/* ==========================================================================
   Web tạo video từ kịch bản (Bản MVP) - Style Sheet
   Phong cách: Studio Minimalist (Dark Video Creator Workstation)
   Font: Be Vietnam Pro
   ========================================================================== */

@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/be-vietnam-pro-400-vietnamese.woff2') format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}

@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/be-vietnam-pro-400-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/be-vietnam-pro-500-vietnamese.woff2') format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}

@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/be-vietnam-pro-500-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/be-vietnam-pro-600-vietnamese.woff2') format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}

@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/be-vietnam-pro-600-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/be-vietnam-pro-700-vietnamese.woff2') format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}

@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/be-vietnam-pro-700-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/jetbrains-mono-500-vietnamese.woff2') format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/jetbrains-mono-500-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/jetbrains-mono-600-vietnamese.woff2') format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/jetbrains-mono-600-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}


:root {
  /* Bảng màu Dark Studio */
  --color-bg-base: #0c0e14;
  --color-bg-sidebar: #131722;
  --color-bg-card: #1b202e;
  --color-bg-card-hover: #22293b;
  --color-bg-input: #10131a;
  --color-border: #283042;
  --color-border-subtle: #1f2533;
  --color-border-active: #f59e0b;

  /* Màu chữ đạt chuẩn WCAG AA (Mọi chữ nhỏ đều >= 4.5:1) */
  --color-text-primary: #f1f5f9;   /* Độ tương phản ~14:1 trên nền tối */
  --color-text-secondary: #94a3b8; /* Độ tương phản ~5.5:1 đến 7.2:1 trên nền tối */
  --color-text-muted: #94a3b8;     /* Đã nâng sáng từ #64748b lên #94a3b8 để đạt chuẩn WCAG AA >= 4.5:1 */
  --color-text-inverse: #0f172a;

  /* Điểm nhấn thương hiệu / Visual Hook (Màu hổ phách) */
  --color-accent: #f59e0b;
  --color-accent-hover: #d97706;
  --color-accent-subtle: rgba(245, 158, 11, 0.12);
  --color-accent-glow: rgba(245, 158, 11, 0.35);

  /* Trạng thái */
  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.12);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.12);
  --color-danger: #ef4444;
  --color-danger-text: #f87171;   /* chữ cảnh báo: #ef4444 chỉ 3,87:1 trên nền cảnh báo; #f87171 đạt ≥ 4,5:1 */
  --color-danger-bg: rgba(239, 68, 68, 0.12);
  --color-info: #3b82f6;
  --color-info-bg: rgba(59, 130, 246, 0.12);

  /* Kiểu chữ */
  --font-sans: 'Be Vietnam Pro', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* Khoảng cách và bo góc */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  /* Bố cục desktop */
  --sidebar-width: 270px;
  --bottom-nav-height: 64px;
  --transition-fast: 0.18s ease;
}

/* Reset căn bản */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   Bố cục Archetype: THANH BÊN CỐ ĐỊNH (Desktop) & THANH DƯỚI (Mobile)
   ========================================================================== */

.app-layout {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* Thanh bên desktop */
.app-sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background-color: var(--color-bg-sidebar);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 30;
}

.sidebar-header {
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--color-border);
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.brand-badge svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.sidebar-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
}

.sidebar-benchmark-pill {
  margin-top: 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background-color: var(--color-accent-subtle);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
}

/* Menu điều hướng desktop: Không ngắt dòng (1 dòng) */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-weight: 500;
  white-space: nowrap; /* Không gãy dòng theo yêu cầu brief */
  transition: background-color var(--transition-fast), color var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
  min-height: 44px;
}

.nav-item:hover {
  background-color: var(--color-bg-card);
  color: var(--color-text-primary);
}

.nav-item.active {
  background-color: var(--color-bg-card);
  color: var(--color-accent);
  border-color: var(--color-border);
  font-weight: 600;
}

.nav-item-icon {
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-item-icon svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.sidebar-footer {
  padding: 14px 14px 18px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-state-selector {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sidebar-state-selector label {
  font-weight: 600;
  color: var(--color-text-primary);
}

.state-select {
  width: 100%;
  padding: 10px 12px;
  min-height: 44px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: 0.88rem;
  outline: none;
  cursor: pointer;
}

.state-select:focus {
  border-color: var(--color-accent);
}

/* ==========================================================================
   Vùng nội dung chính (Scroll độc lập)
   ========================================================================== */

.app-main {
  flex: 1;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-base);
}

/* Dải thông báo dữ liệu mẫu (Gom vào 1 dải chung theo yêu cầu brief) */
.sample-data-banner {
  background-color: #1a2233;
  border-bottom: 1px solid var(--color-border);
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.sample-data-banner-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sample-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background-color: var(--color-accent-subtle);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.sample-data-banner-text {
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* Header di động (Chỉ hiển thị trên mobile/tablet) */
.mobile-header {
  display: none;
  padding: 12px 16px;
  background-color: var(--color-bg-sidebar);
  border-bottom: 1px solid var(--color-border);
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.mobile-header-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

/* Lưới nội dung 2 cột desktop */
.content-workspace {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 24px;
  padding: 24px;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

.workspace-editor-col {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.workspace-preview-col {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sticky-preview-wrapper {
  position: sticky;
  top: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ==========================================================================
   Thẻ chứa chung (Section Card)
   ========================================================================== */

.section-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  transition: border-color var(--transition-fast);
}

.section-card:hover {
  border-color: rgba(245, 158, 11, 0.4);
}

.section-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

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

.section-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Mục 1: Nhập kịch bản
   ========================================================================== */

.script-input-wrapper {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.script-textarea {
  width: 100%;
  min-height: 130px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px;
  color: var(--color-text-primary);
  font-size: 0.95rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast);
}

.script-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-subtle);
}

.script-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.char-counter {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.char-counter strong {
  color: var(--color-text-primary);
}

/* ==========================================================================
   Nút bấm chuẩn UI
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px; /* Chuẩn 44x44px mục tiêu chạm */
  user-select: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  box-shadow: 0 2px 8px var(--color-accent-glow);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--color-bg-input);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.btn-secondary:hover {
  background-color: var(--color-bg-card-hover);
  border-color: var(--color-text-secondary);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.85rem;
  min-height: 44px;
}

.btn-danger-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-muted);
}

.btn-danger-outline:hover {
  border-color: var(--color-danger);
  color: var(--color-danger-text);
  background-color: var(--color-danger-bg);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   Mục 2: Danh sách scene
   ========================================================================== */

.duration-summary-widget {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 12px;
}

.duration-summary-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.duration-summary-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.duration-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.duration-badge.match {
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.duration-badge.warning {
  background-color: var(--color-danger-bg);
  color: var(--color-danger-text);
  border: 1px solid var(--color-danger);
}

.scene-cards-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.scene-card {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 16px;
  padding: 14px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  align-items: start;
  transition: all var(--transition-fast);
}

.scene-card:hover {
  border-color: rgba(245, 158, 11, 0.4);
}

.scene-card.active-scene {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent);
}

/* Ảnh thumbnail 9:16 của scene */
.scene-thumbnail-box {
  width: 80px;
  aspect-ratio: 9/16;
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  background-color: #181d28;
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

.scene-thumbnail-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.scene-thumbnail-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6px;
  text-align: center;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  gap: 4px;
  background: linear-gradient(180deg, #181d28 0%, #10131a 100%);
}

.scene-thumbnail-fallback svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-text-secondary);
}

.scene-order-pill {
  position: absolute;
  top: 4px;
  left: 4px;
  background-color: rgba(0, 0, 0, 0.75);
  color: var(--color-text-primary);
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.scene-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.scene-header-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.scene-title-label {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text-primary);
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 21px;
  height: 21px;
  display: inline-flex;
  align-items: center;
}

.scene-duration-selector {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.duration-select {
  padding: 8px 10px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
  min-height: 44px;
}

.duration-select:focus {
  border-color: var(--color-accent);
}

.scene-text-input {
  width: 100%;
  min-height: 98px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  color: var(--color-text-primary);
  font-size: 0.88rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
  box-sizing: border-box;
  field-sizing: content;
}

.scene-text-input:focus {
  border-color: var(--color-accent);
}

.scene-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.scene-actions-btn {
  width: 44px;
  height: 44px;
  padding: 0;
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.scene-actions-btn:hover {
  background-color: var(--color-bg-card-hover);
  color: var(--color-text-primary);
  border-color: var(--color-text-secondary);
}

