:root {
    --bg: #ffffff;
    --bg-elev: #f7f7f5;
    --bg-card: #ffffff;
    --bg-subtle: #fafaf8;
    --border: #e4e4df;
    --border-soft: #ededea;
    --text: #0e0e10;
    --text-dim: #555550;
    --text-faint: #8a8a82;
    --accent: #2563eb;
    --accent-hover: #1854d4;
    --accent-soft: #dbeafe;
    --accent-tint: #dbeafe;
    --accent-glow: rgba(37, 99, 235, 0.16);
    --green: #16a34a;
    --orange: #ea580c;
    --purple: #7c3aed;
    --teal: #0d9488;
    --code-bg: #0e0e10;
    --code-bg-soft: #1a1a1d;
    --grid: rgba(0, 0, 0, 0.045);
    --shadow-sm: 0 1px 2px rgba(15,15,20,0.04), 0 1px 3px rgba(15,15,20,0.06);
    --shadow-md: 0 4px 16px -4px rgba(15,15,20,0.08), 0 2px 6px rgba(15,15,20,0.04);
    --shadow-lg: 0 24px 64px -16px rgba(15,15,20,0.18);
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: "Poppins", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(var(--grid) 1px, transparent 1px),
      linear-gradient(90deg, var(--grid) 1px, transparent 1px);
    background-size: 64px 64px;
    pointer-events: none;
    z-index: 0;
    mask-image: radial-gradient(ellipse at top, black 30%, transparent 80%);
  }

  .container { max-width: 1320px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
  code, pre, .mono { font-family: "Poppins", sans-serif; }

  /* NAV */
  nav {
    position: sticky; top: 0; z-index: 50;
    background: rgba(255,255,255,0.78);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-soft);
  }
  .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
  .logo { font-weight: 700; font-size: 17px; letter-spacing: -0.02em; display: flex; align-items: center; gap: 8px; color: var(--text); text-decoration: none; }
  .nav-links { display: flex; gap: 28px; align-items: center; }
  .nav-links a { color: var(--text-dim); text-decoration: none; font-size: 14px; font-weight: 500; transition: color 0.15s; }
  .nav-links a:hover { color: var(--text); }
  .nav-cta { background: var(--text); color: #fff; padding: 8px 16px; border-radius: 8px; font-weight: 600; font-size: 14px; text-decoration: none; transition: transform 0.15s, background 0.15s; }
  .nav-cta:hover { transform: translateY(-1px); background: #2a2a2e; }

  /* HERO */
  .hero { padding: 100px 0 80px; position: relative; }
  .hero::after {
    content: '';
    position: absolute;
    top: 60px; left: 50%; transform: translateX(-50%);
    width: 700px; height: 600px;
    background: radial-gradient(circle, var(--accent-glow), transparent 60%);
    pointer-events: none; z-index: 0; opacity: 0.7;
  }
  .hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr 1fr; gap: 64px; align-items: center; }

  .eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    background: #fff; border: 1px solid var(--border);
    padding: 6px 12px; border-radius: 100px; font-size: 12px;
    color: var(--text-dim); letter-spacing: 0.02em; margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
  }
  .eyebrow .dot { width: 6px; height: 6px; background: var(--green); border-radius: 50%; box-shadow: 0 0 8px var(--green); animation: pulse 2s ease-in-out infinite; }

  h1 { font-size: clamp(40px, 5.5vw, 68px) !important; line-height: 1.02 !important; letter-spacing: -0.035em !important; font-weight: 700 !important; margin-bottom: 20px; color: var(--text) !; }
  h1 .accent { font-style: italic; font-weight: 400 !important; color: var(--accent) !important; letter-spacing: -0.01em; }
  .hero-sub { font-size: 18px; color: var(--text-dim); max-width: 520px; margin-bottom: 36px; line-height: 1.55; }

  .btn-row { display: flex; gap: 12px; flex-wrap: wrap; }
  .btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 22px; border-radius: 10px; font-weight: 600; font-size: 15px; text-decoration: none; transition: transform 0.15s, box-shadow 0.2s, background 0.15s; cursor: pointer; border: none; }
  .btn-primary { background: var(--accent); color: #ffffff; box-shadow: 0 8px 24px -8px var(--accent-glow); }
  .btn-primary:hover { transform: translateY(-1px); background: var(--accent-hover); box-shadow: 0 12px 32px -8px var(--accent-glow); }
  .btn-ghost { background: #ffffff; color: var(--text); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
  .btn-ghost:hover { background: var(--bg-subtle); border-color: #d4d4cf; }

