/* ==========================================================================
   Shahid Azam — Portfolio
   Design system + layout + components + motion
   ========================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
  /* Colour */
  --bg: #05070d;
  --bg-2: #0a0f1c;
  --bg-3: #0f1628;
  --surface: rgba(16, 23, 42, 0.55);
  --surface-strong: rgba(19, 28, 51, 0.82);
  --border: rgba(148, 163, 255, 0.12);
  --border-strong: rgba(148, 163, 255, 0.26);
  --text: #e7ecf6;
  --text-2: #b3bdd3;
  --muted: #8d99b4;
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --sky: #60a5fa;
  --violet: #8b5cf6;
  --purple: #a855f7;
  --green: #34d399;
  --grad: linear-gradient(110deg, var(--cyan) 0%, var(--blue) 45%, var(--violet) 80%, var(--purple) 100%);
  --grad-soft: linear-gradient(135deg, rgba(34, 211, 238, 0.16), rgba(139, 92, 246, 0.16));

  /* Typography */
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: clamp(1.15rem, 1rem + 0.6vw, 1.35rem);
  --fs-h3: clamp(1.15rem, 1.05rem + 0.4vw, 1.35rem);
  --fs-h2: clamp(2rem, 1.4rem + 2.6vw, 3.4rem);
  --fs-h1: clamp(2.8rem, 1.6rem + 5.4vw, 5.6rem);

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4.5rem;
  --sp-9: clamp(4.5rem, 3rem + 6vw, 8rem);

  /* Shape, depth, motion */
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.7);
  --glow: 0 0 0 1px rgba(96, 165, 250, 0.25), 0 10px 40px -10px rgba(59, 130, 246, 0.45);
  --blur: blur(14px) saturate(140%);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 180ms;
  --t: 320ms;
  --t-slow: 800ms;

  --container: 1200px;
  --header-h: 72px;
}

/* ---------- 2. Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.menu-open { overflow: hidden; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0;
  font-weight: 600;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
strong { color: var(--text); font-weight: 600; }

::selection { background: rgba(59, 130, 246, 0.4); color: #fff; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: fixed; left: 1rem; top: -100px; z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--blue); color: #fff; border-radius: var(--radius-sm);
  transition: top var(--t-fast);
}
.skip-link:focus { top: 1rem; }

.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

/* Icons */
.ic {
  width: 1.15em; height: 1.15em;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- 3. Atmosphere ---------- */
.bg-atmosphere {
  position: fixed; inset: 0; z-index: -1;
  pointer-events: none; overflow: hidden;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(59, 130, 246, 0.12), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(139, 92, 246, 0.1), transparent 60%),
    var(--bg);
}

.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 30%, transparent 75%);
}

.aurora {
  position: absolute;
  width: 46vmax; height: 46vmax;
  border-radius: 50%;
  opacity: 0.5;
  will-change: transform;
}
.aurora-1 { background: radial-gradient(circle, rgba(34, 211, 238, 0.18), transparent 65%); top: -18vmax; right: -10vmax; animation: drift 26s ease-in-out infinite alternate; }
.aurora-2 { background: radial-gradient(circle, rgba(139, 92, 246, 0.16), transparent 65%); top: 40vh; left: -20vmax; animation: drift 32s ease-in-out infinite alternate-reverse; }
.aurora-3 { background: radial-gradient(circle, rgba(59, 130, 246, 0.12), transparent 65%); bottom: -25vmax; right: 10vw; animation: drift 38s ease-in-out infinite alternate; }

@keyframes drift {
  to { transform: translate3d(6vmax, 4vmax, 0) scale(1.08); }
}

/* Scroll progress */
.scroll-progress {
  position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 120;
  pointer-events: none;
}
.scroll-progress span {
  display: block; height: 100%;
  background: var(--grad);
  transform-origin: 0 50%;
  transform: scaleX(var(--progress, 0));
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.6);
}

/* Cursor glow (enabled by JS on fine pointers only) */
.cursor-glow {
  position: fixed; left: 0; top: 0; z-index: 0;
  width: 420px; height: 420px; margin: -210px 0 0 -210px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.09), transparent 65%);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--t);
  will-change: transform;
}
.cursor-glow.is-on { opacity: 1; }

/* ---------- 4. Shared components ---------- */
.text-gradient,
.section-title em {
  font-style: normal;
  background: var(--grad);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradient-pan 8s ease-in-out infinite alternate;
}

@keyframes gradient-pan {
  to { background-position: 100% 0; }
}

.hl {
  background: none;
  color: var(--cyan);
  font-weight: 500;
  position: relative;
  white-space: nowrap;
}
.hl::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0.05em; height: 2px;
  background: var(--grad);
  transform: scaleX(0); transform-origin: left;
  animation: underline 900ms var(--ease) 1.2s forwards;
}
@keyframes underline { to { transform: scaleX(1); } }

.kw {
  color: var(--sky);
  font-weight: 500;
}

.live-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  animation: live 2.2s ease-out infinite;
  flex-shrink: 0;
}
@keyframes live {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
  100% { box-shadow: 0 0 0 10px rgba(52, 211, 153, 0); }
}

.status-badge {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.45rem 0.9rem 0.45rem 0.75rem;
  font-family: var(--font-mono); font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--text-2);
  background: rgba(52, 211, 153, 0.06);
  border: 1px solid rgba(52, 211, 153, 0.22);
  border-radius: 999px;
}

/* Buttons */
.btn {
  --btn-pad: 0.85rem 1.35rem;
  position: relative;
  display: inline-flex; align-items: center; justify-content: center; gap: 0.55rem;
  min-height: 46px;
  padding: var(--btn-pad);
  font-family: var(--font-display); font-weight: 500; font-size: 0.97rem;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t) var(--ease), background-color var(--t), border-color var(--t), color var(--t);
  isolation: isolate;
  white-space: nowrap;
}
.btn .ic { transition: transform var(--t) var(--ease); }
.btn:hover .ic { transform: translate(2px, -2px); }
.btn:active { transform: translateY(1px) scale(0.99); }
.btn[hidden] { display: none; }

