/* =============================================
   UEVR Landing Page — Dark VR Theme
   ============================================= */

:root {
  --bg-primary: #0b0d17;
  --bg-secondary: #111325;
  --bg-card: rgba(255, 255, 255, 0.035);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-hover: rgba(0, 212, 255, 0.35);
  --text-primary: #e8eaed;
  --text-secondary: #9aa0a6;
  --text-muted: #5f6368;
  --accent: #00d4ff;
  --accent-purple: #7c4dff;
  --accent-gradient: linear-gradient(135deg, #00d4ff, #7c4dff);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.3s var(--ease);
}

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

html { scroll-behavior: smooth; }

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

img { display: block; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.22); }

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 85vh;
  text-align: center;
  padding: 6rem 2rem 4rem;
  overflow: hidden;
}

/* Animated ambient glow */
.hero::before {
  content: '';
  position: absolute;
  inset: -50%;
  background:
    radial-gradient(ellipse 600px 400px at 30% 40%, rgba(0,212,255,0.10) 0%, transparent 70%),
    radial-gradient(ellipse 500px 350px at 70% 60%, rgba(124,77,255,0.08) 0%, transparent 70%);
  animation: hero-drift 20s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes hero-drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(-3%, 4%) scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(0,212,255,0.25);
  background: rgba(0,212,255,0.06);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2.5vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

/* Accent text in subtitle */
.accent {
  color: var(--accent);
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-cta-secondary {
  display: flex;
  justify-content: center;
  margin-top: 0.75rem;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  background: rgba(0,212,255,0.15);
  color: var(--accent);
  border: 1.5px solid rgba(0,212,255,0.35);
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 24px rgba(0,212,255,0.15);
}
.btn-primary:hover {
  background: rgba(0,212,255,0.25);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 36px rgba(0,212,255,0.3);
}

.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border: 1.5px solid var(--border-subtle);
  backdrop-filter: blur(12px);
}
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-nightly {
  background: rgba(124,77,255,0.15);
  color: #b794ff;
  border: 1.5px solid rgba(124,77,255,0.35);
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 24px rgba(124,77,255,0.15);
}
.btn-nightly:hover {
  background: rgba(124,77,255,0.25);
  border-color: #b794ff;
  transform: translateY(-2px);
  box-shadow: 0 8px 36px rgba(124,77,255,0.3);
}

.btn-donate {
  background: rgba(255,120,90,0.12);
  color: #f0967a;
  border: 1.5px solid rgba(255,120,90,0.3);
  backdrop-filter: blur(12px);
  padding: 0.6rem 1.6rem;
  font-size: 0.85rem;
  box-shadow: 0 4px 24px rgba(255,120,90,0.12);
}
.btn-donate svg {
  width: 14px;
  height: 14px;
}
.btn-donate:hover {
  background: rgba(255,120,90,0.22);
  border-color: #f0967a;
  transform: translateY(-2px);
  box-shadow: 0 8px 36px rgba(255,120,90,0.25);
}

/* =============================================
   NAV BAR
   ============================================= */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,13,23,0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-links {
  display: flex;
  justify-content: center;
  max-width: 720px;
  margin: 0 auto;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 1rem 1.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color var(--transition);
  background: none;
  border: none;
}
.nav-link:hover { color: var(--accent); }

.nav-link-inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  padding: 0;
  color: inherit;
}

.nav-links img {
  width: 1.15rem;
  height: 1.15rem;
  filter: brightness(0) invert(1);
  opacity: 0.55;
  transition: opacity var(--transition);
}
.nav-link:hover img { opacity: 0.9; }

/* =============================================
   SECTIONS
   ============================================= */
.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section + .section {
  padding-top: 0;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 2.5rem;
  color: var(--text-primary);
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--accent-gradient);
  margin: 0.7rem auto 0;
  border-radius: 2px;
}

/* =============================================
   FEATURE GRID
   ============================================= */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.feature-box {
  position: relative;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  transition: all var(--transition);
  overflow: hidden;
}

