/* =========================================================
   CHEN YANGUANG — PORTFOLIO
   Stack: HTML / CSS / vanilla JS + GSAP (ScrollTrigger)
   ========================================================= */

/* ---------- Reset & root ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}
body {
  font-family: 'Outfit', system-ui, sans-serif;
  font-feature-settings: 'ss01', 'ss02';
  color: var(--fg);
  background: var(--bg);
  line-height: 1.55;
  overflow-x: hidden;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  cursor: none;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: none; }
ul { list-style: none; padding: 0; margin: 0; }
.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;
}

/* ---------- Theme tokens ---------- */
:root {
  --bg:           #07070d;
  --bg-soft:      #0d0d18;
  --bg-card:      rgba(20, 20, 35, 0.55);
  --fg:           #ecedf3;
  --fg-dim:       #bfc1cf;
  --fg-mute:      #9ea0af;
  --line:         rgba(255, 255, 255, 0.08);
  --line-strong:  rgba(255, 255, 255, 0.16);

  --accent:       #7c5cff;     /* electric purple */
  --accent-2:     #00d2ff;     /* cyan */
  --accent-3:     #ff6ec7;     /* magenta */
  --accent-4:     #c8ff00;     /* acid lime */

  --grad-1: linear-gradient(135deg, #7c5cff 0%, #00d2ff 100%);
  --grad-2: linear-gradient(135deg, #ff6ec7 0%, #7c5cff 100%);
  --grad-3: linear-gradient(135deg, #c8ff00 0%, #00d2ff 100%);

  --radius:       18px;
  --radius-sm:    10px;
  --max:          1280px;
  --pad:          clamp(1.25rem, 4vw, 3rem);
  /* Locked nav height — drives the mobile menu overlay's top offset. JS keeps it in sync at runtime. */
  --nav-h:        4.25rem;

  /* One aspect ratio for every image tile (experience, projects, edu, certs, about portrait) */
  --media-aspect-ratio: 16 / 10;
  /* Fixed tile width inside .media-strip — avoids 1fr stretching so 2-frame strips
     don't render larger than 3-frame strips. Wraps via auto-fit on narrow viewports. */
  --media-tile-width: 240px;
  /* Certifications: fixed card column width (+ logo tile); avoids 1fr stretching when column count changes.
     Sized so 4 columns fit at the 1280px container width (4 × 15rem + 3 × 1.2rem gap = 63.6rem ≈ 1018px). */
  --cert-card-width: 15rem;
  --cert-media-size: 7rem;
  /* Uniform text area so long course names don’t make some cards shorter/taller */
  --cert-body-min-height: 11rem;
  --cert-card-min-height: calc(
    var(--cert-media-size) + 0.9rem + var(--cert-body-min-height) + 2 * 1.1rem
  );

  --t-fast:       0.18s cubic-bezier(.2,.8,.2,1);
  --t-med:        0.4s  cubic-bezier(.2,.8,.2,1);
  --t-slow:       0.8s  cubic-bezier(.2,.8,.2,1);
}

[data-theme='light'] {
  --bg:           #f7f7fa;
  --bg-soft:      #eef0f7;
  --bg-card:      rgba(255, 255, 255, 0.7);
  --fg:           #0e0f1a;
  --fg-dim:       #343544;
  --fg-mute:      #5e6070;
  --line:         rgba(10, 10, 30, 0.1);
  --line-strong:  rgba(10, 10, 30, 0.22);

  --accent:       #5f3bdb;
  --accent-2:     #006f9f;
  --accent-3:     #b32477;
  --accent-4:     #4f6f00;
}

/* =========================================================
   Animated background — layered, fixed, behind all content
   z-index stack (back → front):
     -5  bg-mesh         (slow rotating conic gradient halo)
     -4  bg-aurora       (diagonal sweeping aurora streak)
     -3  bg-blobs        (4 floating color blobs)
     -2  grid-overlay    (drifting grid lines)
     -1  bg-scanlines    (subtle horizontal sheen)
   ========================================================= */

/* ---------- Conic mesh halo (slow rotation, very subtle) ---------- */
.bg-mesh {
  position: fixed; inset: -20vmax;
  z-index: -5;
  pointer-events: none;
  background:
    conic-gradient(from 0deg at 50% 50%,
      rgba(124, 92, 255, 0.18) 0deg,
      rgba(0, 0, 0, 0)         60deg,
      rgba(0, 210, 255, 0.16)  140deg,
      rgba(0, 0, 0, 0)         200deg,
      rgba(255, 110, 199, 0.14) 280deg,
      rgba(0, 0, 0, 0)         340deg,
      rgba(124, 92, 255, 0.18) 360deg);
  filter: blur(60px);
  opacity: 0.7;
  animation: meshSpin 45s linear infinite;
  will-change: transform;
}
@keyframes meshSpin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
[data-theme='light'] .bg-mesh { opacity: 0.45; mix-blend-mode: multiply; }

/* ---------- Aurora streak (diagonal sweep) ---------- */
.bg-aurora {
  position: fixed; inset: -10vmax;
  z-index: -4;
  pointer-events: none;
  background:
    linear-gradient(115deg,
      transparent 30%,
      rgba(124, 92, 255, 0.18) 45%,
      rgba(0, 210, 255, 0.22)  50%,
      rgba(255, 110, 199, 0.16) 55%,
      transparent 70%);
  filter: blur(80px);
  opacity: 0.85;
  mix-blend-mode: screen;
  background-size: 200% 200%;
  animation: auroraSweep 18s ease-in-out infinite;
  will-change: background-position, transform;
  --mx: 0px;
  --my: 0px;
}
@keyframes auroraSweep {
  0%   { background-position:   0%   0%; transform: translate(calc(var(--mx) - 4vw), calc(var(--my) - 2vh)); }
  50%  { background-position: 100% 100%; transform: translate(calc(var(--mx) + 4vw), calc(var(--my) + 2vh)); }
  100% { background-position:   0%   0%; transform: translate(calc(var(--mx) - 4vw), calc(var(--my) - 2vh)); }
}
[data-theme='light'] .bg-aurora { opacity: 0.55; mix-blend-mode: multiply; }

/* ---------- Floating blobs ---------- */
.bg-blobs {
  position: fixed; inset: 0;
  z-index: -3;
  overflow: hidden;
  pointer-events: none;
}
.blob {
  position: absolute;
  width: 60vmax; height: 60vmax;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.55;
  mix-blend-mode: screen;
  will-change: transform;
  /* CSS variable that JS updates with mouse position for parallax */
  --mx: 0px;
  --my: 0px;
}
.blob-1 { background: radial-gradient(circle at 30% 30%, #7c5cff, transparent 60%); top: -20%; left: -15%; animation: blobFloat1 22s ease-in-out infinite; }
.blob-2 { background: radial-gradient(circle at 70% 30%, #00d2ff, transparent 60%); bottom: -25%; right: -20%; animation: blobFloat2 26s ease-in-out infinite; }
.blob-3 { background: radial-gradient(circle at 50% 50%, #ff6ec7, transparent 60%); top: 40%; left: 40%; opacity: 0.35; animation: blobFloat3 30s ease-in-out infinite; }
.blob-4 { background: radial-gradient(circle at 50% 50%, #c8ff00, transparent 60%); top: -10%; right: 30%; width: 35vmax; height: 35vmax; opacity: 0.18; filter: blur(100px); animation: blobFloat4 16s ease-in-out infinite; }

[data-theme='light'] .blob { opacity: 0.32; mix-blend-mode: multiply; filter: blur(140px); }
[data-theme='light'] .blob-4 { opacity: 0.18; }

@keyframes blobFloat1 {
  0%, 100% { transform: translate(calc(var(--mx) * 1.0),  calc(var(--my) * 1.0))                  scale(1);    }
  50%      { transform: translate(calc(var(--mx) * 1.0 + 8vw),  calc(var(--my) * 1.0 + 6vh))      scale(1.1);  }
}
@keyframes blobFloat2 {
  0%, 100% { transform: translate(calc(var(--mx) * -0.7), calc(var(--my) * -0.7))                 scale(1);    }
  50%      { transform: translate(calc(var(--mx) * -0.7 - 6vw), calc(var(--my) * -0.7 - 8vh))     scale(1.15); }
}
@keyframes blobFloat3 {
  0%, 100% { transform: translate(calc(var(--mx) * 0.5),  calc(var(--my) * 0.5))                  scale(1);    }
  50%      { transform: translate(calc(var(--mx) * 0.5 - 10vw), calc(var(--my) * 0.5 + 10vh))     scale(0.9);  }
}
@keyframes blobFloat4 {
  0%, 100% { transform: translate(calc(var(--mx) * -0.4), calc(var(--my) * -0.4))                 scale(1);    }
  50%      { transform: translate(calc(var(--mx) * -0.4 + 12vw), calc(var(--my) * -0.4 - 6vh))    scale(1.25); }
}

