:root {
  color-scheme: light;
  --bg: #f6f3ee;
  --surface: #fffdf8;
  --surface-strong: #101820;
  --control: #fff;
  --soft: #faf6ee;
  --ink: #172026;
  --muted: #65727d;
  --line: #d9d1c4;
  --accent: #0f766e;
  --accent-strong: #0b5f59;
  --warn: #b45309;
  --good: #047857;
  --bad: #b91c1c;
  --code: #151515;
  --code-line: #e8e1d6;
  --code-fg: #f7f7ef;
  --hero-bg: linear-gradient(135deg, #fffdf8 0%, #f7efe3 52%, #eef7f5 100%);
  --hero-text: #3d4951;
  --terminal-bar: #202020;
  --terminal-border: #333;
  --selected-bg: #effaf7;
  --option-active: #e7f7f2;
  --good-bg: #d1fae5;
  --bad-bg: #fff1f1;
  --warn-bg: #fff8ed;
  --explanation-bg: #effaf7;
  --explanation-text: #314147;
  --shadow: 0 18px 45px rgba(36, 28, 20, 0.12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #071014;
  --surface: #0d171d;
  --surface-strong: #e6edf3;
  --control: #101b23;
  --soft: #0f1a21;
  --ink: #e6edf3;
  --muted: #91a4b7;
  --line: #263844;
  --accent: #21c7a8;
  --accent-strong: #67e8c9;
  --warn: #f6c177;
  --good: #56d364;
  --bad: #ff7b72;
  --code: #05080c;
  --code-line: #263844;
  --code-fg: #d8ffe9;
  --hero-bg: linear-gradient(135deg, #081116 0%, #0b1820 52%, #0e241f 100%);
  --hero-text: #b7c7d4;
  --terminal-bar: #090f14;
  --terminal-border: #1c2b34;
  --selected-bg: #0d2b29;
  --option-active: #0e3531;
  --good-bg: #0f2b1b;
  --bad-bg: #2b1518;
  --warn-bg: #2a2114;
  --explanation-bg: #0d2628;
  --explanation-text: #c8d8dd;
  --shadow: 0 20px 55px rgba(0, 0, 0, 0.36);
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.app-shell {
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 24px;
}

.hero {
  min-height: 190px;
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) minmax(320px, 1.28fr);
  gap: 22px;
  align-items: stretch;
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--hero-bg);
  box-shadow: var(--shadow);
}

.hero-copy {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-controls {
  width: fit-content;
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 16px;
}

.theme-toggle {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--control);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.theme-toggle::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(33, 199, 168, 0.6);
}

.theme-toggle:hover,
.language-switch button:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.language-switch {
  min-height: 34px;
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(38px, 1fr));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--control);
}

.language-switch button {
  min-height: 32px;
  padding: 0 10px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.language-switch button[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2.25rem, 6vw, 4.4rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.hero-text {
  max-width: 560px;
  margin: 12px 0 0;
  color: var(--hero-text);
  font-size: 1rem;
  line-height: 1.5;
}

.hero-terminal,
.code-block {
  overflow: hidden;
  border: 1px solid var(--terminal-border);
  background: var(--code);
  color: var(--code-fg);
}

.hero-terminal {
  min-height: 155px;
  align-self: stretch;
  display: flex;
  flex-direction: column;
}

.terminal-bar {
  height: 34px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  border-bottom: 1px solid var(--terminal-border);
  background: var(--terminal-bar);
}

.terminal-bar span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #d45b50;
}

.terminal-bar span:nth-child(2) {
  background: #d99d26;
}

.terminal-bar span:nth-child(3) {
  background: #3a9d6f;
}

pre {
  margin: 0;
  white-space: pre-wrap;
}

code {
  font-family: "Cascadia Code", "Fira Code", Consolas, monospace;
  font-size: 0.95rem;
  line-height: 1.65;
}

.hero-terminal pre {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 18px;
}

.workspace {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 300px;
  gap: 18px;
  margin-top: 22px;
  align-items: start;
}

.panel,
.quiz-panel {
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(36, 28, 20, 0.08);
}

.panel {
  overflow: hidden;
  padding: 18px;
}

.sidebar {
  min-width: 0;
  grid-column: 1;
  grid-row: 1 / span 2;
  display: grid;
  gap: 18px;
}

