/* Design Tokens */
:root {
  --bg: #0b1220;
  --bg-soft: #0f172a;
  --surface: #0b1220;
  --card: #111827;
  --primary: #0ea5e9;
  --primary-600: #0284c7;
  --border: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --success: #22c55e;
  --danger: #ef4444;
  --shadow: rgba(0,0,0,0.3);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8fafc;
    --bg-soft: #f1f5f9;
    --surface: #ffffff;
    --card: #ffffff;
    --primary: #0ea5e9;
    --primary-600: #0284c7;
    --border: #e5e7eb;
    --text: #0f172a;
    --muted: #475569;
    --shadow: rgba(2,6,23,0.08);
  }
}

/* Base */
html, body { height: 100%; }
body { background: var(--bg); color: var(--text); font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji"; }
* { box-sizing: border-box; }

/* Accessible focus */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }

/* Skip link */
.skip-link { position: absolute; left: -10000px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.skip-link:focus { left: 1rem; top: 1rem; width: auto; height: auto; background: var(--primary); color: white; padding: .5rem .75rem; border-radius: .5rem; box-shadow: 0 10px 20px var(--shadow); }

/* Layout helpers */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1rem; }
.grid { display: grid; gap: 1.25rem; }
.grid-3 { grid-template-columns: 1fr; }
@media (min-width: 900px) { .grid-3 { grid-template-columns: 2fr 1fr; } }

/* Header/Nav */
.header { position: sticky; top: 0; z-index: 50; background: var(--surface); border-bottom: 1px solid var(--border); backdrop-filter: saturate(180%) blur(6px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: .9rem 0; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; letter-spacing: .2px; }
.brand .logo { width: 28px; height: 28px; border-radius: 6px; background: linear-gradient(135deg, var(--primary), var(--primary-600)); display: inline-block; box-shadow: 0 6px 20px var(--shadow); }
.nav { display: flex; gap: .8rem; }
.nav a { color: var(--muted); text-decoration: none; padding: .4rem .6rem; border-radius: .4rem; }
.nav a[aria-current="page"], .nav a:hover { color: var(--text); background: var(--bg-soft); }

/* Cards */
.card { background: var(--card); border: 1px solid var(--border); border-radius: .8rem; box-shadow: 0 10px 30px var(--shadow); }
.card-body { padding: 1rem; }
.card h2, .card h3 { margin: 0 0 .5rem; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; padding: .6rem .9rem; border-radius: .6rem; border: 1px solid transparent; cursor: pointer; font-weight: 600; transition: transform .08s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease; box-shadow: 0 2px 8px var(--shadow); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-600); }
.btn-outline { background: transparent; border-color: var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg-soft); }

/* Forms */
.input, .textarea, .select { width: 100%; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: .6rem; padding: .6rem .75rem; transition: border-color .2s ease, box-shadow .2s ease; }
.input:focus, .textarea:focus, .select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in oklab, var(--primary) 35%, transparent); }
.textarea { min-height: 110px; resize: vertical; }
.form-row { display: grid; gap: .6rem; }
.form-row + .form-row { margin-top: .6rem; }
.form-help { color: var(--muted); font-size: .85rem; }

/* Metrics/Badges */
.badge { display: inline-block; padding: .2rem .5rem; border-radius: .5rem; background: var(--bg-soft); color: var(--muted); font-weight: 600; font-size: .8rem; border: 1px solid var(--border); }
.kv { display: grid; grid-template-columns: 140px 1fr; gap: .4rem .8rem; font-size: .95rem; }

/* Animations */
.fade-in { animation: fade .24s ease both; }
@keyframes fade { from { opacity: 0; transform: translateY(2px); } to { opacity: 1; transform: translateY(0); } }

/* Toast */
.toast-root { position: fixed; right: 1rem; bottom: 1rem; display: grid; gap: .5rem; z-index: 60; }
.toast { background: var(--card); color: var(--text); border: 1px solid var(--border); border-radius: .6rem; padding: .6rem .8rem; box-shadow: 0 6px 18px var(--shadow); }

/* Theme toggle */
.theme-toggle { position: fixed; left: 1rem; bottom: 1rem; padding: .5rem .6rem; border: 1px solid var(--border); border-radius: .6rem; background: var(--surface); color: var(--text); box-shadow: 0 4px 12px var(--shadow); cursor: pointer; }

/* Sections overrides for existing markup */
.main { padding: 2rem 0; }
.hero h1 { font-size: 1.6rem; margin: 0; }
.hero p { color: var(--muted); margin: .4rem 0 0; }
.sidebar h3 { font-size: 1rem; }

/* Utilities */
.mt-1 { margin-top: .25rem; }
.mt-2 { margin-top: .5rem; }
.mt-3 { margin-top: .75rem; }
.mt-4 { margin-top: 1rem; }
.w-full { width: 100%; }