:root {
  --bg-primary: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F1F5F9;
  --border-color: #E2E8F0;
  
  --accent-blue: #0284C7;
  --accent-blue-hover: #0369A1;
  --accent-amber: #D97706;
  --accent-amber-hover: #B45309;
  --accent-emerald: #059669;
  
  --text-main: #0F172A;
  --text-muted: #475569;
  --text-dim: #64748B;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* Orb colors for light mode */
  --orb-1: rgba(2, 132, 199, 0.12);
  --orb-2: rgba(217, 119, 6, 0.08);
  --orb-3: rgba(5, 150, 105, 0.07);
}

[data-theme="dark"] {
  --bg-primary: #0F172A;
  --bg-surface: #1E293B;
  --bg-card: rgba(30, 41, 59, 0.8);
  --bg-card-hover: #26334D;
  --border-color: rgba(255, 255, 255, 0.1);
  
  --accent-blue: #0EA5E9;
  --accent-blue-hover: #0284C7;
  --accent-amber: #F59E0B;
  --accent-amber-hover: #D97706;
  
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4);

  /* Orb colors for dark mode */
  --orb-1: rgba(14, 165, 233, 0.1);
  --orb-2: rgba(245, 158, 11, 0.07);
  --orb-3: rgba(52, 211, 153, 0.06);
}

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

/* ─── Keyframe Animations ───────────────────────────────────── */
@keyframes orbFloat1 {
  0%   { transform: translate(0, 0) scale(1); }
  33%  { transform: translate(40px, -60px) scale(1.08); }
  66%  { transform: translate(-30px, 30px) scale(0.95); }
  100% { transform: translate(0, 0) scale(1); }
}
@keyframes orbFloat2 {
  0%   { transform: translate(0, 0) scale(1); }
  40%  { transform: translate(-50px, 40px) scale(1.05); }
  70%  { transform: translate(60px, -20px) scale(0.97); }
  100% { transform: translate(0, 0) scale(1); }
}
@keyframes orbFloat3 {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(30px, 50px) scale(1.06); }
  100% { transform: translate(0, 0) scale(1); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.96); }
  to   { opacity: 1; transform: scale(1); }
}

/* ─── Scroll Reveal ─────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
/* Stagger delay helpers */
.reveal-d1 { transition-delay: 0.05s; }
.reveal-d2 { transition-delay: 0.12s; }
.reveal-d3 { transition-delay: 0.19s; }
.reveal-d4 { transition-delay: 0.26s; }
.reveal-d5 { transition-delay: 0.33s; }
.reveal-d6 { transition-delay: 0.40s; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

/* ─── Sine Wave Canvas ──────────────────────────────────────── */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 1;
}

/* ─── Room Card staggered entrance ─────────────────────────── */
.room-card {
  animation: fadeInUp 0.5s cubic-bezier(0.4,0,0.2,1) both;
}
.room-card:nth-child(1) { animation-delay: 0.05s; }
.room-card:nth-child(2) { animation-delay: 0.12s; }
.room-card:nth-child(3) { animation-delay: 0.19s; }
.room-card:nth-child(4) { animation-delay: 0.26s; }
.room-card:nth-child(5) { animation-delay: 0.33s; }
.room-card:nth-child(6) { animation-delay: 0.40s; }

/* Keep soft ambient color wash via orbs but more subtle */
.bg-orbs {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
}

.bg-orb-1 {
  width: 600px;
  height: 600px;
  top: -150px;
  left: -80px;
  background: radial-gradient(circle, var(--orb-1) 0%, transparent 70%);
  animation: orbFloat1 26s ease-in-out infinite;
}

.bg-orb-2 {
  width: 500px;
  height: 500px;
  bottom: 0;
  right: -100px;
  background: radial-gradient(circle, var(--orb-2) 0%, transparent 70%);
  animation: orbFloat2 32s ease-in-out infinite;
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: var(--bg-surface);
  opacity: 0.95;
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.callsign-tag {
  font-family: 'JetBrains Mono', monospace;
  background: rgba(2, 132, 199, 0.1);
  color: var(--accent-blue);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  border: 1px solid rgba(2, 132, 199, 0.2);
}

.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

nav {
  display: flex;
  gap: 0.5rem;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

nav a:hover, nav a.active {
  color: var(--accent-blue);
  background-color: rgba(2, 132, 199, 0.08);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

main {
  flex: 1;
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem 1.5rem;
  position: relative;
  z-index: 1;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 3rem 1rem 3.5rem 1rem;
  max-width: 780px;
  margin: 0 auto;
  animation: fadeInUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(217, 119, 6, 0.1);
  color: var(--accent-amber);
  border: 1px solid rgba(217, 119, 6, 0.2);
  padding: 0.35rem 0.9rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  animation: fadeIn 0.5s ease both;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-badge:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.15);
}

