@font-face {
  font-family: "DM Sans";
  src: url("/fonts/dm-sans-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 1000;
  font-display: swap;
}
/* Semantic surfaces: opaque fallbacks first; glass is progressive enhancement. */
:root {
  color-scheme: light dark;
  --bg: light-dark(#eef2f6, #11161e);
  --ink: light-dark(#202c3b, #edf2fa);
  --muted: light-dark(#526278, #abb9cc);
  --faint: light-dark(#67768a, #96a7bc);
  --solid: light-dark(#f8fafc, #1b2430);
  --surface: light-dark(#f8fafc, #1b2430);
  --raised: light-dark(#fff, #243040);
  --inset: light-dark(#e8eef4, #151e29);
  --line: light-dark(#d5dee8, #3a485a);
  --edge: light-dark(#fff, #55647a);
  --accent: light-dark(#785c26, #e2c482);
  --accent-soft: light-dark(#eee5d2, #3a3327);
  --action: light-dark(#26394e, #dce6f3);
  --action-ink: light-dark(#fff, #172333);
  --positive: light-dark(#356647, #a8d4b7);
  --positive-bg: light-dark(#e6f1e9, #203c30);
  --negative: light-dark(#993d38, #f3aea7);
  --negative-bg: light-dark(#f7e8e5, #432a2c);
  --glow: light-dark(#cfdae94d, #30496738);
  --gold-glow: light-dark(#dec99b38, #b69a5721);
  --shadow: light-dark(0 12px 40px #3e53670b, 0 14px 44px #00000024);
  --sidebar-width: 252px;
  --radius: 28px;
  --glass-blur: none;
  font-family:
    "DM Sans",
    -apple-system,
    BlinkMacSystemFont,
    "PingFang TC",
    "Noto Sans TC",
    "Microsoft JhengHei",
    sans-serif;
  font-synthesis: none;
  color: var(--ink);
  background: var(--bg);
}
html[data-theme="light"] {
  color-scheme: light;
}
html[data-theme="dark"] {
  color-scheme: dark;
}
/* Older browsers without light-dark retain a complete readable light palette. */
@supports not (color: light-dark(white, black)) {
  :root {
    color-scheme: light;
    --bg: #eef2f6;
    --ink: #202c3b;
    --muted: #526278;
    --faint: #67768a;
    --solid: #f8fafc;
    --surface: #f8fafc;
    --raised: #fff;
    --inset: #e8eef4;
    --line: #d5dee8;
    --edge: #fff;
    --accent: #785c26;
    --accent-soft: #eee5d2;
    --action: #26394e;
    --action-ink: #fff;
    --positive: #356647;
    --positive-bg: #e6f1e9;
    --negative: #993d38;
    --negative-bg: #f7e8e5;
    --glow: #cfdae94d;
    --gold-glow: #dec99b38;
    --shadow: 0 12px 40px #3e53670b;
  }
  html[data-theme="dark"] {
    color-scheme: dark;
    --bg: #11161e;
    --ink: #edf2fa;
    --muted: #abb9cc;
    --faint: #96a7bc;
    --solid: #1b2430;
    --surface: #1b2430;
    --raised: #243040;
    --inset: #151e29;
    --line: #3a485a;
    --edge: #55647a;
    --accent: #e2c482;
    --accent-soft: #3a3327;
    --action: #dce6f3;
    --action-ink: #172333;
    --positive: #a8d4b7;
    --positive-bg: #203c30;
    --negative: #f3aea7;
    --negative-bg: #432a2c;
    --glow: #30496738;
    --gold-glow: #b69a5721;
    --shadow: 0 14px 44px #00000024;
  }
  @media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) {
      color-scheme: dark;
      --bg: #11161e;
      --ink: #edf2fa;
      --muted: #abb9cc;
      --faint: #96a7bc;
      --solid: #1b2430;
      --surface: #1b2430;
      --raised: #243040;
      --inset: #151e29;
      --line: #3a485a;
      --edge: #55647a;
      --accent: #e2c482;
      --accent-soft: #3a3327;
      --action: #dce6f3;
      --action-ink: #172333;
      --positive: #a8d4b7;
      --positive-bg: #203c30;
      --negative: #f3aea7;
      --negative-bg: #432a2c;
      --glow: #30496738;
      --gold-glow: #b69a5721;
      --shadow: 0 14px 44px #00000024;
    }
  }
}
@supports (color: light-dark(white, black)) and
  ((backdrop-filter: blur(16px)) or (-webkit-backdrop-filter: blur(16px))) {
  :root {
    --surface: light-dark(#ffffffc7, #202b39d4);
    --glass-blur: blur(20px) saturate(115%);
  }
}
* {
  box-sizing: border-box;
}
html {
  min-width: 280px;
  scroll-padding-top: 24px;
}
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse at 85% 0%, var(--gold-glow), transparent 48%),
    radial-gradient(ellipse at 25% 30%, var(--glow), transparent 60%), var(--bg);
  background-attachment: fixed;
}
button,
input,
select,
textarea {
  font: inherit;
}
button,
a,
input,
select,
textarea {
  -webkit-tap-highlight-color: transparent;
}
button,
a {
  touch-action: manipulation;
}
button {
  cursor: pointer;
}
a {
  color: inherit;
  text-decoration: none;
}
button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
button,
input,
select,
textarea {
  min-height: 44px;
}
button {
  min-width: 44px;
}
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}
::selection {
  background: var(--accent-soft);
  color: var(--ink);
}
.skip {
  position: fixed;
  top: -90px;
  left: 16px;
  z-index: 30;
  background: var(--raised);
  padding: 16px 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
}
.skip:focus {
  top: 12px;
}
.sidebar {
  position: fixed;
  inset: 18px auto 18px 18px;
  width: var(--sidebar-width);
  border: 1px solid var(--edge);
  border-radius: 32px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  padding: 28px 17px;
  z-index: 5;
  overflow-y: auto;
}
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  color: var(--ink);
  font-weight: 650;
  letter-spacing: 1px;
  font-size: 20px;
  min-height: 48px;
}
.brand small {
  display: block;
  font-size: 9px;
  letter-spacing: 1.4px;
  color: var(--muted);
  margin-top: 7px;
}
.brand-mark {
  border: 1px solid var(--line);
  border-radius: 17px;
  width: 45px;
  height: 49px;
  flex-shrink: 0;
  font-size: 28px;
  color: var(--accent);
  background: linear-gradient(140deg, var(--raised), var(--accent-soft));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.brand-mark span {
  font-size: 13px;
  position: absolute;
  right: 4px;
  top: 4px;
}
.side-label {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--faint);
  margin: 35px 14px 15px;
}
nav {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
nav a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid transparent;
  border-radius: 18px;
  font-size: 14px;
  gap: 12px;
  transition:
    background 0.18s,
    border-color 0.18s;
  color: var(--muted);
}
nav a > span:first-child {
  font-size: 20px;
  width: 24px;
  color: var(--faint);
}
nav a:hover {
  background: var(--inset);
  color: var(--ink);
}
nav a.active {
  background: var(--raised);
  border-color: var(--line);
  color: var(--ink);
  font-weight: 650;
  box-shadow: 0 4px 16px #20334d06;
}
nav a.active > span:first-child {
  color: var(--accent);
}
.nav-badge {
  margin-left: auto;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 8px;
  padding: 3px 7px;
  font-size: 11px;
}
.side-bottom {
  margin-top: auto;
  font-size: 12px;
}
.exam-date {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 16px 13px;
  margin-top: 30px;
  margin-bottom: 15px;
  color: var(--ink);
  background: var(--inset);
}
.exam-date small {
  display: block;
  margin: 8px 0 0 14px;
  font-size: 11px;
  color: var(--muted);
}
.status-dot,
.live-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
}
.side-bottom > a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--muted);
}
#sync-status {
  margin: 12px 12px 0;
  font-size: 11px;
  color: var(--muted);
  line-height: 1.8;
  overflow-wrap: anywhere;
}
.workspace {
  margin-left: calc(var(--sidebar-width) + 36px);
  min-width: 0;
}
.topbar {
  min-height: 90px;
  border-bottom: 1px solid var(--line);
  padding: 16px 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 12px;
  color: var(--muted);
}
.topbar > div {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
  flex-wrap: wrap;
}
.live-dot {
  background: var(--positive);
}
.avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  margin-left: 6px;
  flex-shrink: 0;
}
#theme-select {
  font-size: 12px;
  min-width: 100px;
  max-width: 160px;
  min-height: 44px;
  padding: 9px 12px;
  border-radius: 16px;
  background: var(--surface);
}
main {
  max-width: 1280px;
  margin: auto;
  padding: 40px 42px 64px;
  min-height: calc(100vh - 170px);
  outline: none;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1 {