.btn-primary {
  color: #fff;
  background: linear-gradient(110deg, #0ea5e9, var(--blue) 50%, var(--violet));
  box-shadow: 0 8px 30px -10px rgba(59, 130, 246, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}
.btn-primary:hover { box-shadow: 0 12px 40px -8px rgba(59, 130, 246, 0.95), inset 0 1px 0 rgba(255, 255, 255, 0.25); transform: translateY(-2px); }

.btn-ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-strong);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.btn-ghost:hover { border-color: rgba(34, 211, 238, 0.55); background: rgba(34, 211, 238, 0.07); transform: translateY(-2px); }

.btn-sm { --btn-pad: 0.55rem 0.95rem; min-height: 40px; font-size: var(--fs-sm); border-radius: 10px; }
.btn-lg { --btn-pad: 1rem 1.6rem; min-height: 54px; font-size: 1rem; }

.icon-btn {
  display: grid; place-items: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  color: var(--text-2);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  transition: color var(--t), border-color var(--t), transform var(--t-fast) var(--ease), box-shadow var(--t);
}
.icon-btn .ic { width: 20px; height: 20px; }
.icon-btn:hover { color: #fff; border-color: rgba(34, 211, 238, 0.5); transform: translateY(-3px); box-shadow: 0 10px 24px -10px rgba(34, 211, 238, 0.6); }

.text-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  color: var(--cyan);
  font-family: var(--font-display); font-weight: 500;
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat;
  transition: background-size var(--t) var(--ease);
  padding-bottom: 2px;
}
.text-link:hover { background-size: 100% 1px; }

/* Tags */
.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.tags li {
  font-family: var(--font-mono); font-size: 0.72rem;
  padding: 0.3rem 0.6rem;
  color: var(--text-2);
  background: rgba(96, 165, 250, 0.07);
  border: 1px solid rgba(96, 165, 250, 0.16);
  border-radius: 7px;
  transition: color var(--t), border-color var(--t), background var(--t);
}
.card:hover .tags li { border-color: rgba(34, 211, 238, 0.28); }

/* Glass card with pointer spotlight */
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: var(--shadow);
  transition: border-color var(--t), transform var(--t) var(--ease), box-shadow var(--t);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(380px circle at var(--mx, 50%) var(--my, 0%), rgba(59, 130, 246, 0.12), transparent 60%);
  opacity: 0;
  transition: opacity var(--t);
  pointer-events: none;
}
.card:hover::before { opacity: 1; }
.card > * { position: relative; z-index: 1; }
.card:hover { border-color: var(--border-strong); }

.card-icon {
  display: grid; place-items: center;
  width: 46px; height: 46px;
  border-radius: 13px;
  color: var(--cyan);
  background: var(--grad-soft);
  border: 1px solid rgba(96, 165, 250, 0.22);
}
.card-icon .ic { width: 22px; height: 22px; }

/* ---------- 5. Header / navigation ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  transition: background-color var(--t), border-color var(--t), backdrop-filter var(--t);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(5, 7, 13, 0.72);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom-color: var(--border);
}

.nav {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-5);
}

.brand { display: inline-flex; align-items: center; gap: 0.7rem; }
.brand-mark {
  display: grid; place-items: center;
  width: 40px; height: 40px;
  border-radius: 12px;
  font-family: var(--font-display); font-weight: 700; font-size: 0.95rem;
  color: #fff;
  background: var(--grad);
  box-shadow: 0 6px 20px -6px rgba(59, 130, 246, 0.8);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-family: var(--font-display); font-size: 1rem; }
.brand-text small { font-family: var(--font-mono); font-size: 0.66rem; color: var(--muted); letter-spacing: 0.03em; }

.nav-menu { display: flex; align-items: center; gap: var(--sp-4); }
.nav-links { display: flex; gap: 0.15rem; }
.nav-links a {
  position: relative;
  display: block;
  padding: 0.5rem 0.7rem;
  font-size: 0.9rem;
  color: var(--text-2);
  border-radius: 8px;
  transition: color var(--t);
}
.nav-links a::after {
  content: ""; position: absolute; left: 0.7rem; right: 0.7rem; bottom: 0.25rem; height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--t) var(--ease);
}
.nav-links a:hover, .nav-links a.is-active { color: #fff; }
.nav-links a:hover::after, .nav-links a.is-active::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  padding: 0;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-strong);
  position: relative;
}
.nav-toggle .bar {
  position: absolute; left: 12px; right: 12px; height: 2px; border-radius: 2px;
  background: var(--text);
  transition: transform var(--t) var(--ease), opacity var(--t-fast);
}
.nav-toggle .bar:nth-child(1) { top: 15px; }
.nav-toggle .bar:nth-child(2) { top: 21px; }
.nav-toggle .bar:nth-child(3) { top: 27px; }
.nav-toggle[aria-expanded="true"] .bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  align-items: center;
  gap: var(--sp-7);
  padding-block: calc(var(--header-h) + var(--sp-7)) var(--sp-8);
}

.hero-network {
  position: absolute;
  top: 0; bottom: 0; left: 50%;
  width: 100vw; height: 100%;
  transform: translateX(-50%);
  z-index: -1;
  opacity: 0.55;
  mask-image: linear-gradient(to bottom, #000 55%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, #000 55%, transparent);
  pointer-events: none;
}
.net-nodes circle { fill: var(--bg-2); stroke: var(--sky); stroke-width: 1.5; animation: node-pulse 4s ease-in-out infinite; }
.net-nodes circle:nth-child(3n) { animation-delay: -1.3s; stroke: var(--cyan); }
.net-nodes circle:nth-child(3n + 1) { animation-delay: -2.6s; stroke: var(--violet); }
@keyframes node-pulse { 50% { opacity: 0.35; } }

