:root {
  color-scheme: light;
  --bottom-nav-height: 78px;
  --bg: #eef1ee;
  --ink: #172019;
  --muted: #6e756b;
  --soft: #f4f6f4;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-strong: #ffffff;
  --line: rgba(28, 37, 28, 0.11);
  --green: #16784f;
  --green-2: #45b36b;
  --blue: #246bba;
  --red: #c6463d;
  --yellow: #e4a11b;
  --violet: #7653d6;
  --shadow: 0 24px 64px rgba(39, 45, 35, 0.14);
  --shadow-soft: 0 12px 30px rgba(39, 45, 35, 0.09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #111511;
    --ink: #f4f1e9;
    --muted: #aab3a7;
    --soft: #171d17;
    --panel: rgba(27, 34, 27, 0.78);
    --panel-strong: #202820;
    --line: rgba(244, 241, 233, 0.12);
    --green: #63d38d;
    --green-2: #2faf63;
    --blue: #75aef4;
    --red: #ff7e75;
    --yellow: #f5c44d;
    --violet: #a48df1;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
    --shadow-soft: 0 12px 30px rgba(0, 0, 0, 0.26);
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #eef1ee;
  --ink: #172019;
  --muted: #6e756b;
  --soft: #f4f6f4;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-strong: #ffffff;
  --line: rgba(28, 37, 28, 0.11);
  --green: #16784f;
  --green-2: #45b36b;
  --blue: #246bba;
  --red: #c6463d;
  --yellow: #e4a11b;
  --shadow: 0 24px 64px rgba(39, 45, 35, 0.14);
  --shadow-soft: 0 12px 30px rgba(39, 45, 35, 0.09);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111511;
  --ink: #f4f1e9;
  --muted: #aab3a7;
  --soft: #171d17;
  --panel: rgba(27, 34, 27, 0.78);
  --panel-strong: #202820;
  --line: rgba(244, 241, 233, 0.12);
  --green: #63d38d;
  --green-2: #2faf63;
  --blue: #75aef4;
  --red: #ff7e75;
  --yellow: #f5c44d;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 12px 30px rgba(0, 0, 0, 0.26);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  min-height: 100%;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

body {
  width: 100%;
  max-width: 100%;
  min-height: 100dvh;
  margin: 0;
  overflow-x: hidden;
  overscroll-behavior-x: none;
  touch-action: manipulation;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  letter-spacing: 0;
}

body,
main,
section,
article,
header,
nav,
div,
p,
h1,
h2,
h3,
li,
span,
strong,
small {
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}

img,
svg,
video,
canvas,
iframe {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
  max-width: 100%;
}

button {
  min-height: 44px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--blue) 34%, transparent);
  outline-offset: 2px;
}

.app-shell {
  width: 100%;
  max-width: 100%;
  min-height: 100dvh;
  overflow-x: hidden;
  margin: 0 auto;
  padding-top: env(safe-area-inset-top);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

.screen {
  width: 100%;
  max-width: 430px;
  min-width: 0;
  min-height: 100dvh;
  margin: 0 auto;
  padding: 18px 16px calc(var(--bottom-nav-height) + 18px + env(safe-area-inset-bottom));
}

.loading-screen {
  display: grid;
  place-items: center;
}

.loading-card {
  display: grid;
  justify-items: center;
  gap: 14px;
  color: var(--muted);
  font-weight: 800;
}

.loading-orbit {
  width: 48px;
  height: 48px;
  border: 5px solid color-mix(in srgb, var(--green) 18%, transparent);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.top-bar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: -6px 0 12px;
  padding: 10px 0;
  background: var(--bg);
}

.header-icon-button {
  display: grid;
  width: 44px;
  min-height: 44px;
  flex: 0 0 44px;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  font-size: 1.25rem;
}

.home-progress {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-bottom: 18px;
  padding: 18px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.home-progress-item {
  min-width: 0;
  padding: 0 9px;
  border-right: 1px solid var(--line);
}

.home-progress-item:last-child {
  border-right: 0;
}

.home-progress-item > div:first-child {
  display: grid;
  gap: 5px;
  margin-bottom: 11px;
}

.home-progress-item span {
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 800;
}

.home-progress-item strong {
  white-space: nowrap;
  font-size: 1.16rem;
  line-height: 1;
}

.home-progress-item .progress-track {
  height: 6px;
}

.home-primary-actions,
.home-secondary-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.home-primary-actions {
  margin-bottom: 10px;
}

.home-action {
  display: grid;
  min-width: 0;
  min-height: 116px;
  align-content: center;
  justify-items: start;
  gap: 5px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  color: var(--ink);
  padding: 16px;
  text-align: left;
}

