:root {
  color-scheme: dark;
  --bg: #070b14;
  --surface: #0e1526;
  --surface-raised: #151f38;
  --card: rgba(15, 23, 42, 0.88);
  --card-hover: rgba(26, 38, 66, 0.95);
  --line: rgba(148, 163, 184, 0.16);
  --line-strong: rgba(148, 163, 184, 0.28);
  --muted: #94a3b8;
  --muted-light: #cbd5e1;
  --text: #f1f5f9;
  --text-dark: #1e293b;
  --cyan: #22d3ee;
  --cyan-glow: rgba(34, 211, 238, 0.25);
  --blue: #4f46e5;
  --blue-hover: #6366f1;
  --green: #10b981;
  --green-bg: rgba(16, 185, 129, 0.15);
  --amber: #f59e0b;
  --amber-bg: rgba(245, 158, 11, 0.15);
  --red: #f43f5e;
  --purple: #a855f7;
  --purple-bg: rgba(168, 85, 247, 0.15);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 25px 60px rgba(0, 0, 0, 0.5);
  
  /* Google Docs Canvas Tokens */
  --doc-paper-bg: #ffffff;
  --doc-paper-text: #1e293b;
  --doc-paper-line: #e2e8f0;
  --doc-paper-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { min-width: 320px; scroll-behavior: smooth; }
body {
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  background-image: 
    radial-gradient(circle at top left, rgba(79, 70, 229, 0.15), transparent 40%),
    radial-gradient(circle at right bottom, rgba(34, 211, 238, 0.08), transparent 35%);
  background-attachment: fixed;
}
button, input, select, textarea { font: inherit; }
.hidden { display: none !important; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; left: 12px; top: -80px; z-index: 1000;
  background: var(--blue); color: #fff; padding: 0.7rem 1.2rem;
  border-radius: var(--radius-sm); font-weight: 600; transition: top 0.2s;
}
.skip-link:focus { top: 12px; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

/* Custom Scrollbars */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: rgba(0, 0, 0, 0.1); }
::-webkit-scrollbar-thumb { background: rgba(148, 163, 184, 0.25); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: rgba(148, 163, 184, 0.45); }