:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-soft: #f9fbff;
  --line: #d5dfef;
  --line-strong: #b8c6db;
  --text: #172033;
  --muted: #56657a;
  --accent: #245edb;
  --accent-soft: #e7efff;
  --accent2: #7c3aed;
  --accent2-soft: #ede9fe;
  --ok: #147a5f;
  --ok-soft: #e7f6f0;
  --warn: #98610a;
  --warn-soft: #fdf2dc;
  --p0: #c2410c;
  --p0-soft: #ffedd5;
  --p1: #b45309;
  --p1-soft: #fef3c7;
  --p2: #6d28d9;
  --p2-soft: #ede9fe;
  --shadow: 0 14px 34px rgba(39, 52, 83, 0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; color: var(--text); background: var(--bg); }
a { color: inherit; }

/* ---------- Layout: sidebar + content ---------- */
.shell {
  display: grid;
  grid-template-columns: 264px minmax(0, 1fr);
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 18px 14px 28px;
  border-right: 1px solid var(--line);
  background: var(--panel);
}

.brand {
  display: block;
  padding: 4px 8px 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
  text-decoration: none;
}
.brand b { display: block; font-size: 15px; line-height: 1.3; color: var(--text); }
.brand span { display: block; margin-top: 4px; font-size: 12px; line-height: 1.4; color: var(--muted); }

.nav-group { margin-bottom: 14px; }
.nav-group > .nav-label {
  display: block;
  padding: 4px 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none;
  line-height: 1.3;
}
.nav-link:hover { color: var(--accent); background: var(--accent-soft); }
.nav-link.active { color: var(--accent); background: var(--accent-soft); }
.nav-link.sub { padding-left: 18px; font-size: 13px; font-weight: 500; }

.dot { flex: 0 0 auto; width: 7px; height: 7px; border-radius: 50%; background: var(--line-strong); }
.dot.ok { background: var(--ok); }
.dot.active { background: var(--accent); }
.dot.init { background: var(--warn); }
.dot.archived { background: var(--line-strong); }

/* ---------- Content ---------- */
.content { width: min(1120px, 100%); margin: 0 auto; padding: 22px 26px 64px; }

.page-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin: 2px 0 16px;
}
.page-head h1.page-title { font-size: clamp(22px, 3vw, 30px); margin: 0; line-height: 1.15; }
.page-head .page-sub { color: var(--muted); font-size: 14px; }

.snapshot {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.8fr);
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
h1 { margin: 0; font-size: clamp(24px, 3.4vw, 34px); line-height: 1.14; }
.subtitle { max-width: 760px; margin: 12px 0 0; color: var(--muted); font-size: 15.5px; line-height: 1.66; }

.pill-row { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  display: inline-flex; align-items: center; min-height: 24px; padding: 3px 9px;
  border: 1px solid var(--line); border-radius: 20px; background: var(--panel-soft);
  color: var(--muted); font-size: 12.5px; font-weight: 600;
}
.pill.accent { border-color: #bcd0f6; color: var(--accent); background: var(--accent-soft); }
.pill.accent2 { border-color: #d6c8f5; color: var(--accent2); background: var(--accent2-soft); }

.meta-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.meta { min-height: 62px; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-soft); }
.meta span { display: block; color: var(--muted); font-size: 12px; line-height: 1.3; }
.meta strong { display: block; margin-top: 5px; font-size: 14px; line-height: 1.35; }

.status {
  display: inline-flex; align-items: center; min-height: 26px; padding: 4px 8px;
  border: 1px solid #b9d9ce; border-radius: 8px; color: var(--ok); background: #f1fbf7;
  font-size: 13px; font-weight: 700;
}

section {
  scroll-margin-top: 18px; margin-top: 16px; padding: 20px;
  border: 1px solid var(--line); border-radius: 8px; background: var(--panel);
}
.section-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
h2 { margin: 0; font-size: 20px; line-height: 1.3; }
h3 { margin: 18px 0 10px; font-size: 15.5px; line-height: 1.35; }
.hint { flex: 0 0 auto; max-width: 46%; text-align: right; color: var(--muted); font-size: 12.5px; line-height: 1.5; }
.lead { margin: 0 0 4px; color: var(--muted); font-size: 14px; line-height: 1.7; }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.cards.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { padding: 13px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-soft); }
.card b { display: block; margin-bottom: 6px; font-size: 14px; line-height: 1.35; }
.card p, .card ul { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.62; }
.card ul { padding-left: 17px; }

table { width: 100%; border-collapse: collapse; overflow-wrap: anywhere; }
th, td { padding: 9px 10px; border: 1px solid var(--line); text-align: left; vertical-align: top; font-size: 13px; line-height: 1.45; }
th { color: #27364c; background: var(--accent-soft); font-weight: 700; }
.scroll-x { overflow-x: auto; }

