:root{
  /* Colors */
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0b1220;
  --muted: #667085;

  --border: rgba(15, 23, 42, .10);
  --ring: rgba(99, 102, 241, .35); /* indigo */
  --primary: #4f46e5;              /* indigo-600 */
  --danger: #ef4444;

  /* Radius + shadow */
  --r-lg: 18px;
  --r-md: 14px;
  --r-sm: 12px;

  --shadow-sm: 0 8px 18px rgba(15, 23, 42, .08);
  --shadow-md: 0 16px 34px rgba(15, 23, 42, .10);

  /* Typography */
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
}

:root[data-theme="dark"]{
  --bg: #0b1220;
  --card: #0f1a2e;
  --text: #e8eefc;
  --muted: #aab7d6;

  --border: rgba(255,255,255,.10);
  --ring: rgba(99, 102, 241, .40);
  --primary: #6366f1;
  --danger: #fb7185;

  --shadow-sm: 0 10px 24px rgba(0,0,0,.30);
  --shadow-md: 0 20px 48px rgba(0,0,0,.38);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: var(--font);
  background: radial-gradient(1200px 800px at 15% 10%, rgba(79,70,229,.08), transparent 50%),
              radial-gradient(900px 700px at 80% 0%, rgba(16,185,129,.06), transparent 45%),
              var(--bg);
  color: var(--text);
}

h1,h2,h3{ margin:0; letter-spacing: -0.02em; }
h2{ font-size: 20px; }
h3{ font-size: 16px; }
p{ margin:0; }
.muted{ color: var(--muted); }

a{ color: inherit; text-decoration: none; }