:root {
  --bg: #fbfcfd;
  --panel: #ffffff;
  --ink: #131b23;
  --ink-soft: #55656f;
  --ink-faint: #8b9aa3;
  --line: #e4eaee;
  --line-soft: #eef2f5;
  --accent: #0d7f72;
  --accent-soft: #e6f5f1;
  --warn: #9a6b1e;
  --sans: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "SF Mono", "Cascadia Mono", Consolas, monospace;
  --shadow: 0 1px 2px rgba(19, 27, 35, .04), 0 12px 28px rgba(19, 27, 35, .05);
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 15px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
.shell { width: min(100% - 40px, 1180px); margin-inline: auto; }
h1, h2, h3 { margin: 0; letter-spacing: -.02em; }
code { font: 500 .88em var(--mono); background: var(--accent-soft); color: var(--accent); padding: 1px 5px; border-radius: 4px; }

/* ---------- topbar ---------- */
.topbar { position: sticky; top: 0; z-index: 20; background: rgba(251,252,253,.88); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; gap: 28px; height: 58px; }
.brand { display: inline-flex; align-items: baseline; gap: 8px; font-weight: 700; font-size: 15px; color: var(--ink); text-decoration: none; }
.brand em { font: 500 10px var(--mono); letter-spacing: .12em; color: var(--ink-faint); font-style: normal; }
.brand-mark { width: 9px; height: 9px; border-radius: 2px; background: var(--accent); align-self: center; }
.topbar nav { display: flex; gap: 18px; margin-right: auto; }
.topbar nav a { color: var(--ink-soft); text-decoration: none; font-size: 13px; }
.topbar nav a:hover { color: var(--accent); }
.topbar-meta { display: inline-flex; align-items: center; gap: 7px; font: 10px var(--mono); color: var(--ink-faint); }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.dot.stale { background: #d08c2a; }
.dot.bad { background: #c0504d; }

/* ---------- hero ---------- */
.hero { padding: 52px 0 40px; max-width: 760px; }
.hero h1 { font-size: 40px; line-height: 1.12; letter-spacing: -.035em; }
.hero-sub { font-size: 24px; line-height: 1.3; letter-spacing: -.02em; font-weight: 600; margin: 14px 0 0; color: var(--ink); }
.hero-sub em { font-style: normal; color: var(--accent); }
.lede { color: var(--ink-soft); font-size: 15px; margin: 16px 0 0; }
.stat-row { display: flex; flex-wrap: wrap; gap: 36px; margin-top: 30px; }
.stat b { display: block; font-size: 28px; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.stat span { font: 10px var(--mono); letter-spacing: .1em; color: var(--ink-faint); text-transform: uppercase; }

/* ---------- panels ---------- */
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); margin-bottom: 26px; overflow: hidden; }
.panel-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; flex-wrap: wrap; padding: 22px 24px; border-bottom: 1px solid var(--line-soft); }
.panel-head h2 { font-size: 19px; }
.panel-head p { margin: 6px 0 0; color: var(--ink-faint); font-size: 12.5px; max-width: 62ch; }

/* ---------- controls ---------- */
.controls { display: flex; flex-wrap: wrap; gap: 8px 14px; }
.seg { display: inline-flex; align-items: center; gap: 2px; padding: 3px; border: 1px solid var(--line); border-radius: 8px; background: #fafcfc; }
.seg > span { font: 9px var(--mono); letter-spacing: .1em; color: var(--ink-faint); padding: 0 7px; text-transform: uppercase; }
.seg button { border: 1px solid transparent; background: none; border-radius: 6px; padding: 5px 10px; font: 12px var(--sans); color: var(--ink-soft); cursor: pointer; }
.seg button:hover { color: var(--ink); }
.seg button.on { background: var(--accent-soft); border-color: #bfe2da; color: var(--accent); font-weight: 600; }