/* ---------- Animated grid (drift + breathing opacity) ---------- */
.grid-overlay {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  opacity: 0.45;
  animation: gridDrift 60s linear infinite, gridBreathe 8s ease-in-out infinite;
  will-change: background-position, opacity;
}
@keyframes gridDrift {
  from { background-position: 0 0,           0 0; }
  to   { background-position: 64px 64px,     64px 64px; }
}
@keyframes gridBreathe {
  0%, 100% { opacity: 0.35; }
  50%      { opacity: 0.6;  }
}

/* ---------- Subtle scanline sheen (very faint, performant) ---------- */
.bg-scanlines {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    repeating-linear-gradient(
      to bottom,
      rgba(255, 255, 255, 0.012) 0,
      rgba(255, 255, 255, 0.012) 1px,
      transparent 1px,
      transparent 3px);
  mix-blend-mode: overlay;
  opacity: 0.6;
  animation: scanlineDrift 14s linear infinite;
}
@keyframes scanlineDrift {
  from { background-position: 0 0; }
  to   { background-position: 0 90px; }
}
[data-theme='light'] .bg-scanlines { display: none; }

/* ---------- Reduced motion: kill heavy animations ---------- */
@media (prefers-reduced-motion: reduce) {
  .bg-mesh, .bg-aurora, .bg-scanlines,
  .grid-overlay, .blob {
    animation: none !important;
  }
}

.performance-lite .cursor {
  display: none;
}
.performance-lite .bg-mesh,
.performance-lite .bg-aurora,
.performance-lite .grid-overlay,
.performance-lite .bg-scanlines,
.performance-lite .blob {
  animation: none !important;
  will-change: auto;
}
.performance-lite .bg-mesh { opacity: 0.42; filter: blur(42px); }
.performance-lite .bg-aurora { opacity: 0.45; filter: blur(52px); transform: none; }
.performance-lite .bg-scanlines { display: none; }
.performance-lite .blob { opacity: 0.28; filter: blur(80px); transform: none; }
.performance-lite .blob-3,
.performance-lite .blob-4 { display: none; }

@media (max-width: 900px), (hover: none), (pointer: coarse), (prefers-reduced-motion: reduce) {
  .cursor { display: none; }
  .bg-mesh, .bg-aurora, .grid-overlay, .bg-scanlines, .blob {
    animation: none !important;
    will-change: auto;
  }
  .bg-mesh { opacity: 0.42; filter: blur(42px); }
  .bg-aurora { opacity: 0.45; filter: blur(52px); transform: none; }
  .bg-scanlines { display: none; }
  .blob { opacity: 0.28; filter: blur(80px); transform: none; }
  .blob-3, .blob-4 { display: none; }
}

/* ---------- Custom cursor ---------- */
.cursor {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
}
.cursor-dot {
  width: 6px; height: 6px; background: #fff; border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width var(--t-fast), height var(--t-fast), background var(--t-fast);
}
.cursor-ring {
  position: absolute; top: 0; left: 0;
  width: 38px; height: 38px;
  border: 1.5px solid rgba(255,255,255,0.6);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width var(--t-med), height var(--t-med), border-color var(--t-med), opacity var(--t-fast);
}
.cursor.is-hover .cursor-ring { width: 64px; height: 64px; border-color: var(--accent-2); }
.cursor.is-hover .cursor-dot  { width: 0; height: 0; }
.cursor.is-down .cursor-ring  { width: 28px; height: 28px; }
@media (max-width: 900px), (hover: none) {
  body { cursor: auto; }
  button, a { cursor: pointer; }
  .cursor { display: none; }
}

/* ---------- Scroll progress bar ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0;
  height: 2px; width: 0%;
  background: var(--grad-1);
  z-index: 100;
  transition: width 0.05s linear;
  box-shadow: 0 0 10px var(--accent);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.75rem;
  min-height: var(--nav-h);
  padding: 0 var(--pad);
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-med);
  isolation: isolate;
}
/* Backdrop blur + gradient lives on a pseudo so .nav itself does NOT become a
   containing block for the fixed mobile menu overlay (.nav-links). Without this,
   `backdrop-filter` on .nav would constrain .nav-links to the navbar's height. */
.nav::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  background: linear-gradient(to bottom, rgba(7,7,13,0.55), rgba(7,7,13,0.0));
  transition: background var(--t-med);
}
.nav.scrolled::before { background: rgba(7, 7, 13, 0.7); }
.nav.scrolled { border-bottom-color: var(--line); }
[data-theme='light'] .nav::before { background: linear-gradient(to bottom, rgba(247,247,250,0.75), rgba(247,247,250,0)); }
[data-theme='light'] .nav.scrolled::before { background: rgba(247,247,250,0.85); }

.nav-logo {
  position: relative;
  z-index: 3;
  display: flex; align-items: center; gap: 0.6rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600; letter-spacing: 0.08em;
  font-size: 0.9rem;
}
.logo-mark {
  display: block;
  width: 38px; height: 38px;
  border-radius: 9px;
  object-fit: cover;
  background: #07070d;
  border: 1px solid var(--line-strong);
  box-shadow:
    0 0 0 1px rgba(124, 92, 255, 0.18),
    0 8px 22px -10px rgba(124, 92, 255, 0.55);
  transition: transform var(--t-fast), box-shadow var(--t-fast), border-color var(--t-fast);
}
.nav-logo:hover .logo-mark {
  transform: rotate(-4deg) scale(1.04);
  border-color: var(--accent-2);
  box-shadow:
    0 0 0 1px rgba(0, 210, 255, 0.35),
    0 12px 28px -10px rgba(0, 210, 255, 0.6);
}
.logo-pulse {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-4);
  box-shadow: 0 0 0 0 var(--accent-4);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(200,255,0,0.7); }
  70%  { box-shadow: 0 0 0 12px rgba(200,255,0,0); }
  100% { box-shadow: 0 0 0 0 rgba(200,255,0,0); }
}

.nav-links {
  display: flex; gap: 2.2rem;
  font-size: 0.92rem;
}
.nav-links a {
  position: relative; color: var(--fg-dim);
  transition: color var(--t-fast);
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -4px;
  width: 0; height: 1.5px;
  background: var(--accent-2);
  transition: width var(--t-med);
}
.nav-links a:hover { color: var(--fg); }
.nav-links a:hover::after { width: 100%; }
@media (min-width: 901px) and (max-width: 1180px) {
  .nav-links {
    gap: 1.15rem;
    font-size: 0.84rem;
  }
}

