:root{
    --bg:#F7F7F5;
    --surface:#FFFFFF;
    --ink:#14181F;
    --ink-soft:#5B6470;
    --ink-faint:#9AA2AC;
    --line:#E2E5E7;
    --accent:#2F5D8A;
    --accent-ink:#1F4166;
    --accent-soft:#E9F0F6;
    --amber:#E8A33D;
    --amber-soft:#FBF0DD;
    --success:#3F8F6C;
    --danger:#C1543C;
    --radius-sm:8px;
    --radius:12px;
    --radius-lg:18px;
    --shadow:0 1px 2px rgba(20,24,31,0.04), 0 8px 24px -12px rgba(20,24,31,0.12);
    --font-display:'Space Grotesk', sans-serif;
    --font-body:'Inter', sans-serif;
    --font-mono:'JetBrains Mono', monospace;
    --panel-dark:#14181F;
    --topbar-bg:rgba(247,247,245,0.82);
    color-scheme:light;
    transition:background .2s ease, color .2s ease;
  }
  [data-theme="dark"]{
    --bg:#14171C;
    --surface:#1B1F26;
    --ink:#EDEFF2;
    --ink-soft:#A6ADB8;
    --ink-faint:#6E7683;
    --line:#2B3038;
    --accent:#5B9BD9;
    --accent-ink:#8FC0EC;
    --accent-soft:#1F2A36;
    --amber:#E8A33D;
    --amber-soft:#2E2717;
    --success:#4FAE85;
    --danger:#D97159;
    --shadow:0 1px 2px rgba(0,0,0,0.3), 0 8px 24px -12px rgba(0,0,0,0.5);
    --panel-dark:#0F1216;
    --topbar-bg:rgba(20,23,28,0.82);
    color-scheme:dark;
  }
  *{box-sizing:border-box; -webkit-tap-highlight-color:transparent;}
  html{scroll-behavior:smooth; -webkit-text-size-adjust:100%; text-size-adjust:100%;}
  body{
    margin:0; background:var(--bg); color:var(--ink);
    font-family:var(--font-body); line-height:1.5;
    -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale; overflow-x:hidden;
    padding-left:env(safe-area-inset-left); padding-right:env(safe-area-inset-right);
  }
  button, a, .theme-toggle{ touch-action:manipulation; }
  button, .theme-toggle{ -webkit-user-select:none; user-select:none; }
  .grid-bg{
    position:fixed; inset:0; z-index:0; pointer-events:none;
    background-image:
      linear-gradient(var(--line) 1px, transparent 1px),
      linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size:40px 40px; opacity:0.45;
    mask-image:radial-gradient(ellipse 80% 50% at 50% 0%, black 40%, transparent 90%);
  }
  a{color:inherit;}
  button{font-family:inherit;}
  h1,h2,h3,.font-display{font-family:var(--font-display);letter-spacing:-0.01em;}

  .topbar{
    position:sticky; top:0; z-index:20;
    display:flex; align-items:center; justify-content:space-between;
    padding:18px 32px; background:var(--topbar-bg); -webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  .logo{
    display:flex; align-items:center; gap:8px;
    font-family:var(--font-display); font-weight:700; font-size:20px;
    text-decoration:none; cursor:pointer;
  }
  .logo-mark{
    width:26px; height:26px; border-radius:7px;
    background:linear-gradient(135deg, var(--accent) 0%, var(--accent-ink) 100%); color:#fff;
    display:flex; align-items:center; justify-content:center;
    font-family:var(--font-mono); font-size:14px; font-weight:700;
    box-shadow:0 2px 6px -1px rgba(20,24,31,0.25);
  }
  .logo-mark svg{width:60%; height:60%;}
  .theme-toggle{
    display:flex; align-items:center; justify-content:center;
    width:36px; height:36px; border-radius:999px;
    border:1px solid var(--line); background:var(--surface); color:var(--ink-soft);
    cursor:pointer; transition:background .15s ease, color .15s ease, border-color .15s ease;
    flex:none;
  }
  .theme-toggle:hover{color:var(--accent-ink); border-color:var(--accent); background:var(--accent-soft);}

  main{position:relative; z-index:1; max-width:1120px; margin:0 auto; padding:0 32px 80px;}

