/* =============================================================================
   Hanasou — styles.css
   Mobile-first. Dark theme. CSS variables throughout.
   ============================================================================= */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Ensure the HTML hidden attribute is always respected, even when a class sets display. */
[hidden] { display: none !important; }

:root {
  /* Colours */
  --color-bg:           #1a1a2e;
  --color-surface:      #16213e;
  --color-surface-2:    #0f3460;
  --color-accent:       #e94560;
  --color-accent-hover: #c73652;
  --color-text:         #eaeaea;
  --color-muted:        #8892a4;
  --color-border:       #2a3a5c;
  --color-success:      #4caf7d;
  --color-error:        #ff6b6b;

  /* Typography */
  --base-font-size: 16px;           /* controlled by the font size setting; rem anchors to this */
  --font-main:      system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-size-base: 1rem;
  --font-size-sm:   0.875rem;
  --font-size-xs:   0.8rem;
  --line-height:    1.6;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Accessibility */
  --tap-target: 48px;
}

/* ── Base ──────────────────────────────────────────────────────────────────── */

html {
  font-size: var(--base-font-size); /* rem anchor — all relative sizes scale from here */
}

html, body {
  height: 100%;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-main);
  line-height: var(--line-height);
  -webkit-font-smoothing: antialiased;
}

/* ── Screen management ─────────────────────────────────────────────────────── */

#app {
  min-height: 100dvh;
}

.screen[hidden] {
  display: none;
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font: inherit;
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
}

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-border);
}

/* ── Inline status messages ────────────────────────────────────────────────── */

.status-message {
  font-size: var(--font-size-sm);
  min-height: 1.4em;
  margin-top: var(--space-sm);
}

.status-success { color: var(--color-success); }
.status-error   { color: var(--color-error);   }
.status-loading { color: var(--color-muted);   }

/* ── Settings screen ───────────────────────────────────────────────────────── */

.settings-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.settings-header .app-name {
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.settings-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
}

.settings-body {
  padding: var(--space-lg);
  max-width: 560px;
  margin: 0 auto;
  padding-bottom: var(--space-xl);
}

/* ── Form fields ───────────────────────────────────────────────────────────── */

.field-group {
  margin-bottom: var(--space-lg);
}

.field-label {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: var(--space-sm);
}

.field-group fieldset {
  border: none;
}

.field-group fieldset legend {
  display: block;
  width: 100%;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: var(--space-sm);
}

.field-group input[type="text"],
.field-group input[type="password"],
.field-group select {
  width: 100%;
  min-height: var(--tap-target);
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font: inherit;
  font-size: var(--font-size-base);
  transition: border-color 0.15s;
  appearance: none;
  -webkit-appearance: none;
}

/* Custom dropdown arrow */
.field-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238892a4' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.875rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

.field-group input:focus,
.field-group select:focus {
  outline: none;
  border-color: var(--color-accent);
}

.field-group input:disabled,
.field-group select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.field-hint {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  margin-top: var(--space-xs);
  line-height: 1.4;
}

.apikey-helper a {
  color: var(--color-muted);
  text-underline-offset: 2px;
}

.apikey-helper a:hover {
  color: var(--color-text);
}

.field-error {
  font-size: var(--font-size-sm);
  color: var(--color-error);
  margin-top: var(--space-xs);
  min-height: 1.2em;
}

/* ── Radio cards (practice profile) ───────────────────────────────────────── */

.radio-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.radio-card {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  min-height: var(--tap-target);
  transition: border-color 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.radio-card:has(input:checked) {
  border-color: var(--color-accent);
}

.radio-card.disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.radio-card input[type="radio"] {
  flex-shrink: 0;
  margin-top: 3px;
  width: 18px;
  height: 18px;
  accent-color: var(--color-accent);
  cursor: inherit;
}

.radio-card-text strong {
  display: block;
  margin-bottom: 2px;
}

.radio-card-text small {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

/* ── Toggle group (binary options e.g. Normal / Slow) ──────────────────────── */

.toggle-group {
  display: flex;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.toggle-option {
  flex: 1;
  position: relative;
}

.toggle-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-option span {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1rem;
  min-height: var(--tap-target);
  background: var(--color-surface);
  cursor: pointer;
  font-size: var(--font-size-sm);
  text-align: center;
  transition: background 0.15s, color 0.15s;
  border-right: 1px solid var(--color-border);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.toggle-option:last-child span {
  border-right: none;
}

.toggle-option input[type="radio"]:checked + span {
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

