/* ============================================================
   FreeFrame Lite — Design System & Complete Stylesheet
   A premium dark-theme CSS for a YouTube video review platform
   ============================================================ */

/* ----------------------------------------------------------
   Design Tokens (Custom Properties)
   ---------------------------------------------------------- */
:root {
  /* Backgrounds */
  --bg-deepest:    #0a0e17;
  --bg-main:       #0f1419;
  --bg-card:       #1a1f2e;
  --bg-elevated:   #242b3d;

  /* Accent */
  --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --accent-blue:   #3b82f6;
  --accent-violet: #8b5cf6;

  /* Text */
  --text-primary:   #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;

  /* Semantic */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error:   #ef4444;

  /* Borders */
  --border-color: rgba(255, 255, 255, 0.06);
  --border-subtle: rgba(255, 255, 255, 0.08);

  /* Glass */
  --glass-bg:       rgba(15, 20, 25, 0.8);
  --glass-blur:     blur(20px);
  --glass-border:   1px solid rgba(255, 255, 255, 0.08);

  /* Radius */
  --radius-card:   12px;
  --radius-btn:    8px;
  --radius-pill:   20px;
  --radius-lg:     16px;
  --radius-xl:     20px;

  /* Font */
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows */
  --shadow-sm:  0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md:  0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg:  0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-xl:  0 24px 80px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.15);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}


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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, video, iframe {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

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


/* ----------------------------------------------------------
   Global Scrollbar Styles
   ---------------------------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}


/* ----------------------------------------------------------
   Layout — Header
   ---------------------------------------------------------- */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: var(--glass-border);
}

.logo {
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  user-select: none;
}

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


/* ----------------------------------------------------------
   Layout — Main Content
   ---------------------------------------------------------- */
.main-content {
  padding-top: 80px;
  max-width: 1400px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
  padding-bottom: 40px;
}


/* ----------------------------------------------------------
   Layout — Sidebar
   ---------------------------------------------------------- */
.sidebar {
  position: fixed;
  left: 0;
  top: 64px;
  width: 280px;
  height: calc(100vh - 64px);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: var(--glass-border);
  overflow-y: auto;
  z-index: 90;
}


/* ----------------------------------------------------------
   Dashboard View
   ---------------------------------------------------------- */
.dashboard {
  padding-top: 16px;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
  cursor: pointer;
}

.project-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-glow);
}

.project-card .thumbnail {
  aspect-ratio: 16 / 9;
  background-size: cover;
  background-position: center;
  background-color: var(--bg-elevated);
  position: relative;
}

.project-card .card-body {
  padding: 20px;
}

.project-card .card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.project-card .card-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: row;
  gap: 16px;
  align-items: center;
}

.project-card .status-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.status-badge.pending {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
}

.status-badge.approved {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
}

.status-badge.changes {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  text-align: center;
}

.empty-state .empty-icon {
  font-size: 4rem;
  margin-bottom: 20px;
  opacity: 0.3;
}

.empty-state .empty-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.empty-state .empty-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 400px;
  line-height: 1.6;
}


/* ----------------------------------------------------------
   Buttons
   ---------------------------------------------------------- */
.btn-create {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-gradient);
  color: #fff;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-card);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
  transition: filter var(--transition-base), transform var(--transition-base);
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
}

.btn-create:hover {
  filter: brightness(1.1);
}

.btn-create:active {
  transform: scale(0.98);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  color: var(--text-primary);
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  transition: background var(--transition-base);
  font-size: 0.9rem;
  cursor: pointer;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
}

.btn-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  color: var(--text-secondary);
  transition: transform var(--transition-base), background var(--transition-base);
  cursor: pointer;
}

.btn-icon:hover {
  transform: scale(1.08);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-error);
  color: #fff;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  transition: filter var(--transition-base);
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
}

.btn-danger:hover {
  filter: brightness(1.15);
}


/* ----------------------------------------------------------
   Review View
   ---------------------------------------------------------- */
.review-container {
  padding-top: 0;
}

.review-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 0;
  min-height: calc(100vh - 80px);
}

.video-section {
  position: relative;
  background: #000;
  display: flex;
  flex-direction: column;
}

.video-wrapper {
  position: relative;
  aspect-ratio: 16 / 9;
  max-height: 70vh;
  margin: 0 auto;
  width: 100%;
  background: #000;
}

.video-wrapper iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.canvas-overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  pointer-events: none;
}

.canvas-overlay.drawing {
  pointer-events: auto;
  cursor: crosshair;
}


/* ----------------------------------------------------------
   Timeline Scrubber
   ---------------------------------------------------------- */
.timeline {
  width: 100%;
}

.timeline-bar {
  height: 48px;
  background: var(--bg-card);
  padding: 0 16px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
}

.timeline-track {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  position: relative;
  cursor: pointer;
  transition: height var(--transition-base);
}