.nav-actions {
  position: relative;
  z-index: 3;
  display: flex; align-items: center; gap: 0.5rem;
}
.theme-toggle {
  --switch-color: #ff3b3b;
  --switch-depth: 8px;
  --switch-angle: 22deg;
  width: 34px;
  height: 44px;
  padding: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 5px;
  background: #050508;
  box-shadow:
    0 0 8px 1px rgba(0, 0, 0, 0.25),
    0 0 1px 1px #000,
    inset 0 1px 1px -1px rgba(255, 255, 255, 0.9),
    inset 0 0 1px 6px #47434c,
    inset 0 0 1px 9px #000;
  perspective: 360px;
  overflow: visible;
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 4px;
}
.theme-toggle .switch-button {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
  overflow: hidden;
  transform-origin: center center calc(-1 * var(--switch-depth));
  transform: translateZ(var(--switch-depth)) rotateX(calc(-1 * var(--switch-angle)));
  transform-style: preserve-3d;
  background:
    linear-gradient(
      #711126 0%,
      #570819 30%,
      #570819 70%,
      #711126 100%
    );
  transition: transform var(--t-med), box-shadow var(--t-med);
}
.theme-toggle .switch-button::before,
.theme-toggle .switch-button::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 12px;
  background-repeat: no-repeat;
}
.theme-toggle .switch-button::before {
  top: 0;
  transform-origin: top;
  transform: rotateX(-90deg);
  background:
    linear-gradient(rgba(255, 255, 255, 0.75) 10%, rgba(255, 255, 255, 0.25) 30%, #3d0410 75%, #260208) 50% 50% / 97% 97%,
    #8a1830;
}
.theme-toggle .switch-button::after {
  bottom: 0;
  transform-origin: top;
  transform: translateY(12px) rotateX(-90deg);
  background: linear-gradient(#3d0410, #260208);
  box-shadow: 0 12px 4px 0 #000, 0 24px 10px 0 rgba(0, 0, 0, 0.5);
}
.theme-toggle .light,
.theme-toggle .dots,
.theme-toggle .characters,
.theme-toggle .shine,
.theme-toggle .shadow {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.theme-toggle .light {
  opacity: 0;
  background: radial-gradient(#ffbe5c, var(--switch-color) 40%, transparent 70%);
  animation: light-off 1s;
}
.theme-toggle .dots {
  background-image: radial-gradient(transparent 30%, rgba(61, 4, 16, 0.72) 70%);
  background-size: 6px 6px;
}
.theme-toggle .characters {
  background:
    linear-gradient(#fff, #fff) 50% 20% / 5% 20%,
    radial-gradient(circle, transparent 50%, #fff 52%, #fff 70%, transparent 72%) 50% 80% / 33% 25%;
  background-repeat: no-repeat;
}
.theme-toggle .shine {
  opacity: 0.3;
  background:
    linear-gradient(#fff, transparent 3%) 50% 50% / 97% 97%,
    linear-gradient(rgba(255, 255, 255, 0.5), transparent 50%, transparent 80%, rgba(255, 255, 255, 0.5)) 50% 50% / 97% 97%;
  background-repeat: no-repeat;
  transition: opacity var(--t-med);
}
.theme-toggle .shadow {
  opacity: 1;
  background: linear-gradient(transparent 70%, rgba(0, 0, 0, 0.8));
  transition: opacity var(--t-med);
}
.theme-toggle:hover .switch-button {
  box-shadow: 0 0 16px rgba(255, 59, 59, 0.35);
}
[data-theme='light'] .theme-toggle .switch-button {
  transform: translateZ(var(--switch-depth)) rotateX(var(--switch-angle));
  box-shadow: 0 -8px 18px rgba(255, 59, 59, 0.9);
}
[data-theme='light'] .theme-toggle .light {
  opacity: 1;
  animation: flicker 0.2s infinite 0.3s;
}
[data-theme='light'] .theme-toggle .shine {
  opacity: 1;
}
[data-theme='light'] .theme-toggle .shadow {
  opacity: 0;
}
@keyframes flicker {
  0% { opacity: 1; }
  80% { opacity: 0.82; }
  100% { opacity: 1; }
}
@keyframes light-off {
  0% { opacity: 1; }
  80% { opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .theme-toggle .light {
    animation: none !important;
  }
}

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px; height: 40px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  align-items: center;
  position: relative;
  z-index: 4; /* sit above the .nav-links overlay so it can close the menu */
  transition: border-color var(--t-fast);
}
.nav-burger:hover { border-color: var(--accent-2); }
.nav-burger span {
  width: 18px; height: 2px;
  background: var(--fg);
  display: block;
  border-radius: 2px;
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.nav-burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  body.menu-open .nav {
    bottom: 0;
    min-height: 100dvh;
    align-items: flex-start;
    padding-top: max(0px, calc((var(--nav-h) - 40px) / 2));
  }
  body.menu-open .nav::before {
    bottom: auto;
    height: var(--nav-h);
  }
  .nav-links {
    position: fixed; inset: var(--nav-h) 0 0 0;
    flex-direction: column; align-items: center; justify-content: center;
    gap: 1.6rem;
    padding: clamp(1.5rem, 6vw, 3rem);
    background:
      linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0.025)),
      radial-gradient(circle at 20% 15%, rgba(124,92,255,0.24), transparent 34%),
      radial-gradient(circle at 80% 78%, rgba(0,210,255,0.18), transparent 36%),
      rgba(7,7,13,0.72);
    -webkit-backdrop-filter: blur(28px) saturate(170%);
    backdrop-filter: blur(28px) saturate(170%);
    border-top: 1px solid rgba(255,255,255,0.12);
    box-shadow:
      inset 0 1px 0 rgba(255,255,255,0.08),
      0 24px 70px rgba(0,0,0,0.38);
    /* Element is `100vh - var(--nav-h)` tall, so a plain `-100%` translate stops
       short by var(--nav-h) and leaves the bottom strip visible. Using calc to
       move it the FULL viewport height plus a small buffer guarantees it clears. */
    transform: translateY(calc(-100% - var(--nav-h) - 1rem));
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--t-med), visibility 0s linear var(--t-med);
    overscroll-behavior: contain;
    overflow-y: auto;
    /* sit below .nav header but above page content; nav itself has z-index: 50 */
    z-index: 1;
  }
  [data-theme='light'] .nav-links {
    background:
      linear-gradient(135deg, rgba(255,255,255,0.82), rgba(255,255,255,0.54)),
      radial-gradient(circle at 20% 15%, rgba(124,92,255,0.16), transparent 34%),
      radial-gradient(circle at 80% 78%, rgba(0,210,255,0.14), transparent 36%),
      rgba(247,247,250,0.72);
    border-top-color: rgba(10,10,30,0.1);
    box-shadow:
      inset 0 1px 0 rgba(255,255,255,0.72),
      0 24px 70px rgba(10,10,30,0.12);
  }
  .nav-links.open {
    transform: translateY(0);
    visibility: visible;
    pointer-events: auto;
    transition: transform var(--t-med), visibility 0s linear 0s;
  }
  .nav-links a {
    min-width: min(22rem, 100%);
    padding: 0.9rem 1.25rem;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 14px;
    background: rgba(255,255,255,0.055);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
    font-size: 1.2rem;
    color: var(--fg);
    text-align: center;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
  }
  .nav-links a:hover,
  .nav-links a.active {
    border-color: rgba(0,210,255,0.5);
    background: rgba(0,210,255,0.1);
    color: var(--accent-2);
  }
  .nav-links a::after { display: none; }
  [data-theme='light'] .nav-links a {
    color: var(--fg);
    border-color: rgba(10,10,30,0.1);
    background: rgba(255,255,255,0.58);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.72);
  }
  .nav-burger { display: inline-flex; }
}

/* Lock body scroll while the mobile menu is open without disabling taps. */
body.menu-open { overflow: hidden; }

/* ---------- Buttons ---------- */
.btn {
  position: relative;
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.85rem 1.4rem;
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: transform var(--t-fast), background var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; transition: transform var(--t-fast); }
.btn:hover svg { transform: translateX(3px); }

.btn-primary {
  background: var(--grad-1);
  color: #fff;
  box-shadow: 0 12px 30px -10px rgba(124, 92, 255, 0.6);
}
.btn-primary:hover { box-shadow: 0 16px 40px -10px rgba(124, 92, 255, 0.85); }

.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--fg);
}
.btn-ghost:hover { border-color: var(--accent-2); color: var(--accent-2); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  padding: calc(7rem + var(--pad)) var(--pad) var(--pad);
  display: flex; flex-direction: column; justify-content: center;
  max-width: var(--max); margin: 0 auto;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding-bottom: 8rem;
}

.hero-main {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.95fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
}