.quiz-panel {
  grid-column: 2;
  grid-row: 1;
}

.competition {
  grid-column: 3;
  grid-row: 1 / span 2;
}

.panel h2,
.quiz-panel h2,
.leaderboard h2 {
  margin: 0 0 14px;
  font-size: 1.1rem;
  line-height: 1.25;
}

label {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--control);
  color: var(--ink);
}

input:focus,
select:focus,
button:focus-visible {
  outline: 3px solid rgba(15, 118, 110, 0.24);
  outline-offset: 2px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.question-deck {
  padding: 18px;
}

.deck-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: start;
}

.deck-head > div {
  min-width: 0;
}

.deck-head h2 {
  margin-bottom: 0;
}

.quick-zone {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.quick-group[hidden] {
  display: none;
}

.filter-label {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.quick-filter-row {
  width: 100%;
  max-width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  overflow: visible;
}

.quick-filter-row .chip {
  flex: 0 0 auto;
  min-height: 36px;
  padding: 7px 10px;
  white-space: nowrap;
}

.question-deck .question-toolbar {
  align-items: start;
}

.question-deck .pager {
  flex: 0 0 auto;
}

.search-row {
  margin-top: 14px;
}

.question-browser .search-row {
  margin-top: 0;
}

.question-browser {
  min-height: 196px;
}

.filter-group.compact {
  margin-top: -4px;
}

.chip,
.option-button,
.primary-button,
.secondary-button,
.icon-button {
  min-height: 40px;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.chip {
  padding: 8px 10px;
  border-color: var(--line);
  background: var(--control);
  color: var(--ink);
  font-size: 0.84rem;
  font-weight: 800;
}

.chip[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--option-active);
  color: var(--accent-strong);
}

.question-list,
.leaderboard ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.question-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 12px;
}

.question-list button {
  width: 100%;
  min-height: 74px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--control);
  color: var(--ink);
  text-align: left;
}

.question-list button[aria-current="true"] {
  border-color: var(--accent);
  background: var(--selected-bg);
}

.question-list strong,
.question-list small {
  display: block;
}

.question-list small {
  margin-top: 3px;
  color: var(--muted);
}

.question-toolbar,
.pager {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
}

.question-toolbar {
  margin-top: 14px;
}

.question-toolbar span,
.pager span {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
  white-space: nowrap;
}

.pager {
  flex: 0 0 auto;
  margin-top: 0;
}

.compact-button {
  min-height: 34px;
  padding: 7px 9px;
  font-size: 0.84rem;
}

.quiz-panel {
  min-height: 640px;
  padding: 22px;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
}

.quiz-header h2 {
  margin-bottom: 0;
  font-size: clamp(1.3rem, 3vw, 2.1rem);
}

.format-badge {
  flex: 0 0 auto;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--warn-bg);
  color: var(--warn);
  font-size: 0.82rem;
  font-weight: 900;
}

.code-block {
  min-height: 190px;
  margin: 22px 0;
  padding: 20px;
  border-radius: 6px;
}

.answer-area {
  display: grid;
  gap: 10px;
}

.option-button {
  width: 100%;
  min-height: 54px;
  padding: 12px 14px;
  border-color: var(--line);
  background: var(--control);
  color: var(--ink);
  text-align: left;
}

.option-button:hover,
.question-list button:hover,
.chip:hover {
  transform: translateY(-1px);
}

.option-button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--option-active);
}

.option-button.correct {
  border-color: var(--good);
  background: var(--good-bg);
  color: #064e3b;
}

html[data-theme="dark"] .option-button.correct {
  color: var(--ink);
}

.option-button.wrong {
  border-color: var(--bad);
  background: var(--bad-bg);
}

.reveal-box {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--control);
}

.answer-output {
  min-height: 54px;
  padding: 14px;
  border-radius: 6px;
  background: #171717;
  color: var(--code-line);
  font-family: "Cascadia Code", Consolas, monospace;
}

.action-row,
.self-score-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.primary-button,
.secondary-button {
  padding: 10px 14px;
  font-weight: 900;
}

.primary-button {
  background: var(--accent);
  color: #fff;
}

.panel > .primary-button {
  margin-top: 14px;
}

.primary-button:hover {
  background: var(--accent-strong);
}

.secondary-button {
  border-color: var(--line);
  background: var(--control);
  color: var(--ink);
}

.secondary-button:hover {
  border-color: var(--accent);
}

.explanation {
  margin-top: 18px;
  padding: 16px;
  border-left: 4px solid var(--accent);
  background: var(--explanation-bg);
}

