:root {
  --bg: #eef1f5;
  --surface: #ffffff;
  --surface-2: #e6eaf0;
  --ink: #101b27;
  --muted: #3e4b5c;
  --line: #d3dae3;
  --accent: #2c3cb8;
  --accent-ink: #ffffff;
  --senior-a: #0b5f58;
  --senior-b: #7a2f8c;
  --miss: #a33a28;
  --half: #8a5a0c;
  --hit: #146b42;
  --code-bg: #f0f3f8;
  --shadow: 0 1px 0 rgba(16, 27, 39, 0.04), 0 12px 32px -18px rgba(16, 27, 39, 0.28);
  --display: "Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  --body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1016;
    --surface: #141b24;
    --surface-2: #1c2531;
    --ink: #e8edf3;
    --muted: #b4c0ce;
    --line: #314052;
    --accent: #a8b4ff;
    --accent-ink: #0b1016;
    --senior-a: #5ee0d2;
    --senior-b: #e2b0f4;
    --miss: #ffb0a0;
    --half: #f0c56e;
    --hit: #6ee0a8;
    --code-bg: #0f151d;
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 16px 36px -20px rgba(0, 0, 0, 0.8);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b1016;
  --surface: #141b24;
  --surface-2: #1c2531;
  --ink: #e8edf3;
  --muted: #b4c0ce;
  --line: #314052;
  --accent: #a8b4ff;
  --accent-ink: #0b1016;
  --senior-a: #5ee0d2;
  --senior-b: #e2b0f4;
  --miss: #ffb0a0;
  --half: #f0c56e;
  --hit: #6ee0a8;
  --code-bg: #0f151d;
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 16px 36px -20px rgba(0, 0, 0, 0.8);
  color-scheme: dark;
}

:root[data-theme="light"] { color-scheme: light; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { min-height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--body);
  -webkit-tap-highlight-color: transparent;
}
body.has-dock { padding-bottom: calc(176px + env(safe-area-inset-bottom, 0px)); }
img { max-width: 100%; }
[hidden] { display: none !important; }

.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 50;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}
.skip:focus { top: calc(8px + env(safe-area-inset-top, 0px)); }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

a { color: var(--accent); }
.topbar a, .toc a, .tile, .text-link { text-decoration: none; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top, 0px);
}
.topbar-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 10px max(16px, env(safe-area-inset-right, 0px)) 10px max(16px, env(safe-area-inset-left, 0px));
  display: flex;
  align-items: center;
  gap: 12px;
}
.wordmark {
  font: 800 18px/1 var(--display);
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-right: auto;
}
.wordmark span { color: var(--accent); }
.nav {
  display: flex;
  gap: 4px;
  overflow-x: auto;
}
.nav a {
  color: var(--muted);
  font: 600 14px var(--body);
  padding: 8px 10px;
  border-radius: 999px;
  white-space: nowrap;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--surface);
  box-shadow: 0 1px 0 var(--line);
}
.theme-btn {
  flex: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font: 600 13px var(--body);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
  min-height: 44px;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px max(16px, env(safe-area-inset-right, 0px)) 32px max(16px, env(safe-area-inset-left, 0px));
  display: grid;
  gap: 18px;
}
.wrap > *, .card > *, .prose > *, .layout-doc > *, .list > * { min-width: 0; }
.wrap.wide { max-width: 880px; }
.wrap.docs { max-width: 1040px; }

.hero { display: grid; gap: 12px; padding-top: 8px; }
.kicker {
  margin: 0;
  color: var(--accent);
  font: 600 14px var(--body);
}
.hero h1, .page-title {
  font: 800 clamp(36px, 7vw, 60px)/0.96 var(--display);
  letter-spacing: -0.04em;
  margin: 0;
  text-wrap: balance;
}
.lede {
  margin: 0;
  max-width: 38rem;
  font-size: 18px;
  color: var(--ink);
}
.actions { display: flex; flex-wrap: wrap; gap: 8px; }
.install { margin: 0; }

.btn {
  font: 600 15px var(--body);
  border-radius: 12px;
  padding: 12px 16px;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  touch-action: manipulation;
}
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.ghost { background: transparent; }
.btn.link { border: 0; background: none; padding: 0; color: var(--accent); font-size: 14px; min-height: 0; justify-self: start; }
.btn.danger { color: var(--miss); border-color: color-mix(in srgb, var(--miss) 55%, var(--line)); background: transparent; }
.btn[aria-pressed="true"] { box-shadow: inset 0 0 0 2px var(--accent); }

