@font-face {
  font-family: "OpenDyslexic";
  src: url("https://cdn.jsdelivr.net/npm/open-dyslexic@1.0.3/woff/OpenDyslexic-Regular.woff") format("woff");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "OpenDyslexic";
  src: url("https://cdn.jsdelivr.net/npm/open-dyslexic@1.0.3/woff/OpenDyslexic-Bold.woff") format("woff");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;
  --bg: #f3f7f2;
  --surface: #fffdf7;
  --surface-2: #e8f1ee;
  --text: #25313d;
  --muted: #5f6f78;
  --line: #cdded6;
  --primary: #2f5f6b;
  --primary-2: #7a5b24;
  --accent: #f2a65a;
  --warn: #cf6b49;
  --good: #2f7f5f;
  --sky: #dbeafe;
  --mint: #dcfce7;
  --sun: #fff1b8;
  --lavender: #ece7ff;
  --shadow: 0 12px 28px rgba(37, 49, 61, 0.1);
  --radius: 8px;
  --font: "OpenDyslexic", "Comic Sans MS", "Trebuchet MS", Arial, sans-serif;
}

[data-theme="pearl"] {
  --bg: #eef2f4;
  --surface: #ffffff;
  --surface-2: #dfe7ec;
  --text: #1f2b33;
  --muted: #65727a;
  --line: #cbd6dc;
  --primary: #315c72;
  --primary-2: #457b9d;
  --accent: #2f8f83;
}

[data-theme="night"] {
  color-scheme: dark;
  --bg: #121719;
  --surface: #1d2428;
  --surface-2: #283238;
  --text: #f4f7f6;
  --muted: #b9c4c8;
  --line: #39464d;
  --primary: #86b6f6;
  --primary-2: #c8a2c8;
  --accent: #7bdcb5;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.32);
}

[data-theme="contrast"] {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f3f3f3;
  --text: #000000;
  --muted: #1f1f1f;
  --line: #000000;
  --primary: #000000;
  --primary-2: #003cff;
  --accent: #008000;
  --warn: #b00000;
  --shadow: none;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg) 0%, color-mix(in srgb, var(--bg), var(--sky) 28%) 100%);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0;
}

button,
input,
select,
textarea {
  font: inherit;
}

body,
button,
input,
select,
textarea,
dialog {
  font-family: var(--font);
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent), white 20%);
  outline-offset: 2px;
}

.liam-greeting {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
  padding: 10px clamp(14px, 3vw, 32px);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--sun), var(--surface) 56%);
  color: var(--text);
}

.liam-greeting p {
  margin: 0;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 900;
  line-height: 1.35;
  text-align: center;
}

.greeting-speak {
  display: inline-flex;
  min-height: 36px;
  gap: 7px;
  align-items: center;
  justify-content: center;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: white;
  background: var(--primary);
  font-weight: 900;
  white-space: nowrap;
}

.greeting-speak span:first-child {
  display: grid;
  width: 20px;
  height: 20px;
  place-items: center;
  border-radius: 50%;
  color: var(--primary);
  background: white;
  font-size: 0.82rem;
  line-height: 1;
}

.shell-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto auto auto;
  gap: 16px;
  align-items: center;
  padding: 14px clamp(14px, 3vw, 32px);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface), transparent 8%);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  min-width: max-content;
  padding: 0;
  color: var(--text);
  background: transparent;
  border: 0;
  text-align: left;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: white;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 0.82rem;
}

.tabs {
  display: flex;
  justify-content: center;
  gap: 6px;
  min-width: 0;
  overflow-x: auto;
}

.tab,
.text-button {
  border: 0;
  background: transparent;
  color: var(--muted);
}

.tab {
  min-height: 40px;
  padding: 8px 12px;
  border-radius: var(--radius);
  white-space: nowrap;
}

.tab:hover,
.tab.is-active {
  color: var(--text);
  background: var(--surface-2);
}

.theme-picker {
  display: flex;
  gap: 8px;
}

.theme-dot {
  width: 26px;
  height: 26px;
  border: 2px solid var(--line);
  border-radius: 50%;
  background: var(--surface-2);
}

.theme-dot.is-active {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary), transparent 80%);
}

.theme-dot.cream { background: #f7f3ea; }
.theme-dot.pearl { background: #eef2f4; }
.theme-dot.night { background: #1d2428; }
.theme-dot.contrast { background: linear-gradient(90deg, #fff 50%, #000 50%); }

.voice-toggle,
.calm-toggle {
  display: inline-flex;
  min-height: 40px;
  gap: 8px;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface-2);
  font-weight: 800;
  white-space: nowrap;
}

.voice-toggle span:first-child,
.calm-toggle span:first-child {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--muted);
}

.voice-toggle.is-active,
.calm-toggle.is-active {
  color: white;
  background: var(--accent);
  border-color: var(--accent);
}

.voice-toggle.is-active span:first-child,
.calm-toggle.is-active span:first-child {
  color: var(--accent);
  background: white;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
  gap: clamp(18px, 4vw, 36px);
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: clamp(16px, 4vw, 40px);
}

.side-panel {
  position: sticky;
  top: 92px;
  align-self: start;
  display: grid;
  gap: 16px;
}

.timer-panel,
.quick-panel,
.comfort-panel,
.result-panel,
.exercise-card,
.dialog-card,
.form-grid,
.workspace,
.course-player,
.path-list li,
.homework-card,
.stats-grid article,
.session-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.timer-panel,
.quick-panel,
.comfort-panel,
.result-panel,
.exercise-card,
.dialog-card,
.form-grid,
.workspace,
.course-player {
  padding: clamp(16px, 2.4vw, 24px);
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--primary-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.14;
}

h1 {
  max-width: 16ch;
  font-size: clamp(2rem, 4vw, 3.7rem);
}

h2 {
  font-size: clamp(1.25rem, 2vw, 1.65rem);
}

.lead {
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.12rem;
}

.page {
  display: none;
  min-width: 0;
}

.page.is-active {
  display: grid;
  gap: 24px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: clamp(24px, 5vw, 56px);
  align-items: center;
  min-height: min(520px, calc(100vh - 150px));
  padding-bottom: 8px;
}

.hero-visual {
  position: relative;
  min-height: 360px;
  border-radius: var(--radius);
  background:
    linear-gradient(150deg, var(--mint) 0 36%, var(--sky) 36% 68%, var(--sun) 68% 100%);
  border: 1px solid var(--line);
  overflow: hidden;
}

.paper {
  position: absolute;
  inset: 42px 34px auto;
  display: grid;
  gap: 14px;
  padding: 28px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  color: #24313f;
  box-shadow: 0 16px 28px rgba(37, 49, 61, 0.14);
}

.paper span {
  display: block;
  padding: 12px 14px;
  border-left: 6px solid var(--good);
  background: #f5fbf9;
  font-weight: 800;
}

.floating-card {
  position: absolute;
  right: 22px;
  bottom: 62px;
  padding: 12px 16px;
  border-radius: var(--radius);
  background: #fff3cd;
  color: #443b16;
  font-weight: 800;
}

.floating-card.second {
  right: auto;
  bottom: 18px;
  left: 28px;
  background: #d9f7ec;
  color: #123f35;
}

.actions,
.timer-controls,
.option-row,
.comfort-actions,
.player-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.actions.end {
  justify-content: flex-end;
}

.primary-button,
.secondary-button,
.icon-button {
  min-height: 42px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 800;
}

.primary-button {
  padding: 10px 16px;
  color: white;
  background: var(--primary);
}

.secondary-button {
  padding: 10px 16px;
  color: var(--text);
  background: var(--surface-2);
  border-color: var(--line);
}

.icon-button {
  display: inline-grid;
  width: 42px;
  place-items: center;
  color: var(--text);
  background: var(--surface-2);
  border-color: var(--line);
}

.full {
  width: 100%;
}

.support-text {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.calm-list {
  display: grid;
  gap: 8px;
  margin: 14px 0;
  padding: 0;
  list-style: none;
}

.calm-list li {
  padding: 8px 10px;
  border-left: 5px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent), transparent 86%);
  font-weight: 800;
}

.comfort-actions {
  margin-top: 12px;
}

.text-button {
  min-height: 40px;
  padding: 6px 0;
  color: var(--primary);
  font-weight: 800;
}

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

.section-heading.compact {
  align-items: center;
}

.content-section {
  display: grid;
  gap: 16px;
}

.starter-path {
  display: grid;
  gap: 16px;
}

.path-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.path-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: center;
  min-height: 92px;
  padding: 16px;
}

.path-list strong {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--primary);
}

.homework-grid,
.homework-list,
.result-layout,
.stats-grid {
  display: grid;
  gap: 16px;
}

.homework-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.result-layout,
.stats-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.homework-list {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.homework-card {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.homework-card p {
  margin: 0;
  color: var(--muted);
}

.homework-transformed {
  padding: 10px 12px;
  border-left: 5px solid var(--good);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--good), transparent 90%);
}

.homework-transformed strong {
  color: var(--text);
}

.homework-kind {
  display: block;
  color: var(--primary-2);
  font-size: 0.92rem;
  line-height: 1.35;
}

.homework-cue {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.homework-cue span {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding: 5px 9px;
  border-radius: var(--radius);
  background: var(--lavender);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 800;
}

.card-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.subject-pill {
  display: inline-flex;
  width: fit-content;
  margin: 0;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--primary);
  background: color-mix(in srgb, var(--primary), transparent 88%);
  font-size: 0.86rem;
  font-weight: 800;
}

.form-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 260px);
  gap: 16px;
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-weight: 800;
}

.wide {
  grid-column: 1 / -1;
}

.choice-bar {
  margin: 0;
  padding: 0;
  border: 0;
}

.choice-bar[hidden] {
  display: none;
}

.choice-bar legend {
  margin-bottom: 7px;
  color: var(--text);
  font-weight: 800;
}

.segmented-control {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

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

.segmented-control label {
  position: relative;
  display: block;
  min-width: 0;
  cursor: pointer;
}

.segmented-control input {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.segmented-control span {
  display: grid;
  min-height: 44px;
  place-items: center;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-weight: 800;
  line-height: 1.25;
  text-align: center;
}

.segmented-control input:checked + span {
  color: white;
  background: var(--primary);
  border-color: var(--primary);
}

.segmented-control input:focus-visible + span {
  outline: 3px solid color-mix(in srgb, var(--accent), white 20%);
  outline-offset: 2px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--text);
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 11px 12px;
  color: var(--text);
  background: var(--surface);
}

textarea {
  resize: vertical;
}

.check {
  display: inline-flex;
  grid-template-columns: auto 1fr;
  gap: 8px;
  align-items: center;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
  font-weight: 700;
}

.check input {
  width: auto;
}

.adapted-text {
  min-height: 100px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
  font-size: 1.08rem;
  line-height: 1.85;
  white-space: pre-line;
}

.steps {
  display: grid;
  gap: 10px;
  padding-left: 24px;
}

.steps li {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.steps.interactive {
  padding-left: 0;
  list-style: none;
}

.steps.interactive li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
}

.steps.interactive input {
  width: 24px;
  height: 24px;
  margin-top: 3px;
  accent-color: var(--good);
}

.tool-choice {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--primary);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), var(--sky) 30%);
}

.tool-choice-buttons,
.tool-extra {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tool-choice-button {
  min-height: 48px;
  min-width: 120px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface);
  font-weight: 900;
}

.tool-choice-button:hover,
.tool-choice-button.is-active {
  color: white;
  background: var(--primary);
  border-color: var(--primary);
}

.tool-extra[hidden],
.stylus-panel[hidden],
.exercise-card label[hidden] {
  display: none;
}

.stylus-panel {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), var(--sun) 22%);
}

.stylus-actions,
.samsung-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.stylus-times-table[hidden] {
  display: none;
}

.stylus-times-table .operation-times-table {
  margin: 0;
}

.stylus-canvas {
  display: block;
  width: 100%;
  height: 260px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(var(--surface-2) 1px, transparent 1px) 0 0 / 100% 52px,
    var(--surface);
  touch-action: none;
}

.samsung-panel {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--good);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), var(--mint) 24%);
}

.feedback {
  padding: 14px;
  border-left: 5px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent), transparent 88%);
  font-weight: 800;
}

.liam-operation-prompt {
  min-height: auto;
  font-size: 1.35rem;
  font-weight: 900;
  text-align: center;
}

.operation-coach[hidden],
.geometry-paper-coach[hidden] {
  display: none;
}

.operation-coach,
.geometry-paper-coach {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--good);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), var(--mint) 22%);
}

.geometry-paper-coach {
  border-left-color: var(--primary);
  background: color-mix(in srgb, var(--surface), var(--sky) 22%);
}

.operation-coach-top,
.geometry-coach-top {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.operation-coach-top h2,
.geometry-coach-top h2,
.operation-step-card h3 {
  margin: 0;
}

.geometry-coach-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.85fr) minmax(240px, 1.15fr);
  gap: 14px;
  align-items: stretch;
}

.geometry-paper-plan {
  display: grid;
  gap: 12px;
  align-content: start;
}

.geometry-paper-rule {
  margin: 0;
  padding: 12px 14px;
  border-left: 5px solid var(--primary);
  border-radius: var(--radius);
  background: var(--surface);
  font-weight: 900;
}

.geometry-tool-row,
.geometry-clue-row,
.geometry-check-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.geometry-tool-row span,
.geometry-clue-row span,
.geometry-check-row span {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-weight: 900;
  text-align: center;
}

.geometry-tool-row span {
  background: color-mix(in srgb, var(--sun), var(--surface) 42%);
}

.geometry-clue-row span {
  background: color-mix(in srgb, var(--lavender), var(--surface) 34%);
}

.geometry-check-row span {
  background: color-mix(in srgb, var(--mint), var(--surface) 34%);
}

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

.geometry-paper-steps li {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.geometry-paper-steps input {
  width: 24px;
  height: 24px;
  accent-color: var(--good);
}

.geometry-paper-steps label {
  display: grid;
  min-width: 0;
  gap: 3px;
  font-weight: 800;
}

.geometry-paper-steps label span {
  color: var(--muted);
  font-weight: 800;
  line-height: 1.45;
}

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

.operation-mode-button {
  min-height: 56px;
  padding: 10px 12px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface);
  font-size: 1.02rem;
  font-weight: 900;
}

.operation-mode-button.is-active {
  color: white;
  background: var(--primary);
  border-color: var(--primary);
}

.operation-progress {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  font-weight: 900;
}

.operation-progress div {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface);
}

.operation-progress i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--good);
}

.operation-coach-grid {
  display: grid;
  grid-template-columns: minmax(180px, 0.8fr) minmax(240px, 1.2fr);
  gap: 14px;
  align-items: stretch;
}

.operation-layout-card,
.operation-step-card {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.operation-step-card h3 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.12;
  text-align: center;
}

.operation-labels {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
}

.operation-layout {
  width: fit-content;
  max-width: 100%;
  margin: 0;
  padding: 12px 16px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--text);
  font-family: "OpenDyslexic", "Courier New", monospace;
  font-size: 1.25rem;
  line-height: 1.35;
  letter-spacing: 0;
  white-space: pre;
}

.colored-operation-layout {
  display: inline-grid;
  gap: 4px;
  white-space: normal;
}

.operation-layout-line {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1.35em;
  align-items: center;
  justify-content: end;
  min-height: 1.5em;
}

.operation-space,
.operation-symbol,
.operation-separator,
.operation-digit {
  display: grid;
  min-width: 1.2em;
  min-height: 1.2em;
  place-items: center;
  border-radius: 6px;
  line-height: 1;
}

.operation-symbol {
  color: var(--primary-2);
  font-weight: 900;
}

.operation-separator {
  color: var(--muted);
}

.operation-digit {
  border: 2px solid transparent;
  color: #1f2933;
  font-weight: 900;
}

.operation-digit.is-units,
.operation-place-legend .is-units {
  background: #d8f1ff;
  border-color: #4ea9d8;
}

.operation-digit.is-tens,
.operation-place-legend .is-tens {
  background: #dff6df;
  border-color: #58b06a;
}

.operation-digit.is-hundreds,
.operation-place-legend .is-hundreds {
  background: #ffe6c7;
  border-color: #d88a2d;
}

.operation-digit.is-thousands,
.operation-place-legend .is-thousands {
  background: #eadcff;
  border-color: #8a6bd8;
}

.operation-digit.is-ten-thousands,
.operation-digit.is-more {
  background: #f7dce7;
  border-color: #cf6f91;
}

.fraction-operation-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
  white-space: normal;
}

.fraction-term {
  display: inline-grid;
  min-width: 3.4em;
  gap: 4px;
  justify-items: center;
  align-items: center;
}

.fraction-cell,
.fraction-whole,
.fraction-mystery {
  display: grid;
  min-width: 2.4em;
  min-height: 2em;
  place-items: center;
  border: 2px solid transparent;
  border-radius: 7px;
  color: #1f2933;
  font-weight: 900;
}

.fraction-bar {
  width: 100%;
  height: 3px;
  border-radius: 99px;
  background: var(--text);
}

.fraction-cell.is-numerator,
.fraction-place-legend .is-numerator {
  background: #d8f1ff;
  border-color: #4ea9d8;
}

.fraction-cell.is-denominator,
.fraction-place-legend .is-denominator {
  background: #ffe6c7;
  border-color: #d88a2d;
}

.fraction-whole,
.fraction-mystery {
  background: #dff6df;
  border-color: #58b06a;
}

.fraction-operator {
  min-width: 1.3em;
  text-align: center;
}

.operation-place-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(82px, 1fr));
  gap: 6px;
}

.operation-place-legend span {
  display: grid;
  min-height: 34px;
  place-items: center;
  padding: 4px 6px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  color: #1f2933;
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1;
}

.operation-step-count {
  margin: 0;
  color: var(--primary-2);
  font-weight: 900;
}

.operation-answer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 10px;
}

.operation-answer-grid input {
  min-height: 48px;
  font-size: 1.08rem;
  font-weight: 900;
}

.operation-choice-button {
  min-height: 76px;
  padding: 10px;
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface-2);
  font-size: clamp(1.5rem, 5vw, 2.6rem);
  font-weight: 900;
  line-height: 1;
}

.operation-choice-button:hover,
.operation-choice-button:focus-visible {
  color: white;
  background: var(--primary);
}

.operation-feedback {
  margin: 0;
  padding: 12px;
  border-radius: var(--radius);
  font-weight: 900;
  line-height: 1.5;
}

.operation-feedback.is-success {
  color: var(--text);
  background: color-mix(in srgb, var(--good), transparent 82%);
}

.operation-feedback.is-error {
  color: var(--text);
  background: color-mix(in srgb, #b13b3b, transparent 86%);
}

.operation-times-table {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.operation-times-table strong {
  color: var(--primary-2);
}

.operation-times-table div {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(66px, 1fr));
  gap: 8px;
}

.operation-times-table span {
  display: grid;
  min-height: 54px;
  place-items: center;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.operation-times-table small {
  color: var(--muted);
  font-weight: 800;
}

.operation-times-table b {
  font-size: 1.18rem;
}

.dictation-prompt {
  white-space: normal;
}

.dictation-exercise {
  display: grid;
  gap: 18px;
}

.dictation-trap-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(78px, 1fr));
  gap: 7px;
}

.dictation-trap-legend span,
.orth-trap {
  display: inline-grid;
  place-items: center;
  border: 2px solid transparent;
  border-radius: 7px;
  color: #1f2933;
  font-weight: 900;
}

.dictation-trap-legend span {
  min-height: 34px;
  padding: 4px 7px;
  font-size: 0.78rem;
  line-height: 1;
}

.orth-trap {
  min-width: 1.05em;
  margin: 0 1px;
  padding: 1px 3px;
  line-height: 1.15;
}

.trap-accent {
  background: #ffe1ef;
  border-color: #d86a9a;
}

.trap-sound {
  background: #d8f1ff;
  border-color: #4ea9d8;
}

.trap-double {
  background: #ffe6c7;
  border-color: #d88a2d;
}

.trap-ending {
  background: #dff6df;
  border-color: #58b06a;
}

.trap-silent {
  background: #eadcff;
  border-color: #8a6bd8;
}

.dictation-word-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 10px;
}

.dictation-word {
  display: grid;
  min-height: 62px;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.dictation-word small {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--primary);
  font-weight: 900;
}

.dictation-word strong {
  font-size: 1.12rem;
  line-height: 1.25;
  overflow-wrap: break-word;
  word-break: normal;
  hyphens: none;
}

.dictation-qcm {
  display: grid;
  gap: 14px;
}

.dictation-question {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), var(--sky) 18%);
}

.dictation-question.is-correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good), transparent 90%);
}

.dictation-question.is-wrong {
  border-color: #b13b3b;
  background: color-mix(in srgb, #b13b3b, transparent 90%);
}

.dictation-question-top {
  color: var(--primary-2);
  font-weight: 900;
}

.dictation-choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

.dictation-choice {
  min-height: 56px;
  padding: 10px 12px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface);
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1.25;
  overflow-wrap: break-word;
  word-break: normal;
  hyphens: none;
}

.dictation-choice:hover,
.dictation-choice.is-selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary), transparent 82%);
}

.dictation-choice.is-correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good), transparent 82%);
}

.dictation-choice.is-wrong {
  border-color: #b13b3b;
  background: color-mix(in srgb, #b13b3b, transparent 84%);
}

.dictation-correction {
  min-height: 1.5em;
  margin: 0;
  color: var(--text);
  font-weight: 800;
  line-height: 1.55;
}

.conjugation-prompt {
  white-space: normal;
}

.conjugation-exercise {
  display: grid;
  gap: 18px;
}

.conjugation-rappel,
.conjugation-verb,
.conjugation-question {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.conjugation-rappel {
  border-left: 6px solid var(--good);
  background: color-mix(in srgb, var(--surface), var(--mint) 24%);
}

.conjugation-rappel p,
.conjugation-rappel ol,
.conjugation-question p {
  margin: 0;
}

.conjugation-rappel ol {
  padding-left: 24px;
}

.conjugation-qcm {
  display: grid;
  gap: 14px;
}

.conjugation-verb {
  background: color-mix(in srgb, var(--surface), var(--sky) 14%);
}

.conjugation-question {
  background: var(--surface);
}

.conjugation-question.is-correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good), transparent 90%);
}

.conjugation-question.is-wrong {
  border-color: #b13b3b;
  background: color-mix(in srgb, #b13b3b, transparent 90%);
}

.conjugation-question-top {
  display: grid;
  gap: 6px;
}

.conjugation-question-top span {
  color: var(--primary-2);
  font-weight: 900;
}

.conjugation-question-top strong {
  font-size: 1.25rem;
}

.conjugation-choice-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.conjugation-choice {
  display: grid;
  min-height: 64px;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface);
  font-size: 1.08rem;
  font-weight: 900;
}

.conjugation-choice span {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--primary);
}

.conjugation-choice:hover,
.conjugation-choice.is-selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary), transparent 82%);
}

.conjugation-choice.is-correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good), transparent 82%);
}

.conjugation-choice.is-wrong {
  border-color: #b13b3b;
  background: color-mix(in srgb, #b13b3b, transparent 84%);
}

.conjugation-correction {
  min-height: 1.5em;
  margin: 0;
  color: var(--text);
  font-weight: 800;
  line-height: 1.55;
}

.help-button.is-active {
  color: white;
  background: var(--primary-2);
  border-color: var(--primary-2);
}

.help-panel {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), var(--sun) 28%);
}

.help-panel[hidden] {
  display: none;
}

.help-heading {
  display: grid;
  gap: 4px;
}

.help-intro {
  margin: 0;
  color: var(--muted);
  font-weight: 800;
}

.help-steps {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 24px;
}

.help-steps li {
  padding: 8px 10px;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), transparent 12%);
}

.grammar-prompt {
  white-space: normal;
}

.grammar-prompt-layout,
.grammar-coach {
  display: grid;
  gap: 14px;
}

.grammar-task-box {
  display: grid;
  gap: 5px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--primary);
  border-radius: var(--radius);
  background: var(--surface);
}

.grammar-task-box span {
  color: var(--muted);
  font-weight: 800;
}

.grammar-coach {
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--good);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), var(--mint) 24%);
}

.grammar-coach[hidden] {
  display: none;
}

.grammar-coach-top {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.grammar-coach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.grammar-map-card {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.grammar-question-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 8px;
}

.grammar-question-map span {
  display: grid;
  min-height: 66px;
  gap: 2px;
  place-items: center;
  padding: 8px 10px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  text-align: center;
}

.grammar-question-map small {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 900;
}

.grammar-coach-steps {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.grammar-coach-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.grammar-coach-steps input {
  width: 24px;
  height: 24px;
  margin-top: 3px;
  accent-color: var(--good);
}

.block-help-visual,
.multiplication-help-visual,
.geometry-help-visual,
.word-help-visual,
.formula-help-visual,
.grammar-help-visual,
.conjugation-help-visual,
.conjugation-rappel-visual,
.memo-help-visual,
.timeline-help-visual,
.science-help-visual,
.generic-help-visual {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.block-help-visual {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.multiplication-help-visual {
  display: grid;
  gap: 12px;
}

.multiplication-expression {
  width: fit-content;
  padding: 8px 12px;
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--primary), transparent 88%);
  color: var(--text);
  font-size: 1.25rem;
}

.posed-multiplication-help {
  align-items: start;
}

.posed-multiplication {
  width: fit-content;
  max-width: 100%;
  margin: 0;
  padding: 12px 16px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--text);
  font-family: "OpenDyslexic", "Courier New", monospace;
  font-size: 1.2rem;
  line-height: 1.35;
  letter-spacing: 0;
  white-space: pre;
}

.multiplication-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: flex-start;
}

.multiplication-group {
  display: grid;
  gap: 6px;
  min-width: 96px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.multiplication-group span {
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 900;
}

.block-pile {
  display: grid;
  gap: 8px;
  min-width: 104px;
}

.block-label {
  color: var(--text);
  font-weight: 900;
  line-height: 1.2;
}

.block-grid {
  display: grid;
  grid-template-columns: repeat(4, 22px);
  grid-auto-rows: 22px;
  gap: 3px;
  align-items: end;
}

.math-block,
.block-more {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border: 2px solid rgba(0, 0, 0, 0.22);
  box-shadow: inset -4px -4px 0 rgba(0, 0, 0, 0.16), inset 3px 3px 0 rgba(255, 255, 255, 0.25);
}

.block-pile.is-grass .math-block {
  background: #5a9f43;
}

.block-pile.is-water .math-block {
  background: #4c8fc9;
}

.block-pile.is-sun .math-block,
.block-pile.is-answer .math-block {
  background: #d5a336;
}

.block-more {
  color: var(--text);
  background: var(--surface-2);
  font-weight: 900;
}

.help-symbol {
  color: var(--primary);
  font-size: 1.8rem;
  font-weight: 900;
}

.geometry-help-visual {
  display: grid;
  gap: 12px;
}

.geometry-paper-preview {
  position: relative;
  min-height: 260px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(var(--surface-2) 1px, transparent 1px) 0 0 / 100% 42px,
    linear-gradient(90deg, var(--surface-2) 1px, transparent 1px) 0 0 / 42px 100%,
    var(--surface);
}

.geometry-paper-preview span {
  position: absolute;
  display: block;
}

.paper-point {
  display: grid !important;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 2px solid var(--primary);
  border-radius: 50%;
  background: var(--surface);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 900;
  line-height: 1;
  z-index: 4;
}

.point-a { left: 20%; bottom: 24%; }
.point-b { right: 20%; bottom: 24%; }
.point-c { left: 50%; top: 18%; transform: translateX(-50%); }
.point-d { left: 20%; top: 22%; }
.point-o { left: 50%; top: 50%; transform: translate(-50%, -50%); }
.point-a2 { right: 24%; top: 30%; }

.paper-line {
  height: 5px;
  border-radius: 999px;
  background: var(--primary);
  transform-origin: left center;
}

.line-base {
  left: calc(20% + 14px);
  right: calc(20% + 14px);
  bottom: calc(24% + 13px);
}

.line-left {
  left: calc(20% + 16px);
  bottom: calc(24% + 14px);
  width: 37%;
  transform: rotate(-38deg);
}

.line-right {
  right: calc(20% + 16px);
  bottom: calc(24% + 14px);
  width: 37%;
  transform: rotate(218deg);
  transform-origin: right center;
}

.paper-rectangle {
  left: 21%;
  top: 27%;
  width: 58%;
  height: 48%;
  border: 5px solid var(--primary);
  border-radius: 4px;
}

.paper-angle-mark {
  left: 24%;
  bottom: 28%;
  width: 28px;
  height: 28px;
  border-right: 5px solid var(--accent);
  border-top: 5px solid var(--accent);
}

.paper-circle {
  left: 22%;
  top: 14%;
  width: 56%;
  aspect-ratio: 1;
  border: 5px solid var(--primary);
  border-radius: 50%;
}

.radius-line {
  left: 50%;
  top: 50%;
  width: 26%;
  transform: rotate(-18deg);
}

.paper-label {
  min-height: 32px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--sun), var(--surface) 36%);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 900;
}

.radius-label { right: 14%; top: 37%; }
.mirror-label { left: 50%; bottom: 12%; transform: translateX(-50%); }
.parallel-label { right: 12%; top: 43%; }
.angle-label { left: 54%; top: 45%; }

.paper-axis {
  left: 50%;
  top: 10%;
  bottom: 10%;
  width: 5px;
  border-radius: 999px;
  background: repeating-linear-gradient(180deg, var(--warn) 0 12px, transparent 12px 22px);
}

.paper-dash {
  top: 40%;
  width: 22%;
  height: 3px;
  border-top: 4px dashed var(--accent);
}

.paper-dash.left { left: 27%; }
.paper-dash.right { right: 27%; }

.parallel-one,
.parallel-two {
  left: 18%;
  width: 64%;
  transform: rotate(-12deg);
}