.home-action.primary {
  border-color: #246bba;
  background: #246bba;
  color: #ffffff;
}

.home-action.marathon {
  border-color: var(--green);
  background: var(--green);
  color: #ffffff;
}

.home-action.compact {
  min-height: 92px;
  grid-template-columns: 34px 1fr;
  align-items: center;
  align-content: center;
  column-gap: 10px;
}

.home-action.compact strong,
.home-action.compact small {
  grid-column: 2;
}

.home-action strong {
  overflow-wrap: anywhere;
  font-size: 1.08rem;
}

.home-action small {
  color: currentColor;
  opacity: 0.72;
  font-size: 0.76rem;
}

.home-action-icon {
  font-size: 1.3rem;
  font-weight: 900;
}

.ticket-list,
.topic-progress-list,
.settings-list,
.result-errors {
  display: grid;
  gap: 8px;
}

.ticket-row {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 26px;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 82px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  padding: 10px 12px 10px 10px;
  text-align: left;
}

.ticket-row.complete {
  border-color: color-mix(in srgb, var(--green) 54%, var(--line));
}

.ticket-row.errors {
  border-left: 4px solid var(--red);
}

.ticket-row.active {
  border-left: 4px solid var(--blue);
}

.ticket-number {
  display: grid;
  width: 46px;
  height: 52px;
  place-items: center;
  border-radius: 6px;
  background: color-mix(in srgb, var(--green) 14%, var(--soft));
  color: var(--green);
  font-size: 1.35rem;
  font-weight: 900;
}

.ticket-copy {
  display: grid;
  min-width: 0;
  gap: 3px;
}

.ticket-copy span,
.ticket-copy small {
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 0.75rem;
}

.ticket-state {
  color: var(--green);
  font-size: 1.25rem;
  font-weight: 900;
  text-align: center;
}

.mode-start,
.empty-mode {
  display: grid;
  min-height: 560px;
  align-content: center;
  justify-items: center;
  gap: 14px;
  text-align: center;
}

.mode-start p,
.empty-mode p {
  max-width: 32ch;
  margin-bottom: 8px;
  color: var(--muted);
}

.mode-start .grid,
.empty-mode .btn {
  width: 100%;
}

.mode-symbol {
  display: grid;
  width: 88px;
  height: 88px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: color-mix(in srgb, var(--green) 12%, var(--panel));
  color: var(--green);
  font-size: 2.1rem;
  font-weight: 900;
}

.topic-progress-row {
  display: grid;
  gap: 12px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  padding: 15px;
  text-align: left;
}

.topic-progress-row > div:first-child {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.topic-progress-row > div:first-child span {
  flex: 0 0 auto;
  color: var(--muted);
  font-weight: 800;
}

.topic-progress-row .progress-track {
  height: 8px;
}

.setting-row {
  display: flex;
  min-height: 70px;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  padding: 12px 14px;
  text-align: left;
}

.setting-row > span:first-child {
  display: grid;
  gap: 4px;
}

.setting-row small {
  color: var(--muted);
}

.setting-row select {
  max-width: 132px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-strong);
  color: var(--ink);
  padding: 8px;
}

.setting-row.danger strong,
.setting-row.danger > span:last-child {
  color: var(--red);
}

.resume-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.resume-strip > div {
  display: grid;
  gap: 4px;
}

.resume-strip span {
  color: var(--muted);
  font-size: 0.78rem;
}

.task-mode-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.result-summary {
  display: grid;
  gap: 18px;
  margin-bottom: 14px;
  padding: 22px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.result-percent {
  font-size: 2.5rem;
  line-height: 1;
  text-align: center;
}

.result-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(64px, 1fr));
  gap: 8px;
}

.result-metrics span {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 0.72rem;
  text-align: center;
}

.result-metrics strong {
  color: var(--ink);
  font-size: 1.2rem;
}

.result-errors {
  margin: 14px 0;
}

.result-error-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.result-error-row > div {
  display: grid;
  gap: 5px;
}

.result-error-row span {
  color: var(--muted);
  font-size: 0.76rem;
}

.favorite-icon-button {
  width: 44px;
  min-height: 44px;
  border: 0;
  border-radius: 50%;
  background: var(--soft);
  color: var(--muted);
  font-size: 1.2rem;
}

.favorite-icon-button.active {
  color: var(--yellow);
}

.knowledge-question-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.knowledge-question-row:last-child {
  border-bottom: 0;
}

.perfect-result {
  padding: 18px;
  border: 1px solid color-mix(in srgb, var(--green) 48%, var(--line));
  border-radius: 8px;
  color: var(--green);
  font-weight: 850;
  text-align: center;
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 11px;
}

