:root {
  --bg: #f6f1e8;
  --panel: #fffaf2;
  --ink: #1f1f1a;
  --muted: #6a675f;
  --accent: #1f5fb8;
  --accent-strong: #164489;
  --ok: #1d7f4e;
  --bad: #a32323;
  --edge: #d4cab7;
  --card: #ffffff;
  --shadow: rgba(47, 31, 4, 0.08);
  --mode-btn-bg: #ede3d3;
  --focus-outline: #92b9ea;
  --ok-soft-bg: rgba(29, 127, 78, 0.18);
  --ok-soft-border: rgba(29, 127, 78, 0.45);
  --bad-soft-bg: rgba(163, 35, 35, 0.15);
  --bad-soft-border: rgba(163, 35, 35, 0.45);
  --banner-bad-bg: #ffe8e8;
  --banner-bad-border: #efb6b6;
  --banner-ok-bg: #e8f5ff;
  --banner-ok-border: #b8d9ef;
  --remove-bg: #fff4f4;
  --remove-border: #dca6a6;
  --suggest-hover: #e7f0ff;
  --table-outline: #8f98a5;
  --table-grid: #aab2bd;
}

:root[data-theme="dark"],
body[data-theme="dark"] {
  --bg: #171a1d;
  --panel: #22272b;
  --ink: #e7e8ea;
  --muted: #b9bec4;
  --accent: #4f8fe8;
  --accent-strong: #8fb7f0;
  --ok: #35bd76;
  --bad: #ff6d6d;
  --edge: #394047;
  --card: #2b3136;
  --shadow: rgba(0, 0, 0, 0.3);
  --mode-btn-bg: #32393f;
  --focus-outline: #89b2ee;
  --ok-soft-bg: rgba(53, 189, 118, 0.2);
  --ok-soft-border: rgba(53, 189, 118, 0.5);
  --bad-soft-bg: rgba(255, 109, 109, 0.2);
  --bad-soft-border: rgba(255, 109, 109, 0.5);
  --banner-bad-bg: rgba(255, 109, 109, 0.16);
  --banner-bad-border: rgba(255, 109, 109, 0.35);
  --banner-ok-bg: rgba(53, 189, 118, 0.16);
  --banner-ok-border: rgba(53, 189, 118, 0.35);
  --remove-bg: rgba(255, 109, 109, 0.15);
  --remove-border: rgba(255, 109, 109, 0.45);
  --suggest-hover: rgba(79, 143, 232, 0.22);
  --table-outline: #a8b9cf;
  --table-grid: #8ea3bc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, rgba(96, 155, 235, 0.2) 0, transparent 40%),
    radial-gradient(circle at 85% 12%, rgba(43, 108, 196, 0.18) 0, transparent 38%),
    var(--bg);
  background-repeat: no-repeat;
  min-height: 100dvh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", sans-serif;
  transition: background 180ms ease, color 180ms ease;
}

.shell {
  max-width: 920px;
  margin: 10px auto;
  padding: 0 14px 10px;
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.1rem);
  letter-spacing: 0.01em;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent-strong);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 0.77rem;
}

.subtitle {
  margin: 8px 0 0;
  color: var(--muted);
}

.top-nav {
  margin-top: 10px;
  display: flex;
  gap: 8px;
}

.top-nav-link {
  text-decoration: none;
  color: var(--muted);
  border: 1px solid var(--edge);
  border-radius: 999px;
  padding: 6px 12px;
  font-weight: 700;
  background: color-mix(in srgb, var(--panel) 70%, var(--mode-btn-bg) 30%);
}

.top-nav-link.active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.top-nav-link:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--edge) 60%);
}

.theme-toggle {
  border: 1px solid var(--edge);
  border-radius: 999px;
  padding: 6px 12px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-weight: 700;
}

.panel {
  margin-top: 10px;
  background: var(--panel);
  border: 1px solid color-mix(in srgb, var(--edge) 78%, #000 22%);
  border-radius: 14px;
  padding: 10px;
  box-shadow: 0 10px 24px var(--shadow);
}

.controls {
  display: grid;
  gap: 10px;
}

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

.mode-picker.segmented {
  position: relative;
  gap: 0;
  padding: 4px;
  border: 1px solid var(--edge);
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel) 82%, var(--mode-btn-bg) 18%);
  overflow: hidden;
}

