/* Scene Flow Challenge leaderboard. No external fonts or scripts (CSP: self only). */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #151a21;
  --muted: #5d6675;
  --border: #e2e6ec;
  --border-strong: #cfd5de;
  --accent: #1b55a8;
  --accent-hover: #164787;
  --accent-weak: #e9f0fb;
  --accent-text: #ffffff;
  --best: #0a7a4a;
  --best-bg: #e6f5ed;
  --warn: #9a5700;
  --warn-bg: #fff3dc;
  --danger: #b3261e;
  --danger-bg: #fdecea;
  --ok: #0a7a4a;
  --ok-bg: #e6f5ed;
  --info-bg: #e9f0fb;
  --unsup: #6a3fbf;
  --unsup-bg: #f1ebfc;
  --code-bg: #f3f5f8;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .07);
  --radius: 10px;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1216;
    --surface: #161a20;
    --surface-2: #1d222a;
    --text: #e7eaef;
    --muted: #9aa4b2;
    --border: #2a3039;
    --border-strong: #39414c;
    --accent: #7aa7ec;
    --accent-hover: #9bbdf2;
    --accent-weak: #1b2638;
    --accent-text: #0f1216;
    --best: #5fd39a;
    --best-bg: #13281e;
    --warn: #f0b45c;
    --warn-bg: #2d2214;
    --danger: #f28b82;
    --danger-bg: #2f1a19;
    --ok: #5fd39a;
    --ok-bg: #13281e;
    --info-bg: #1b2638;
    --unsup: #b99af0;
    --unsup-bg: #251d36;
    --code-bg: #1d222a;
    --shadow: none;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0f1216; --surface: #161a20; --surface-2: #1d222a; --text: #e7eaef; --muted: #9aa4b2;
  --border: #2a3039; --border-strong: #39414c; --accent: #7aa7ec; --accent-hover: #9bbdf2;
  --accent-weak: #1b2638; --accent-text: #0f1216; --best: #5fd39a; --best-bg: #13281e; --warn: #f0b45c;
  --warn-bg: #2d2214; --danger: #f28b82; --danger-bg: #2f1a19; --ok: #5fd39a; --ok-bg: #13281e;
  --info-bg: #1b2638; --unsup: #b99af0; --unsup-bg: #251d36; --code-bg: #1d222a; --shadow: none;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: 1.75rem; letter-spacing: -.01em; }
h2 { font-size: 1.3rem; margin-top: 1.6em; }
h3 { font-size: 1.08rem; margin-top: 1.3em; }
h4 { font-size: .95rem; }
p { margin: 0 0 .9em; }
code, pre, kbd { font-family: var(--mono); font-size: .88em; }
code { background: var(--code-bg); padding: .1em .35em; border-radius: 5px; }
pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px;
  padding: .85em 1em; overflow-x: auto; line-height: 1.45; margin: 0 0 1em;
}
pre code { background: none; padding: 0; }
hr { border: 0; border-top: 1px solid var(--border); margin: 1.5em 0; }
[hidden] { display: none !important; }

.wrap { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 16px; }
main.wrap { flex: 1; padding-top: 28px; padding-bottom: 40px; }
.narrow { max-width: 460px; margin: 0 auto; }
.medium { max-width: 820px; }
.muted { color: var(--muted); }
.small { font-size: .86rem; }
.mono { font-family: var(--mono); }
.nowrap { white-space: nowrap; }
.mt { margin-top: 14px; }

/* ------------------------------------------------------------------ top bar */
.topbar { background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10; }
.topbar .wrap { display: flex; align-items: center; gap: 12px 20px; min-height: 58px; flex-wrap: wrap; padding-top: 8px; padding-bottom: 8px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; color: var(--text); letter-spacing: -.01em; }
.brand:hover { text-decoration: none; color: var(--text); }
.brand img { display: block; }
.topbar nav { display: flex; align-items: center; gap: 4px 6px; flex-wrap: wrap; margin-left: auto; }
.topbar nav a, .linklike {
  color: var(--muted); padding: 6px 10px; border-radius: 7px; font: inherit; font-size: .93rem;
  background: none; border: 0; cursor: pointer;
}
.topbar nav a:hover, .linklike:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.topbar nav a.active { color: var(--text); background: var(--surface-2); font-weight: 600; }
form.inline { display: inline; margin: 0; }