.toggle-option input[type="radio"]:focus-visible + span {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.toggle-option input[type="radio"]:disabled + span {
  opacity: 0.45;
  cursor: not-allowed;
}

/* ── Test connection row ───────────────────────────────────────────────────── */

.test-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.test-row .btn {
  width: auto;
  flex-shrink: 0;
}

.test-row .status-message {
  margin-top: 0;
  flex: 1;
}

/* ── Font size slider ──────────────────────────────────────────────────────── */

.fontsize-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.fontsize-a-sm {
  font-size: 0.8rem;
  color: var(--color-muted);
  flex-shrink: 0;
  line-height: 1;
  user-select: none;
}

.fontsize-a-lg {
  font-size: 1.25rem;
  color: var(--color-muted);
  flex-shrink: 0;
  line-height: 1;
  user-select: none;
}

.fontsize-row input[type="range"] {
  flex: 1;
  accent-color: var(--color-accent);
  height: 4px;
  cursor: pointer;
}

.fontsize-value {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  min-width: 3rem;
  text-align: right;
  flex-shrink: 0;
}

/* ── Form actions ──────────────────────────────────────────────────────────── */

.form-actions {
  padding-top: var(--space-sm);
}

/* ── Home screen ───────────────────────────────────────────────────────────── */

.home-screen {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding: var(--space-xl) var(--space-lg);
  max-width: 480px;
  margin: 0 auto;
}

.home-header {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-xl);
}

.home-kanji {
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.home-app-name {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: var(--space-xs);
  margin-bottom: var(--space-md);
}

.home-greeting {
  font-size: 1.15rem;
  color: var(--color-muted);
}

/* ── Navigation cards ──────────────────────────────────────────────────────── */

.home-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.nav-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
  padding: 1.125rem var(--space-lg);
  min-height: 72px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.nav-card:active {
  transform: scale(0.98);
}

.nav-card:hover {
  background: var(--color-surface-2);
  border-color: var(--color-muted);
}

.nav-card--primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.nav-card--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.nav-card-text {
  flex: 1;
}

.nav-card-text strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.nav-card-text span {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

.nav-card--primary .nav-card-text span {
  color: rgba(255, 255, 255, 0.75);
}

.nav-card-arrow {
  font-size: 1.2rem;
  flex-shrink: 0;
  opacity: 0.6;
}

/* ── Home: session history ─────────────────────────────────────────────────── */

.home-history {
  margin-top: var(--space-xl);
}

.home-history-heading {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: var(--space-md);
}

.history-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.history-entry {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
}

.history-entry-main {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: 3px;
}

.history-scenario {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.history-difficulty {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

.history-entry-meta {
  display: flex;
  gap: var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

/* ── Scenarios screen ──────────────────────────────────────────────────────── */

.scenarios-screen {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  max-width: 560px;
  margin: 0 auto;
}

.scenarios-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}

.scenarios-header h1 {
  font-size: 1.2rem;
  font-weight: 700;
}

.btn-back {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--tap-target);
  height: var(--tap-target);
  min-width: var(--tap-target);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1.25rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.btn-back:hover {
  background: var(--color-surface-2);
}

/* Scenario list */

#scenarios-list-view,
#scenarios-diff-view {
  padding: var(--space-lg);
}

.scenarios-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.scenario-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
  padding: 1rem var(--space-lg);
  min-height: 72px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.scenario-card:hover {
  background: var(--color-surface-2);
  border-color: var(--color-muted);
}

.scenario-card:active {
  transform: scale(0.98);
}

.scenario-card-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
  width: 2.25rem;
  text-align: center;
}

.scenario-card-text {
  flex: 1;
}

.scenario-card-text strong {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.scenario-card-ja {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

.scenario-card-arrow {
  font-size: 1.4rem;
  color: var(--color-muted);
  flex-shrink: 0;
}

/* Difficulty picker */

.diff-scenario-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.diff-scenario-icon {
  font-size: 1.5rem;
}

.difficulty-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.difficulty-card {
  width: 100%;
  padding: 1rem var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.difficulty-card:hover {
  background: var(--color-surface-2);
  border-color: var(--color-muted);
}

.difficulty-card:active {
  transform: scale(0.98);
}

.difficulty-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xs);
}

.difficulty-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge--beginner {
  background: rgba(76, 175, 125, 0.2);
  color: var(--color-success);
}

.badge--intermediate {
  background: rgba(233, 69, 96, 0.2);
  color: var(--color-accent);
}

.badge--advanced {
  background: rgba(142, 146, 164, 0.2);
  color: var(--color-muted);
}

