:root {
  --paper: #f5f2ea; --paper2: #ece7da; --card: #fbfaf6; --ink: #1d1c1a; --ink2: rgba(29, 28, 26, .64);
  --line: rgba(29, 28, 26, .2); --accent: #27457f; --warm: #b8552d;
  --serif: 'Songti SC', 'Noto Serif CJK SC', 'Source Han Serif SC', STSong, SimSun, serif;
  --sans: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--ink); font: 15px/1.7 var(--sans); background: var(--paper);
  background-image: linear-gradient(rgba(29, 28, 26, .045) 1px, transparent 1px), linear-gradient(90deg, rgba(29, 28, 26, .045) 1px, transparent 1px);
  background-size: 32px 32px; -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, input, select { font: inherit; color: inherit; }
.mono { font-family: var(--mono); font-size: 11.5px; letter-spacing: .12em; text-transform: uppercase; }
.accent { color: var(--accent); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 18px; border: 1px solid var(--ink);
  background: var(--ink); color: var(--paper); border-radius: 2px; cursor: pointer; text-decoration: none; font-weight: 600; white-space: nowrap;
}
.btn:hover { background: var(--accent); border-color: var(--accent); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn.sm { padding: 5px 10px; font-size: 12.5px; font-weight: 500; }
.btn:disabled { opacity: .45; cursor: default; }
.brand { display: inline-flex; align-items: baseline; gap: 10px; text-decoration: none; }
.brand b { font: 700 21px/1 var(--serif); letter-spacing: .01em; white-space: nowrap; }
.brand i { font: normal 11px var(--sans); letter-spacing: .12em; white-space: nowrap; color: var(--ink2); }
.brand::before { content: ''; width: 13px; height: 13px; border: 2px solid var(--warm); border-radius: 50%; align-self: center; box-shadow: inset 0 0 0 3px var(--paper), inset 0 0 0 8px var(--warm); }

/* ---------- 首页 ---------- */
.nav { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 28px; padding: 14px 40px; background: rgba(245, 242, 234, .92); backdrop-filter: blur(6px); border-bottom: 1px solid var(--ink); }
.nav nav { display: flex; gap: 24px; margin-left: auto; font-size: 14px; }
.nav nav a { text-decoration: none; color: var(--ink2); }
.nav nav a:hover { color: var(--ink); }
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 40px; }
.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 56px; align-items: center; padding: 64px 0 72px; }
.hero h1 { font: 700 clamp(34px, 4.3vw, 56px)/1.2 var(--serif); margin: 18px 0 20px; letter-spacing: .01em; text-wrap: balance; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { font-size: 17px; color: var(--ink2); max-width: 30em; margin: 0 0 28px; }
.go { display: flex; border: 1.5px solid var(--ink); background: var(--card); max-width: 520px; border-radius: 2px; }
.go input { flex: 1; min-width: 0; border: 0; background: none; padding: 14px 16px; outline: none; font-size: 16px; }
.go .btn { border-radius: 0; margin: -1.5px; }
.facts { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 22px 0 0; padding: 0; list-style: none; color: var(--ink2); }
.facts li::before { content: '— '; color: var(--warm); }
.stage { position: relative; border: 1px solid var(--ink); background: var(--paper); box-shadow: 10px 10px 0 var(--paper2), 10px 10px 0 1px var(--ink); }
.stage svg { display: block; width: 100%; height: auto; }
.stage .tabs { display: flex; border-top: 1px solid var(--ink); }
.stage .tabs button { flex: 1; padding: 9px 4px; border: 0; border-right: 1px solid var(--line); background: none; cursor: pointer; font-size: 12.5px; color: var(--ink2); }
.stage .tabs button:last-child { border-right: 0; }
.stage .tabs button.on { background: var(--ink); color: var(--paper); }
section.blk { padding: 72px 0; border-top: 1px solid var(--ink); }
.head { display: grid; grid-template-columns: 90px 1fr; gap: 0 24px; margin-bottom: 40px; }
.head .no { font: 12px var(--mono); color: var(--warm); letter-spacing: .15em; padding-top: 14px; }
.head h2 { font: 700 clamp(28px, 3.4vw, 44px)/1.25 var(--serif); margin: 0 0 10px; text-wrap: balance; }
.head p { grid-column: 2; margin: 0; color: var(--ink2); max-width: 40em; font-size: 16px; }
