/* Octopus Tariff Lab - tokens follow the dataviz reference palette (validated categorical order,
   neutral chart surfaces). Light/dark are selected steps, not an automatic flip. */
:root {
  color-scheme: light;
  --page: #f9f9f7; --surface: #fcfcfb; --raised: #ffffff;
  --ink: #0b0b0b; --ink2: #52514e; --muted: #898781;
  --grid: #e1e0d9; --axis: #c3c2b7; --border: rgba(11,11,11,.10);
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100; --s5: #e87ba4; --s6: #008300; --s7: #4a3aa7; --s8: #e34948;
  --good: #0ca30c; --good-text: #006300; --warn: #fab219; --serious: #ec835a; --crit: #d03b3b;
  --wash: rgba(11,11,11,.04); --focus: #2a78d6;
  --shadow: 0 1px 2px rgba(11,11,11,.06);
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --raised: #222221;
    --ink: #ffffff; --ink2: #c3c2b7; --muted: #898781;
    --grid: #2c2c2a; --axis: #383835; --border: rgba(255,255,255,.10);
    --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181; --s6: #008300; --s7: #9085e9; --s8: #e66767;
    --good-text: #0ca30c; --wash: rgba(255,255,255,.05); --focus: #3987e5; --shadow: none;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --raised: #222221;
  --ink: #ffffff; --ink2: #c3c2b7; --muted: #898781;
  --grid: #2c2c2a; --axis: #383835; --border: rgba(255,255,255,.10);
  --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181; --s6: #008300; --s7: #9085e9; --s8: #e66767;
  --good-text: #0ca30c; --wash: rgba(255,255,255,.05); --focus: #3987e5; --shadow: none;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
.muted { color: var(--muted); }
.ink2 { color: var(--ink2); }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.01em; }
button, select, input { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 6px; }

/* ---------------------------------------------------------------- header */
.top { position: sticky; top: 0; z-index: 20; background: var(--surface); border-bottom: 1px solid var(--border); }
.top-in { max-width: 1320px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand b { font-size: 16px; display: block; line-height: 1.2; }
.brand span { font-size: 12px; }
.top-r { display: flex; align-items: center; gap: 8px; }
.pill { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--border); background: var(--wash); white-space: nowrap; }
.pill i { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); display: inline-block; }
.pill.real i { background: var(--good); }
.pill.demo i { background: var(--warn); }
.btn { background: var(--ink); color: var(--surface); border: 0; border-radius: 8px; padding: 6px 14px; cursor: pointer; font-weight: 600; white-space: nowrap; }
.btn:hover { opacity: .88; }
.btn:disabled { opacity: .45; cursor: default; }
.btn.ghost { background: transparent; color: var(--ink2); border: 1px solid var(--border); padding: 5px 10px; font-weight: 500; }
.btn.small { padding: 3px 10px; font-size: 12px; }
.banner { padding: 8px 16px; font-size: 13px; text-align: center; border-top: 1px solid var(--border); }
.banner.demo { background: color-mix(in srgb, var(--warn) 22%, var(--surface)); }
.banner.err { background: color-mix(in srgb, var(--crit) 20%, var(--surface)); }
.banner b { font-weight: 600; }

