/* Dark theme - Photonics Report */
:root {
  --bg-primary: #0a0a0f;
  --bg-card: #12121a;
  --bg-card-hover: #1a1a2e;
  --border: #2a2a3e;
  --text-primary: #e8e8f0;
  --text-secondary: #9999b3;
  --accent-cyan: #00d4ff;
  --accent-purple: #a855f7;
  --accent-green: #22d3a8;
  --accent-orange: #fb923c;
  --accent-pink: #f472b6;
  --accent-yellow: #fbbf24;
  --accent-red: #ef4444;
  --gradient-1: linear-gradient(135deg, #00d4ff, #a855f7);
  --gradient-2: linear-gradient(135deg, #22d3a8, #00d4ff);
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.7;
  min-height: 100vh;
}

/* Navigation */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,15,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}
nav ul {
  display: flex; list-style: none;
  max-width: 1200px; margin: 0 auto;
  gap: 0.5rem;
}
nav a {
  display: block; padding: 1rem 1.2rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem; font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
nav a:hover, nav a.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

/* Home link pinned to right side of nav */
nav li.nav-home {
  margin-left: auto;
}
nav li.nav-home a {
  color: var(--accent-cyan);
  font-weight: 600;
}
nav li.nav-home a:hover {
  color: var(--accent-purple);
  border-bottom-color: var(--accent-purple);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(180deg, rgba(0,212,255,0.06) 0%, transparent 100%);
}
.hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.8rem;
}
.hero .subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}
.hero .date {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  opacity: 0.7;
}

/* Section headers */
.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2.5rem 0 1.2rem;
  padding-left: 0.8rem;
  border-left: 3px solid var(--accent-cyan);
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.2s;
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}
.card .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.4rem;
}
.card .value {
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.card .note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
}

/* Chart container */
.chart-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.chart-box h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}
.chart-box canvas {
  max-height: 360px;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}
th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
th {
  color: var(--accent-cyan);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
tr:hover td { background: rgba(0,212,255,0.04); }

/* Tag/Badge */
.tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.tag.green { background: rgba(34,211,168,0.15); color: var(--accent-green); }
.tag.orange { background: rgba(251,146,60,0.15); color: var(--accent-orange); }
.tag.purple { background: rgba(168,85,247,0.15); color: var(--accent-purple); }
.tag.cyan { background: rgba(0,212,255,0.15); color: var(--accent-cyan); }

/* Prose content */
.prose {
  color: var(--text-secondary);
  line-height: 1.9;
  font-size: 0.95rem;
}
.prose p { margin-bottom: 1rem; }
.prose strong { color: var(--text-primary); }
.prose ul { padding-left: 1.5rem; margin-bottom: 1rem; }
.prose li { margin-bottom: 0.4rem; }

/* Comparison table highlight */
.compare-row td:first-child {
  font-weight: 600;
  color: var(--accent-cyan);
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.6rem; }
  .container { padding: 1rem; }
  nav ul { overflow-x: auto; }
  nav a { padding: 0.8rem; font-size: 0.8rem; white-space: nowrap; }
  .card .value { font-size: 1.4rem; }
}