.brand-mark {
  display: grid;
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--green) 36%, var(--line));
  border-radius: 8px;
  background: var(--green);
  color: #ffffff;
  box-shadow: var(--shadow-soft);
  font-size: 1.35rem;
  font-weight: 950;
}

.title-block {
  min-width: 0;
}

.eyebrow,
.micro {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  overflow-wrap: anywhere;
  font-size: 1.38rem;
  line-height: 1.12;
}

h2 {
  margin-bottom: 10px;
  font-size: 1.1rem;
  line-height: 1.18;
}

h3 {
  margin-bottom: 8px;
  font-size: 0.98rem;
}

p {
  line-height: 1.45;
}

.hero {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 18px;
  margin-bottom: 14px;
  padding: 20px;
  border: 1px solid color-mix(in srgb, var(--green) 18%, var(--line));
  border-radius: 8px;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero-title {
  max-width: 12ch;
  margin-bottom: 8px;
  font-size: 2.35rem;
  line-height: 0.98;
}

.hero-copy {
  max-width: 34ch;
  margin-bottom: 0;
  color: var(--muted);
  font-weight: 650;
}

.grid {
  display: grid;
  gap: 12px;
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
}

.card,
.metric,
.topic-card,
.action-card,
.task-card,
.question-card,
.profile-card,
.search-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
}

.panel,
.profile-card {
  padding: 16px;
}

.metric {
  min-width: 0;
  min-height: 82px;
  overflow: hidden;
  padding: 13px 12px;
}

.metric span {
  display: block;
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
}

.metric strong {
  display: block;
  margin-top: 5px;
  font-size: 1.32rem;
  line-height: 1;
}

.metric small {
  display: block;
  margin-top: 6px;
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 0.72rem;
}

.progress-track {
  overflow: hidden;
  height: 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--line) 64%, transparent);
}

.progress-track > span {
  display: block;
  width: var(--value, 0%);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green), var(--yellow));
  transition: width 0.35s ease;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel-strong);
  color: var(--ink);
  padding: 11px 14px;
  box-shadow: var(--shadow-soft);
  text-decoration: none;
  font-weight: 850;
}

.btn.primary {
  border-color: color-mix(in srgb, var(--green) 42%, transparent);
  background: linear-gradient(145deg, var(--green), color-mix(in srgb, var(--green) 68%, var(--blue)));
  color: #ffffff;
}

.btn.subtle {
  background: color-mix(in srgb, var(--panel-strong) 72%, transparent);
  box-shadow: none;
}

.btn.danger {
  border-color: color-mix(in srgb, var(--red) 34%, var(--line));
  color: var(--red);
}

.icon {
  font-size: 1.05rem;
  line-height: 1;
}

.learning-map {
  display: grid;
  gap: 12px;
}

.topic-card {
  position: relative;
  display: grid;
  grid-template-columns: 54px 1fr auto;
  gap: 12px;
  width: 100%;
  padding: 14px;
  color: var(--ink);
  text-align: left;
}

.topic-icon,
.achievement-icon {
  display: grid;
  width: 54px;
  height: 54px;
  place-items: center;
  border-radius: 18px;
  background: color-mix(in srgb, var(--accent, var(--green)) 18%, var(--panel-strong));
  color: var(--accent, var(--green));
  font-size: 1.35rem;
  font-weight: 950;
}

.topic-card h3,
.task-card h3 {
  margin-bottom: 5px;
}

.topic-meta,
.meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.topic-level {
  align-self: center;
  min-width: 54px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent, var(--green)) 14%, transparent);
  color: var(--accent, var(--green));
  padding: 7px 10px;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 950;
}

.action-card {
  display: grid;
  gap: 12px;
  width: 100%;
  padding: 15px;
  color: var(--ink);
  text-align: left;
}

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

.practice-grid .action-card {
  min-height: 140px;
}

.search-panel {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
}

.field {
  display: grid;
  gap: 6px;
}

.field span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.field input,
.field select {
  min-height: 48px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel-strong);
  color: var(--ink);
  padding: 11px 13px;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
}

.segmented.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.mode-picker,
.mode-summary {
  display: grid;
  gap: 12px;
}

.mode-summary h2,
.mode-summary p {
  margin-bottom: 0;
}

.segment {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-strong);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 850;
}

.segment.active {
  border-color: color-mix(in srgb, var(--green) 42%, var(--line));
  background: color-mix(in srgb, var(--green) 16%, var(--panel-strong));
  color: var(--green);
}

.question-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.question-row {
  display: grid;
  gap: 8px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  padding: 13px;
  color: var(--ink);
  text-align: left;
}

.question-row strong {
  line-height: 1.26;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  background: color-mix(in srgb, var(--panel-strong) 84%, var(--green) 16%);
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 850;
}

.question-card {
  display: grid;
  min-width: 0;
  gap: 16px;
  padding: 17px;
}

.question-text {
  margin-bottom: 0;
  font-size: 1.42rem;
  font-weight: 950;
  line-height: 1.18;
}

.answer-box,
.code-box,
.explain-section {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--panel-strong) 78%, var(--bg) 22%);
  padding: 14px;
  line-height: 1.5;
}

.answer-box {
  display: grid;
  gap: 12px;
}

.answer-box details,
.explain-section {
  box-shadow: none;
}

.explain-section summary {
  cursor: pointer;
}

.explain-section ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

.explain-section ol {
  margin: 8px 0 0;
  padding-left: 22px;
}

.rich-details {
  display: grid;
  gap: 12px;
}

.explain-section h3 {
  margin-bottom: 6px;
}

.code-box {
  overflow-x: auto;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.88rem;
  white-space: pre-wrap;
}

.code-card {
  overflow: hidden;
  margin: 0;
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--line));
  border-radius: 20px;
  background: #101418;
  color: #eef6ff;
  box-shadow: var(--shadow-soft);
}

.code-card figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 42px;
  padding: 8px 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.06);
  color: #b8c7d9;
  font-size: 0.78rem;
  font-weight: 850;
}

.code-card pre {
  overflow-x: auto;
  margin: 0;
  padding: 14px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.86rem;
  line-height: 1.55;
  white-space: pre;
}

.copy-code {
  min-height: 32px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  color: #eef6ff;
  padding: 5px 9px;
  font-size: 0.76rem;
  font-weight: 850;
}

.tok-key {
  color: #83c9ff;
}

.tok-api {
  color: #ffd166;
}

.visual-card {
  overflow: hidden;
  margin: 12px 0 0;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
}

.visual-card img {
  display: block;
  width: 100%;
  height: auto;
}

.visual-card figcaption {
  padding: 9px 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.thought-input {
  width: 100%;
  min-height: 150px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
  color: var(--ink);
  padding: 12px;
  line-height: 1.45;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  padding: 12px;
  color: var(--ink);
  text-align: left;
}

.option-list {
  gap: 9px;
}

.option-marker {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: color-mix(in srgb, var(--panel-strong) 76%, var(--bg));
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 950;
}

.option > span:last-child {
  min-width: 0;
  flex: 1 1 auto;
  overflow-wrap: anywhere;
}

.option:disabled {
  cursor: default;
  opacity: 1;
}

.option.selected:not(.correct):not(.incorrect) {
  border-color: var(--blue);
  background: color-mix(in srgb, var(--blue) 8%, var(--panel-strong));
}

.option.selected:not(.correct):not(.incorrect) .option-marker {
  border-color: var(--blue);
  background: var(--blue);
  color: #ffffff;
}

.option.correct {
  border-color: color-mix(in srgb, var(--green) 78%, var(--line));
  background: color-mix(in srgb, var(--green) 17%, var(--panel-strong));
}

.option.incorrect {
  border-color: color-mix(in srgb, var(--red) 78%, var(--line));
  background: color-mix(in srgb, var(--red) 15%, var(--panel-strong));
}

.option.correct .option-marker {
  border-color: var(--green);
  background: var(--green);
  color: #ffffff;
}

.option.incorrect .option-marker {
  border-color: var(--red);
  background: var(--red);
  color: #ffffff;
}

.choice-explanation-wrap {
  display: grid;
  min-width: 0;
  gap: 0;
}

.explanation-toggle {
  width: 100%;
  min-height: 46px;
  padding: 10px 2px;
  border: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--green);
  font-weight: 850;
  text-align: left;
}

.choice-explanation-collapse {
  min-width: 0;
  overflow: hidden;
  opacity: 0;
  transition: height 250ms ease, opacity 220ms ease;
  will-change: height, opacity;
}

.choice-explanation-collapse.is-open {
  opacity: 1;
}

.choice-explanation {
  display: grid;
  min-width: 0;
  gap: 0;
  padding: 0 2px;
  line-height: 1.55;
}

.choice-explanation > section {
  min-width: 0;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.choice-explanation h3 {
  margin-bottom: 7px;
  font-size: 0.95rem;
}

.choice-explanation p,
.choice-explanation ul,
.choice-explanation ol {
  margin-bottom: 0;
}