/* ---------------------------------------------------------------- layout */
.wrap { max-width: 1320px; margin: 0 auto; padding: 0 16px 40px; }
.filters { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; padding: 14px 0 10px; font-size: 13px; color: var(--ink2); }
.filters label { display: inline-flex; align-items: center; gap: 8px; }
.filters select { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 5px 8px; max-width: 320px; }
.filters .chk { gap: 6px; }
.tabs { display: flex; gap: 2px; overflow-x: auto; border-bottom: 1px solid var(--border); margin-bottom: 18px; scrollbar-width: thin; }
.tabs button { background: none; border: 0; padding: 9px 14px; color: var(--ink2); cursor: pointer; font-weight: 500; border-bottom: 2px solid transparent; white-space: nowrap; }
.tabs button:hover { color: var(--ink); }
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--ink); }
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 460px), 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; box-shadow: var(--shadow); min-width: 0; }
.card.flat { background: transparent; box-shadow: none; }
.ch { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 8px; }
.ch h3 { font-size: 14px; }
.ch .sub { font-size: 12px; color: var(--muted); margin-top: 2px; max-width: 80ch; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; flex: none; }
.seg button { background: transparent; border: 0; padding: 3px 10px; font-size: 12px; cursor: pointer; color: var(--ink2); }
.seg button[aria-pressed="true"] { background: var(--wash); color: var(--ink); font-weight: 600; box-shadow: inset 0 0 0 1px var(--axis); }
.chart { width: 100%; }
.chart[hidden], .tbl[hidden] { display: none; }
.loading { opacity: .5; transition: opacity .2s; }
.sec { margin: 26px 0 10px; display: flex; align-items: baseline; gap: 10px; }
.sec h2 { font-size: 16px; }
.sec .muted { font-size: 12px; }

/* ---------------------------------------------------------------- figures */
.hero { padding: 22px 22px 20px; }
.hero .eyebrow { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); font-weight: 600; }
.hero .big { font-size: 56px; line-height: 1.05; font-weight: 600; letter-spacing: -.02em; margin: 6px 0 4px; }
.hero .big small { font-size: 18px; font-weight: 500; color: var(--ink2); letter-spacing: 0; margin-left: 8px; }
.hero .lead { font-size: 16px; color: var(--ink); max-width: 70ch; }
.hero .fine { margin-top: 10px; font-size: 12px; color: var(--muted); max-width: 90ch; }
.tile { padding: 14px 16px; }
.tile .l { font-size: 12px; color: var(--muted); }
.tile .v { font-size: 28px; font-weight: 600; letter-spacing: -.01em; margin: 2px 0; }
.tile .d { font-size: 12px; color: var(--ink2); }
.tile.ref { box-shadow: inset 0 0 0 1px var(--axis); }
.good { color: var(--good-text); } .bad { color: var(--crit); }
.badge { display: inline-flex; gap: 4px; align-items: center; font-size: 12px; font-weight: 600; padding: 1px 8px; border-radius: 999px; border: 1px solid currentColor; }
.badge.g { color: var(--good-text); } .badge.b { color: var(--crit); } .badge.n { color: var(--ink2); }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 12px; color: var(--ink2); margin: 2px 0 6px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; cursor: default; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; }
.legend i.ln { height: 2px; width: 14px; border-radius: 1px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 10px; }
.chip { border: 1px solid var(--border); background: var(--surface); border-radius: 999px; padding: 3px 10px; font-size: 12px; cursor: pointer; display: inline-flex; gap: 6px; align-items: center; color: var(--ink2); }
.chip[aria-pressed="true"] { color: var(--ink); border-color: var(--axis); background: var(--wash); font-weight: 600; }
.chip i { width: 10px; height: 2px; background: var(--muted); display: inline-block; }
.chip:disabled { opacity: .4; cursor: default; }

/* ---------------------------------------------------------------- tables */
.tbl { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { text-align: right; padding: 6px 10px; border-bottom: 1px solid var(--grid); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { color: var(--muted); font-weight: 500; font-size: 12px; position: sticky; top: 0; background: var(--surface); }
td.num { font-variant-numeric: tabular-nums; }
td:first-child { white-space: normal; min-width: 120px; }
tr.sel td { background: var(--wash); }
tr.refrow td:first-child { box-shadow: inset 3px 0 0 var(--axis); }
tr.click { cursor: pointer; }
tr.click:hover td { background: var(--wash); }