.parallel-one { top: 36%; }
.parallel-two { top: 62%; }

.angle-one,
.angle-two {
  left: 50%;
  top: 50%;
  width: 36%;
}

.angle-one { transform: rotate(0deg); }
.angle-two { transform: rotate(-48deg); }

.paper-arc {
  left: 52%;
  top: 36%;
  width: 72px;
  height: 72px;
  border-top: 5px solid var(--accent);
  border-left: 5px solid var(--accent);
  border-radius: 50%;
}

.paper-guide-grid {
  inset: 18%;
  border: 3px dashed var(--accent);
  border-radius: var(--radius);
}

.block-shape {
  display: grid;
  width: fit-content;
  grid-template-columns: repeat(4, 34px);
  grid-auto-rows: 34px;
  gap: 4px;
}

.block-shape span {
  background: #d7e6ec;
  border: 2px solid #8ca7b4;
  box-shadow: inset -5px -5px 0 rgba(49, 92, 114, 0.18), inset 4px 4px 0 rgba(255, 255, 255, 0.4);
}

.block-shape .edge {
  background: #80b27c;
  border-color: #4f7b49;
}

.block-shape .corner {
  background: #d5a336;
  border-color: #946f1d;
}

.geometry-labels,
.word-help-visual,
.formula-help-visual,
.help-focus-line,
.conjugation-train,
.conjugation-person-map,
.grammar-sentence-strip,
.grammar-role-strip,
.memo-help-visual,
.timeline-help-visual,
.science-help-visual,
.generic-help-visual {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.geometry-labels span,
.word-help-visual span,
.formula-help-visual span,
.help-focus-line span,
.conjugation-train-step,
.person-pair,
.grammar-token,
.role-card,
.memo-help-visual span,
.timeline-help-visual span,
.science-help-visual span,
.generic-help-visual span {
  display: grid;
  min-height: 44px;
  place-items: center;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--text);
  font-weight: 900;
  text-align: center;
}

.word-help-visual span,
.memo-help-visual span {
  align-content: center;
  min-width: 96px;
  gap: 2px;
}

.word-help-visual small,
.memo-help-visual small {
  color: var(--muted);
  font-size: 0.76rem;
}

.formula-help-visual strong {
  color: var(--primary);
  font-size: 1.4rem;
}

.grammar-help-visual,
.conjugation-help-visual,
.conjugation-rappel-visual {
  display: grid;
  gap: 12px;
}

.help-focus-line span {
  min-width: 132px;
  border-width: 2px;
}

.conjugation-equation {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 12px;
  border-radius: var(--radius);
  background: var(--surface-2);
}

.conjugation-equation span,
.conjugation-equation strong,
.conjugation-train-arrow {
  display: grid;
  min-height: 42px;
  place-items: center;
  font-weight: 900;
}

.conjugation-equation span {
  min-width: 116px;
  padding: 8px 12px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  text-align: center;
}

.conjugation-equation strong,
.conjugation-train-arrow {
  color: var(--primary);
  font-size: 1.35rem;
}

.conjugation-train-step,
.person-pair,
.grammar-token,
.role-card {
  border-width: 2px;
}

.person-pair {
  align-content: center;
  min-width: 108px;
  gap: 2px;
}

.person-pair small,
.grammar-token small,
.role-card small {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.2;
}

.grammar-sentence-strip {
  align-items: stretch;
}

.grammar-token {
  align-content: center;
  min-width: 98px;
  gap: 2px;
}

.role-card {
  min-width: 132px;
  line-height: 1.25;
}

.is-subject {
  background: #dbeafe;
  border-color: #4d8fd6;
  color: #1f2933;
}

.is-helper,
.is-verb {
  background: #dcfce7;
  border-color: #49a66a;
  color: #1f2933;
}

.is-determiner {
  background: #fff1b8;
  border-color: #d8a431;
  color: #1f2933;
}

.is-noun {
  background: #ece7ff;
  border-color: #8d79d6;
  color: #1f2933;
}

.is-adjective {
  background: #ffe2cf;
  border-color: #cf7a45;
  color: #1f2933;
}

.is-word {
  background: var(--surface-2);
  border-color: var(--line);
}

.help-micro-cue {
  margin: 0;
  padding: 10px 12px;
  border-left: 5px solid var(--primary);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--primary), transparent 90%);
  color: var(--text);
  font-weight: 900;
}

.timer-ring {
  display: grid;
  width: 132px;
  height: 132px;
  place-items: center;
  margin: 10px auto;
  border-radius: 50%;
  background:
    conic-gradient(var(--accent) var(--progress, 100%), var(--surface-2) 0),
    var(--surface-2);
  color: var(--text);
  font-size: 1.35rem;
  font-weight: 900;
}

.timer-ring span {
  display: grid;
  width: 96px;
  height: 96px;
  place-items: center;
  border-radius: 50%;
  background: var(--surface);
}

body.is-calm {
  background: var(--bg);
}

body.is-calm .app-shell {
  width: min(1160px, 100%);
}

body.is-calm .hero {
  grid-template-columns: 1fr;
  min-height: auto;
  padding-block: 18px 8px;
}

body.is-calm .hero-visual {
  display: none;
}

body.is-calm .homework-grid {
  grid-template-columns: 1fr;
}

body.is-calm .tab:not(.is-active),
body.is-calm .theme-picker {
  opacity: 0.82;
}

body.is-calm .toast {
  box-shadow: none;
}

.keyboard-layout {
  display: grid;
  gap: 14px;
}

.keyboard-game {
  display: grid;
  gap: 16px;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent), transparent 86%), transparent),
    var(--surface);
  box-shadow: var(--shadow);
}

.game-top,
.lesson-tabs,
.game-board,
.game-score {
  display: flex;
  gap: 10px;
}

.game-top {
  justify-content: space-between;
  align-items: center;
}

.game-score {
  min-width: 96px;
  min-height: 62px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.game-score strong {
  color: var(--primary);
  font-size: 1.8rem;
  line-height: 1;
}

.game-score span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.lesson-tabs {
  flex-wrap: wrap;
}

.lesson-tab {
  min-height: 38px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface);
  font-weight: 800;
}

.lesson-tab.is-active {
  color: white;
  background: var(--primary);
  border-color: var(--primary);
}