/* Gradient accent line at top */
.feature-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}

.feature-box:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(0,212,255,0.08);
}
.feature-box:hover::before { transform: scaleX(1); }

.feature-box h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.feature-box p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin: 0;
}

/* Expand indicator (chevron) */
.feature-expand {
  display: block;
  text-align: center;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.feature-expand::after {
  content: '\25BE';
  display: inline-block;
  transition: transform var(--transition), color var(--transition);
}
.feature-box:hover .feature-expand { color: var(--accent); }
.feature-box:hover .feature-expand::after { transform: rotate(180deg); }

/* Expandable info panel */
.feature-more-info {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s var(--ease);
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  background: none;
  padding: 0;
}

.feature-box:hover .feature-more-info {
  max-height: 3000px;
}

.feature-more-info img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin: 0.75rem 0;
}

.feature-more-info h3 {
  margin-top: 1rem;
  font-size: 0.95rem;
  color: var(--accent);
}

.feature-more-info ul {
  padding-left: 1.25rem;
  margin: 0.5rem 0;
}

.feature-more-info li {
  margin-bottom: 0.2rem;
}

.feature-more-info strong {
  color: var(--text-primary);
}

/* =============================================
   LINK BOXES
   ============================================= */
.link-boxes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.link-box {
  border-radius: var(--radius);
}

.link-box a {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  text-decoration: none;
  transition: all var(--transition);
  height: 100%;
}

.link-box a:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.box-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
  background: none;
  padding: 0;
  color: inherit;
}

.box-inner img {
  width: 2.25rem;
  height: 2.25rem;
  margin-bottom: 0.5rem;
  filter: brightness(0) invert(1);
  opacity: 0.75;
  transition: opacity var(--transition);
}
.link-box a:hover .box-inner img { opacity: 1; }

.box-inner h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.box-inner h4 {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* =============================================
   SINGLE BOXES (Technical)
   ============================================= */
.single-boxes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.single-box a {
  display: block;
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  text-decoration: none;
  transition: all var(--transition);
  text-align: center;
}

.single-box a:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.single-box .box-inner { align-items: center; }
.single-box .box-inner img { width: 2.5rem; height: 2.5rem; }

.single-box h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.single-box h3 {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-secondary);
}

/* =============================================
   DIVIDERS
   ============================================= */
hr {
  border: none;
  height: 1px;
  background: var(--border-subtle);
  margin: 0;
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  text-align: center;
  padding: 3rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.site-footer h2 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
}

.site-footer p {
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

.copyright {
  margin-top: 1.5rem;
  color: var(--text-muted);
}

/* =============================================
   STATS ROW (between hero & features)
   ============================================= */
.stats-row {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  padding: 2rem 2rem 0;
  max-width: 900px;
  margin: 0 auto;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
  .hero {
    min-height: 65vh;
    padding: 4rem 1.5rem 3rem;
  }

  .hero-badge { font-size: 0.7rem; }

  .nav-links { flex-wrap: wrap; }
  .nav-link { padding: 0.7rem 1rem; font-size: 0.8rem; }
  .nav-links img { width: 1rem; height: 1rem; }

  .section { padding: 3rem 1.25rem; }
  .section + .section { padding-top: 0; }

  .feature-grid { grid-template-columns: 1fr; }
  .link-boxes { grid-template-columns: 1fr; }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn { width: 100%; max-width: 280px; justify-content: center; }

  .stats-row { gap: 2rem; }
  .stat-value { font-size: 1.4rem; }
}

@media (max-width: 480px) {
  .hero { min-height: 55vh; padding: 3rem 1rem 2rem; }
  .hero-subtitle { font-size: 0.95rem; }
  .section { padding: 2rem 1rem; }
  .feature-box { padding: 1.25rem; }
  .link-box a { padding: 1.25rem; }
  .nav-link { padding: 0.6rem 0.75rem; font-size: 0.75rem; }
}