  /* Code card */
  .code-card { background: var(--code-bg); border: 1px solid #2a2a30; border-radius: 14px; overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }
  .code-card::before { content: ''; position: absolute; inset: -1px; border-radius: 14px; background: linear-gradient(135deg, var(--accent-glow), transparent 40%); pointer-events: none; z-index: 0; }
  .code-header { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid #232329; background: #15151a; position: relative; z-index: 1; }
  .code-dots { display: flex; gap: 6px; }
  .code-dots span { width: 11px; height: 11px; border-radius: 50%; background: #2a2a30; }
  .code-title { font-size: 12px; color: #8a8a82; }
  .code-tag { font-size: 11px; color: #fff; background: rgb(37 99 235 / 21%); padding: 3px 8px; border-radius: 4px; }
  pre.code-body { padding: 20px 22px; font-size: 13.5px; line-height: 1.6; overflow-x: auto; position: relative; z-index: 1; color: #e8e8e3; }
  .tk-key { color: #93c5fd; } .tk-str { color: #fbbf77; } .tk-num { color: #c4b5fd; }
  .tk-bool { color: #f472b6; } .tk-com { color: #6b6b66; font-style: italic; }
  .tk-fn { color: var(--accent-soft); } .tk-punct { color: #a0a09a; }

  /* SECTIONS */
  section { padding: 90px 0; position: relative; }
  .section-label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent); margin-bottom: 16px; display: inline-block; }
  h2 { font-size: clamp(32px, 4vw, 48px) !important; line-height: 1.05 !important; letter-spacing: -0.03em !important; font-weight: 700 !important; max-width: 720px !important; margin-bottom: 18px !important; color: var(--text) !important; }
  h2 .accent { font-style: italic !important; font-weight: 400 !important; color: var(--accent) !important; }
  .section-sub { font-size: 17px; color: var(--text-dim); max-width: 620px; margin-bottom: 56px; }

  /* API GROUPS */
  .api-groups { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .api-group-card {
    background: var(--bg-card); border: 1px solid var(--border-soft);
    border-radius: 16px; padding: 28px; box-shadow: var(--shadow-sm);
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
    position: relative; overflow: hidden;
  }
  .api-group-card:hover { border-color: var(--accent-soft); transform: translateY(-3px); box-shadow: var(--shadow-md); }
  .api-group-card .group-icon {
    width: 44px; height: 44px; border-radius: 11px;
    display: grid; place-items: center; margin-bottom: 18px;
    font-size: 20px;
  }
  .group-icon.common { background: #ecfdf5; border: 1px solid #bbf7d0; }
  .group-icon.auth { background: #fef3c7; border: 1px solid #fde68a; }
  .group-icon.gc { background: #dbeafe; border: 1px solid #93c5fd; }
  .group-icon.mp { background: #ede9fe; border: 1px solid #c4b5fd; }
  .group-icon.sub { background: #ffedd5; border: 1px solid #fdba74; }
  .api-group-card h3 { font-size: 17px; font-weight: 600; letter-spacing: -0.015em; margin-bottom: 8px; color: var(--text); }
  .api-group-card p { color: var(--text-dim); font-size: 13.5px; line-height: 1.6; margin-bottom: 16px; }
  .endpoint-list { list-style: none; }
  .endpoint-list li {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 0; border-bottom: 1px dashed var(--border-soft);
    font-size: 12.5px; color: var(--text-dim);
  }
  .endpoint-list li:last-child { border-bottom: none; }
  .method-badge {
    font-size: 10px; font-weight: 700; padding: 2px 6px;
    border-radius: 4px; flex-shrink: 0; letter-spacing: 0.05em;
  }
  .method-post { background: #dbeafe; color: #1d4ed8; }
  .method-get { background: #dcfce7; color: #15803d; }
  .ep-path { font-size: 12px; color: var(--text-faint); }

  /* ENDPOINT OVERVIEW TABLE */
  .endpoint-table-section { background: var(--bg-elev); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
  .endpoint-table-wrap { overflow-x: auto; }
  table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
  thead th { padding: 14px 16px; text-align: left; font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-faint); border-bottom: 1px solid var(--border); background: var(--bg-subtle); }
  tbody tr { border-bottom: 1px solid var(--border-soft); transition: background 0.15s; }
  tbody tr:hover { background: var(--bg-subtle); }
  tbody td { padding: 13px 16px; vertical-align: middle; }
  .tag-pill { display: inline-block; padding: 3px 10px; border-radius: 100px; font-size: 11px; font-weight: 600; }
  .tag-common { background: #ecfdf5; color: #15803d; }
  .tag-auth { background: #fef3c7; color: #92400e; }
  .tag-gc { background: #dbeafe; color: #1d4ed8; }
  .tag-mp { background: #ede9fe; color: #6d28d9; }
  .tag-sub { background: #ffedd5; color: #c2410c; }
  .td-summary { font-weight: 500; color: var(--text); }
  .td-path { font-size: 12px; color: var(--text-faint); }

