:root {
  color-scheme: dark;
  --bg: #070b16;
  --bg-soft: #0c1324;
  --card: rgba(18, 27, 48, 0.78);
  --card-strong: #121b30;
  --line: rgba(152, 176, 216, 0.16);
  --line-strong: rgba(152, 176, 216, 0.28);
  --text: #e8eefc;
  --muted: #8fa0bd;
  --accent: #6d9cff;
  --accent-soft: rgba(109, 156, 255, 0.16);
  --good: #46d39a;
  --bad: #ff6b86;
  --warn: #f0b45c;
  --radius: 18px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(900px 500px at 12% -10%, rgba(109, 156, 255, 0.18), transparent 60%),
    radial-gradient(700px 480px at 92% 8%, rgba(70, 211, 154, 0.08), transparent 62%),
    var(--bg);
  color: var(--text);
  font: 15px/1.65 "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.hidden { display: none !important; }

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 28px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 24px;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(7, 11, 22, 0.94), rgba(7, 11, 22, 0.68));
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.brand span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.top nav { display: flex; gap: 6px; margin-left: auto; }
.top nav a {
  padding: 7px 13px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
}
.top nav a:hover, .top nav a.active {
  color: var(--text);
  background: var(--accent-soft);
  text-decoration: none;
}

main { max-width: 1120px; margin: 0 auto; padding: 28px 24px 72px; }
.hero { max-width: 900px; margin: 0 auto; }
.hero-copy { text-align: center; padding: 44px 0 30px; }
h1 {
  margin: 0 0 14px;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.03em;
}
.hero-copy p { margin: 0 auto; max-width: 620px; color: var(--muted); font-size: 16px; }
h2 { margin: 0 0 8px; font-size: 26px; letter-spacing: -0.02em; }
h3 { margin: 0 0 8px; font-size: 15px; }
p { margin: 0 0 10px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}
.form { display: grid; gap: 16px; }
.field { display: grid; gap: 7px; }
.field > span { color: var(--muted); font-size: 13px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.narrow { min-width: 0; }
input, select, button { font: inherit; }
input, select {
  width: 100%;
  padding: 12px 14px;
  color: var(--text);
  background: rgba(4, 8, 18, 0.72);
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input::placeholder { color: #60708c; }
input:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(109, 156, 255, 0.16);
}
select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 34px; }
.advanced {
  border: 1px dashed var(--line-strong);
  border-radius: 12px;
  padding: 12px 14px;
}
.advanced summary { cursor: pointer; color: var(--muted); font-size: 13px; }
.advanced[open] summary { margin-bottom: 12px; color: var(--text); }
.advanced .field + .field, .advanced .row + .field, .advanced .field + .check { margin-top: 12px; }
.check { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 13px; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }
.actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
button.primary {
  padding: 12px 24px;
  color: #06101f;
  background: linear-gradient(135deg, #8fb4ff, var(--accent));
  border: 0;
  border-radius: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s, filter 0.12s;
}
button.primary:hover { filter: brightness(1.06); transform: translateY(-1px); }
button.primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
button.ghost {
  padding: 10px 16px;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  cursor: pointer;
}
button.ghost:hover { background: var(--accent-soft); }
.hint { color: var(--muted); font-size: 13px; }
.banner {
  margin: 0 0 16px;
  padding: 12px 16px;
  color: var(--warn);
  background: rgba(240, 180, 92, 0.1);
  border: 1px solid rgba(240, 180, 92, 0.32);
  border-radius: 12px;
}

.progress { display: flex; align-items: center; gap: 16px; margin-top: 16px; }
.progress p { margin: 2px 0 0; }
.spinner {
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  border: 2px solid rgba(109, 156, 255, 0.24);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

#result { display: grid; gap: 16px; margin-top: 18px; }
.result-head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.result-head h2 { margin: 0; font-size: 22px; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 650;
  border: 1px solid transparent;
}
.badge.good { color: var(--good); background: rgba(70, 211, 154, 0.12); border-color: rgba(70, 211, 154, 0.3); }
.badge.bad { color: var(--bad); background: rgba(255, 107, 134, 0.12); border-color: rgba(255, 107, 134, 0.3); }
.badge.warn { color: var(--warn); background: rgba(240, 180, 92, 0.12); border-color: rgba(240, 180, 92, 0.3); }
.badge.muted { color: var(--muted); background: rgba(143, 160, 189, 0.1); border-color: var(--line-strong); }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.metric { display: flex; justify-content: space-between; gap: 14px; padding: 7px 0; border-bottom: 1px solid var(--line); }
.metric:last-child { border-bottom: 0; }
.metric span:first-child { color: var(--muted); }
.metric strong { font-variant-numeric: tabular-nums; text-align: right; }
.result-note { margin: 12px 0 0; color: var(--muted); font-size: 13px; }
.warnings { margin: 12px 0 0; padding-left: 18px; color: var(--warn); font-size: 13px; }
details.evidence { margin-top: 16px; }
details.evidence summary { cursor: pointer; color: var(--muted); font-size: 13px; }
.answer {
  margin-top: 10px;
  padding: 12px 14px;
  background: rgba(4, 8, 18, 0.55);
  border: 1px solid var(--line);
  border-radius: 11px;
  font-size: 13px;
}
.answer pre { margin: 8px 0 0; white-space: pre-wrap; word-break: break-word; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 12px; }
.result-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.panel { margin-top: 76px; }
.section-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tabs button {
  padding: 7px 12px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
}
.tabs button.active { color: var(--text); background: var(--accent-soft); border-color: rgba(109, 156, 255, 0.35); }
table.board { width: 100%; border-collapse: collapse; font-size: 13px; }
table.board th, table.board td { padding: 10px 8px; text-align: left; border-bottom: 1px solid var(--line); }
table.board th { color: var(--muted); font-weight: 500; white-space: nowrap; }
table.board td { font-variant-numeric: tabular-nums; }
table.board tr:last-child td { border-bottom: 0; }
.footnote { margin-top: 14px; color: #6f7f9c; font-size: 12px; }

#method h2 { margin-bottom: 18px; }
.method-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.method-grid .card { box-shadow: none; }
.method-grid p { color: var(--muted); font-size: 14px; margin: 0; }

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
  color: #64738e;
  font-size: 12px;
  border-top: 1px solid var(--line);
}

@media (max-width: 720px) {
  .top { gap: 12px; padding: 14px 16px; }
  .brand span { display: none; }
  main { padding: 18px 16px 56px; }
  .hero-copy { padding: 28px 0 22px; }
  .row, .cards, .method-grid { grid-template-columns: 1fr; }
  .card { padding: 18px; border-radius: 15px; }
  .footer { padding: 20px 16px; }
  table.board { display: block; overflow-x: auto; }
}