/* ==========================================================================
   3DV — 3D Vision Group @ NIDA
   Shared stylesheet (dark / tech theme)
   ========================================================================== */

:root {
  --bg: #0b0e14;
  --bg-soft: #11151f;
  --bg-card: #151a26;
  --border: #232a3a;
  --text: #e8ecf4;
  --text-dim: #9aa4b8;
  --text-faint: #667088;
  --accent: #4fd1ff;      /* cyan */
  --accent-2: #8b6cf5;    /* violet */
  --accent-3: #43e6b0;    /* mint */
  --gradient: linear-gradient(100deg, var(--accent) 0%, var(--accent-2) 100%);
  --radius: 14px;
  --maxw: 1140px;
  --font: "Space Grotesk", "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* --------------------------------- Nav --------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 14, 20, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--text);
}
.nav-logo:hover { text-decoration: none; }

.nav-logo .logo-mark {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
}

.nav-logo .logo-3dv {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.active { color: var(--accent); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --------------------------------- Hero --------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 110px 0 120px;
  max-width: 780px;
}

.hero-kicker {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--border);
  background: var(--bg-soft);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: clamp(2.3rem, 5.5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero h1 .grad {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.lead {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 640px;
  margin-bottom: 34px;
}

.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  transition: transform 0.15s, box-shadow 0.15s, background 0.2s;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }

.btn-primary {
  background: var(--gradient);
  color: #0b0e14;
}
.btn-primary:hover { box-shadow: 0 8px 28px rgba(79, 209, 255, 0.35); }

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--bg-soft);
}
.btn-ghost:hover { border-color: var(--accent); }

/* ------------------------------- Sections ------------------------------- */

.section { padding: 88px 0; }
.section.alt { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-head { max-width: 680px; margin-bottom: 48px; }

.section-head .kicker {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.section-head p { color: var(--text-dim); font-size: 1.05rem; }

/* ---------------------------- Project cards ----------------------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 26px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: rgba(79, 209, 255, 0.5);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
}

.card-thumb { aspect-ratio: 16 / 9; overflow: hidden; }
.card-thumb svg, .card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.card-thumb.contain { background: #fff; display: block; }
.card-thumb.contain img { object-fit: contain; padding: 18px; box-sizing: border-box; }

.card-body { padding: 24px 24px 28px; display: flex; flex-direction: column; flex: 1; }

.card-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }

.tag {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  background: var(--bg-soft);
}
.tag.vr { color: var(--accent); border-color: rgba(79, 209, 255, 0.35); }
.tag.gs { color: var(--accent-2); border-color: rgba(139, 108, 245, 0.4); }
.tag.med { color: var(--accent-3); border-color: rgba(67, 230, 176, 0.35); }

.card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 10px; }

.card p { color: var(--text-dim); font-size: 0.96rem; flex: 1; }

.card .card-link {
  margin-top: 18px;
  font-weight: 600;
  font-size: 0.95rem;
}
.card .card-link::after { content: " →"; }

.status-pill {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 999px;
  margin-left: 10px;
  vertical-align: middle;
}
.status-pill.ongoing { background: rgba(79, 209, 255, 0.12); color: var(--accent); }
.status-pill.finished { background: rgba(67, 230, 176, 0.12); color: var(--accent-3); }

/* --------------------------- Project page hero --------------------------- */

.project-hero {
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(ellipse 60% 80% at 80% 0%, rgba(139, 108, 245, 0.12), transparent),
    radial-gradient(ellipse 50% 60% at 10% 10%, rgba(79, 209, 255, 0.1), transparent);
}

.project-logo {
  display: inline-block;
  background: #fff;
  border-radius: 14px;
  padding: 12px 20px;
  margin-bottom: 24px;
}
.project-logo img { height: 88px; width: auto; display: block; }

.project-hero .breadcrumbs {
  font-size: 0.88rem;
  color: var(--text-faint);
  margin-bottom: 18px;
}
.project-hero .breadcrumbs a { color: var(--text-dim); }

.project-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.project-hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 720px;
}

.meta-row {
  display: flex;
  gap: 34px;
  flex-wrap: wrap;
  margin-top: 34px;
}

.meta-item .meta-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 4px;
}
.meta-item .meta-value { font-size: 0.98rem; color: var(--text); font-weight: 500; }

