@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@300;400;500;700&display=swap');
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --black: #0a0a0a;
  --grey-950: #141414;
  --grey-900: #1a1a1a;
  --grey-800: #262626;
  --grey-700: #404040;
  --grey-600: #525252;
  --grey-500: #737373;
  --grey-400: #a3a3a3;
  --grey-300: #d4d4d4;
  --grey-200: #e5e5e5;
  --grey-100: #f5f5f5;
  --grey-50: #fafafa;
  --white: #ffffff;
  --nav-bg: rgba(255, 255, 255, 0.88);
  --overlay-bg: rgba(255, 255, 255, 0.95);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;
}
[data-theme="dark"] {
  --black: #f5f5f5;
  --grey-950: #141414;
  --grey-900: #1a1a1a;
  --grey-800: #d4d4d4;
  --grey-700: #a3a3a3;
  --grey-600: #a3a3a3;
  --grey-500: #737373;
  --grey-400: #525252;
  --grey-300: #404040;
  --grey-200: #262626;
  --grey-100: #1a1a1a;
  --grey-50: #141414;
  --white: #0a0a0a;
  --nav-bg: rgba(10, 10, 10, 0.88);
  --overlay-bg: rgba(10, 10, 10, 0.95);
}
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--black);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body, nav, footer { transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease; }

/* NAV */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 56px; display: flex; justify-content: space-between; align-items: center;
  padding: 0 48px; background: var(--nav-bg);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--grey-200);
}
nav .logo {
  font-family: var(--font-mono); font-weight: 600; font-size: 15px;
  letter-spacing: -0.02em; color: var(--black); text-decoration: none;
}
nav .links { display: flex; gap: 32px; align-items: center; }
nav .links a {
  color: var(--grey-700); text-decoration: none; font-size: 14px;
  font-weight: 400; transition: color 0.2s;
}
nav .links a:hover { color: var(--black); }

/* LAYOUT */
.container { max-width: 1120px; margin: 0 auto; padding: 0 48px; }
.divider { width: 100%; height: 1px; background: var(--grey-200); }
section { padding: 120px 0; }
.section-label {
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  color: var(--grey-700); letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 16px;
}
section h2 {
  font-size: clamp(28px, 4vw, 42px); font-weight: 700;
  line-height: 1.12; letter-spacing: -0.03em; margin-bottom: 16px;
}
section .lead {
  font-size: 17px; font-weight: 400; color: var(--grey-700);
  max-width: 560px; line-height: 1.7; margin-bottom: 56px;
}

/* BUTTONS */
.btn-primary {
  display: inline-flex; align-items: center; padding: 12px 28px;
  background: var(--black); color: var(--white); font-size: 14px;
  font-weight: 500; text-decoration: none; border-radius: 8px;
  font-family: var(--font-sans); transition: all 0.2s; border: 1px solid var(--black);
}
.btn-primary:hover { background: var(--grey-800); }
.btn-secondary {
  display: inline-flex; align-items: center; padding: 12px 28px;
  background: transparent; color: var(--black); font-size: 14px;
  font-weight: 500; text-decoration: none; border-radius: 8px;
  border: 1px solid var(--grey-300); font-family: var(--font-sans); transition: all 0.2s;
}
.btn-secondary:hover { border-color: var(--black); }
.cta-group { display: flex; gap: 12px; flex-wrap: wrap; }

/* DARK MODE TOGGLE */
.theme-toggle {
  position: relative; width: 44px; height: 24px; background: var(--grey-200);
  border: 1px solid var(--grey-300); border-radius: 100px; cursor: pointer;
  transition: all 0.3s ease; display: flex; align-items: center;
  padding: 0 3px; flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--grey-500); }
.theme-toggle .toggle-thumb {
  width: 18px; height: 18px; background: var(--white); border-radius: 50%;
  transition: all 0.3s ease; display: flex; align-items: center;
  justify-content: center; font-size: 10px; box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}
[data-theme="dark"] .theme-toggle { background: var(--grey-200); }
[data-theme="dark"] .theme-toggle .toggle-thumb { transform: translateX(18px); background: var(--grey-50); }
.toggle-icon-sun, .toggle-icon-moon { pointer-events: none; line-height: 1; }
.toggle-icon-moon { display: none; }
[data-theme="dark"] .toggle-icon-sun { display: none; }
[data-theme="dark"] .toggle-icon-moon { display: block; }