.pulse {
  stroke-dasharray: 60 1400;
  animation: travel 7s linear infinite;
}
.pulse.p1 { stroke: var(--cyan); }
.pulse.p2 { stroke: var(--violet); animation-duration: 9s; animation-delay: -3s; }
.pulse.p3 { stroke: var(--sky); animation-duration: 8s; animation-delay: -5s; }
@keyframes travel {
  from { stroke-dashoffset: 1460; }
  to { stroke-dashoffset: 0; }
}

.hero-copy { position: relative; z-index: 2; min-width: 0; }

.hero-hello {
  margin-top: var(--sp-5);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-title {
  margin-top: var(--sp-2);
  font-size: var(--fs-h1);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1;
}

.hero-role {
  display: flex; align-items: center; gap: 0.6rem;
  min-height: 2.2em;              /* reserves the line so typing never shifts layout */
  margin-top: var(--sp-4);
  font-family: var(--font-mono);
  font-size: clamp(1rem, 0.9rem + 0.6vw, 1.3rem);
  color: var(--text);
  white-space: nowrap;
}
.role-prompt { color: var(--cyan); }
.typed { color: var(--text); }
.caret {
  width: 2px; height: 1.2em;
  margin-left: -0.35rem;
  background: var(--cyan);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-lead {
  max-width: 34rem;
  margin-top: var(--sp-4);
  font-size: var(--fs-lg);
  color: var(--text-2);
  line-height: 1.6;
}
.hero-lead strong { font-weight: 500; }

.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin-top: var(--sp-6); }
.social-row { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-top: var(--sp-6); }

/* Entrance choreography */
.hero-in { animation: hero-in 900ms var(--ease) both; animation-delay: calc(var(--d, 0) * 90ms + 100ms); }
@keyframes hero-in {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

/* Portrait */
.hero-visual {
  position: relative;
  justify-self: center;
  width: min(100%, 470px);
  aspect-ratio: 1;
  z-index: 1;
}

.orbits {
  position: absolute; inset: -6%;
  width: 112%; height: 112%;
  overflow: visible;
}
.ring { fill: none; }
.ring-dash { stroke: rgba(148, 163, 255, 0.22); stroke-width: 1; stroke-dasharray: 2 10; transform-origin: 260px 260px; animation: spin 80s linear infinite; }
.ring-grad { stroke-width: 1.2; opacity: 0.6; stroke-dasharray: 260 80 40 80; transform-origin: 260px 260px; animation: spin 40s linear infinite reverse; }
.orbit-spin { transform-origin: 260px 260px; }
.orbit-a { animation: spin 24s linear infinite; }
.orbit-b { animation: spin 36s linear infinite reverse; }
.sat-cyan { fill: var(--cyan); filter: drop-shadow(0 0 6px var(--cyan)); }
.sat-violet { fill: var(--violet); filter: drop-shadow(0 0 6px var(--violet)); }
.ticks path { stroke: rgba(148, 163, 255, 0.35); stroke-width: 1.5; }
@keyframes spin { to { transform: rotate(360deg); } }

.portrait-frame {
  position: absolute; inset: 13%;
  border-radius: 50%;
  padding: 5px;
  isolation: isolate;
  box-shadow: 0 0 60px -6px rgba(34, 211, 238, 0.35), 0 0 120px -20px rgba(139, 92, 246, 0.5);
}
.portrait-frame::before {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--cyan), var(--blue), var(--violet), var(--purple), var(--cyan));
  animation: spin 10s linear infinite;
}
.portrait-frame::after {
  content: "";
  position: absolute; inset: -14px; z-index: -2;
  border-radius: 50%;
  background: conic-gradient(from 180deg, rgba(34, 211, 238, 0.35), transparent 30%, rgba(139, 92, 246, 0.35) 60%, transparent 85%);
  filter: blur(18px);
  animation: spin 14s linear infinite reverse;
}
.portrait-inner {
  position: relative;
  width: 100%; height: 100%;
  border-radius: 50%;
  overflow: hidden;
  background: radial-gradient(circle at 50% 30%, var(--bg-3), var(--bg));
  border: 4px solid var(--bg);
}
.portrait {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: 50% 30%;
  transition: transform var(--t-slow) var(--ease);
}
.hero-visual:hover .portrait { transform: scale(1.04); }
.portrait-fallback {
  display: none;
  position: absolute; inset: 0;
  place-items: center;
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(3rem, 10vw, 5.5rem);
  letter-spacing: -0.04em;
  color: transparent;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
}
.portrait-inner.is-fallback .portrait { display: none; }
.portrait-inner.is-fallback .portrait-fallback { display: grid; }

.float-chip {
  position: absolute;
  display: inline-flex; align-items: center; gap: 0.45rem;
  padding: 0.5rem 0.8rem;
  font-family: var(--font-mono); font-size: 0.75rem;
  color: var(--text);
  background: var(--surface-strong);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: var(--shadow);
  animation: float 6s ease-in-out infinite;
  white-space: nowrap;
}
.float-chip .ic { color: var(--cyan); }
.chip-1 { top: 8%; left: -2%; }
.chip-2 { top: 18%; right: -8%; animation-delay: -2s; }
.chip-2 .ic { color: var(--violet); }
.chip-3 { bottom: 20%; right: -6%; animation-delay: -4s; }
@keyframes float { 50% { transform: translateY(-10px); } }