/* --------------------------- Project page body --------------------------- */

.project-body { padding: 64px 0 90px; }

.project-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 56px;
  align-items: start;
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 64px 0 20px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}
.prose h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }

.prose h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 34px 0 12px;
}

.prose p { color: var(--text-dim); margin-bottom: 20px; font-size: 1.02rem; line-height: 1.8; }

.prose ul { margin: 0 0 20px 22px; color: var(--text-dim); line-height: 1.8; }
.prose li { margin-bottom: 10px; }

.video-embed {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #000;
  margin: 24px 0;
}
.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.video-caption {
  font-size: 0.88rem;
  color: var(--text-faint);
  margin-top: -12px;
  margin-bottom: 24px;
}

.gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 28px 0 34px;
}
.gallery figure {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.gallery figure.wide { grid-column: 1 / -1; }
.gallery img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; background: #fff; }
.gallery figure.panel img { object-fit: contain; background: #11151f; padding: 10px; }
.gallery figcaption {
  padding: 12px 16px;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--text-dim);
}
@media (max-width: 600px) { .gallery { grid-template-columns: 1fr; } }

.steps { counter-reset: step; list-style: none; margin: 20px 0 24px; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 18px 52px;
  color: var(--text-dim);
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent);
  background: rgba(79, 209, 255, 0.1);
  border: 1px solid rgba(79, 209, 255, 0.35);
}
.steps li strong { color: var(--text); display: block; margin-bottom: 2px; }

.partner-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}
.partner-logos a {
  display: inline-block;
  line-height: 0;
  border-radius: 10px;
  transition: opacity 0.2s, box-shadow 0.2s;
}
.partner-logos a:hover { opacity: 0.88; box-shadow: 0 0 0 2px rgba(79, 209, 255, 0.5); text-decoration: none; }

.partner-logos img {
  background: #fff;
  border-radius: 10px;
  padding: 8px 12px;
  height: 62px;
  width: auto;
  object-fit: contain;
}

.factrow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 18px;
  margin: 26px 0 34px;
}
.factrow > div {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
}
.factrow .k {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.factrow .v { font-size: 0.9rem; color: var(--text-dim); line-height: 1.6; }
@media (max-width: 700px) { .factrow { grid-template-columns: 1fr; } }

.callout {
  border-left: 3px solid var(--accent-2);
  background: var(--bg-soft);
  border-radius: 0 10px 10px 0;
  padding: 18px 22px;
  margin: 30px 0 34px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-dim);
}
.callout strong {
  display: block;
  color: var(--text);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 7px;
}

.media-placeholder {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
  padding: 48px 24px;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.95rem;
  margin: 24px 0;
}
.media-placeholder .ph-icon { font-size: 2rem; margin-bottom: 10px; }

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  margin-bottom: 24px;
}

.sidebar-card h3 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 16px;
}

.sidebar-card ul { list-style: none; }
.sidebar-card li {
  padding: 11px 0;
  line-height: 1.6;
  border-bottom: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.95rem;
}
.sidebar-card li:last-child { border-bottom: none; }
.sidebar-card li strong { color: var(--text); font-weight: 600; }
.sidebar-card li a strong { color: inherit; }

/* ------------------------------ About / misc ----------------------------- */

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 26px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.stat-card .icon { font-size: 1.6rem; margin-bottom: 12px; }
.stat-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.stat-card p { color: var(--text-dim); font-size: 0.94rem; }

/* -------------------------------- Footer --------------------------------- */

.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 48px 0 36px;
  color: var(--text-dim);
  font-size: 0.92rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.footer h4 { color: var(--text); font-size: 1rem; margin-bottom: 10px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 6px; }
.footer a { color: var(--text-dim); }
.footer a:hover { color: var(--accent); }

.footer-logo {
  display: inline-block;
  margin-top: 18px;
  line-height: 0;
  opacity: 0.92;
  transition: opacity 0.2s;
}
.footer-logo:hover { opacity: 1; text-decoration: none; }
.footer-logo img { height: 54px; width: auto; display: block; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 22px;
  font-size: 0.85rem;
  color: var(--text-faint);
}

/* ------------------------------- Responsive ------------------------------ */

@media (max-width: 860px) {
  .project-grid { grid-template-columns: 1fr; }
  .hero-content { padding: 80px 0 90px; }
}

@media (max-width: 700px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 13px 24px; }
  .nav-toggle { display: block; }
}