/* 10.24 contest site. One idea carries the look: amber is signal (things you earned, things you can
   act on), steel blue is noise (not yet solved, inactive). Everything else stays quiet. */

@font-face { font-family: "IBM Plex Mono"; src: url("/static/fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("/static/fonts/ibm-plex-mono-latin-400-italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("/static/fonts/ibm-plex-mono-latin-600-normal.woff2") format("woff2"); font-weight: 600; font-style: normal; font-display: swap; }
@font-face { font-family: "VT323"; src: url("/static/fonts/vt323-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }

:root {
  --bg: #16130e;          /* warm black: an amber CRT with the power off */
  --panel: #201b14;       /* raised surfaces: inputs, code */
  --rule: #3a3227;        /* hairlines */
  --rule-soft: #2a241b;
  --text: #e9dfc9;        /* warm paper white */
  --bright: #fff6e0;      /* emphasis inside statements */
  --dim: #9a8f7c;         /* secondary text */
  --signal: #ffb340;      /* amber: earned, links, primary actions */
  --signal-hover: #ffcb75;
  --signal-soft: #c98a2e;
  --signal-wash: rgba(255, 179, 64, 0.08);
  --noise: #4f6475;       /* steel blue: unsolved */
  --noise-soft: #34434f;
  --cool: #8cc6d6;        /* focus, highlights */
  --error: #ff7a63;
  --dark-bit: #3a3125;
  --font-body: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-display: "VT323", "IBM Plex Mono", ui-monospace, monospace;
  --measure: 74ch;
  --gutter: 24px;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); color: var(--text); -webkit-text-size-adjust: 100%; }
body {
  margin: 0 auto;
  max-width: 1120px;
  padding: 0 var(--gutter);
  font: 15px/1.65 var(--font-body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
@media (max-width: 600px) { :root { --gutter: 16px; } body { font-size: 14px; } }

a { color: var(--signal); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--signal-hover); }
:focus-visible { outline: 2px solid var(--cool); outline-offset: 2px; border-radius: 2px; }
code, pre { font-family: var(--font-body); }
h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }
strong { font-weight: 600; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: -9999px; top: 8px; }
.skip:focus { left: 8px; background: var(--panel); padding: 6px 10px; z-index: 10; }
.dim { color: var(--dim); }
.bad { color: var(--error); }
.earned { color: var(--signal); }
.empty { color: var(--dim); }
.inline { display: inline; }

/* ---------------------------------------------------------------- header */

.top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 28px;
  padding: 20px 0 14px;
  border-bottom: 1px solid var(--rule);
}
.mark {
  font: 400 46px/0.9 var(--font-display);
  color: var(--signal);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.mark:hover { color: var(--signal-hover); }
.nav { display: flex; flex-wrap: wrap; gap: 4px 20px; }
.nav a { color: var(--text); text-decoration: none; }
.nav a:hover { color: var(--signal); }
.nav a[aria-current="page"] { color: var(--signal); text-decoration: underline; }
.who { margin-left: auto; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 14px; color: var(--dim); }
.who a { color: var(--text); text-decoration: none; }
.who a:hover { color: var(--signal); }
.my-points { color: var(--signal); font-weight: 600; }
@media (max-width: 700px) { .who { margin-left: 0; width: 100%; } }

.banner { margin: 0; padding: 10px 0; color: var(--dim); border-bottom: 1px solid var(--rule); }
main { padding: 28px 0 72px; min-height: 60vh; }
.foot { border-top: 1px solid var(--rule); color: var(--dim); font-size: 13px; padding: 14px 0 28px; }

/* ---------------------------------------------------------------- messages */

.flash {
  max-width: var(--measure);
  margin: 0 0 18px;
  padding: 10px 14px 10px 38px;
  background: var(--panel);
  border-radius: 4px;
  position: relative;
}
.flash::before { position: absolute; left: 14px; top: 10px; font-weight: 600; }
.flash-good::before { content: "+"; color: var(--signal); }
.flash-bad::before { content: "×"; color: var(--error); }
.flash-wait::before { content: "…"; color: var(--cool); }
.note { color: var(--dim); }