.scene-actions-btn.delete-btn:hover {
  background-color: var(--color-danger-bg);
  color: var(--color-danger-text);
  border-color: var(--color-danger);
}

/* ==========================================================================
   Mục 3: Xem trước & Dòng thời gian 60 giây
   ========================================================================== */

.preview-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

/* Khung màn hình dọc 9:16 */
.video-frame-9-16 {
  width: 100%;
  max-width: 280px;
  aspect-ratio: 9/16;
  background-color: #050608;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-frame-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
  transition: opacity 0.3s ease;
}

.video-frame-media-fallback {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  background: radial-gradient(circle at center, #1b2130 0%, #0d1017 100%);
  gap: 12px;
}

.video-frame-media-fallback svg {
  width: 44px;
  height: 44px;
  stroke: var(--color-accent);
}

.video-frame-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(0,0,0,0.3) 0%, transparent 20%, transparent 70%, rgba(0,0,0,0.85) 100%);
  pointer-events: none;
}

.preview-header-tags {
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 10;
}

.preview-aspect-tag {
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.preview-sample-tag {
  background-color: rgba(245, 158, 11, 0.85);
  color: #000;
  font-weight: 700;
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Vùng hiển thị phụ đề */
.preview-subtitles-box {
  position: absolute;
  bottom: 24px;
  left: 16px;
  right: 16px;
  z-index: 10;
  text-align: center;
}

.subtitle-pill {
  display: inline-block;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.4;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
}

/* ==========================================================================
   Điểm nhấn đặc sắc: Thước đo thời gian 60 giây màu hổ phách
   (Amber 60s Timeline Strip)
   ========================================================================== */

.timeline-component {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.timeline-info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

.timeline-label {
  font-weight: 600;
  color: var(--color-text-secondary);
}

.timeline-time-display {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-accent);
}

/* Thanh thước đo thời gian */
.timeline-track-container {
  position: relative;
  width: 100%;
  padding-top: 14px;
}

.timeline-track {
  position: relative;
  height: 28px;
  background-color: #0f131c;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  overflow: hidden;
  cursor: pointer;
}

.timeline-segment {
  height: 100%;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  background-color: rgba(255, 255, 255, 0.03);
  transition: background-color var(--transition-fast);
  user-select: none;
}

.timeline-segment:hover {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent);
}

.timeline-segment.active-segment {
  background-color: rgba(245, 158, 11, 0.18);
  color: var(--color-accent);
}

/* Vạch phát (Kim thời gian) màu hổ phách phát sáng */
.timeline-playhead {
  position: absolute;
  top: 8px;
  left: 0%;
  width: 2px;
  height: 40px;
  background-color: var(--color-accent);
  box-shadow: 0 0 10px var(--color-accent-glow), 0 0 4px var(--color-accent);
  z-index: 20;
  transform: translateX(-50%);
  pointer-events: none;
  transition: left 0.1s linear;
}

.timeline-playhead::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 8px;
  background-color: var(--color-accent);
  clip-path: polygon(0% 0%, 100% 0%, 50% 100%);
}

/* Các vạch mốc thời gian (0s, 15s, 30s, 45s, 60s) */
.timeline-ruler-ticks {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  user-select: none;
}

/* Cụm nút điều khiển dòng thời gian */
.timeline-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 4px;
}

/* ==========================================================================
   Mục 4: Chọn giọng đọc và nhạc nền
   ========================================================================== */

.audio-controls-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.audio-select-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.audio-select-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.audio-choice-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.audio-select {
  flex: 1;
  padding: 10px 12px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  min-height: 44px;
}

.audio-select:focus {
  border-color: var(--color-accent);
}

/* Thanh âm lượng nhạc */
.volume-control-box {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.volume-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.volume-slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.volume-icon {
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.volume-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 44px;
  background: transparent;
  outline: none;
  cursor: pointer;
}

.volume-slider::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-border);
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 6px var(--color-accent-glow);
  cursor: pointer;
  margin-top: -8px;
  transition: transform var(--transition-fast);
}

.volume-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Sóng âm mô phỏng khi nghe thử */
.audio-audition-indicator {
  display: none;
  align-items: center;
  gap: 4px;
  height: 16px;
}

