/* CMU March Madness ML - Main Stylesheet */

:root {
  --cmu-red: #c41230;
  --cmu-dark: #1a1a2e;
  --cmu-gold: #f5c518;
  --bg-dark: #0f0f23;
  --bg-card: #16213e;
  --bg-card2: #1a1a2e;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b0;
  --accent-green: #00d4aa;
  --accent-blue: #4facfe;
  --border: #2a2a4a;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Navigation */
nav {
  background: linear-gradient(135deg, var(--cmu-dark), #0d0d1a);
  border-bottom: 2px solid var(--cmu-red);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 20px rgba(196,18,48,0.3);
}

nav .nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
}

nav .logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--cmu-red);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

nav .logo span { color: var(--text-primary); }

nav ul {
  display: flex;
  list-style: none;
  gap: 5px;
}

nav ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.9rem;
  transition: all 0.2s;
}

nav ul li a:hover, nav ul li a.active {
  color: white;
  background: rgba(196,18,48,0.2);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--cmu-dark) 0%, #0a0a1a 100%);
  padding: 80px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(196,18,48,0.1) 0%, transparent 70%);
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 15px;
  background: linear-gradient(135deg, white, var(--cmu-red));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 30px;
  position: relative;
}

.hero-badges {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

.badge {
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.badge-red { background: var(--cmu-red); color: white; }
.badge-outline { border: 1px solid var(--accent-blue); color: var(--accent-blue); }
.badge-green { background: rgba(0,212,170,0.15); border: 1px solid var(--accent-green); color: var(--accent-green); }

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 60px 0; }

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 25px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}

.card h3 {
  font-size: 1.1rem;
  color: var(--accent-blue);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 20px; }

/* Stat tiles */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 15px; margin: 20px 0; }

.stat-tile {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 15px;
  text-align: center;
}

.stat-tile .stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-green);
}

.stat-tile .stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Section titles */
.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: white;
}

.section-title span { color: var(--cmu-red); }

.section-sub {
  color: var(--text-secondary);
  margin-bottom: 35px;
}

/* Tabs */
.tabs { display: flex; gap: 5px; margin-bottom: 20px; }
.tab-btn {
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}
.tab-btn.active, .tab-btn:hover {
  background: var(--cmu-red);
  border-color: var(--cmu-red);
  color: white;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Progress bars */
.progress-bar {
  background: var(--border);
  border-radius: 50px;
  height: 8px;
  overflow: hidden;
  margin: 8px 0;
}

.progress-fill {
  height: 100%;
  border-radius: 50px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  transition: width 1s ease;
}

/* Feature importance table */
table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  text-align: left;
  padding: 10px 15px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td:first-child { color: var(--text-primary); }
td:not(:first-child) { color: var(--accent-green); }

tr:hover td { background: rgba(255,255,255,0.02); }

/* Bracket */
.bracket-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  overflow-x: auto;
  padding: 10px;
}

.round-col { display: flex; flex-direction: column; gap: 8px; }
.round-label { text-align: center; font-size: 0.75rem; color: var(--text-secondary); font-weight: 600; letter-spacing: 0.5px; margin-bottom: 5px; }
.game-card { background: var(--bg-card2); border: 1px solid var(--border); border-radius: 8px; padding: 8px; font-size: 0.75rem; min-height: 60px; }
.game-card .winner { color: var(--accent-green); font-weight: 700; }
.game-card .loser { color: var(--text-secondary); text-decoration: line-through; }
.game-card .seed { color: var(--cmu-red); margin-right: 4px; font-size: 0.65rem; }

/* Chart containers */
.chart-container { position: relative; height: 300px; margin: 15px 0; }

/* Alert boxes */
.info-box {
  background: rgba(79,172,254,0.1);
  border: 1px solid rgba(79,172,254,0.3);
  border-radius: 8px;
  padding: 15px 20px;
  margin: 15px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.info-box strong { color: var(--accent-blue); }

/* Warning and success boxes */
.warn-box {
  background: rgba(245,197,24,0.06);
  border: 1px solid rgba(245,197,24,0.2);
  border-left: 4px solid var(--cmu-gold);
  border-radius: 6px;
  padding: 14px 18px;
  margin: 15px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.warn-box strong { color: var(--cmu-gold); }

.success-box {
  background: rgba(0,212,170,0.06);
  border: 1px solid rgba(0,212,170,0.2);
  border-left: 4px solid var(--accent-green);
  border-radius: 6px;
  padding: 14px 18px;
  margin: 15px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.success-box strong { color: var(--accent-green); }

/* Mobile nav improvements */
@media (max-width: 900px) {
  nav ul { gap: 2px; }
  nav ul li a { padding: 6px 8px; font-size: 0.8rem; }
}

/* Footer */
footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 30px 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

footer a { color: var(--cmu-red); text-decoration: none; }

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  nav ul li a { padding: 6px 10px; font-size: 0.8rem; }
  .grid-2 { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Loading spinner */
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top: 3px solid var(--cmu-red);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Pill buttons */
.btn {
  display: inline-block;
  padding: 10px 25px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary { background: var(--cmu-red); color: white; }
.btn-primary:hover { background: #a50e28; }
.btn-outline { border: 1px solid var(--accent-green); color: var(--accent-green); background: transparent; }
.btn-outline:hover { background: rgba(0,212,170,0.1); }

/* Code blocks */
code {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  color: var(--cmu-gold);
}

pre {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  overflow-x: auto;
  margin: 15px 0;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.6;
}