:root {
  --primary: #FF0000;
  --primary-hover: #E10000;
  --primary-light: #FFECEC;
  --primary-glow: rgba(255, 0, 0, 0.15);
  --bg-app: #F9F9FB;
  --bg-card: #FFFFFF;
  --bg-input: #F8F8FA;
  --bg-input-focus: #FFFFFF;
  --text-main: #0F0F0F;
  --text-body: #212121;
  --text-muted: #606060;
  --text-light: #909090;
  --border-color: #EFEFEF;
  --border-hover: #D5D5D5;
  --success: #10B981;
  --success-light: #ECFDF5;
  --success-border: #A7F3D0;
  --error: #EF4444;
  --error-light: #FEF2F2;
  --error-border: #FCA5A5;
  --font-family-title: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 45px rgba(0, 0, 0, 0.09);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-family-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-body);
  background-color: var(--bg-app);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 40px 20px;
}

.app-container {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-header {
  text-align: center;
  margin-bottom: 8px;
}

.logo-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.logo-icon {
  width: 38px;
  height: 38px;
  stroke: var(--primary);
  stroke-width: 2.2;
  transition: transform var(--transition-normal);
}

.logo-wrapper:hover .logo-icon {
  transform: rotate(-15deg) scale(1.1);
}

.logo-text {
  font-family: var(--font-family-title);
  font-size: 26px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.logo-text span {
  color: var(--primary);
}

.app-header h1 {
  font-family: var(--font-family-title);
  font-size: 32px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.subtitle {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto;
}

.card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  padding: 30px;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 24px 0;
}

.btn {
  font-family: var(--font-family-title);
  font-size: 15px;
  font-weight: 600;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.btn-primary {
  background-color: var(--primary);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 4px 15px var(--primary-glow);
  transform: translateY(-1px);
}

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

.btn-secondary {
  background-color: var(--bg-app);
  color: var(--text-body);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: #F1F1F3;
  border-color: var(--border-hover);
}

.btn-large {
  padding: 16px 32px;
  font-size: 17px;
}

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

.btn-icon {
  width: 18px;
  height: 18px;
  stroke-width: 2.5;
  transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-icon {
  transform: translateX(3px);
}

.btn-icon-left {
  width: 20px;
  height: 20px;
  stroke-width: 2.2;
}

.input-card {
  padding: 24px;
}

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

.input-wrapper {
  position: relative;
  flex-grow: 1;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 16px;
  width: 20px;
  height: 20px;
  color: var(--text-light);
  pointer-events: none;
  transition: color var(--transition-fast);
}

#youtube-url {
  width: 100%;
  padding: 16px 44px 16px 48px;
  font-family: var(--font-family-body);
  font-size: 15px;
  color: var(--text-main);
  background-color: var(--bg-input);
  border: 1.5px solid transparent;
  border-radius: var(--radius-md);
  outline: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#youtube-url:focus {
  background-color: var(--bg-input-focus);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

#youtube-url:focus ~ .input-icon {
  color: var(--primary);
}

.clear-btn {
  position: absolute;
  right: 14px;
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), background-color var(--transition-fast);
}

.clear-btn:hover {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--text-main);
}

.clear-btn svg {
  width: 16px;
  height: 16px;
}

.clear-btn.visible {
  opacity: 1;
  pointer-events: auto;
}

.error-card {
  border-color: var(--error-border);
  background-color: var(--error-light);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.error-content {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.error-icon-wrapper {
  background-color: var(--error);
  color: #FFFFFF;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 3px 10px rgba(239, 68, 68, 0.2);
}

.error-icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
}

.error-text h3 {
  font-family: var(--font-family-title);
  font-size: 16px;
  font-weight: 600;
  color: #991B1B;
  margin-bottom: 2px;
}

.error-text p {
  font-size: 14px;
  color: #B91C1C;
}

.error-close-btn {
  background: none;
  border: none;
  color: #B91C1C;
  cursor: pointer;
  align-self: flex-start;
  padding: 4px;
  border-radius: 50%;
  display: flex;
  transition: background-color var(--transition-fast);
}

.error-close-btn:hover {
  background-color: rgba(239, 68, 68, 0.1);
}

.error-close-btn svg {
  width: 18px;
  height: 18px;
}

.loading-card {
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.loading-status {
  display: flex;
  align-items: center;
  gap: 14px;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 0, 0, 0.1);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}