  /* DOCS */
  .docs-section { background: var(--bg-elev); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
  .docs-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 56px; align-items: center; }
  .docs-feature-list { list-style: none; margin-top: 28px; }
  .docs-feature-list li { display: flex; gap: 14px; align-items: flex-start; padding: 14px 0; border-bottom: 1px solid var(--border-soft); }
  .docs-feature-list li:last-child { border-bottom: none; }
  .docs-feature-list .check { flex-shrink: 0; width: 22px; height: 22px; border-radius: 6px; background: var(--accent-tint); color: var(--accent); display: grid; place-items: center; margin-top: 1px; }
  .docs-feature-list strong { font-weight: 600; display: block; margin-bottom: 2px; color: var(--text); }
  .docs-feature-list span { color: var(--text-dim); font-size: 14px; }

  /* USE CASES */
  .usecase-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .usecase-card { background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: 16px; padding: 32px; display: flex; gap: 22px; transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s; box-shadow: var(--shadow-sm); }
  .usecase-card:hover { border-color: var(--accent-soft); box-shadow: var(--shadow-md); transform: translateY(-2px); }
  .usecase-num { flex-shrink: 0; width: 40px; height: 40px; border-radius: 10px; background: var(--accent-tint); border: 1px solid var(--accent-soft); display: grid; place-items: center; font-weight: 600; color: var(--accent); font-size: 14px; }
  .usecase-card h4 { font-size: 17px; font-weight: 600; margin-bottom: 8px; letter-spacing: -0.01em; color: var(--text); }
  .usecase-card p { color: var(--text-dim); font-size: 14px; line-height: 1.55; }

  /* ROLES */
  .roles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .role-card { background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: 16px; padding: 28px; box-shadow: var(--shadow-sm); transition: transform 0.2s, box-shadow 0.2s; }
  .role-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
  .role-badge { display: inline-block; padding: 5px 14px; border-radius: 100px; font-size: 12px; font-weight: 600; margin-bottom: 16px; }
  .role-card h4 { font-size: 17px; font-weight: 600; margin-bottom: 10px; }
  .role-card ul { list-style: none; }
  .role-card ul li { font-size: 13.5px; color: var(--text-dim); padding: 5px 0; border-bottom: 1px dashed var(--border-soft); display: flex; align-items: center; gap: 8px; }
  .role-card ul li:last-child { border-bottom: none; }
  .role-card ul li::before { content: '→'; color: var(--accent); font-size: 12px; }

  /* LANGUAGES */
  .lang-section { text-align: center; }
  .lang-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; max-width: 900px; margin: 0 auto; }
  .lang-chip { background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: 12px; padding: 24px 12px; text-align: center; transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s; box-shadow: var(--shadow-sm); }
  .lang-chip:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-md); }
  .lang-chip .glyph { font-size: 20px; font-weight: 700; color: var(--accent); margin-bottom: 8px; }
  .lang-chip .name { font-size: 13px; color: var(--text-dim); }

  /* CTA */
  .cta-section { padding: 100px 0; position: relative; }
  .cta-card { background: linear-gradient(180deg, #ffffff, #fafaf8); border: 1px solid var(--border); border-radius: 24px; padding: 72px 56px; text-align: center; position: relative; overflow: hidden; box-shadow: var(--shadow-lg); }
  .cta-card::before { content: ''; position: absolute; top: -50%; left: 50%; transform: translateX(-50%); width: 900px; height: 700px; background: radial-gradient(ellipse, var(--accent-glow), transparent 60%); pointer-events: none; }
  .cta-card > * { position: relative; }
  .cta-card h2 { margin-left: auto; margin-right: auto; }
  .cta-card .section-sub { margin-left: auto; margin-right: auto; margin-bottom: 32px; }
  .cta-card .btn-row { justify-content: center; }

  /* FOOTER */
  /* footer { border-top: 1px solid var(--border-soft); padding: 56px 0 32px; background: var(--bg-elev); }
  .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
  .footer-brand p { color: var(--text-dim); font-size: 14px; max-width: 280px; margin-top: 16px; line-height: 1.55; }
  footer h5 { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-faint); margin-bottom: 18px; }
  footer ul { list-style: none; }
  footer ul li { margin-bottom: 11px; }
  footer ul a { color: var(--text-dim); text-decoration: none; font-size: 14px; transition: color 0.15s; }
  footer ul a:hover { color: var(--accent); }
  .footer-bottom { padding-top: 24px; border-top: 1px solid var(--border-soft); display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--text-faint); }
  .inline-code { font-size: 12.5px; color: var(--accent); background: var(--accent-tint); padding: 1px 6px; border-radius: 4px; border: 1px solid var(--accent-soft); } */

  @media (max-width: 900px) {
    .hero-inner, .docs-grid { grid-template-columns: 1fr; gap: 40px; }
    .api-groups, .roles-grid { grid-template-columns: 1fr; }
    .usecase-grid { grid-template-columns: 1fr; }
    .lang-grid { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .cta-card { padding: 48px 24px; }
    section { padding: 64px 0; }
    .hero { padding: 60px 0 40px; }
    .nav-links { display: none; }
  }

  @keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
  @keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
  pre.code-body .line { display: block; animation: fadeUp 0.4s ease-out backwards; }