:root {
  --bg: #0b111c;
  --bg-soft: #111a2b;
  --panel: #16203a;
  --panel-2: #1b2743;
  --line: #24314f;
  --text: #e8eefc;
  --muted: #93a3c4;
  --accent: #4da3ff;
  --server: #38d39f;
  --local: #f2b544;
  --danger: #ff6b6b;
  --obstacle: #070c15;
  --radius: 14px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 20% -10%, #16233d 0%, var(--bg) 55%) no-repeat, var(--bg);
  color: var(--text);
  font: 15px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

code, pre, .mono { font-family: var(--mono); font-size: 0.9em; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px 80px; }

/* ---------------- header ---------------- */
header.hero {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(77, 163, 255, 0.08), transparent);
}
.hero-inner { max-width: 1080px; margin: 0 auto; padding: 40px 20px 26px; }
.eyebrow {
  font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}
h1 { margin: 0 0 10px; font-size: 34px; line-height: 1.2; letter-spacing: -0.01em; }
.lede { margin: 0; color: var(--muted); max-width: 720px; }
.tagrow { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tag {
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted); background: var(--bg-soft);
}
.tag.ok { color: var(--server); border-color: rgba(56, 211, 159, 0.4); }
.tag.warn { color: var(--local); border-color: rgba(242, 181, 68, 0.4); }
.tag.bad { color: var(--danger); border-color: rgba(255, 107, 107, 0.45); }

/* ---------------- nav ---------------- */
nav.tabs {
  position: sticky; top: 0; z-index: 20;
  background: rgba(11, 17, 28, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.tabs-inner { max-width: 1080px; margin: 0 auto; padding: 0 12px; display: flex; gap: 4px; overflow-x: auto; }
.tabs button {
  appearance: none; background: none; border: 0; border-bottom: 2px solid transparent;
  color: var(--muted); font: inherit; font-size: 14px; padding: 14px 12px; cursor: pointer;
  white-space: nowrap;
}
.tabs button:hover { color: var(--text); }
.tabs button[aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); }

/* ---------------- sections ---------------- */
section.panel { display: none; padding-top: 34px; }
section.panel.active { display: block; }
h2 { font-size: 22px; margin: 0 0 6px; }
h3 { font-size: 16px; margin: 26px 0 8px; }
.sub { color: var(--muted); margin: 0 0 20px; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; margin: 0 0 16px;
}
.card.tight { padding: 14px 16px; }
.card h3 { margin-top: 0; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
@media (max-width: 820px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

.note {
  border-left: 3px solid var(--local); background: rgba(242, 181, 68, 0.07);
  padding: 12px 16px; border-radius: 0 10px 10px 0; color: #f6e2bb; font-size: 14px;
}
.note strong { color: var(--local); }
.honest {
  border-left: 3px solid var(--accent); background: rgba(77, 163, 255, 0.07);
  padding: 12px 16px; border-radius: 0 10px 10px 0; font-size: 14px; color: #d5e4ff;
}

/* ---------------- controls ---------------- */
.controls { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; margin-bottom: 14px; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 12px; color: var(--muted); letter-spacing: 0.02em; }
select, input[type="range"] { font: inherit; }
select {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--line);
  border-radius: 9px; padding: 7px 10px;
}
input[type="range"] { width: 190px; accent-color: var(--accent); }
button.action {
  appearance: none; border: 1px solid rgba(77, 163, 255, 0.5); background: rgba(77, 163, 255, 0.14);
  color: var(--text); border-radius: 9px; padding: 8px 16px; font: inherit; cursor: pointer;
}
button.action:hover { background: rgba(77, 163, 255, 0.24); }
button.action.ghost { border-color: var(--line); background: var(--bg-soft); color: var(--muted); }
button.action:disabled { opacity: 0.45; cursor: not-allowed; }

/* ---------------- stats ---------------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin: 14px 0 4px; }
.stat { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.stat .k { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.stat .v { font-size: 19px; font-variant-numeric: tabular-nums; margin-top: 3px; }
.stat .v.server { color: var(--server); }
.stat .v.local { color: var(--local); }

/* ---------------- canvas + legend ---------------- */
canvas { display: block; width: 100%; border-radius: 10px; background: var(--bg-soft); }
.canvas-wrap { display: grid; grid-template-columns: minmax(0, 420px) minmax(0, 1fr); gap: 16px; align-items: start; }
@media (max-width: 900px) { .canvas-wrap { grid-template-columns: 1fr; } }
#gridCanvas { aspect-ratio: 1 / 1; image-rendering: pixelated; }
.legend { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 10px; font-size: 12px; color: var(--muted); }
.legend span.swatch { display: inline-block; width: 11px; height: 11px; border-radius: 3px; margin-right: 5px; vertical-align: -1px; }

/* ---------------- tables ---------------- */
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: 0; }
.ok-text { color: var(--server); }
.bad-text { color: var(--danger); }
.warn-text { color: var(--local); }

/* ---------------- pipeline ---------------- */
.pipeline { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 2px; }
.stage {
  flex: 1 1 130px; background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 12px;
}
.stage .n { font-size: 11px; color: var(--accent); letter-spacing: 0.08em; }
.stage .t { font-weight: 600; font-size: 13.5px; margin: 3px 0; }
.stage .d { font-size: 12px; color: var(--muted); }

ul.clean { padding-left: 18px; }
ul.clean li { margin: 5px 0; }
.kv { display: grid; grid-template-columns: minmax(140px, 210px) 1fr; gap: 6px 16px; font-size: 14px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }

footer {
  border-top: 1px solid var(--line); margin-top: 40px; padding: 22px 20px 40px;
  color: var(--muted); font-size: 13px; text-align: center;
}
pre.code {
  background: #0a0f19; border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 14px; overflow-x: auto; color: #cfe2ff; font-size: 13px;
}

/* ---------------- verification table ---------------- */
td.pass { color: var(--server); font-weight: 600; }
td.fail { color: var(--danger); font-weight: 600; }

/* ---------------- report page ---------------- */
body.report .wrap { max-width: 760px; }
body.report h2 {
  font-size: 21px; margin: 40px 0 12px; padding-top: 18px;
  border-top: 1px solid var(--line);
}
body.report h2:first-of-type { border-top: 0; padding-top: 0; }
body.report h3 { font-size: 16.5px; margin: 26px 0 8px; color: var(--accent); }
body.report p { line-height: 1.75; color: #cdd8ef; margin: 12px 0; }
body.report code.math {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 6px;
  padding: 1px 6px; color: #d7e6ff; white-space: nowrap;
}
body.report .abstract { margin-bottom: 8px; }
body.report .abstract h2 { margin-top: 0; border-top: 0; padding-top: 0; font-size: 18px; }
body.report .eyebrow a { color: var(--accent); }
body.report h1 { font-size: 27px; line-height: 1.35; margin: 0 0 10px; }