.status {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 14px;
  align-items: center;
  background: var(--surface);
  border-radius: 18px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.status p { margin: 0; }
.status .links { display: flex; flex-wrap: wrap; gap: 10px 14px; }
.ring { position: relative; width: 52px; height: 52px; }
.ring svg { display: block; transform: rotate(-90deg); }
.ring .track { stroke: var(--line); }
.ring .value { stroke: var(--hit); }
.ring span {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font: 600 13px var(--body);
  font-variant-numeric: tabular-nums;
}

.section-head { display: grid; gap: 4px; }
.section-head h2, .prose h2, .page-head h1 {
  font-family: var(--display);
  letter-spacing: -0.03em;
}
.section-head h2 { font-size: 28px; margin: 8px 0 0; }
.section-head p, .hint { margin: 0; color: var(--muted); }

.days { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.day {
  background: var(--surface);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 16px 16px 14px;
  display: grid;
  gap: 8px;
}
.day.is-next { box-shadow: var(--shadow), inset 0 0 0 2px var(--accent); }
.day-top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.day-num {
  font: 800 13px var(--mono);
  color: var(--accent);
  letter-spacing: 0.04em;
}
.next-flag {
  font: 600 12px var(--body);
  color: var(--accent);
}
.day h3 {
  font: 700 22px/1.2 var(--display);
  letter-spacing: -0.02em;
  margin: 0;
}
.day p { margin: 0; }
.day-links { display: flex; flex-wrap: wrap; gap: 8px 14px; }
.done-when {
  background: var(--surface-2);
  border-radius: 12px;
  padding: 10px 12px;
  display: grid;
  gap: 2px;
}
.day-check {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  min-height: 44px;
}
.day-check input { width: 22px; height: 22px; accent-color: var(--accent); }
.day-evidence { margin: 0; color: var(--muted); font-size: 13px; }

.paths { display: grid; gap: 10px; }
@media (min-width: 800px) {
  .paths { grid-template-columns: repeat(3, 1fr); }
}
.tile {
  display: grid;
  gap: 6px;
  align-content: start;
  background: var(--surface);
  color: var(--ink);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
  min-height: 100%;
}
.tile:hover, .tile:focus-visible { box-shadow: var(--shadow), inset 0 0 0 2px var(--accent); }
.tile strong { font: 700 18px/1.25 var(--display); letter-spacing: -0.02em; }
.tile span { color: var(--muted); font-size: 14px; }

.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.page-head h1 {
  font: 800 clamp(32px, 6vw, 44px)/0.98 var(--display);
  margin: 0;
  letter-spacing: -0.035em;
}
.page-head p { margin: 4px 0 0; color: var(--muted); }

.controls { display: grid; gap: 10px; }
.tabs {
  display: flex;
  gap: 4px;
  background: var(--surface-2);
  border-radius: 12px;
  padding: 4px;
  overflow-x: auto;
}
.tabs button {
  flex: 1 0 auto;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 600 14px var(--body);
  padding: 9px 8px;
  border-radius: 9px;
  cursor: pointer;
  min-height: 44px;
}
.tabs button[aria-pressed="true"] {
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}
select, .search, textarea {
  width: 100%;
  font: 500 16px var(--body);
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}
textarea { min-height: 128px; resize: vertical; line-height: 1.5; font-weight: 400; }
.boxes { display: flex; height: 6px; border-radius: 999px; overflow: hidden; background: var(--line); }
.boxes span { display: block; height: 100%; }
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  font: 500 12px var(--body);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.legend i {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  margin-right: 5px;
}

