:root {
  --font-body: 'Inter', system-ui, sans-serif;
  --font-display: 'Inter', system-ui, sans-serif;

  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-2: #21262d;
  --color-border: rgba(255,255,255,0.08);
  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-text-faint: #484f58;
  --color-primary: #58a6ff;
  --color-primary-hover: #79c0ff;
  --color-accent: #3fb950;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 20px; --space-6: 24px; --space-8: 32px; --space-10: 40px;
  --space-12: 48px; --space-16: 64px; --space-20: 80px; --space-24: 96px;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);

  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.6);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
h1,h2,h3,h4 { text-wrap: balance; line-height: 1.2; }
p, li { text-wrap: pretty; max-width: 72ch; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-hover); }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }