/* ==========================================================================
   App shell styles — warm travel theme, mobile-first.
   Primary: #c05621 (warm orange / terracotta)
   ========================================================================== */

:root {
  --color-primary: #c05621;
  --color-primary-light: #dd6b20;
  --color-primary-dark: #9c4221;
  --color-primary-soft: #fbe9dd;

  --color-bg: #fdf6f0;
  --color-surface: #ffffff;
  --color-surface-alt: #fbf1e8;
  --color-text: #2d2a26;
  --color-text-muted: #6e655c;
  --color-border: #eadfd6;
  --color-danger: #c53030;

  --shadow-card: 0 2px 10px rgba(157, 66, 33, 0.08);
  --shadow-tabbar: 0 -2px 12px rgba(157, 66, 33, 0.10);

  --radius: 16px;
  --radius-sm: 12px;

  --tap-target: 48px;
  --font-size-base: 16px;
  --tabbar-height: 60px;
}

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

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

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang HK",
    "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

button {
  color: inherit;
}

/* ==========================================================================
   Layout: single column & fixed bottom tab bar
   ========================================================================== */

#app {
  min-height: 100vh;
  padding-bottom: calc(var(--tabbar-height) + env(safe-area-inset-bottom, 0px));
}

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 16px calc(var(--tabbar-height) + 24px);
}

/* ==========================================================================
   Header
   ========================================================================== */

.app-header {
  padding: 20px 16px 8px;
  text-align: center;
}

.app-header h1 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--color-primary-dark);
  letter-spacing: 0.02em;
}

.app-header p {
  margin: 4px 0 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 20px;
  margin-bottom: 16px;
}

.card-title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: var(--color-primary-dark);
}

.card-body {
  margin: 0;
  color: var(--color-text-muted);
}

/* Stub / under-construction note */
.stub {
  display: inline-block;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.85rem;
  font-weight: 600;
}

/* ==========================================================================
   Buttons & inputs (large tap targets)
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--tap-target);
  padding: 0 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  background: var(--color-primary);
  color: #fff;
  transition: background-color 0.15s ease, transform 0.05s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary-dark);
  border: 1px solid var(--color-border);
}

.btn-blue {
  background: #2b6cb0;
}

.btn-green {
  background: #2f855a;
}

.error {
  color: var(--color-danger);
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.input {
  width: 100%;
  min-height: var(--tap-target);
  padding: 0 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
}

.input:focus {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 1px;
  border-color: var(--color-primary-light);
}

[hidden] {
  display: none !important;
}

.auth-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  padding: 4px;
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
}

.auth-tab {
  flex: 1 1 0;
  min-height: 40px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--color-text-muted);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.auth-tab.is-active {
  background: var(--color-surface);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-card);
}

/* ==========================================================================
   Bottom tab bar
   ========================================================================== */

.tabbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  display: flex;
  align-items: stretch;
  height: calc(var(--tabbar-height) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow-tabbar);
}

.tab {
  flex: 1 1 0;
  min-height: var(--tap-target);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.7rem;
  -webkit-tap-highlight-color: transparent;
}

.tab-icon {
  font-size: 1.35rem;
  line-height: 1;
}

.tab-label {
  line-height: 1;
}

.tab.active {
  color: var(--color-primary);
  font-weight: 600;
}

/* ==========================================================================
   Utility
   ========================================================================== */

.center {
  text-align: center;
}

.muted {
  color: var(--color-text-muted);
}

.stack > * + * {
  margin-top: 16px;
}

/* ==========================================================================
   Dashboard (home view)
   ========================================================================== */

.card-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.card-link:active {
  transform: translateY(1px);
}

.goal-label {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.goal-lesson {
  margin: 4px 0 14px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
}

.progress-track {
  height: 10px;
  background: var(--color-primary-soft);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.progress-row {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.streak-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.cta {
  font-size: 1.15rem;
  box-shadow: var(--shadow-card);
}

/* ==========================================================================
   Lesson (Task 12)
   ========================================================================== */

.lesson-progress {
  margin: 4px 0 16px;
}

.lesson-progress .progress-track {
  margin-bottom: 0;
}

.lesson-es {
  margin: 8px 0 4px;
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-text);
}

