:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #e0e7ff;
  --secondary: #64748b;
  --secondary-hover: #475569;
  --success: #16a34a;
  --success-hover: #15803d;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang HK", "Noto Sans HK", "Microsoft JhengHei", sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  overflow-x: hidden;
  line-height: 1.5;
  min-height: 100vh;
  padding-bottom: 30px;
}

.app-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 12px 16px;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0 16px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 16px;
}

.header-content {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 2.2rem;
}

h1 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 2px;
}

.subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.btn-install {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px 18px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--text-main);
}

.subsection-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 18px 0 10px;
  color: #334155;
  border-left: 4px solid var(--primary);
  padding-left: 8px;
}

.step-badge {
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
}

.section-header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

/* Input Area */
.form-group textarea {
  width: 100%;
  min-height: 140px;
  padding: 12px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  font-size: 1rem;
  line-height: 1.6;
  font-family: inherit;
  resize: vertical;
  outline: none;
}

.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.sample-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

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

.btn-chip {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  padding: 5px 12px;
  border-radius: 16px;
  font-size: 0.82rem;
  cursor: pointer;
  color: #334155;
  font-weight: 500;
}

.btn-chip:hover {
  background: #e2e8f0;
}

.btn-chip.text-danger {
  color: var(--danger);
  border-color: #fca5a5;
  background: #fef2f2;
}

/* Bilingual (ZH + EN) labels inside buttons */
.btn-en {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  opacity: 0.85;
  line-height: 1.2;
}

.btn-en-inline {
  font-size: 0.85em;
  font-weight: 500;
  opacity: 0.85;
  margin-left: 4px;
}

/* Settings Grid */
.settings-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 14px;
}

@media (max-width: 580px) {
  .settings-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
}

.setting-item label {
  font-size: 0.88rem;
  font-weight: 600;
  color: #334155;
  overflow-wrap: anywhere;
}

.setting-item select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  background-color: #fff;
  outline: none;
  text-overflow: ellipsis;
}

.label-with-val {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 8px;
  min-width: 0;
}

.val-badge {
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 700;
}

input[type="range"] {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  accent-color: var(--primary);
  cursor: pointer;
  margin: 4px 0;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
  gap: 4px;
  overflow: hidden;
}

.range-labels span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* Toggles */
.toggles-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 14px 0 18px;
}

@media (max-width: 580px) {
  .toggles-grid {
    grid-template-columns: 1fr;
  }
}

.toggle-card {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  background: #fafafa;
}

.toggle-card:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.toggle-card input[type="checkbox"] {
  margin-top: 3px;
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.toggle-body strong {
  display: block;
  font-size: 0.9rem;
  color: var(--text-main);
}

.toggle-body p {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Buttons */
button {
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 13px 20px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  box-shadow: 0 4px 6px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: #f1f5f9;
  color: #334155;
  border: 1.5px solid #cbd5e1;
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.88rem;
}

.btn-secondary:hover {
  background: #e2e8f0;
}

.btn-success {
  background: var(--success);
  color: #fff;
  border: none;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
}

.btn-success:hover {
  background: var(--success-hover);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: 8px;
}

.btn-danger:hover {
  background: var(--danger-hover);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.8rem;
}

.full-width {
  width: 100%;
}

.hidden {
  display: none !important;
}

/* Alerts */
.info-alert {
  background: #eff6ff;
  border-left: 4px solid #3b82f6;
  color: #1e40af;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  margin-bottom: 16px;
  line-height: 1.5;
}

.badge-tag {
  background: #dbeafe;
  color: #1d4ed8;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}
/* Phrases List in Customization */
.phrases-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 18px;
  max-height: 480px;
  overflow-y: auto;
  padding-right: 4px;
}

.phrase-item {
  display: flex;
  flex-direction: column;
  background: #f8fafc;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  gap: 8px;
}

.phrase-item.paragraph-start {
  border-top: 3px solid var(--primary);
  background: #fafbff;
}

.phrase-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.phrase-index {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--primary);
}

