:root {
  --bg: #f7f9fb;
  --surface: #ffffff;
  --surface-muted: #eef4f7;
  --ink: #0f172a;
  --muted: #526174;
  --border: #d9e2e8;
  --brand: #0369a1;
  --brand-soft: #e0f2fe;
  --accent: #047857;
  --accent-soft: #dff7ec;
  --warning: #8a4b08;
  --warning-bg: #fff4d6;
  --danger: #b42318;
  --focus: #0ea5e9;
  --radius: 14px;
  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.25rem;
  --z-sticky: 20;
}

* { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
}
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--brand); text-underline-offset: 0.2em; }
img, svg { display: block; max-width: 100%; }
h1, h2, h3 { line-height: 1.25; text-wrap: balance; }
p, li { text-wrap: pretty; }

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 65%, white);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  left: var(--space-3);
  top: -5rem;
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--ink);
  color: white;
}
.skip-link:focus { top: var(--space-3); }

.demo-banner {
  background: var(--warning-bg);
  color: #603300;
  border-bottom: 1px solid #e8c878;
  padding: 0.55rem 1rem;
  text-align: center;
  font-weight: 700;
}
.demo-banner.production { background: var(--accent-soft); color: #064e3b; border-color: #9bd9bd; }

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--border);
}
.wrap { width: min(1160px, calc(100% - 2rem)); margin-inline: auto; }
.site-bar { min-height: 4rem; display: flex; align-items: center; gap: var(--space-3); }
.brand { display: flex; align-items: center; gap: var(--space-2); color: var(--ink); text-decoration: none; font-weight: 800; }
.brand img { width: 2rem; height: 2rem; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 0.25rem; }
.site-nav a { padding: 0.5rem 0.7rem; color: var(--muted); text-decoration: none; border-radius: 8px; }
.site-nav a:hover, .site-nav a[aria-current="page"] { background: var(--surface-muted); color: var(--ink); }

main { padding-block: var(--space-5); }
.page-intro { max-width: 72ch; margin-bottom: var(--space-4); }
.page-intro h1 { margin: 0 0 var(--space-2); font-size: 2rem; letter-spacing: -0.025em; }
.page-intro p { margin: 0; color: var(--muted); }
.lede { font-size: 1.1rem; color: var(--muted); }

.notice {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
  padding: var(--space-3);
  background: var(--brand-soft);
  border: 1px solid #a6d9f4;
  border-radius: 10px;
  color: #0c4a6e;
}
.notice.warning { background: var(--warning-bg); border-color: #e8c878; color: #603300; }
.notice.error { background: #fff0ee; border-color: #f0aca5; color: #7a271a; }

.toolbar { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-3); }
.field { display: flex; flex-direction: column; gap: 0.35rem; min-width: 0; }
.field label, .field-label { font-weight: 700; font-size: 0.9rem; }
.field small { color: var(--muted); }
input, select, textarea {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.65rem 0.75rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid #b8c5cf;
  border-radius: 9px;
}
textarea { min-height: 7rem; resize: vertical; }
input::placeholder, textarea::placeholder { color: #58687a; opacity: 1; }
input:disabled, select:disabled, textarea:disabled { background: #edf1f4; color: #64748b; cursor: not-allowed; }

.btn {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.6rem 1rem;
  border: 1px solid #aebdc8;
  border-radius: 9px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
  transition: background 180ms ease-out, border-color 180ms ease-out, transform 180ms ease-out;
}
.btn:hover { background: var(--surface-muted); border-color: #8fa1ad; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: white; }
.btn.primary:hover { background: #075985; }
.btn.danger { color: var(--danger); border-color: #e1a7a2; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.split { display: grid; grid-template-columns: minmax(250px, 330px) minmax(0, 1fr); gap: var(--space-3); align-items: start; }
.catalog-list { display: flex; flex-direction: column; gap: 0.5rem; }
.catalog-item {
  width: 100%;
  text-align: left;
  padding: 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.catalog-item:hover { border-color: #8ab7d0; }
.catalog-item[aria-selected="true"] { border-color: var(--brand); background: #f0f9ff; }
.catalog-item strong { display: block; }
.meta { color: var(--muted); font-size: 0.875rem; }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
}
.panel + .panel { margin-top: var(--space-3); }
.panel h2, .panel h3 { margin-top: 0; }
.practice-figure { margin: var(--space-3) 0; }
.preview-map { width: 100%; max-height: 500px; object-fit: contain; background: #eef3f5; border-radius: 10px; }
.evidence-map-viewport {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: #eef3f5;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.evidence-map-source {
  position: absolute;
  display: block;
  max-width: none;
  height: auto;
}
.preview-caption { margin-top: var(--space-2); color: var(--muted); font-size: 0.9rem; }