.lesson-zh {
  margin: 0 0 18px;
  font-size: 1rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Lesson word breakdown
   ========================================================================== */

.word-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 4px 0 14px;
}

.word-chip {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.word-es {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-primary-dark);
}

.word-zh {
  font-size: 0.95rem;
  color: var(--color-text);
}

.word-gram {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.word-text {
  margin: 4px 0 0;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

.word-text summary {
  cursor: pointer;
  padding: 8px 12px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  list-style: none;
}

.word-text summary::-webkit-details-marker {
  display: none;
}

.word-text[open] summary {
  border-bottom: 1px dashed var(--color-border);
  color: var(--color-text);
}

.word-text p {
  margin: 0;
  padding: 10px 12px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text);
}

/* ==========================================================================
   Review (Task 13) — spaced-repetition flip card + grade buttons
   ========================================================================== */

.review-flip {
  perspective: 1000px;
  margin-bottom: 16px;
}

.review-flip-inner {
  position: relative;
  width: 100%;
  min-height: 180px;
  transform-style: preserve-3d;
  transition: transform 0.45s ease;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.review-flip-inner.flipped {
  transform: rotateY(180deg);
}

.review-flip-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px;
  text-align: center;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.review-flip-back {
  transform: rotateY(180deg);
}

.review-es {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.3;
}

.review-zh {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}

.review-hint {
  margin: 0;
  font-size: 0.85rem;
}

.review-audio {
  margin-bottom: 16px;
}

.review-grades {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.grade-btn {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-height: 88px;
  padding: 10px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: pointer;
  transition: transform 0.05s ease, background-color 0.15s ease;
}

.grade-btn:active {
  transform: translateY(1px);
}

.grade-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.grade-emoji {
  font-size: 1.9rem;
  line-height: 1;
}

.grade-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.grade-again .grade-label {
  color: var(--color-danger);
}

.grade-good .grade-label {
  color: var(--color-primary);
}

.grade-easy .grade-label {
  color: #2f855a;
}

/* ==========================================================================
   Podcast (Task 14) — listening player, subtitles, sleep timer
   ========================================================================== */

.podcast-player {
  text-align: center;
}

.podcast-art {
  font-size: 3rem;
  line-height: 1;
  margin-bottom: 8px;
}

.podcast-title {
  margin: 0 0 4px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.podcast-sub {
  margin: 0 0 14px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.podcast-play-wrap {
  display: flex;
  justify-content: center;
  margin: 18px 0 4px;
}

.podcast-play {
  width: 78px;
  height: 78px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.9rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: transform 0.05s ease, background-color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
}

.podcast-play:active {
  transform: translateY(1px);
}

.podcast-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 18px;
}

.podcast-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.podcast-chip {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.podcast-chip.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.podcast-sleep-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.podcast-sleep-cancel {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.podcast-sleep-remaining {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.podcast-lines {
  margin-top: 4px;
}

.podcast-line {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  margin-bottom: 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.podcast-line.active {
  background: var(--color-primary-soft);
  border-color: var(--color-primary-light);
}

.podcast-line-num {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-size: 0.8rem;
  font-weight: 700;
}

.podcast-line.active .podcast-line-num {
  background: var(--color-primary);
  color: #fff;
}

.podcast-line-text {
  flex: 1 1 auto;
  min-width: 0;
}

.podcast-es {
  margin: 0 0 4px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.35;
}

.podcast-zh {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.podcast-line.active .podcast-es {
  color: var(--color-primary-dark);
}

.podcast-line.active .podcast-zh {
  color: var(--color-primary-dark);
}

/* ==========================================================================
   Progress view (Task 15) — per-unit completion rows
   ========================================================================== */

.unit-item {
  margin-top: 14px;
}

.unit-item:first-child {
  margin-top: 4px;
}

.unit-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.unit-row .unit-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ==========================================================================
   Theme toggle (Task 15) — fixed 🌙 / ☀️ button, present on every view
   ========================================================================== */

.theme-toggle {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 30;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  line-height: 1;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  box-shadow: var(--shadow-card);
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