.filters { display: flex; align-items: center; flex-wrap: wrap; gap: 10px 18px; padding: 13px 24px; border-bottom: 1px solid var(--line-soft); background: #fafcfd; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: #fff; border-radius: 20px; padding: 4px 11px; font-size: 11.5px; color: var(--ink-soft); cursor: pointer; }
.chip i { width: 7px; height: 7px; border-radius: 50%; }
.chip.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.chip.off { opacity: .42; }
.check { display: inline-flex; align-items: center; gap: 6px; font-size: 11.5px; color: var(--ink-soft); cursor: pointer; }
.check input { accent-color: var(--accent); width: 13px; height: 13px; }

/* ---------- chart ---------- */
.stage { position: relative; padding: 10px 14px 0; overflow-x: auto; }
#scatter { display: block; width: 100%; min-width: 760px; height: auto; overflow: visible; }
.grid { stroke: #eaf0f2; stroke-width: 1; }
.grid.minor { stroke-dasharray: 2 5; }
.axis-label { fill: #93a3ab; font: 10px var(--mono); }
.axis-title { fill: #67767f; font: 10px var(--mono); letter-spacing: .04em; }
.ladder { stroke-width: 5; stroke-linecap: round; stroke-linejoin: round; opacity: .2; }
/* 客户端编排档位：向上开口，表示其上还有一档但高度未知 */
.ladder-open { stroke-width: 1.4; opacity: .5; stroke-dasharray: 3 3; }
.ladder-cap { stroke-width: 1.6; opacity: .65; stroke-linecap: round; stroke-linejoin: round; }
.open-mark { cursor: help; outline: none; }
.open-mark .ladder-cap { transition: opacity .12s; }
.open-mark:hover .ladder-cap, .open-mark:focus .ladder-cap { opacity: 1; }

/* 十字准线 */
#scatter { cursor: crosshair; }
.cross { stroke: #131b23; stroke-width: 1; stroke-dasharray: 4 3; opacity: .55; }
.cross-dot { fill: #131b23; opacity: .7; }
.cross-chip { fill: #131b23; opacity: .92; }
.cross-text { fill: #fff; font: 600 10px var(--mono); }
.pt { cursor: pointer; }
.pt circle { transition: r .12s; }
.pt:hover .halo, .pt:focus .halo, .pt.sel .halo { opacity: .3; }
.halo { opacity: 0; }
.pt-label { font: 600 9.5px var(--sans); pointer-events: none; }
.model-tag { font: 600 10px var(--sans); pointer-events: none; }

.tip { position: absolute; z-index: 5; width: 246px; padding: 11px 13px; border-radius: 9px; background: #131b23; color: #fff; box-shadow: 0 14px 32px rgba(19,27,35,.22); opacity: 0; pointer-events: none; transform: translateY(4px); transition: opacity .12s, transform .12s; }
.tip.on { opacity: 1; transform: translateY(0); }
.tip b { display: block; font-size: 13px; margin-bottom: 5px; }
.tip .row { display: flex; justify-content: space-between; gap: 12px; font-size: 11px; color: #c3d2d7; line-height: 1.8; }
.tip .row span:last-child { color: #fff; font-family: var(--mono); }
.tip small { display: block; margin-top: 7px; padding-top: 6px; border-top: 1px solid rgba(255,255,255,.14); color: #7fcfc2; font: 9.5px var(--mono); }

.chart-foot { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin: 0; padding: 13px 24px; border-top: 1px solid var(--line-soft); font: 10px var(--mono); color: var(--ink-faint); }
.legend { display: flex; flex-wrap: wrap; gap: 11px; margin-left: auto; }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.legend i { width: 7px; height: 7px; border-radius: 50%; }

