/* ================================================================
   Abhinaba Chakraborty — Apple-Style Minimalist Portfolio
   ================================================================ */

/* ================================================================
   RUBIK'S CUBE — CINEMATIC INTRO
   ================================================================ */

/* ── Overlay ── */
.intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  overflow: hidden;
  transition: opacity 1s cubic-bezier(0.4, 0, 0.2, 1);
}
.intro-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

/* ── Animated background ── */
.intro-bg {
  position: absolute;
  inset: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, #1a1a2e 0%, #0f0f1a 40%, #0a0a12 100%);
  animation: bgShift 6s ease-in-out infinite alternate;
}
@keyframes bgShift {
  0%   { transform: translate(0, 0); }
  100% { transform: translate(-5%, 3%); }
}
/* Subtle colored glow */
.intro-bg::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  top: 20%;
  left: 25%;
  background: radial-gradient(circle, rgba(0,113,227,0.08) 0%, transparent 70%);
  animation: glowPulse 4s ease-in-out infinite alternate;
}
.intro-bg::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  bottom: 15%;
  right: 20%;
  background: radial-gradient(circle, rgba(196,30,58,0.06) 0%, transparent 70%);
  animation: glowPulse 5s ease-in-out 1s infinite alternate;
}
@keyframes glowPulse {
  0%   { opacity: 0.4; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.3); }
}

/* ── Ambient particles ── */
.intro-particles {
  position: absolute;
  inset: 0;
  z-index: 1;
}
.intro-particle {
  position: absolute;
  width: var(--size, 3px);
  height: var(--size, 3px);
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
  animation: particleFloat 5s ease-in-out infinite alternate;
}
@keyframes particleFloat {
  0%   { transform: translateY(0) scale(1); opacity: 0; }
  20%  { opacity: 0.6; }
  80%  { opacity: 0.4; }
  100% { transform: translateY(-80px) scale(0.5); opacity: 0; }
}

/* ── Content wrapper (centers cube + name) ── */
.intro-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  gap: 2.5rem;
}

/* ── 3D Scene ── */
.intro-scene {
  perspective: 900px;
  perspective-origin: 50% 45%;
  position: relative;
}

/* ── Cube ── */
.rubik-cube {
  width: 180px;
  height: 180px;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(-25deg) rotateY(-40deg);
  transition: transform 2.5s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* Rotation phases */
.rubik-cube.rotating {
  animation: cubeFloat 2.8s cubic-bezier(0.45, 0.05, 0.55, 0.95) forwards;
}

@keyframes cubeFloat {
  0%   { transform: rotateX(-25deg) rotateY(-40deg); }
  30%  { transform: rotateX(10deg)  rotateY(50deg); }
  55%  { transform: rotateX(-15deg) rotateY(160deg); }
  80%  { transform: rotateX(20deg)  rotateY(280deg); }
  100% { transform: rotateX(-20deg) rotateY(340deg); }
}

/* ── Cube faces: black body + 3×3 grid ── */
.cube-face {
  position: absolute;
  width: 180px;
  height: 180px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 5px;
  padding: 6px;
  background: #111;
  border-radius: 8px;
  backface-visibility: visible;
}

/* Face positioning */
.face-front  { transform: translateZ(90px); }
.face-back   { transform: rotateY(180deg) translateZ(90px); }
.face-right  { transform: rotateY(90deg) translateZ(90px); }
.face-left   { transform: rotateY(-90deg) translateZ(90px); }
.face-top    { transform: rotateX(90deg) translateZ(90px); }
.face-bottom { transform: rotateX(-90deg) translateZ(90px); }

/* ── Individual tiles ── */
.cube-tile {
  background: var(--tile-color, #333);
  border-radius: 4px;
  position: relative;
  /* Start from random position */
  transform: translate3d(var(--start-x), var(--start-y), var(--start-z)) rotate(var(--start-r)) scale(0.3);
  opacity: 0;
  animation: tileAssemble 0.9s cubic-bezier(0.34, 1.56, 0.64, 1) var(--assemble-delay, 0s) forwards;
  /* Glossy highlight */
  box-shadow: inset 0 1px 2px rgba(255,255,255,0.25),
              inset 0 -1px 1px rgba(0,0,0,0.15);
}