.hero-copy {
  min-width: 0;
}

/* Procedural hero showcase: canvas artwork, synchronized phrase and act controls. */
.hero-animation {
  position: relative;
  z-index: 2;
  width: min(100%, 500px);
  margin-left: auto;
  display: grid;
  justify-items: center;
  pointer-events: none;
}
.hero-animation-stage {
  position: relative;
  width: 100%;
  height: clamp(280px, 31vw, 380px);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: calc(var(--radius) + 8px);
  background:
    radial-gradient(circle at 20% 0%, rgba(124, 92, 255, 0.14), transparent 42%),
    rgba(13, 13, 24, 0.72);
  box-shadow: 0 28px 80px -42px rgba(0, 0, 0, 0.9);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  pointer-events: auto;
}
[data-theme='light'] .hero-animation-stage {
  background:
    radial-gradient(circle at 20% 0%, rgba(95, 59, 219, 0.11), transparent 42%),
    rgba(255, 255, 255, 0.74);
  box-shadow: 0 28px 80px -42px rgba(41, 38, 69, 0.35);
}
.hero-animation-stage canvas {
  display: block;
  width: 100%;
  height: 100%;
}
.hero-animation-hint {
  position: absolute;
  right: 1rem;
  bottom: 0.8rem;
  color: var(--fg-mute);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity var(--t-fast);
}
.hero-animation-stage:hover .hero-animation-hint { opacity: 0.8; }
.hero-animation-phrase {
  margin-top: 0.75rem;
  padding: 0.55rem 1.1rem 0.65rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--fg-dim);
  font-size: clamp(0.95rem, 1.6vw, 1.2rem);
  line-height: 1;
  box-shadow: 0 10px 30px -20px rgba(0, 0, 0, 0.8);
}
.hero-animation-phrase.is-changing { animation: heroPhraseIn 0.45s cubic-bezier(.2,.8,.2,1); }
.hero-animation-phrase span:first-child {
  color: var(--fg);
  font-weight: 650;
}
@keyframes heroPhraseIn {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.hero-animation-dots {
  display: flex;
  gap: 0.55rem;
  margin-top: 1rem;
  pointer-events: auto;
}
.hero-animation-dot {
  width: 8px;
  height: 8px;
  border: 0;
  border-radius: 999px;
  background: var(--fg-mute);
  opacity: 0.38;
  cursor: none;
  transition: width var(--t-fast), opacity var(--t-fast), background var(--t-fast);
}
.hero-animation-dot:hover { opacity: 0.8; }
.hero-animation-dot.is-active {
  width: 28px;
  background: var(--accent-2);
  opacity: 1;
}
.hero-animation-caption {
  margin-top: 0.7rem;
  color: var(--fg-mute);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

@media (min-width: 1101px) {
  .hero-title { font-size: clamp(2.8rem, 5.7vw, 5.5rem); }
}

@media (max-width: 1100px) {
  .hero-animation {
    width: min(100%, 680px);
    margin: 2.5rem auto 0;
  }
  .hero-animation-stage { height: clamp(280px, 52vw, 390px); }
  .hero-main { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .hero-animation { margin: 2rem auto 0; }
  .hero-animation-stage {
    height: clamp(240px, 70vw, 320px);
    border-radius: var(--radius);
  }
  .hero-animation-hint { display: none; }
  .hero-animation-caption { font-size: 0.58rem; }
}

.hero-tag {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.82rem; color: var(--fg-dim);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 1.8rem;
  backdrop-filter: blur(10px);
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-4); box-shadow: 0 0 12px var(--accent-4); }

.hero-title {
  font-size: clamp(2.5rem, 7.5vw, 6.5rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin-bottom: 1.5rem;
}
.hero-title .line { display: block; overflow: hidden; }
.hero-title .line > span { display: inline-block; will-change: transform; }
.hero-title i {
  font-style: normal;
  color: var(--accent-2);
  display: inline-block;
  animation: blink 1.1s steps(1) infinite;
}
/* Shared accent text style — italic gradient serif for hero word(s) */
.hero-title em.accent,
.hero-title .messy-rotator .word {
  font-style: italic;
  font-family: 'Instrument Serif', serif;
  font-weight: 400;
  background: var(--grad-2);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  padding-right: 0.05em;
}

/* ---------- Animated word rotator (hero "messy" → broken → manual → ...) ---------- */
.messy-rotator {
  display: inline-grid;
  grid-template-areas: "stack";
  align-items: baseline;
  vertical-align: baseline;
  perspective: 800px;
  font-style: normal; /* italic comes from .word so empty grid doesn't slant */
}
.messy-rotator .word {
  grid-area: stack;
  white-space: nowrap;
  text-align: left;
  opacity: 0;
  transform: translateY(0.45em) rotateX(60deg);
  transform-origin: 50% 100%;
  filter: blur(6px);
  animation: messy-rotate 12s cubic-bezier(.7, 0, .25, 1) infinite;
  will-change: transform, opacity, filter;
}
.messy-rotator .word:nth-child(1) { animation-delay: -0.6s; }
.messy-rotator .word:nth-child(2) { animation-delay:  1.8s; }
.messy-rotator .word:nth-child(3) { animation-delay:  4.2s; }
.messy-rotator .word:nth-child(4) { animation-delay:  6.6s; }
.messy-rotator .word:nth-child(5) { animation-delay:  9.0s; }

@keyframes messy-rotate {
  0%, 100% { opacity: 0; transform: translateY(0.45em) rotateX(60deg);  filter: blur(6px); }
  3%       { opacity: 1; transform: translateY(0)      rotateX(0);      filter: blur(0); }
  17%      { opacity: 1; transform: translateY(0)      rotateX(0);      filter: blur(0); }
  20%      { opacity: 0; transform: translateY(-0.45em) rotateX(-60deg); filter: blur(6px); }
}

@media (prefers-reduced-motion: reduce) {
  .messy-rotator .word { animation: none; }
  .messy-rotator .word:nth-child(1) { opacity: 1; transform: none; filter: none; }
  .messy-rotator .word:not(:nth-child(1)) { display: none; }
}

@keyframes blink { 50% { opacity: 0; } }

.hero-sub {
  max-width: 640px;
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  color: var(--fg-dim);
  margin-bottom: 2.4rem;
}

.hero-cta { display: flex; gap: 0.8rem; flex-wrap: wrap; margin-bottom: 4rem; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  width: 100%;
  margin: 3rem auto 0;
  border-top: 1px solid var(--line);
  padding-top: 2rem;
}
.stat {
  border-left: 1px solid var(--line);
  padding-left: 1rem;
}
.stat:first-child { border-left: 0; padding-left: 0; }
.stat-num {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1;
  margin-bottom: 0.5rem;
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-suffix {
  font-family: 'Instrument Serif', serif;
  font-size: 0.7em;
  margin-left: 0.05em;
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 0.82rem; color: var(--fg-dim); line-height: 1.4; }

@media (max-width: 720px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .stat { border-left: 0; padding-left: 0; }
}

.hero-scroll {
  position: absolute;
  /* sits above the full-bleed marquee (~50px tall) on >720px, otherwise hugs the bottom */
  bottom: 0.25rem; left: 50%; transform: translateX(-50%);
  z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--fg-mute);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
@media (max-width: 720px) {
  /* Push the scroll cue further from the hero stats/CTA on mobile so it never
     visually collides with them. Padding on .hero adds breathing room above; the
     larger bottom + margin-top floats the indicator clearly below the content. */
  .hero { padding-bottom: 3rem; }
  .hero-inner { padding-bottom: 9rem; }
  .hero-stats { margin-bottom: 2rem; }
  .hero-scroll {
    bottom: 0.5rem;
  }
}
.scroll-line {
  width: 1px; height: 50px;
  background: linear-gradient(to bottom, var(--fg-mute), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-line::after {
  content: '';
  position: absolute;
  top: -50%; left: 0;
  width: 100%; height: 50%;
  background: linear-gradient(to bottom, transparent, var(--accent-2));
  animation: scrollDown 2s ease-in-out infinite;
}
@keyframes scrollDown {
  0%   { top: -50%; }
  100% { top: 100%; }
}

/* ---------- Marquee ---------- */
.hero-marquee {
  position: absolute;
  bottom: 0;
  /* Full-bleed across the viewport, breaking out of .hero's max-width */
  left: 50%;
  right: auto;
  width: 100vw;
  transform: translateX(-50%);
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 0.9rem 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  color: var(--fg-dim);
  background: rgba(7,7,13,0.4);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  display: none; /* shown >720px */
}
[data-theme='light'] .hero-marquee { background: rgba(247,247,250,0.55); }
@media (min-width: 720px) {
  .hero-marquee { display: block; bottom: -1px; }
  .hero { padding-bottom: 7.5rem; }
}
.marquee-track {
  display: flex;
  width: max-content;
  white-space: nowrap;
  animation: marquee 38s linear infinite;
}
.marquee-group {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  /* Each duplicated group fills at least one viewport so the strip never reveals empty
     background behind the items on wide screens. */
  min-width: 100vw;
  box-sizing: border-box;
  padding-right: 1.4rem;
}
.marquee-group > span {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  color: var(--fg);
  font-weight: 500;
}
.marquee-group > span::after {
  content: '·';
  color: var(--fg-mute);
  font-weight: 400;
  margin-inline: 1.4rem;
}
@keyframes marquee {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ---------- Generic section ---------- */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 8rem var(--pad);
  position: relative;
  content-visibility: auto;
  contain-intrinsic-size: 1000px;
}
@media (max-width: 720px) {
  .section.about { padding-top: 3.5rem; }
}
.section-header {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: end;
  gap: 1.4rem;
  margin-bottom: 3.5rem;
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--line);
}
.section-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent-2);
  letter-spacing: 0.18em;
}
.section-title {
  grid-column: 1 / -1;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1;
}
.section-sub {
  grid-column: 1 / -1;
  color: var(--fg-dim);
  max-width: 700px;
  font-size: 1.05rem;
}
@media (min-width: 720px) {
  .section-header { grid-template-columns: 80px 1fr; }
  .section-num { grid-column: 1; align-self: start; padding-top: 0.8rem; }
  .section-title { grid-column: 2; }
  .section-sub { grid-column: 2; }
}

