:root {
  /* fonts */
  --font-sans: Inter, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  /* font sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: clamp(1.75rem, 3vw, 2.75rem);
  --text-3xl: clamp(3rem, 7vw, 6.25rem);

  /* spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 2rem;
  --space-8: 2.5rem;
  --space-9: 3rem;
  --space-10: 4rem;
  --space-11: 5rem;

  /* sizes */
  --container: 1280px;
  --header-height: 82px;

  /* radius */
  --radius-sm: 16px;
  --radius-md: 22px;
  --radius-lg: 30px;
  --radius-pill: 999px;

  /* colors aligned with minecraft portal */
  --bg: #03050a;
  --bg-deep: #08101a;
  --surface: rgba(13, 23, 39, 0.8);
  --surface-strong: rgba(9, 17, 31, 0.98);
  --surface-soft: rgba(255, 255, 255, 0.04);
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);
  --surface-border: rgba(45, 212, 191, 0.14);
  --surface-border-hover: rgba(45, 212, 191, 0.28);
  --text: #f5f7fb;
  --muted: #9fb0c8;
  --muted-strong: #d7e4f8;
  --accent: #4fd1c5;
  --accent-2: #4f8cff;
  --accent-3: #34d399;
  --accent-4: #a855f7;
  --warning: #f4a727;
  --danger: #fb7185;

  /* shadows */
  --shadow-card: 0 24px 70px rgba(0, 0, 0, 0.42);
  --shadow-glow: 0 16px 38px rgba(45, 212, 191, 0.18);
  --shadow-surface: 0 0 32px rgba(45, 212, 191, 0.06);

  /* glass buttons (AI-portal style — gold rim, dark glass) */
  --btn-border: rgba(197, 160, 89, 0.48);
  --btn-border-hover: rgba(224, 183, 109, 0.72);
  --btn-bg: linear-gradient(135deg, rgba(45, 212, 191, 0.1), rgba(168, 85, 247, 0.08));
  --btn-bg-hover: linear-gradient(135deg, rgba(45, 212, 191, 0.16), rgba(56, 189, 248, 0.1), rgba(168, 85, 247, 0.12));
  --btn-bg-ghost: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.015));
  --btn-bg-primary: linear-gradient(135deg, rgba(45, 212, 191, 0.2), rgba(56, 189, 248, 0.12), rgba(168, 85, 247, 0.1));
  --btn-bg-primary-hover: linear-gradient(135deg, rgba(45, 212, 191, 0.28), rgba(56, 189, 248, 0.16), rgba(168, 85, 247, 0.14));
  --btn-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --btn-shadow-hover: 0 0 22px rgba(45, 212, 191, 0.14), inset 0 1px 0 rgba(255, 255, 255, 0.08);

  /* motion */
  --ease: 0.24s ease;
}