/* ---------------------------------------------------------------- home: the 1024-bit picture */

.home { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 32px 56px; align-items: start; }
@media (max-width: 960px) { .home { grid-template-columns: minmax(0, 1fr); } .listing { order: -1; } }

.signal { margin: 0; }
.bits {
  --cell: 14px;
  display: grid;
  grid-template-columns: repeat(32, var(--cell));
  grid-auto-rows: var(--cell);
  font: 600 calc(var(--cell) * 0.74) / var(--cell) var(--font-body);
  user-select: none;
  cursor: default;
}
.bits i { font-style: normal; text-align: center; transition: color 160ms; }
.bits .n { color: #3c4d5a; }
.bits .b { color: var(--dark-bit); }
.bits .s { color: var(--signal); text-shadow: 0 0 6px rgba(255, 179, 64, 0.45); }
.bits .hl.n { color: var(--cool); }
.bits .hl.b { color: #6b5a40; }
.bits i.fresh { animation: settle 760ms steps(5, end) both; animation-delay: var(--d, 0ms); }
@keyframes settle {
  0% { color: var(--noise); text-shadow: none; }
  40% { color: var(--cool); text-shadow: none; }
  70% { color: var(--noise-soft); text-shadow: none; }
}
@media (prefers-reduced-motion: reduce) { .bits i.fresh { animation: none; } .bits i { transition: none; } }
@media (max-width: 520px) { .bits { --cell: calc((100vw - 2 * var(--gutter)) / 32); } }
.bits-caption { color: var(--dim); max-width: calc(32 * 14px); margin: 14px 0 0; font-size: 13px; }
.bits-caption .count { color: var(--signal); font-weight: 600; }

.clock { font: 400 30px/1.1 var(--font-display); margin: 0 0 18px; color: var(--text); }
.clock .countdown { color: var(--signal); }

.problems { width: 100%; border-collapse: collapse; }
.problems th { color: var(--dim); font-weight: 400; text-align: left; padding: 0 14px 8px 0; border-bottom: 1px solid var(--rule); }
.problems td { padding: 11px 14px 11px 0; border-bottom: 1px solid var(--rule-soft); vertical-align: baseline; }
.problems td.n { color: var(--dim); width: 3ch; }
.problems td.tag { color: var(--dim); white-space: nowrap; }
.problems .title a { color: var(--text); text-decoration: none; }
.problems .title a:hover, .problems tr.active .title a { color: var(--signal); text-decoration: underline; }
.problems .soon { color: var(--dim); font-size: 13px; }
.problems .hidden-title { color: var(--noise); }
.progress { white-space: nowrap; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
th.num { text-align: right; }
.partbits b { font-weight: 600; letter-spacing: 0.08em; }
.partbits .on { color: var(--signal); }
.partbits .off { color: var(--noise); }
.pts { color: var(--dim); margin-left: 12px; }
.total { margin: 18px 0 0; color: var(--dim); }
.total strong { color: var(--signal); }

.news { margin-top: 40px; }
.news h2, .page-head h2 { font: 400 28px/1.1 var(--font-display); color: var(--text); margin: 0 0 10px; }
.news article, .ann { border-top: 1px solid var(--rule-soft); padding: 10px 0; }
.news p, .ann p { margin: 0; white-space: pre-line; }
.when { color: var(--dim); font-size: 13px; }

/* ---------------------------------------------------------------- problem pages */

.problem { max-width: var(--measure); }
.meta { display: flex; flex-wrap: wrap; gap: 4px 20px; color: var(--dim); margin: 0; }
.meta .tag { color: var(--noise); }
.problem-head h1, .page-head h1, .auth h1, .settings h1, .message h1 {
  font: 400 54px/0.95 var(--font-display);
  color: var(--signal);
  margin: 8px 0 26px;
}
@media (max-width: 600px) {
  .problem-head h1, .page-head h1, .auth h1, .settings h1, .message h1 { font-size: 42px; }
}
.part + .part { margin-top: 40px; }
.part h2, .problem h2, .settings h2 {
  font: 400 30px/1.1 var(--font-display);
  color: var(--text);
  margin: 36px 0 12px;
}
.part > h2:first-child { margin-top: 0; }