/* ---------- Subproject cards ---------- */
.subcard { border: 1px solid var(--line); border-radius: 8px; background: var(--panel-soft); padding: 15px 16px; }
.subcard + .subcard { margin-top: 12px; }
.subcard-head { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.subcard-head b { font-size: 15px; }
.subcard-head .path { font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; font-size: 12px; color: var(--muted); }

.badge {
  display: inline-flex; align-items: center; min-height: 22px; padding: 2px 9px;
  border-radius: 20px; font-size: 11.5px; font-weight: 700; letter-spacing: 0.02em; border: 1px solid transparent;
}
.badge.active { color: var(--accent); background: var(--accent-soft); border-color: #bcd0f6; }
.badge.ok { color: var(--ok); background: var(--ok-soft); border-color: #b9d9ce; }
.badge.init { color: var(--warn); background: var(--warn-soft); border-color: #ecd9ab; }
.badge.archived { color: var(--muted); background: #eef1f6; border-color: var(--line); }
.badge.p0 { color: var(--p0); background: var(--p0-soft); border-color: #f3c8a8; }
.badge.p1 { color: var(--p1); background: var(--p1-soft); border-color: #ecd9ab; }
.badge.p2 { color: var(--p2); background: var(--p2-soft); border-color: #d6c8f5; }

.subcard p { margin: 0 0 8px; color: var(--muted); font-size: 13.5px; line-height: 1.62; }
.subcard .next {
  margin: 8px 0 0; padding: 8px 11px; border-left: 3px solid var(--accent); border-radius: 0 7px 7px 0;
  background: var(--accent-soft); color: #2a3a55; font-size: 12.8px; line-height: 1.55;
}
.subcard .links { margin-top: 9px; display: flex; flex-wrap: wrap; gap: 7px; }

.chip {
  display: inline-flex; align-items: center; gap: 5px; padding: 3px 9px;
  border: 1px solid var(--line); border-radius: 7px; background: var(--panel);
  color: var(--muted); font-size: 12px; font-weight: 600; text-decoration: none;
}
.chip:hover { color: var(--accent); border-color: #bcd0f6; }
.chip.go { color: var(--accent); border-color: #bcd0f6; background: var(--accent-soft); }

code {
  padding: 1px 4px; border: 1px solid var(--line); border-radius: 6px; background: #f3f6fb; color: #29374d;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; font-size: 0.92em;
}

/* ---------- Flow diagram ---------- */
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 8px; margin: 4px 0 2px; }
.flow-step {
  flex: 1 1 120px; min-width: 110px; padding: 11px 12px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--panel-soft); font-size: 12.6px; line-height: 1.4;
}
.flow-step b { display: block; margin-bottom: 3px; font-size: 12px; color: var(--accent); text-transform: uppercase; letter-spacing: 0.03em; }
.flow-step.verify { border-color: #d6c8f5; background: var(--accent2-soft); }
.flow-step.verify b { color: var(--accent2); }
.flow-arrow { align-self: center; color: var(--line-strong); font-size: 16px; font-weight: 700; }

/* ---------- Paper survey ---------- */
.tax-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; }
.tax-card { padding: 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-soft); }
.tax-card h4 { margin: 0 0 8px; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }

.tags { display: flex; flex-wrap: wrap; gap: 5px; }
.tag { font-size: 11.5px; font-weight: 600; padding: 2px 8px; border-radius: 5px; background: #eef1f6; color: var(--muted); }
.tag.rl { background: var(--accent-soft); color: var(--accent); }
.tag.browser { background: var(--ok-soft); color: var(--ok); }
.tag.attr { background: var(--accent2-soft); color: var(--accent2); }
.tag.bench { background: var(--warn-soft); color: var(--warn); }
.tag.chart { background: #fef3c7; color: #92400e; }
.tag.svg { background: #fde7e7; color: #c0392b; }

