:root {
  --bg: #f6f8fa; --card: #ffffff; --text: #0f172a; --muted: #64748b; --line: #e2e8f0;
  --accent: #0d9488; --accent2: #2563eb; --accent-soft: rgba(13,148,136,.1); --err: #dc2626; --radius: 14px;
  --p0: #34d399; --p1: #fcd34d; --p2: #fdba74; --p3: #cbd5e1;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b1120; --card: #131c31; --text: #e8edf7; --muted: #94a3b8; --line: #243049; --accent: #2dd4bf; --accent2: #60a5fa; --accent-soft: rgba(45,212,191,.12);
    --p0: #10b981; --p1: #a16207; --p2: #9a5a1f; --p3: #2a3650; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif; -webkit-font-smoothing: antialiased; }
[hidden] { display: none !important; }
a { color: var(--accent2); text-decoration: none; } a:hover { text-decoration: underline; }
.shell { max-width: 820px; margin: 0 auto; padding: 20px 16px 40px; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; font-size: 20px; letter-spacing: -.02em; }
.brand:hover { text-decoration: none; }
.logo { width: 28px; height: 28px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), var(--accent2)); display: grid; place-items: center; color: #fff; font-size: 15px; font-weight: 800; }
.top nav { display: flex; gap: 14px; font-size: 14px; } .top nav a { color: var(--muted); }
h1 { font-size: clamp(26px, 5vw, 38px); line-height: 1.15; letter-spacing: -.03em; margin: 28px 0 8px; }
.lead { color: var(--muted); margin: 0 0 18px; font-size: 17px; }

.search { position: relative; }
.search input { width: 100%; font: inherit; font-size: 18px; padding: 16px 18px 16px 48px; border-radius: 16px; border: 2px solid var(--line); background: var(--card); color: var(--text); outline: none; box-shadow: 0 4px 24px rgba(15,23,42,.06); transition: border-color .15s; }
.search input:focus { border-color: var(--accent); }
.search svg { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; }
.search kbd { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); font: 12px monospace; border: 1px solid var(--line); border-radius: 6px; padding: 1px 7px; color: var(--muted); }
.examples { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 0; }
.examples a { font-size: 14px; padding: 5px 12px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); color: var(--muted); }
.examples a:hover { border-color: var(--accent); color: var(--text); text-decoration: none; }

.answer-card { margin-top: 14px; padding: 16px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); display: grid; gap: 8px; }
.answer-title { font-weight: 600; color: var(--muted); font-size: 14px; }
.also { display: flex; flex-wrap: wrap; gap: 6px 14px; color: var(--muted); font-size: 14px; }
.open { font-weight: 600; font-size: 14px; justify-self: start; }
.tool-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 8px; }
.tool-hit { display: flex; flex-direction: column; padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line); color: var(--text); }
.tool-hit small { color: var(--muted); } .tool-hit:hover { border-color: var(--accent); text-decoration: none; }

.group-title { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 32px 0 10px; font-weight: 700; }
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.tile { display: flex; align-items: center; gap: 10px; padding: 12px; border-radius: 12px; background: var(--card); border: 1px solid var(--line); color: var(--text); font-weight: 600; font-size: 15px; transition: .15s; }
.tile:hover { border-color: var(--accent); transform: translateY(-1px); text-decoration: none; }
.tile .b { flex: none; min-width: 34px; height: 34px; padding: 0 6px; border-radius: 9px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font-size: 12px; font-weight: 800; }