.choice-explanation p + p {
  margin-top: 12px;
}

.choice-explanation h4 {
  margin: 16px 0 7px;
  font-size: 0.86rem;
}

.choice-explanation ul,
.choice-explanation ol {
  padding-left: 21px;
}

.choice-explanation li + li {
  margin-top: 7px;
}

.choice-explanation .code-card {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  margin-top: 10px;
  border-radius: 8px;
}

.choice-explanation .visual-card {
  border-radius: 8px;
}

@media (prefers-reduced-motion: reduce) {
  .choice-explanation-collapse {
    transition-duration: 1ms;
  }
}

.answer-v4 {
  gap: 14px;
  border: 0;
  border-radius: 0;
  background: transparent;
  padding: 0;
}

.result-status {
  margin: 0;
  font-size: 1.12rem;
}

.short-answer {
  padding: 13px 14px;
  border-left: 4px solid var(--green);
  background: color-mix(in srgb, var(--green) 8%, var(--panel-strong));
}

.short-answer h3,
.short-answer p {
  margin-bottom: 0;
}

.short-answer p {
  margin-top: 7px;
}

.detailed-disclosure {
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--line));
  border-radius: 14px;
  background: var(--panel-strong);
  padding: 0;
}

.detailed-disclosure > summary {
  padding: 13px 14px;
  color: var(--blue);
  list-style-position: inside;
}

.detail-content {
  display: grid;
  gap: 18px;
  padding: 4px 14px 16px;
  border-top: 1px solid var(--line);
}

.detail-content > section {
  padding-top: 14px;
}

.detail-content h3,
.detail-content p {
  margin-bottom: 0;
}

.detail-content p,
.detail-content li {
  line-height: 1.55;
}

.review-accordion {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.review-accordion summary {
  cursor: pointer;
}

.option-reasons {
  display: grid;
  gap: 13px;
  padding-left: 20px;
}

.option-reasons li span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
}

.interview-answer {
  padding: 13px;
  border-left: 4px solid var(--yellow);
  background: color-mix(in srgb, var(--yellow) 9%, var(--panel-strong));
}

.answer-resources {
  display: grid;
  gap: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}

.answer-resources a {
  color: var(--blue);
  font-weight: 850;
}

.result-ok {
  color: var(--green);
}

.result-bad {
  color: var(--red);
}

.task-card {
  display: grid;
  gap: 10px;
  width: 100%;
  padding: 15px;
  color: var(--ink);
  text-align: left;
}

.task-card h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.25;
}

.task-card > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.task-card-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
}

.task-card-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 750;
}

.task-state {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
}

.task-state.in-progress { color: var(--blue); }
.task-state.solved,
.task-state.solved-hinted { color: var(--green); }
.task-state.review { color: var(--red); }

.practice-task {
  display: grid;
  gap: 0;
  margin-top: 12px;
}

.practice-task-header,
.practice-section,
.practice-assistance,
.practice-solution,
.discussion-workspace {
  padding: 18px 2px;
  border-bottom: 1px solid var(--line);
}

.practice-task-header {
  padding-top: 8px;
}

.practice-task h1 {
  margin: 8px 0 10px;
  font-size: 1.55rem;
  line-height: 1.15;
}

.practice-task h2 {
  margin: 0 0 10px;
  font-size: 1rem;
  line-height: 1.3;
}

.practice-task p,
.practice-task li {
  line-height: 1.55;
}

.practice-task ul,
.practice-task ol {
  margin: 0;
  padding-left: 21px;
}

.practice-task li + li {
  margin-top: 7px;
}

.practice-summary {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.96rem;
}

.practice-example {
  min-width: 0;
  margin: 12px 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-strong);
}

.practice-example figcaption {
  padding: 9px 11px;
  border-bottom: 1px solid var(--line);
  font-size: 0.76rem;
  font-weight: 850;
}

.practice-example pre {
  max-width: 100%;
  margin: 0;
  overflow-x: auto;
  padding: 12px;
  background: #0f172a;
  color: #e2e8f0;
  font: 12px/1.55 ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.practice-example p {
  margin: 0;
  padding: 10px 12px;
  color: var(--muted);
  font-size: 0.82rem;
}

.start-practice {
  width: 100%;
  margin: 18px 0;
}

.practice-workspace {
  min-width: 0;
  margin: 18px 0 0;
}

.practice-assistance {
  display: grid;
  gap: 16px;
}

.practice-assistance > details > summary {
  cursor: pointer;
}

.practice-assistance details .btn {
  margin: 10px 6px 0 0;
}

.practice-actions {
  margin-top: 2px;
}

.discussion-workspace {
  display: grid;
  gap: 14px;
  margin-top: 10px;
}

.plan-checks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.plan-checks label {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  min-width: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  font-size: 0.8rem;
  font-weight: 750;
}

.plan-checks input {
  flex: 0 0 auto;
  margin-top: 2px;
}

.practice-solution {
  display: grid;
  gap: 14px;
  padding-top: 22px;
}

.practice-solution > h2 {
  font-size: 1.25rem;
}

.practice-solution .practice-section {
  padding: 14px 0;
}

.practice-solution .code-card {
  border-radius: 8px;
}

.solution-prose {
  display: grid;
  gap: 10px;
}

.solution-prose p {
  margin: 0;
  white-space: pre-wrap;
}

.complexity-list {
  display: grid;
  gap: 8px;
  margin: 0;
}

.complexity-list > div {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
}

.complexity-list dt {
  color: var(--muted);
  font-weight: 800;
}

.complexity-list dd {
  min-width: 0;
  margin: 0;
}

.legacy-task .runner-notice {
  border: 1px solid var(--line);
  border-radius: 6px;
}

.difficulty {
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  background: color-mix(in srgb, var(--yellow) 18%, transparent);
  color: color-mix(in srgb, var(--yellow) 72%, var(--ink));
  padding: 5px 9px;
  font-size: 0.78rem;
  font-weight: 900;
}

.empty {
  border: 1px dashed var(--line);
  border-radius: 20px;
  padding: 20px;
  color: var(--muted);
  text-align: center;
}

.tabs {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: var(--panel-strong);
}

.session-nav {
  position: sticky;
  bottom: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom));
  z-index: 8;
  display: grid;
  gap: 8px;
  margin: 4px 0 0;
  padding: 8px 0;
  border-radius: 8px;
  background: var(--panel-strong);
}

.question-card.has-bottom-explanation .session-nav {
  position: static;
}

.session-primary-actions,
.session-secondary-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.session-secondary-actions #editMockAnswer {
  grid-column: 1 / -1;
}

.mock-question-nav {
  display: grid;
  grid-template-columns: repeat(10, minmax(28px, 1fr));
  gap: 5px;
  margin-bottom: 14px;
}

.mock-number {
  min-width: 0;
  min-height: 32px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 800;
}

.mock-number.active { outline: 2px solid var(--blue); color: var(--ink); }
.mock-number.positive { border-color: var(--green); color: var(--green); }
.mock-number.partial { border-color: var(--yellow); color: var(--yellow); }
.mock-number.negative { border-color: var(--red); color: var(--red); }
.mock-number.skipped { border-style: dashed; }

.mock-note { margin-top: 16px; }

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(9, 14, 10, 0.62);
}

.modal-dialog {
  width: min(100%, 360px);
  padding: 20px;
  border-radius: 8px;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}

.modal-dialog h2 { margin-top: 0; }
.mock-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.topic-result {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 7px 12px;
  align-items: center;
  margin: 12px 0;
}

.topic-result .progress-track { grid-column: 1 / -1; }

.report-list {
  display: grid;
  gap: 10px;
  padding-left: 22px;
}

.report-list li { padding-left: 4px; }
.report-list span { display: block; margin-top: 3px; color: var(--muted); font-size: 0.82rem; }

.knowledge-search,
.knowledge-category,
.lesson-article,
.ide-brief,
.ide-workspace {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
}

.knowledge-search { padding: 14px; }

.knowledge-search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px;
  gap: 8px;
  align-items: end;
}

.icon-btn {
  width: 44px;
  min-width: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
  color: var(--ink);
  font-size: 1.25rem;
}

.icon-btn.active { color: var(--yellow); }

.filter-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 10px;
}

.filter-grid .field span { font-size: 0.7rem; }
.filter-grid select { min-width: 0; padding: 9px 6px; font-size: 0.78rem; }

.chip-row {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  margin-top: 10px;
  padding-bottom: 2px;
}

.chip {
  flex: 0 0 auto;
  min-height: 32px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--soft);
  color: var(--ink);
  font-size: 0.75rem;
}

.knowledge-strip,
.knowledge-results { margin-top: 20px; }

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.section-heading h2 { margin: 0 0 10px; font-size: 1.05rem; }

.horizontal-list {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(190px, 72%);
  gap: 8px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.knowledge-compact {
  display: grid;
  min-height: 82px;
  align-content: center;
  gap: 6px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  color: var(--ink);
  text-align: left;
  scroll-snap-align: start;
}

.knowledge-compact span { color: var(--muted); font-size: 0.72rem; }

.knowledge-category { margin-bottom: 10px; overflow: hidden; }

.knowledge-category > header {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 10px;
  align-items: center;
  padding: 14px;
  border-bottom: 1px solid var(--line);
}

