:root {
  --bg: #0c0a12; --surface: #15121f; --surface2: #1e1a2c; --border: #342e4a;
  --text: #f0eaf8; --muted: #a89bc4; --accent: #a78bfa; --pink: #f472b6; --good: #34d399;
  --input-bg: #0e0b16; --glow: #2a1848;
  --font: "Segoe UI", system-ui, sans-serif;
}
html[data-theme="light"] {
  --bg: #f5f3ff; --surface: #ffffff; --surface2: #f5f3ff; --border: #e9e5ff;
  --text: #1e1b4b; --muted: #5b567a; --accent: #6d28d9; --pink: #db2777; --good: #059669;
  --input-bg: #ffffff; --glow: #ede9fe;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: var(--font); color: var(--text); line-height: 1.65; min-height: 100vh;
  background: radial-gradient(800px 400px at 10% 0%, var(--glow) 0%, transparent 50%), var(--bg);
}
a { color: var(--accent); }
.wrap { max-width: 720px; margin: 0 auto; padding: 24px 18px 64px; }
nav.top {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
nav.top a {
  color: var(--muted); text-decoration: none; padding: 6px 12px;
  border: 1px solid var(--border); border-radius: 999px; font-size: .88rem;
}
nav.top a.home {
  background: linear-gradient(135deg, #7c3aed, #a78bfa); color: #fff; border: none; font-weight: 700;
}
.theme-btn {
  appearance: none; cursor: pointer; font: inherit; font-size: .88rem; font-weight: 600;
  color: var(--muted); background: var(--surface); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 999px;
}
.badge {
  display: inline-block; font-size: 11px; text-transform: uppercase; letter-spacing: .04em;
  color: #e9d5ff; background: rgba(167,139,250,.15); border: 1px solid rgba(167,139,250,.4);
  padding: 4px 10px; border-radius: 999px; margin-bottom: 12px;
}
html[data-theme="light"] .badge { color: #5b21b6; background: rgba(109,40,217,.1); border-color: rgba(109,40,217,.3); }
h1 { font-size: clamp(1.45rem, 4vw, 2rem); margin: 0 0 12px; line-height: 1.25; }
.lede { color: var(--muted); font-size: 1.05rem; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 18px; margin: 18px 0;
}
label { display: block; font-size: .88rem; color: var(--muted); margin-bottom: 5px; }
.field { margin-bottom: 12px; }
input {
  width: 100%; background: var(--input-bg); border: 1px solid var(--border); color: var(--text);
  border-radius: 10px; padding: 11px 12px; font-size: 1rem;
}
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 520px) { .row2 { grid-template-columns: 1fr; } }
.big { font-size: 1.7rem; font-weight: 800; color: var(--pink); margin: 10px 0 4px; }
.sub { color: var(--muted); font-size: .9rem; }
.btn {
  border: none; border-radius: 10px; padding: 11px 16px; font-weight: 700; cursor: pointer;
  background: linear-gradient(135deg, #7c3aed, #a78bfa); color: #fff;
}
.presets { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.preset {
  border: 1px dashed var(--border); background: transparent; color: var(--muted);
  font-size: .78rem; padding: 6px 10px; border-radius: 8px; cursor: pointer; font-weight: 600;
}
.metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 12px; }
.metric { background: var(--surface2); border: 1px solid var(--border); border-radius: 10px; padding: 10px; }
.metric .k { font-size: .7rem; text-transform: uppercase; color: var(--muted); }
.metric .v { font-weight: 700; margin-top: 3px; }
article h2 { font-size: 1.2rem; margin: 28px 0 10px; }
article p, article li { color: var(--muted); }
article ul, article ol { padding-left: 1.2rem; }
details {
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; margin-bottom: 8px;
}
summary { cursor: pointer; font-weight: 650; color: var(--text); }
details p { margin: 10px 0 0; }
.cta {
  display: inline-block; margin: 6px 8px 6px 0; padding: 10px 14px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  text-decoration: none; color: var(--text); font-weight: 600;
}
.warn {
  background: rgba(251,191,36,.08); border: 1px solid rgba(251,191,36,.3);
  color: #b45309; border-radius: 10px; padding: 12px; font-size: .9rem; margin: 14px 0;
}
html:not([data-theme="light"]) .warn { color: #fde68a; }
footer {
  margin-top: 36px; padding-top: 16px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: .85rem;
}