:root {
  --bg-top: #fff5d6;
  --bg-bottom: #f4f0e8;
  --panel: rgba(255, 252, 244, 0.92);
  --panel-strong: #fffdf8;
  --text: #1b2a2f;
  --muted: #5d6f75;
  --accent: #0f7b6c;
  --accent-dark: #0a5f53;
  --accent-soft: rgba(15, 123, 108, 0.14);
  --warn-soft: #fff1b8;
  --border: rgba(27, 42, 47, 0.1);
  --shadow: 0 24px 70px rgba(53, 40, 10, 0.14);
  --success: #1f8f5f;
  --success-soft: #dff6ea;
  --error: #ba3f2d;
  --error-soft: #fde5df;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Avenir Next", "Trebuchet MS", "Gill Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 220, 122, 0.8), transparent 35%),
    radial-gradient(circle at top right, rgba(15, 123, 108, 0.18), transparent 28%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.16) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 90%);
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero {
  max-width: 760px;
  margin-bottom: 28px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent-dark);
  font-weight: 700;
}

h1,
h2,
h3 {
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  margin: 0;
}

h1 {
  font-size: clamp(2.75rem, 5vw, 4.6rem);
  line-height: 0.95;
  margin-bottom: 14px;
}

.hero-copy,
.guide-copy,
.finish-summary,
.setup-message,
.feedback-text,
.progress-copy,
summary,
textarea,
button,
label,
select,
input,
a {
  font-size: 1rem;
  line-height: 1.55;
}

.hero-copy {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
}

.main-panel {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 28px;
  backdrop-filter: blur(16px);
}

.view {
  animation: rise-in 260ms ease;
}

.setup-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(290px, 0.9fr);
  gap: 24px;
}

.setup-grid-single {
  grid-template-columns: 1fr;
}

.guide-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.editor-panel,
.guide-card,
.study-card,
.finish-card,
.progress-panel {
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 24px;
}

.editor-panel,
.guide-card,
.finish-card {
  padding: 24px;
}

.section-heading {
  margin-bottom: 16px;
}

.section-heading-inline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.builder-heading-row {
  align-items: center;
}

.builder-heading-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-heading-subtle {
  margin-top: 20px;
  margin-bottom: 12px;
}

.section-heading-subtle h3 {
  font-size: 1.05rem;
}

.section-heading h2 {
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.home-dashboard {
  display: grid;
  gap: 18px;
}

.home-actions-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.home-action-button {
  min-height: 136px;
  aspect-ratio: 1 / 1;
  border-radius: 24px;
  border: 1px solid rgba(27, 42, 47, 0.1);
  background: #fffdfa;
  box-shadow: 0 14px 28px rgba(27, 42, 47, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  text-align: center;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  font-size: clamp(1.22rem, 2.2vw, 1.45rem);
  line-height: 1.15;
  transition:
    transform 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease,
    background-color 140ms ease;
}

.home-action-button:hover {
  transform: translateY(-2px);
  border-color: rgba(15, 123, 108, 0.24);
  box-shadow: 0 18px 34px rgba(27, 42, 47, 0.1);
}

.home-action-button:focus-visible {
  outline: 3px solid rgba(15, 123, 108, 0.2);
  outline-offset: 2px;
}

.launcher-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.launch-card {
  appearance: none;
  width: 100%;
  border: 1px solid rgba(27, 42, 47, 0.1);
  border-radius: 22px;
  background: #fffdfa;
  color: var(--text);
  text-decoration: none;
  padding: 18px;
  min-height: 132px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 10px;
  text-align: left;
  cursor: pointer;
  box-shadow: 0 14px 28px rgba(27, 42, 47, 0.06);
  transition:
    transform 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease,
    background-color 140ms ease;
}

.launch-card:hover {
  transform: translateY(-2px);
  border-color: rgba(15, 123, 108, 0.24);
  box-shadow: 0 18px 34px rgba(27, 42, 47, 0.1);
}

.launch-card:focus-visible {
  outline: 3px solid rgba(15, 123, 108, 0.2);
  outline-offset: 2px;
}

.launch-card-title {
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.25;
}

.launch-card-copy {
  color: var(--muted);
}

.deck-status-card,
.deck-input-panel {
  background: #fbf8f0;
  border: 1px solid rgba(27, 42, 47, 0.08);
  border-radius: 22px;
  padding: 18px;
}

.deck-status-card {
  margin-bottom: 18px;
}

.deck-status-card h3 {
  font-size: clamp(1.25rem, 2.6vw, 1.65rem);
  margin-bottom: 8px;
}

.deck-status-card .section-kicker {
  margin-bottom: 8px;
}

.deck-input-panel {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
}

.panel-inline-heading {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
}

.panel-inline-heading h3 {
  font-size: 1.25rem;
}

textarea {
  width: 100%;
  min-height: 420px;
  resize: vertical;
  border-radius: 18px;
  border: 1px solid rgba(27, 42, 47, 0.12);
  padding: 18px;
  background: #fffdfa;
  color: var(--text);
  font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
}

textarea:focus {
  outline: 3px solid rgba(15, 123, 108, 0.18);
  border-color: rgba(15, 123, 108, 0.34);
}

.save-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.set-name-input {
  flex: 1 1 260px;
  min-width: 0;
  border-radius: 999px;
  border: 1px solid rgba(27, 42, 47, 0.12);
  padding: 12px 16px;
  background: #fffdfa;
  color: var(--text);
  font-size: 1rem;
}

.set-name-input:focus {
  outline: 3px solid rgba(15, 123, 108, 0.18);
  border-color: rgba(15, 123, 108, 0.34);
}

.tool-menu {
  margin-top: 18px;
  padding-top: 0;
  border-top: none;
  border: 1px solid rgba(27, 42, 47, 0.08);
  border-radius: 22px;
  background: #fbf8f0;
  overflow: hidden;
}

.tool-menu summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
}

.tool-menu summary::-webkit-details-marker {
  display: none;
}

.tool-menu summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--accent-dark);
}

.tool-menu[open] summary::after {
  content: "-";
}

.tool-menu-panel {
  display: grid;
  gap: 12px;
  padding: 0 18px 18px;
  border-top: 1px solid rgba(27, 42, 47, 0.08);
}

.menu-label,
.toggle-label {
  font-weight: 700;
}

.menu-label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

.menu-select {
  width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(27, 42, 47, 0.12);
  background: #fffdfa;
  color: var(--text);
  padding: 12px 14px;
}

.menu-select:focus {
  outline: 3px solid rgba(15, 123, 108, 0.18);
  border-color: rgba(15, 123, 108, 0.34);
}

.menu-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.menu-note {
  margin: 0;
  color: var(--muted);
}

.builder-page {
  display: grid;
  gap: 20px;
}

.builder-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.95fr);
  gap: 24px;
}

.builder-grid-single {
  grid-template-columns: 1fr;
}

.builder-header-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
}

.builder-name-field {
  flex: 1 1 260px;
  min-width: 0;
}

.builder-top-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  flex: 1 1 360px;
}

.builder-form {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.builder-textarea {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  border-radius: 18px;
  border: 1px solid rgba(27, 42, 47, 0.12);
  padding: 14px 16px;
  background: #fffdfa;
  color: var(--text);
  font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
}

.builder-textarea:focus {
  outline: 3px solid rgba(15, 123, 108, 0.18);
  border-color: rgba(15, 123, 108, 0.34);
}

.builder-count-note {
  margin: 12px 0 0;
}

.builder-entry-topline {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.builder-inline-guide {
  margin-top: 18px;
}

.recent-panel {
  padding: 18px 20px;
}

.recent-sets-list {
  display: grid;
  gap: 10px;
}

.recent-set-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 18px;
  background: #f8f4ea;
  border: 1px solid rgba(27, 42, 47, 0.08);
}

.recent-set-copy {
  min-width: 0;
  flex: 1 1 220px;
}

.recent-set-title {
  margin: 0 0 4px;
  font-size: 1rem;
  line-height: 1.2;
}

.recent-set-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.recent-empty {
  margin: 0;
  color: var(--muted);
}

.setup-actions,
.finish-actions,
.feedback-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.setup-actions {
  margin-top: 16px;
}

.button {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 140ms ease,
    box-shadow 140ms ease,
    background-color 140ms ease,
    color 140ms ease;
  text-align: center;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.button:focus-visible {
  outline: 3px solid rgba(15, 123, 108, 0.2);
  outline-offset: 2px;
}

.button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.button-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 14px 28px rgba(15, 123, 108, 0.22);
}

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

.button-secondary {
  background: rgba(27, 42, 47, 0.08);
  color: var(--text);
}

.button-ghost {
  background: transparent;
  color: var(--accent-dark);
  border: 1px solid rgba(15, 123, 108, 0.2);
}

.upload-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.button-compact {
  padding: 10px 14px;
  font-size: 0.94rem;
}

.setup-message {
  min-height: 1.6em;
  margin: 12px 0 0;
  color: var(--muted);
}

.setup-message.error {
  color: var(--error);
}

.guide-panel pre {
  margin: 18px 0;
  padding: 16px;
  border-radius: 18px;
  background: #f7f4eb;
  overflow-x: auto;
  border: 1px solid rgba(27, 42, 47, 0.08);
}

.guide-panel code {
  font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  font-size: 0.95rem;
}

.guide-steps {
  margin: 0 0 18px;
  padding-left: 22px;
  display: grid;
  gap: 8px;
}

.upload-strip {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.upload-strip-emphasis {
  margin-top: 18px;
  padding: 16px;
  border-radius: 20px;
  background: rgba(15, 123, 108, 0.08);
  border: 1px solid rgba(15, 123, 108, 0.14);
}

.upload-wide-button {
  width: 100%;
  min-height: 54px;
  font-size: 1.02rem;
}

.upload-strip-note {
  margin: 0;
  color: var(--muted);
}

.saved-sets-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.saved-sets-empty,
.saved-set-meta {
  margin: 0;
  color: var(--muted);
}

.saved-set-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px;
  border-radius: 18px;
  background: #f8f4ea;
  border: 1px solid rgba(27, 42, 47, 0.08);
}

.saved-set-copy {
  min-width: 0;
  flex: 1 1 220px;
}

.saved-set-title {
  margin: 0 0 4px;
  font-size: 1.1rem;
  line-height: 1.2;
}

.saved-set-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.saved-set-actions .button {
  padding-inline: 14px;
}

.icon-button {
  width: 46px;
  height: 46px;
  padding: 0;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-dark);
}

.icon-button svg {
  width: 19px;
  height: 19px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-button-danger {
  color: var(--error);
  border-color: rgba(186, 63, 45, 0.2);
}

.storage-panel {
  gap: 14px;
}

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

.faq-item {
  padding: 14px 16px;
  border-radius: 18px;
  background: #fffdfa;
  border: 1px solid rgba(27, 42, 47, 0.08);
}

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}

.faq-item p {
  margin: 0;
}

details {
  border-top: 1px solid rgba(27, 42, 47, 0.08);
  padding-top: 14px;
}

summary {
  cursor: pointer;
  font-weight: 700;
}

.progress-panel {
  padding: 18px 20px;
  margin-bottom: 18px;
}

.progress-copy {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

.progress-track {
  width: 100%;
  height: 14px;
  border-radius: 999px;
  background: rgba(27, 42, 47, 0.08);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, #13a989, #f0ae33);
  transition: width 220ms ease;
}