  .page-content{padding:56px 0 24px; max-width:76ch;}
  .page-content .eyebrow{
    font-family:var(--font-mono); font-size:12px; letter-spacing:0.08em; text-transform:uppercase;
    color:var(--accent-ink); background:var(--accent-soft);
    display:inline-block; padding:5px 10px; border-radius:6px; margin-bottom:18px;
  }
  .page-content h1{font-size:36px; line-height:1.1; margin:0 0 14px; font-weight:700;}
  .page-content .lead{color:var(--ink-soft); font-size:16px; margin:0 0 8px;}
  .page-content .updated{font-family:var(--font-mono); font-size:12px; color:var(--ink-faint); margin:0 0 36px;}
  .page-content h2{font-size:20px; margin:32px 0 10px;}
  .page-content p{color:var(--ink-soft); font-size:15px; line-height:1.75; margin:0 0 14px;}
  .page-content ul{color:var(--ink-soft); font-size:15px; line-height:1.75; margin:0 0 14px; padding-left:20px;}
  .page-content li{margin-bottom:6px;}
  .page-content a{color:var(--accent-ink); font-weight:600; text-decoration:underline; text-underline-offset:2px; cursor:pointer;}
  .page-content a:hover{color:var(--accent);}
  .page-content strong{color:var(--ink);}

  .contact-card{
    display:flex; align-items:center; gap:16px; flex-wrap:wrap;
    background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-lg);
    padding:22px 26px; margin:8px 0 28px;
  }
  .contact-card .icon{
    width:44px; height:44px; flex:none; border-radius:10px;
    background:var(--accent-soft); color:var(--accent-ink);
    display:flex; align-items:center; justify-content:center;
  }
  .contact-card .label{font-size:11px; text-transform:uppercase; letter-spacing:.08em; color:var(--ink-soft); font-family:var(--font-mono); font-weight:600; margin-bottom:4px;}
  .contact-card .value{font-size:16px; font-weight:600;}
  .contact-card a.value{text-decoration:none; color:var(--accent-ink);}
  .contact-card a.value:hover{color:var(--accent);}

  footer{
    position:relative; z-index:1;
    border-top:1px solid var(--line); padding:40px 32px 24px; margin-top:40px;
    font-size:13px; color:var(--ink-faint);
  }
  .footer-inner{max-width:1120px; margin:0 auto;}
  .footer-top{
    display:flex; justify-content:space-between; align-items:flex-start; gap:32px;
    padding-bottom:24px; margin-bottom:20px; border-bottom:1px solid var(--line);
    flex-wrap:wrap;
  }
  .footer-brand .logo{margin-bottom:8px;}
  .footer-brand p{margin:0; font-size:13px; color:var(--ink-faint); max-width:32ch; line-height:1.6;}
  .footer-links{display:flex; gap:24px; flex-wrap:wrap;}
  .footer-links a{font-size:13px; font-weight:500; color:var(--ink-soft); text-decoration:none; cursor:pointer;}
  .footer-links a:hover{color:var(--accent-ink); text-decoration:underline; text-underline-offset:3px;}
  .footer-bottom{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:8px;}

  @media (max-width:640px){
    .topbar{padding:14px 16px;}
    .theme-toggle{width:40px; height:40px;}
    main{padding:0 16px 60px;}
    .page-content{padding:32px 0 16px;}
    .page-content h1{font-size:26px;}
    footer{padding:28px 16px 20px;}
    .footer-top{flex-direction:column; gap:20px; text-align:center;}
    .footer-brand p{max-width:none;}
    .footer-links{justify-content:center; gap:16px 20px;}
    .footer-bottom{flex-direction:column; gap:6px; text-align:center;}
    .contact-card{flex-direction:column; text-align:center;}
  }
  @media (prefers-reduced-motion: reduce){ *{animation:none !important; transition:none !important;} }