.difficulty-card-arrow {
  font-size: 1.4rem;
  color: var(--color-muted);
}

.difficulty-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  line-height: 1.4;
  margin: 0;
}

/* Custom scenario card (dashed "create" style) */

.scenario-card--create {
  border-style: dashed;
  border-color: var(--color-muted);
  color: var(--color-muted);
}

.scenario-card--create:hover {
  border-color: var(--color-text);
  color: var(--color-text);
  background: var(--color-surface-2);
}

.scenario-card--create .scenario-card-icon {
  font-size: 1.1rem;
}

/* Saved custom scenario row (card + delete button side by side) */

.scenario-card-row {
  display: flex;
  gap: var(--space-sm);
  align-items: stretch;
}

.scenario-card-row .scenario-card {
  flex: 1;
  min-width: 0;
}

.btn-scenario-delete {
  flex-shrink: 0;
  width: var(--tap-target);
  min-width: var(--tap-target);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-muted);
  font-size: 0.875rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.btn-scenario-delete:hover {
  background: rgba(233, 69, 96, 0.1);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Custom scenario generator form */

.generate-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.generate-textarea {
  width: 100%;
  min-height: 80px;
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font: inherit;
  font-size: 1rem;
  line-height: 1.5;
  resize: vertical;
  transition: border-color 0.15s;
}

.generate-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.generate-textarea::placeholder {
  color: var(--color-muted);
}

/* "Save for later" — unobtrusive text button below the difficulty cards */

.scenarios-save-row {
  margin-top: var(--space-lg);
  text-align: center;
}

.btn-save-scenario {
  background: none;
  border: none;
  color: var(--color-muted);
  font: inherit;
  font-size: var(--font-size-sm);
  cursor: pointer;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  transition: color 0.15s;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.btn-save-scenario:hover {
  color: var(--color-text);
}

.btn-save-scenario--saved {
  color: var(--color-success);
  text-decoration: none;
  cursor: default;
  pointer-events: none;
}

/* ── Ruby / furigana ───────────────────────────────────────────────────────── */

ruby {
  ruby-align: center;
}

rt {
  font-size: 0.55em;
  color: var(--color-muted);
}

/* ── Conversation screen ───────────────────────────────────────────────────── */

.conv-screen {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 600px;
  margin: 0 auto;
}

/* Top bar */

.conv-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  flex-shrink: 0;
}

.conv-status {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-left: auto;
  margin-right: var(--space-sm);
}

.conv-scenario-label {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

.btn-end-session {
  padding: 0.35rem 0.875rem;
  min-height: var(--tap-target);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font: inherit;
  font-size: var(--font-size-xs);
  font-weight: 600;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: border-color 0.15s, color 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.btn-end-session:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Transcript */

.conv-transcript {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  scroll-behavior: smooth;
}

.transcript-entry {
  display: flex;
  gap: var(--space-sm);
  max-width: 100%;
}

.transcript-entry--ai {
  align-self: flex-start;
}

.transcript-entry--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.entry-role {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  flex-shrink: 0;
  padding-top: 3px;
  min-width: 2.5rem;
  text-align: right;
}

.transcript-entry--user .entry-role {
  text-align: left;
  color: var(--color-accent);
}

.entry-body {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  max-width: 80%;
}

.transcript-entry--user .entry-body {
  background: var(--color-surface-2);
  border-color: var(--color-surface-2);
}

.entry-text {
  font-size: var(--font-size-base);
  line-height: 1.7;
}

.entry-translation {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  margin-top: var(--space-xs);
  line-height: 1.4;
}

/* Bottom panel */

.conv-bottom {
  flex-shrink: 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* Loading dots */

.conv-loading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-muted);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) 0;
}

.loading-dots {
  display: flex;
  gap: 4px;
}

.loading-dots span {
  display: block;
  width: 7px;
  height: 7px;
  background: var(--color-muted);
  border-radius: 50%;
  animation: dot-bounce 1.2s infinite ease-in-out;
}

.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dot-bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40%           { transform: scale(1.0); opacity: 1;   }
}

/* AI utterance panel */

.conv-ai-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.conv-ai-text {
  font-size: 1.2rem;
  line-height: 1.8;
  margin-bottom: var(--space-xs);
}

.conv-ai-english {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

.conv-ai-controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.btn-replay {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.4rem 0.875rem;
  min-height: 36px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font: inherit;
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: background 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.btn-replay:hover {
  background: var(--color-border);
}