.audio-audition-indicator.playing {
  display: inline-flex;
}

.audio-wave-bar {
  width: 3px;
  height: 100%;
  background-color: var(--color-accent);
  border-radius: 1px;
  animation: wavePulse 0.8s ease-in-out infinite alternate;
}

.audio-wave-bar:nth-child(2) { animation-delay: 0.2s; }
.audio-wave-bar:nth-child(3) { animation-delay: 0.4s; }
.audio-wave-bar:nth-child(4) { animation-delay: 0.1s; }

@keyframes wavePulse {
  0% { height: 4px; }
  100% { height: 16px; }
}

/* ==========================================================================
   Mục 5: Tạo và tải video
   ========================================================================== */

.action-card-footer {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-large-action {
  width: 100%;
  padding: 14px 20px;
  font-size: 1.05rem;
  font-weight: 700;
  min-height: 48px;
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Mục 6: Khung hiển thị các trạng thái hệ thống
   (Đang xử lý / Lỗi / Vượt giới hạn / Quá ngắn / Quá dài / Hoàn thành)
   ========================================================================== */

.state-overlay-container {
  display: none;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  text-align: center;
}

.state-overlay-container.visible {
  display: flex;
}

.state-icon-circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.state-icon-circle svg {
  width: 28px;
  height: 28px;
}

.state-icon-circle.processing {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent);
}

.state-icon-circle.error {
  background-color: var(--color-danger-bg);
  color: var(--color-danger-text);
}

.state-icon-circle.warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
}

.state-icon-circle.success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.state-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.state-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  max-width: 440px;
  line-height: 1.5;
}

/* Tiến độ theo bước: Giọng đọc → Hình → Ghép → Xuất */
.step-progress-stepper {
  width: 100%;
  max-width: 480px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 14px 0 6px;
  position: relative;
}

.step-progress-stepper::before {
  content: '';
  position: absolute;
  top: 14px;
  left: 24px;
  right: 24px;
  height: 2px;
  background-color: var(--color-border);
  z-index: 1;
}

.step-node {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.step-circle {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: var(--color-bg-base);
  border: 2px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.step-node.completed .step-circle {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.step-node.active .step-circle {
  background-color: var(--color-bg-base);
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: 0 0 10px var(--color-accent-glow);
}

.step-label {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  font-weight: 600;
  white-space: nowrap;
}

.step-node.active .step-label {
  color: var(--color-accent);
}

.step-node.completed .step-label {
  color: var(--color-text-primary);
}

/* Khung cảnh báo / trạng thái trong form */
.status-alert-box {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  line-height: 1.45;
}

.status-alert-box.danger {
  background-color: var(--color-danger-bg);
  border: 1px solid var(--color-danger);
  color: #fca5a5;
}

.status-alert-box.warning {
  background-color: var(--color-warning-bg);
  border: 1px solid var(--color-warning);
  color: #fde68a;
}

.status-alert-box.info {
  background-color: var(--color-info-bg);
  border: 1px solid var(--color-info);
  color: #bfdbfe;
}

.status-alert-box svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ==========================================================================
   Thanh điều hướng dưới cùng Mobile (Bottom Navigation)
   Thuận ngón cái, mục tiêu chạm tối thiểu 44x44px
   ========================================================================== */

.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background-color: var(--color-bg-sidebar);
  border-top: 1px solid var(--color-border);
  z-index: 50;
  padding: 0 8px;
  justify-content: space-around;
  align-items: center;
}

.mobile-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  min-width: 48px;
  min-height: 48px; /* Đạt mục tiêu chạm tối thiểu 44x44px */
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.mobile-nav-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.mobile-nav-btn.active {
  color: var(--color-accent);
}

/* Thanh chuyển trạng thái nổi phục vụ kiểm thử UI/UX */
.floating-state-panel {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--color-bg-sidebar);
  border: 1px solid var(--color-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
}

.floating-state-panel label {
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
}

/* ==========================================================================
   Tối ưu co giãn theo Breakpoint
   ========================================================================== */

/* Tablet (dưới 1024px) */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 230px;
  }

  .content-workspace {
    grid-template-columns: 1fr 340px;
    gap: 18px;
    padding: 18px;
  }