.timeline-track:hover {
  height: 10px;
}

.timeline-progress {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 3px;
  pointer-events: none;
}

.timeline-marker {
  position: absolute;
  width: 4px;
  height: 16px;
  top: 50%;
  transform: translateY(-50%);
  border-radius: 2px;
  z-index: 5;
  cursor: pointer;
  transition: height var(--transition-fast);
}

.timeline-marker:hover {
  height: 22px;
}

.timeline-marker.comment-marker {
  background: var(--accent-blue);
}

.timeline-marker.annotation-marker {
  background: var(--color-warning);
}

.timeline-playhead {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-gradient);
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.4);
  cursor: grab;
}

.timeline-playhead:active {
  cursor: grabbing;
  transform: translate(-50%, -50%) scale(1.2);
}

.time-display {
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-secondary);
  min-width: 100px;
  text-align: center;
  user-select: none;
}

.playback-controls {
  display: flex;
  flex-direction: row;
  gap: 8px;
}

.playback-controls button {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text-secondary);
  border: none;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: color var(--transition-base), background var(--transition-base);
  font-size: 1rem;
}

.playback-controls button:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}


/* ----------------------------------------------------------
   Comments Panel (Sidebar)
   ---------------------------------------------------------- */
.panel-sidebar {
  background: var(--bg-main);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: calc(100vh - 80px);
  position: sticky;
  top: 80px;
}

.panel-tabs {
  display: flex;
  flex-direction: row;
  border-bottom: 1px solid var(--border-color);
  height: 48px;
  flex-shrink: 0;
}

.panel-tab {
  flex: 1;
  text-align: center;
  padding: 12px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base);
  user-select: none;
}

.panel-tab:hover {
  color: var(--text-secondary);
}

.panel-tab.active {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
}

.panel-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  scroll-behavior: smooth;
}

.panel-content::-webkit-scrollbar {
  width: 4px;
}

.panel-content::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}


/* ----------------------------------------------------------
   Comment Items
   ---------------------------------------------------------- */
.comment-item {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-base);
}

.comment-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

.comment-item.highlight {
  background: rgba(59, 130, 246, 0.08);
  border-left: 3px solid var(--accent-blue);
}

.comment-header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.comment-author {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.comment-timestamp {
  font-size: 0.75rem;
  color: var(--accent-blue);
  cursor: pointer;
  padding: 2px 8px;
  background: rgba(59, 130, 246, 0.1);
  border-radius: 4px;
  font-variant-numeric: tabular-nums;
  transition: background var(--transition-base);
  user-select: none;
}

.comment-timestamp:hover {
  background: rgba(59, 130, 246, 0.2);
}

.comment-body {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.comment-actions {
  display: flex;
  flex-direction: row;
  gap: 8px;
  margin-top: 8px;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.comment-item:hover .comment-actions {
  opacity: 1;
}

.comment-reactions {
  display: flex;
  flex-direction: row;
  gap: 4px;
  margin-top: 8px;
}

.reaction-btn {
  font-size: 0.8rem;
  padding: 2px 8px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: background var(--transition-base);
  color: var(--text-secondary);
}

.reaction-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}


/* ----------------------------------------------------------
   Comment Input
   ---------------------------------------------------------- */
.comment-input-area {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-main);
  flex-shrink: 0;
}

.comment-input-area textarea {
  width: 100%;
  min-height: 80px;
  resize: vertical;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  line-height: 1.5;
  transition: border-color var(--transition-base);
}

.comment-input-area textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
}

.comment-input-area textarea::placeholder {
  color: var(--text-muted);
}

.comment-input-actions {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
}


/* ----------------------------------------------------------
   Annotation Toolbar
   ---------------------------------------------------------- */
.annotation-toolbar {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: row;
  gap: 4px;
  padding: 8px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  z-index: 20;
  box-shadow: var(--shadow-lg);
}

.tool-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: 1.1rem;
  border: none;
}

.tool-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.tool-btn.active {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.tool-separator {
  width: 1px;
  height: 28px;
  background: var(--border-color);
  margin: 0 4px;
  align-self: center;
}

.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.color-swatch:hover {
  transform: scale(1.1);
}

.color-swatch.active {
  border-color: #fff;
  transform: scale(1.2);
}

.stroke-width-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
}

.stroke-width-btn:hover {
  background: rgba(255, 255, 255, 0.08);
}

.stroke-width-btn .dot {
  border-radius: 50%;
  background: currentColor;
}


/* ----------------------------------------------------------
   Approval Section
   ---------------------------------------------------------- */
.approval-section {
  padding: 16px 0;
}

.approval-status {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
}

.approval-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-card);
  padding: 16px;
}

.approval-reviewer {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
}

.reviewer-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  color: #fff;
  flex-shrink: 0;
}

