@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

:root {
  --bg-primary: #07090e;
  --bg-secondary: #0d121f;
  --bg-surface: rgba(18, 26, 43, 0.7);
  --bg-surface-elevated: rgba(26, 38, 64, 0.85);
  --bg-input: rgba(15, 23, 42, 0.8);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.3);
  --border-focus: rgba(6, 182, 212, 0.6);

  --accent-cyan: #06b6d4;
  --accent-violet: #8b5cf6;
  --accent-indigo: #6366f1;
  --accent-rose: #f43f5e;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;

  --gradient-brand: linear-gradient(135deg, #06b6d4 0%, #6366f1 50%, #8b5cf6 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.18) 0%, transparent 70%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 36px -8px rgba(0, 0, 0, 0.5), 0 0 24px rgba(99, 102, 241, 0.15);
  --shadow-glow: 0 0 35px rgba(6, 182, 212, 0.3);

  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
  background-image: 
    radial-gradient(ellipse at 50% -20%, rgba(99, 102, 241, 0.22) 0%, transparent 60%),
    radial-gradient(circle at 10% 40%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 70%, rgba(139, 92, 246, 0.09) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Glassmorphism panel helper */
.glass-panel {
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.glass-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
  pointer-events: none;
}

/* App Container */
.app-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 32px 24px calc(80px + env(safe-area-inset-bottom, 0px));
  padding-left: calc(24px + env(safe-area-inset-left, 0px));
  padding-right: calc(24px + env(safe-area-inset-right, 0px));
}

/* Header & Hero */
.app-header {
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.header-badges-row {
  display: flex;
  justify-content: center;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: #a5b4fc;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.2);
}

.brand-badge-custom {
  background: rgba(139, 92, 246, 0.15) !important;
  border-color: rgba(139, 92, 246, 0.4) !important;
  color: #c4b5fd !important;
}

.brand-badge .pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulse 2s infinite;
}

.server-config-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.server-config-btn:hover {
  background: rgba(6, 182, 212, 0.15);
  border-color: rgba(6, 182, 212, 0.4);
  color: var(--accent-cyan);
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.3); }
}

.main-title {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.sub-title {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto;
  font-weight: 400;
}

/* URL Input Section */
.search-card {
  padding: 24px;
  margin-bottom: 30px;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.search-card:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.6), 0 0 30px rgba(6, 182, 212, 0.15);
}

.input-group {
  display: flex;
  gap: 12px;
  align-items: center;
}

.input-field-wrapper {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  width: 100%;
}

.input-icon-wrapper {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  pointer-events: none;
  transition: color var(--transition-fast);
  z-index: 1;
}

.input-field-wrapper:focus-within .input-icon-wrapper {
  color: var(--accent-cyan);
}

.url-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 95px 16px 52px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
  -webkit-appearance: none;
}

.url-input::placeholder {
  color: var(--text-dim);
}

.url-input:focus {
  border-color: var(--border-focus);
  background: rgba(15, 23, 42, 0.95);
}

.paste-btn {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
  z-index: 2;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.paste-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.25);
}

.paste-btn:active {
  transform: translateY(-50%) scale(0.96);
}

.btn-fetch {
  background: var(--gradient-brand);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 16px 28px;
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.3);
  transition: all var(--transition-fast);
}

.btn-fetch:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.45);
}

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

.btn-fetch:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Quick Samples */
.quick-samples {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.quick-samples-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.samples-scroll-row {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 3px 0;
}

.samples-scroll-row::-webkit-scrollbar {
  display: none;
}

.sample-chip {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.sample-chip:hover {
  background: rgba(6, 182, 212, 0.15);
  border-color: rgba(6, 182, 212, 0.4);
  color: var(--accent-cyan);
}

/* Video Card (Loaded State) */
.video-card {
  padding: 24px;
  margin-bottom: 28px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: center;
  animation: fadeIn 0.4s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.video-thumb-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.video-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-thumb-container:hover .video-thumb {
  transform: scale(1.04);
}

.video-duration-badge {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
  color: #fff;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.video-details {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.video-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Quality Picker */
.quality-section {
  margin-top: 6px;
}