.mode-picker.segmented::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: calc(50% - 4px);
  height: calc(100% - 8px);
  border-radius: 9px;
  background: var(--accent);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.14);
  transform: translateX(0);
  transition: transform 210ms ease;
  z-index: 0;
}

.mode-picker.segmented.single::before {
  display: none;
}

.mode-picker.segmented.seg-right::before {
  transform: translateX(100%);
}

.mode-picker.segmented.mode-mini {
  width: 220px;
  min-width: 220px;
}

.mode-picker.segmented.mode-mini .mode-btn {
  min-height: 32px;
  padding: 6px 8px;
  font-size: 0.86rem;
}

.mode-btn,
.start-btn,
button[type="submit"],
.full-top button {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 140ms ease, background-color 140ms ease;
}

.mode-btn {
  background: var(--mode-btn-bg);
  color: var(--ink);
  border: 1px solid var(--edge);
}

.mode-picker.segmented .mode-btn {
  position: relative;
  z-index: 1;
  flex: 1 1 0;
  border: 0;
  border-radius: 9px;
  background: transparent;
  min-height: 40px;
  color: var(--muted);
  transition: color 180ms ease;
}

.mode-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.mode-picker.segmented .mode-btn.active {
  background: transparent;
  border-color: transparent;
  color: #fff;
  box-shadow: none;
}

.start-btn,
button[type="submit"],
.full-top button {
  background: var(--accent);
  color: #fff;
}

.full-row > button {
  border: none;
  border-radius: 10px;
  padding: 9px 12px;
  font-weight: 700;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
}

.occlusion-table {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  border: 3px solid var(--table-outline);
  border-radius: 12px;
  overflow: hidden;
  background: var(--card);
}

.occlusion-table th {
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 10px;
  border: 2px solid var(--table-grid);
  background: color-mix(in srgb, var(--panel) 75%, var(--mode-btn-bg) 25%);
  text-align: left;
}

.occlusion-cell {
  border: 2px solid var(--table-grid);
  padding: 10px 12px;
  background: color-mix(in srgb, var(--card) 92%, var(--panel) 8%);
  vertical-align: middle;
  height: 92px;
}

.occlusion-table tbody tr:nth-child(even) .occlusion-cell {
  background: color-mix(in srgb, var(--card) 86%, var(--panel) 14%);
}

:root[data-theme="dark"] .occlusion-cell,
body[data-theme="dark"] .occlusion-cell {
  background: color-mix(in srgb, var(--card) 80%, #1f2b3a 20%);
}

:root[data-theme="dark"] .occlusion-table tbody tr:nth-child(even) .occlusion-cell,
body[data-theme="dark"] .occlusion-table tbody tr:nth-child(even) .occlusion-cell {
  background: color-mix(in srgb, var(--card) 74%, #223246 26%);
}

.occlusion-line {
  display: grid;
  grid-template-columns: 3.2ch 1fr;
  align-items: center;
  gap: 16px;
}

.occlusion-mask {
  height: 20px;
  border-radius: 6px;
  border: 2px solid color-mix(in srgb, var(--edge) 68%, #000 32%);
  background: color-mix(in srgb, var(--mode-btn-bg) 82%, var(--panel) 18%);
  max-width: 100%;
}

:root[data-theme="dark"] .occlusion-mask,
body[data-theme="dark"] .occlusion-mask {
  border-color: color-mix(in srgb, var(--table-grid) 86%, #fff 14%);
  background: color-mix(in srgb, var(--accent) 24%, var(--card) 76%);
}

.occlusion-solved {
  color: var(--ok);
  font-weight: 700;
  font-size: 1.02rem;
}

.occlusion-active-input {
  border: 2px solid color-mix(in srgb, var(--accent) 75%, #fff 25%);
  background: color-mix(in srgb, var(--card) 88%, var(--mode-btn-bg) 12%);
  min-width: 0;
  transition: box-shadow 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.occlusion-active-input.pulse-ok {
  border-color: color-mix(in srgb, var(--ok) 78%, #fff 22%);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 35%, transparent 65%);
  animation: occlusionInputPulseOk 340ms ease-out;
}

.occlusion-active-input.pulse-bad {
  border-color: color-mix(in srgb, var(--bad) 78%, #fff 22%);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--bad) 30%, transparent 70%);
  animation: occlusionInputPulseBad 340ms ease-out;
}

.occlusion-active-input::placeholder {
  color: var(--muted);
  opacity: 0.9;
  font-size: 0.88rem;
}