  font-size: clamp(26px, 2.6vw, 36px);
  line-height: 1.5;
  letter-spacing: -0.9px;
  font-weight: 650;
  margin-bottom: 10px;
  text-wrap: balance;
}
h2 {
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -0.35px;
  line-height: 1.6;
}
h3 {
  font-size: 16px;
  line-height: 1.7;
}
p {
  line-height: 1.9;
}
.eyebrow {
  font-size: 10px;
  letter-spacing: 2.2px;
  color: var(--faint);
  font-weight: 650;
  margin-bottom: 12px;
}
.muted {
  color: var(--muted);
}
.small {
  font-size: 13px;
}
.page-head {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 20px;
  margin-bottom: 30px;
}
.page-head p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 0;
}
.date-tag {
  font-size: 11px;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 10px 14px;
  border-radius: 16px;
  white-space: nowrap;
  margin-top: 4px;
}
.hero,
.panel,
.stat,
.domain-card,
.filters,
.question-card,
.topic {
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow:
    inset 0 1px 0 var(--edge),
    var(--shadow);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 205px;
  padding: 34px 36px;
  border-radius: 32px;
  overflow: hidden;
  position: relative;
  gap: 24px;
  background:
    radial-gradient(ellipse at 85% 30%, var(--gold-glow), transparent 60%),
    var(--surface);
}
.hero h2 {
  font-size: 29px;
  line-height: 1.65;
  margin: 10px 0 14px;
  font-weight: 550;
  letter-spacing: -0.7px;
}
.hero p {
  font-size: 14px;
  color: var(--muted);
  max-width: 550px;
  margin-bottom: 24px;
}
.hero-right {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.orbit {
  width: 166px;
  height: 166px;
  border: 1px solid var(--line);
  border-radius: 50%;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  box-shadow:
    inset 0 2px 0 var(--edge),
    0 12px 30px #29435d08;
  outline: 1px solid var(--line);
  outline-offset: 16px;
}
.orbit:before,
.orbit:after {
  content: "";
  position: absolute;
  background: var(--accent);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  top: 10px;
  left: 24px;
}
.orbit:after {
  top: auto;
  left: auto;
  bottom: 4px;
  right: 32px;
  opacity: 0.5;
}
.orbit strong {
  font-size: 66px;
  font-weight: 400;
  letter-spacing: -4px;
  line-height: 1.2;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.orbit span {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 3px;
}
.orbit small {
  font-size: 9px;
  margin-top: 7px;
  color: var(--faint);
}
.button {
  border: 1px solid transparent;
  border-radius: 18px;
  background: var(--action);
  color: var(--action-ink);
  min-height: 44px;
  min-width: 44px;
  padding: 10px 18px;
  display: inline-flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.65;
  transition:
    transform 0.16s,
    box-shadow 0.16s,
    background 0.16s;
  text-align: center;
}
.button:hover {
  box-shadow: 0 5px 16px #1b2d411a;
  transform: translateY(-1px);
}
.button.secondary {
  background: var(--raised);
  border-color: var(--line);
  color: var(--ink);
}
.button.ghost {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
}
.button.danger {
  background: var(--negative);
  color: var(--bg);
}
.button.small {
  font-size: 12px;
  padding: 9px 14px;
  min-height: 44px;
}
.actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 15px;
  margin: 24px 0 38px;
}
.stat {
  border-radius: 24px;
  padding: 22px;
}
.stat > span {
  font-size: 12px;
  color: var(--muted);
  display: block;
  margin-bottom: 14px;
}
.stat strong {
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -1.5px;
  font-variant-numeric: tabular-nums;
}
.stat small {
  font-size: 11px;
  color: var(--muted);
  margin-left: 7px;
}
.stat .tiny {
  display: block;
  margin-top: 11px;
  margin-bottom: 0;
  font-size: 11px;
  color: var(--faint);
  line-height: 1.7;
}
.section-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin: 10px 0 20px;
}
.section-title h2 {
  margin: 0;
}
.section-title > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 12px;
  color: var(--muted);
}
.domain-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 17px;
}
.domain-card {
  padding: 25px;
  border-radius: 26px;
  transition:
    transform 0.18s,
    border-color 0.18s;
  min-width: 0;
}
.domain-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}
.domain-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.domain-icon {
  background: var(--inset);
  color: var(--muted);
  font:
    600 15px ui-monospace,
    monospace;
  width: 42px;
  height: 42px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 15px;
  border: 1px solid var(--line);
}
.domain-top > span:last-child {
  font-size: 11px;
  color: var(--faint);
}
.domain-card h3 {
  margin: 19px 0 7px;
}
.domain-card p {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 24px;
  min-height: 23px;
}
.bar {
  height: 4px;
  background: var(--inset);
  border-radius: 8px;
  overflow: hidden;
}
.bar > span {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: 8px;
}
.domain-foot {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 11px;
  color: var(--muted);
  margin-top: 11px;
}
.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 22px;
  margin-top: 28px;
}
.panel {
  padding: 28px;
  border-radius: 28px;
  min-width: 0;
}
.panel h2 {
  margin-bottom: 18px;
}
.plan-row {
  display: flex;
  gap: 15px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.8;
}
.plan-row:last-child {
  border: 0;
}
.plan-row .step {
  width: 27px;
  height: 27px;
  background: var(--inset);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--muted);
  flex-shrink: 0;
}
.plan-row p {
  font-size: 12px;
  color: var(--muted);
  margin: 5px 0 0;
}
.note-box {
  padding: 18px 21px;
  border-radius: 20px;
  background: var(--accent-soft);
  font-size: 13px;
  line-height: 1.95;
  color: var(--accent);
  border: 1px solid var(--line);
  overflow-wrap: anywhere;
}
.note-box a,
.prose a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.note-box .button {
  margin-top: 10px;
}
.filters {
  display: flex;
  align-items: end;
  gap: 15px;
  flex-wrap: wrap;
  padding: 23px;
  border-radius: 24px;
  margin-bottom: 25px;
}
label {
  font-size: 13px;
  display: block;
  color: var(--muted);
}
label > span {
  display: block;
  margin-bottom: 9px;
}
input,
select,
textarea {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 11px 13px;
  background: var(--raised);
  color: var(--ink);
  max-width: 100%;
  line-height: 1.5;
}
select {
  min-width: 138px;
}
textarea {
  display: block;
  width: 100%;
  min-height: 110px;
  resize: vertical;
  font-size: 14px;
  line-height: 1.85;
}
input::placeholder,
textarea::placeholder {
  color: var(--faint);
  opacity: 1;
}
.filters input {
  width: 230px;
}
.empty {
  text-align: center;
  padding: 48px 22px;
  color: var(--muted);
  line-height: 1.9;
  overflow-wrap: anywhere;
}
.empty strong {
  display: block;
  color: var(--ink);
  font-size: 19px;
  margin-bottom: 13px;
}
.empty .button {
  margin-top: 14px;
}
.pill {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  border-radius: 10px;
  background: var(--inset);
  padding: 5px 9px;
  color: var(--muted);
  white-space: nowrap;
  border: 1px solid var(--line);
}
.pill.gold {
  background: var(--accent-soft);
  color: var(--accent);
}
.pill.red {
  background: var(--negative-bg);
  color: var(--negative);
}
.question-wrap {
  max-width: 920px;
  margin: auto;
}
.question-head {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  align-items: center;
  margin-bottom: 21px;
}
.question-head > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.question-card {
  padding: 34px;
  border-radius: 30px;
}
.question-card h2 {
  font-size: 21px;
  line-height: 1.95;
  white-space: pre-line;
  margin: 22px 0;
  font-weight: 550;
  overflow-wrap: anywhere;
}
.question-card pre,
.topic-body pre {
  background: var(--inset);
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 22px;
  border-radius: 20px;
  overflow: auto;
  font:
    13px/1.85 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  white-space: pre;
  max-width: 100%;
}
.options {
  display: grid;
  gap: 12px;
  margin: 24px 0;
}
.option {
  display: flex;
  align-items: start;
  gap: 14px;
  text-align: left;
  width: 100%;
  min-height: 58px;
  border: 1px solid var(--line);
  background: var(--raised);
  padding: 17px 19px;
  border-radius: 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  transition:
    background 0.15s,
    border-color 0.15s;
  overflow-wrap: anywhere;
}
.option > span:first-child {
  border: 1px solid var(--line);
  background: var(--surface);
  width: 29px;
  height: 29px;
  min-width: 29px;
  border-radius: 10px;
  text-align: center;
  line-height: 27px;
  font-size: 12px;
  color: var(--muted);
}
.option > span:last-child {
  min-width: 0;
}
.option:hover:not(:disabled) {
  border-color: var(--accent);
}
.option.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.option.correct {
  border-color: var(--positive);
  background: var(--positive-bg);
}
.option.wrong {
  border-color: var(--negative);
  background: var(--negative-bg);
}
.option:disabled {
  opacity: 1;
  cursor: default;
}
.question-tools {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 22px;
  align-items: center;
}
.feedback {
  border-top: 1px solid var(--line);
  padding-top: 27px;
  margin-top: 27px;
}
.feedback h3 {
  font-size: 18px;
}
.reason {
  background: var(--inset);
  border: 1px solid var(--line);
  padding: 20px 24px;
  border-radius: 22px;
  font-size: 14px;
  line-height: 1.95;
  margin-bottom: 21px;
  overflow-wrap: anywhere;
}
.reason ol {
  padding-left: 22px;
  margin: 9px 0;
}
.reason li + li {
  margin-top: 5px;
}
.explanation {
  font-size: 14px;
  line-height: 1.95;
  margin: 16px 0;
  display: flex;
  gap: 14px;
}
.explanation b {
  color: var(--positive);
  white-space: nowrap;
}
.explanation b.no {
  color: var(--negative);
}
.explanation span {
  min-width: 0;
  overflow-wrap: anywhere;
}
.source-links {
  display: flex;
  gap: 8px 14px;
  flex-wrap: wrap;
  font-size: 12px;
  margin-top: 19px;
}
.source-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: underline;
  text-underline-offset: 4px;
  color: var(--muted);
  overflow-wrap: anywhere;
}
.topic-list {
  display: grid;
  gap: 14px;
}
.topic {
  border-radius: 24px;
  overflow: hidden;
}
.topic summary {
  min-height: 74px;
  padding: 21px 25px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  list-style: none;
}
.topic summary::-webkit-details-marker {
  display: none;
}
.topic summary > div {
  min-width: 0;
}
.topic summary strong {
  font-size: 15px;
  line-height: 1.8;
  overflow-wrap: anywhere;
}
.topic summary small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-top: 5px;
}
.topic[open] > summary {
  border-bottom: 1px solid var(--line);
  margin-bottom: 22px;
}
.topic-body {
  padding: 0 25px 25px;
  font-size: 14px;
  line-height: 1.95;
  overflow-wrap: anywhere;
}
.topic-body > p {
  margin-bottom: 17px;
}
.check-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 19px 0;
}
.check-controls button {
  min-height: 44px;
  padding: 10px 13px;
  font-size: 12px;
  border: 1px solid var(--line);
  background: var(--raised);
  border-radius: 16px;
  color: var(--muted);
}
.check-controls button.chosen {
  background: var(--action);
  color: var(--action-ink);
  border-color: var(--action);
}
.list-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 19px 0;
  border-bottom: 1px solid var(--line);
}
.list-row:last-child {
  border-bottom: 0;
}
.list-row > div {
  min-width: 0;
}
.list-row > .button {
  flex-shrink: 0;
}
.list-row strong {
  display: block;
  font-size: 14px;
  line-height: 1.85;
  overflow-wrap: anywhere;
}
.list-row small {
  font-size: 11px;
  color: var(--muted);
}
.timer {
  font:
    600 21px ui-monospace,
    monospace;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: 17px;
  padding: 11px 15px;
  min-width: 99px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.timer.urgent {
  color: var(--negative);
  background: var(--negative-bg);