.gallery { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.gallery figure { margin: 0; border: 1px solid var(--ink); background: var(--paper); cursor: zoom-in; transition: transform .15s, box-shadow .15s; }
.gallery figure:hover { transform: translate(-3px, -3px); box-shadow: 6px 6px 0 var(--ink); }
.gallery svg { display: block; width: 100%; height: auto; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--ink); background: var(--card); }
.steps div { padding: 28px 28px 32px; border-right: 1px solid var(--ink); }
.steps div:last-child { border-right: 0; }
.steps b { display: block; font: 700 22px var(--serif); margin: 10px 0 8px; }
.steps p, .rules p { margin: 0; color: var(--ink2); }
.rules { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; border-top: 1px solid var(--line); }
.rules div { padding: 24px 28px 26px 0; border-bottom: 1px solid var(--line); }
.rules div:nth-child(odd) { border-right: 1px solid var(--line); }
.rules div:nth-child(even) { padding-left: 28px; }
.rules b { display: block; font: 700 19px var(--serif); margin: 6px 0; }
.faq details { border-bottom: 1px solid var(--line); padding: 16px 0; }
.faq summary { cursor: pointer; font: 700 18px var(--serif); list-style: none; display: flex; justify-content: space-between; gap: 20px; }
.faq summary::after { content: '+'; font: 20px var(--mono); color: var(--warm); }
.faq details[open] summary::after { content: '–'; }
.faq p { margin: 10px 0 0; color: var(--ink2); max-width: 46em; }
.end { text-align: center; padding: 88px 0 96px; border-top: 1px solid var(--ink); }
.end h2 { font: 700 clamp(34px, 5vw, 60px)/1.2 var(--serif); margin: 0 0 14px; }
.end p { color: var(--ink2); margin: 0 0 28px; }
footer.foot { border-top: 1px solid var(--ink); padding: 20px 40px; display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; color: var(--ink2); font-size: 12.5px; }
.zoom { position: fixed; inset: 0; z-index: 2000; background: rgba(29, 28, 26, .72); display: none; align-items: center; justify-content: center; padding: 24px; cursor: zoom-out; }
.zoom.on { display: flex; }
.zoom svg { max-width: 100%; max-height: 100%; width: auto; height: calc(100vh - 48px); box-shadow: 0 10px 50px rgba(0, 0, 0, .4); }

/* ---------- 工具 ---------- */
body.app { height: 100vh; overflow: hidden; display: flex; flex-direction: column; background-image: none; }
.bar { display: flex; align-items: center; gap: 24px; padding: 10px 18px; border-bottom: 1px solid var(--ink); flex: none; }
.vtabs { display: flex; border: 1px solid var(--ink); border-radius: 2px; overflow: hidden; }
.vtabs button { border: 0; background: none; padding: 6px 18px; cursor: pointer; border-right: 1px solid var(--ink); }
.vtabs button:last-child { border-right: 0; }
.vtabs button.on { background: var(--ink); color: var(--paper); }
.bar .sp { margin-left: auto; display: flex; align-items: center; gap: 12px; font-size: 13px; }
.bar select { border: 1px solid var(--ink); background: var(--card); padding: 5px 8px; border-radius: 2px; }
.work { flex: 1; display: flex; min-height: 0; }
.panel { width: 330px; flex: none; border-right: 1px solid var(--ink); display: flex; flex-direction: column; background: var(--card); }
.panel .scroll { flex: 1; overflow: auto; padding: 4px 18px 18px; }
.panel h3 { font: 700 17px var(--serif); margin: 20px 0 10px; display: flex; align-items: baseline; gap: 10px; }
.panel h3 span { font: 11px var(--mono); color: var(--warm); letter-spacing: .12em; }
.panel h3 small { margin-left: auto; font: 12px var(--sans); color: var(--ink2); }
.panel h3 small a { cursor: pointer; text-decoration: underline; margin-left: 8px; }
.field { display: flex; border: 1px solid var(--ink); background: var(--paper); border-radius: 2px; }
.field input { flex: 1; min-width: 0; border: 0; background: none; padding: 8px 10px; outline: none; }
.field .btn { border-radius: 0; margin: -1px; padding: 8px 14px; }
#results { list-style: none; margin: 6px 0 0; padding: 0; border: 1px solid var(--line); display: none; max-height: 190px; overflow: auto; background: var(--paper); }