.game-board {
  min-height: 150px;
  flex-direction: column;
  justify-content: center;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), white 32%);
}

.game-instruction,
.game-feedback {
  margin: 0;
}

.game-instruction {
  color: var(--primary-2);
  font-weight: 800;
}

.game-target {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.game-char {
  display: inline-grid;
  min-width: 48px;
  min-height: 52px;
  place-items: center;
  padding: 8px 10px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 1.35rem;
  font-weight: 900;
}

.game-char.done {
  color: white;
  background: var(--good);
  border-color: var(--good);
}

.game-char.current {
  color: white;
  background: var(--warn);
  border-color: var(--warn);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--warn), transparent 76%);
}

.game-char.next {
  color: var(--muted);
}

.game-feedback {
  min-height: 32px;
  padding: 10px 12px;
  border-left: 5px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent), transparent 88%);
  font-weight: 800;
}

.writing-output {
  min-height: 130px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  font-size: 1.25rem;
}

.prediction-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.prediction-row button,
.key {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface);
  font-weight: 800;
}

.prediction-row button {
  padding: 8px 12px;
}

.keyboard {
  display: grid;
  gap: 8px;
}

.key-row {
  display: grid;
  grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
  gap: 8px;
}

.key {
  min-height: 48px;
  padding: 8px;
}

.key.is-target {
  color: white;
  background: var(--warn);
  border-color: var(--warn);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--warn), transparent 72%);
  transform: translateY(-2px);
}

.key.is-muted {
  opacity: 0.62;
}

.key.space {
  grid-column: span 5;
}

.key.action {
  background: var(--surface-2);
}

.slide {
  position: relative;
  min-height: 320px;
  display: grid;
  gap: 18px;
  overflow: hidden;
  padding: clamp(22px, 4vw, 42px);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--primary), transparent 86%), transparent),
    var(--surface-2);
}

.slide h2 {
  font-size: clamp(1.6rem, 3vw, 2.5rem);
}

.course-progress {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface);
}

.course-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--good), var(--accent));
}

.course-video-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(18px, 4vw, 34px);
  align-items: center;
}

.course-script {
  display: grid;
  gap: 14px;
  min-width: 0;
}

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

.course-bullets li {
  padding: 12px 14px;
  border-left: 6px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface);
  font-weight: 900;
  line-height: 1.45;
}

.course-visual {
  position: relative;
  min-height: 260px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, #dff3ff 0 58%, #dff6df 58% 100%);
  overflow: hidden;
}

.course-visual span {
  position: absolute;
  display: block;
}

.visual-sun {
  top: 28px;
  left: 32px;
  width: 76px;
  height: 76px;
  border: 6px solid #f59e0b;
  border-radius: 50%;
  background: #ffd166;
  box-shadow: 0 0 0 12px rgba(245, 158, 11, 0.15);
}

.visual-water {
  right: 10%;
  bottom: 28px;
  left: 8%;
  height: 62px;
  border: 3px solid #2077b4;
  border-radius: 45% 45% 12px 12px;
  background:
    repeating-linear-gradient(165deg, rgba(255,255,255,0.7) 0 10px, transparent 10px 24px),
    #58b7e8;
}

.visual-heat,
.visual-vapor {
  width: 18px;
  height: 78px;
  border-left: 5px solid #2f72d6;
  border-radius: 50%;
}

.visual-heat.one,
.visual-vapor.one { left: 36%; bottom: 100px; }
.visual-heat.two,
.visual-vapor.two { left: 48%; bottom: 120px; }
.visual-heat.three,
.visual-vapor.three { left: 60%; bottom: 104px; }

.visual-vapor {
  border-color: #5b8ec7;
  opacity: 0.85;
}

.visual-cloud {
  top: 54px;
  right: 16%;
  width: 118px;
  height: 54px;
  border: 3px solid #5b8ec7;
  border-radius: 999px;
  background: #ffffff;
  box-shadow:
    -28px 14px 0 -6px #ffffff,
    24px 11px 0 -4px #ffffff,
    0 -18px 0 -8px #ffffff;
}

.visual-cloud.big {
  top: 42px;
  right: 24%;
  width: 148px;
  height: 66px;
}

.visual-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #78b3e8;
}

.visual-dot.one { top: 136px; left: 36%; }
.visual-dot.two { top: 162px; left: 50%; background: #78d4a4; }
.visual-dot.three { top: 126px; left: 62%; background: #f4b860; }

.visual-rain {
  top: 118px;
  width: 8px;
  height: 58px;
  border-radius: 999px;
  background: #2276c7;
  transform: rotate(8deg);
}

.visual-rain.one { left: 40%; }
.visual-rain.two { left: 52%; }
.visual-rain.three { left: 64%; }

.visual-ground {
  right: 0;
  bottom: 0;
  left: 0;
  height: 58px;
  background: #71b768;
}

.visual-hill {
  right: 10%;
  bottom: 46px;
  width: 150px;
  height: 112px;
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  background: #8ba4ad;
}

.visual-river {
  right: 8%;
  bottom: 0;
  left: 12%;
  height: 74px;
  border-radius: 70% 40% 0 0;
  background: #45a8df;
  transform: skewX(-18deg);
}

.visual-arrow {
  right: 42%;
  bottom: 82px;
  width: 70px;
  height: 28px;
  border-right: 8px solid #1d64c8;
  border-bottom: 8px solid #1d64c8;
  transform: rotate(36deg);
}

.visual-stem {
  bottom: 48px;
  left: 50%;
  width: 10px;
  height: 126px;
  border-radius: 999px;
  background: #367a3b;
}

.visual-leaf {
  width: 72px;
  height: 42px;
  border-radius: 70% 12px 70% 12px;
  background: #54b96b;
}

.visual-leaf.left {
  bottom: 116px;
  left: calc(50% - 70px);
  transform: rotate(-26deg);
}

.visual-leaf.right {
  bottom: 88px;
  left: calc(50% + 8px);
  transform: rotate(28deg);
}

.visual-bolt {
  top: 38px;
  left: 44%;
  width: 78px;
  height: 150px;
  clip-path: polygon(45% 0, 90% 0, 58% 42%, 100% 42%, 28% 100%, 45% 55%, 0 55%);
  background: #f2a65a;
}