}
.question-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 24px 0;
}
.question-nav button {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  border-radius: 15px;
  font-size: 12px;
}
.question-nav button.answered {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--line);
}
.question-nav button.current {
  background: var(--action);
  color: var(--action-ink);
  border-color: var(--action);
}
.result-score {
  text-align: center;
  padding: 27px;
}
.result-score strong {
  font-size: 68px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -4px;
  font-variant-numeric: tabular-nums;
}
.result-score span {
  color: var(--muted);
  font-size: 18px;
}
.result-score p {
  margin: 11px 0;
}
.form-grid {
  display: grid;
  gap: 20px;
  max-width: 640px;
}
.form-grid input {
  width: 100%;
}
.form-grid .help {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.85;
  margin: 8px 0 0;
}
.prose {
  font-size: 14px;
  line-height: 2;
}
.prose p {
  margin-bottom: 22px;
}
.source-row {
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
}
.source-row a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.source-row small {
  display: block;
  overflow-wrap: anywhere;
  font-size: 11px;
  color: var(--muted);
}
.leaderboard {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.leaderboard th {
  text-align: left;
  font-weight: 500;
  color: var(--muted);
  font-size: 12px;
  padding: 15px 12px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.leaderboard td {
  padding: 18px 12px;
  border-bottom: 1px solid var(--line);
  overflow-wrap: anywhere;
}
.leaderboard tr.me {
  background: var(--inset);
}
.rank {
  color: var(--accent);
  font-weight: 650;
}
.team-name {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 1.8px;
  overflow-wrap: anywhere;
}
.key {
  font:
    13px/1.95 ui-monospace,
    monospace;
  overflow-wrap: anywhere;
  background: var(--inset);
  border: 1px solid var(--line);
  padding: 18px;
  border-radius: 18px;
  display: block;
}
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  padding: 24px 42px;
  border-top: 1px solid var(--line);
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--faint);
}
footer span {
  letter-spacing: 0;
}
footer a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
#toast {
  position: fixed;
  bottom: 25px;
  left: calc(50% + 126px);
  transform: translate(-50%, 15px);
  background: var(--action);
  color: var(--action-ink);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 15px 23px;
  max-width: 85vw;
  font-size: 14px;
  line-height: 1.85;
  border-radius: 22px;
  opacity: 0;
  transition: 0.2s;
  pointer-events: none;
  z-index: 20;
}
#toast.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
dialog {
  border: 1px solid var(--edge);
  border-radius: 30px;
  max-width: 570px;
  width: calc(100vw - 32px);
  max-height: calc(100dvh - 32px);
  overflow: auto;
  padding: 32px;
  background: var(--solid);
  color: var(--ink);
  box-shadow: 0 24px 90px #0004;
}
dialog::backdrop {
  background: #10192370;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}
.loading {
  padding: 64px 20px;
  text-align: center;
  color: var(--muted);
}
.progress-line {
  height: 3px;
  background: var(--inset);
  margin: 17px 0 27px;
}
.progress-line > span {
  height: 100%;
  display: block;
  background: var(--accent);
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}
@media (max-width: 1150px) {
  :root {
    --sidebar-width: 220px;
  }
  .sidebar {
    padding: 25px 13px;
  }
  .brand {
    font-size: 18px;
  }
  .brand small {
    font-size: 8px;
  }
  .topbar {
    padding-inline: 27px;
  }
  main {
    padding: 32px 27px 54px;
  }
  .domain-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .stat {
    padding: 18px;
  }
  .stats {
    gap: 11px;
  }
  .two-col {
    grid-template-columns: 1fr;
  }
  .hero {
    grid-template-columns: minmax(0, 1fr) 155px;
    padding: 28px;
  }
  .orbit {
    width: 128px;
    height: 128px;
    outline-offset: 12px;