/* ---------- Glass utility ---------- */
.glass {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}

/* ---------- Media frame ---------- */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: var(--media-aspect-ratio);
  overflow: hidden;
  border-radius: var(--radius-sm);
  background:
    linear-gradient(135deg, rgba(124,92,255,0.1), rgba(0,210,255,0.05)),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 12px, transparent 12px 24px);
  border: 1px solid var(--line);
  isolation: isolate;
}

/* <figure class="media-frame"> — caption below; image tile uses same aspect as div.media-frame */
figure.media-frame {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto auto;
  gap: 0.55rem;
  margin: 0;
  overflow: visible;
  aspect-ratio: unset;
  background: transparent;
  border: none;
  isolation: auto;
}
figure.media-frame > img {
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  aspect-ratio: var(--media-aspect-ratio);
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(124,92,255,0.1), rgba(0,210,255,0.05)),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 12px, transparent 12px 24px);
  transition: transform var(--t-slow), opacity var(--t-med);
}
figure.media-frame > .frame-corners {
  grid-column: 1;
  grid-row: 1;
  align-self: start;
  width: 100%;
  aspect-ratio: var(--media-aspect-ratio);
  position: relative;
  z-index: 2;
  pointer-events: none;
}
figure.media-frame > figcaption {
  grid-column: 1;
  grid-row: 2;
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.74rem;
  color: var(--fg-mute);
  letter-spacing: 0.02em;
  line-height: 1.4;
}
figure.media-frame figcaption .caption-note {
  color: var(--accent-3);
  opacity: 0.85;
}
figure.media-frame:hover > img { transform: scale(1.05); }
figure.media-frame > img.media-empty { opacity: 0; }
figure.media-frame:has(img.media-empty)::before {
  content: 'add media';
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  aspect-ratio: var(--media-aspect-ratio);
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--fg-mute);
  text-transform: uppercase;
  pointer-events: none;
  z-index: 1;
  background:
    radial-gradient(circle at 25% 25%, rgba(124,92,255,0.18), transparent 40%),
    radial-gradient(circle at 75% 75%, rgba(0,210,255,0.14), transparent 40%),
    linear-gradient(135deg, rgba(124,92,255,0.1), rgba(0,210,255,0.05)),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 12px, transparent 12px 24px);
}

/* div.media-frame — image fills the fixed-aspect box */
.media-frame:not(figure) picture {
  display: block;
  width: 100%;
  height: 100%;
}
.media-frame:not(figure) img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow), opacity var(--t-med);
}
.media-frame:not(figure):hover img { transform: scale(1.05); }

/* When no image is available, show clean placeholder (non-figure only — figures use grid rule above) */
.media-frame:not(figure) img.media-empty { opacity: 0; }
.media-frame:not(figure):has(img.media-empty)::before,
.media-frame:not(figure):has(img:not([src]))::before {
  content: 'add media';
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem; letter-spacing: 0.2em;
  color: var(--fg-mute); text-transform: uppercase;
  pointer-events: none;
}
.media-frame:not(figure):has(img.media-empty)::after {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 25% 25%, rgba(124,92,255,0.18), transparent 40%),
    radial-gradient(circle at 75% 75%, rgba(0,210,255,0.14), transparent 40%);
  pointer-events: none;
}

/* Decorative corner brackets */
.frame-corners i {
  position: absolute;
  width: 14px; height: 14px;
  border: 1.5px solid var(--accent-2);
  pointer-events: none;
  opacity: 0.7;
  transition: opacity var(--t-fast), border-color var(--t-fast);
}
.frame-corners i:nth-child(1) { top: 8px;    left: 8px;    border-right: 0; border-bottom: 0; }
.frame-corners i:nth-child(2) { top: 8px;    right: 8px;   border-left: 0;  border-bottom: 0; }
.frame-corners i:nth-child(3) { bottom: 8px; left: 8px;    border-right: 0; border-top: 0; }
.frame-corners i:nth-child(4) { bottom: 8px; right: 8px;   border-left: 0;  border-top: 0; }
.media-frame:hover .frame-corners i { opacity: 1; border-color: var(--accent-3); }

/* Strip of media (under each experience / project) */
.media-strip {
  display: grid;
  /* Fixed-width tracks: every tile is the same width regardless of how many fit per row,
     so 2-frame and 3-frame strips render at identical tile sizes. */
  grid-template-columns: repeat(
    auto-fit,
    minmax(min(100%, var(--media-tile-width)), var(--media-tile-width))
  );
  justify-content: start;
  gap: 0.8rem;
  margin-top: 1.6rem;
  align-items: start;
}

/* When a strip has a single tile, keep the same fixed tile width
   so it doesn't stretch across the whole card. */
.media-strip:has(> :only-child),
.media-strip-compact {
  grid-template-columns: var(--media-tile-width);
}

/* On mobile the parent card is often narrower than --media-tile-width,
   which makes the fixed tracks above overflow horizontally. Collapse the
   strip to a single full-width column so the card never blows out. */
@media (max-width: 720px) {
  .media-strip,
  .media-strip:has(> :only-child),
  .media-strip-compact {
    grid-template-columns: minmax(0, 1fr);
  }
  .media-strip > .media-frame { width: 100%; max-width: 100%; }
}

/* Toggle pill for collapsing project media on mobile (hidden on desktop;
   the JS only injects it when a strip has more than one frame). */
.media-strip-toggle { display: none; }

@media (max-width: 720px) {
  /* Collapse each project's media strip on mobile so a 6-frame card doesn't
     dominate the screen. The fade overlay hints there is more to see. */
  .project-card .media-strip {
    position: relative;
    max-height: 19rem;
    overflow: hidden;
    /* Reserve space for the JS-injected toggle pill so it does not create a
       post-paint layout shift when the button appears. */
    margin-bottom: 3.25rem;
    transition: max-height 0.45s ease;
  }
  .project-card .media-strip.is-expanded {
    max-height: 600vh;
  }
  .project-card .media-strip:not(.is-expanded)::after {
    content: '';
    position: absolute;
    inset: auto 0 0 0;
    height: 4.5rem;
    background: linear-gradient(to top, var(--bg-card) 10%, rgba(20, 20, 35, 0));
    pointer-events: none;
  }
  [data-theme='light'] .project-card .media-strip:not(.is-expanded)::after {
    background: linear-gradient(to top, rgba(247, 247, 250, 0.95) 10%, rgba(247, 247, 250, 0));
  }

  .media-strip-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    margin-top: 0.85rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--fg-dim);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: transparent;
    transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
  }
  .media-strip-toggle:hover,
  .media-strip-toggle:focus-visible {
    border-color: var(--accent-2);
    color: var(--fg);
    background: rgba(0, 210, 255, 0.06);
  }
  .media-strip-toggle svg {
    width: 12px; height: 12px;
    transition: transform var(--t-fast);
  }
  .media-strip-toggle[aria-expanded='true'] svg {
    transform: rotate(180deg);
  }
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: start;
}
@media (min-width: 900px) {
  .about-grid { grid-template-columns: 360px 1fr; gap: 4rem; }
}

.about-portrait { display: grid; gap: 1.2rem; }
.portrait-frame { aspect-ratio: var(--media-aspect-ratio); }