/* Subtle highlight gradient on each tile */
.cube-tile::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 4px;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
  pointer-events: none;
}

@keyframes tileAssemble {
  0%   { transform: translate3d(var(--start-x), var(--start-y), var(--start-z)) rotate(var(--start-r)) scale(0.3); opacity: 0; }
  60%  { opacity: 1; }
  100% { transform: translate3d(0, 0, 0) rotate(0deg) scale(1); opacity: 1; }
}

/* ── Dissolve: tiles drift away ── */
.rubik-cube.dissolve .cube-tile {
  animation: tileDrift 0.8s cubic-bezier(0.55, 0, 1, 0.45) var(--dissolve-delay, 0s) forwards;
}

@keyframes tileDrift {
  0%   { transform: translate3d(0,0,0) rotate(0deg) scale(1); opacity: 1; }
  100% { transform: translate3d(var(--drift-x), var(--drift-y), 100px) rotate(var(--drift-r)) scale(0.2); opacity: 0; }
}

/* ── Solve: tile color transition + flash ── */
.cube-tile {
  transition: --tile-color 0.3s ease;
  /* fallback for browsers without @property */
  transition: box-shadow 0.15s ease;
}
.rubik-cube.solving .cube-tile {
  background: var(--tile-color);
}
.cube-tile.flash {
  box-shadow: inset 0 0 12px rgba(255,255,255,0.9),
              0 0 20px rgba(255,255,255,0.4);
  filter: brightness(1.5);
}
.cube-tile.flash::after {
  background: linear-gradient(135deg, rgba(255,255,255,0.6) 0%, transparent 50%);
}

/* ── Reflection ── */
.cube-reflection {
  position: absolute;
  top: 100%;
  left: 0;
  width: 180px;
  height: 180px;
  transform-style: preserve-3d;
  transform: scaleY(-1);
  opacity: 0.12;
  filter: blur(4px);
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.5) 0%, transparent 60%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.5) 0%, transparent 60%);
  pointer-events: none;
}
/* Reflection mirrors the main cube rotation */
.cube-reflection .rubik-cube {
  transform: rotateX(-25deg) rotateY(-40deg);
}
#rubik-cube.rotating ~ .cube-reflection .rubik-cube,
.cube-reflection .rubik-cube {
  animation: cubeFloat 2.8s cubic-bezier(0.45, 0.05, 0.55, 0.95) 1.2s forwards;
}

/* ── Name reveal ── */
.intro-name {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.8s ease, transform 0.8s ease;
  z-index: 3;
}
.intro-name.visible {
  opacity: 1;
  transform: translateY(0);
}
.intro-name-first {
  font-family: 'Inter', sans-serif;
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.9);
}
.intro-name-last {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.5em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}


/* ── Tokens ──────────────────────────────────────────────────── */
:root {
  --bg:          #f5f5f7;
  --bg-card:     #ffffff;
  --bg-nav:      rgba(245,245,247,0.88);

  --text-primary:   #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary:  #a1a1a6;

  --accent:       #0071e3;
  --accent-light: rgba(0,113,227,0.08);

  --border:    rgba(0,0,0,0.08);
  --border-md: rgba(0,0,0,0.13);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.07), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 2px 8px rgba(0,0,0,0.05);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --ease:   cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --t-fast: 0.15s;
  --t:      0.25s;
}

/* ── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { display: block; max-width: 100%; }

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #c7c7cc; border-radius: 99px; }
::selection { background: rgba(0,113,227,0.15); }

/* ── Navbar ──────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  background: var(--bg-nav);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t), box-shadow var(--t);
}

.navbar.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  flex-shrink: 0;
  text-decoration: none;
}
.nav-brand:hover { text-decoration: none; }

/* Tabs */
.nav-tabs {
  display: flex;
  list-style: none;
  gap: 0.1rem;
  flex: 1;
  justify-content: center;
}

.tab-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
  min-height: 36px;
}
.tab-btn:hover { color: var(--text-primary); background: rgba(0,0,0,0.05); }
.tab-btn.active { color: var(--accent); background: var(--accent-light); }