/* ---------------------------------------------------------------- forms */
.form { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px 18px; }
.form label { display: flex; flex-direction: column; gap: 3px; font-size: 12px; color: var(--muted); }
.form input[type="number"], .form select { background: var(--page); border: 1px solid var(--border); border-radius: 8px; padding: 6px 8px; font-size: 14px; color: var(--ink); }
.form .help { font-size: 11px; color: var(--muted); }
.note { padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border); background: var(--wash); font-size: 13px; color: var(--ink2); }
.note.warn { border-color: var(--warn); }
.note.crit { border-color: var(--crit); }
.note b { color: var(--ink); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; font-size: 13px; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }
.bar { height: 8px; border-radius: 4px; background: color-mix(in srgb, var(--s1) 18%, var(--surface)); overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--s1); }

/* ---------------------------------------------------------------- about page */
.banner a { color: inherit; font-weight: 600; text-underline-offset: 2px; }
.ab-title { font-size: 28px; line-height: 1.2; letter-spacing: -.02em; margin: 6px 0 10px; max-width: 28em; }
.card.ab { scroll-margin-top: 76px; }
.ab-p { margin: 6px 0; color: var(--ink2); max-width: 78ch; }
.ab-p b, .ab-ul b, .ab-tbl b { color: var(--ink); font-weight: 600; }
.ab-ul { margin: 6px 0; padding-left: 20px; color: var(--ink2); max-width: 86ch; }
.ab-ul li { margin: 7px 0; }
details.ab > summary { cursor: pointer; list-style: none; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
details.ab > summary::-webkit-details-marker { display: none; }
details.ab > summary::before { content: "▸"; color: var(--muted); font-size: 12px; width: 12px; transition: transform .15s; }
details.ab[open] > summary::before { transform: rotate(90deg); }
details.ab > summary h3 { font-size: 14px; }
details.ab > summary .sub { font-size: 12px; color: var(--muted); }
details.ab > .ab-body { margin-top: 10px; }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); gap: 12px; }
.step { display: flex; gap: 10px; border: 1px solid var(--border); border-radius: 10px; padding: 12px; background: var(--page); }
.step .n { flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--ink); color: var(--surface); font-size: 12px; font-weight: 700; display: inline-flex; align-items: center; justify-content: center; }
.step b { display: block; margin-bottom: 2px; }
.step .ab-p { margin: 0; font-size: 13px; }
.ab-fig { margin-top: 16px; }
.ab-svg { overflow-x: auto; }
.ab-svg svg { display: block; width: 100%; min-width: 640px; max-width: 780px; height: auto; margin: 0 auto; }
.ab-qa h4 { margin: 0 0 2px; font-size: 13.5px; font-weight: 600; }
.ab-qa .ab-p { margin: 2px 0 8px; font-size: 13px; }
.ab-tab { text-align: left; display: flex; flex-direction: column; gap: 2px; background: var(--page); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; cursor: pointer; color: var(--ink2); }
.ab-tab:hover { border-color: var(--axis); background: var(--wash); }
.ab-tab b { color: var(--ink); } .ab-tab span { font-size: 12.5px; }
.ab-tbl td, .ab-tbl th { white-space: normal; text-align: left; vertical-align: top; }
.ab-tbl td:first-child { min-width: 90px; white-space: nowrap; }

/* ---------------------------------------------------------------- tooltip + progress */
.tip { position: fixed; z-index: 50; pointer-events: none; background: var(--raised); color: var(--ink); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 12px; box-shadow: 0 4px 16px rgba(0,0,0,.25); max-width: 320px; }
.progress { height: 6px; border-radius: 3px; background: var(--grid); overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--s1); transition: width .3s; }
.foot { margin-top: 30px; font-size: 12px; line-height: 1.6; }
.empty { padding: 60px 16px; text-align: center; color: var(--muted); }
.empty b { color: var(--ink); display: block; margin-bottom: 6px; font-size: 16px; }
@media (max-width: 640px) { .hero .big { font-size: 40px; } .tile .v { font-size: 24px; } }
@media (forced-colors: active) { .seg button[aria-pressed="true"] { outline: 2px solid Highlight; } }