.visual-ring {
  border: 6px solid rgba(47, 95, 107, 0.35);
  border-radius: 50%;
}

.visual-ring.one {
  top: 44px;
  left: 28%;
  width: 132px;
  height: 132px;
}

.visual-ring.two {
  top: 20px;
  left: 20%;
  width: 184px;
  height: 184px;
}

.visual-lens {
  top: 54px;
  left: 28%;
  width: 116px;
  height: 116px;
  border: 12px solid #315c72;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
}

.visual-lens::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -32px;
  width: 78px;
  height: 14px;
  border-radius: 999px;
  background: #315c72;
  transform: rotate(42deg);
}

.visual-line {
  right: 12%;
  width: 86px;
  height: 12px;
  border-radius: 999px;
  background: #f2a65a;
}

.visual-line.one { top: 72px; }
.visual-line.two { top: 112px; background: #2f7f5f; }

.visual-card {
  display: grid !important;
  width: 110px;
  height: 76px;
  place-items: center;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-weight: 900;
}

.visual-card.one { top: 42px; left: 12%; }
.visual-card.two { top: 94px; left: 38%; background: #fff1b8; }
.visual-card.three { top: 146px; left: 22%; background: #dcfce7; }

.secondary-button.is-active {
  color: white;
  background: var(--primary);
  border-color: var(--primary);
}

.course-quiz {
  display: grid;
  gap: 14px;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--line);
  border-left: 6px solid var(--good);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), var(--mint) 22%);
}

.course-quiz[hidden] {
  display: none;
}

.course-question {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 900;
  line-height: 1.45;
}

.course-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 10px;
}

.course-option {
  min-height: 68px;
  padding: 12px 14px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface);
  font-weight: 900;
  line-height: 1.3;
  text-align: left;
}

.course-option:hover,
.course-option.is-selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary), transparent 82%);
}

.course-option.is-correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good), transparent 82%);
}

.course-option.is-wrong {
  border-color: #b13b3b;
  background: color-mix(in srgb, #b13b3b, transparent 86%);
}

.course-feedback {
  min-height: 1.5em;
  margin: 0;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--surface);
  font-weight: 900;
}

.smart-sections,
.course-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.smart-section,
.course-item {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

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

.smart-item {
  display: grid;
  gap: 3px;
  min-height: 58px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--surface-2);
  text-align: left;
}

.smart-item span,
.smart-item small {
  overflow-wrap: anywhere;
}

.smart-item small,
.course-item p {
  color: var(--muted);
  font-weight: 800;
}

.course-item {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}

.course-item h3,
.course-item p {
  margin: 6px 0 0;
}

.stats-grid article {
  padding: 18px;
}

.stats-grid strong {
  display: block;
  font-size: 2.4rem;
  line-height: 1;
}

.stats-grid span {
  color: var(--muted);
  font-weight: 800;
}

.session-list {
  display: grid;
  gap: 12px;
}

.session-item {
  padding: 14px 16px;
}

.scan-dialog {
  width: min(680px, calc(100vw - 24px));
  border: 0;
  padding: 0;
  background: transparent;
}

.scan-dialog::backdrop {
  background: rgba(0, 0, 0, 0.45);
}

.dialog-card {
  color: var(--text);
}

.scan-file-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.scan-file-actions .secondary-button {
  align-self: end;
  min-height: 45px;
}

.scan-status {
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--muted);
}

.scan-analysis {
  display: grid;
  gap: 8px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent), transparent 90%);
}

.scan-analysis p,
.scan-analysis ul {
  margin: 0;
}

.scan-analysis ul,
.scan-analysis ol {
  padding-left: 20px;
}

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

.draft-item {
  display: grid;
  gap: 3px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface), transparent 10%);
}

.draft-item span,
.draft-item small {
  color: var(--muted);
  font-weight: 800;
}

.toast-region {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 50;
  display: grid;
  gap: 10px;
}

.toast {
  max-width: min(360px, calc(100vw - 32px));
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  font-weight: 800;
}

.empty-state {
  padding: 18px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: color-mix(in srgb, var(--surface), transparent 32%);
}

.word-vowel-a { color: #9b2226; }
.word-vowel-e { color: #006d77; }
.word-vowel-i { color: #6d597a; }
.word-vowel-o { color: #bc6c25; }
.word-vowel-u { color: #2a9d8f; }

@media (max-width: 980px) {
  .shell-header {
    grid-template-columns: 1fr;
  }

  .tabs {
    justify-content: start;
  }

  .theme-picker {
    justify-content: start;
  }

  .app-shell {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .path-list {
    grid-template-columns: 1fr;
  }

  .operation-coach-grid {
    grid-template-columns: 1fr;
  }

  .geometry-coach-grid {
    grid-template-columns: 1fr;
  }

  .course-video-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: 16ch;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 14px;
  }

  .hero-visual {
    min-height: 280px;
  }

  .paper {
    inset: 24px 18px auto;
    padding: 18px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .segmented-control {
    grid-template-columns: 1fr;
  }

  .scan-file-actions {
    grid-template-columns: 1fr;
  }

  .course-item {
    grid-template-columns: 1fr;
  }

  .course-visual {
    min-height: 220px;
  }

  .course-options {
    grid-template-columns: 1fr;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .operation-coach-top {
    align-items: stretch;
    flex-direction: column;
  }

  .geometry-coach-top {
    align-items: stretch;
    flex-direction: column;
  }

  .geometry-paper-preview {
    min-height: 220px;
  }

  .geometry-paper-steps li {
    grid-template-columns: auto 1fr;
  }

  .geometry-paper-steps .icon-button {
    grid-column: 2;
    width: 100%;
  }

  .operation-answer-grid {
    grid-template-columns: 1fr;
  }

  .operation-mode-row {
    grid-template-columns: 1fr;
  }

  .conjugation-choice-grid {
    grid-template-columns: 1fr;
  }

  .key-row {
    gap: 5px;
  }

  .key {
    min-height: 42px;
    padding: 6px 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .key.is-target {
    transform: none;
  }
}