.code-card {
  position: absolute; left: -16%; bottom: -2%;
  width: 280px;
  margin: 0;
  background: rgba(8, 12, 24, 0.88);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.8), var(--glow);
  overflow: hidden;
  animation: float 8s ease-in-out infinite;
  animation-delay: -3s;
}
.code-head {
  display: flex; align-items: center; gap: 6px;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}
.code-head span { width: 9px; height: 9px; border-radius: 50%; background: #f87171; }
.code-head span:nth-child(2) { background: #fbbf24; }
.code-head span:nth-child(3) { background: #34d399; }
.code-head figcaption { margin-left: auto; font-family: var(--font-mono); font-size: 0.68rem; color: var(--muted); }
pre {
  margin: 0;
  padding: 0.9rem 1rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: #c9d4ea;
  overflow-x: auto;
}
code { font-family: inherit; }
pre .k { color: #c084fc; }
pre .n { color: #fbbf24; }
pre .b { color: var(--cyan); }
pre .s { color: #86efac; }
pre .c { color: #64748b; font-style: italic; }

.scroll-cue {
  position: absolute; left: 50%; bottom: var(--sp-5);
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.7rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted);
  transition: color var(--t);
}
.scroll-cue:hover { color: var(--text); }
.mouse {
  width: 22px; height: 34px;
  border: 1.5px solid currentColor;
  border-radius: 12px;
  display: flex; justify-content: center;
  padding-top: 6px;
}
.mouse span { width: 3px; height: 7px; border-radius: 2px; background: var(--cyan); animation: wheel 1.8s var(--ease) infinite; }
@keyframes wheel {
  0% { opacity: 0; transform: translateY(-2px); }
  30% { opacity: 1; }
  100% { opacity: 0; transform: translateY(10px); }
}

/* Ticker */
.ticker {
  position: relative;
  overflow: hidden;
  border-block: 1px solid var(--border);
  background: rgba(10, 15, 28, 0.6);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.ticker-track { display: flex; width: max-content; animation: marquee 38s linear infinite; }
.ticker:hover .ticker-track { animation-play-state: paused; }
.ticker ul { display: flex; flex-shrink: 0; }
.ticker li {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 1.1rem 2.2rem;
  font-family: var(--font-display); font-size: 1.05rem;
  color: var(--text-2);
  white-space: nowrap;
}
.ticker li .ic { color: var(--cyan); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 7. Sections ---------- */
.section { padding-block: var(--sp-9); position: relative; }

.section-head { max-width: 46rem; margin-bottom: var(--sp-7); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.7rem;
  font-family: var(--font-mono); font-size: var(--fs-xs);
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--muted);
}
.eyebrow span { color: var(--cyan); }
.eyebrow::after {
  content: ""; width: 56px; height: 1px;
  background: var(--grad);
  transform: scaleX(0); transform-origin: left;
  transition: transform 900ms var(--ease) 200ms;
}
.no-js .eyebrow::after, .eyebrow.is-visible::after { transform: scaleX(1); }

.eyebrow-sm {
  font-family: var(--font-mono); font-size: 0.7rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--cyan);
}

.section-title {
  margin-top: var(--sp-4);
  font-size: var(--fs-h2);
  font-weight: 600;
  letter-spacing: -0.03em;
}
.section-sub { margin-top: var(--sp-4); font-size: var(--fs-md); color: var(--text-2); max-width: 40rem; }

/* Split-word heading reveal (JS wraps words) */
.split.is-split em { background: none; animation: none; color: inherit; }
.split .w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: 0.08em; margin-bottom: -0.08em; }
.split .w > span {
  display: inline-block;
  transform: translateY(105%);
  transition: transform 900ms var(--ease);
  transition-delay: calc(var(--i, 0) * 55ms);
}
.split.is-split em .w > span {
  background: var(--grad);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.split.is-visible .w > span { transform: none; }

/* Generic scroll reveal */
.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity var(--t-slow) var(--ease) var(--rd, 0ms),
    transform var(--t-slow) var(--ease) var(--rd, 0ms),
    border-color var(--t), box-shadow var(--t);
}
.js .reveal.is-visible { opacity: 1; transform: none; }
/* After the entrance finishes, hand back snappy hover transitions */
.js .reveal.is-done {
  transition: opacity var(--t), transform var(--t) var(--ease), border-color var(--t), box-shadow var(--t);
}

/* Pause decorative hero loops while the hero is off-screen */
.hero.is-paused *, .hero.is-paused *::before, .hero.is-paused *::after { animation-play-state: paused !important; }

/* Circuit divider */
.divider { height: 40px; opacity: 0.7; }
.divider svg { width: 100%; height: 100%; overflow: visible; }
.divider path { fill: none; stroke: rgba(96, 165, 250, 0.35); stroke-width: 1; vector-effect: non-scaling-stroke; }
.divider circle { fill: var(--bg); stroke: var(--sky); stroke-width: 1.2; vector-effect: non-scaling-stroke; }
.divider .pulse-dot { fill: var(--cyan); stroke: none; animation: node-pulse 2.4s ease-in-out infinite; }
.js .divider .draw { stroke-dasharray: 1400; stroke-dashoffset: 1400; transition: stroke-dashoffset 2s var(--ease); }
.js .divider.is-visible .draw { stroke-dashoffset: 0; }

/* ---------- 8. About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--sp-5);
}
.about-bio { padding: var(--sp-6); display: flex; flex-direction: column; gap: var(--sp-4); }
.about-bio h3 { font-size: 1.6rem; margin-top: var(--sp-2); }
.about-bio p { color: var(--text-2); }
.about-bio .text-link { margin-top: auto; align-self: flex-start; }

.facts {
  display: grid; gap: 0;
  margin: var(--sp-2) 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.facts div { display: grid; grid-template-columns: 7rem 1fr; gap: var(--sp-3); padding: 0.75rem 1rem; }
.facts div + div { border-top: 1px solid var(--border); }
.facts dt { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; padding-top: 0.15rem; }
.facts dd { margin: 0; font-size: var(--fs-sm); color: var(--text); }