.knowledge-category h3,
.knowledge-category p { margin: 0; }
.knowledge-category header p { color: var(--muted); font-size: 0.76rem; }

.category-glyph {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 6px;
  background: color-mix(in srgb, var(--green) 14%, var(--soft));
  color: var(--green);
  font-weight: 900;
}

.knowledge-category details > summary {
  display: flex;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  padding: 9px 14px;
  cursor: pointer;
}

.knowledge-subsection > p {
  padding: 8px 14px;
  background: color-mix(in srgb, var(--soft) 84%, transparent);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
}

.lesson-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 28px;
  width: 100%;
  gap: 8px;
  align-items: center;
  padding: 12px 14px;
  border: 0;
  border-top: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.lesson-row small { display: block; margin-top: 4px; color: var(--muted); line-height: 1.35; }
.lesson-status { color: var(--muted); font-size: 1.3rem; text-align: center; }
.lesson-status.done { color: var(--green); }

.breadcrumbs {
  display: flex;
  gap: 6px;
  align-items: center;
  overflow-x: auto;
  margin-top: 10px;
  color: var(--muted);
  white-space: nowrap;
}

.breadcrumbs button,
.back-link {
  min-height: 36px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--green);
  font-weight: 800;
}

.lesson-article { overflow: hidden; }
.lesson-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; padding: 18px; }
.lesson-header h2 { margin: 4px 0 0; font-size: 1.55rem; }

.lesson-definition {
  margin: 0;
  padding: 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--green) 8%, var(--soft));
  font-size: 1.05rem;
  font-weight: 750;
  line-height: 1.5;
}

.lesson-section { border-bottom: 1px solid var(--line); }
.lesson-section summary { padding: 14px 18px; cursor: pointer; }
.lesson-section > div { padding: 0 18px 18px; line-height: 1.58; }
.lesson-section li + li { margin-top: 7px; }
.lesson-note,
.lesson-actions,
.lesson-sources { display: grid; gap: 10px; padding: 18px; border-top: 1px solid var(--line); }
.lesson-sources a { color: var(--green); overflow-wrap: anywhere; }
.lesson-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }

.lesson-link {
  display: block;
  width: 100%;
  min-height: 40px;
  padding: 8px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--green);
  font-weight: 800;
  text-align: left;
}

.empty-state { padding: 28px 18px; color: var(--muted); text-align: center; }

.ide-filters { margin-top: 12px; }
.ide-catalog { display: grid; gap: 8px; margin-top: 12px; }

.ide-task-row {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  color: var(--ink);
  text-align: left;
}

.ide-task-row small { display: block; margin-top: 4px; color: var(--muted); line-height: 1.35; }
.language-badge { overflow: hidden; padding: 5px 6px; border-radius: 4px; background: var(--soft); color: var(--blue); font-size: 0.68rem; font-weight: 900; text-align: center; text-overflow: ellipsis; }
.language-badge.web { color: var(--green); }
.language-badge.typescript { color: var(--blue); }
.language-badge.react { color: var(--violet); }
.task-state { color: var(--muted); font-size: 0.7rem; }
.task-state.solved { color: var(--green); }
.task-state.review { color: var(--red); }

.ide-brief { padding: 14px 16px; line-height: 1.5; }
.ide-brief > p { margin-top: 0; font-weight: 700; }
.ide-workspace { overflow: hidden; }

.file-tabs {
  display: flex;
  overflow-x: auto;
  border-bottom: 1px solid #2d3748;
  background: #111827;
}

.file-tab {
  flex: 0 0 auto;
  min-height: 40px;
  padding: 0 12px;
  border: 0;
  border-right: 1px solid #2d3748;
  background: #111827;
  color: #94a3b8;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
}

.file-tab.active { background: #1f2937; color: #f8fafc; }

.editor-toolbar {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  padding: 5px;
  background: #1f2937;
}

.editor-toolbar button {
  flex: 0 0 36px;
  min-height: 34px;
  padding: 0 5px;
  border: 1px solid #374151;
  border-radius: 4px;
  background: #111827;
  color: #e5e7eb;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.toolbar-divider { flex: 0 0 1px; margin: 4px; background: #475569; }

.code-editor {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  height: 330px;
  overflow: hidden;
  background: #0f172a;
  color: #e2e8f0;
  font: 13px/1.55 ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.line-numbers {
  overflow: hidden;
  padding: 12px 8px;
  border-right: 1px solid #263244;
  color: #64748b;
  text-align: right;
  white-space: pre;
  user-select: none;
}

.code-input-wrap { position: relative; min-width: 0; overflow: hidden; }

.code-input-wrap pre,
.code-input-wrap textarea {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: auto;
  padding: 12px;
  border: 0;
  border-radius: 0;
  background: transparent;
  font: inherit;
  line-height: inherit;
  tab-size: 2;
  white-space: pre;
}