/* ==========================================================================
   Course map (levels 1 → 6)
   ========================================================================== */

.course-intro .progress-track {
  margin-top: 12px;
}

.level-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 16px;
}

.level-card {
  padding: 16px;
  border-left: 4px solid var(--level-color, var(--color-primary));
}

.level-a1 { --level-color: #2f855a; }
.level-a2 { --level-color: #2c7a7b; }
.level-b1 { --level-color: #96601a; }
.level-b2 { --level-color: #c05621; }
.level-c1 { --level-color: #c53030; }
.level-c2 { --level-color: #6b46c1; }

.level-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.level-code {
  flex: 0 0 auto;
  min-width: 44px;
  height: 44px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--level-color, var(--color-primary));
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.level-head-text {
  flex: 1 1 auto;
  min-width: 0;
}

.level-name {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
}

.level-tier {
  margin: 2px 0 0;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.level-count {
  flex: 0 0 auto;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.level-card .progress-track {
  margin-top: 12px;
}

.level-cap {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--color-text);
}

.level-exam {
  margin: 8px 0 0;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--color-text-muted);
}

.level-exam-label {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-size: 0.72rem;
  font-weight: 600;
}

.level-units {
  margin-top: 12px;
  border-top: 1px dashed var(--color-border);
}

.unit-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.unit-link:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.unit-link:active {
  opacity: 0.7;
}

.unit-link-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.unit-link-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.unit-link-meta {
  margin-top: 2px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.unit-link-go {
  flex: 0 0 auto;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  white-space: nowrap;
}

.level-planned {
  margin-top: 12px;
}

.planned-label {
  margin: 0 0 6px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.planned-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.planned-chip {
  padding: 4px 9px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

.review-shortcut {
  margin-top: 16px;
}

.level-pill {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--level-color, var(--color-primary));
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 700;
  vertical-align: middle;
}

/* ==========================================================================
   Listen mode — whole-lesson continuous audio + sleep timer
   ========================================================================== */

.listen-cta {
  margin-bottom: 14px;
}

.listen-player {
  text-align: center;
}

.listen-kicker {
  margin: 0 0 6px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-primary);
}

.listen-title {
  margin: 0 0 4px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.listen-sub {
  margin: 0 0 18px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.listen-seek-wrap {
  position: relative;
  height: 28px;
  margin-bottom: 6px;
}

.listen-progress {
  position: absolute;
  top: 11px;
  left: 0;
  right: 0;
  margin: 0;
}

.listen-seek {
  -webkit-appearance: none;
  appearance: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 28px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

.listen-seek::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: transparent;
}

.listen-seek::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-surface);
  box-shadow: 0 1px 4px rgba(157, 66, 33, 0.3);
}

.listen-seek::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: transparent;
}

.listen-seek::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-surface);
}

.listen-time {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  color: var(--color-text-muted);
}

.listen-main-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  margin: 18px 0 6px;
}

.listen-skip {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-primary-dark);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.listen-play {
  width: 86px;
  height: 86px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: #ffffff;
  font-size: 2rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.05s ease;
}

.listen-play:active {
  transform: translateY(1px);
}

.listen-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  align-items: center;
  margin-top: 12px;
}

.listen-chip-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.listen-chip {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.listen-chip.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.listen-chip:disabled {
  opacity: 0.6;
  cursor: default;
}

.listen-chip-danger {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.listen-sleep-remaining {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  font-variant-numeric: tabular-nums;
}

.listen-status {
  min-height: 1.2em;
  margin: 14px 0 0;
  font-size: 0.85rem;
}

.listen-skip-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.listen-skip-row .btn {
  flex: 1 1 0;
}

.listen-note {
  margin-top: 16px;
  background: var(--color-surface-alt);
}

.listen-transcript {
  margin-top: 8px;
}

.listen-section {
  margin-bottom: 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.listen-section summary {
  padding: 14px 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
  cursor: pointer;
  list-style: none;
}

.listen-section summary::-webkit-details-marker {
  display: none;
}

.listen-section summary::before {
  content: "▸ ";
  color: var(--color-primary);
}