  .video-frame-9-16 {
    max-width: 240px;
  }
}

/* Tablet dọc & Mobile (dưới 768px) */
@media (max-width: 768px) {
  .app-sidebar {
    display: none; /* Ẩn sidebar desktop, chuyển sang mobile navigation */
  }

  .mobile-header {
    display: flex;
  }

  .mobile-bottom-nav {
    display: flex;
  }

  .floating-state-panel {
    bottom: calc(var(--bottom-nav-height) + 12px);
    right: 12px;
    left: 12px;
    justify-content: space-between;
  }

  .app-main {
    padding-bottom: calc(var(--bottom-nav-height) + 56px); /* Chống đè lấp nội dung */
  }

  .content-workspace {
    grid-template-columns: 1fr; /* 1 cột duy nhất, không tràn ngang */
    gap: 20px;
    padding: 16px;
  }

  .sticky-preview-wrapper {
    position: static; /* Không dính trên mobile */
  }

  .video-frame-9-16 {
    max-width: 240px;
    margin: 0 auto;
  }

  .scene-card {
    grid-template-columns: 72px 1fr auto;
    gap: 12px;
    padding: 12px;
  }

  .scene-thumbnail-box {
    width: 72px;
  }

  .scene-header-line {
    flex-wrap: nowrap;
    gap: 8px;
    align-items: center;
  }

  .scene-title-label {
    white-space: nowrap;
    flex-shrink: 0;
    line-height: 21px;
    height: 21px;
    font-size: 0.92rem;
  }

  .scene-duration-selector {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
  }

  .scene-duration-selector label {
    display: none; /* Ẩn nhãn chữ trên mobile để nhãn Scene 1..6 không bị gãy 2 dòng */
  }

  .duration-select {
    padding: 6px 8px;
    min-height: 44px;
    font-size: 0.82rem;
  }

  .scene-text-input {
    min-height: 98px;
    height: auto;
  }
}

/* Mobile nhỏ (360px - 390px) */
@media (max-width: 390px) {
  .content-workspace {
    padding: 12px;
    gap: 16px;
  }

  .section-card {
    padding: 14px;
  }

  .video-frame-9-16 {
    max-width: 210px;
  }

  .scene-card {
    grid-template-columns: 60px 1fr auto;
    gap: 8px;
    padding: 10px;
  }

  .scene-thumbnail-box {
    width: 60px;
  }

  .scene-title-label {
    white-space: nowrap;
    flex-shrink: 0;
    line-height: 21px;
    height: 21px;
    font-size: 0.88rem;
  }

  .duration-select {
    padding: 4px 6px;
    font-size: 0.8rem;
    min-height: 44px;
  }

  .btn {
    padding: 8px 14px;
  }

  .sample-data-banner {
    padding: 8px 12px;
    font-size: 0.78rem;
  }
}

/* ==========================================================================
   Tôn trọng prefers-reduced-motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   Bổ sung cho bản sản phẩm
   ========================================================================== */

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.char-counter .over-limit {
  color: var(--color-danger-text);
}

.scenes-empty {
  padding: 18px 14px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  text-align: center;
}

#durationAlert {
  margin-bottom: 14px;
}

#scriptAlert {
  margin-top: 14px;
}

.duration-select[inputmode="decimal"] {
  width: 84px;
  text-align: right;
  cursor: text;
}

.timeline-segment {
  overflow: hidden;
  min-width: 0;
  white-space: nowrap;
}

.timeline-track-empty {
  cursor: default;
}

.preview-scene-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.preview-scene-time {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.preview-subtitles-box:empty {
  display: none;
}

.timeline-controls .btn[disabled],
#btnDownloadSrt[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Danh sách phụ đề theo dòng thời gian */
.cue-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 220px;
  overflow-y: auto;
  margin-top: 4px;
}

.cue-item.active-cue .cue-seek {
  border-color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

.cue-seek {
  width: 100%;
  min-height: 44px;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 10px;
  align-items: start;
  text-align: left;
  padding: 8px 10px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-primary);
  font-size: 0.85rem;
  line-height: 1.4;
}

.cue-seek:hover {
  border-color: var(--color-text-secondary);
}

.cue-time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.cue-text {
  min-width: 0;
  overflow-wrap: anywhere;
}

a.nav-item {
  text-decoration: none;
}

@media (max-width: 390px) {
  .cue-seek {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}