.about-card { padding: 1.4rem; display: grid; gap: 0.7rem; }
.about-card-row { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.92rem; }
.about-card-row .k { color: var(--fg-mute); font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; }
.about-card-row .v { color: var(--fg); display: inline-flex; align-items: center; gap: 0.4rem; }
.dot.live { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-4); box-shadow: 0 0 8px var(--accent-4); display: inline-block; }

.about-copy p { color: var(--fg-dim); margin-bottom: 1.2rem; font-size: 1.04rem; }
.about-copy .lead { font-size: 1.3rem; color: var(--fg); line-height: 1.45; }
.about-copy strong { color: var(--fg); font-weight: 500; }
.about-copy em { color: var(--accent-3); font-style: normal; }
.inline-link {
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 500;
}

.about-pills {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-top: 1.6rem;
}
.pill {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--fg-dim);
  font-family: 'JetBrains Mono', monospace;
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}
.pill:hover { border-color: var(--accent-2); color: var(--accent-2); }

/* ---------- Stack & Tools (collapsible) ---------- */
.stack-summary {
  padding: 1.2rem 1.4rem;
  margin-bottom: 1.2rem;
}
.stack-summary-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.stack-summary-meta {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  flex-shrink: 0;
}
.stack-count {
  font-family: 'Instrument Serif', serif;
  font-size: 2.2rem;
  line-height: 1;
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stack-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
}
.stack-summary-pills {
  display: flex;
  gap: 0.4rem;
  flex: 1 1 200px;
  flex-wrap: wrap;
  min-width: 0;
}
.stack-summary-pills span {
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.stack-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--fg);
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
  flex-shrink: 0;
}
.stack-toggle:hover {
  border-color: var(--accent-2);
  color: var(--accent-2);
  background: rgba(0, 210, 255, 0.06);
}
.stack-toggle svg {
  width: 14px; height: 14px;
  transition: transform var(--t-med);
}
.stack-toggle .label-hide { display: none; }
.stack-toggle[aria-expanded="true"] .label-show { display: none; }
.stack-toggle[aria-expanded="true"] .label-hide { display: inline; }
.stack-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }

.stack-panel {
  overflow: hidden;
}
.stack-panel[hidden] { display: none; }

/* When panel opens, animate height + content */
.stack-panel.is-open .skill-groups {
  animation: stackFadeIn 0.5s cubic-bezier(.2, .8, .2, 1) both;
}
@keyframes stackFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Skills (used inside .stack-panel) ---------- */
.skill-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.skill-group { padding: 1.4rem 1.4rem 1.6rem; transition: transform var(--t-med), border-color var(--t-med); }
.skill-group:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.skill-group h3 {
  font-size: 0.78rem; font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 1rem;
}
.skill-group ul { display: flex; flex-direction: column; gap: 0.45rem; }
.skill-group li {
  font-size: 0.95rem;
  color: var(--fg);
  position: relative; padding-left: 1.1rem;
}
.skill-group li::before {
  content: '›';
  position: absolute; left: 0; top: 0;
  color: var(--accent-3);
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- Experience timeline ---------- */
.timeline {
  position: relative;
  display: grid;
  gap: 2rem;
  /* Defensive: clip any momentary horizontal overshoot from the slide-in
     animation so it can never cause a body-level scrollbar on mobile. */
  overflow-x: clip;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 80px; top: 0; bottom: 0;
  width: 1px; background: linear-gradient(to bottom, transparent, var(--line-strong) 8%, var(--line-strong) 92%, transparent);
}
@media (max-width: 760px) {
  .timeline::before { left: 18px; }
}

.exp-item {
  display: grid;
  grid-template-columns: 1fr;
  padding: 1.6rem;
  position: relative;
  /* Prevent grid items from forcing the card wider than its parent on mobile,
     and let long inline strings (URLs, hyphenated words) break instead of overflowing. */
  min-width: 0;
  overflow-wrap: anywhere;
  transition: transform var(--t-med), border-color var(--t-med);
}
.exp-item > * { min-width: 0; }
@media (min-width: 760px) {
  .exp-item {
    grid-template-columns: 200px 1fr;
    gap: 2rem;
    padding: 2rem 2.2rem;
  }
}
@media (max-width: 480px) {
  .exp-item { padding: 1.25rem 1.1rem; }
}
.exp-item:hover { border-color: var(--line-strong); transform: translateY(-2px); }

.exp-meta {
  display: flex; flex-direction: column; gap: 0.3rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
}
.exp-date { color: var(--accent-2); letter-spacing: 0.06em; }
.exp-loc { color: var(--fg-mute); }

.exp-head { margin-bottom: 1rem; }
.exp-role {
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
}
.exp-company {
  color: var(--fg-dim);
  font-size: 0.95rem;
  font-family: 'JetBrains Mono', monospace;
}

.exp-points { display: grid; gap: 0.6rem; }
.exp-points li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--fg-dim);
  font-size: 0.97rem;
  line-height: 1.55;
}
.exp-points li::before {
  content: ''; position: absolute;
  left: 0; top: 0.6rem;
  width: 8px; height: 1px;
  background: var(--accent-3);
}
.exp-points strong { color: var(--fg); font-weight: 500; }
.exp-summary { color: var(--fg-dim); }

/* Mini-blocks inside an experience entry — used for Web Wizards SG */
.exp-blocks {
  display: grid;
  gap: 1.1rem;
  margin-top: 0.25rem;
}
.exp-block {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem 0.95rem;
  background: rgba(255, 255, 255, 0.015);
}
[data-theme='light'] .exp-block { background: rgba(0, 0, 0, 0.015); }
.exp-block-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-2);
  margin-bottom: 0.55rem;
}
.exp-block .exp-points { gap: 0.45rem; }
.exp-block .exp-points li { font-size: 0.94rem; }
@media (min-width: 900px) {
  .exp-blocks { grid-template-columns: 1fr 1fr; }
}

/* ---------- Projects ---------- */
.project-filters {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 2rem;
}
.filter-pill {
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--fg-dim);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.04em;
  transition: all var(--t-fast);
}
.filter-pill:hover { color: var(--fg); border-color: var(--fg-dim); }
.filter-pill.active {
  background: var(--grad-1);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 8px 24px -10px rgba(124,92,255,0.6);
}

/* Single-column rich list (each project gets full breathing room) */
.project-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
}
.project-card {
  display: grid;
  grid-template-columns: 1fr;
  padding: 1.6rem;
  position: relative;
  transition: transform var(--t-med), border-color var(--t-med);
  overflow: hidden;
}
@media (min-width: 880px) {
  .project-card {
    grid-template-columns: 220px 1fr;
    gap: 2rem;
    padding: 2rem 2.2rem;
  }
}
.project-card.hidden { display: none; }
.project-card:hover { border-color: var(--line-strong); }

/* Featured project — subtle accent border only (gradient glow removed) */
.project-card.featured {
  border-color: rgba(124, 92, 255, 0.35);
  box-shadow: 0 30px 80px -50px rgba(124, 92, 255, 0.5);
}

.project-meta {
  display: flex; flex-direction: column; gap: 0.6rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.76rem;
  align-self: start;
}
.project-date { color: var(--accent-2); letter-spacing: 0.06em; }
.project-assoc {
  color: var(--fg-mute);
  display: flex; align-items: center; gap: 0.5rem;
  line-height: 1.45;
}
.assoc-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 8px var(--accent-3);
  flex-shrink: 0;
  margin-top: 5px;
  align-self: start;
}
.project-badge {
  display: inline-block;
  padding: 0.25rem 0.7rem;
  border: 1px solid var(--accent-4);
  border-radius: 999px;
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-4);
  align-self: start;
  width: fit-content;
}

.project-content { display: grid; gap: 1rem; min-width: 0; }

.project-head { display: grid; gap: 0.25rem; }
.project-head h3 {
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.25;
}
.project-client {
  color: var(--fg-dim);
  font-size: 0.92rem;
  font-family: 'JetBrains Mono', monospace;
}

.project-desc, .project-desc-alt {
  color: var(--fg-dim);
  font-size: 0.97rem;
  line-height: 1.6;
}
.project-desc strong { color: var(--fg); font-weight: 500; }