.statement p, .statement ul, .statement ol { margin: 0 0 1.05em; }
.statement ul, .statement ol { padding-left: 1.5em; }
.statement li + li { margin-top: 0.3em; }
.statement em { font-style: italic; color: var(--bright); }
.statement strong { color: var(--bright); }
.statement blockquote.flavor { margin: 0 0 1.4em; padding: 0.2em 0 0.2em 1em; border-left: 2px solid var(--signal-soft); color: var(--dim); font-style: italic; }
.statement blockquote.flavor p { margin: 0; }
.statement code { background: var(--panel); padding: 0.08em 0.35em; border-radius: 3px; }
.statement pre { background: var(--panel); padding: 14px 16px; overflow-x: auto; line-height: 1.5; border-radius: 4px; margin: 0 0 1.1em; }
.statement pre code { background: none; padding: 0; }
.statement code em { color: var(--signal); font-style: normal; font-weight: 600; }
.statement table { border-collapse: collapse; margin: 0 0 1.1em; display: block; overflow-x: auto; }
.statement th, .statement td { border-bottom: 1px solid var(--rule); padding: 4px 14px 4px 0; text-align: left; }
.statement blockquote { margin: 0 0 1.05em; padding-left: 14px; border-left: 2px solid var(--rule); color: var(--dim); }
.statement h1, .statement h2, .statement h3 { font: 400 30px/1.1 var(--font-display); color: var(--text); margin: 30px 0 10px; }
.statement img { max-width: 100%; height: auto; }

.solved { color: var(--signal); margin: 4px 0 0; }
.solved code { color: var(--text); background: var(--panel); padding: 0.08em 0.35em; border-radius: 3px; }
.answer, .done, .uploads, .files, .scoring, .mini-board, .solution { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--rule); }
.inputs { margin: 0 0 18px; }
.inputs span { color: var(--dim); }
.inputs a { margin-left: 4px; }
.filelist { margin: 0; padding-left: 1.4em; }

/* ---------------------------------------------------------------- forms */

label { display: block; color: var(--dim); margin: 0 0 6px; }
label.check { display: flex; gap: 10px; align-items: baseline; color: var(--text); margin-top: 12px; }
input, textarea, select {
  font: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 9px 12px;
  width: 100%;
  caret-color: var(--signal);
}
input[type="checkbox"] { width: auto; accent-color: var(--signal); }
input[type="file"] { padding: 7px 10px; }
input::file-selector-button { font: inherit; color: var(--text); background: var(--rule); border: 0; border-radius: 3px; padding: 4px 10px; margin-right: 10px; cursor: pointer; }
input:focus, textarea:focus { border-color: var(--signal-soft); }
input::placeholder { color: #6c6455; }
button, .button-like {
  font: inherit;
  font-weight: 600;
  color: var(--bg);
  background: var(--signal);
  border: 0;
  border-radius: 4px;
  padding: 9px 18px;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  display: inline-block;
}
button:hover, .button-like:hover { background: var(--signal-hover); color: var(--bg); }
button:disabled { background: var(--noise-soft); color: var(--dim); cursor: not-allowed; }
button.secondary { background: transparent; color: var(--signal); border: 1px solid var(--signal-soft); }
button.secondary:hover { background: var(--signal-wash); }
button.linkish {
  background: none; color: var(--signal); padding: 0; font-weight: 400;
  text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px;
}
button.linkish:hover { color: var(--signal-hover); background: none; }
button.linkish.danger { color: var(--error); }
.who button.linkish { color: var(--text); text-decoration: none; }
.who button.linkish:hover { color: var(--signal); }
.row { display: flex; gap: 10px; align-items: stretch; }
.row input { flex: 1; min-width: 0; }
@media (max-width: 480px) { .row { flex-direction: column; } .row button { align-self: flex-start; } }
.hint { color: var(--dim); font-size: 13px; margin: 8px 0 0; }
.clock-box { margin: 0 0 28px; }
.start-form { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; }
.check { display: flex; gap: 8px; align-items: center; }
.upload-block + .upload-block { margin-top: 30px; }
.upload-block h3 { font: 400 24px/1.1 var(--font-display); margin: 0 0 4px; }
.upload-block .hint { margin: 0 0 12px; font-size: 14px; line-height: 1.6; }
.model-status { margin: 12px 0 0; }
.answer-form { max-width: 560px; }
.stack { display: flex; flex-direction: column; max-width: 460px; }
.stack label { margin-top: 14px; }
.stack label:first-of-type { margin-top: 0; }
.stack .hint { margin-top: 6px; }
.stack button { margin-top: 20px; align-self: flex-start; }
.two-forms { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px 40px; margin-top: 32px; max-width: 900px; }
.two-forms .stack { max-width: none; }
.search { max-width: 520px; margin-bottom: 18px; }
.flag-row { display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: baseline; padding: 6px 0; border-bottom: 1px solid var(--rule-soft); }

