/* =============================
   DESIGN TOKENS
   ============================= */
:root {
  --bg: #0a0a0a;
  --bg-1: #111111;
  --bg-2: #181818;
  --bg-3: #222222;
  --border: #2a2a2a;
  --border-hover: #404040;
  --text-primary: #f0f0f0;
  --text-secondary: #888888;
  --text-muted: #555555;
  --white: #ffffff;
  --accent: #f0f0f0;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --font: 'Inter', sans-serif;
  --mono: 'JetBrains Mono', monospace;

  --transition: 200ms cubic-bezier(.4,0,.2,1);
}

/* =============================
   RESET & BASE
   ============================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

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

a { color: inherit; text-decoration: none; }

img { display: block; max-width: 100%; }

/* =============================
   NAV
   ============================= */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: 60px;
}

.nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex; align-items: center; gap: 32px;
}

.nav-logo {
  font-size: 18px; font-weight: 700;
  letter-spacing: -0.5px;
}
.logo-bracket { color: var(--text-muted); }

.nav-links {
  display: flex; align-items: center; gap: 24px;
  list-style: none; margin-left: auto;
}

.nav-links a {
  font-size: 14px; color: var(--text-secondary);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--white); }

.nav-btn-gh {
  font-size: 13px !important;
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary) !important;
  transition: border-color var(--transition), background var(--transition) !important;
}
.nav-btn-gh:hover {
  background: var(--bg-2);
  border-color: var(--border-hover);
}

.hamburger {
  display: none;
  flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--text-secondary);
  transition: var(--transition);
}

/* =============================
   HERO
   ============================= */
.hero {
  position: relative;
  padding: 140px 24px 80px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  max-width: 1200px;
  margin: 0 auto;
  align-items: center;
}

.hero-bg-grid {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none; z-index: -1;
}

.hero-badge {
  display: inline-block;
  font-size: 12px; font-family: var(--mono);
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(36px, 5vw, 58px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 20px;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 0%, #888888 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
  line-height: 1.7;
}
.hero-sub strong { color: var(--text-primary); }

.hero-actions {
  display: flex; gap: 12px; margin-bottom: 24px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--white);
  color: #000;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600; font-size: 15px;
  transition: opacity var(--transition), transform var(--transition);
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 500; font-size: 15px;
  transition: border-color var(--transition), color var(--transition);
}
.btn-ghost:hover { border-color: var(--border-hover); color: var(--white); }

.hero-install-row {
  display: flex; align-items: center; gap: 8px;
  flex-wrap: wrap;
}

.install-tab-group {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.install-tab {
  background: none; border: none; cursor: pointer;
  padding: 8px 14px;
  font-family: var(--mono); font-size: 12px;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}
.install-tab.active {
  background: var(--bg-2);
  color: var(--white);
}

.install-code {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
}
.install-code code {
  font-family: var(--mono); font-size: 13px;
  color: var(--text-primary);
}

.copy-btn {
  background: none; border: none; cursor: pointer;
  color: var(--text-muted); padding: 2px;
  transition: color var(--transition);
}
.copy-btn:hover { color: var(--white); }

/* ── Code Window ── */
.hero-code-preview { position: relative; }

.code-window {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0,0,0,0.6);
}

.code-window-bar {
  background: var(--bg-2);
  padding: 12px 16px;
  display: flex; align-items: center; gap: 8px;
  border-bottom: 1px solid var(--border);
}

.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #ffbd2e; }
.dot-g { background: #28ca41; }

.window-title {
  margin-left: 8px;
  font-family: var(--mono); font-size: 12px;
  color: var(--text-muted);
}

.code-block {
  padding: 24px;
  font-family: var(--mono); font-size: 13px;
  line-height: 1.8;
  overflow-x: auto;
}

/* ── Syntax Colors ── */
.c-keyword { color: #c792ea; }
.c-var     { color: #82aaff; }
.c-fn      { color: #82b1ff; }
.c-str     { color: #c3e88d; }
.c-comment { color: #546e7a; font-style: italic; }
.c-op      { color: var(--text-muted); }
.c-prop    { color: #f07178; }
.c-num     { color: #f78c6c; }

/* =============================
   STATS BAR
   ============================= */
.stats-bar {
  display: flex; align-items: center; justify-content: center;
  gap: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-1);
  padding: 32px 24px;
  overflow: hidden;
}

.stat-item {
  display: flex; flex-direction: column; align-items: center;
  flex: 1; max-width: 220px;
}
.stat-num {
  font-size: 40px; font-weight: 800;
  letter-spacing: -2px; color: var(--white);
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-size: 13px; color: var(--text-muted);
  margin-top: 4px; font-weight: 500;
}
.stat-divider {
  width: 1px; height: 48px;
  background: var(--border);
  flex-shrink: 0;
}

/* =============================
   SECTIONS
   ============================= */
.section { padding: 96px 24px; }
.section-dark { background: var(--bg-1); }
.section-cta { padding: 80px 24px; }