.tts-speed-toggle {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.speed-btn {
  padding: 0.4rem 0.75rem;
  min-height: 36px;
  background: var(--color-surface-2);
  border: none;
  border-right: 1px solid var(--color-border);
  color: var(--color-muted);
  font: inherit;
  font-size: var(--font-size-xs);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.speed-btn:last-child { border-right: none; }

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

/* Response cards */

.conv-response-area {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.response-card {
  width: 100%;
  padding: 0.75rem var(--space-md);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.response-card:hover {
  background: var(--color-surface-2);
  border-color: var(--color-muted);
}

.response-card:active {
  transform: scale(0.98);
}

.response-card--selected {
  border-color: var(--color-accent);
  background: var(--color-surface-2);
}

.rc-english {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.rc-romaji {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

.rc-japanese {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

/* Error row */

.conv-error-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  min-height: 1.4em;
}

.btn-retry {
  width: auto;
  min-height: 36px;
  padding: 0.4rem 1rem;
  font-size: var(--font-size-sm);
}

/* Mic area */

.conv-mic-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding-top: var(--space-xs);
}

.btn-mic {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  background: var(--color-surface-2);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
  position: relative;
}

.btn-mic:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-mic:not(:disabled):hover {
  background: var(--color-surface);
  border-color: var(--color-muted);
}

.btn-mic:not(:disabled):active {
  transform: scale(0.94);
}

.btn-mic--active {
  background: var(--color-accent) !important;
  border-color: var(--color-accent) !important;
  animation: mic-pulse 1.2s ease-in-out infinite;
}

.mic-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.mic-hint {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  text-align: center;
  min-height: 1.2em;
}

@keyframes mic-pulse {
  0%, 100% { box-shadow: 0 0 0 0   rgba(233, 69, 96, 0.5); }
  50%       { box-shadow: 0 0 0 12px rgba(233, 69, 96, 0);   }
}

/* ── Free conversation screen ──────────────────────────────────────────────── */

.free-conv-screen {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  max-width: 560px;
  margin: 0 auto;
}

.free-conv-body {
  padding: var(--space-lg);
  padding-bottom: var(--space-xl);
}

.free-conv-prompt {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
}

/* Topic chips grid */

.topic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.topic-chip {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  min-height: 56px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font: inherit;
  font-size: var(--font-size-sm);
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.topic-chip:hover {
  background: var(--color-surface-2);
  border-color: var(--color-muted);
}

.topic-chip:active {
  transform: scale(0.97);
}

.topic-chip-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

/* Divider */

.free-conv-divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  color: var(--color-muted);
  font-size: var(--font-size-sm);
}

.free-conv-divider::before,
.free-conv-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* Custom topic input row */

.free-conv-custom {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.free-conv-input {
  flex: 1;
  min-height: var(--tap-target);
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font: inherit;
  font-size: var(--font-size-base);
  transition: border-color 0.15s;
}

.free-conv-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.free-conv-input::placeholder {
  color: var(--color-muted);
}

/* ── Review screen ─────────────────────────────────────────────────────────── */

.review-screen {
  min-height: 100dvh;
  max-width: 560px;
  margin: 0 auto;
}

.review-header {
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.app-name-small {
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.review-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
}

.review-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
}

/* Stats grid */

.review-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.stat-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat-value {
  font-size: 1.05rem;
  font-weight: 600;
}

/* Review section (vocab) */

.review-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* Review nav buttons */

.review-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* Vocabulary list */

.vocab-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

.vocab-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.vocab-item-top {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.vocab-japanese {
  font-size: 1.15rem;
  font-weight: 600;
}

.vocab-furigana {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

.vocab-romaji {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  font-style: italic;
}

.vocab-english {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.vocab-example {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  line-height: 1.5;
}

/* ── Stub screens (placeholder until next sessions) ────────────────────────── */

.stub-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  gap: var(--space-md);
  padding: var(--space-xl);
  text-align: center;
}

.stub-title {
  font-size: 1.4rem;
  font-weight: 700;
}

.stub-note {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

/* ── History button (home screen) ──────────────────────────────────────────── */

.home-hist-btn {
  display: block;
  margin: var(--space-xl) auto var(--space-lg);
  padding: 0.5rem 1.5rem;
  min-height: var(--tap-target);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-muted);
  font: inherit;
  font-size: var(--font-size-sm);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s, border-color 0.15s;
}

.home-hist-btn:hover {
  color: var(--color-text);
  border-color: var(--color-muted);
}

/* ── History screen ─────────────────────────────────────────────────────────── */

.hist-screen {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

.hist-body {
  padding: var(--space-md) var(--space-lg) var(--space-xl);
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

