/* ── Base reset & shared variables ────────────────────────────── */
:root {
  --color-bg: #0f1117;
  --color-surface: #1a1d27;
  --color-border: #2a2d3a;
  --color-text: #e4e4e7;
  --color-text-muted: #a1a1aa;
  --color-primary: #6366f1;
  --color-primary-hover: #818cf8;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover {
  color: var(--color-primary-hover);
}

/* ── Utility classes ─────────────────────────────────────────── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  background: var(--color-primary);
  color: #fff;
}
.btn:hover {
  background: var(--color-primary-hover);
}
.btn:active {
  transform: scale(0.97);
}

.text-muted {
  color: var(--color-text-muted);
}