.about-side { display: flex; flex-direction: column; gap: var(--sp-4); }
.principles { display: flex; flex-direction: column; gap: var(--sp-4); }
.principle { display: flex; gap: var(--sp-4); padding: var(--sp-5); align-items: flex-start; }
.principle:hover { transform: translateX(4px); }
.principle-num {
  font-family: var(--font-mono); font-size: var(--fs-sm); font-weight: 500;
  color: var(--cyan);
  padding: 0.35rem 0.55rem;
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 8px;
}
.principle h3 { font-size: 1.1rem; }
.principle p { margin-top: 0.3rem; color: var(--text-2); font-size: 0.95rem; }

.goal { display: flex; gap: var(--sp-4); padding: var(--sp-5); background: linear-gradient(135deg, rgba(34, 211, 238, 0.08), rgba(139, 92, 246, 0.1)); }
.goal-ic { width: 26px; height: 26px; color: var(--violet); margin-top: 0.15rem; }
.goal p { color: var(--text-2); font-size: 0.95rem; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: var(--sp-6);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  overflow: hidden;
}
.stats li { padding: var(--sp-5) var(--sp-5); display: flex; flex-direction: column; gap: 0.25rem; }
.stats li + li { border-left: 1px solid var(--border); }
.stats strong {
  font-family: var(--font-display); font-size: clamp(2rem, 1.6rem + 1.5vw, 2.8rem); font-weight: 700;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  font-variant-numeric: tabular-nums;
}
.stats li > span { font-size: var(--fs-sm); color: var(--muted); }

/* ---------- 9. Skills dashboard ---------- */
.dash {
  border: 1px solid var(--border);
  border-radius: calc(var(--radius-lg) + 6px);
  background: linear-gradient(180deg, rgba(15, 22, 40, 0.6), rgba(10, 15, 28, 0.3));
  padding: var(--sp-3) var(--sp-3) var(--sp-3);
}
.dash-bar {
  display: flex; align-items: center; gap: var(--sp-4);
  padding: 0.4rem 0.7rem 0.9rem;
  font-family: var(--font-mono); font-size: var(--fs-xs);
  color: var(--muted);
}
.dash-bar .dots { display: flex; gap: 6px; }
.dash-bar .dots i { width: 10px; height: 10px; border-radius: 50%; background: rgba(148, 163, 255, 0.2); }
.dash-status { margin-left: auto; display: inline-flex; align-items: center; gap: 0.5rem; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
}
.skill { padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-3); border-radius: var(--radius); }
.skill:hover { transform: translateY(-4px); box-shadow: var(--shadow), var(--glow); }
.skill header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--sp-2); }
.skill-cat {
  font-family: var(--font-mono); font-size: 0.68rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted);
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.skill h3 { font-size: var(--fs-h3); }
.skill p { color: var(--text-2); font-size: 0.94rem; }
.skill .tags { margin-top: auto; padding-top: var(--sp-2); }
.skill-wide { grid-column: span 2; }

.stack-card { border-radius: var(--radius); background: rgba(6, 10, 20, 0.85); display: flex; align-items: center; }
.stack-card pre { font-size: 0.78rem; padding: var(--sp-5); }

/* ---------- 10. Projects ---------- */
.filters {
  display: flex; flex-wrap: wrap; gap: var(--sp-2);
  margin-bottom: var(--sp-6);
  padding: 0.35rem;
  width: fit-content; max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
}
.filter {
  min-height: 40px;
  padding: 0.5rem 1rem;
  font-size: var(--fs-sm);
  font-family: var(--font-display);
  color: var(--text-2);
  background: transparent;
  border: 0;
  border-radius: 10px;
  transition: color var(--t), background var(--t);
}
.filter:hover { color: var(--text); }
.filter.is-active { color: #fff; background: linear-gradient(110deg, rgba(14, 165, 233, 0.35), rgba(139, 92, 246, 0.35)); box-shadow: inset 0 0 0 1px rgba(96, 165, 250, 0.35); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-5);
}
.project { display: flex; flex-direction: column; }
.project.is-hiding { opacity: 0 !important; transform: scale(0.97) !important; }
.project[hidden] { display: none; }

/* Gradient border on hover */
.project::after, .paper::after {
  content: "";
  position: absolute; inset: 0; z-index: 2;
  padding: 1px;
  border-radius: inherit;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  opacity: 0;
  transition: opacity var(--t);
  pointer-events: none;
}
.project:hover::after, .paper:hover::after { opacity: 0.8; }
.project:hover { transform: translateY(-6px); box-shadow: var(--shadow), 0 30px 60px -30px rgba(59, 130, 246, 0.5); }

.project-art {
  position: relative;
  height: 200px;
  display: grid; place-items: center;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  background:
    linear-gradient(rgba(148, 163, 255, 0.05) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, rgba(148, 163, 255, 0.05) 1px, transparent 1px) 0 0 / 24px 24px,
    var(--art-bg, var(--bg-2));
}
.project-art svg { width: 86%; height: 78%; transition: transform var(--t-slow) var(--ease); }
.project:hover .project-art svg { transform: scale(1.05); }
.art-label, .art-foot {
  position: absolute; left: 1rem; top: 0.9rem;
  font-family: var(--font-mono); font-size: 0.66rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-2);
  padding: 0.25rem 0.55rem;
  background: rgba(5, 7, 13, 0.6);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.art-foot { top: auto; left: auto; right: 1rem; bottom: 0.9rem; }