.loading-text {
  font-family: var(--font-family-title);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
}

.skeleton-layout {
  display: flex;
  gap: 20px;
}

.skeleton-thumbnail {
  width: 180px;
  height: 110px;
  border-radius: var(--radius-md);
  background-color: #EFEFEF;
  flex-shrink: 0;
}

.skeleton-info {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  justify-content: center;
}

.skeleton-line {
  height: 14px;
  background-color: #EFEFEF;
  border-radius: 4px;
}

.skeleton-title {
  width: 85%;
  height: 18px;
}

.skeleton-channel {
  width: 45%;
  height: 14px;
  margin-bottom: 4px;
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.skeleton-grid .skeleton-line {
  width: 90%;
  height: 12px;
}

.skeleton-pulse {
  background: linear-gradient(
    90deg,
    #ECEBEB 25%,
    #F4F3F3 50%,
    #ECEBEB 75%
  );
  background-size: 200% 100%;
  animation: loading-pulse 1.5s infinite;
}

.video-details-layout {
  display: flex;
  gap: 24px;
}

.thumbnail-wrapper {
  position: relative;
  width: 200px;
  height: 120px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  background-color: #000;
  flex-shrink: 0;
}

.video-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.video-thumbnail.loaded {
  opacity: 1;
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background-color: rgba(15, 15, 15, 0.85);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
}

.metadata-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.video-title {
  font-family: var(--font-family-title);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-channel-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.metadata-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-light);
  margin-bottom: 2px;
}

.meta-value {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-body);
}

.quality-selection-section h3 {
  font-family: var(--font-family-title);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

.quality-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.format-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.format-selection-section h3 {
  font-family: var(--font-family-title);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

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

.quality-card {
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 14px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  background-color: var(--bg-card);
}

.quality-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.quality-card-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.bitrate {
  font-family: var(--font-family-title);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
}

.quality-label {
  font-size: 12px;
  color: var(--text-muted);
}

.quality-size-est {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-light);
  margin-top: 2px;
}

.selection-indicator {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.selection-indicator::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #FFFFFF;
  opacity: 0;
  transform: scale(0.5);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.quality-card input[type="radio"]:checked ~ .quality-card-content .bitrate {
  color: var(--primary);
}

.quality-card input[type="radio"]:checked ~ .quality-card-content .quality-size-est {
  color: var(--primary-hover);
}

.quality-card input[type="radio"]:checked + .quality-card-content + .selection-indicator,
.quality-card input[type="radio"]:checked ~ .selection-indicator {
  border-color: var(--primary);
  background-color: var(--primary);
}

.quality-card input[type="radio"]:checked ~ .selection-indicator::after {
  opacity: 1;
  transform: scale(1);
}

.quality-card:has(input[type="radio"]:checked) {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.action-btn-wrapper {
  margin-top: 24px;
}

.progress-card h3 {
  font-family: var(--font-family-title);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.progress-file-info {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.progress-bar-container {
  height: 10px;
  background-color: #EFEFEF;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 20px;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #FF4D4D);
  border-radius: var(--radius-sm);
  width: 0%;
  transition: width 0.15s ease-out;
}

.progress-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.progress-stat {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 11px;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.stat-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-body);
}

.success-card {
  text-align: center;
  padding: 40px 30px;
}

.success-icon-wrapper {
  margin: 0 auto 24px auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.success-checkmark {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  stroke: var(--success);
  stroke-width: 3;
  stroke-miterlimit: 10;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.15);
}

.checkmark-circle {
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  stroke-width: 3;
  stroke-miterlimit: 10;
  stroke: var(--success);
  fill: none;
  animation: stroke-circle 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.checkmark-check {
  transform-origin: 50% 50%;
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  stroke-width: 3;
  animation: stroke-check 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.6s forwards;
}

.success-card h2 {
  font-family: var(--font-family-title);
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.success-description {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.success-file-summary {
  background-color: var(--success-light);
  border: 1px solid var(--success-border);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 28px;
  text-align: left;
}

.summary-title {
  font-family: var(--font-family-title);
  font-size: 15px;
  font-weight: 600;
  color: #065F46;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.summary-details {
  font-size: 13px;
  color: #047857;
  display: flex;
  align-items: center;
  gap: 8px;
}

.bullet {
  color: #34D399;
}

.success-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.app-footer {
  text-align: center;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary);
  text-decoration: underline;
}