.quality-label {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 8px;
}

.quality-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.quality-pill {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 7px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quality-pill:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}

.quality-pill.active {
  background: rgba(6, 182, 212, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 14px rgba(6, 182, 212, 0.25);
}

/* Split Configuration Card */
.split-config-card {
  padding: 28px;
  margin-bottom: 30px;
  animation: fadeIn 0.4s ease forwards;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
}

.section-heading h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.mode-tabs {
  display: flex;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 4px;
  gap: 4px;
  margin-bottom: 24px;
}

.mode-tab {
  flex: 1;
  padding: 10px 16px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.mode-tab:hover {
  color: var(--text-primary);
}

.mode-tab.active {
  background: var(--bg-surface-elevated);
  color: var(--accent-cyan);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Preset durations */
.preset-durations {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  overflow: hidden;
}

.preset-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.presets-scroll-row {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 4px 0;
}

.presets-scroll-row::-webkit-scrollbar {
  display: none;
}

.preset-chip {
  white-space: nowrap;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.preset-chip:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.preset-chip.active {
  background: rgba(139, 92, 246, 0.2);
  border-color: var(--accent-violet);
  color: #c4b5fd;
  box-shadow: 0 0 12px rgba(139, 92, 246, 0.25);
}

/* Input rows for settings */
.split-input-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.input-field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-field-group label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.styled-number-input {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: all var(--transition-fast);
}

.styled-number-input:focus {
  border-color: var(--border-focus);
}

/* Visual Timeline Bar */
.timeline-container {
  background: rgba(10, 15, 26, 0.9);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 28px;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.timeline-title {
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.timeline-stats {
  color: var(--accent-cyan);
  font-weight: 600;
}

.timeline-track-wrapper {
  position: relative;
  padding: 10px 0;
}

.timeline-track {
  height: 38px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  display: flex;
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.timeline-segment-block {
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.76rem;
  font-weight: 700;
  color: #fff;
  border-right: 1px solid rgba(0, 0, 0, 0.4);
  cursor: pointer;
  user-select: none;
  transition: filter var(--transition-fast), transform var(--transition-fast);
}

.timeline-segment-block:hover {
  filter: brightness(1.25);
  z-index: 2;
}

.timeline-segment-block.highlighted {
  filter: brightness(1.35);
  box-shadow: inset 0 0 0 2px #fff;
}

.segment-label {
  padding: 0 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
}

.timeline-time-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: monospace;
}

/* Process Button */
.btn-process {
  width: 100%;
  background: var(--gradient-brand);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 18px 24px;
  font-family: 'Outfit', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.35);
  transition: all var(--transition-fast);
}

.btn-process:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(99, 102, 241, 0.45);
}

.btn-process:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Progress Tracker Section */
.progress-card {
  padding: 28px;
  margin-bottom: 30px;
  animation: fadeIn 0.4s ease forwards;
}

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

.progress-stage-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.progress-percent-val {
  font-size: 1.25rem;
  font-weight: 800;
  font-family: 'Outfit', sans-serif;
  color: var(--accent-cyan);
}

.progress-bar-bg {
  width: 100%;
  height: 12px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
  margin-bottom: 14px;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.progress-meta-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Results Grid Section */
.results-card {
  padding: 28px;
  margin-bottom: 40px;
  animation: fadeIn 0.5s ease forwards;
}

.results-header-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

.results-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-zip-download {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 12px 22px;
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.35);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-zip-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.45);
}

/* Parts Grid */
.parts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.part-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.part-card:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: 0 12px 24px -6px rgba(0, 0, 0, 0.5), 0 0 20px rgba(99, 102, 241, 0.15);
}

.part-thumb-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
}

.part-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.part-audio-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, #1e1b4b 0%, #0f172a 100%);
  color: #a5b4fc;
}

.part-badge-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.04em;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.part-duration-tag {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
}

.part-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
  justify-content: space-between;
}

.part-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.part-timestamp-info {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.part-actions {
  display: flex;
  gap: 8px;
  margin-top: auto;
}

.btn-part-preview {
  flex: 1;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.btn-part-preview:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-part-download {
  flex: 1;
  background: var(--gradient-brand);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-part-download:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