.art-heart { --art-bg: radial-gradient(circle at 30% 50%, rgba(244, 63, 94, 0.14), transparent 60%), var(--bg-2); }
.ecg { fill: none; stroke: #fb7185; stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; filter: drop-shadow(0 0 6px rgba(251, 113, 133, 0.6)); stroke-dasharray: 700; animation: ecg 4s linear infinite; }
@keyframes ecg { from { stroke-dashoffset: 700; } to { stroke-dashoffset: -700; } }
.art-heart .bars rect { fill: rgba(96, 165, 250, 0.35); stroke: var(--sky); stroke-width: 1; transform-box: fill-box; transform-origin: bottom; animation: bar 3s ease-in-out infinite alternate; }
.art-heart .bars rect:nth-child(2) { animation-delay: -1s; }
.art-heart .bars rect:nth-child(3) { animation-delay: -2s; }
@keyframes bar { from { transform: scaleY(0.7); } }

.art-cpu { --art-bg: radial-gradient(circle at 70% 40%, rgba(34, 211, 238, 0.14), transparent 60%), var(--bg-2); }
.gantt text { font-family: var(--font-mono); font-size: 13px; fill: var(--muted); }
.gantt rect { transform-box: fill-box; transform-origin: left; animation: gantt 4s var(--ease) infinite alternate; }
.gantt .g1 { fill: rgba(34, 211, 238, 0.5); }
.gantt .g2 { fill: rgba(59, 130, 246, 0.55); animation-delay: -1.3s; }
.gantt .g3 { fill: rgba(139, 92, 246, 0.55); animation-delay: -2.6s; }
@keyframes gantt { from { transform: scaleX(0.55); } }
.art-cpu .axis { stroke: var(--border-strong); stroke-width: 1.5; }

.art-vision { --art-bg: radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.16), transparent 60%), var(--bg-2); }
.face-outline { fill: none; stroke: rgba(148, 163, 255, 0.35); stroke-width: 1.5; }
.bbox { fill: none; stroke: var(--cyan); stroke-width: 2; stroke-dasharray: 16 6; animation: dash 6s linear infinite; }
@keyframes dash { to { stroke-dashoffset: -220; } }
.landmarks circle { fill: var(--violet); }
.scanline { stroke: var(--cyan); stroke-width: 2; opacity: 0.8; filter: drop-shadow(0 0 4px var(--cyan)); animation: scan 3s ease-in-out infinite alternate; }
@keyframes scan { to { transform: translateY(100px); } }

.art-deep { --art-bg: radial-gradient(circle at 40% 60%, rgba(59, 130, 246, 0.16), transparent 60%), var(--bg-2); }
.cnn rect { fill: rgba(59, 130, 246, 0.1); stroke: var(--sky); stroke-width: 1.3; }
.cnn path { stroke: rgba(148, 163, 255, 0.5); stroke-width: 1.5; stroke-dasharray: 4 4; animation: dash 4s linear infinite; }
.out circle { fill: var(--violet); animation: node-pulse 2.4s ease-in-out infinite; }
.out circle:nth-child(2) { animation-delay: -0.8s; fill: var(--cyan); }
.out circle:nth-child(3) { animation-delay: -1.6s; }

.project-body { padding: var(--sp-5) var(--sp-5) var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-3); flex: 1; }
.project-meta {
  display: flex; justify-content: space-between; gap: var(--sp-3);
  font-family: var(--font-mono); font-size: 0.7rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted);
}
.project-meta span { color: var(--cyan); }
.project h3 { font-size: 1.4rem; }
.project-body > p:not(.project-meta) { color: var(--text-2); font-size: 0.95rem; }
.project-links { margin-top: auto; padding-top: var(--sp-3); display: flex; flex-wrap: wrap; gap: var(--sp-2); }

.projects-empty { text-align: center; color: var(--muted); padding: var(--sp-6); }
.center { display: flex; justify-content: center; margin-top: var(--sp-6); }

/* ---------- 11. Research ---------- */
.research-layout {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: var(--sp-5);
  align-items: start;
}
.research-list { display: flex; flex-direction: column; gap: var(--sp-5); }
.paper { padding: var(--sp-6); display: flex; flex-direction: column; gap: var(--sp-4); }
.paper:hover { transform: translateY(-4px); }
.paper-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--sp-3); }
.badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.3rem 0.7rem;
  font-family: var(--font-mono); font-size: 0.7rem;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--sky);
  background: rgba(96, 165, 250, 0.08);
  border: 1px solid rgba(96, 165, 250, 0.25);
  border-radius: 999px;
}
.badge-review { color: #fcd34d; background: rgba(251, 191, 36, 0.08); border-color: rgba(251, 191, 36, 0.3); }
.badge-review .live-dot { background: #fbbf24; animation-name: live-amber; }
@keyframes live-amber {
  0% { box-shadow: 0 0 0 0 rgba(251, 191, 36, 0.55); }
  100% { box-shadow: 0 0 0 10px rgba(251, 191, 36, 0); }
}
.paper-type { font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted); }
.paper h3 { font-size: clamp(1.2rem, 1.05rem + 0.5vw, 1.5rem); line-height: 1.3; }
.paper > p { color: var(--text-2); }
.paper-meta { display: flex; flex-wrap: wrap; gap: var(--sp-5); margin: 0; padding: var(--sp-3) 0; border-block: 1px dashed var(--border); }
.paper-meta div { display: flex; flex-direction: column; gap: 0.1rem; }
.paper-meta dt { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.paper-meta dd { margin: 0; font-size: var(--fs-sm); }

