/* --- Iyaku Study — dark minimalist theme --- */
:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: rgba(37, 99, 235, 0.18);
  --primary-gradient: linear-gradient(135deg, #3b82f6, #2563eb);

  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #10b981;
  --easy: #38bdf8;

  --bg-color: #09090b;
  --surface-color: #18181b;
  --surface-hover: #27272a;
  --surface-overlay: rgba(24, 24, 27, 0.75);

  --text-color: #fafafa;
  --text-muted: #a1a1aa;
  --border-color: #27272a;

  --radius: 14px;
  --font-ja: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

[lang="ja"] {
  font-family: var(--font-ja);
}

a {
  color: var(--primary);
}

button {
  font: inherit;
  color: inherit;
}

kbd {
  font: 600 0.7rem/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  padding: 2px 5px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-muted);
}

.muted {
  color: var(--text-muted);
}
.small {
  font-size: 0.85rem;
}
.danger {
  color: var(--danger);
}
mark {
  background: var(--primary-soft);
  color: inherit;
  border-radius: 4px;
  padding: 0 2px;
}

/* --- Header --- */
.app-header {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
  height: 60px;
  background-color: var(--surface-overlay);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  z-index: 10;
}

.brand {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.2px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  flex-shrink: 0;
}
.brand-text {
  display: inline-block;
}
/* The mark is CSS-generated text: the Iyaku Reader extension rewrites Japanese
   text nodes (shadow-DOM wrappers), which broke the header layout. */
.brand-mark::before {
  content: "いやく";
}
.brand-mark {
  font-family: var(--font-ja);
  font-size: 0.8rem;
  padding: 3px 7px;
  border-radius: 6px;
  background: var(--primary-gradient);
  color: #fff;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}
.header-link {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.header-link:hover {
  color: var(--text-color);
  border-color: var(--surface-hover);
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-color);
  font-size: 1.15rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}
.icon-btn:hover {
  background-color: var(--surface-hover);
}
.icon-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

/* --- Layout --- */
.main-content {
  flex: 1;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}
.screen[hidden] {
  display: none !important;
}
/* tutor (talk) session inside the card stage */
.card-stage.talk-stage {
  min-height: 0;
}
.card-stage.talk-stage .talk-mode {
  height: calc(100dvh - 60px - 58px - 24px);
  min-height: 360px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  overflow: hidden;
}

/* --- Buttons --- */
.btn-primary,
.btn-ghost {
  border-radius: 12px;
  padding: 12px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    background 0.2s ease,
    border-color 0.2s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn-primary {
  background: var(--primary-gradient);
  border: none;
  color: #fff;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
}
.btn-primary:disabled {
  background: var(--surface-hover);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-color);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--surface-hover);
}
.btn-ghost:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.btn-lg {
  padding: 16px 24px;
  font-size: 1.05rem;
  width: 100%;
}
.btn-link {
  background: none;
  border: none;
  color: var(--primary);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 0.85rem;
}
.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 34px;
  height: 34px;
  cursor: pointer;
  font-size: 0.9rem;
}
.btn-icon:hover {
  background: var(--surface-hover);
}

.select,
.settings-content select,
.settings-content input[type="number"] {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  color: var(--text-color);
  font-size: 0.95rem;
  outline: none;
}
.select:focus,
.settings-content select:focus {
  border-color: var(--primary);
}

/* --- Home --- */
.hero {
  text-align: center;
  padding: 48px 8px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: center;
}
.hero h2 {
  margin: 0;
  font-size: 1.7rem;
  letter-spacing: -0.5px;
}
.hero .btn-lg {
  max-width: 320px;
}

.home-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  animation: floatIn 0.35s ease;
}
.home-top {
  display: flex;
  align-items: flex-end;
  gap: 12px;
}
.field {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  font-weight: 600;
}
.link-muted {
  color: var(--text-muted);
  font-size: 0.85rem;
  text-decoration: none;
  white-space: nowrap;
  padding-bottom: 12px;
}
.link-muted:hover {
  color: var(--text-color);
}

.deck-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 0.9rem;
  color: var(--text-muted);
  min-height: 1.4em;
}
.deck-stats strong {
  color: var(--text-color);
  font-size: 1.05rem;
}

.study-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.switch-opt {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s ease;
}
.switch-opt .mode-icon {
  font-size: 1.4rem;
}
.switch-opt .mode-label {
  font-weight: 700;
  font-size: 0.95rem;
}
.switch-opt .mode-sub {
  font-size: 0.75rem;
}
.switch-opt.on {
  border-color: var(--primary);
  background: var(--primary-soft);
  color: var(--text-color);
}
.speaking-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
}
.speaking-info .mode-count {
  font-size: 0.85rem;
  color: var(--text-color);
}
.speaking-info[hidden],
.silent-modes[hidden],
.level-filter[hidden] {
  display: none;
}