  }
  .orbit strong {
    font-size: 53px;
  }
  .orbit small {
    font-size: 8px;
  }
  #toast {
    left: calc(50% + 110px);
  }
}
@media (max-width: 900px) {
  :root {
    --sidebar-width: 0px;
  }
  .sidebar {
    position: relative;
    inset: auto;
    width: auto;
    margin: 14px 16px 0;
    padding: 18px 18px 9px;
    display: block;
    border-radius: 26px;
    overflow: visible;
  }
  .brand {
    font-size: 19px;
  }
  .brand-mark {
    width: 40px;
    height: 44px;
    font-size: 25px;
  }
  .brand small {
    font-size: 8px;
  }
  .side-label,
  .side-bottom {
    display: none;
  }
  nav {
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    gap: 6px;
    padding: 13px 0 4px;
    scrollbar-width: thin;
  }
  nav a {
    white-space: nowrap;
    min-height: 44px;
    padding: 10px 12px;
    font-size: 12px;
    gap: 8px;
    flex-shrink: 0;
  }
  nav a > span:first-child {
    font-size: 17px;
    width: auto;
  }
  .nav-badge {
    margin-left: 3px;
  }
  .workspace {
    margin-left: 0;
  }
  .topbar {
    min-height: 68px;
    padding: 12px 26px;
    font-size: 12px;
  }
  main {
    max-width: 850px;
    padding: 28px 25px 48px;
  }
  h1 {
    font-size: 30px;
  }
  .two-col {
    grid-template-columns: 1fr;
  }
  .hero {
    grid-template-columns: minmax(0, 1fr) 160px;
  }
  .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .stat strong {
    font-size: 29px;
  }
  .stat .tiny {
    font-size: 10px;
  }
  .question-card {
    padding: 28px;
  }
  #toast {
    left: 50%;
  }
  footer {
    padding-inline: 25px;
  }
}
@media (max-width: 640px) {
  .sidebar {
    margin: 10px 12px 0;
    padding: 17px 14px 8px;
  }
  .topbar {
    padding: 12px 20px;
    gap: 10px;
    flex-wrap: wrap;
  }
  .topbar > div {
    gap: 7px;
  }
  #user-label {
    display: none;
  }
  .avatar {
    display: flex;
    width: 44px;
    height: 44px;
  }
  #theme-select {
    font-size: 12px;
    min-width: 92px;
  }
  main {
    padding: 26px 18px 40px;
  }
  h1 {
    font-size: 26px;
    letter-spacing: -0.5px;
  }
  .page-head {
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
  }
  .page-head p {
    font-size: 13px;
  }
  .date-tag {
    font-size: 10px;
    padding: 8px 12px;
  }
  .hero {
    grid-template-columns: 1fr;
    padding: 25px;
    border-radius: 28px;
  }
  .hero-right {
    display: none;
  }
  .hero h2 {
    font-size: 26px;
  }
  .hero p {
    font-size: 13px;
  }
  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 30px;
  }
  .stat {
    padding: 19px;
    border-radius: 24px;
  }
  .stat > span {
    margin-bottom: 10px;
  }
  .stat .tiny {
    font-size: 11px;
  }
  .domain-grid {
    gap: 12px;
  }
  .domain-card {
    padding: 20px;
    border-radius: 24px;
  }
  .domain-card p {
    min-height: 42px;
    font-size: 11px;
    line-height: 1.8;
  }
  .domain-card h3 {
    font-size: 15px;
  }
  .domain-card h3 .small {
    display: block;
    font-size: 12px;
    margin-top: 4px;
  }
  .domain-foot {
    font-size: 10px;
    flex-wrap: wrap;
  }
  .panel {
    padding: 23px;
    border-radius: 26px;
  }
  .filters {
    padding: 19px;
    gap: 14px;
  }
  .filters label {
    flex: 1;
    min-width: 115px;
  }
  .filters select,
  .filters input {
    width: 100%;
    min-width: 0;
  }
  .filters input,
  textarea,
  .form-grid input {
    font-size: 16px;
  }
  .question-card {
    padding: 22px;
    border-radius: 26px;
  }
  .question-card h2 {
    font-size: 18px;
  }
  .option {
    padding: 15px;
    font-size: 14px;
    border-radius: 19px;
  }
  .question-tools {
    flex-wrap: wrap;
  }
  .question-tools > .actions {
    margin-left: auto;
  }
  .explanation {
    font-size: 13px;
    gap: 11px;
  }
  .question-card pre,
  .topic-body pre {
    font-size: 12px;
    padding: 17px;
  }
  .topic summary {
    padding: 19px;
    gap: 12px;
  }
  .topic summary strong {
    font-size: 14px;
  }
  .topic-body {
    padding: 0 19px 21px;
  }
  .topic summary .pill {