/* ---------- ladder cards ---------- */
.ladder-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; padding: 20px 24px 24px; }
.lcard { border: 1px solid var(--line); border-radius: 10px; padding: 15px 16px; background: #fdfefe; }
.lcard-head { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.lcard-head i { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.lcard-head b { font-size: 13.5px; }
.lcard-head small { margin-left: auto; font: 9.5px var(--mono); color: var(--ink-faint); }
.lbar { position: relative; height: 5px; border-radius: 3px; background: var(--line-soft); margin: 14px 0 9px; }
.lbar i { position: absolute; top: 0; bottom: 0; border-radius: 3px; }
.lrange { display: flex; justify-content: space-between; font: 10px var(--mono); color: var(--ink-faint); }
.lrange b { color: var(--ink); }
.lcost { margin-top: 7px; font: 10px var(--mono); color: var(--ink-faint); }
.lcost b { color: var(--ink-soft); }
.lgain { margin-top: 11px; padding-top: 10px; border-top: 1px dashed var(--line); font-size: 11.5px; color: var(--ink-soft); }
.lgain b { color: var(--accent); font-variant-numeric: tabular-nums; }

/* ---------- table ---------- */
.search input { border: 1px solid var(--line); border-radius: 7px; padding: 7px 11px; font: 12.5px var(--sans); min-width: 210px; color: var(--ink); }
.search input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; min-width: 720px; }
th, td { text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--line-soft); font-size: 12.5px; }
th { font: 600 10px var(--mono); letter-spacing: .07em; color: var(--ink-faint); text-transform: uppercase; cursor: pointer; user-select: none; white-space: nowrap; background: #fafcfd; position: sticky; top: 0; }
th:hover { color: var(--accent); }
th.num, td.num { text-align: right; font-variant-numeric: tabular-nums; }
tbody tr:hover { background: #f7fbfb; }
td.model { font-weight: 600; }
td.model i { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 7px; }
td.model small { display: block; font-weight: 400; color: var(--ink-faint); font-size: 10.5px; margin-left: 14px; }
.tier-badge { display: inline-block; padding: 2px 8px; border-radius: 5px; background: var(--accent-soft); color: var(--accent); font: 500 11px var(--mono); }
.tier-badge.plain { background: #f2f5f7; color: var(--ink-soft); }
.tier-badge.client { background: #f0edfb; color: #5b52d8; }
.est { color: var(--warn); font-size: 10px; margin-left: 4px; }
.na { color: var(--ink-faint); font-size: 11px; font-style: italic; }
.cell-sub { display: block; margin-top: 3px; font-size: 9.5px; color: var(--ink-faint); }
tr.row-client td { background: #fcfbff; }
.lclient { margin: 9px 0 0; padding-top: 8px; border-top: 1px dashed var(--line); font-size: 11px; color: var(--ink-faint); line-height: 1.6; }
.lclient b { color: #5b52d8; }
.table-foot { margin: 0; padding: 12px 24px; border-top: 1px solid var(--line-soft); font: 10px var(--mono); color: var(--ink-faint); }

/* ---------- method ---------- */
.method-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2px; background: var(--line-soft); }
.method-grid article { background: var(--panel); padding: 22px 24px; }
.method-grid b { font: 600 10px var(--mono); color: var(--accent); letter-spacing: .1em; }
.method-grid h3 { font-size: 14.5px; margin: 9px 0 8px; }
.method-grid p { margin: 0; color: var(--ink-soft); font-size: 12.5px; line-height: 1.75; }
.sources { padding: 18px 24px; border-top: 1px solid var(--line-soft); background: #fafcfd; display: grid; gap: 7px; font-size: 11.5px; color: var(--ink-soft); }
.sources a { color: var(--accent); }

.foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; padding: 26px 0 44px; font: 10px var(--mono); color: var(--ink-faint); }

@media (max-width: 760px) {
  .hero h1 { font-size: 29px; }
  .hero-sub { font-size: 18px; margin-top: 10px; }
  /* 窄屏顶栏优先保证导航可点，品牌的英文副名先让位 */
  .brand em { display: none; }
  .panel-head { padding: 18px; }
  .filters, .chart-foot, .table-foot { padding-inline: 18px; }
  .stat-row { gap: 24px; }
  .legend { margin-left: 0; }
}