.card {
  position: relative;
  background: var(--surface);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 22px 18px 18px;
  display: grid;
  gap: 14px;
  min-width: 0;
  overflow: hidden;
}
.timer { position: absolute; inset: 0 0 auto; height: 4px; background: var(--surface-2); }
.timer span { display: block; height: 100%; width: 100%; background: var(--accent); transform-origin: left; }
.timer.over span { background: var(--half); }
.speaker { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: 600 12px var(--body);
  letter-spacing: 0.02em;
  padding: 4px 10px 4px 4px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--ink);
}
.chip .avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font: 700 11px var(--display);
  color: var(--bg);
}
.chip.a .avatar { background: var(--senior-a); }
.chip.b .avatar { background: var(--senior-b); }
.topic { font: 500 12px var(--body); color: var(--muted); }
.star { font: 600 12px var(--body); color: var(--half); }
.q {
  font: 700 clamp(22px, 5.4vw, 30px)/1.22 var(--display);
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}
.timer-live {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.timer-live.is-visible {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
  font: 600 14px var(--body);
  color: var(--half);
}
pre, .snippet {
  margin: 0;
  max-width: 100%;
  min-width: 0;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  overflow-x: auto;
  font: 400 13px/1.55 var(--mono);
  color: var(--ink);
  tab-size: 4;
}
.q:focus, #answer:focus { outline: none; }
pre code, .snippet code { font: inherit; background: none; padding: 0; }
pre[data-lang]::before {
  content: attr(data-lang);
  display: block;
  margin-bottom: 8px;
  font: 600 11px/1 var(--body);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.answer { display: grid; gap: 12px; min-width: 0; }
.answer p, .prose p { margin: 0; }
.label {
  font: 600 11px var(--body);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}
.fu, .alarm, .model {
  display: grid;
  gap: 8px;
  padding: 12px 14px;
  border-radius: 12px;
}
.fu { background: var(--surface-2); }
.alarm {
  background: color-mix(in srgb, var(--miss) 12%, var(--surface));
  box-shadow: inset 3px 0 0 var(--miss);
}
.model { background: var(--surface-2); }
.who { font: 600 12px var(--body); color: var(--muted); }
.fq { font-weight: 600; margin: 0; }
code {
  font: 500 0.9em var(--mono);
  background: var(--surface-2);
  padding: 1px 5px;
  border-radius: 5px;
  overflow-wrap: anywhere;
}
.fu code, .alarm code, .model code, .prose code { background: color-mix(in srgb, var(--ink) 8%, var(--surface)); }

.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 25;
  padding: 12px max(16px, env(safe-area-inset-right, 0px)) calc(12px + env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px));
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
}
.dock-inner { max-width: 720px; margin: 0 auto; display: grid; gap: 8px; }
.dock .btn.primary { width: 100%; padding: 14px; font-size: 16px; }
.grades { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.grades .btn { padding: 10px 4px; font-size: 14px; display: grid; gap: 1px; justify-items: center; min-height: 52px; }
.grades .btn small { font: 500 11px var(--body); opacity: 0.85; }
.grades .miss { color: var(--miss); border-color: color-mix(in srgb, var(--miss) 65%, var(--line)); }
.grades .half { color: var(--half); border-color: color-mix(in srgb, var(--half) 65%, var(--line)); }
.grades .hit { color: var(--hit); border-color: color-mix(in srgb, var(--hit) 65%, var(--line)); }

.summary { text-align: center; justify-items: center; }
.summary .big {
  font: 800 56px/1 var(--display);
  letter-spacing: -0.03em;
  margin: 0;
  font-variant-numeric: tabular-nums;
}
.tally { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; width: 100%; }
.tally div { background: var(--surface-2); border-radius: 12px; padding: 10px 6px; display: grid; gap: 2px; }
.tally b { font: 700 22px var(--display); font-variant-numeric: tabular-nums; }
.tally span { font-size: 12px; color: var(--muted); }
.summary-links { display: flex; flex-wrap: wrap; gap: 8px 14px; justify-content: center; }
.summary-links a { font-weight: 600; }
.weak-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; width: 100%; text-align: left; }
.weak-list li {
  background: var(--surface-2);
  border-radius: 12px;
  padding: 10px 12px;
  display: grid;
  gap: 2px;
}
.weak-list b { font-variant-numeric: tabular-nums; }

.rounds { display: grid; gap: 10px; }
.round-card {
  text-align: left;
  width: 100%;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 14px 12px;
  display: grid;
  gap: 4px;
  cursor: pointer;
  font: inherit;
}
.round-card.primary-round { border-color: var(--accent); box-shadow: var(--shadow); }
.round-card small { color: var(--muted); }
.round-card strong { font: 700 18px/1.25 var(--display); }