.research-side { display: flex; flex-direction: column; gap: var(--sp-5); position: sticky; top: calc(var(--header-h) + 20px); }
.interests { padding: var(--sp-5); }
.interests h3 { display: flex; align-items: center; gap: 0.5rem; font-size: 1.05rem; margin-bottom: var(--sp-3); }
.interests h3 .ic { color: var(--cyan); }
.interests h3.mt { margin-top: var(--sp-5); }
.interest-list li {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.4rem;
  font-size: 0.93rem; color: var(--text-2);
  border-bottom: 1px solid var(--border);
}
.interest-list li:last-child { border-bottom: 0; }
.interest-list li::before {
  content: ""; position: absolute; left: 0; top: 50%;
  width: 7px; height: 7px; margin-top: -3.5px;
  border-radius: 2px; transform: rotate(45deg);
  background: var(--grad);
}

.research-cta { padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-3); align-items: flex-start; background: linear-gradient(160deg, rgba(59, 130, 246, 0.14), rgba(139, 92, 246, 0.12) 60%, var(--surface)); }
.research-cta h3 { font-size: 1.3rem; }
.research-cta p:not(.eyebrow-sm) { color: var(--text-2); font-size: 0.93rem; }
.cta-graph { width: 140px; height: auto; margin-bottom: var(--sp-2); }
.cta-graph path { fill: none; stroke: rgba(96, 165, 250, 0.55); stroke-width: 1.4; stroke-dasharray: 300; stroke-dashoffset: 300; transition: stroke-dashoffset 2s var(--ease) 300ms; }
.no-js .cta-graph path, .research-cta.is-visible .cta-graph path { stroke-dashoffset: 0; }
.cta-graph circle { fill: var(--bg); stroke: var(--cyan); stroke-width: 1.5; }

/* ---------- 12. Education / Experience timeline ---------- */
.journey { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-7); }
.journey-col { scroll-margin-top: calc(var(--header-h) + 20px); }
.col-title { display: flex; align-items: center; gap: 0.6rem; font-size: 1.3rem; margin-bottom: var(--sp-5); }
.col-title .ic { color: var(--cyan); width: 24px; height: 24px; }

.timeline { position: relative; padding-left: 2.2rem; display: flex; flex-direction: column; gap: var(--sp-5); }
.timeline::before {
  content: ""; position: absolute; left: 0.55rem; top: 0.5rem; bottom: 0.5rem; width: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--blue), var(--violet), transparent);
  border-radius: 2px;
  transform-origin: top;
  transform: scaleY(var(--line, 1));
  transition: transform 1.4s var(--ease);
}
.js .timeline::before { --line: 0; }
.js .timeline.is-visible::before { --line: 1; }

.tl-item { position: relative; }
.tl-marker {
  position: absolute; left: -2.2rem; top: 1.5rem;
  width: 1.3rem; height: 1.3rem;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 5px rgba(34, 211, 238, 0.1), 0 0 18px rgba(34, 211, 238, 0.5);
}
.tl-marker::after { content: ""; position: absolute; inset: 3px; border-radius: 50%; background: var(--grad); }
.tl-card { padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-2); }
.tl-card:hover { transform: translateX(4px); }
.tl-date { font-family: var(--font-mono); font-size: var(--fs-xs); letter-spacing: 0.08em; text-transform: uppercase; color: var(--cyan); }
.tl-card h4 { font-size: 1.2rem; }
.tl-org { color: var(--text); font-weight: 500; font-size: 0.95rem; }
.tl-card > p:not(.tl-date):not(.tl-org) { color: var(--text-2); font-size: 0.94rem; }
.tl-card .tags { margin-top: var(--sp-2); }

.now-card { margin-top: var(--sp-5); padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-2); border-style: dashed; }
.now-card p:not(.eyebrow-sm) { color: var(--text-2); font-size: 0.95rem; }

/* ---------- 13. Contact ---------- */
.contact { overflow: hidden; text-align: center; border-top: 1px solid var(--border); background: radial-gradient(ellipse 70% 60% at 50% 0%, rgba(59, 130, 246, 0.12), transparent 70%); }
.contact-orbit {
  position: absolute; left: 50%; top: 50%;
  width: min(900px, 140vw); height: auto;
  transform: translate(-50%, -50%);
  pointer-events: none; opacity: 0.5;
}
.contact-orbit > circle { fill: none; stroke: rgba(148, 163, 255, 0.1); stroke-dasharray: 3 8; }
.contact-orbit .orbit-spin { transform-origin: 300px 300px; }

.contact-inner { position: relative; display: flex; flex-direction: column; align-items: center; gap: var(--sp-4); }
.contact .section-title { max-width: 48rem; margin-top: var(--sp-2); }
.contact .section-sub { margin-top: 0; }
.contact-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--sp-3); margin-top: var(--sp-4); }
.contact-actions .btn { white-space: normal; overflow-wrap: anywhere; }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
  width: 100%;
  max-width: 900px;
  margin-top: var(--sp-6);
  text-align: left;
}
.contact-card { display: flex; align-items: center; gap: var(--sp-4); padding: var(--sp-4) var(--sp-5); border-radius: var(--radius); }
.contact-card > .ic:first-child { width: 24px; height: 24px; color: var(--cyan); }
.contact-card span { display: flex; flex-direction: column; min-width: 0; }
.contact-card strong { font-family: var(--font-display); }
.contact-card small { font-size: 0.8rem; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.contact-card .go { margin-left: auto; color: var(--muted); transition: transform var(--t) var(--ease), color var(--t); }
.contact-card:hover { transform: translateY(-3px); box-shadow: var(--shadow), var(--glow); }
.contact-card:hover .go { color: var(--cyan); transform: translate(3px, -3px); }

.more-links { margin-top: var(--sp-5); display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: var(--sp-3); }
.more-links p { font-family: var(--font-mono); font-size: var(--fs-xs); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.more-links ul { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--sp-2); }
.more-links a {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  font-size: var(--fs-sm);
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: color var(--t), border-color var(--t);
}
.more-links a:hover { color: #fff; border-color: rgba(34, 211, 238, 0.5); }