/* Cột xem trước không được kéo rộng cột lưới duy nhất trên màn hình hẹp */
.workspace-preview-col,
.sticky-preview-wrapper,
.section-card {
  min-width: 0;
}

@media (max-width: 768px) {
  .content-workspace {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Màn hình trung bình: cột biên tập hẹp nên bỏ nhãn chữ của ô giây (đã có aria-label) và gọn mục menu */
@media (min-width: 769px) and (max-width: 1200px) {
  .scene-duration-selector label {
    display: none;
  }

  .scene-header-line {
    flex-wrap: nowrap;
  }

  .sidebar-nav {
    padding: 16px 8px;
  }

  .nav-item {
    padding: 10px 8px;
    gap: 8px;
    font-size: 0.86rem;
  }
}

.dur-unit {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

@media (max-width: 1200px) {
  .dur-unit {
    display: inline;
  }
}

/* ==========================================================================
   Giọng đọc, hình, nhạc, xuất video
   ========================================================================== */

.scene-thumb-btn {
  padding: 0;
  cursor: pointer;
  display: block;
  color: inherit;
  font: inherit;
}

.scene-thumb-btn:hover,
.scene-thumb-btn:focus-visible {
  border-color: var(--color-accent);
  outline: none;
}

.scene-thumb-btn .scene-thumbnail-img {
  width: 100%;
  height: 100%;
}

.volume-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-text-primary);
}

.volume-header label {
  color: var(--color-text-secondary);
}

.turnstile-box {
  margin-bottom: 14px;
  min-height: 65px;
  max-width: 100%;
  overflow: hidden;
}

.btn-success,
.btn-success:hover {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: var(--color-text-inverse);
  text-decoration: none;
}

.result-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 16px;
}

.result-video {
  width: 100%;
  max-width: 280px;
  aspect-ratio: 9 / 16;
  margin: 0 auto;
  background-color: #050608;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  object-fit: contain;
}

.state-overlay-container {
  margin-top: 16px;
}

.state-overlay-container[data-kind="error"] .state-title,
.state-overlay-container[data-kind="limit"] .state-title {
  color: var(--color-danger-text);
}

.state-overlay-container[data-kind="success"] .state-title {
  color: var(--color-success);
}

.sticky-preview-wrapper {
  max-height: calc(100vh - 48px);
  overflow-y: auto;
}

.image-dialog {
  width: min(560px, calc(100vw - 24px));
  max-height: calc(100vh - 24px);
  background-color: var(--color-bg-card);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 18px;
  overflow-y: auto;
}

.image-dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.7);
}

.image-dialog[open] {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.image-choice {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-primary);
  min-height: 44px;
  text-align: center;
}

.image-choice img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  border-radius: 4px;
  display: block;
}

.image-choice.selected,
.image-choice:hover,
.image-choice:focus-visible {
  border-color: var(--color-accent);
  outline: none;
}

.image-choice-label {
  font-size: 0.75rem;
  line-height: 1.3;
  color: var(--color-text-secondary);
}

@media (max-width: 390px) {
  .image-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ----- Sửa lỗi: focus bàn phím cho thanh âm lượng, Firefox, không tràn ở 320px ----- */
.volume-slider:focus-visible {
  outline: none;
}

.volume-slider:focus-visible::-webkit-slider-thumb {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  transform: scale(1.1);
}

.volume-slider::-moz-range-track {
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-border);
}

.volume-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 6px var(--color-accent-glow);
  cursor: pointer;
}

.volume-slider:focus-visible::-moz-range-thumb {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.audio-choice-row {
  min-width: 0;
}

.audio-select {
  min-width: 0;
  max-width: 100%;
  width: 100%;
}

/* 320px: thẻ scene gọn hơn để không tràn/chồng lấn */
@media (max-width: 340px) {
  .scene-card {
    grid-template-columns: 48px minmax(0, 1fr) 44px;
    gap: 6px;
    padding: 8px;
  }

  .scene-thumbnail-box {
    width: 48px;
  }

  .scene-header-line {
    gap: 4px;
  }

  .duration-select[inputmode="decimal"] {
    width: 60px;
    padding: 4px 6px;
  }

  .dur-unit {
    display: none;
  }

  .duration-summary-widget {
    flex-wrap: wrap;
    gap: 8px;
  }
}