.modes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.modes.three {
  grid-template-columns: repeat(3, 1fr);
}
.mode-chip {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-muted);
}
.mode-chip .mode-icon {
  font-size: 1.4rem;
  filter: grayscale(1);
  opacity: 0.6;
}
.mode-chip .mode-label {
  font-weight: 600;
  font-size: 0.9rem;
}
.mode-chip .mode-count {
  font-size: 0.75rem;
  min-height: 1em;
}
.mode-chip.on {
  border-color: var(--primary);
  background: var(--primary-soft);
  color: var(--text-color);
}
.mode-chip.on .mode-icon {
  filter: none;
  opacity: 1;
}

.level-filter {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0 14px;
}
.level-filter summary {
  cursor: pointer;
  padding: 12px 0;
  display: flex;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.9rem;
  list-style: none;
}
.level-filter summary::-webkit-details-marker {
  display: none;
}
.level-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 0 14px;
}
.level-opt {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.85rem;
  cursor: pointer;
}
.level-opt input {
  accent-color: var(--primary);
}
.level-opt:has(input:checked) {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.home-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.home-note {
  text-align: center;
  min-height: 0;
}

/* --- Session --- */
.session-bar {
  position: sticky;
  top: 60px;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 -16px 18px;
  padding: 8px 16px;
  background: var(--surface-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.session-status {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 4px 10px;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.session-status::before {
  flex-shrink: 0;
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
}
.session-status.connected::before,
.session-status.listening::before {
  background: var(--success);
}
.session-status.speaking::before {
  background: var(--primary);
}
.session-status.connecting::before,
.session-status.thinking::before {
  background: var(--warning);
}
.session-status.error::before {
  background: var(--danger);
}
.session-status[hidden] {
  display: none;
}
.progress {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: var(--surface-hover);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--primary-gradient);
  transition: width 0.3s ease;
}
.progress-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 56px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.card-stage {
  min-height: 320px;
}
.stage-loading {
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.spinner {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 3px solid var(--surface-hover);
  border-top-color: var(--primary);
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
.card-stage > * {
  animation: floatIn 0.3s ease;
}

.card-kind {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  font-weight: 600;
  text-align: center;
  margin-bottom: 14px;
}
.card-kind .card-context {
  text-transform: none;
  letter-spacing: 0;
}
.card-kind a {
  color: inherit;
}

/* flashcard */
.flash-card,
.speak-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: center;
  text-align: center;
}
.flash-glyph {
  font-size: clamp(5rem, 24vw, 8.5rem);
  line-height: 1.05;
  cursor: pointer;
  user-select: none;
  padding: 8px 0;
}
.flash-card.revealed .flash-glyph {
  font-size: clamp(3.5rem, 16vw, 5.5rem);
}
.flash-back {
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
  animation: floatIn 0.25s ease;
}
.flash-back[hidden],
.flash-front-sentence[hidden] {
  display: none;
}
.flash-front-sentence {
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--text-muted);
}
.flash-front-sentence mark {
  color: var(--text-color);
}
.flash-meanings {
  font-size: 1.35rem;
  font-weight: 600;
}
.flash-readings {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 18px;
}
.reading-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}
.reading-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
  letter-spacing: 0.5px;
}
.chip {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.95rem;
}
.flash-examples {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.example-word {
  color: var(--text-color);
  text-decoration: none;
  border-bottom: 1px dashed var(--text-muted);
  font-size: 1.1rem;
}
.flash-sentence {
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sentence-ja {
  font-size: 1.2rem;
  line-height: 1.5;
}
.sentence-en {
  color: var(--text-muted);
  font-size: 0.95rem;
}
.flash-actions {
  width: 100%;
}
.flash-actions .btn-primary {
  width: 100%;
  padding: 14px;
}

/* speak card */
.speak-prompt {
  font-size: 1.45rem;
  line-height: 1.4;
  font-weight: 500;
}
.speak-prompt[lang="ja"] {
  font-size: 1.5rem;
}
.speak-instruction {
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
}
.speak-live {
  min-height: 1.6em;
  color: var(--text-muted);
  font-style: italic;
  font-family: var(--font-ja);
  font-size: 1.05rem;
}
.speak-controls {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.mic-btn {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  background: var(--bg-color);
  font-size: 1.8rem;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mic-btn.vad {
  pointer-events: none;
}
.mic-btn.listening {
  border-color: var(--success);
  animation: pulse-green 1.6s infinite;
}
.mic-btn.speaking {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.15);
  animation: pulse-red 1.2s infinite;
}
.mic-btn.processing {
  border-color: var(--primary);
  opacity: 0.7;
}
.speak-typed {
  display: flex;
  gap: 8px;
  width: 100%;
}
.speak-input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  color: var(--text-color);
  font-size: 1rem;
  outline: none;
}
.speak-input:focus {
  border-color: var(--primary);
}
.speak-result {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: floatIn 0.25s ease;
}
.compare {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
}
.compare-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.compare-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  min-width: 30px;
}
.compare-text {
  flex: 1;
  font-size: 1.15rem;
  line-height: 1.45;
}
.said-translation {
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.95rem;
}
.replay {
  width: 100%;
  height: 36px;
}