.code-input-wrap pre { pointer-events: none; }
.code-input-wrap textarea { resize: none; caret-color: #f8fafc; color: transparent; -webkit-text-fill-color: transparent; }
.code-input-wrap textarea::selection { background: rgba(59, 130, 246, 0.42); }
.token-keyword { color: #c084fc; }
.token-string { color: #86efac; }
.token-number { color: #fdba74; }
.token-comment { color: #64748b; }

.run-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: center;
  padding: 9px;
  border-top: 1px solid var(--line);
}

.run-bar .btn { min-height: 38px; padding: 8px 10px; }
.runner-status { margin-left: auto; color: var(--muted); font-size: 0.75rem; font-weight: 800; }
.runner-notice { padding: 10px 14px; border-top: 1px solid var(--line); background: color-mix(in srgb, var(--yellow) 12%, var(--soft)); font-size: 0.8rem; line-height: 1.45; }

.web-preview {
  display: block;
  width: 100%;
  height: 360px;
  border: 0;
  border-top: 1px solid var(--line);
  background: white;
}

.runner-output { border-top: 1px solid var(--line); background: #0b1120; color: #e2e8f0; }
.runner-output > header { display: flex; justify-content: space-between; padding: 10px 12px; border-bottom: 1px solid #263244; font-size: 0.78rem; }
.console-log { max-height: 170px; overflow: auto; font: 12px/1.5 ui-monospace, Consolas, monospace; }
.console-line { padding: 5px 12px; border-bottom: 1px solid #1e293b; white-space: pre-wrap; overflow-wrap: anywhere; }
.console-line.warn { color: #fde68a; }
.console-line.error { color: #fca5a5; }
.test-results { display: grid; }
.test-result { display: grid; gap: 3px; padding: 8px 12px; border-top: 1px solid #1e293b; font-size: 0.75rem; }
.test-result.passed { color: #86efac; }
.test-result.failed { color: #fca5a5; }
.test-result span { color: #cbd5e1; overflow-wrap: anywhere; }

.ide-solution-meta {
  display: grid;
  gap: 12px;
  padding: 14px;
  border-top: 1px solid var(--line);
}

.ide-solution-meta details .btn { margin: 8px 6px 0 0; }
.hint-text { margin: 7px 0; padding: 10px; background: color-mix(in srgb, var(--yellow) 10%, var(--soft)); }

.ide-workspace.fullscreen {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  grid-template-rows: auto auto minmax(220px, 1fr) auto auto;
  margin: 0;
  border: 0;
  border-radius: 0;
  background: var(--panel-strong);
}

.ide-workspace.fullscreen .code-editor { height: auto; min-height: 0; }
.ide-workspace.fullscreen .runner-output { max-height: 32vh; overflow: auto; }

.code-card figcaption span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.code-card .copy-code {
  flex: 0 0 auto;
  max-width: 112px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.code-card,
pre,
code,
.console-log,
.runner-output,
.code-editor,
.code-input-wrap {
  max-width: 100%;
}

.code-card,
pre {
  overflow-x: auto;
  overscroll-behavior-x: contain;
}

.tab {
  display: grid;
  min-height: 58px;
  place-items: center;
  border: 0;
  border-radius: 18px;
  background: transparent;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 900;
}

.tab .icon {
  display: block;
  font-size: 1.1rem;
}

.tab.active {
  background: color-mix(in srgb, var(--green) 16%, transparent);
  color: var(--green);
}

.update-toast {
  position: fixed;
  right: max(12px, env(safe-area-inset-right));
  bottom: calc(var(--bottom-nav-height) + 14px + env(safe-area-inset-bottom));
  left: max(12px, env(safe-area-inset-left));
  z-index: 60;
  display: grid;
  gap: 10px;
  width: min(406px, calc(100% - 24px));
  margin: 0 auto;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}

.update-toast div {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

@media (min-width: 700px) {
  .app-shell {
    padding: 18px 0;
  }

  .screen {
    min-height: calc(100vh - 36px);
    border: 1px solid var(--line);
    border-radius: 34px;
    background: color-mix(in srgb, var(--bg) 60%, transparent);
    box-shadow: var(--shadow);
  }
}

@media (max-width: 699px) {
  .app-shell {
    margin-left: 0;
    margin-right: 0;
  }

  .tabs {
    right: auto;
  }
}

@media (max-width: 380px) {
  .hero-title {
    font-size: 2rem;
  }

  .stats-row,
  .practice-grid,
  .two-col {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}