/* =====================
   DESIGN TOKENS
   ===================== */
:root {
  --bg:           #0a0a0a;
  --bg-card:      #111111;
  --bg-hover:     #191919;
  --border:       rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.28);
  --text:         #e8e8e8;
  --text-dim:     #888888;
  --text-muted:   #484848;
  --accent:       #c8c8c8;
  --accent-glow:  rgba(255,255,255,0.05);
  --accent-dim:   rgba(255,255,255,0.3);
  --font-sans:    'Space Grotesk', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', monospace;
  --header-h:     64px;
  --max-w:        1100px;
  --pad-x:        3rem;
}

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

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 300;
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  scrollbar-gutter: stable;
  -webkit-font-smoothing: antialiased;
}

/* =====================
   TEXTURE OVERLAYS
   ===================== */
.noise {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size: 64px 64px;
}

/* =====================
   HEADER
   ===================== */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad-x);
  background: rgba(6,6,11,0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.wordmark {
  display: flex;
  align-items: center;
  text-decoration: none;
  opacity: 0.9;
  transition: opacity 0.2s;
}
.wordmark:hover { opacity: 1; }

.logo {
  height: 36px;
  width: auto;
  display: block;
}

nav { display: flex; gap: 2.5rem; }

nav a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}
nav a:hover { color: var(--text-dim); }
nav a.active { color: var(--text); }
nav a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

/* =====================
   LAYOUT SHELL
   ===================== */
main {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

footer {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem var(--pad-x);
  border-top: 1px solid var(--border);
}
footer span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* =====================
   FADE-IN UTILITY
   ===================== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.fade-in.visible { opacity: 1; transform: none; }

.fade-in-x {
  opacity: 0;
  transform: translateX(-16px);
  transition: opacity 0.5s ease, transform 0.5s ease, background 0.2s;
}
.fade-in-x.visible { opacity: 1; transform: none; }

/* stagger children */
.fade-in:nth-child(2) { transition-delay: 0.08s; }
.fade-in:nth-child(3) { transition-delay: 0.16s; }
.fade-in:nth-child(4) { transition-delay: 0.24s; }

/* =====================
   HERO  (index.html)
   ===================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  gap: 5rem;
  padding-top: var(--header-h);
}

.hero-left { flex: 1; }

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  flex-shrink: 0;
  animation: dot-pulse 2.4s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%,100% { box-shadow: 0 0 8px var(--accent); opacity: 1; }
  50%      { box-shadow: 0 0 3px var(--accent); opacity: 0.4; }
}

.hero-name {
  font-size: clamp(2.4rem, 5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 1.75rem;
  background: linear-gradient(140deg, #ffffff 15%, #aaaaaa 55%, #555555 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-bio {
  font-size: 1rem;
  color: var(--text-dim);
  max-width: 400px;
  margin-bottom: 2.25rem;
  line-height: 1.8;
}

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

.btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  transition: color 0.2s, border-color 0.2s, background 0.2s, box-shadow 0.2s;
  background: transparent;
  cursor: pointer;
  display: inline-block;
}
.btn:hover {
  color: var(--accent);
  border-color: var(--border-hover);
  background: var(--accent-glow);
  box-shadow: 0 0 16px var(--accent-glow);
  text-decoration: none;
}

.hero-right {
  flex: 0 0 300px;
}

.photo-frame {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.photo-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, transparent 50%, rgba(255,255,255,0.06) 100%);
  pointer-events: none;
  z-index: 1;
}
.photo-frame img {
  display: block;
  width: 100%;
  height: 380px;
  object-fit: cover;
  filter: grayscale(15%) contrast(1.08) brightness(0.92);
}

/* scan line on photo */
.photo-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0,0,0,0.06) 3px,
    rgba(0,0,0,0.06) 4px
  );
}

/* =====================
   SECTION WRAPPER
   ===================== */
.section {
  padding: 5.5rem 0;
  border-top: 1px solid var(--border);
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  margin-bottom: 2.75rem;
}
.section-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.section-header h2 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text);
}

/* =====================
   RESEARCH GRID
   ===================== */
.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  outline: 1px solid var(--border);
}

.research-card {
  display: flex;
  gap: 1.25rem;
  padding: 1.75rem 1.5rem;
  background: var(--bg);
  transition: background 0.2s;
}
.research-card:hover { background: var(--bg-hover); }

.card-num {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  flex-shrink: 0;
  padding-top: 3px;
}

.card-body h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.45rem;
  line-height: 1.4;
}
.card-body h3 a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s;
}
.card-body h3 a:hover { color: var(--accent); }

.card-body p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 0.75rem;
}

.supervisor {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--accent-dim);
}

/* =====================
   CONTACT LIST
   ===================== */
.contact-list {
  border: 1px solid var(--border);
}

.contact-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: background 0.2s;
}
.contact-row:last-child { border-bottom: none; }
.contact-row:hover { background: var(--bg-hover); }