.footer-divider {
  color: var(--text-light);
  font-size: 10px;
}

.copyright {
  font-size: 12px;
  color: var(--text-light);
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 15, 15, 0.45);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay:not(.hidden) {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 500px;
  padding: 32px;
  position: relative;
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-overlay:not(.hidden) .modal-card {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  font-size: 26px;
  line-height: 1;
  color: var(--text-light);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-card h2 {
  font-family: var(--font-family-title);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

.modal-body-content {
  max-height: 350px;
  overflow-y: auto;
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.5;
}

.modal-body-content h4 {
  font-family: var(--font-family-title);
  font-size: 15px;
  font-weight: 600;
  margin: 16px 0 6px 0;
  color: var(--text-main);
}

.hidden {
  display: none !important;
}

.animate-fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes loading-pulse {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

@keyframes stroke-circle {
  100% {
    stroke-dashoffset: 0;
  }
}

@keyframes stroke-check {
  100% {
    stroke-dashoffset: 0;
  }
}

@media (max-width: 768px) {
  body {
    padding: 24px 16px;
  }
  .app-container {
    gap: 20px;
  }
  .app-header h1 {
    font-size: 28px;
  }
  .card {
    padding: 24px;
  }
  .video-details-layout {
    gap: 20px;
  }
  .thumbnail-wrapper {
    width: 160px;
    height: 96px;
  }
}

@media (max-width: 576px) {
  .input-group {
    flex-direction: column;
    width: 100%;
    align-items: stretch;
  }
  #get-video-btn {
    width: 100%;
  }
  .video-details-layout {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 16px;
  }
  .thumbnail-wrapper {
    width: 100%;
    max-width: 280px;
    height: 160px;
  }
  .metadata-content {
    width: 100%;
  }
  .video-title {
    font-size: 16px;
  }
  .metadata-grid {
    gap: 8px;
    margin-top: 12px;
  }
  .quality-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .format-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .quality-card {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
  }
  .quality-card-content {
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
  }
  .quality-size-est {
    margin-top: 0;
  }
  .selection-indicator {
    position: static;
  }
  .skeleton-layout {
    flex-direction: column;
    gap: 16px;
  }
  .skeleton-thumbnail {
    width: 100%;
    height: 140px;
  }
  .progress-stats-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

/* ==========================================================================
   Dark Theme Configuration Overrides
   ========================================================================== */
body {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.card {
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

body.dark-theme {
  --bg-app: #0F0F0F;          /* YouTube Dark Theme Background */
  --bg-card: #1F1F1F;         /* Dark Card Background */
  --bg-input: #121212;
  --bg-input-focus: #1A1A1A;
  
  --text-main: #F1F1F1;       /* Light main text */
  --text-body: #AAAAAA;       /* Muted secondary body text */
  --text-muted: #888888;      /* Muted tertiary sub-labels */
  --text-light: #5F5F5F;      
  
  --border-color: #2D2D2D;    /* Sleek dark dividers */
  --border-hover: #3F3F3F;
  
  --primary-light: #2A0E0E;   /* Deep red glow for dark mode */
  
  --success-light: #0D2A1C;
  --success-border: #134E35;
  
  --error-light: #2D1010;
  --error-border: #4A1515;
}

/* Header layout for theme button */
.header-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  width: 100%;
}

.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  padding: 8px;
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--border-color);
  transform: rotate(15deg);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  stroke-width: 2.2;
}

/* Hide/Show icons based on current theme class */
body:not(.dark-theme) .sun-icon {
  display: none;
}
body.dark-theme .moon-icon {
  display: none;
}

/* ==========================================================================
   Clipboard Paste Button & Input Updates
   ========================================================================== */
.input-wrapper input {
  padding-right: 102px !important; /* Make room for Paste (static right: 48px) and Clear (static right: 12px) */
}

.paste-btn {
  position: absolute;
  right: 48px;
  background-color: var(--border-color);
  color: var(--text-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-family: var(--font-family-title);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.paste-btn:hover {
  background-color: var(--border-hover);
  color: var(--text-main);
}

.validation-message {
  color: var(--error);
  font-size: 13px;
  font-weight: 500;
  margin-top: 8px;
  display: block;
  animation: fadeIn var(--transition-fast) ease-out;
}

/* ==========================================================================
   Copy Metadata Elements
   ========================================================================== */
.meta-title-row, .meta-channel-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.copy-meta-btn {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}

