:root {
  --bg-dark: #090d16;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(28, 38, 58, 0.85);
  --primary: #3b82f6;
  --primary-glow: rgba(59, 130, 246, 0.35);
  --accent: #8b5cf6;
  --accent-glow: rgba(139, 92, 246, 0.3);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --border-color: rgba(255, 255, 255, 0.08);
  --code-bg: #050810;
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

.glow-bg {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 550px;
  background: radial-gradient(circle, var(--primary-glow) 0%, var(--accent-glow) 40%, transparent 70%);
  filter: blur(80px);
  z-index: -1;
  pointer-events: none;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2.5rem;
  backdrop-filter: blur(16px);
  background: rgba(9, 13, 22, 0.7);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #60a5fa, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge {
  background: rgba(59, 130, 246, 0.15);
  color: #93c5fd;
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text-main);
}

.github-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  padding: 0.45rem 1rem;
  border-radius: 8px;
  color: var(--text-main) !important;
  font-weight: 600 !important;
  transition: all 0.2s;
}

.github-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.2);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

.hero {
  text-align: center;
  margin-bottom: 4.5rem;
}

.hero-badge {
  display: inline-block;
  background: rgba(139, 92, 246, 0.15);
  color: #c4b5fd;
  border: 1px solid rgba(139, 92, 246, 0.3);
  padding: 0.35rem 1rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  background: linear-gradient(180deg, #ffffff 30%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.btn {
  padding: 0.8rem 1.75rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.2s;
  display: inline-block;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--primary-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.section {
  margin-bottom: 4.5rem;
}

.section-header {
  margin-bottom: 2rem;
  text-align: center;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1rem;
}

.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.arch-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.75rem;
  transition: all 0.2s;
  backdrop-filter: blur(12px);
}

.arch-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.16);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.arch-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.arch-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  backdrop-filter: blur(16px);
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 1.75rem;
}

.control-group {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.control-group select,
.control-group input[type="range"] {
  background: rgba(0, 0, 0, 0.4);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-family: inherit;
  font-size: 0.9rem;
}

.canvas-container {
  background: var(--code-bg);
  border-radius: 10px;
  border: 1px solid var(--border-color);
  padding: 1rem;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: center;
}

canvas {
  max-width: 100%;
  height: auto;
}

.table-container {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.data-table th,
.data-table td {
  padding: 0.65rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  color: var(--text-muted);
  font-weight: 600;
}

.data-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* RoPE Visualizer */
.rope-visualizer {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.rope-axis-card {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem;
}

.rope-axis-card h4 {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: #93c5fd;
}

.frequencies-bar {
  display: flex;
  gap: 3px;
  height: 90px;
  align-items: flex-end;
}

.freq-bar-col {
  flex: 1;
  background: linear-gradient(180deg, #3b82f6, #8b5cf6);
  border-radius: 2px 2px 0 0;
  transition: height 0.15s ease-out;
}

/* Calc Card */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.calc-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.calc-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.calc-item input,
.calc-item select {
  background: rgba(0, 0, 0, 0.4);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.6rem 0.85rem;
  font-size: 0.95rem;
  font-family: var(--font-mono);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.stat-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem;
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: #60a5fa;
  margin-bottom: 0.35rem;
}

.stat-name {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Code Terminal */
.code-terminal {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

.terminal-bar {
  background: rgba(255, 255, 255, 0.04);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.red { background: #ef4444; }
.yellow { background: #f59e0b; }
.green { background: #10b981; }

.terminal-title {
  margin-left: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.code-terminal pre {
  padding: 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
}

.c { color: #64748b; }
.cmd { color: #60a5fa; font-weight: 600; }
.str { color: #34d399; }

.footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer a {
  color: #60a5fa;
  text-decoration: none;
}