.listen-section[open] summary::before {
  content: "▾ ";
}

.listen-body {
  margin: 0;
  padding: 0 16px 14px;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-text);
}

.listen-example {
  margin: 0 16px 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

.listen-es {
  margin: 0 0 3px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.listen-zh {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.listen-vocab {
  padding: 0 16px 14px;
}

.listen-vocab-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px solid var(--color-border);
}

.listen-vocab-row:last-child {
  border-bottom: none;
}

.listen-vocab-es {
  font-weight: 600;
  color: var(--color-text);
}

.listen-vocab-zh {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-align: right;
}

.listen-intro {
  background: var(--color-primary-soft);
}

.listen-unit {
  padding: 0;
  overflow: hidden;
}

.listen-unit-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
}

.listen-unit-title {
  font-weight: 700;
  color: var(--color-primary-dark);
}

.listen-lesson-list {
  display: flex;
  flex-direction: column;
}

.listen-lesson-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--tap-target);
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  -webkit-tap-highlight-color: transparent;
}

.listen-lesson-row:last-child {
  border-bottom: none;
}

.listen-lesson-row:active {
  background: var(--color-primary-soft);
}

.listen-lesson-title {
  font-size: 0.95rem;
  font-weight: 600;
}

.listen-lesson-meta {
  flex: 0 0 auto;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   Today tab, unit accordion and practice hub (UI reorganisation)
   ========================================================================== */

.listen-hero {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  padding: 20px;
}

.listen-hero-kicker {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-primary-dark);
  text-transform: uppercase;
}

.listen-hero-title {
  margin: 6px 0 4px;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

.listen-hero-meta {
  margin: 0 0 16px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-text-muted);
}

.listen-hero-play {
  min-height: 56px;
  font-size: 1.05rem;
}

.listen-hero-text {
  margin-top: 10px;
  background: transparent;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 12px 0 8px;
}

.stat {
  padding: 12px 6px;
  text-align: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
}

.stat strong {
  display: block;
  font-size: 1.3rem;
  line-height: 1.2;
  color: var(--color-primary-dark);
}

.stat span {
  display: block;
  margin-top: 2px;
  font-size: 0.76rem;
  color: var(--color-text-muted);
}

.daily-note {
  margin: 4px 0 16px;
  text-align: center;
  font-size: 0.84rem;
  color: var(--color-text-muted);
}

.weekend-card {
  background: var(--color-surface-alt);
}

.btn-sm {
  min-height: 40px;
  padding: 0 14px;
  font-size: 0.9rem;
}

/* ---- unit block (course tab) -------------------------------------------- */

.unit-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.unit-head-text {
  min-width: 0;
  flex: 1 1 auto;
}

.unit-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.unit-meta {
  margin: 2px 0 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.unit-listen {
  flex: none;
}

.unit-more {
  margin-top: 8px;
}

.unit-more summary {
  padding: 6px 0;
  font-size: 0.85rem;
  color: var(--color-primary-dark);
  cursor: pointer;
  list-style: none;
}

.unit-more summary::-webkit-details-marker {
  display: none;
}

.unit-more summary::before {
  content: "▸ ";
}

.unit-more[open] summary::before {
  content: "▾ ";
}

.lesson-list {
  border-top: 1px solid var(--color-border);
}

.lesson-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.lesson-row:last-child {
  border-bottom: 0;
}

.lesson-num {
  flex: none;
  width: 22px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.lesson-row.done .lesson-num {
  color: var(--color-primary-dark);
  font-weight: 700;
}

.lesson-name {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.92rem;
  color: var(--color-text);
  text-decoration: none;
}

.lesson-play {
  flex: none;
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-primary);
  color: #ffffff;
  font-size: 0.78rem;
  text-decoration: none;
}

.unit-materials {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.unit-materials a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.85rem;
  text-decoration: none;
}

.unit-materials a:active {
  background: var(--color-primary-soft);
}

/* ---- practice hub ------------------------------------------------------- */

.quiz-units summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.quiz-units summary::-webkit-details-marker {
  display: none;
}

.quiz-units summary::before {
  content: "▸ ";
}

.quiz-units[open] summary::before {
  content: "▾ ";
}