:root {
  --bg: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2128;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-glow: rgba(88, 166, 255, 0.15);
  --green: #3fb950;
  --purple: #bc8cff;
  --orange: #ffa657;
  --red: #ff7b72;
  --snow: #cae8ff;
  --radius: 8px;
  --radius-lg: 16px;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-hover);
}

/* ── Nav ─────────────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.nav-logo svg {
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

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

.nav-cta {
  background: var(--accent);
  color: #000 !important;
  padding: 6px 16px;
  border-radius: var(--radius);
  font-weight: 600 !important;
  transition: background 0.2s !important;
}

.nav-cta:hover {
  background: var(--accent-hover) !important;
  color: #000 !important;
}

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  padding: 140px 24px 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(88, 166, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.hero-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--snow) 0%, var(--accent) 50%, var(--purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius);
  transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #000;
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: border-color 0.2s, transform 0.1s;
}

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

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Section layout ──────────────────────────────────────────── */
section {
  padding: 80px 24px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
}

/* ── Platforms ───────────────────────────────────────────────── */
#platforms {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin-top: 48px;
}

.platform-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
}

.platform-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.platform-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.platform-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.platform-status {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ── Features ────────────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: var(--accent);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.feature-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Code examples ───────────────────────────────────────────── */
#examples {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.examples-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  margin-top: 48px;
}

@media (max-width: 768px) {
  .examples-layout {
    grid-template-columns: 1fr;
  }
}

.example-tabs {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

@media (max-width: 768px) {
  .example-tabs {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

.example-tab {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 16px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
  font-family: inherit;
}

.example-tab:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.example-tab.active {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.code-window {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-window-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.window-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green { background: #28c840; }

.window-title {
  margin-left: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.code-panel {
  display: none;
  padding: 24px;
  overflow-x: auto;
}

.code-panel.active {
  display: block;
}

pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--text-primary);
}

/* ── Rust syntax highlighting ────────────────────────────────── */
.kw   { color: var(--red); }
.ty   { color: var(--orange); }
.mac  { color: var(--purple); }
.str  { color: var(--green); }
.cmt  { color: var(--text-muted); font-style: italic; }
.num  { color: var(--orange); }
.attr { color: var(--purple); }
.fn-name { color: var(--accent); }

/* ── Philosophy ──────────────────────────────────────────────── */
.philosophy-block {
  max-width: 780px;
  margin: 48px auto 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  text-align: center;
}

.philosophy-quote {
  font-size: 1.4rem;
  font-style: italic;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.philosophy-attr {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ── CTA ─────────────────────────────────────────────────────── */
#cta {
  text-align: center;
}

.cta-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(88, 166, 255, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.cta-box h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-box p {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.cta-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 40px 24px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
  width: 100%;
  text-align: center;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* ── Scroll entrance animation ───────────────────────────────── */
.animate-on-scroll {
  opacity: 0;
  transition: opacity 0.5s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
}

/* ── Divider ─────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 0 24px;
}

/* ── Snowflake animation ─────────────────────────────────────── */
.snowflakes {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

.snowflake {
  position: absolute;
  top: -20px;
  color: rgba(202, 232, 255, 0.25);
  font-size: 1rem;
  animation: fall linear infinite;
  user-select: none;
}

@keyframes fall {
  to { transform: translateY(120vh) rotate(360deg); opacity: 0; }
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 600px) {
  .nav-links { display: none; }
  .hero { padding: 100px 16px 60px; }
  .hero-stats { gap: 28px; }
  section { padding: 60px 16px; }
  .cta-box { padding: 40px 20px; }
}