/* Video Preview Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 800px;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  transform: scale(0.95);
  transition: transform 0.25s ease;
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.modal-player-container {
  width: 100%;
  background: #000;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-player-container video {
  width: 100%;
  height: 100%;
  outline: none;
}

.modal-player-container audio {
  width: 80%;
}

/* Toast Notification */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: rgba(26, 38, 64, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  color: #fff;
  font-size: 0.9rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 12px;
  animation: slideInRight 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.toast.toast-error {
  border-left: 4px solid var(--accent-rose);
}

.toast.toast-success {
  border-left: 4px solid var(--accent-emerald);
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Spinner helper */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Responsive UI / UX Tweaks */
@media (max-width: 768px) {
  .app-container {
    padding: 18px 14px calc(50px + env(safe-area-inset-bottom, 0px));
  }

  .app-header {
    margin-bottom: 24px;
  }

  .main-title {
    font-size: clamp(1.85rem, 7vw, 2.4rem);
    margin-bottom: 8px;
  }

  .sub-title {
    font-size: 0.94rem;
    line-height: 1.45;
    padding: 0 4px;
  }

  .search-card {
    padding: 16px 14px;
    margin-bottom: 22px;
  }

  .input-group {
    flex-direction: column;
    gap: 10px;
  }

  .input-field-wrapper {
    width: 100%;
  }

  .url-input {
    padding: 14px 88px 14px 44px;
    font-size: 0.95rem;
  }

  .input-icon-wrapper {
    left: 14px;
  }

  .paste-btn {
    right: 8px;
    padding: 6px 10px;
    font-size: 0.78rem;
  }

  .btn-fetch {
    width: 100%;
    justify-content: center;
    min-height: 48px;
    font-size: 1rem;
    padding: 14px 20px;
  }

  .video-card {
    grid-template-columns: 1fr;
    padding: 18px 14px;
    gap: 16px;
    margin-bottom: 22px;
  }

  .video-title {
    font-size: 1.15rem;
  }

  .video-meta-row {
    gap: 12px;
    font-size: 0.85rem;
  }

  .quality-pill {
    padding: 8px 12px;
    font-size: 0.84rem;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
  }

  .split-config-card {
    padding: 18px 14px;
    margin-bottom: 22px;
  }

  .section-heading h2 {
    font-size: 1.2rem;
  }

  .mode-tabs {
    gap: 4px;
    margin-bottom: 18px;
  }

  .mode-tab {
    font-size: 0.84rem;
    padding: 10px 8px;
    min-height: 44px;
    gap: 6px;
  }

  .split-input-row {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 18px;
  }

  .input-field-group label {
    font-size: 0.8rem;
  }

  .styled-number-input {
    padding: 12px 14px;
    font-size: 1rem;
    min-height: 46px;
  }

  .timeline-container {
    padding: 14px;
    margin-bottom: 20px;
  }

  .btn-process {
    padding: 16px 20px;
    font-size: 1.05rem;
    min-height: 52px;
    gap: 10px;
  }

  .progress-card {
    padding: 20px 14px;
    margin-bottom: 22px;
  }

  .results-card {
    padding: 20px 14px;
    margin-bottom: 30px;
  }

  .results-header-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    margin-bottom: 18px;
  }

  .btn-zip-download {
    width: 100%;
    justify-content: center;
    padding: 14px 18px;
    min-height: 48px;
    font-size: 0.95rem;
  }

  .parts-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .part-actions {
    gap: 8px;
  }

  .btn-part-preview, .btn-part-download {
    min-height: 44px;
    font-size: 0.88rem;
    padding: 10px;
  }

  /* Mobile Toast positioning at bottom center */
  .toast-container {
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    left: 14px;
    right: 14px;
    align-items: center;
  }

  .toast {
    width: 100%;
    max-width: 440px;
    font-size: 0.88rem;
    padding: 12px 16px;
    box-sizing: border-box;
  }

  /* Mobile Preview Modal */
  .modal-content {
    width: 95vw;
    max-height: 85vh;
    border-radius: var(--radius-md);
  }
}

@media (max-width: 420px) {
  .split-input-row {
    grid-template-columns: 1fr;
  }
  .mode-tabs {
    flex-direction: column;
  }
}