.paragraph-tag {
  background: #ede9fe;
  color: #6d28d9;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

.phrase-item-content {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.phrase-textarea {
  flex: 1;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
  min-height: 42px;
  background: #fff;
  outline: none;
}

.phrase-textarea:focus {
  border-color: var(--primary);
}

.phrase-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}

.phrase-btn-sm {
  background: #fff;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.75rem;
  color: #475569;
  cursor: pointer;
}

.phrase-btn-sm:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
}

.phrase-btn-sm.btn-del {
  color: var(--danger);
  border-color: #fecaca;
}

.phrase-btn-sm.btn-del:hover {
  background: #fee2e2;
}

.customize-actions {
  display: flex;
  gap: 10px;
  justify-content: space-between;
  flex-wrap: wrap;
}

.customize-actions button {
  flex: 1 1 140px;
  min-width: 0;
}

/* Player Tools（學生自控隱藏文字 + 快速語速） */
.player-tools {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.player-tools .btn-chip.mask-on {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.player-speed {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #334155;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 6px 12px;
}

.player-speed input[type="range"] {
  width: 110px;
  margin: 0;
}

/* 自訂短句摺疊 */
.header-btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.customize-body.collapsed {
  display: none;
}

.customize-section.is-collapsed {
  padding-bottom: 14px;
}

.masked-text {
  letter-spacing: 3px;
}

/* 隱藏文字時遮蔽輸入框/編輯框內容（保留真實內容供編輯） */
.masked-text-target {
  filter: blur(7px);
  -webkit-filter: blur(7px);
  user-select: none;
  -webkit-user-select: none;
  caret-color: transparent;
}

/* Player Section */
.progress-bar-wrap {
  width: 100%;
  height: 8px;
  background: #e2e8f0;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #4f46e5, #06b6d4);
  transition: width 0.3s ease;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.current-speech-box {
  background: #f1f5f9;
  border-radius: 12px;
  padding: 24px 18px;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  text-align: center;
  border: 2px dashed #cbd5e1;
  margin-bottom: 20px;
}

.box-badge {
  position: absolute;
  top: 10px;
  left: 12px;
  font-size: 0.78rem;
  background: #e2e8f0;
  padding: 2px 10px;
  border-radius: 12px;
  color: #475569;
  font-weight: 600;
}

.current-text {
  font-size: 1.35rem;
  font-weight: 700;
  color: #0f172a;
  line-height: 1.6;
  margin: 12px 0;
  max-width: 90%;
}

.countdown-tag {
  background: #fef3c7;
  color: #92400e;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.95rem;
  font-weight: 700;
  border: 1px solid #fde68a;
}

.repeat-tag {
  margin-top: 6px;
  font-size: 0.82rem;
  color: #6366f1;
  font-weight: 600;
}

.player-controls {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.btn-ctrl {
  background: #fff;
  border: 1.5px solid #cbd5e1;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #334155;
  min-width: 78px;
}

.btn-ctrl:hover {
  background: #f8fafc;
  border-color: #94a3b8;
}

.btn-main-ctrl {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  min-width: 105px;
  font-size: 1.05rem;
}

.btn-main-ctrl:hover {
  background: var(--primary-hover);
}

.btn-ctrl.btn-danger {
  background: #fee2e2;
  color: var(--danger);
  border-color: #fca5a5;
}

.btn-ctrl.btn-danger:hover {
  background: var(--danger);
  color: #fff;
}

/* Full Text Summary */
.text-preview-drawer {
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  background: #fafafa;
}

.text-preview-drawer summary {
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  color: #475569;
}

.summary-list {
  margin-top: 10px;
  max-height: 200px;
  overflow-y: auto;
  font-size: 0.88rem;
}

.summary-item {
  padding: 6px 8px;
  border-bottom: 1px dashed #e2e8f0;
  cursor: pointer;
  border-radius: 4px;
}

.summary-item:hover {
  background: #f1f5f9;
}

.summary-item.active {
  background: #e0e7ff;
  color: var(--primary);
  font-weight: 700;
}

.app-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-top: 24px;
}