/* ------------------------------------------------------------------ buttons and forms */
.btn, button.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-weight: 600; font-size: .93rem; line-height: 1;
  padding: 10px 16px; border-radius: 8px; border: 1px solid var(--accent);
  background: var(--accent); color: var(--accent-text); cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-text); text-decoration: none; }
.btn.secondary { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn.secondary:hover { background: var(--surface-2); }
.btn.danger { background: var(--surface); color: var(--danger); border-color: var(--border-strong); }
.btn.danger:hover { background: var(--danger-bg); }
.btn.small { padding: 7px 11px; font-size: .86rem; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.topbar nav a.btn { color: var(--accent-text); background: var(--accent); padding: 8px 13px; margin-left: 4px; }
.topbar nav a.btn:hover { background: var(--accent-hover); color: var(--accent-text); }

label { display: block; font-weight: 600; font-size: .9rem; margin: 0 0 6px; }
.field { margin-bottom: 16px; }
.field .hint { font-weight: 400; color: var(--muted); font-size: .84rem; margin-top: 5px; }
input[type=text], input[type=email], input[type=password], input[type=url], textarea, select {
  width: 100%; font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border-strong); border-radius: 8px; padding: 9px 11px;
}
textarea { min-height: 90px; resize: vertical; }
input:focus, textarea:focus, select:focus, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
.check { display: flex; gap: 9px; align-items: flex-start; font-weight: 500; margin-bottom: 10px; }
.check input { margin-top: 4px; }
.check span small { display: block; color: var(--muted); font-weight: 400; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* ------------------------------------------------------------------ cards, flashes, badges */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px; margin-bottom: 18px;
}
.card h2:first-child, .card h3:first-child { margin-top: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.flash { padding: 11px 14px; border-radius: 8px; margin-bottom: 16px; background: var(--info-bg); border: 1px solid var(--border); }
.flash.success { background: var(--ok-bg); }
.flash.error { background: var(--danger-bg); color: var(--danger); }
.flash.warn { background: var(--warn-bg); color: var(--warn); }
.alert { padding: 11px 14px; border-radius: 8px; margin-bottom: 16px; background: var(--danger-bg); color: var(--danger); }
.notice { padding: 12px 14px; border-radius: 8px; margin-bottom: 16px; background: var(--warn-bg); color: var(--warn); }
.badge {
  display: inline-block; font-size: .72rem; font-weight: 650; letter-spacing: .02em;
  padding: 2px 7px; border-radius: 999px; vertical-align: 1px; white-space: nowrap;
  background: var(--surface-2); color: var(--muted);
}
.badge.unsup { background: var(--unsup-bg); color: var(--unsup); }
.badge.sup { background: var(--surface-2); color: var(--muted); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.data-single { background: var(--info-bg); color: var(--accent); }
.badge.data-multi { background: var(--ok-bg); color: var(--ok); }
fieldset.radio-group { border: 0; padding: 0; margin: 0 0 14px; }
fieldset.radio-group legend { font-weight: 600; margin-bottom: 6px; padding: 0; }
.detail-meta { margin: 0 0 12px; font-size: .88rem; color: var(--muted); }
.detail-meta strong { color: var(--text); }
.badge.archived { background: var(--surface-2); color: var(--muted); }
.status { font-size: .78rem; font-weight: 650; padding: 3px 8px; border-radius: 999px; white-space: nowrap; }
.status.done { background: var(--ok-bg); color: var(--ok); }
.status.queued, .status.validating, .status.running { background: var(--info-bg); color: var(--accent); }
.status.failed, .status.rejected { background: var(--danger-bg); color: var(--danger); }
.status.deleted { background: var(--surface-2); color: var(--muted); }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 8px 18px; margin: 0 0 4px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; overflow-wrap: anywhere; }