.occlusion-feedback-row {
  margin-top: 10px;
  position: relative;
  width: 100%;
  min-height: 74px;
}

.occlusion-feedback-row .feedback {
  width: 100%;
  min-height: 74px;
}

.occlusion-feedback-row .feedback.empty {
  visibility: hidden;
}

.table-flash {
  position: absolute;
  right: 10px;
  top: 50%;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  opacity: 0;
  transform: translateY(-50%) scale(0.85);
}

.table-flash.ok {
  background: color-mix(in srgb, var(--ok) 88%, #fff 12%);
  color: #fff;
}

.table-flash.bad {
  background: color-mix(in srgb, var(--bad) 88%, #fff 12%);
  color: #fff;
}

.table-flash.show {
  animation: tableFlash 420ms ease-out;
}

.start-btn:hover,
button[type="submit"]:hover,
.mode-btn:hover,
.full-top button:hover,
.theme-toggle:hover {
  transform: translateY(-1px);
}

.meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.meta-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.inline-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.inline-toggle input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 40px;
  height: 22px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--mode-btn-bg) 70%, #999 30%);
  border: 1px solid var(--edge);
  position: relative;
  cursor: pointer;
  transition: background 160ms ease;
}

.inline-toggle input[type="checkbox"]::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  transition: transform 160ms ease;
}

.inline-toggle input[type="checkbox"]:checked {
  background: color-mix(in srgb, var(--accent) 88%, #fff 12%);
}

.inline-toggle input[type="checkbox"]:checked::before {
  transform: translateX(18px);
}

.round-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.round-header h2 {
  margin: 0;
}

.round-spacer {
  flex: 1 1 auto;
}

.skip-btn {
  border: 1px solid var(--edge);
  border-radius: 9px;
  padding: 8px 12px;
  font-weight: 700;
  color: var(--muted);
  background: var(--card);
  cursor: pointer;
}

.options-panel {
  border: 1px solid var(--edge);
  border-radius: 10px;
  padding: 10px;
  background: var(--card);
  display: grid;
  gap: 8px;
}

.toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.mode-toggle-row {
  align-items: center;
}

.toggle-row input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--mode-btn-bg) 70%, #999 30%);
  border: 1px solid var(--edge);
  position: relative;
  cursor: pointer;
  transition: background 160ms ease;
}

.toggle-row input[type="checkbox"]::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform 160ms ease;
}

.toggle-row input[type="checkbox"]:checked {
  background: color-mix(in srgb, var(--accent) 88%, #fff 12%);
}

.toggle-row input[type="checkbox"]:checked::before {
  transform: translateX(18px);
}

.toggle-row .small-number-input {
  width: 56px;
  min-width: 56px;
  flex: 0 0 56px;
  text-align: center;
  font-weight: 700;
  padding: 4px 6px;
  min-height: 30px;
}

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

.prompt-main {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1 1 auto;
}

.prompt-main .prompt-text {
  margin-top: 0;
}

.prompt-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.prompt-text {
  margin-top: 6px;
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 650;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  letter-spacing: 0.02em;
  min-height: 1.8rem;
  animation: reveal 210ms ease;
  min-width: 0;
  overflow-wrap: anywhere;
}

.icon-btn {
  border: 1px solid var(--edge);
  border-radius: 999px;
  width: 32px;
  height: 32px;
  background: var(--card);
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

.translation-bubble {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 6;
  border: 1px solid var(--edge);
  border-radius: 8px;
  padding: 8px 10px;
  background: var(--card);
  color: var(--muted);
  font-size: 0.9rem;
  max-width: min(60ch, 78vw);
  box-shadow: 0 8px 18px var(--shadow);
}

.add-verb-btn {
  background: var(--mode-btn-bg);
  color: var(--ink);
  border: 1px solid var(--edge);
}

.add-verb-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.field-label {
  display: block;
  margin: 12px 0 6px;
  color: var(--muted);
}

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

input {
  width: 100%;
  border: 1px solid var(--edge);
  border-radius: 8px;
  padding: 10px;
  background: var(--card);
  color: var(--ink);
  font-size: 1rem;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
}

input:focus {
  outline: 2px solid var(--focus-outline);
  outline-offset: 1px;
}

.full-grid {
  margin-top: 14px;
  display: grid;
  gap: 10px;
  grid-template-rows: repeat(3, auto);
  grid-auto-flow: column;
}