.hist-empty {
  text-align: center;
  color: var(--color-muted);
  margin-top: var(--space-xl);
  font-size: var(--font-size-sm);
}

.hist-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hist-entry {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.hist-entry-header {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.hist-entry-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hist-scenario {
  font-weight: 600;
}

.hist-difficulty {
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  background: rgba(233, 69, 96, 0.12);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.hist-entry-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

.hist-entry-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-xs);
}

.hist-entry-actions .btn {
  min-height: 36px;
  padding: 0.4rem 0.9rem;
  font-size: var(--font-size-sm);
  flex: 1;
}

/* ── Transcript panel (expanded inside history entry) ───────────────────────── */

.hist-transcript-panel {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.hist-transcript-body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hist-no-transcript {
  color: var(--color-muted);
  font-size: var(--font-size-sm);
  text-align: center;
}

.hist-exchange {
  display: flex;
  gap: var(--space-sm);
}

.hist-ex-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-muted);
  min-width: 2.5rem;
  text-align: right;
  padding-top: 0.15rem;
  flex-shrink: 0;
}

.hist-exchange--ai .hist-ex-label {
  color: var(--color-accent);
}

.hist-ex-body {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.hist-ex-japanese {
  line-height: 1.8; /* extra room for ruby annotations */
}

.hist-ex-romaji {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  font-style: italic;
}

.hist-ex-english {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

/* ── Profile badge (home screen) ────────────────────────────────────────────── */

.profile-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 2rem;
  padding: 0.35rem 0.875rem 0.35rem 0.35rem;
  cursor: pointer;
  min-height: var(--tap-target);
  color: var(--color-text);
  font: inherit;
  transition: background 0.15s, border-color 0.15s;
  -webkit-tap-highlight-color: transparent;
  margin-bottom: var(--space-md);
}

.profile-badge:hover {
  background: var(--color-surface-2);
  border-color: var(--color-muted);
}

.profile-initials {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  background: var(--color-accent); /* default; overridden inline by JS */
}

.profile-badge-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.profile-badge-chevron {
  font-size: 0.7rem;
  color: var(--color-muted);
  margin-left: 2px;
}

/* ── Profile picker overlay + bottom sheet ───────────────────────────────────── */

.profile-picker-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 100;
  display: flex;
  align-items: flex-end;
}

.profile-picker-sheet {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.profile-picker-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.profile-picker-title {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.btn-picker-close {
  background: none;
  border: none;
  color: var(--color-muted);
  font-size: 1rem;
  cursor: pointer;
  min-height: var(--tap-target);
  min-width: var(--tap-target);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s, background 0.15s;
}

.btn-picker-close:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* ── Profile list ──────────────────────────────────────────────────────────── */

.profile-list {
  list-style: none;
  padding: var(--space-sm) 0;
}

.profile-item {
  display: flex;
  align-items: center;
  padding: 0 var(--space-md);
  min-height: var(--tap-target);
}

.profile-item-main {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: none;
  border: none;
  color: var(--color-text);
  font: inherit;
  cursor: pointer;
  text-align: left;
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  min-height: var(--tap-target);
  -webkit-tap-highlight-color: transparent;
  transition: background 0.15s;
}

.profile-item-main:hover {
  background: var(--color-surface-2);
}

.profile-item--active .profile-item-main {
  cursor: default;
}

.profile-item-name {
  flex: 1;
  font-size: var(--font-size-base);
}

.profile-item-active-badge {
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.profile-item-delete-area {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.btn-profile-delete {
  background: none;
  border: none;
  color: var(--color-muted);
  font-size: 1.1rem;
  cursor: pointer;
  min-height: var(--tap-target);
  min-width: var(--tap-target);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s;
}

.btn-profile-delete:hover {
  color: var(--color-error);
}

/* Inline delete confirmation */
.profile-delete-confirm {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  white-space: nowrap;
}

.profile-item-delete-area .btn-delete-yes,
.profile-item-delete-area .btn-delete-cancel {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font: inherit;
  font-size: var(--font-size-xs);
  font-weight: 600;
  cursor: pointer;
  min-height: 36px;
  padding: 0.25rem 0.75rem;
  transition: background 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.profile-item-delete-area .btn-delete-yes:hover {
  background: var(--color-error);
  border-color: var(--color-error);
  color: #fff;
}

.profile-item-delete-area .btn-delete-cancel:hover {
  background: var(--color-border);
}

/* ── Profile picker footer ───────────────────────────────────────────────────── */

.profile-picker-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.profile-picker-footer .btn {
  width: 100%;
}

.stub-back {
  width: auto;
  margin-top: var(--space-sm);
}