.progress-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 14px;
}

.session-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.session-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.timer-panel {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(27, 42, 47, 0.06);
  border: 1px solid rgba(27, 42, 47, 0.1);
}

.timer-panel.is-warning {
  background: rgba(240, 174, 51, 0.16);
  border-color: rgba(240, 174, 51, 0.3);
}

.timer-label {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.timer-value {
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.toggle-field {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
}

.toggle-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.toggle-help {
  color: var(--muted);
  font-size: 0.92rem;
  text-align: right;
}

.toggle-switch {
  position: relative;
  width: 54px;
  height: 32px;
  flex: 0 0 auto;
}

.toggle-switch input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: rgba(27, 42, 47, 0.18);
  transition: background-color 180ms ease;
}

.toggle-slider::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 6px 14px rgba(27, 42, 47, 0.18);
  transition: transform 180ms ease;
}

.toggle-switch input:focus-visible + .toggle-slider {
  outline: 3px solid rgba(15, 123, 108, 0.2);
  outline-offset: 2px;
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--accent);
}

.toggle-switch input:checked + .toggle-slider::after {
  transform: translateX(22px);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(27, 42, 47, 0.36);
  backdrop-filter: blur(10px);
}

.modal-card {
  width: min(520px, 100%);
  padding: 26px;
  border-radius: 24px;
  background: var(--panel-strong);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow);
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.study-card {
  padding: 28px;
}

.card-topline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.back-button {
  appearance: none;
  border: 1px solid rgba(27, 42, 47, 0.12);
  background: rgba(27, 42, 47, 0.05);
  color: rgba(27, 42, 47, 0.68);
  border-radius: 999px;
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  cursor: pointer;
  transition:
    background-color 140ms ease,
    border-color 140ms ease,
    color 140ms ease,
    transform 140ms ease;
}

.back-button:hover:not(:disabled) {
  background: rgba(27, 42, 47, 0.09);
  border-color: rgba(27, 42, 47, 0.18);
  color: var(--text);
  transform: translateY(-1px);
}

.back-button:focus-visible {
  outline: 3px solid rgba(15, 123, 108, 0.18);
  outline-offset: 2px;
}

.back-button:disabled {
  opacity: 0.45;
  cursor: default;
  transform: none;
}

.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(15, 123, 108, 0.12);
  color: var(--accent-dark);
  font-weight: 700;
  font-size: 0.9rem;
}

.pill-warn {
  background: var(--warn-soft);
  color: #7b5200;
}

.concept-label {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-weight: 700;
  font-size: 0.94rem;
  letter-spacing: 0.04em;
}

.definition-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
}

.definition-text {
  font-size: clamp(1.8rem, 3.8vw, 3rem);
  line-height: 1.1;
  margin-bottom: 24px;
}

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

.option-button {
  border: 1px solid rgba(27, 42, 47, 0.1);
  border-radius: 22px;
  background: #fffdfa;
  color: var(--text);
  padding: 18px;
  text-align: left;
  min-height: 94px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 120ms ease,
    border-color 120ms ease,
    box-shadow 120ms ease,
    background-color 120ms ease;
}

.option-button:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: rgba(15, 123, 108, 0.28);
  box-shadow: 0 14px 28px rgba(27, 42, 47, 0.08);
}

.option-button:disabled {
  cursor: default;
}

.option-button.correct {
  background: var(--success-soft);
  border-color: rgba(31, 143, 95, 0.28);
  color: #14583b;
}

.option-button.incorrect {
  background: var(--error-soft);
  border-color: rgba(186, 63, 45, 0.28);
  color: #842b20;
}

.feedback-row {
  justify-content: space-between;
  margin-top: 18px;
}

.feedback-text {
  margin: 0;
  color: var(--muted);
  flex: 1 1 340px;
}

.feedback-text.success {
  color: var(--success);
}

.feedback-text.error {
  color: var(--error);
}

.finish-card {
  text-align: center;
}

.finish-card h2 {
  font-size: clamp(2rem, 5vw, 3.3rem);
  margin-bottom: 10px;
}