/* grade bar */
.grade-bar {
  position: sticky;
  bottom: 12px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 18px;
  padding: 8px;
  background: var(--surface-overlay);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  animation: floatIn 0.2s ease;
}
.grade-bar[hidden] {
  display: none;
}
.grade {
  border-radius: 12px;
  border: 2px solid;
  background: transparent;
  padding: 10px 4px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.grade kbd {
  margin-top: 2px;
}
.grade-label {
  font-weight: 700;
  font-size: 0.9rem;
}
.grade-interval {
  font-size: 0.75rem;
  opacity: 0.8;
}
.grade-again {
  color: var(--danger);
  border-color: var(--danger);
}
.grade-hard {
  color: var(--warning);
  border-color: var(--warning);
}
.grade-good {
  color: var(--success);
  border-color: var(--success);
}
.grade-easy {
  color: var(--easy);
  border-color: var(--easy);
}
.grade:hover,
.grade.suggested {
  color: #fff;
}
.grade-again:hover,
.grade-again.suggested {
  background: var(--danger);
}
.grade-hard:hover,
.grade-hard.suggested {
  background: var(--warning);
}
.grade-good:hover,
.grade-good.suggested {
  background: var(--success);
}
.grade-easy:hover,
.grade-easy.suggested {
  background: var(--easy);
}
.grade.suggested kbd {
  color: #fff;
}

/* summary */
.summary-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 30px 22px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 22px;
  animation: floatIn 0.3s ease;
}
.summary-card h2 {
  margin: 0;
}
.summary-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
}
.sum {
  display: flex;
  flex-direction: column;
}
.sum strong {
  font-size: 2rem;
}
.sum span {
  color: var(--text-muted);
  font-size: 0.85rem;
}
.summary-grades {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}
.grade-pill {
  border: 1px solid;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.85rem;
  font-weight: 600;
}
.summary-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* --- Settings drawer --- */
.settings-panel {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  max-width: 380px;
  height: 100%;
  height: 100dvh;
  background-color: var(--surface-color);
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
  transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border-color);
}
.settings-panel.open {
  right: 0;
}
.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px 0 24px;
  height: 60px;
  border-bottom: 1px solid var(--border-color);
}
.settings-header h2 {
  margin: 0;
  font-size: 1.1rem;
}
.settings-content {
  padding: 20px 24px 40px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.settings-account {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.settings-account .btn-ghost[hidden] {
  display: none;
}
.settings-content details {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0 14px;
}
.settings-content summary {
  cursor: pointer;
  padding: 12px 0;
  font-weight: 600;
  font-size: 0.9rem;
}
.settings-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 2px 0 16px;
}
.settings-group label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.settings-group label.check {
  flex-direction: row;
  align-items: center;
  gap: 10px;
  color: var(--text-color);
}
.settings-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}
.settings-foot {
  line-height: 1.5;
}

/* --- Auth modal overrides (authmodal.css ships a grey secondary button) --- */
.auth-modal .btn-secondary,
.auth-modal .btn-primary {
  background: var(--primary-gradient) !important;
  color: #fff !important;
  border: none !important;
  border-radius: 12px;
  font-weight: 600;
}
.auth-modal .btn-secondary:hover,
.auth-modal .btn-primary:hover {
  filter: brightness(1.1);
}

/* --- Toast --- */
#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 20px);
  background: var(--surface-hover);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  z-index: 2000;
}
#toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* --- Animations --- */
@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes pulse-red {
  0% {
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.5);
  }
  70% {
    box-shadow: 0 0 0 16px rgba(239, 68, 68, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0);
  }
}
@keyframes pulse-green {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.45);
  }
  70% {
    box-shadow: 0 0 0 16px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

@media (max-width: 480px) {
  body[data-screen="session"] .main-content {
    padding-top: 8px;
  }
  body[data-screen="session"] .session-bar {
    margin-bottom: 8px;
  }
  .card-stage {
    min-height: 0;
  }
  .modes,
  .modes.three {
    gap: 6px;
  }
  .session-bar {
    margin-bottom: 8px;
    padding: 6px 12px;
  }
  .session-status {
    font-size: 0.6rem;
    padding: 3px 7px;
    max-width: 110px;
  }
  .mode-chip {
    padding: 12px 6px;
  }
  .mode-chip .mode-label {
    font-size: 0.8rem;
  }
  .home-card {
    padding: 16px;
  }
  .grade-label {
    font-size: 0.8rem;
  }
  .grade kbd {
    display: none;
  }
  .header-link {
    max-width: 120px;
  }
}

/* --- Error banner (errors.js) --- */
#errorBanner {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translate(-50%, 24px);
  width: min(680px, calc(100% - 32px));
  background: #2a1215;
  border: 1px solid #7f1d1d;
  color: #fecaca;
  border-radius: 14px;
  padding: 12px 14px;
  z-index: 3000;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}
#errorBanner.show {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}
.error-banner-inner {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}
.error-banner-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.9rem;
  min-width: 0;
}
.error-banner-msg {
  overflow-wrap: anywhere;
}
.error-banner-details {
  font-size: 0.75rem;
  opacity: 0.8;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.error-banner-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}
.error-banner-actions button {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 0.85rem;
}
.error-banner-actions button:hover {
  background: rgba(255, 255, 255, 0.16);
}