#results li { padding: 7px 10px; border-bottom: 1px solid var(--line); cursor: pointer; font-size: 13px; line-height: 1.45; }
#results li:hover { background: var(--paper2); }
.row { display: flex; align-items: center; gap: 10px; margin-top: 10px; font-size: 13px; }
.row label { color: var(--ink2); flex: none; width: 4em; }
.row input[type=text] { flex: 1; min-width: 0; border: 0; border-bottom: 1px solid var(--ink); background: none; padding: 3px 2px; outline: none; }
.row input[type=range] { flex: 1; accent-color: var(--accent); }
.row output { font: 12px var(--mono); width: 5em; text-align: right; }
.seg { display: flex; border: 1px solid var(--ink); border-radius: 2px; overflow: hidden; }
.seg button { border: 0; background: none; padding: 4px 14px; cursor: pointer; font-size: 13px; }
.seg button.on { background: var(--ink); color: var(--paper); }
#coord { font: 11.5px var(--mono); color: var(--ink2); margin-top: 8px; }
.grp { font: 11px var(--mono); letter-spacing: .15em; color: var(--ink2); margin: 12px 0 4px; }
.pick { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.pick label { display: flex; align-items: center; gap: 7px; padding: 6px 9px; border: 1px solid var(--line); cursor: pointer; font-size: 13.5px; border-radius: 2px; user-select: none; }
.pick label:has(input:checked) { border-color: var(--ink); background: var(--paper); }
.pick input { accent-color: var(--accent); margin: 0; }
.panel .act { padding: 14px 18px 16px; border-top: 1px solid var(--ink); }
.panel .act .btn { width: 100%; padding: 12px; font-size: 16px; }
#status { font-size: 12.5px; color: var(--ink2); margin-top: 8px; min-height: 1.6em; line-height: 1.5; }
#status.err { color: var(--warm); }
.main { flex: 1; min-width: 0; position: relative; }
.view { position: absolute; inset: 0; display: none; }
.view.on { display: block; }
#map { position: absolute; inset: 0; background: var(--paper2); }
.hint { position: absolute; z-index: 500; left: 50%; bottom: 22px; transform: translateX(-50%); background: var(--ink); color: var(--paper); padding: 7px 16px; font-size: 13px; border-radius: 2px; pointer-events: none; white-space: nowrap; }
.leaflet-container { font-family: var(--sans); }
.leaflet-tile-pane { filter: grayscale(.8) sepia(.18) contrast(.95); }
#view-sheets, #view-board { overflow: auto; padding: 0 24px 40px; }
.tool { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 10px; padding: 14px 0; background: var(--paper); border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.tool b { font: 700 18px var(--serif); margin-right: auto; }
.sheets { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.card { margin: 0; border: 1px solid var(--ink); background: var(--card); }
.card .sv { cursor: zoom-in; border-bottom: 1px solid var(--ink); }
.card svg, #board svg { display: block; width: 100%; height: auto; }
.card figcaption { display: flex; align-items: center; gap: 6px; padding: 7px 9px; font-size: 13px; }
.card figcaption span { margin-right: auto; }
#board { border: 1px solid var(--ink); max-width: 1500px; margin: 0 auto; }
.empty { padding: 90px 20px; text-align: center; color: var(--ink2); }
.empty b { display: block; font: 700 24px var(--serif); color: var(--ink); margin-bottom: 8px; }

@media (max-width: 900px) {
  .wrap { padding: 0 16px; } .nav { padding: 12px 16px; gap: 14px; } .nav nav a:not(.btn) { display: none; }
  .hero { grid-template-columns: 1fr; gap: 36px; padding: 40px 0 48px; }
  .head { grid-template-columns: 1fr; } .head p { grid-column: 1; }
  .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .steps, .rules { grid-template-columns: 1fr; } .steps div { border-right: 0; border-bottom: 1px solid var(--ink); } .steps div:last-child { border-bottom: 0; }
  .rules div, .rules div:nth-child(even) { padding: 20px 0; border-right: 0 !important; }
  section.blk { padding: 48px 0; } footer.foot { padding: 16px; }
  body.app { height: auto; overflow: auto; } .work { flex-direction: column; } .panel { width: auto; border-right: 0; border-bottom: 1px solid var(--ink); }
  .main { height: 80vh; flex: none; } .bar { flex-wrap: wrap; gap: 10px; }
}