.copy-meta-btn:hover {
  background-color: var(--border-color);
  color: var(--text-main);
}

.copy-meta-btn svg {
  width: 16px;
  height: 16px;
}

/* ==========================================================================
   Drag and Drop Highlighting
   ========================================================================== */
.input-card {
  border: 1.5px dashed transparent;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.input-card.drag-over {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

/* ==========================================================================
   Collapsible Recent Downloads Section
   ========================================================================== */
.history-card {
  padding: 24px;
  margin-top: 12px;
}

.history-toggle-btn {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-family-title);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  padding: 0;
}

.history-toggle-btn .chevron-icon {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-normal);
}

.history-toggle-btn[aria-expanded="true"] .chevron-icon {
  transform: rotate(180deg);
}

.history-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease-out;
  opacity: 0;
}

.history-content.expanded {
  max-height: 800px; /* Large enough for 20 items container */
  opacity: 1;
  margin-top: 18px;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 480px;
  overflow-y: auto;
  padding-right: 4px;
}

/* Custom Scrollbar for History list */
.history-list::-webkit-scrollbar {
  width: 6px;
}
.history-list::-webkit-scrollbar-track {
  background: transparent;
}
.history-list::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}
.history-list::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

.history-empty-state {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  padding: 16px 0;
}

.history-item {
  display: flex;
  gap: 14px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.history-item:hover {
  transform: translateY(-1px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.history-thumb-wrapper {
  width: 80px;
  height: 48px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background-color: #000;
}

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

.history-details {
  flex-grow: 1;
  min-width: 0;
}

.history-title {
  font-family: var(--font-family-title);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
  margin-bottom: 2px;
}

.history-meta {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  gap: 8px;
  align-items: center;
}

.history-meta span {
  display: inline-flex;
  align-items: center;
}

.history-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.history-action-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-body);
  padding: 8px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  width: 34px;
  height: 34px;
}

.history-action-btn:hover {
  background-color: var(--border-color);
  color: var(--text-main);
}

.history-action-btn.delete-btn:hover {
  background-color: var(--error-light);
  color: var(--error);
  border-color: var(--error-border);
}

.history-action-btn svg {
  width: 16px;
  height: 16px;
  stroke-width: 2.2;
}

/* ==========================================================================
   Toast Notification System Styles
   ========================================================================== */
.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
  max-width: 340px;
  width: calc(100% - 48px);
}

.toast {
  pointer-events: auto;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-main);
  font-size: 14px;
  font-weight: 500;
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* Toast Color Variations */
.toast-success {
  border-color: var(--success-border);
  background-color: var(--success-light);
  color: #065F46;
}
.toast-success .toast-icon {
  color: var(--success);
}

.toast-error {
  border-color: var(--error-border);
  background-color: var(--error-light);
  color: #991B1B;
}
.toast-error .toast-icon {
  color: var(--error);
}

.toast-warning {
  border-color: #FDE047;
  background-color: #FEF9C3;
  color: #854D0E;
}
.toast-warning .toast-icon {
  color: #EAB308;
}

.toast-info {
  border-color: #93C5FD;
  background-color: #EFF6FF;
  color: #1E40AF;
}
.toast-info .toast-icon {
  color: #3B82F6;
}

/* Slide in/out transitions */
.animate-toast-in {
  animation: toastSlideIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-toast-out {
  animation: toastSlideOut 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(120%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toastSlideOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(120%) scale(0.9);
  }
}

/* ==========================================================================
   Accessibility Focus States (A11y)
   ========================================================================== */
button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* ==========================================================================
   Additional Mobile Breaks (320px up to 576px)
   ========================================================================== */
@media (max-width: 576px) {
  .toast-container {
    top: 16px;
    right: 16px;
    left: 16px;
    width: auto;
    max-width: none;
  }
  
  .history-item {
    padding: 10px;
    gap: 10px;
  }
  
  .history-thumb-wrapper {
    width: 64px;
    height: 38px;
  }
  
  .history-actions {
    gap: 6px;
  }
  
  .history-action-btn {
    width: 38px;
    height: 38px;
    padding: 10px;
  }

  /* Accessible touch sizing for buttons */
  .btn,
  .copy-meta-btn,
  .clear-btn,
  .paste-btn,
  .theme-toggle-btn {
    min-height: 44px;
    min-width: 44px;
  }
  
  .paste-btn {
    padding: 10px 12px;
  }
}