.hero-badge svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  color: var(--text-main);
  animation: fadeInUp 0.7s 0.1s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  font-weight: 400;
  line-height: 1.7;
  animation: fadeInUp 0.7s 0.2s cubic-bezier(0.4, 0, 0.2, 1) both;
}

/* Controls / Filter Bar */
.controls-bar {
  margin-bottom: 2rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
}

.filter-tags {
  display: flex;
  gap: 0.5rem;
}

.filter-tag {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.filter-tag:hover, .filter-tag.active {
  background: var(--accent-blue);
  color: #FFFFFF;
  border-color: var(--accent-blue);
}

/* Section Styling */
.section-title {
  margin-top: 1rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.section-title h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-main);
}

.section-title h2::before {
  display: none;
}

/* Grid for BBB Rooms */
.rooms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.room-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.28s cubic-bezier(0.4,0,0.2,1),
              box-shadow 0.28s cubic-bezier(0.4,0,0.2,1),
              border-color 0.28s ease,
              background-color 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.room-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-blue);
  box-shadow: 0 12px 28px -6px rgba(2, 132, 199, 0.18);
  background: var(--bg-card-hover);
}

.room-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.room-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(2, 132, 199, 0.1);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

.room-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: var(--text-main);
  text-decoration: none;
}

.room-title:hover {
  color: var(--accent-blue);
}

.room-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--accent-amber);
  color: #FFFFFF;
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn-primary:hover::after {
  opacity: 1;
}

.btn-primary:hover {
  background-color: var(--accent-amber-hover);
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.3);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-blue);
  transform: translateY(-1px);
}

/* About Section */
.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 4rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.about-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}


/* ─── Hamburger Button ──────────────────────────────────────── */
.hamburger-btn {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.hamburger-btn:hover {
  border-color: var(--accent-blue);
  background: var(--bg-card-hover);
}

.hamburger-btn span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--text-main);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.2s ease, width 0.2s ease;
  transform-origin: center;
}

.hamburger-btn.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger-btn.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger-btn.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ─── Mobile Nav Panel ──────────────────────────────────────── */
.mobile-nav-panel {
  display: none;
  position: fixed;
  top: 65px;
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  padding: 0.75rem;
  flex-direction: column;
  gap: 0.25rem;
  z-index: 99;
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.mobile-nav-panel.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.mobile-nav-panel a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background 0.2s ease;
}

.mobile-nav-panel a:hover,
.mobile-nav-panel a.active {
  color: var(--accent-blue);
  background: rgba(2, 132, 199, 0.08);
}

@media (max-width: 768px) {
  main {
    padding: 1.5rem 1rem 3rem 1rem;
  }

  .hero {
    padding: 1.5rem 0.5rem 2rem 0.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .rooms-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .about-card {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 1.5rem;
    gap: 1.5rem;
  }

  /* Keep header as single row — no stacking */
  .nav-container {
    flex-direction: row;
    padding: 0.75rem 1rem;
  }

  /* Hide inline desktop nav links */
  .nav-actions nav {
    display: none;
  }

  /* Show hamburger */
  .hamburger-btn {
    display: flex;
  }

  /* Show the panel container */
  .mobile-nav-panel {
    display: flex;
  }
}


.about-avatar {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: transform 0.4s cubic-bezier(0.4,0,0.2,1), box-shadow 0.4s ease;
}

.about-card:hover .about-avatar {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.about-info h3 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.about-callsign {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-blue);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.about-bio {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
}

/* Navigation Quick Links Grid */
.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 3rem;
}

.quick-link-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.quick-link-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Filter tag transitions */
.filter-tag {
  transition: background-color 0.2s ease, color 0.2s ease,
              border-color 0.2s ease, transform 0.2s ease,
              box-shadow 0.2s ease;
}
.filter-tag:hover:not(.active) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.filter-tag.active {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

/* Nav link underline slide effect */
nav a {
  position: relative;
}
nav a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  right: 50%;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 1px;
  transition: left 0.25s ease, right 0.25s ease;
}
nav a:hover::after, nav a.active::after {
  left: 10px;
  right: 10px;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  padding: 2.5rem 1.5rem;
  margin-top: auto;
  animation: fadeIn 0.5s 0.4s ease both;
}

.footer-container {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent-blue);
}

.copyright {
  color: var(--text-dim);
  font-size: 0.875rem;
}