/* FADE */
.fade-in {
  opacity: 0; transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* FOOTER */
footer { padding: 48px 0; border-top: 1px solid var(--grey-200); }
footer .container {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: var(--grey-700);
}
footer a { color: var(--grey-700); text-decoration: none; transition: color 0.2s; }
footer a:hover { color: var(--black); }
footer .footer-links { display: flex; gap: 24px; }

/* STACK GRID */
.stack-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--grey-200); border: 1px solid var(--grey-200);
  border-radius: 12px; overflow: hidden;
}
.stack-card { background: var(--white); padding: 36px; }
.stack-card:hover { background: var(--grey-50); }
.stack-num {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--grey-700); letter-spacing: 0.08em; margin-bottom: 16px;
}
.stack-card h3 { font-size: 22px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 4px; }
.stack-url { font-family: var(--font-mono); font-size: 12px; color: var(--grey-700); margin-bottom: 16px; }
.stack-card p { font-size: 14px; color: var(--grey-700); line-height: 1.65; margin-bottom: 20px; }
.stack-role {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--black); letter-spacing: 0.04em; text-transform: uppercase;
  padding-top: 16px; border-top: 1px solid var(--grey-200);
}

/* STATS ROW */
.stats-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--grey-200); border: 1px solid var(--grey-200);
  border-radius: 12px; overflow: hidden; margin-top: 64px;
}
.stat { background: var(--white); padding: 36px 28px; text-align: center; }
.stat-number {
  font-size: 44px; font-weight: 700; letter-spacing: -0.03em;
  line-height: 1; margin-bottom: 6px; font-family: var(--font-mono);
}
.stat-label { font-size: 13px; color: var(--grey-700); }

/* CODE BLOCK */
.code-block {
  background: var(--grey-950); color: var(--grey-400); padding: 28px;
  border-radius: 12px; font-family: var(--font-mono); font-size: 12px;
  line-height: 1.9; overflow-x: auto;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.08);
}
.code-block .kw { color: var(--white); font-weight: 500; }
.code-block .cm { color: var(--grey-400); }
.code-block .str { color: var(--grey-300); }

/* COMPONENT GRID */
.component-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--grey-200); border: 1px solid var(--grey-200);
  border-radius: 12px; overflow: hidden;
}
.component-card { background: var(--white); padding: 28px; transition: background 0.2s; }
.component-card:hover { background: var(--grey-50); }
.card-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 10px; }
.card-name { font-family: var(--font-mono); font-weight: 600; font-size: 14px; }
.card-badge {
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  color: var(--grey-700); background: var(--grey-100); padding: 3px 10px;
  border-radius: 100px;
}
.card-desc { font-size: 13px; color: var(--grey-700); line-height: 1.55; }

/* VALUE GRID */
.value-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--grey-200); border: 1px solid var(--grey-200);
  border-radius: 12px; overflow: hidden;
}
.value-card { background: var(--white); padding: 32px; }
.value-card h3 { font-size: 16px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 8px; }
.value-card p { font-size: 13px; color: var(--grey-700); line-height: 1.6; }

/* RESPONSIVE — TABLET */
@media (max-width: 960px) {
  nav { padding: 0 24px; }
  .container { padding: 0 24px; }
  section { padding: 80px 0; }
  .stack-grid { grid-template-columns: repeat(2, 1fr); }
  .component-grid { grid-template-columns: repeat(2, 1fr); }
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
}

/* RESPONSIVE — MOBILE */
@media (max-width: 600px) {
  nav { padding: 0 16px; }
  nav .links { gap: 20px; }
  nav .links a { font-size: 13px; }
  .container { padding: 0 16px; }
  section { padding: 56px 0; }
  section h2 { font-size: 26px; }
  section .lead { font-size: 14px; margin-bottom: 32px; }
  .cta-group { flex-direction: column; align-items: stretch; }
  .btn-primary, .btn-secondary { justify-content: center; padding: 14px 24px; font-size: 15px; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 20px 16px; }
  .stat-number { font-size: 28px; }
  .stat-label { font-size: 10px; }
  .stack-grid, .component-grid, .value-grid {
    display: flex; overflow-x: auto; -webkit-overflow-scrolling: touch;
    gap: 12px; background: none; border: none; border-radius: 0;
    padding-bottom: 8px; scroll-snap-type: x mandatory;
  }
  .stack-card, .component-card, .value-card {
    min-width: 280px; max-width: 300px; flex-shrink: 0;
    border: 1px solid var(--grey-200); border-radius: 10px;
    scroll-snap-align: start;
  }
  footer { padding: 32px 0; }
  footer .container { flex-direction: column; gap: 12px; text-align: center; }
  footer .footer-links { justify-content: center; }
}