.explanation h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.explanation p {
  margin: 0;
  color: var(--explanation-text);
  line-height: 1.65;
}

.competition {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 18px;
}

.leaderboard {
  position: static;
}

.leaderboard-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: start;
}

.section-head h3 {
  margin: 0;
  font-size: 1.05rem;
}

.up-next {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.related-card {
  min-height: 94px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--control);
  color: var(--ink);
  text-align: left;
}

.related-card strong,
.related-card small {
  display: block;
}

.related-card strong {
  line-height: 1.3;
}

.related-card small {
  margin-top: 8px;
  color: var(--muted);
}

.activity-board {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.activity-kicker {
  align-self: start;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.activity-grid {
  display: grid;
  grid-template-columns: repeat(20, minmax(0, 1fr));
  gap: 5px;
  margin-top: 14px;
}

.activity-cell {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--soft);
}

.activity-cell[data-level="1"] {
  border-color: rgba(33, 199, 168, 0.35);
  background: rgba(33, 199, 168, 0.18);
}

.activity-cell[data-level="2"] {
  border-color: rgba(33, 199, 168, 0.58);
  background: rgba(33, 199, 168, 0.34);
}

.activity-cell[data-level="3"] {
  border-color: var(--accent);
  background: var(--accent);
}

.activity-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 12px;
  margin-top: 14px;
}

.activity-card {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--control);
}

.activity-card h4 {
  margin: 0 0 12px;
  font-size: 0.95rem;
}

.topic-pulse,
.recent-answers {
  display: grid;
  gap: 9px;
}

.topic-row {
  display: grid;
  grid-template-columns: minmax(0, 110px) minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.topic-meter {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--soft);
}

.topic-meter span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.recent-item {
  width: 100%;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.recent-item:hover strong,
.recent-item:focus-visible strong {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.recent-mark {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--bad-bg);
  color: var(--bad);
  font-size: 0.78rem;
  font-weight: 900;
}

.recent-mark.correct {
  background: var(--good-bg);
  color: var(--good);
}

.recent-item strong,
.recent-item small {
  display: block;
}

.recent-item strong {
  font-size: 0.88rem;
  line-height: 1.3;
}

.recent-item small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.78rem;
}

.support-strip {
  grid-column: 2;
  display: block;
  min-height: 196px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
}

.donation-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 76px;
  gap: 12px;
  margin-bottom: 10px;
}

.donation-header-main {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  align-items: start;
}

.donation-title {
  grid-column: 1 / span 2;
  min-width: 0;
}

.donation-header .eyebrow {
  margin-bottom: 4px;
}

.donation-header strong {
  display: block;
  margin: 0;
}

.donation-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 76px;
  gap: 12px;
  align-items: start;
}

.donation-qr {
  width: 76px;
  height: 76px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--control);
}

.donation-qr img {
  width: 100%;
  height: 100%;
  display: block;
}

.donation-copy {
  min-width: 0;
}

.donation-details {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
}

.donation-field {
  min-width: 0;
  margin: 0;
  padding: 6px 7px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--control);
}

.donation-details dt {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
}

.donation-details dd {
  margin: 2px 0 0;
  font-size: 0.82rem;
  font-weight: 900;
  overflow-wrap: anywhere;
}

.donation-warning {
  margin: 8px 0 0;
  padding: 8px 10px;
  border: 1px solid rgba(185, 28, 28, 0.35);
  border-left: 4px solid var(--bad);
  border-radius: 6px;
  background: var(--bad-bg);
  color: var(--ink);
  font-size: 0.8rem;
  line-height: 1.35;
}

.donation-warning strong {
  display: inline;
  color: var(--bad);
}

.donation-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 8px;
}

.donation-copy-button {
  grid-column: 3;
  width: fit-content;
  min-height: 24px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  justify-self: end;
  gap: 7px;
  align-self: end;
  margin-bottom: 2px;
  padding: 2px 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 900;
  transition: color 160ms ease, transform 160ms ease;
}

.donation-copy-button::before {
  content: "";
  width: 9px;
  height: 10px;
  border: 1.5px solid currentColor;
  box-shadow: -3px 3px 0 -1.5px var(--soft), -3px 3px 0 0 currentColor;
  transform: translateY(-1px);
}

.donation-copy-button:hover:not(:disabled) {
  color: var(--accent);
  transform: translateY(-1px);
}