/* Nav CTA */
.nav-cta {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0,113,227,0.3);
  transition: background var(--t-fast), border-color var(--t-fast);
  flex-shrink: 0;
}
.nav-cta:hover { background: var(--accent-light); border-color: var(--accent); text-decoration: none; }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  min-width: 36px;
  min-height: 36px;
  align-items: center;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--t), opacity var(--t);
  transform-origin: center;
}

/* ── Main wrap ───────────────────────────────────────────────── */
.main-wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 80px 2rem 4rem;
}

/* ── Tab panels ──────────────────────────────────────────────── */
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: tabEnter 0.4s var(--ease) both; }
.tab-panel.exiting { animation: tabExit 0.25s var(--ease) both; }

@keyframes tabEnter {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes tabExit {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-8px); }
}

/* ── Tab loading bar ── */
.tab-loading-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), rgba(0,113,227,0.4));
  border-radius: 1px;
  opacity: 0;
  transition: opacity 0.2s;
}
.tab-loading-bar.active {
  opacity: 1;
  width: 100%;
  animation: tabBarSweep 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes tabBarSweep {
  0%   { width: 0; opacity: 1; }
  60%  { width: 100%; opacity: 1; }
  100% { width: 100%; opacity: 0; }
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.6rem 1.3rem;
  border-radius: 99px;
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--t) var(--ease), box-shadow var(--t), background var(--t);
  border: none;
  min-height: 44px;  /* touch-friendly */
}
.btn-pill:hover { transform: translateY(-1px); text-decoration: none; }

.btn-dark { background: var(--text-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-dark:hover { background: #2d2d2f; box-shadow: var(--shadow-md); }

.btn-light { background: var(--bg-card); color: var(--text-primary); box-shadow: var(--shadow-sm); border: 1px solid var(--border); }
.btn-light:hover { background: #fff; box-shadow: var(--shadow-md); }

/* ── Page hero (inner tabs) ──────────────────────────────────── */
.page-hero { padding: 3rem 0 2rem; }
.page-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}
.page-sub { font-size: 1rem; color: var(--text-secondary); }

/* ── Section title ───────────────────────────────────────────── */
.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

/* ================================================================
   ABOUT
   ================================================================ */
.hero {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 3rem;
  align-items: center;
  padding: 3.5rem 0 3rem;
}

.hero-photo {
  width: 180px;
  height: 180px;
  border-radius: var(--radius-xl);
  object-fit: cover;
  box-shadow: var(--shadow-lg);
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.75rem;
}

.hero-name {
  font-size: clamp(2.2rem, 5.5vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 1.1rem;
}

.hero-bio {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 520px;
  margin-bottom: 1.75rem;
}
.hero-bio strong { color: var(--text-primary); font-weight: 600; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }

/* ── Card section ────────────────────────────────────────────── */
.card-section { padding: 2.5rem 0; border-top: 1px solid var(--border); }

/* Interest cards — NO icon, just title + text */
.interest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.interest-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.5rem;
  transition: transform var(--t) var(--ease), box-shadow var(--t);
}
.interest-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.interest-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}
.interest-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* News */
.news-feed { display: flex; flex-direction: column; }

.news-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1.25rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}
.news-row:first-child { border-top: 1px solid var(--border); }

.news-date {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.news-row p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.55; }
.news-row p strong { color: var(--text-primary); }

/* ================================================================
   PROJECTS
   ================================================================ */
.proj-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.1rem;
  padding-bottom: 3rem;
}

.proj-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--t) var(--ease), box-shadow var(--t);
}
.proj-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.proj-card-inner { flex: 1; }

.proj-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.9rem;
}

.proj-chip {
  font-size: 0.69rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
}
.chip-green { background: #e8f9f0; color: #1c7c4a; }
.chip-blue  { background: #eaf2ff; color: #0055b3; }
.chip-gray  { background: #f2f2f7; color: var(--text-tertiary); }

.proj-year { font-size: 0.78rem; color: var(--text-tertiary); font-weight: 500; }

.proj-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}
.proj-desc { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 1rem; }

.proj-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1.1rem; }
.proj-tags span {
  font-size: 0.71rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border-md);
  padding: 0.18rem 0.55rem;
  border-radius: 6px;
}