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.contact-value {
  font-size: 0.875rem;
  color: var(--text-dim);
  transition: color 0.2s;
}
.contact-row:hover .contact-value { color: var(--accent); }

/* =====================
   PAGE HEADER (freestyle)
   ===================== */
.page-hero {
  padding-top: calc(var(--header-h) + 5rem);
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--border);
}

.page-title {
  font-size: clamp(2.4rem, 5vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin: 1rem 0 1.75rem;
  background: linear-gradient(140deg, #ffffff 15%, #aaaaaa 55%, #555555 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-desc {
  font-size: 0.95rem;
  color: var(--text-dim);
  max-width: 580px;
  line-height: 1.8;
}
.page-desc strong {
  color: var(--accent);
  font-weight: 500;
}

/* =====================
   FREESTYLE LAYOUT
   ===================== */
.freestyle-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 3rem;
  align-items: start;
}

/* trick category accordion */
.trick-category {
  border-bottom: 1px solid var(--border);
}
.trick-category:first-child { border-top: 1px solid var(--border); }

.trick-cat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  cursor: pointer;
  user-select: none;
  transition: color 0.2s;
}
.trick-cat-header:hover { color: var(--accent); }

.trick-cat-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.trick-cat-arrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: transform 0.2s;
}
.trick-category.open .trick-cat-arrow { transform: rotate(90deg); }

.trick-cat-body {
  display: none;
  padding-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.trick-category.open .trick-cat-body { display: flex; }

.trick-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-dim);
  cursor: pointer;
  text-decoration: none;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  background: transparent;
}
.trick-tag:hover, .trick-tag.active {
  color: var(--accent);
  border-color: var(--border-hover);
  background: var(--accent-glow);
  text-decoration: none;
}
.trick-tag.locked {
  color: var(--text-muted);
  opacity: 0.5;
  cursor: default;
  pointer-events: none;
}

/* video panel */
.video-panel { position: sticky; top: calc(var(--header-h) + 2rem); }

.video-wrapper {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
  background: var(--bg-card);
  aspect-ratio: 9/16;
  max-height: 540px;
}

.video-wrapper video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #000;
}

.video-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.video-placeholder span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.video-placeholder.hidden { display: none; }

/* =====================
   GALLERY  (lightbox trigger)
   ===================== */
.gallery-section { padding: 4rem 0 5.5rem; }

.gallery-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0.7rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: transparent;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  margin-top: 1.25rem;
}
.gallery-trigger:hover {
  color: var(--accent);
  border-color: var(--border-hover);
  background: var(--accent-glow);
}

/* =====================
   LIGHTBOX
   ===================== */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0,0,0,0.92);
  backdrop-filter: blur(8px);
}
.lightbox.open { display: flex; align-items: center; justify-content: center; }

.lightbox-inner {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox .slide {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.lightbox .slide.active { display: flex; }

.lightbox .slide img {
  max-width: 80vw;
  max-height: 70vh;
  border: 1px solid var(--border);
  border-radius: 2px;
  object-fit: contain;
}

.lightbox .slide figcaption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-align: center;
}

.lb-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.75rem;
  background: rgba(6,6,11,0.7);
  border: 1px solid var(--border);
  border-radius: 2px;
  transition: color 0.2s, border-color 0.2s;
  user-select: none;
}
.lb-btn:hover { color: var(--accent); border-color: var(--border-hover); }
.lb-prev { left: 2rem; }
.lb-next { right: 2rem; }

.lb-close {
  position: fixed;
  top: 2rem; right: 2rem;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.5rem 0.75rem;
  background: rgba(6,6,11,0.7);
  border: 1px solid var(--border);
  border-radius: 2px;
  font-family: var(--font-mono);
  transition: color 0.2s, border-color 0.2s;
}
.lb-close:hover { color: var(--accent); border-color: var(--border-hover); }

/* =====================
   RESPONSIVE
   ===================== */
@media (max-width: 960px) {
  :root { --pad-x: 1.5rem; }

  .hero { flex-direction: column; gap: 3rem; min-height: auto; padding-top: calc(var(--header-h) + 3.5rem); padding-bottom: 4rem; }
  .hero-right { flex: none; width: 100%; }
  .photo-frame img { height: 260px; }
  .hero-name { font-size: 4.5rem; }
  .hero-bio { max-width: 100%; }

  .research-grid { grid-template-columns: 1fr; }

  .freestyle-layout { grid-template-columns: 1fr; }
  .video-panel { position: static; }
  .video-wrapper { aspect-ratio: 16/9; max-height: 320px; }
}

@media (max-width: 600px) {
  nav { gap: 1.5rem; }
  .hero-name { font-size: 3.5rem; }
  .lb-prev { left: 0.5rem; }
  .lb-next { right: 0.5rem; }
}