.finish-summary {
  max-width: 560px;
  margin: 0 auto 22px;
  color: var(--muted);
}

.finish-actions {
  justify-content: center;
}

.history-card {
  margin-top: 18px;
  padding: 24px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 24px;
}

.history-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.history-summary,
.history-empty,
.history-note {
  margin: 0;
  color: var(--muted);
}

.history-summary {
  max-width: 420px;
  text-align: right;
}

.history-chart {
  margin: 14px 0 10px;
}

.history-line-wrapper {
  width: 100%;
  overflow-x: auto;
  padding-bottom: 4px;
}

.history-line-svg {
  display: block;
  width: 100%;
  min-width: 360px;
  height: auto;
}

.history-grid-line {
  stroke: rgba(27, 42, 47, 0.1);
  stroke-dasharray: 4 6;
}

.history-axis-line {
  stroke: rgba(27, 42, 47, 0.18);
  stroke-width: 1.3;
}

.history-axis-label {
  fill: var(--muted);
  font-size: 10px;
}

.history-axis-label-bottom {
  font-size: 9.5px;
}

.history-axis-label-session {
  font-size: 9px;
  letter-spacing: 0.08em;
}

.history-line-path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.35;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.history-point {
  fill: #fffdfa;
  stroke: #f0ae33;
  stroke-width: 2.35;
}

.history-point-value {
  fill: var(--accent-dark);
  font-size: 10.5px;
  font-weight: 700;
}

.history-bar-item {
  display: grid;
  gap: 8px;
  justify-items: center;
}

.history-bar-value {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.history-bar-track {
  width: min(48px, 100%);
  height: 160px;
  border-radius: 18px;
  background: #f4efe1;
  border: 1px solid rgba(27, 42, 47, 0.08);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.history-bar-fill {
  width: 100%;
  min-height: 8%;
  border-radius: 16px;
  background: linear-gradient(180deg, #f0ae33, #13a989);
  transition: height 220ms ease;
}

.history-bar-label {
  font-size: 0.82rem;
  color: var(--muted);
}

.library-page {
  display: grid;
  gap: 16px;
}

.library-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
}

.library-toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

.library-list {
  gap: 14px;
}

.library-empty {
  background: #fffdf8;
  border: 1px solid rgba(27, 42, 47, 0.08);
  border-radius: 24px;
  padding: 24px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 920px) {
  .setup-grid {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 18px, 1000px);
    padding: 18px 0 28px;
  }

  .main-panel,
  .study-card,
  .editor-panel,
  .guide-card,
  .finish-card,
  .history-card {
    padding: 20px;
  }

  textarea {
    min-height: 320px;
  }

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

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

  .save-row {
    flex-direction: column;
  }

  .progress-copy,
  .feedback-row,
  .history-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .progress-controls {
    align-items: flex-start;
    justify-content: flex-start;
    flex-direction: column;
  }

  .toggle-copy {
    align-items: flex-start;
  }

  .toggle-help {
    text-align: left;
  }

  .history-summary {
    text-align: left;
  }

  .saved-set-item {
    align-items: flex-start;
  }

  .recent-set-card {
    align-items: flex-start;
  }

  .saved-set-actions {
    width: 100%;
  }

  .recent-set-actions {
    width: 100%;
  }

  .icon-button {
    width: 44px;
    height: 44px;
  }

  .menu-actions,
  .library-toolbar-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .builder-header-row,
  .builder-top-actions {
    align-items: stretch;
  }

  .builder-top-actions,
  .builder-heading-tools,
  .session-actions,
  .modal-actions {
    width: 100%;
  }

  .builder-entry-topline {
    gap: 6px;
  }

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

  .option-button {
    min-height: 76px;
  }
}