.list { display: grid; gap: 8px; }
details.bank {
  background: var(--surface);
  border-radius: 14px;
  padding: 12px 14px;
  min-width: 0;
  box-shadow: 0 1px 0 var(--line);
}
details.bank summary {
  cursor: pointer;
  font-weight: 600;
  display: flex;
  gap: 10px;
  align-items: baseline;
  list-style: none;
}
details.bank summary::-webkit-details-marker { display: none; }
details.bank summary .num {
  font: 500 12px var(--mono);
  color: var(--muted);
  flex: none;
  min-width: 42px;
  font-variant-numeric: tabular-nums;
}
.dot { flex: none; width: 8px; height: 8px; border-radius: 50%; align-self: center; }
details.bank[open] summary { margin-bottom: 12px; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat {
  background: var(--surface);
  border-radius: 14px;
  padding: 14px 12px;
  display: grid;
  gap: 2px;
  box-shadow: 0 1px 0 var(--line);
}
.stat b { font: 800 28px/1 var(--display); font-variant-numeric: tabular-nums; }
.stat span { font-size: 12px; color: var(--muted); }
.sections, .settings, .rubric {
  display: grid;
  gap: 12px;
  background: var(--surface);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 1px 0 var(--line);
}
.sec { display: grid; gap: 6px; }
.sec-head { display: flex; justify-content: space-between; gap: 10px; font-size: 14px; }
.sec-head span:last-child { color: var(--muted); font-variant-numeric: tabular-nums; flex: none; }
.toggle { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 15px; min-height: 44px; }
.toggle input { width: 22px; height: 22px; accent-color: var(--accent); }
.confirm { display: grid; gap: 8px; }
.confirm .row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.empty { color: var(--muted); text-align: center; padding: 28px 8px; margin: 0; }
kbd {
  font: 500 12px var(--mono);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0 5px;
  background: var(--surface-2);
}

.pager { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 2px; }
.pager button {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font: 600 13px var(--body);
  cursor: pointer;
}
.pager button[aria-current="true"] {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.attempt { display: grid; gap: 6px; }
.attempt label { font-weight: 600; }

.layout-doc {
  display: grid;
  gap: 18px;
  align-items: start;
}
.toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.toc a {
  flex: none;
  color: var(--muted);
  background: var(--surface);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 1px 0 var(--line);
}
.toc a.sub { font-weight: 500; }
@media (min-width: 960px) {
  .layout-doc { grid-template-columns: 220px minmax(0, 1fr); }
  .toc {
    position: sticky;
    top: calc(64px + env(safe-area-inset-top, 0px));
    flex-direction: column;
    max-height: calc(100vh - 96px);
    overflow: auto;
    gap: 2px;
    order: -1;
  }
  .toc a {
    background: transparent;
    box-shadow: none;
    border-radius: 8px;
    padding: 5px 8px;
    white-space: normal;
  }
  .toc a.sub { padding-left: 16px; }
}

.prose { display: grid; gap: 12px; min-width: 0; max-width: 68ch; }
.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: var(--display);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 18px 0 0;
  scroll-margin-top: calc(72px + env(safe-area-inset-top, 0px));
}
.prose h2 { font-size: 28px; }
.prose h3 { font-size: 22px; }
.prose h4 { font-size: 18px; }
.prose ul, .prose ol { margin: 0; padding-left: 1.2em; display: grid; gap: 6px; }
.prose li p { margin: 0.2em 0; }
.prose blockquote {
  margin: 0;
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--accent);
  display: grid;
  gap: 8px;
}
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 8px 0; width: 100%; }
.table-wrap { overflow-x: auto; max-width: 100%; min-width: 0; border: 1px solid var(--line); border-radius: 12px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 14px; }
.prose th, .prose td {
  text-align: left;
  vertical-align: top;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  min-width: 8rem;
}
.prose th { font-size: 13px; background: var(--surface-2); }
.prose tr:last-child td { border-bottom: 0; }
.doc-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 8px;
}
.doc-nav a { font-weight: 600; }
.crumb { margin: 0; color: var(--muted); font-size: 14px; }
.crumb a { font-weight: 600; }

.catalog { display: grid; gap: 10px; }
@media (min-width: 800px) {
  .catalog { grid-template-columns: 1fr 1fr; }
}

.site-footer {
  max-width: 1040px;
  margin: 0 auto;
  padding: 8px max(16px, env(safe-area-inset-right, 0px)) 28px max(16px, env(safe-area-inset-left, 0px));
  color: var(--muted);
  font-size: 13px;
  display: grid;
  gap: 4px;
}
.site-footer p { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ring .value { transition: none; }
}
@media (prefers-reduced-motion: no-preference) {
  .card { animation: deal 0.22s ease-out; }
  .answer { animation: open 0.2s ease-out; }
  .ring .value { transition: stroke-dashoffset 0.4s ease; }
  .boxes span { transition: width 0.3s ease; }
  @keyframes deal { from { transform: translateY(6px); } to { transform: none; } }
  @keyframes open { from { opacity: 0.4; } to { opacity: 1; } }
}

@media (max-width: 720px) {
  .topbar-inner { flex-wrap: wrap; row-gap: 4px; }
  .wordmark { margin-right: auto; font-size: 16px; }
  .nav { order: 3; flex: 1 0 100%; min-width: 0; }
  .nav a { padding: 8px; }
  .status { grid-template-columns: auto 1fr; }
}