height: 38px; border-radius: 50%; border: none; background: rgba(255,255,255,0.14); color: #fff; font-size: 20px; line-height: 1; cursor: pointer; }
.rv-close:hover { background: rgba(255,255,255,0.28); }

/* ───────── Projects ───────── */
.proj { display: flex; flex-direction: column; }
.proj .proj-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: 0.5rem; }
.proj .when { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.78rem; white-space: nowrap; }
.proj .sub { color: var(--accent-ink); font-size: 1rem; font-style: italic; margin-bottom: 1rem; }
.proj .kv { display: flex; gap: 0.5rem; font-size: 0.92rem; margin-bottom: 0.4rem; }
.proj .kv .k { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.78rem; min-width: 84px; }
.proj .kv .v { color: var(--ink-1); }
.proj.major { grid-column: 1 / -1; }

/* ───────── Tabs / semesters ───────── */
.tabs { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-bottom: 2rem; }
.tab-btn { background: transparent; border: 1px solid var(--rule); color: var(--ink-1); padding: 0.55rem 1.2rem; border-radius: 2px; cursor: pointer; font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.04em; text-transform: uppercase; transition: var(--t-surface), transform 0.4s var(--ease-spring); }
.tab-btn:hover { color: var(--ink); border-color: var(--ink); transform: translateY(-2px); }
.tab-btn.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
[data-theme="dark"] .tab-btn.active { color: #0d0f0d; }
.semester-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 820px) { .semester-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .semester-grid { grid-template-columns: 1fr; } }
.sem { background: var(--paper-card); border: 1px solid var(--rule); border-radius: var(--radius-s); padding: 1.3rem; transition: var(--t-surface), transform 0.45s var(--ease-out); }
.sem:hover { border-color: var(--ink); transform: translate(-2px, -3px); box-shadow: 5px 5px 0 var(--rule); }
.sem .term { display: inline-block; font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600; color: var(--paper); background: var(--ink); padding: 0.22rem 0.62rem; border-radius: 2px; margin-bottom: 0.75rem; }
[data-theme="dark"] .sem .term { color: #0d0f0d; }
.sem h4 { font-size: 1.04rem; margin-bottom: 0.3rem; }
.sem p { color: var(--ink-2); font-size: 0.88rem; font-style: italic; }

/* ───────── Demos ───────── */
.demo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
@media (max-width: 900px) { .demo-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .demo-grid { grid-template-columns: 1fr; } }
.demo { display: flex; flex-direction: column; }
.demo .thumb { height: 150px; border-radius: 3px; margin-bottom: 1.2rem; display: grid; place-items: center; font-size: 2.6rem; position: relative; overflow: hidden; border: 1px solid var(--rule); transition: transform 0.5s var(--ease-out); }
.demo:hover .thumb { transform: translateY(-4px); }
.demo .thumb.g1 { background: linear-gradient(140deg, rgba(12,122,90,0.14), rgba(12,122,90,0.03)); color: var(--accent-ink); }
.demo .thumb.g2 { background: linear-gradient(140deg, rgba(176,104,16,0.14), rgba(176,104,16,0.03)); color: var(--accent-2); }
.demo .thumb.g3 { background: linear-gradient(140deg, rgba(76,67,112,0.14), rgba(76,67,112,0.03)); color: var(--indigo); }
.demo .thumb::after { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.22), transparent 55%); }
.demo .tag-row { display: flex; gap: 0.4rem; flex-wrap: wrap; margin: 0.4rem 0 1rem; }
.demo .btn { margin-top: auto; align-self: flex-start; }
.demo code { background: var(--paper-soft); padding: 0.05rem 0.4rem; border-radius: 2px; font-family: var(--font-mono); font-size: 0.85em; color: var(--accent-ink); }

/* ───────── Hobbies ───────── */
.hobby-link { display: inline-flex; align-items: center; gap: 0.45rem; margin-top: 1rem; color: var(--accent-ink); font-family: var(--font-mono); font-size: 0.86rem; letter-spacing: 0.02em; transition: gap 0.4s var(--ease-spring), color 0.3s; }
.hobby-link:hover { color: var(--accent-2); gap: 0.7rem; }
.track-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1.25rem; }
.track { background: var(--paper-card); border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; transition: transform 0.5s var(--ease-out), border-color 0.35s, box-shadow 0.45s var(--ease); }
.track:hover { transform: translate(-2px, -5px); border-color: var(--ink); box-shadow: var(--shadow-lift); }
.track .tw { aspect-ratio: 4/3; overflow: hidden; background: var(--paper-soft); }
.track .tw img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.7s var(--ease); }
.track:hover .tw img { transform: scale(1.08); }
.track .tb { padding: 1rem; }
.track .tb h4 { font-size: 1rem; margin-bottom: 0.3rem; }
.track .tb p { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.78rem; margin: 0; }

.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
@media (max-width: 720px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-card { text-align: center; }
.contact-card .card-icon { margin: 0 auto 1.1rem; }
.contact-card .v { color: var(--ink-1); font-size: 0.9rem; font-family: var(--font-mono); }
.cta-band { text-align: center; max-width: 740px; margin: 0 auto; background: var(--paper-card); border: 1px solid var(--ink); border-radius: var(--radius-l); padding: 3.2rem 2rem; position: relative; overflow: hidden; box-shadow: var(--shadow-lift); transition: var(--t-surface); }
.cta-band::after { content: ""; position: absolute; inset: 0; background: var(--grad-brand); opacity: 0.05; pointer-events: none; }
.cta-band > * { position: relative; }
.cta-band h2 { margin-bottom: 0.8rem; }
.cta-band p { color: var(--ink-2); margin-bottom: 1.8rem; }

.footer { background: var(--paper-soft); border-top: 1px solid var(--ink); padding: 3rem 0 2.3rem; margin-top: 2rem; transition: var(--t-surface); position: relative; }
.footer::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 9px;
  background:
    repeating-linear-gradient(90deg, var(--rule) 0, var(--rule) 1px, transparent 1px, transparent 12px),
    repeating-linear-gradient(90deg, var(--ink) 0, var(--ink) 1px, transparent 1px, transparent 96px);
  opacity: 0.55;
}
.footer-inner { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: space-between; align-items: center; }
.footer .social { display: flex; gap: 0.55rem; }
.footer .social a { display: grid; place-items: center; width: 2.55rem; height: 2.55rem; border-radius: 3px; background: transparent; border: 1px solid var(--rule); color: var(--ink-1); font-size: 1rem; transition: var(--t-surface), transform 0.45s var(--ease-spring), color 0.3s, border-color 0.3s; }
.footer .social a:hover { color: var(--accent-ink); border-color: var(--ink); transform: translateY(-3px); }
.footer .copy { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.78rem; }

.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease-spring); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.09s; }
.reveal.d2 { transition-delay: 0.18s; }
.reveal.d3 { transition-delay: 0.27s; }
.reveal.d4 { transition-delay: 0.36s; }
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; } .mt-3 { margin-top: 3rem; }
.lead-narrow { max-width: 760px; margin: 0 auto; color: var(--ink-1); }

::view-transition-old(root), ::view-transition-new(root) { mix-blend-mode: normal; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .hero h1 .w > span { transform: none; }
  .ticker .tk-track { animation: none; }
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
::selection { background: rgba(12, 122, 90, 0.25); color: var(--ink); }
[data-theme="dark"] ::selection { background: rgba(60, 230, 164, 0.28); }