.proj-link-btn {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  margin-top: 0.25rem;
  transition: color var(--t-fast);
}
.proj-link-btn:hover { text-decoration: underline; }

/* ================================================================
   PUBLICATIONS
   ================================================================ */
.pub-list { display: flex; flex-direction: column; padding-bottom: 3rem; }

.pub-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 1.75rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border);
}
.pub-item:first-child { border-top: 1px solid var(--border); }
.pub-venue-wrap { padding-top: 3px; }

.pub-venue {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.28rem 0.6rem;
  border-radius: 7px;
}
.v-ieee  { background: #eaf2ff; color: #0055b3; border: 1px solid rgba(0,85,179,0.2); }
.v-arxiv { background: #fff0ec; color: #b33a00; border: 1px solid rgba(179,58,0,0.2); }

.pub-title {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 0.45rem;
  text-decoration: none;
  transition: color var(--t);
}
.pub-title:hover { color: var(--accent); }

.pub-authors {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
  line-height: 1.55;
}
.pub-actions { display: flex; flex-wrap: wrap; gap: 0.45rem; }

.pub-btn {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid rgba(0,113,227,0.2);
  padding: 0.25rem 0.65rem;
  border-radius: 7px;
  text-decoration: none;
  transition: background var(--t), border-color var(--t);
  min-height: 30px;
  display: inline-flex;
  align-items: center;
}
.pub-btn:hover { background: rgba(0,113,227,0.14); border-color: rgba(0,113,227,0.35); text-decoration: none; }

.thesis-callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.75rem;
  margin-top: 2rem;
}
.thesis-callout-left { flex: 1; min-width: 240px; }
.thesis-label {
  display: block;
  font-size: 0.73rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.45rem;
}
.thesis-callout-title { font-size: 0.95rem; font-weight: 600; line-height: 1.5; }

/* ================================================================
   EXPERIENCE
   ================================================================ */
.exp-sections { padding-bottom: 3rem; }

.exp-group-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.9rem;
}

.exp-list { display: flex; flex-direction: column; }

.exp-card {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 1.75rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border);
}
.exp-card:first-child { border-top: 1px solid var(--border); }

.exp-card-left {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding-top: 2px;
}
.exp-tenure { font-size: 0.79rem; color: var(--text-tertiary); font-weight: 500; line-height: 1.4; }

.exp-status {
  font-size: 0.67rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.17rem 0.5rem;
  border-radius: 99px;
  width: fit-content;
}
.status-active { background: #e8f9f0; color: #1c7c4a; }

.exp-role { font-size: 0.97rem; font-weight: 700; margin-bottom: 0.2rem; letter-spacing: -0.01em; }
.exp-org { font-size: 0.88rem; color: var(--accent); font-weight: 500; margin-bottom: 0.15rem; }
.exp-location { font-size: 0.8rem; color: var(--text-tertiary); margin-bottom: 0.75rem; }

.exp-details { margin: 0 0 0.85rem 1rem; padding: 0; }
.exp-details li { font-size: 0.87rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 0.25rem; }

.exp-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.exp-tags span {
  font-size: 0.71rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border-md);
  padding: 0.18rem 0.55rem;
  border-radius: 6px;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin-top: 0.75rem;
}
.skill-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.3rem;
}
.skill-block h4 {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}
.skill-chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.skill-chips span {
  font-size: 0.77rem;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg);
  border: 1px solid var(--border-md);
  padding: 0.22rem 0.6rem;
  border-radius: 7px;
  transition: border-color var(--t), background var(--t), color var(--t);
}
.skill-chips span:hover { background: var(--accent-light); border-color: rgba(0,113,227,0.3); color: var(--accent); }

/* ================================================================
   OTHER
   ================================================================ */
.other-grid { display: flex; flex-direction: column; gap: 0.65rem; padding-bottom: 3rem; }

.other-card {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.4rem;
  text-decoration: none;
  transition: transform var(--t) var(--ease), box-shadow var(--t), border-color var(--t);
  min-height: 48px;
}
.other-card:hover { transform: translateX(4px); box-shadow: var(--shadow-md); border-color: var(--border-md); text-decoration: none; }