.approval-actions {
  display: flex;
  flex-direction: row;
  gap: 8px;
  margin-top: 12px;
}

.btn-approve {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-success);
  color: #fff;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  transition: filter var(--transition-base);
}

.btn-approve:hover {
  filter: brightness(1.15);
}

.btn-reject {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-error);
  color: #fff;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  transition: filter var(--transition-base);
}

.btn-reject:hover {
  filter: brightness(1.15);
}

.btn-changes {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-warning);
  color: #000;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  transition: filter var(--transition-base);
}

.btn-changes:hover {
  filter: brightness(1.1);
}


/* ----------------------------------------------------------
   Modal
   ---------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}

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

.modal {
  background: var(--bg-card);
  border: var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 32px;
  max-width: 500px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
}

/* Form Elements */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
  display: block;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color var(--transition-base);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-blue);
}

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


/* ----------------------------------------------------------
   Toast Notifications
   ---------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-card);
  padding: 14px 20px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-md);
  animation: slideInRight 0.3s ease;
  pointer-events: auto;
  color: var(--text-primary);
  max-width: 400px;
}

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

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

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

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}


/* ----------------------------------------------------------
   Share Modal
   ---------------------------------------------------------- */
.share-link-container {
  display: flex;
  flex-direction: row;
  gap: 8px;
  align-items: stretch;
}

.share-link-input {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: var(--font-family);
}

.share-link-input:focus {
  outline: none;
  border-color: var(--accent-blue);
}

.btn-copy {
  background: var(--accent-gradient);
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  transition: filter var(--transition-base);
  white-space: nowrap;
}

.btn-copy:hover {
  filter: brightness(1.1);
}


/* ----------------------------------------------------------
   Video List (Project View)
   ---------------------------------------------------------- */
.video-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.video-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background: var(--bg-card);
  border-radius: var(--radius-card);
  cursor: pointer;
  transition: background var(--transition-base);
  border: 1px solid transparent;
}

.video-item:hover {
  background: var(--bg-elevated);
}

.video-item.active {
  border-left: 3px solid var(--accent-blue);
  background: rgba(59, 130, 246, 0.05);
}

.video-thumb {
  width: 120px;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-btn);
  object-fit: cover;
  background: var(--bg-elevated);
  flex-shrink: 0;
}

.video-info {
  flex: 1;
  min-width: 0;
}

.video-title {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

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


/* ----------------------------------------------------------
   Utility Classes
   ---------------------------------------------------------- */
.hidden {
  display: none !important;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.gap-8 {
  gap: 8px;
}

.gap-16 {
  gap: 16px;
}

.gap-24 {
  gap: 24px;
}

.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.fade-in {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.slide-up {
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* ----------------------------------------------------------
   Responsive Design
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .review-layout {
    grid-template-columns: 1fr;
  }

  .panel-sidebar {
    position: relative;
    top: auto;
    height: auto;
    max-height: 50vh;
    border-left: none;
    border-top: 1px solid var(--border-color);
  }

  .sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .project-grid {
    grid-template-columns: 1fr;
  }

  .app-header {
    padding: 0 16px;
    height: 56px;
  }

  .main-content {
    padding-top: 72px;
    padding-left: 16px;
    padding-right: 16px;
    padding-bottom: 24px;
  }

  .logo {
    font-size: 1.25rem;
  }

  .dashboard-header {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }

  .video-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .video-thumb {
    width: 100%;
  }

  .annotation-toolbar {
    bottom: 60px;
    padding: 6px;
    gap: 2px;
    border-radius: 12px;
  }

  .tool-btn {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }

  .modal {
    padding: 24px;
    border-radius: 16px;
  }
}

@media (max-width: 480px) {
  .app-header {
    padding: 0 12px;
  }

  .main-content {
    padding-left: 12px;
    padding-right: 12px;
  }

  .project-card .card-body {
    padding: 14px;
  }

  .btn-create {
    padding: 10px 18px;
    font-size: 0.85rem;
  }

  .timeline-bar {
    padding: 0 10px;
    gap: 8px;
    height: 42px;
  }

  .time-display {
    font-size: 0.75rem;
    min-width: 80px;
  }

  .playback-controls button {
    width: 32px;
    height: 32px;
  }

  .panel-tabs {
    height: 42px;
  }

  .panel-tab {
    font-size: 0.8rem;
    padding: 10px;
  }

  .comment-input-area {
    padding: 12px;
  }

  .comment-input-area textarea {
    min-height: 60px;
    padding: 10px;
  }

  .toast-container {
    bottom: 12px;
    right: 12px;
    left: 12px;
  }

  .toast {
    padding: 12px 16px;
    font-size: 0.85rem;
  }

  .share-link-container {
    flex-direction: column;
  }

  .modal {
    padding: 20px;
    max-width: 95%;
  }
}