.full-row {
  border: 1px solid var(--edge);
  border-radius: 10px;
  padding: 10px;
  display: grid;
  gap: 8px;
  background: var(--card);
}

.full-row:nth-child(1) { background: color-mix(in srgb, var(--card) 88%, #c8dbf7 12%); }
.full-row:nth-child(2) { background: color-mix(in srgb, var(--card) 90%, #d5e3f8 10%); }
.full-row:nth-child(3) { background: color-mix(in srgb, var(--card) 92%, #e7effb 8%); }
.full-row:nth-child(4) { background: color-mix(in srgb, var(--card) 90%, #c8dbf7 10%); }
.full-row:nth-child(5) { background: color-mix(in srgb, var(--card) 92%, #d5e3f8 8%); }
.full-row:nth-child(6) { background: color-mix(in srgb, var(--card) 94%, #e7effb 6%); }

body[data-theme="dark"] .full-row:nth-child(1) { background: color-mix(in srgb, var(--card) 88%, #233957 12%); }
body[data-theme="dark"] .full-row:nth-child(2) { background: color-mix(in srgb, var(--card) 90%, #24354d 10%); }
body[data-theme="dark"] .full-row:nth-child(3) { background: color-mix(in srgb, var(--card) 92%, #223043 8%); }
body[data-theme="dark"] .full-row:nth-child(4) { background: color-mix(in srgb, var(--card) 90%, #233957 10%); }
body[data-theme="dark"] .full-row:nth-child(5) { background: color-mix(in srgb, var(--card) 92%, #24354d 8%); }
body[data-theme="dark"] .full-row:nth-child(6) { background: color-mix(in srgb, var(--card) 94%, #223043 6%); }

.full-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pronoun {
  font-weight: 800;
  font-size: 1.05rem;
}

.feedback {
  min-height: 1.35rem;
  font-size: 0.95rem;
  margin-top: 10px;
}

.feedback.ok {
  color: var(--ok);
}

.feedback.bad {
  color: var(--bad);
}

.feedback-card {
  background: var(--card);
  border: 1px solid var(--edge);
  border-radius: 10px;
  padding: 10px;
}

.feedback-card .status-pill {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.feedback-card.ok .status-pill {
  background: var(--ok-soft-bg);
  color: var(--ok);
  border: 1px solid var(--ok-soft-border);
}

.feedback-card.ok {
  animation: okPulse 240ms ease-out;
}

.feedback-card.bad .status-pill {
  background: var(--bad-soft-bg);
  color: var(--bad);
  border: 1px solid var(--bad-soft-border);
}

.feedback-line {
  margin-top: 4px;
  color: var(--muted);
}

.summary {
  margin-top: 10px;
  padding: 10px;
  border-radius: 10px;
  background: var(--card);
  border: 1px solid var(--edge);
}

.summary .summary-next {
  margin-top: 10px;
}

.lessons h2 {
  margin: 0 0 6px;
}

.lesson-help {
  margin: 0 0 12px;
  color: var(--muted);
}

.lesson-form {
  display: flex;
  gap: 8px;
}

.lesson-input-wrap {
  position: relative;
  flex: 1 1 auto;
}

.lesson-list {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.lesson-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 9px;
  border: 1px solid var(--edge);
  background: var(--card);
}

.lesson-row.is-disabled {
  opacity: 0.75;
}

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

.lesson-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.verb-name {
  font-weight: 700;
}

.pill {
  font-size: 0.8rem;
  color: var(--muted);
  border: 1px solid var(--edge);
  border-radius: 999px;
  padding: 2px 8px;
}

.remove-btn {
  border: 1px solid var(--remove-border);
  color: var(--bad);
  background: var(--remove-bg);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

.toggle-btn {
  border: 1px solid var(--edge);
  color: var(--ink);
  background: var(--card);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

.reset-btn {
  border: 1px solid var(--edge);
  color: var(--ink);
  background: color-mix(in srgb, var(--card) 82%, var(--mode-btn-bg) 18%);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

.suggestions {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 5;
  background: var(--card);
  border: 1px solid var(--edge);
  border-radius: 8px;
  box-shadow: 0 8px 18px var(--shadow);
  max-height: 260px;
  overflow-y: auto;
}

.suggestion-item {
  padding: 8px 10px;
  cursor: pointer;
  border-bottom: 1px solid var(--edge);
}

