:root {
  --primary-color: #00f2fe;
  --secondary-color: #3b82f6;
  --accent-color: #38bdf8;
  --bg-color: #0b0f19;
  --card-bg: #151c2c;
  --card-border: #1e293b;
  --text-color: #f1f5f9;
  --text-muted: #94a3b8;
  --border-color: #1e293b;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

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

header {
  background: linear-gradient(135deg, #0b0f19 0%, #1e1b4b 50%, #0f172a 100%);
  color: white;
  padding: 2.5rem 2rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  border-bottom: 2px solid rgba(0, 242, 254, 0.3);
}

header h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  font-weight: 800;
  background: linear-gradient(90deg, #ffffff, #38bdf8, #00f2fe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
  color: #cbd5e1;
  max-width: 900px;
}

.hub-banner {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.4rem 1rem;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.4);
  border-radius: 20px;
  color: #38bdf8;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.hub-banner:hover {
  background: rgba(0, 242, 254, 0.25);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.4);
  color: #ffffff;
}

nav {
  background-color: #070a12;
  display: flex;
  padding: 0 2rem;
  gap: 1.5rem;
  overflow-x: auto;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid #1e293b;
}

nav a {
  color: #94a3b8;
  text-decoration: none;
  padding: 1rem 0.5rem;
  font-weight: 600;
  border-bottom: 3px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}

nav a:hover, nav a.active {
  color: #00f2fe;
  border-bottom-color: #00f2fe;
}

nav a.hub-link {
  color: #38bdf8;
  font-weight: 700;
  margin-left: auto;
  border-bottom: none;
}

nav a.hub-link:hover {
  color: #ffffff;
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.8);
}

.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.card {
  background-color: var(--card-bg);
  border-radius: 10px;
  padding: 1.8rem;
  margin-bottom: 2rem;
  border: 1px solid var(--card-border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.card h2, .card h3 {
  color: #38bdf8;
  margin-bottom: 1rem;
  font-size: 1.5rem;
  border-bottom: 1px solid #1e293b;
  padding-bottom: 0.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.stat-box {
  background: #0f172a;
  border-left: 4px solid #38bdf8;
  padding: 1.2rem;
  border-radius: 6px;
  border: 1px solid #1e293b;
}

.stat-box .number {
  font-size: 2rem;
  font-weight: 800;
  color: #00f2fe;
}

.stat-box .label {
  font-size: 0.9rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Tabs */
.tab-container {
  margin-top: 1.5rem;
}

.tab-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.tab-btn {
  background: #0f172a;
  border: 1px solid #1e293b;
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 6px 6px 0 0;
}

.tab-btn.active {
  background-color: var(--secondary-color);
  color: white;
  border-color: var(--secondary-color);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Figure gallery */
.figure-card {
  background: #151c2c;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 2rem;
}

.figure-card img {
  width: 100%;
  height: auto;
  display: block;
  border-bottom: 1px solid var(--border-color);
}

.figure-caption {
  padding: 1.2rem;
}

.figure-caption h4 {
  color: #38bdf8;
  margin-bottom: 0.4rem;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: #0f172a;
  color: #38bdf8;
  font-weight: 700;
}

tr:hover {
  background-color: rgba(56, 189, 248, 0.05);
}

.spotlight-card {
  background: #0f172a !important;
  border-left: 5px solid #00f2fe !important;
  border: 1px solid #1e293b;
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border-color);
  margin-top: 3rem;
  background: #070a12;
}

footer a {
  color: #38bdf8;
  text-decoration: none;
}