.badge, .status {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--surface-muted);
  color: #334155;
  font-size: 0.8rem;
  font-weight: 750;
}
.badge.good { background: var(--accent-soft); color: #065f46; }
.badge.pending { background: var(--warning-bg); color: #6b3a05; }

.mode-picker {
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) minmax(420px, 1.28fr);
  gap: var(--space-4);
  align-items: end;
  margin-bottom: var(--space-3);
}
.mode-picker-copy h2 { margin: 0 0 0.2rem; font-size: 1rem; }
.mode-picker-copy p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.mode-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.25rem;
  padding: 0.25rem;
  background: #e8eef2;
  border-radius: 12px;
}
.mode-tab {
  min-height: 4rem;
  padding: 0.55rem 0.8rem;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
  transition: background 180ms ease-out, color 180ms ease-out, box-shadow 180ms ease-out;
}
.mode-tab:hover { background: rgba(255, 255, 255, 0.55); color: var(--ink); }
.mode-tab[aria-selected="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 2px 6px rgba(15, 23, 42, 0.12); }
.mode-tab-title, .mode-tab-meta { display: block; }
.mode-tab-title { font-weight: 800; }
.mode-tab-meta { margin-top: 0.1rem; font-size: 0.82rem; color: inherit; }

.workflow { display: grid; gap: var(--space-3); }
.step { padding-top: var(--space-3); border-top: 1px solid var(--border); scroll-margin-top: 5rem; }
.step:first-child { border-top: 0; padding-top: 0; }
.step-head { display: flex; align-items: baseline; gap: var(--space-2); }
.step-number { color: var(--brand); font-weight: 850; }
.step h2 { margin: 0; font-size: 1.25rem; }

.candidate-list { display: flex; flex-direction: column; gap: 0.5rem; margin-top: var(--space-3); }
.candidate {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}
.candidate.selected { border-color: var(--brand); background: #f0f9ff; }
.map-confirm { display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, 320px); gap: var(--space-3); margin-top: var(--space-3); }
.location-map { min-height: 220px; width: 100%; background: #e8f1f4; border: 1px solid var(--border); border-radius: 10px; }
.location-map polygon { fill: #76b9a0; stroke: #075985; stroke-width: 2; vector-effect: non-scaling-stroke; }

.data-table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.data-table th, .data-table td { padding: 0.7rem 0.6rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.data-table th { color: #334155; font-size: 0.875rem; }
.table-wrap { overflow-x: auto; }

.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
.form-grid .wide { grid-column: 1 / -1; }
.checks { display: flex; gap: var(--space-3); flex-wrap: wrap; padding-top: 0.4rem; }
.checks label { display: inline-flex; gap: 0.5rem; align-items: center; font-weight: 500; }
.checks input { width: 1.2rem; min-height: 1.2rem; }

.tool-trace { margin: var(--space-3) 0; padding: 0; list-style: none; }
.tool-trace li { padding: 0.35rem 0; color: var(--muted); }
.tool-trace li::before { content: "✓"; color: var(--accent); margin-right: 0.5rem; font-weight: 800; }
.plan-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-3); }
.plan {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
}
.plan h3 { margin: 0 0 0.4rem; }
.plan-dimensions { display: grid; grid-template-columns: auto 1fr; gap: 0.35rem 0.7rem; margin: var(--space-3) 0; font-size: 0.9rem; }
.plan-dimensions dt { color: var(--muted); }
.plan-dimensions dd { margin: 0; font-weight: 700; }
.measure { padding-block: var(--space-2); border-top: 1px solid var(--border); }
.measure strong { display: block; }
.auxiliary { padding: var(--space-2); background: var(--surface-muted); border-radius: 9px; font-size: 0.9rem; }