.project-section { display: grid; gap: 0.5rem; }
.project-section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.project-features {
  display: grid; gap: 0.55rem;
}
.project-features li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--fg-dim);
  font-size: 0.95rem;
  line-height: 1.55;
}
.project-features li::before {
  content: ''; position: absolute;
  left: 0; top: 0.6rem;
  width: 8px; height: 1px;
  background: var(--accent-3);
}
.project-features.check li::before {
  content: '✓';
  width: auto; height: auto;
  background: none;
  top: 0;
  color: var(--accent-4);
  font-weight: 700;
  font-size: 0.95rem;
}
.project-features strong { color: var(--fg); font-weight: 500; }

.project-tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
}
.project-tags span {
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
  transition: border-color var(--t-fast), color var(--t-fast);
}
.project-tags span:hover { border-color: var(--accent-2); color: var(--accent-2); }

.project-outcome {
  border-left: 2px solid var(--accent-4);
  padding: 0.7rem 1rem;
  background: rgba(200, 255, 0, 0.04);
  border-radius: 0 8px 8px 0;
  display: grid;
  gap: 0.3rem;
}
.outcome-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-4);
}
.project-outcome p {
  color: var(--fg);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Media gallery within projects */
.project-card .media-strip { margin-top: 0.6rem; }

/* ---------- Education ---------- */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.4rem;
  align-items: stretch;
}
.edu-card {
  padding: 1.2rem;
  display: grid;
  align-content: start;
  transition: transform var(--t-med), border-color var(--t-med);
}
.edu-card:hover { border-color: var(--accent-2); }
.edu-body {
  display: grid;
  grid-template-rows: auto auto 1fr;     /* date, title (variable lines), school pinned bottom */
  gap: 0.3rem;
  align-content: start;
}
.edu-body .edu-school { align-self: end; margin-top: 0.4rem; }
.edu-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.76rem;
  color: var(--accent-2);
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}
.edu-body h3 {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 0.3rem;
}
.edu-school { color: var(--fg-dim); font-size: 0.92rem; }

/* ---------- Awards & recognition ---------- */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.4rem;
}
.award-card {
  min-width: 0;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  transition: transform var(--t-med), border-color var(--t-med), box-shadow var(--t-med);
}
.award-card:hover {
  border-color: rgba(0, 210, 255, 0.35);
  box-shadow: 0 24px 70px -42px rgba(0, 210, 255, 0.55);
}
.award-media {
  min-height: 25rem;
  position: relative;
  overflow: hidden;
  border-right: 1px solid var(--line);
  background: var(--bg-soft);
}
.award-media::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 55%, rgba(7, 7, 13, 0.82) 100%);
}
.award-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow), filter var(--t-slow);
}
.award-card:hover .award-media img { transform: scale(1.035); }
.award-rank {
  position: absolute;
  z-index: 1;
  left: 1rem;
  bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.72rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  color: #fff;
  background: rgba(7, 7, 13, 0.74);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.award-rank span {
  color: var(--accent-4);
  font-weight: 700;
}
.award-rank-presenter span { color: var(--accent-2); }
.award-body {
  padding: clamp(1.25rem, 2.5vw, 2rem);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.award-meta {
  width: 100%;
  margin-bottom: 2rem;
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  color: var(--accent-2);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.award-program {
  margin-bottom: 0.65rem;
  color: var(--fg-mute);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.award-body h3 {
  margin-bottom: 0.8rem;
  font-size: clamp(1.65rem, 2.8vw, 2.35rem);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.045em;
}
.award-org {
  margin-bottom: 1.15rem;
  min-height: 3.3rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--fg);
  font-size: 1.08rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.award-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}
.award-logo-bytedance {
  min-height: 3rem;
  padding: 0.78rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  background: #111;
}
.award-logo-bytedance img {
  width: 9.4rem;
  height: auto;
}
.award-logo-openai {
  width: 3rem;
  height: 3rem;
  padding: 0.55rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 10px;
  background: #fff;
}
.award-logo-openai img {
  width: 100%;
  height: 100%;
}
.award-description {
  color: var(--fg-dim);
  font-size: 0.94rem;
  line-height: 1.65;
}
@media (max-width: 1080px) {
  .awards-grid { grid-template-columns: 1fr; }
  .award-media { min-height: 22rem; }
}
@media (max-width: 620px) {
  .award-card { grid-template-columns: 1fr; }
  .award-media {
    min-height: auto;
    aspect-ratio: 4 / 3;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .award-meta { margin-bottom: 1.4rem; }
}

/* ---------- Workshops & events ---------- */
.event-feature {
  padding: clamp(1rem, 2vw, 1.4rem);
  margin-bottom: 1.4rem;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  overflow: hidden;
}
.event-copy {
  padding: clamp(0.4rem, 1.5vw, 1rem);
  display: flex;
  flex-direction: column;
}
.event-meta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.event-meta span {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.event-meta span::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-4);
}
.event-label {
  margin-bottom: 0.55rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
}
.event-copy h3 {
  margin-bottom: 1.35rem;
  font-size: clamp(1.55rem, 3vw, 2.4rem);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.04em;
}
.event-story {
  display: grid;
  gap: 0.85rem;
}
.event-story p {
  color: var(--fg-dim);
  font-size: 0.93rem;
  line-height: 1.7;
}
.event-takeaway {
  margin-top: 1.6rem;
  padding: 1rem 1.1rem;
  border-left: 2px solid var(--accent-4);
  border-radius: 0 8px 8px 0;
  background: rgba(200, 255, 0, 0.04);
}
.event-takeaway span {
  display: block;
  margin-bottom: 0.35rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-4);
}
.event-takeaway p {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--fg);
}
.event-gallery {
  min-height: 34rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: minmax(0, 1.35fr) minmax(0, 0.65fr);
  gap: 0.75rem;
}
.event-photo {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
}
.event-photo-main { grid-column: 1 / -1; }
.event-gallery-two {
  grid-template-columns: 1fr;
  grid-template-rows: repeat(2, minmax(0, 1fr));
}
.event-gallery-single {
  display: block;
  min-height: 34rem;
}
.event-gallery-single .event-photo {
  width: 100%;
  height: 100%;
}
.event-gallery-single .event-photo img {
  object-position: center 32%;
}
.event-feature-reverse .event-gallery { order: -1; }
.event-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow), filter var(--t-slow);
}
.event-photo:hover img { transform: scale(1.025); }
@media (max-width: 900px) {
  .event-feature { grid-template-columns: 1fr; }
  .event-feature-reverse .event-gallery { order: initial; }
  .event-gallery { min-height: 30rem; }
}
@media (max-width: 560px) {
  .event-feature { padding: 0.8rem; }
  .event-copy { padding: 0.5rem; }
  .event-meta { flex-wrap: wrap; }
  .event-gallery {
    min-height: auto;
    grid-template-columns: 1fr;
    grid-template-rows: repeat(3, auto);
  }
  .event-gallery-single { display: block; }
  .event-photo,
  .event-photo-main { grid-column: 1; aspect-ratio: 4 / 3; }
}

/* ---------- Certifications ---------- */
.cert-count {
  display: inline-block;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  background: var(--grad-1);
  color: #fff;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  font-weight: 600;
  margin-right: 0.35rem;
  vertical-align: 0.04em;
  box-shadow: 0 6px 18px -8px rgba(124,92,255,0.6);
}

.cert-filters {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 2rem;
}
/* Reuses .filter-pill styles from .project-filters */

.cert-groups {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
.cert-group-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-4);
  margin: 0 0 1.05rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
}
/* Hide whole category blocks when every card inside is filtered out */
.cert-group:not(:has(.cert-card:not(.hidden))) {
  display: none;
}

/* Collapsed state — show only the top featured credentials by default */
.cert-groups.is-collapsed .cert-card:not([data-featured="1"]) { display: none; }
.cert-groups.is-collapsed .cert-group:not(:has(.cert-card[data-featured="1"]:not(.hidden))) {
  display: none;
}

.cert-toggle-wrap { display: flex; justify-content: center; margin-top: 2rem; }
.cert-toggle {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--fg);
  background: rgba(255, 255, 255, 0.02);
  transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
}
.cert-toggle:hover { border-color: var(--accent-2); transform: translateY(-1px); }
.cert-toggle svg { width: 1em; height: 1em; transition: transform var(--t-fast); }
.cert-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.cert-toggle .label-hide { display: none; }
.cert-toggle[aria-expanded="true"] .label-show { display: none; }
.cert-toggle[aria-expanded="true"] .label-hide { display: inline; }