.donation-copy-button:disabled {
  color: var(--muted);
}

.donation-copy-button:disabled::before {
  box-shadow: -3px 3px 0 -1.5px var(--soft), -3px 3px 0 0 currentColor;
}

.donation-integrity,
.donation-footer small {
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 800;
}

.donation-integrity code {
  color: inherit;
  font-size: 0.76rem;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.run-panel {
  min-height: 360px;
}

.weak-panel {
  min-height: 196px;
}

.metric-grid div {
  min-height: 68px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
}

.metric-grid span {
  font-size: 1.45rem;
  font-weight: 900;
}

.metric-grid small {
  margin-top: -8px;
  color: var(--muted);
  font-size: 0.78rem;
}

.insight-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.insight-row strong {
  color: var(--ink);
  text-align: right;
}

.weak-list {
  display: grid;
  gap: 8px;
}

.weak-item {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--control);
  color: var(--ink);
  text-align: left;
}

.weak-item:hover,
.weak-item:focus-visible {
  border-color: var(--accent);
  background: var(--selected-bg);
  transform: translateY(-1px);
}

.weak-item strong {
  overflow-wrap: anywhere;
}

.weak-item span {
  flex: 0 0 auto;
  color: var(--bad);
  font-weight: 900;
}

.leaderboard-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 2px 0 12px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 900;
}

.leaderboard-tabs button {
  min-height: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.leaderboard-tabs button:not(:last-child)::after {
  content: "|";
  display: inline-block;
  margin: 0 6px;
  color: var(--muted);
  text-decoration: none;
}

.leaderboard-tabs button[aria-pressed="true"] {
  color: var(--accent-strong);
}

.icon-button {
  width: 38px;
  min-width: 38px;
  padding: 0;
  border-color: var(--line);
  background: var(--control);
  color: var(--bad);
  font-size: 1.3rem;
  font-weight: 700;
}

.leaderboard li {
  display: grid;
  grid-template-columns: minmax(34px, auto) minmax(0, 1fr) max-content;
  gap: 8px;
  align-items: center;
  padding: 11px 0;
  border-top: 1px solid var(--line);
}

.leaderboard strong,
.leaderboard span {
  min-width: 0;
  overflow-wrap: break-word;
}

.leaderboard .leaderboard-empty {
  display: block;
}

.leaderboard .leaderboard-empty strong,
.leaderboard .leaderboard-empty small {
  display: block;
}

.leaderboard .leaderboard-empty strong {
  margin-bottom: 6px;
}

.leaderboard small,
.fine-print {
  color: var(--muted);
}

.fine-print {
  margin: 16px 0 0;
  font-size: 0.82rem;
  line-height: 1.45;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.site-footer a {
  color: var(--accent-strong);
  font-weight: 800;
  text-decoration: none;
}

@media (max-width: 1120px) {
  .workspace {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .competition {
    position: static;
    grid-column: 1 / -1;
    grid-row: auto;
  }

  .support-strip {
    grid-column: 2;
  }

  .competition {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .app-shell {
    padding: 14px;
  }

  .hero,
  .workspace {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 22px;
  }

  .quiz-header {
    display: grid;
  }

  .format-badge {
    width: fit-content;
  }

  .competition,
  .related-list,
  .activity-columns,
  .donation-body,
  .donation-details {
    grid-template-columns: 1fr;
  }

  .donation-header {
    grid-template-columns: 1fr;
  }

  .donation-header-main {
    grid-template-columns: 1fr;
  }

  .donation-title,
  .donation-copy-button {
    grid-column: auto;
  }

  .activity-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .donation-qr {
    width: 72px;
    height: 72px;
  }

  .support-strip {
    grid-column: auto;
    min-height: 0;
  }

  .question-browser,
  .run-panel,
  .weak-panel {
    min-height: 0;
  }

  .sidebar,
  .quiz-panel,
  .competition {
    grid-column: auto;
    grid-row: auto;
  }

  .sidebar {
    display: contents;
  }

  .sidebar > .panel:not(.question-deck):not(.question-browser) {
    order: 1;
  }

  .question-deck {
    order: 2;
  }

  .quiz-panel {
    order: 3;
  }

  .support-strip {
    order: 4;
  }

  .competition {
    order: 5;
  }

  .question-browser {
    order: 6;
  }

  .site-footer {
    display: grid;
  }
}