    font-size: 10px;
    padding-inline: 7px;
  }
  .reason {
    padding: 18px;
    font-size: 13px;
  }
  .leaderboard td,
  .leaderboard th {
    padding: 14px 8px;
  }
  .leaderboard {
    font-size: 12px;
  }
  .timer {
    font-size: 18px;
    min-width: 90px;
  }
  footer {
    padding: 18px;
    flex-wrap: wrap;
    font-size: 10px;
  }
  .source-links {
    font-size: 12px;
  }
  .section-title {
    align-items: flex-start;
    flex-wrap: wrap;
  }
  .section-title h2 {
    font-size: 18px;
  }
  .page-head .actions {
    justify-content: flex-start;
  }
  .list-row {
    gap: 12px;
  }
  .list-row strong {
    font-size: 13px;
  }
  .note-box {
    padding: 17px 18px;
  }
  dialog {
    padding: 25px;
  }
  .result-score {
    padding: 20px 8px;
  }
}
@media (max-width: 440px) {
  .hero .actions {
    gap: 9px;
  }
  .hero .button {
    padding-inline: 14px;
  }
  .domain-card {
    padding: 18px;
  }
  .stat {
    padding: 17px;
  }
  .stat strong {
    font-size: 28px;
  }
  .domain-icon {
    width: 36px;
    height: 36px;
    border-radius: 13px;
  }
  .question-head {
    align-items: flex-start;
  }
  .question-card > .section-title .actions {
    gap: 6px;
  }
  .question-nav {
    gap: 7px;
  }
  .list-row {
    align-items: flex-start;
  }
  .list-row > .button {
    padding-inline: 11px;
  }
  .topbar {
    padding-inline: 18px;
  }
  .source-links {
    display: block;
  }
  .source-links a {
    display: flex;
  }
  .explanation {
    display: block;
  }
  .explanation b {
    display: block;
    margin-bottom: 3px;
  }
  .form-grid {
    gap: 17px;
  }
}
@media (max-width: 360px) {
  main {
    padding-inline: 12px;
  }
  .sidebar {
    margin-inline: 8px;
  }
  .hero,
  .panel,
  .question-card {
    padding: 20px;
  }
  .domain-grid {
    grid-template-columns: 1fr;
  }
  .domain-card p {
    min-height: 0;
  }
  .domain-card h3 .small {
    display: inline;
  }
  .stats {
    gap: 9px;
  }
  .stat {
    padding: 15px;
  }
  .stat small {
    margin-left: 4px;
    font-size: 10px;
  }
  .topbar {
    padding-inline: 14px;
  }
  .question-tools > .actions {
    margin-left: 0;
  }
  .question-head .small {
    font-size: 11px;
  }
  .topic summary {
    flex-wrap: wrap;
  }
  .brand {
    font-size: 18px;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .button:hover,
  .domain-card:hover {
    transform: none;
  }
}
@media (prefers-reduced-transparency: reduce) {
  :root {
    --surface: var(--solid);
    --glass-blur: none;
  }
  body {
    background: var(--bg);
  }
  .hero {
    background: var(--solid);
  }
  dialog::backdrop {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: #101923c0;
  }
}
@media (prefers-contrast: more) {
  :root {
    --muted: var(--ink);
    --faint: var(--ink);
    --surface: var(--solid);
    --glass-blur: none;
    --line: var(--ink);
    --shadow: none;
  }
  body {
    background: var(--bg);
  }
  .hero {
    background: var(--solid);
  }
  .pill,
  .button,
  .option,
  .topic,
  .panel,
  .stat,
  .domain-card {
    border-width: 2px;
  }
  a {
    text-decoration: underline;
    text-underline-offset: 3px;
  }
}
@media (forced-colors: active) {
  body {
    background: Canvas;
    color: CanvasText;
  }
  .sidebar,
  .topbar,
  .hero,
  .panel,
  .stat,
  .domain-card,
  .filters,
  .question-card,
  .topic,
  .reason,
  .note-box,
  .orbit {
    background: Canvas;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-color: CanvasText;
  }
  .button,
  .option,
  nav a,
  .question-nav button,
  .pill,
  input,
  select,
  textarea,
  .check-controls button {
    background: Canvas;
    color: CanvasText;
    border: 1px solid ButtonText;
  }
  .option.selected,
  .question-nav button.current,
  nav a.active,
  .check-controls button.chosen {
    border: 3px solid Highlight;
  }
  .bar > span,
  .progress-line > span {
    background: Highlight;
  }
  .orbit:before,
  .orbit:after {
    display: none;
  }
  :focus-visible {
    outline: 3px solid Highlight;
  }
}