.deep-diagnosis { display: grid; gap: var(--space-4); }
.deep-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
  gap: var(--space-4);
  align-items: start;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
}
.deep-heading h2 { margin: 0.55rem 0 0.35rem; font-size: 1.5rem; }
.deep-heading p { max-width: 68ch; margin: 0; color: var(--muted); }
.deep-stage-note {
  padding: var(--space-3);
  background: var(--surface-muted);
  border-radius: 10px;
  color: #334155 !important;
  font-size: 0.9rem;
}
.deep-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(260px, 0.8fr);
  gap: var(--space-4);
  align-items: start;
}
.deep-form { min-width: 0; }
.field-heading { display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-2); }
.field-help { max-width: 70ch; margin: 0 0 var(--space-2); color: var(--muted); font-size: 0.9rem; }
.character-count { color: var(--muted); font-size: 0.82rem; font-variant-numeric: tabular-nums; white-space: nowrap; }
.character-count.near-limit { color: var(--warning); font-weight: 750; }
#deep-diagnosis-input {
  min-height: 24rem;
  padding: var(--space-3);
  line-height: 1.7;
  background: #fbfdfe;
}
#deep-diagnosis-input:focus { background: var(--surface); }
#deep-diagnosis-input[aria-invalid="true"] { border-color: var(--danger); box-shadow: 0 0 0 2px rgba(180, 35, 24, 0.12); }
.deep-form-actions { display: flex; justify-content: space-between; gap: var(--space-2); margin-top: var(--space-3); }
.privacy-note { margin: var(--space-2) 0 0; color: var(--muted); font-size: 0.82rem; }
.data-guide { padding-left: var(--space-4); border-left: 1px solid var(--border); }
.data-guide h3 { margin: 0 0 0.25rem; font-size: 1rem; }
.data-guide > p { margin: 0 0 var(--space-3); color: var(--muted); font-size: 0.9rem; }
.data-guide-list { margin: 0; }
.data-guide-list > div {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: var(--space-2);
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
}
.data-guide-list dt { font-weight: 800; color: #334155; }
.data-guide-list dd { margin: 0; color: var(--muted); font-size: 0.88rem; }
.deep-example { margin-top: var(--space-3); }
.deep-example summary { color: var(--brand); font-weight: 750; cursor: pointer; }
.deep-example p { margin-bottom: 0; color: var(--muted); font-size: 0.88rem; }

.deep-review { padding-top: var(--space-4); border-top: 1px solid var(--border); scroll-margin-top: 5rem; }
.deep-review-heading { display: flex; justify-content: space-between; align-items: center; gap: var(--space-3); }
.deep-review-heading h3 { margin: 0.35rem 0 0; font-size: 1.25rem; }
.deep-review-summary { margin: var(--space-2) 0 var(--space-3); color: var(--muted); }
.review-groups { border-top: 1px solid var(--border); }
.review-group {
  display: grid;
  grid-template-columns: minmax(7rem, 0.7fr) minmax(0, 2fr) auto;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border);
}
.review-group h4 { margin: 0; font-size: 1rem; }
.review-group p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.review-group .review-snippet { margin-top: 0.2rem; color: #64748b; font-size: 0.82rem; }
.review-group .status.detected { background: var(--accent-soft); color: #065f46; }
.review-group .status.missing { background: var(--warning-bg); color: #6b3a05; }
.review-notices { display: grid; gap: var(--space-2); margin-top: var(--space-3); }
.next-stage {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
  padding: var(--space-3);
  background: var(--surface-muted);
  border-radius: 10px;
}
.next-stage p { margin: 0.15rem 0 0; color: var(--muted); font-size: 0.9rem; }
.next-stage .btn { flex: 0 0 auto; }

.history-list { display: flex; flex-direction: column; gap: var(--space-3); }
.history-item { padding-bottom: var(--space-3); border-bottom: 1px solid var(--border); }
.history-item:last-child { border-bottom: 0; }
.empty { padding: var(--space-4); color: var(--muted); text-align: center; border: 1px dashed #aebdc8; border-radius: 10px; }
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-footer { margin-top: var(--space-5); background: var(--surface); border-top: 1px solid var(--border); }
.site-footer .wrap { padding-block: var(--space-4); color: var(--muted); display: flex; justify-content: space-between; gap: var(--space-3); flex-wrap: wrap; }

@media (max-width: 900px) {
  .split, .map-confirm, .mode-picker, .deep-heading, .deep-layout { grid-template-columns: 1fr; }
  .plan-grid { grid-template-columns: 1fr; }
  .data-guide { padding: var(--space-4) 0 0; border-left: 0; border-top: 1px solid var(--border); }
  .site-bar { align-items: flex-start; padding-block: 0.7rem; flex-wrap: wrap; }
  .site-nav { width: 100%; margin-left: 0; overflow-x: auto; padding-bottom: 0.2rem; }
  .site-nav a { white-space: nowrap; }
}

@media (max-width: 640px) {
  .wrap { width: min(100% - 1rem, 1160px); }
  main { padding-block: var(--space-4); }
  .page-intro h1 { font-size: 1.65rem; }
  .panel { padding: var(--space-3); }
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .wide { grid-column: auto; }
  .candidate { align-items: flex-start; flex-direction: column; }
  .btn { width: 100%; }
  .toolbar .btn { width: auto; }
  .mode-tabs { grid-template-columns: 1fr; }
  .deep-form-actions, .deep-review-heading, .next-stage { align-items: stretch; flex-direction: column; }
  .review-group { grid-template-columns: 1fr; gap: 0.35rem; }
  #deep-diagnosis-input { min-height: 20rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}