/* tool UI */
.tool { margin-top: 22px; }
.inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 12px; }
.inputs.three { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 600px) { .inputs, .inputs.three { grid-template-columns: 1fr; } }
.field { display: grid; gap: 4px; min-width: 0; }
.field-label { font-size: 13px; color: var(--muted); font-weight: 600; }
.field-box { display: flex; align-items: center; gap: 6px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 0 12px; }
.field-box:focus-within, select:focus, .picker-input:focus { border-color: var(--accent); outline: none; }
.field-box input { flex: 1; min-width: 0; font: inherit; font-size: 20px; font-weight: 600; padding: 12px 0; background: transparent; border: 0; outline: none; color: var(--text); }
.affix { color: var(--muted); font-weight: 600; }
select { width: 100%; font: inherit; font-size: 16px; color: var(--text); background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 15px 12px; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 4px 0 12px; }
.chip { font: inherit; font-size: 14px; font-weight: 600; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--text); cursor: pointer; }
.chip:hover { border-color: var(--accent); }
.chip.on { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; border-color: transparent; }
.results { display: grid; gap: 8px; margin-top: 12px; }
.results.grid { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.result { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 12px; background: var(--card); border: 1px solid var(--line); cursor: pointer; transition: .12s; }
.result:hover, .result:focus-visible { border-color: var(--accent); outline: none; }
.result-label { color: var(--muted); font-size: 14px; display: flex; flex-direction: column; } .result-label small { font-size: 12px; opacity: .8; }
.result-value { font-weight: 700; font-size: 18px; font-variant-numeric: tabular-nums; text-align: right; word-break: break-word; }
.result.big { padding: 18px; background: linear-gradient(135deg, var(--accent-soft), transparent); border-color: var(--accent); }
.result.big .result-value { font-size: 30px; letter-spacing: -.02em; }
.unit-card.source .result { border-color: var(--accent); background: var(--accent-soft); }
.note { color: var(--muted); font-size: 14px; margin: 10px 0; } .note a { text-decoration: underline; }
.error { color: var(--err); background: rgba(220,38,38,.08); padding: 12px 14px; border-radius: 10px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.card h2 { font-size: 16px; margin: 0 0 12px; }
.stack { display: grid; gap: 14px; }
.row { display: flex; gap: 10px; align-items: center; margin: 10px 0; } .row.wrap { flex-wrap: wrap; }
.btn { font: inherit; font-weight: 600; font-size: 15px; display: inline-block; padding: 10px 18px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--text); cursor: pointer; }
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { border: 0; color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent2)); }
.link { background: none; border: 0; color: var(--accent2); font: inherit; font-size: 14px; cursor: pointer; padding: 6px 0; } .link:hover { text-decoration: underline; }
.filter { font: inherit; padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
.check { display: flex; align-items: center; gap: 8px; font-size: 15px; margin: 6px 0; cursor: pointer; } .check input { width: 18px; height: 18px; accent-color: var(--accent); }
details.more { margin: 10px 0; } details.more summary { cursor: pointer; color: var(--accent2); font-size: 14px; font-weight: 600; margin-bottom: 10px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; font-variant-numeric: tabular-nums; } th, td { padding: 6px 8px; border-bottom: 1px solid var(--line); text-align: right; } th:first-child, td:first-child { text-align: left; }
.swatch { height: 90px; border-radius: 14px; border: 1px solid var(--line); margin: 6px 0 4px; } .swatch.small { height: 44px; margin: 0; }
.picker { position: relative; display: inline-block; } .picker-input { font: inherit; padding: 9px 12px; border-radius: 999px; border: 1px dashed var(--line); background: var(--card); color: var(--text); width: 190px; }
.suggest { position: absolute; z-index: 20; top: 100%; left: 0; min-width: 260px; margin: 6px 0 0; padding: 6px; list-style: none; background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 12px 32px rgba(15,23,42,.16); }
.suggest li { display: flex; justify-content: space-between; gap: 12px; padding: 8px 10px; border-radius: 8px; cursor: pointer; } .suggest li.on, .suggest li:hover { background: var(--accent-soft); } .suggest span { color: var(--muted); font-size: 13px; }
.zone-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.zone-chip { display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 999px; background: var(--accent-soft); font-weight: 600; font-size: 14px; } .zone-chip em { font-weight: 400; color: var(--muted); font-style: normal; }
.zone-chip button { border: 0; background: transparent; color: var(--muted); font-size: 18px; line-height: 1; cursor: pointer; padding: 0 2px; } .zone-chip button:hover { color: var(--err); }
.from-box { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.best { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 10px; }
.best-card { text-align: left; font: inherit; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--text); cursor: pointer; display: grid; gap: 4px; }
.best-card:hover, .best-card.on { border-color: var(--accent); background: var(--accent-soft); }
.best-line { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 8px; font-variant-numeric: tabular-nums; } .best-line b { min-width: 96px; } .best-line small { color: var(--muted); }
#tool h2 { font-size: 18px; margin: 22px 0 4px; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--muted); margin: 14px 0 6px; }
.legend .k::before { content: ""; display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -2px; }
.k.p0::before, .tl-cell.p0 { background: var(--p0); } .k.p1::before, .tl-cell.p1 { background: var(--p1); } .k.p2::before, .tl-cell.p2 { background: var(--p2); } .k.p3::before, .tl-cell.p3 { background: var(--p3); }
.scroll { overflow-x: auto; padding-bottom: 6px; }
.timeline { min-width: 720px; display: grid; gap: 8px; }
.tl-row { display: grid; grid-template-columns: 130px 1fr; gap: 10px; align-items: end; padding-top: 16px; }
.tl-name { display: flex; flex-direction: column; font-size: 14px; line-height: 1.25; } .tl-name small { color: var(--muted); font-size: 12px; }
.tl-cells { display: grid; grid-template-columns: repeat(var(--cols), 1fr); gap: 2px; }
.tl-cell { position: relative; height: 30px; border: 0; padding: 0; cursor: pointer; border-radius: 3px; } .tl-cell i { position: absolute; top: -17px; left: 0; font-style: normal; font-size: 10px; color: var(--muted); white-space: nowrap; pointer-events: none; }
.tl-row:first-child .tl-cell i { display: block; } .tl-cell.sel { outline: 3px solid var(--text); outline-offset: 1px; z-index: 1; } .tl-cell:hover { filter: brightness(1.12); }
.line { margin: 4px 0; font-variant-numeric: tabular-nums; }
.seo { margin-top: 48px; padding-top: 28px; border-top: 1px solid var(--line); } .seo h2 { font-size: 20px; margin: 0 0 10px; } .seo h3 { font-size: 16px; margin: 18px 0 6px; } .seo p, .seo li { color: var(--muted); font-size: 15px; }
.facts { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 4px 20px; padding: 0; list-style: none; margin: 0; } .facts li { padding: 4px 0; border-bottom: 1px solid var(--line); }
.related { display: flex; flex-wrap: wrap; gap: 8px; } .related a { padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); font-size: 14px; }
footer { margin-top: 48px; padding-top: 18px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; font-size: 13px; color: var(--muted); }
#toast { position: fixed; bottom: 24px; left: 50%; transform: translate(-50%, 20px); background: var(--text); color: var(--bg); padding: 8px 16px; border-radius: 10px; font-size: 14px; opacity: 0; pointer-events: none; transition: .2s; z-index: 50; max-width: 90vw; }
#toast.show { opacity: 1; transform: translate(-50%, 0); }
@media (max-width: 560px) { .top nav { display: none; } }