/* ---------- 14. Footer ---------- */
.site-footer {
  position: relative;
  padding-top: var(--sp-7);
  background: rgba(5, 7, 13, 0.85);
}
.site-footer::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--blue), var(--violet), transparent);
}
.footer-inner { display: grid; grid-template-columns: 1.2fr 1.6fr auto; gap: var(--sp-6); align-items: start; }
.footer-brand p { margin-top: var(--sp-3); color: var(--muted); font-size: var(--fs-sm); }
.footer-nav ul { display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; }
.footer-nav a { font-size: var(--fs-sm); color: var(--text-2); transition: color var(--t); }
.footer-nav a:hover { color: var(--cyan); }
.site-footer .social-row { margin-top: 0; }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--sp-3);
  margin-top: var(--sp-6);
  padding-block: var(--sp-5);
  border-top: 1px solid var(--border);
  font-size: var(--fs-sm); color: var(--muted);
}

/* Back to top + toast */
.back-to-top {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 90;
  display: grid; place-items: center;
  width: 48px; height: 48px;
  border-radius: 14px;
  border: 1px solid var(--border-strong);
  background: var(--surface-strong);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  color: var(--text);
  opacity: 0; visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--t), transform var(--t) var(--ease), visibility var(--t), border-color var(--t);
}
.back-to-top.is-shown { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { border-color: var(--cyan); }
.back-to-top .ic { width: 20px; height: 20px; }

.toast {
  position: fixed; left: 50%; bottom: 1.5rem; z-index: 150;
  padding: 0.7rem 1.1rem;
  font-size: var(--fs-sm);
  background: var(--surface-strong);
  border: 1px solid rgba(52, 211, 153, 0.4);
  border-radius: 12px;
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: var(--shadow);
  transform: translate(-50%, 20px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t), transform var(--t) var(--ease);
}
.toast.is-shown { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 15. Responsive ---------- */
@media (max-width: 1180px) {
  .nav-links a { padding-inline: 0.5rem; font-size: 0.86rem; }
  .nav-links a::after { left: 0.5rem; right: 0.5rem; }
  .brand-text small { display: none; }
}

@media (max-width: 1024px) {
  /* Mobile/tablet navigation */
  .nav-toggle { display: block; z-index: 2; }
  .nav-menu {
    position: fixed; inset: var(--header-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: var(--sp-4);
    padding: var(--sp-5) 1.25rem var(--sp-6);
    background: rgba(5, 7, 13, 0.96);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border-bottom: 1px solid var(--border);
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    opacity: 0; visibility: hidden;
    transform: translateY(-12px);
    transition: opacity var(--t), transform var(--t) var(--ease), visibility var(--t);
  }
  .nav-menu.is-open { opacity: 1; visibility: visible; transform: none; }
  .site-header:has(.nav-menu.is-open) { background: rgba(5, 7, 13, 0.96); }
  .nav-links { flex-direction: column; gap: 0; }
  .nav-links a { padding: 0.85rem 0.25rem; font-size: 1.05rem; border-bottom: 1px solid var(--border); border-radius: 0; }
  .nav-links a::after { left: 0.25rem; right: auto; width: 40px; bottom: -1px; }
  .nav-cv { align-self: flex-start; }

  .hero { grid-template-columns: 1fr; text-align: center; gap: var(--sp-8); padding-bottom: calc(var(--sp-9) + 2rem); }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .hero-lead { margin-inline: auto; }
  .hero-actions, .social-row { justify-content: center; }
  .hero-visual { width: min(80%, 420px); order: -1; }
  .code-card { left: -12%; bottom: -8%; width: 250px; }

  .about-grid, .research-layout { grid-template-columns: 1fr; }
  .research-side { position: static; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .stack-card { grid-column: span 2; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-nav { grid-column: span 2; grid-row: 2; }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; }
  .container { width: min(100% - 2rem, var(--container)); }
  .projects-grid { grid-template-columns: 1fr; }
  .journey { grid-template-columns: 1fr; gap: var(--sp-7); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats li:nth-child(3) { border-left: 0; }
  .stats li:nth-child(n + 3) { border-top: 1px solid var(--border); }
  .chip-2 { right: -4%; }
  .chip-3 { right: -2%; }
}

@media (max-width: 640px) {
  .skills-grid { grid-template-columns: 1fr; }
  .skill-wide, .stack-card { grid-column: auto; }
  .contact-grid { grid-template-columns: 1fr; }
  .code-card { display: none; }
  .hero-visual { width: min(84%, 340px); }
  .float-chip { font-size: 0.68rem; padding: 0.4rem 0.65rem; }
  .chip-1 { left: -6%; }
  .about-bio, .paper { padding: var(--sp-5); }
  .facts div { grid-template-columns: 1fr; gap: 0.15rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-nav { grid-column: auto; grid-row: auto; }
  .hero-actions .btn { flex: 1 1 100%; }
  .filters { width: 100%; }
  .filter { flex: 1 1 auto; }
  .dash { padding: var(--sp-2); }
}

@media (max-width: 380px) {
  .container { width: calc(100% - 1.5rem); }
  .brand-text strong { font-size: 0.92rem; }
  .chip-3 { display: none; }
  .stats li { padding: var(--sp-4); }
  .ticker li { padding: 0.9rem 1.4rem; font-size: 0.95rem; }
  .hero-role { font-size: 0.95rem; }
}

/* Large screens */
@media (min-width: 1600px) {
  :root { --container: 1320px; }
}

/* ---------- 16. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .split .w > span { transform: none; }
  .js .timeline::before { --line: 1; }
  .js .divider .draw { stroke-dashoffset: 0; }
  .ticker-track { animation: none; }
  .pulse { display: none; }
  .ecg { stroke-dasharray: none; }
  .caret { display: none; }
  .cursor-glow { display: none; }
}