/* ------------------------------------------------------------------ leaderboard */
.hero { margin-bottom: 18px; }
.hero h1 { margin-bottom: 6px; }
.lede { color: var(--muted); max-width: 820px; margin: 0; }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center; margin: 18px 0 12px; }
.seg { display: inline-flex; border: 1px solid var(--border-strong); border-radius: 8px; overflow: hidden; background: var(--surface); }
.seg a { padding: 7px 12px; color: var(--muted); font-size: .88rem; font-weight: 550; border-right: 1px solid var(--border); }
.seg a:last-child { border-right: 0; }
.seg a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.seg a.on { background: var(--accent-weak); color: var(--accent); }
.toolbar .count { margin-left: auto; font-size: .88rem; }
.seg a .n { display: inline-block; min-width: 1.5em; margin-left: 4px; padding: 0 5px; border-radius: 999px; font-size: .75rem; text-align: center; background: var(--surface-2); color: var(--muted); }
.seg a.on .n { background: var(--surface); color: var(--accent); }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
table { border-collapse: collapse; width: 100%; }
th, td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { font-size: .78rem; font-weight: 650; color: var(--muted); text-transform: none; white-space: nowrap; background: var(--surface-2); }
tbody tr:last-child > td { border-bottom: 0; }
td.num, th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
th.num { font-family: var(--sans); }

table.lb { min-width: 900px; }
table.lb th, table.lb td { padding: 8px 10px; }
table.lb td.num { font-size: .9rem; }
table.lb td.rank, table.lb th.rank { width: 44px; text-align: center; color: var(--muted); font-variant-numeric: tabular-nums; }
table.lb tr.entry:hover > td { background: var(--surface-2); }
table.lb td.method { min-width: 190px; max-width: 280px; }
table.lb td.method a.name { color: var(--text); font-weight: 600; }
table.lb td.method a.name:hover { color: var(--accent); }
table.lb td.method .meta { display: flex; gap: 4px 8px; flex-wrap: wrap; align-items: center; margin-top: 2px; }
a.ext { font-size: .8rem; }
table.lb td.team { color: var(--muted); white-space: nowrap; }
table.lb td.primary { font-weight: 700; }
table.lb th.primary { color: var(--text); }
td.best { color: var(--best); font-weight: 700; }
td.primary.best { background: var(--best-bg); }
.rng { font-weight: 500; color: var(--muted); }
table.lb th .rng { display: block; font-size: .72rem; }
table.lb td.team { max-width: 160px; overflow-wrap: anywhere; white-space: normal; }
td.date { color: var(--muted); white-space: nowrap; font-size: .85rem; }
button.toggle {
  font: inherit; font-size: .76rem; font-weight: 600; color: var(--accent); background: none;
  border: 1px solid var(--border-strong); border-radius: 999px; padding: 1px 8px; cursor: pointer; white-space: nowrap;
}
button.toggle:hover { background: var(--accent-weak); }
button.toggle[aria-expanded="true"] { background: var(--accent-weak); border-color: var(--accent); }
tr.details > td { background: var(--bg); padding: 16px; }
.empty { padding: 30px; text-align: center; color: var(--muted); }
.legend { margin-top: 12px; font-size: .84rem; color: var(--muted); }

/* ------------------------------------------------------------------ detail tables */
.notes { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 10px 13px; margin-bottom: 14px; }
.notes .label { font-size: .75rem; font-weight: 650; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.notes p { margin: 4px 0 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.detail-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
.detail-grid > div { min-width: 0; }
@media (min-width: 1180px) { .detail-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
.detail-grid h4 { margin: 0 0 8px; }
table.metrics { min-width: 480px; font-size: .8rem; }
table.metrics th, table.metrics td { padding: 5px 6px; }
table.metrics td:first-child { min-width: 112px; padding-left: 9px; }
tr.details > td .table-wrap { box-shadow: none; }
table.metrics tr.key td { font-weight: 700; }
table.metrics td.overall { background: var(--accent-weak); }
table.metrics tr.sep td { border-top: 2px solid var(--border-strong); }
.note-text { white-space: pre-wrap; overflow-wrap: anywhere; max-width: 420px; margin-top: 4px; }
.long-hidden { align-self: start; border: 1px dashed var(--border-strong); border-radius: 8px; padding: 14px 16px; color: var(--muted); font-size: .85rem; }
.long-toggle { margin: 4px 0 18px; }
.long-toggle .hint { flex-basis: 100%; margin: 0; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 16px 0 22px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow); }
.stat .k { font-size: .78rem; color: var(--muted); font-weight: 600; }
.stat .v { font-family: var(--mono); font-size: 1.35rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat.primary .v { color: var(--accent); }

