/* ===== Reset & Variables ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0a;
  --bg-alt: #111111;
  --card: #161616;
  --line: #262626;
  --text: #e8e8e8;
  --muted: #9a9a9a;
  --accent: #d4ff3f;
  --accent-dim: #a8cc2f;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

section { padding: 80px 0; }

/* ===== Header ===== */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: background 0.3s;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  align-items: center;
}
.nav-links a {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 100%; height: 2px;
  background: var(--accent);
}

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.88rem;
  transition: all 0.25s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: #0a0a0a;
}
.btn-primary:hover { background: var(--accent-dim); transform: translateY(-2px); }
.btn-outline {
  border: 1px solid var(--line);
  color: var(--text);
  background: transparent;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
}
.hamburger span {
  width: 24px; height: 2px;
  background: var(--text);
  transition: 0.3s;
}

/* ===== Hero ===== */
.hero {
  padding-top: 160px;
  padding-bottom: 60px;
  background: radial-gradient(ellipse at 70% 20%, rgba(212,255,63,0.06), transparent 60%);
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  max-width: 14ch;
  margin-bottom: 28px;
}
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p.lead {
  max-width: 680px;
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 32px;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}
.tag {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.85rem;
  color: var(--muted);
  transition: all 0.2s;
}
.tag:hover { border-color: var(--accent); color: var(--accent); }

/* ===== Marquee ===== */
.marquee {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  padding: 18px 0;
  background: var(--bg-alt);
}
.marquee-track {
  display: flex;
  white-space: nowrap;
  width: max-content;
  animation: scroll 40s linear infinite;
}
.marquee-track span {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 0 12px;
}
.marquee-track span::after { content: '•'; color: var(--accent); margin-left: 24px; }
@keyframes scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ===== Section headings ===== */
.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.section-sub { color: var(--muted); max-width: 640px; margin-bottom: 48px; }

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.about-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 20px;
}
.about-card h4 {
  color: var(--accent);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.about-card ul { list-style: none; }
.about-card li {
  padding: 8px 0 8px 24px;
  position: relative;
  color: var(--muted);
}
.about-card li::before {
  content: '→';
  position: absolute; left: 0;
  color: var(--accent);
}
.about-card p { color: var(--muted); margin-bottom: 14px; }

/* ===== Work cards ===== */
.work-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.work-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px;
  transition: all 0.3s;
}
.work-card:hover { border-color: var(--accent); transform: translateY(-6px); }
.work-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  opacity: 0.4;
  margin-bottom: 16px;
}
.work-card h3 { font-size: 1.25rem; margin-bottom: 12px; }
.work-card p { color: var(--muted); font-size: 0.95rem; margin-bottom: 20px; }
.work-card a {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}
.work-card a:hover { text-decoration: underline; }

/* ===== Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px;
  transition: all 0.3s;
}
.service-card:hover { border-color: var(--accent); background: var(--bg-alt); }
.service-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  background: rgba(212,255,63,0.12);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}
.service-card h3 { font-size: 1.3rem; margin-bottom: 12px; }
.service-card p { color: var(--muted); }

/* ===== CTA banner ===== */
.cta {
  text-align: center;
  background: linear-gradient(135deg, rgba(212,255,63,0.08), transparent);
  border-top: 1px solid var(--line);
}
.cta h2 { font-size: clamp(1.8rem,4vw,2.6rem); font-weight: 800; margin-bottom: 24px; }

/* ===== Research page ===== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.research-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px;
  transition: all 0.3s;
}
.research-item:hover { border-color: var(--accent); transform: translateY(-4px); }
.research-item .num {
  font-size: 3rem; font-weight: 800;
  color: var(--accent); opacity: 0.3; margin-bottom: 10px;
}
.research-item h3 { font-size: 1.3rem; margin-bottom: 12px; }
.research-item p { color: var(--muted); }

.pub-list { display: flex; flex-direction: column; gap: 14px; }
.pub {
  display: flex;
  align-items: center;
  gap: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 28px;
  transition: all 0.25s;
}
.pub:hover { border-color: var(--accent); }
.pub .year {
  font-weight: 800; color: var(--accent);
  font-size: 1.1rem; min-width: 56px;
}
.pub .title { flex: 1; }
.pub .title strong { display: block; }
.pub .title span { color: var(--muted); font-size: 0.85rem; }
.pub .file { color: var(--muted); font-size: 0.85rem; }

/* ===== Gallery ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gallery-item {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  aspect-ratio: 3/4;
  background: var(--card);
  border: 1px solid var(--line);
}
.gallery-item .ph {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1a1a1a, #0d0d0d);
  color: var(--accent);
  font-size: 2.5rem; font-weight: 800; opacity: 0.5;
}
.gallery-item .cap {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
}
.gallery-item .cap .idx { color: var(--accent); font-size: 0.8rem; font-weight: 700; }
.gallery-item .cap .name { font-weight: 600; }

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 56px;
}
.form-group { margin-bottom: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 8px;
  font-weight: 500;
}
input, select, textarea {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 13px 16px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: border 0.2s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}
textarea { resize: vertical; min-height: 120px; }
.form-msg {
  margin-top: 16px;
  padding: 14px;
  border-radius: 10px;
  background: rgba(212,255,63,0.12);
  color: var(--accent);
  font-size: 0.9rem;
  display: none;
}
.contact-info .info-block { margin-bottom: 32px; }
.contact-info h4 {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  margin-bottom: 12px;
}
.contact-info p { color: var(--muted); }

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--line);
  padding: 40px 0;
  background: var(--bg-alt);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-inner .copy { color: var(--muted); font-size: 0.85rem; letter-spacing: 0.05em; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--muted); font-size: 0.85rem; letter-spacing: 0.1em; }
.footer-links a:hover { color: var(--accent); }

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .work-grid, .gallery-grid { grid-template-columns: 1fr 1fr; }
  .services-grid, .research-grid { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: 72px; right: 0;
    width: 75%; height: calc(100vh - 72px);
    background: var(--bg-alt);
    flex-direction: column;
    align-items: flex-start;
    padding: 32px 28px;
    gap: 24px;
    transform: translateX(100%);
    transition: transform 0.3s;
    border-left: 1px solid var(--line);
  }
  .nav-links.open { transform: translateX(0); }
  .nav .btn-primary { display: none; }
  .work-grid, .gallery-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}