.timeline { position: relative; margin: 10px 0 4px; padding-left: 24px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 4px; bottom: 4px; width: 2px; background: var(--line); }
.tl-item { position: relative; margin-bottom: 11px; padding-left: 4px; }
.tl-item::before {
  content: ""; position: absolute; left: -22px; top: 4px; width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--panel); box-shadow: 0 0 0 2px var(--accent);
}
.tl-date { font-size: 12px; font-weight: 700; color: var(--muted); }
.tl-text { font-size: 13.2px; line-height: 1.5; }

.paper { border: 1px solid var(--line); border-radius: 8px; background: var(--panel-soft); padding: 15px 16px; }
.paper + .paper { margin-top: 11px; }
.paper-title { font-size: 14.5px; font-weight: 700; line-height: 1.4; }
.paper-title a { color: var(--accent); text-decoration: none; }
.paper-title a:hover { text-decoration: underline; }
.paper-meta { margin: 7px 0; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.paper-id { font-size: 11.5px; color: var(--muted); background: #eef1f6; padding: 2px 7px; border-radius: 5px; font-family: "SFMono-Regular", Consolas, monospace; }
.paper-venue { font-size: 11px; color: #fff; background: var(--ok); padding: 2px 7px; border-radius: 5px; font-weight: 700; }

.insight { margin: 9px 0; padding: 9px 12px; border-left: 3px solid var(--accent); border-radius: 0 7px 7px 0; background: var(--accent-soft); font-size: 13px; line-height: 1.6; }
.insight strong { color: var(--accent); }
.paper p.abstract { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.66; }

details.more { margin-top: 9px; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; background: var(--panel); }
details.more > summary { cursor: pointer; padding: 8px 12px; font-size: 12.8px; font-weight: 700; color: var(--muted); user-select: none; }
details.more[open] > summary { border-bottom: 1px solid var(--line); }
details.more .body { padding: 12px; font-size: 12.8px; color: var(--muted); line-height: 1.65; }
details.more .body h5 { margin: 10px 0 4px; font-size: 13px; color: var(--text); }
details.more .body h5:first-child { margin-top: 0; }
details.more .body ul { margin: 0 0 6px; padding-left: 18px; }

.gap-box { margin-top: 12px; padding: 14px 16px; border: 1px solid #ecd9ab; border-radius: 8px; background: var(--warn-soft); }
.gap-box h4 { margin: 0 0 8px; color: var(--warn); font-size: 14px; }
.gap-box ul { margin: 0; padding-left: 18px; color: #5e4a1f; font-size: 13px; line-height: 1.6; }

.takeaway-box { margin-top: 12px; padding: 14px 16px; border: 1px solid #b9d9ce; border-radius: 8px; background: var(--ok-soft); }
.takeaway-box h4 { margin: 0 0 8px; color: var(--ok); font-size: 14px; }
.takeaway-box p { margin: 0 0 6px; color: #1f4c3f; font-size: 13px; line-height: 1.6; }
.takeaway-box p:last-child { margin-bottom: 0; }

.footer { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12.5px; line-height: 1.6; }

/* ---------- Mobile ---------- */
.menu-toggle { display: none; }

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: sticky; top: 0; height: auto; max-height: 60vh;
    border-right: none; border-bottom: 1px solid var(--line); z-index: 20;
  }
  .nav-body { display: none; }
  .sidebar.open .nav-body { display: block; }
  .menu-toggle {
    display: inline-flex; align-items: center; gap: 8px; width: 100%; padding: 9px 10px;
    border: 1px solid var(--line); border-radius: 8px; background: var(--panel-soft);
    color: var(--text); font-size: 14px; font-weight: 700; cursor: pointer;
  }
  .content { padding: 16px 16px 56px; }
  .snapshot, .cards, .cards.two { grid-template-columns: 1fr; }
  .meta-grid { grid-template-columns: 1fr; }
  .section-head { flex-direction: column; }
  .hint { max-width: 100%; text-align: left; }
}