/* ------------------------------------------------------------------ upload */
.dropzone {
  border: 2px dashed var(--border-strong); border-radius: var(--radius); padding: 26px; text-align: center;
  background: var(--surface); cursor: pointer; margin-bottom: 16px;
}
.dropzone.drag { border-color: var(--accent); background: var(--accent-weak); }
.dropzone .file { font-weight: 650; overflow-wrap: anywhere; }
.progress { height: 10px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin: 10px 0 6px; }
.progress > div { height: 100%; width: 0; background: var(--accent); transition: width .25s; }
.keybox { display: flex; gap: 8px; align-items: stretch; }
.keybox code { flex: 1; display: block; padding: 9px 11px; overflow-x: auto; white-space: nowrap; border: 1px solid var(--border-strong); }

/* ------------------------------------------------------------------ admin */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin: 10px 0 18px; flex-wrap: wrap; }
.tabs a { padding: 8px 13px; color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -1px; font-weight: 550; }
.tabs a.on { color: var(--text); border-bottom-color: var(--accent); }
.tabs a:hover { text-decoration: none; color: var(--text); }
table.admin { font-size: .87rem; min-width: 900px; }
table.admin td { vertical-align: top; }
.actions { display: flex; gap: 6px; flex-wrap: wrap; }
details.edit summary { cursor: pointer; color: var(--accent); font-size: .85rem; }
details.edit form { margin-top: 10px; min-width: 280px; }

/* ------------------------------------------------------------------ prose (challenge page) */
.prose { max-width: 860px; }
.prose ul { padding-left: 1.3em; }
.prose li { margin-bottom: .35em; }
.prose table { margin: 0 0 1em; font-size: .9rem; }
.prose .table-wrap { margin-bottom: 1em; }
.gifs { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; margin: 8px 0 22px; }
.gifs img { width: 100%; height: auto; border-radius: 8px; display: block; background: var(--surface-2); }
.toc { display: flex; flex-wrap: wrap; gap: 6px 14px; margin: 0 0 18px; font-size: .9rem; }

/* ------------------------------------------------------------------ footer */
.footer { border-top: 1px solid var(--border); padding-top: 18px; padding-bottom: 28px; color: var(--muted); font-size: .85rem; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.footer a { color: var(--muted); text-decoration: underline; text-decoration-color: var(--border-strong); }

@media (max-width: 640px) {
  h1 { font-size: 1.45rem; }
  .card { padding: 16px; }
  .toolbar .count { margin-left: 0; }
  .topbar nav { margin-left: 0; }
}

/* ------------------------------------------------------------------ v3 additions */
table.lb tr.group td { background: var(--surface-2); color: var(--muted); font-size: .85rem; padding: 10px 12px; border-top: 2px solid var(--border-strong); }
table.lb tr.group td strong { color: var(--text); }
table.lb tr.unranked td.rank { color: var(--muted); }
table.lb td.na { color: var(--muted); font-style: italic; font-size: .82rem; }
.card.start { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px 24px; align-items: center; margin: 18px 0; }
@media (min-width: 820px) { .card.start { grid-template-columns: 200px minmax(0, 1fr); } }
.card.start .logo img { width: 100%; max-width: 200px; height: auto; display: block; }
.card.start p { margin: 0 0 8px; }
.card.start p.row { margin: 0; }
details.more-cites summary { cursor: pointer; font-weight: 600; margin: 8px 0; }
a.badge { text-decoration: none; }
a.badge:hover { text-decoration: none; filter: brightness(.95); box-shadow: inset 0 0 0 1px currentColor; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: 999px; font-size: .85rem; font-weight: 600;
  background: var(--accent-weak); color: var(--accent); border: 1px solid var(--accent); }
.chip:hover { text-decoration: none; filter: brightness(.97); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
button.group-toggle { float: right; margin-left: 12px; font: inherit; font-size: .82rem; font-weight: 600; color: var(--accent); background: var(--surface);
  border: 1px solid var(--border-strong); border-radius: 999px; padding: 2px 12px; cursor: pointer; }
button.group-toggle:hover { background: var(--accent-weak); }