.cert-grid {
  display: grid;
  /* Fixed-width tracks: no 1fr growth, so every card (and its media row) stays the same width
     for a given breakpoint. min(100%, …) lets a single column shrink on very narrow viewports. */
  grid-template-columns: repeat(
    auto-fit,
    minmax(min(100%, var(--cert-card-width)), var(--cert-card-width))
  );
  justify-content: center;
  gap: 1.2rem;
  align-items: stretch;
}
.cert-card {
  padding: 0.95rem;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto 1fr;
  gap: 0.7rem;
  align-content: stretch;
  width: 100%;
  min-width: 0;
  min-height: var(--cert-card-min-height);
  transition: transform var(--t-med), border-color var(--t-med), background var(--t-med);
  opacity: 1;
  background: rgba(20, 20, 35, 0.78);
  border-color: var(--line-strong);
  box-shadow: 0 8px 28px -16px rgba(0, 0, 0, 0.6);
}
[data-theme='light'] .cert-card { background: rgba(255, 255, 255, 0.85); }
.cert-card.hidden { display: none; }
.cert-card:hover { border-color: var(--accent-3); background: rgba(20, 20, 35, 0.9); }
[data-theme='light'] .cert-card:hover { background: rgba(255, 255, 255, 0.95); }

/* Square logo tile: physical size is --cert-media-size whenever the card is wide enough;
   if the card is narrower, width and height shrink together (aspect-ratio). */
.cert-card .media-frame.cert-media {
  width: min(var(--cert-media-size), 100%);
  max-width: 100%;
  aspect-ratio: 1 / 1;
  height: auto;
  box-sizing: border-box;
  min-height: 0;
  margin-inline: auto;
  justify-self: center;
}

/* Logo-style images inside cert media frames — assume vendor logo on a clean white card */
.cert-card .media-frame:has(img.logo) {
  background: #ffffff;
  border-color: rgba(10, 10, 30, 0.08);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 1),
    inset 0 -1px 0 rgba(10, 10, 30, 0.06);
}
.cert-card .media-frame.cert-media img.logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 0.95rem;
  box-sizing: border-box;
  background: transparent;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.08));
  transition: transform var(--t-slow);
}
.cert-card .media-frame.cert-media:hover img.logo { transform: scale(1.06); }

/* Corner brackets read better in dark blue against the white card */
.cert-card .media-frame:has(img.logo) .frame-corners i {
  border-color: rgba(10, 10, 30, 0.4);
  opacity: 0.55;
}
.cert-card .media-frame:has(img.logo):hover .frame-corners i {
  border-color: var(--accent);
  opacity: 0.9;
}

.cert-body {
  display: grid;
  gap: 0.45rem;
  align-content: start;
  min-height: var(--cert-body-min-height);
}

.cert-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}
.cert-year {
  color: var(--accent-2);
  text-transform: uppercase;
}
.cert-issuer {
  color: var(--fg-mute);
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cert-body h3 {
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.4;
  min-height: 2.6rem; /* ~2 lines; body min-height handles overall block */
}

.cert-id {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.74rem;
  color: var(--fg-mute);
  line-height: 1.45;
}
.cert-id .cert-org {
  position: relative;
  padding-left: 0.7rem;
  color: var(--fg-dim);
  letter-spacing: 0.01em;
}
.cert-id .cert-org::before {
  content: '';
  position: absolute;
  left: 0; top: 0.55em;
  width: 0.4rem; height: 1px;
  background: var(--accent-2);
  opacity: 0.7;
}

.cert-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.cert-tags span {
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 0.66rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.cert-tags span.expired {
  border-color: rgba(255, 110, 199, 0.3);
  color: var(--accent-3);
  text-transform: none;
  letter-spacing: 0.02em;
}

/* ---------- Publications ---------- */
.pub-list {
  /* Two-up on desktop, single column on mobile. align-items: stretch (default)
     makes side-by-side cards share the row's height so headings, body and CTAs
     line up across siblings even when one heading wraps more lines than another. */
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: 1rem;
  align-items: stretch;
}
.pub-list li {
  padding: 0;
  display: flex; /* let .pub-link fill the cell so equal-height cards line up */
  transition: transform var(--t-med), border-color var(--t-med);
  overflow: hidden;
}
.pub-list li:hover { border-color: var(--accent-2); transform: translateY(-2px); }

.pub-link {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 1.2rem;
  /* Icon hugs the top so a wrapped heading on one card doesn't push the icon
     down — keeps icons visually aligned across all items. */
  align-items: start;
  padding: 1.4rem 1.6rem;
  width: 100%;
  color: inherit;
  text-decoration: none;
}
.pub-icon {
  width: 48px; height: 48px;
  flex: none;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--grad-2);
  color: #fff;
  transition: transform var(--t-fast);
}
.pub-icon svg { width: 22px; height: 22px; }

@media (max-width: 720px) {
  .pub-link {
    grid-template-columns: 40px 1fr;
    gap: 0.9rem;
    padding: 1.15rem 1.2rem;
  }
  .pub-icon { width: 40px; height: 40px; border-radius: 9px; }
  .pub-icon svg { width: 18px; height: 18px; }
  .pub-list h3 { font-size: 1rem; line-height: 1.35; }
  .pub-list p  { font-size: 0.88rem; line-height: 1.45; }
}
.pub-link:hover .pub-icon { transform: rotate(-6deg) scale(1.05); }

.pub-body {
  display: flex;
  flex-direction: column;
  min-width: 0;
  /* Stretch to the grid cell's height so margin-top:auto on .pub-cta can pin
     the CTA to the bottom and align it across sibling cards. */
  align-self: stretch;
}
.pub-list h3 {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
  transition: color var(--t-fast);
}
.pub-list p { color: var(--fg-dim); font-size: 0.92rem; margin-bottom: 0.55rem; }
.pub-link:hover h3 { color: var(--accent-2); }

.pub-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--accent-2);
  margin-top: auto;
  align-self: flex-start;
  transition: gap var(--t-fast), color var(--t-fast);
}
.pub-cta svg { width: 14px; height: 14px; transition: transform var(--t-fast); }
.pub-link:hover .pub-cta { color: var(--accent-3); gap: 0.6rem; }
.pub-link:hover .pub-cta svg { transform: translate(2px, -2px); }

/* ---------- Contact ---------- */
.contact-card {
  padding: clamp(2rem, 5vw, 4rem);
  display: grid; gap: 2rem;
  position: relative;
  overflow: hidden;
}
.contact-card::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 60%; height: 200%;
  background: radial-gradient(circle, rgba(124,92,255,0.25), transparent 60%);
  pointer-events: none;
}
@media (min-width: 760px) {
  .contact-card { grid-template-columns: 1.4fr 1fr; align-items: center; gap: 3rem; }
}
.contact-copy h3 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.8rem;
}
.contact-copy p { color: var(--fg-dim); font-size: 1.02rem; }
.contact-actions { display: grid; gap: 0.7rem; position: relative; z-index: 1; }
.contact-actions .btn { justify-content: center; }

/* ---------- Footer ---------- */
.footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem var(--pad) 3rem;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  font-size: 0.85rem;
  color: var(--fg-mute);
  font-family: 'JetBrains Mono', monospace;
  flex-wrap: wrap;
}
.footer-meta { display: inline-flex; align-items: center; gap: 0.7rem; }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.92);
  display: none;
  align-items: center; justify-content: center;
  padding: 2rem;
  /* Sit above third-party widgets (e.g. the Botpress webchat uses a near-max
     z-index) so the overlay and its close button are never intercepted. */
  z-index: 2147483647;
  backdrop-filter: blur(8px);
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 95%; max-height: 90vh;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  animation: zoomIn 0.3s ease;
}
@keyframes zoomIn { from { transform: scale(0.92); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.lightbox-close {
  position: absolute; top: 1.2rem; right: 1.4rem;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  color: #fff;
  font-size: 1.6rem;
  display: grid; place-items: center;
  transition: background var(--t-fast);
  z-index: 10;
}
.lightbox-close:hover { background: rgba(255,255,255,0.18); }

/* ---------- Animations: reveal initial state ---------- */
.reveal { opacity: 0; transform: translateY(40px); will-change: transform, opacity; }

/* Reduce-motion respect */
@media (prefers-reduced-motion: reduce) {
  .blob, .marquee-track, .scroll-line::after, .logo-pulse, .hero-title i { animation: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}