.other-card > div { display: flex; flex-direction: column; gap: 0.1rem; }
.other-card strong { font-size: 0.92rem; font-weight: 600; color: var(--text-primary); }
.other-card p { font-size: 0.82rem; color: var(--text-secondary); }

/* ================================================================
   SETUP — Prose Article Layout
   ================================================================ */
.prose {
  max-width: 660px;
  padding-bottom: 4rem;
}

.prose h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}
.prose h2:first-child { margin-top: 0; }

.prose h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.prose p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}
.prose p:last-child { margin-bottom: 0; }

.prose p strong {
  color: var(--text-primary);
  font-weight: 600;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(0,113,227,0.3);
  text-underline-offset: 2px;
  transition: text-decoration-color var(--t);
}
.prose a:hover {
  text-decoration-color: var(--accent);
}

.prose code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.84em;
  background: rgba(0,0,0,0.05);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--text-primary);
}

.prose ul, .prose ol {
  margin: 0.75rem 0 1.25rem 1.25rem;
  padding: 0;
}
.prose li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 0.35rem;
}
.prose li strong { color: var(--text-primary); }

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.prose-note {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-style: italic;
  line-height: 1.7;
}

/* ================================================================
   FOOTER
   ================================================================ */
.site-footer { border-top: 1px solid var(--border); background: var(--bg); padding: 1.5rem 2rem; }
.footer-inner {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-inner p { font-size: 0.8rem; color: var(--text-tertiary); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: 0.8rem; color: var(--text-tertiary); text-decoration: none; transition: color var(--t); }
.footer-links a:hover { color: var(--text-primary); }

/* ================================================================
   RESPONSIVE — TABLET  (max 768px)
   ================================================================ */
@media (max-width: 768px) {
  /* Nav: show hamburger, hide tabs & cta by default */
  .nav-inner { padding: 0 1.25rem; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }

  .nav-tabs {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0.75rem 1.25rem 1rem;
    gap: 0.25rem;
    box-shadow: var(--shadow-md);
  }
  .nav-tabs.open { display: flex; }

  .nav-tabs .tab-btn {
    width: 100%;
    text-align: left;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    min-height: 48px;
  }

  /* Main */
  .main-wrap { padding: 72px 1.25rem 3rem; }

  /* Hero — stacked */
  .hero {
    grid-template-columns: 1fr;
    padding: 2.5rem 0 2rem;
    gap: 1.5rem;
  }
  .hero-photo { width: 100px; height: 100px; border-radius: var(--radius-lg); }
  .hero-name { font-size: clamp(2rem, 8vw, 2.8rem); }

  /* Page hero */
  .page-hero { padding: 2rem 0 1.5rem; }

  /* Interest grid — 2 columns on tablet */
  .interest-grid { grid-template-columns: repeat(2, 1fr); }

  /* News rows */
  .news-row { grid-template-columns: 72px 1fr; gap: 1rem; }

  /* Projects — 1 column */
  .proj-list { grid-template-columns: 1fr; }

  /* Publications — stacked */
  .pub-item { grid-template-columns: 1fr; gap: 0.6rem; }
  .pub-venue-wrap { padding-top: 0; }

  /* Experience — stacked */
  .exp-card { grid-template-columns: 1fr; gap: 0.4rem; padding: 1.25rem 0; }
  .exp-card-left { flex-direction: row; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
  .exp-location { margin-bottom: 0.6rem; }

  /* Thesis callout */
  .thesis-callout { flex-direction: column; align-items: flex-start; }

  /* Skills */
  .skills-grid { grid-template-columns: 1fr; }

  /* Footer */
  .footer-inner { flex-direction: column; text-align: center; gap: 0.5rem; }
  .site-footer { padding: 1.25rem; }
}

/* ================================================================
   RESPONSIVE — MOBILE  (max 480px)
   ================================================================ */
@media (max-width: 480px) {
  /* Interest cards — 1 column on small screens */
  .interest-grid { grid-template-columns: 1fr; }

  .hero-actions { flex-direction: column; }
  .btn-pill { justify-content: center; width: 100%; }

  /* Make pub action buttons wrap nicely */
  .pub-actions { gap: 0.4rem; }
  .pub-btn { padding: 0.3rem 0.75rem; }

  /* Exp tags */
  .exp-tags span { font-size: 0.68rem; }
}