.suggestion-item:last-child {
  border-bottom: none;
}

.suggestion-item:hover {
  background: var(--suggest-hover);
}

.banner {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 10px;
}

.meta-strip {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.86rem;
  text-align: center;
  padding: 6px 8px;
}

.quick-check {
  position: fixed;
  left: 50%;
  top: 22%;
  transform: translate(-50%, -50%) scale(0.9);
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(29, 127, 78, 0.95);
  color: #fff;
  font-size: 2rem;
  font-weight: 800;
  box-shadow: 0 14px 30px rgba(29, 127, 78, 0.35);
  opacity: 0;
  pointer-events: none;
  z-index: 30;
}

.quick-check.show {
  animation: quickCheck 440ms ease-out forwards;
}

.quick-wrong {
  position: fixed;
  left: 50%;
  top: 22%;
  transform: translate(-50%, -50%) scale(0.9);
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(163, 35, 35, 0.95);
  color: #fff;
  font-size: 1.8rem;
  font-weight: 800;
  box-shadow: 0 14px 30px rgba(163, 35, 35, 0.35);
  opacity: 0;
  pointer-events: none;
  z-index: 30;
}

.quick-wrong.show {
  animation: quickWrong 440ms ease-out forwards;
}

.banner.error {
  background: var(--banner-bad-bg);
  color: var(--bad);
  border: 1px solid var(--banner-bad-border);
}

.banner.notice {
  background: var(--banner-ok-bg);
  color: var(--ok);
  border: 1px solid var(--banner-ok-border);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.44);
  display: grid;
  place-items: center;
  z-index: 80;
  padding: 14px;
}

.modal-card {
  width: min(420px, 100%);
  border: 1px solid var(--edge);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 16px 36px var(--shadow);
  padding: 14px;
}

.modal-card h3 {
  margin: 0 0 8px;
}

.modal-help {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.hidden {
  display: none;
}

@keyframes okPulse {
  0% {
    transform: scale(0.985);
    box-shadow: 0 0 0 0 rgba(53, 189, 118, 0.28);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 8px rgba(53, 189, 118, 0);
  }
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes quickCheck {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.78);
  }
  25% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.04);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -60%) scale(1.04);
  }
}

@keyframes quickWrong {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.78);
  }
  25% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.04);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -60%) scale(1.04);
  }
}

@keyframes tableFlash {
  0% {
    opacity: 0;
    transform: translateY(-50%) scale(0.8);
  }
  30% {
    opacity: 1;
    transform: translateY(-50%) scale(1.05);
  }
  100% {
    opacity: 0;
    transform: translateY(-50%) scale(1);
  }
}

@keyframes occlusionInputPulseOk {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.015);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes occlusionInputPulseBad {
  0% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-2px);
  }
  50% {
    transform: translateX(2px);
  }
  75% {
    transform: translateX(-1px);
  }
  100% {
    transform: translateX(0);
  }
}

@media (max-width: 640px) {
  .shell {
    margin-top: 8px;
  }

  .input-row,
  .lesson-form,
  .hero-top {
    flex-direction: column;
  }

  .hero-actions {
    width: 100%;
  }

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

  .prompt-main {
    width: 100%;
  }

  .prompt-actions {
    width: 100%;
  }

  .meta {
    flex-direction: column;
  }

  .meta-actions {
    width: 100%;
    justify-content: space-between;
  }

  .meta-strip {
    text-align: left;
    line-height: 1.4;
  }

  .mode-picker {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .mode-picker.segmented.mode-mini {
    width: 100%;
    min-width: 0;
  }

  .mode-btn,
  .start-btn,
  button[type="submit"],
  .full-top button,
  .summary .summary-next,
  .theme-toggle,
  .remove-btn,
  .toggle-btn,
  .reset-btn,
  .modal-actions .skip-btn {
    width: 100%;
    min-height: 44px;
  }

  .modal-actions {
    flex-direction: column;
  }

  .top-nav {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
  }

  .top-nav-link {
    text-align: center;
    padding: 10px 12px;
  }

  .full-grid {
    grid-template-rows: none;
    grid-auto-flow: row;
    grid-template-columns: 1fr;
  }

  .occlusion-table {
    border-radius: 10px;
  }

  .occlusion-cell {
    height: 84px;
    padding: 8px 10px;
  }

  .occlusion-line {
    gap: 12px;
    grid-template-columns: 3ch 1fr;
  }

  .table-flash {
    right: 8px;
  }
}