.auth, .settings, .message { max-width: 560px; }
.auth .lede { color: var(--dim); }
.providers { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }
.or { color: var(--dim); margin: 22px 0 14px; }
.settings section { margin-top: 12px; }

/* ---------------------------------------------------------------- tables */

.page-head { max-width: var(--measure); margin-bottom: 22px; }
.page-head .lede { color: var(--dim); margin: 0 0 8px; }
.subnav { display: flex; flex-wrap: wrap; gap: 6px 22px; margin: 6px 0 0; }
.key { margin-left: 14px; white-space: nowrap; }
.key b { font-weight: 600; }
.key .on { color: var(--signal); }
.key .half { color: var(--signal-soft); }

.table-wrap { overflow-x: auto; }
.board, .subs, .stats { width: 100%; border-collapse: collapse; }
.board th, .subs th, .stats th { color: var(--dim); font-weight: 400; text-align: left; padding: 6px 14px 6px 0; border-bottom: 1px solid var(--rule); white-space: nowrap; }
.board td, .subs td, .stats td { padding: 8px 14px 8px 0; border-bottom: 1px solid var(--rule-soft); vertical-align: baseline; }
.board th.num, .subs th.num, .stats th.num { text-align: right; }
.board th:first-child, .board td:first-child, .stats th:first-child, .stats td:first-child { width: 3.5em; }
.board .total { color: var(--signal); font-weight: 600; }
.board .col-p { width: 1%; white-space: nowrap; }
.board .col-p a { color: var(--dim); text-decoration: none; }
.board .name { white-space: nowrap; }
.board .name a { color: var(--text); }
.board.compact td { padding: 5px 14px 5px 0; }
.me-row td { background: var(--signal-wash); }
.avatar { width: 20px; height: 20px; border-radius: 50%; vertical-align: -5px; margin-right: 8px; }
.subs .file { max-width: 18ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.subs .bad-file { color: var(--error); }
.subs .is-final td { background: var(--signal-wash); }
.subs .note-row td { border-bottom: 1px solid var(--rule-soft); padding-top: 0; font-size: 13px; }
.final-mark { color: var(--signal); }
.code { color: var(--signal); background: var(--panel); padding: 0.1em 0.4em; border-radius: 3px; letter-spacing: 0.05em; }
.board-admin { display: flex; flex-wrap: wrap; gap: 6px 20px; align-items: baseline; margin: 0 0 22px; max-width: var(--measure); }
.board-admin p { margin: 0; }

.stats .bar-cell { width: 40%; min-width: 120px; white-space: nowrap; }
.bar { display: inline-block; height: 10px; vertical-align: middle; width: 0; }
.bar.full { background: var(--signal); }
.bar.partial { background: var(--signal-soft); opacity: 0.55; }

.about { max-width: var(--measure); }
.about h1 { font: 400 54px/0.95 var(--font-display); color: var(--signal); margin: 8px 0 26px; }