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

.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  font-family: var(--mono); font-size: 12px;
  color: var(--text-muted); display: block;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800; letter-spacing: -1.5px;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 16px; color: var(--text-secondary);
  max-width: 520px; margin: 0 auto;
}

/* =============================
   USE CASES GRID
   ============================= */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.usecase-card {
  background: var(--bg-1);
  padding: 32px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
  opacity: 0; transform: translateY(20px);
  animation: fadeUp 0.5s forwards;
}
.usecase-card:hover { background: var(--bg-2); }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.uc-icon-wrap {
  width: 44px; height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  background: var(--bg-2);
}
.uc-icon { width: 22px; height: 22px; color: var(--text-secondary); }

.usecase-card h3 {
  font-size: 17px; font-weight: 700;
  margin-bottom: 10px; letter-spacing: -0.3px;
}
.usecase-card p {
  font-size: 14px; color: var(--text-secondary); line-height: 1.65;
  margin-bottom: 20px;
}

.uc-code-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
}
.uc-code-block pre {
  font-family: var(--mono); font-size: 12px; line-height: 1.7;
  overflow-x: auto;
}

/* =============================
   DEMO GRID
   ============================= */
.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.demo-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}
.demo-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.demo-card-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
}

.demo-card-label { font-size: 13px; font-weight: 600; }

.refresh-btn {
  background: var(--bg-3); border: 1px solid var(--border);
  color: var(--text-secondary); cursor: pointer;
  font-family: var(--mono); font-size: 11px;
  padding: 5px 12px; border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}
.refresh-btn:hover { background: var(--border); color: var(--white); }

.demo-output {
  padding: 16px;
  font-family: var(--mono); font-size: 12px; line-height: 1.7;
  color: var(--text-secondary);
  min-height: 140px; max-height: 200px; overflow-y: auto;
  white-space: pre-wrap; word-break: break-word;
}
.demo-output.loaded { color: var(--text-primary); }

/* =============================
   INSTALL SECTION
   ============================= */
.install-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}

.install-card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: border-color var(--transition);
}
.install-card:hover { border-color: var(--border-hover); }

.install-card-header {
  padding: 20px 24px;
  display: flex; align-items: center; gap: 12px;
  border-bottom: 1px solid var(--border);
}

.lang-badge {
  font-size: 11px; font-weight: 700;
  padding: 4px 10px; border-radius: 100px;
  font-family: var(--mono);
}
.lang-badge.node { background: rgba(104,211,145,0.15); color: #68d391; }
.lang-badge.ts   { background: rgba(74,137,220,0.15);  color: #4a89dc; }
.lang-badge.python { background: rgba(144,187,232,0.15); color: #90bbe8; }

.pkg-name { font-family: var(--mono); font-size: 13px; color: var(--text-muted); }

.code-snippet {
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  background: var(--bg);
}
.code-snippet code { font-family: var(--mono); font-size: 13px; }

.copy-btn-sm {
  background: var(--bg-2); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer;
  font-size: 11px; padding: 4px 10px; border-radius: var(--radius-sm);
  transition: color var(--transition);
}
.copy-btn-sm:hover { color: var(--white); }

.lang-example {
  padding: 20px 24px;
  font-family: var(--mono); font-size: 13px; line-height: 1.8;
}

/* =============================
   CTA SECTION
   ============================= */
.cta-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 32px;
  padding: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: var(--bg-1);
}

.cta-text h2 {
  font-size: 28px; font-weight: 800;
  letter-spacing: -1px; margin-bottom: 8px;
}
.cta-text p { color: var(--text-secondary); font-size: 15px; }

.btn-primary-lg {
  white-space: nowrap;
  background: var(--white); color: #000;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 700; font-size: 15px;
  transition: opacity var(--transition), transform var(--transition);
}
.btn-primary-lg:hover { opacity: 0.88; transform: translateY(-1px); }

/* =============================
   FOOTER
   ============================= */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; gap: 24px;
  flex-wrap: wrap;
}
.footer-logo { font-size: 18px; font-weight: 700; }
.footer-links {
  display: flex; gap: 24px; margin-left: auto;
}
.footer-links a {
  font-size: 13px; color: var(--text-muted);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--white); }
.footer-copy {
  font-size: 13px; color: var(--text-muted);
  width: 100%;
}
.footer-copy a { color: var(--text-secondary); }
.footer-copy a:hover { color: var(--white); }

/* =============================
   RESPONSIVE
   ============================= */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 100px;
  }
  .hero-code-preview { display: none; }
  .install-grid { grid-template-columns: 1fr; }
  .stats-bar { flex-wrap: wrap; gap: 24px; }
  .stat-divider { display: none; }
  .cta-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 600px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: fixed; top: 60px; left: 0; right: 0;
    background: var(--bg-1); border-bottom: 1px solid var(--border);
    padding: 20px 24px; gap: 16px;
  }
  .usecases-grid { grid-template-columns: 1fr; }
  .demo-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; }
  .footer-links { margin-left: 0; }
}

/* =============================
   SCROLLBAR
   ============================= */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }