/* ============================================================
   AI YouTube Studio - Shared Styles
   Modern Dark Theme with Topic-Specific Neon Accents
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+KR:wght@300;400;500;600;700;800&display=swap');

/* ============================================================
   CSS Custom Properties (Variables)
   ============================================================ */
:root {
  /* Base Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #13131a;
  --bg-card: #1a1a24;
  --bg-card-hover: #20202e;
  --bg-input: #12121a;
  --border-color: #2a2a3d;
  --border-glow: rgba(255,255,255,0.08);

  /* Text */
  --text-primary: #f0f0f8;
  --text-secondary: #9090b0;
  --text-muted: #606080;

  /* Topic Colors (overridden per page) */
  --accent: #00BCD4;
  --accent-dim: rgba(0,188,212,0.15);
  --accent-glow: 0 0 20px rgba(0,188,212,0.3);
  --gradient-start: #00BCD4;
  --gradient-end: #0097A7;

  /* Status Colors */
  --success: #00C853;
  --warning: #FFB300;
  --error: #FF3D00;
  --info: #2979FF;

  /* Spacing */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.35);

  /* Transitions */
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
  --transition-slow: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Topic Color Themes */
.theme-economy  { --accent: #FFD700; --accent-dim: rgba(255,215,0,0.12); --accent-glow: 0 0 30px rgba(255,215,0,0.25); --gradient-start: #FFD700; --gradient-end: #FFA000; }
.theme-coffee   { --accent: #D4956A; --accent-dim: rgba(212,149,106,0.12); --accent-glow: 0 0 30px rgba(212,149,106,0.25); --gradient-start: #D4956A; --gradient-end: #8B4513; }
.theme-health   { --accent: #00C853; --accent-dim: rgba(0,200,83,0.12); --accent-glow: 0 0 30px rgba(0,200,83,0.25); --gradient-start: #00C853; --gradient-end: #00897B; }
.theme-ai       { --accent: #00BCD4; --accent-dim: rgba(0,188,212,0.12); --accent-glow: 0 0 30px rgba(0,188,212,0.25); --gradient-start: #00BCD4; --gradient-end: #0288D1; }
.theme-beauty   { --accent: #FF4081; --accent-dim: rgba(255,64,129,0.12); --accent-glow: 0 0 30px rgba(255,64,129,0.25); --gradient-start: #FF4081; --gradient-end: #E91E63; }
.theme-senior   { --accent: #AB47BC; --accent-dim: rgba(171,71,188,0.12); --accent-glow: 0 0 30px rgba(171,71,188,0.25); --gradient-start: #AB47BC; --gradient-end: #7B1FA2; }
.theme-humor    { --accent: #FF6D00; --accent-dim: rgba(255,109,0,0.12); --accent-glow: 0 0 30px rgba(255,109,0,0.25); --gradient-start: #FF6D00; --gradient-end: #E65100; }
.theme-religion { --accent: #5C6BC0; --accent-dim: rgba(92,107,192,0.12); --accent-glow: 0 0 30px rgba(92,107,192,0.25); --gradient-start: #5C6BC0; --gradient-end: #1A237E; }

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Noto Sans KR', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Scrollbar Styling */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ============================================================
   Typography
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p { color: var(--text-secondary); margin-bottom: 0.5rem; }
a { color: var(--accent); text-decoration: none; transition: var(--transition-fast); }
a:hover { opacity: 0.8; }

/* ============================================================
   Layout Utilities
   ============================================================ */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-sm { max-width: 960px; }
.container-md { max-width: 1200px; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.25rem; }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { display: flex; flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

/* ============================================================
   Components: Cards
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md), 0 0 0 1px var(--accent-dim);
  transform: translateY(-2px);
}

.card:hover::before { opacity: 1; }

.card-glass {
  background: rgba(26, 26, 36, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glow);
}

/* ============================================================
   Components: Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  opacity: 0;
  transition: var(--transition-fast);
}

.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  box-shadow: 0 4px 15px var(--accent-dim);
}

.btn-primary:hover {
  box-shadow: var(--accent-glow);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent-dim);
  box-shadow: var(--accent-glow);
}

.btn-danger {
  background: linear-gradient(135deg, #FF3D00, #D50000);
  color: #fff;
}

.btn-success {
  background: linear-gradient(135deg, #00C853, #00897B);
  color: #fff;
}

.btn-lg { padding: 0.85rem 2rem; font-size: 1rem; border-radius: var(--radius-lg); }
.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.8rem; border-radius: var(--radius-sm); }
.btn-icon { padding: 0.5rem; border-radius: var(--radius-sm); aspect-ratio: 1; }
.btn-full { width: 100%; }
.btn-disabled, .btn:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

/* ============================================================
   Components: Form Elements
   ============================================================ */
.form-group { margin-bottom: 1.25rem; }

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.7rem 1rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
  background: rgba(255,255,255,0.03);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

/* ============================================================
   Components: Checkboxes & Toggle
   ============================================================ */
.checkbox-group { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  user-select: none;
}

.checkbox-item:hover { border-color: var(--accent); background: var(--accent-dim); }
.checkbox-item.selected {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.checkbox-item input[type="checkbox"] { display: none; }

.checkbox-item .check-icon {
  width: 16px; height: 16px;
  border: 2px solid currentColor;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 10px;
}

.checkbox-item.selected .check-icon::after { content: '✓'; }

/* Toggle Switch */
.toggle-group { display: flex; align-items: center; gap: 0.75rem; }

.toggle {
  position: relative;
  width: 48px;
  height: 26px;
  cursor: pointer;
}

.toggle input { display: none; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border-color);
  border-radius: 13px;
  transition: var(--transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px; height: 20px;
  left: 3px; top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: var(--transition);
}

.toggle input:checked + .toggle-slider { background: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(22px); }

/* ============================================================
   Components: Progress & Steps
   ============================================================ */
.progress-bar {
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  border-radius: 3px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer { to { left: 250%; } }

/* Step Indicator */
.step-indicator {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  padding: 0.5rem 0;
  scrollbar-width: none;
}

.step-indicator::-webkit-scrollbar { display: none; }

.step-dot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  min-width: 60px;
  cursor: pointer;
}

.step-dot-circle {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  transition: var(--transition);
  color: var(--text-muted);
}

.step-dot.active .step-dot-circle {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
  box-shadow: var(--accent-glow);
}

.step-dot.completed .step-dot-circle {
  border-color: var(--success);
  background: rgba(0,200,83,0.15);
  color: var(--success);
}

.step-dot-label { font-size: 0.65rem; color: var(--text-muted); text-align: center; }
.step-dot.active .step-dot-label { color: var(--accent); }

.step-connector {
  flex: 1;
  height: 2px;
  background: var(--border-color);
  min-width: 20px;
  margin-bottom: 18px;
  transition: var(--transition);
}

.step-connector.completed { background: var(--success); }

/* ============================================================
   Components: SEO Score
   ============================================================ */
.seo-score-ring {
  width: 80px; height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  font-size: 1.4rem;
  font-weight: 800;
  position: relative;
  background: conic-gradient(var(--accent) calc(var(--score) * 3.6deg), var(--border-color) 0deg);
  padding: 4px;
}

.seo-score-ring-inner {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.seo-grade {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  font-weight: 800;
  font-size: 1rem;
}

.grade-a { background: rgba(0,200,83,0.2); color: #00C853; }
.grade-b { background: rgba(100,221,23,0.2); color: #64DD17; }
.grade-c { background: rgba(255,179,0,0.2); color: #FFB300; }
.grade-d { background: rgba(255,87,34,0.2); color: #FF5722; }
.grade-f { background: rgba(255,61,0,0.2); color: #FF3D00; }

/* ============================================================
   Components: Tags & Badges
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(var(--accent), 0.2);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-success { background: rgba(0,200,83,0.15); color: var(--success); }
.badge-warning { background: rgba(255,179,0,0.15); color: var(--warning); }
.badge-error { background: rgba(255,61,0,0.15); color: var(--error); }
.badge-info { background: rgba(41,121,255,0.15); color: var(--info); }

/* ============================================================
   Components: Modal
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

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

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.97);
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.modal-close { background: none; border: none; color: var(--text-secondary); cursor: pointer; font-size: 1.25rem; padding: 0.25rem; transition: var(--transition-fast); border-radius: var(--radius-sm); }
.modal-close:hover { color: var(--text-primary); background: var(--bg-secondary); }

/* ============================================================
   Components: Toast Notifications
   ============================================================ */
.toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  max-width: 400px;
  transform: translateX(120%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: all;
  font-size: 0.88rem;
  font-weight: 500;
}

.toast.show { transform: translateX(0); }
.toast-success { border-color: var(--success); }
.toast-error { border-color: var(--error); }
.toast-warning { border-color: var(--warning); }
.toast-icon { font-size: 1.1rem; flex-shrink: 0; }

/* ============================================================
   Components: Loading
   ============================================================ */
.loader {
  display: inline-flex;
  gap: 6px;
  align-items: center;
}

.loader-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: loaderBounce 1.2s ease-in-out infinite;
}

.loader-dot:nth-child(1) { animation-delay: 0s; }
.loader-dot:nth-child(2) { animation-delay: 0.2s; }
.loader-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes loaderBounce {
  0%, 80%, 100% { transform: scale(0); opacity: 0.5; }
  40% { transform: scale(1); opacity: 1; }
}

.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: skeletonLoad 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeletonLoad { to { background-position: -200% 0; } }

/* ============================================================
   Components: Section Headers
   ============================================================ */
.section {
  margin-bottom: 2.5rem;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.section-number {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--accent-dim);
  border: 2px solid var(--accent);
  color: var(--accent);
  font-weight: 800;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--accent-glow);
}

.section-title { font-size: 1.25rem; font-weight: 700; color: var(--text-primary); }
.section-subtitle { font-size: 0.85rem; color: var(--text-secondary); margin-top: 0.15rem; }

/* ============================================================
   Header & Navigation
   ============================================================ */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 1.5rem;
}

.app-header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
}

.logo-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--accent-glow);
}

.header-actions { display: flex; align-items: center; gap: 0.75rem; }

/* ============================================================
   Topic Navigation (Sticky Sidebar)
   ============================================================ */
.workflow-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
  align-items: start;
}

.workflow-sidebar {
  position: sticky;
  top: 80px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.sidebar-header {
  padding: 1rem 1.25rem;
  background: var(--accent-dim);
  border-bottom: 1px solid var(--border-color);
}

.sidebar-nav { padding: 0.5rem; }

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: 0.85rem;
  color: var(--text-secondary);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.sidebar-nav-item:hover { background: var(--bg-secondary); color: var(--text-primary); }
.sidebar-nav-item.active { background: var(--accent-dim); color: var(--accent); font-weight: 600; }

.sidebar-nav-item .nav-icon { width: 20px; text-align: center; }
.sidebar-nav-item .nav-check { margin-left: auto; color: var(--success); font-size: 0.75rem; opacity: 0; }
.sidebar-nav-item.completed .nav-check { opacity: 1; }

.workflow-main { min-width: 0; }

/* ============================================================
   Step Panels
   ============================================================ */
.step-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.step-panel.active { display: block; }

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

/* ============================================================
   Video Card Components
   ============================================================ */
.video-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.video-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md), 0 0 0 1px var(--accent-dim);
  transform: translateY(-3px);
}

.video-card.selected {
  border-color: var(--accent);
  box-shadow: var(--accent-glow);
}

.video-card.selected::after {
  content: '✓ 선택됨';
  position: absolute;
  top: 10px; right: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.video-thumbnail {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  background: var(--bg-secondary);
}

.video-info { padding: 0.85rem; }
.video-title { font-size: 0.88rem; font-weight: 600; margin-bottom: 0.4rem; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; gap: 0.75rem; font-size: 0.75rem; color: var(--text-muted); }
.video-views { color: var(--accent); font-weight: 600; }

/* ============================================================
   Image Generation Cards
   ============================================================ */
.image-card {
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-card);
}

.image-card:hover { border-color: var(--accent); transform: scale(1.02); }
.image-card.selected { border-color: var(--accent); box-shadow: var(--accent-glow); }

.image-preview {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  background: var(--bg-secondary);
  display: block;
}

.image-card-footer {
  padding: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

/* ============================================================
   Avatar Cards
   ============================================================ */
.avatar-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.avatar-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.avatar-card.selected { border-color: var(--accent); background: var(--accent-dim); box-shadow: var(--accent-glow); }

.avatar-emoji { font-size: 3rem; display: block; margin-bottom: 0.5rem; }
.avatar-name { font-weight: 700; font-size: 0.9rem; margin-bottom: 0.2rem; }
.avatar-desc { font-size: 0.75rem; color: var(--text-secondary); }

/* ============================================================
   Platform Buttons
   ============================================================ */
.platform-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  cursor: pointer;
  transition: var(--transition);
  min-width: 80px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.platform-btn.selected { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }
.platform-btn .platform-icon { font-size: 1.5rem; }

/* YouTube */
.platform-btn[data-platform="youtube"].selected { border-color: #FF0000; background: rgba(255,0,0,0.1); color: #FF0000; }
/* Instagram */
.platform-btn[data-platform="instagram"].selected { border-color: #E1306C; background: rgba(225,48,108,0.1); color: #E1306C; }
/* TikTok */
.platform-btn[data-platform="tiktok"].selected { border-color: #00F2EA; background: rgba(0,242,234,0.1); color: #00F2EA; }
/* Threads */
.platform-btn[data-platform="threads"].selected { border-color: #999; background: rgba(153,153,153,0.1); color: #999; }

/* ============================================================
   SEO Analysis Panel
   ============================================================ */
.seo-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.seo-metric {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.seo-metric:last-child { border-bottom: none; }
.seo-metric-label { font-size: 0.85rem; color: var(--text-secondary); }
.seo-metric-value { font-weight: 700; font-size: 0.9rem; }

.seo-bar { height: 6px; background: var(--border-color); border-radius: 3px; overflow: hidden; margin-top: 0.3rem; }
.seo-bar-fill { height: 100%; background: var(--accent); border-radius: 3px; transition: width 0.8s ease; }

/* ============================================================
   Timeline / Ad Placement
   ============================================================ */
.timeline {
  position: relative;
  height: 60px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.timeline-track {
  position: absolute;
  top: 50%;
  left: 5%;
  right: 5%;
  height: 4px;
  background: var(--border-color);
  transform: translateY(-50%);
  border-radius: 2px;
}

.timeline-marker {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 12px; height: 12px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg-card);
  cursor: pointer;
  transition: var(--transition);
}

.timeline-marker.active { background: var(--accent); box-shadow: var(--accent-glow); }

.timeline-label {
  position: absolute;
  top: 8px;
  transform: translateX(-50%);
  font-size: 0.65rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ============================================================
   File List
   ============================================================ */
.file-list { display: flex; flex-direction: column; gap: 0.5rem; }

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  gap: 0.75rem;
}

.file-item-name { font-size: 0.82rem; font-weight: 600; flex: 1; font-family: 'Courier New', monospace; color: var(--accent); }
.file-item-size { font-size: 0.75rem; color: var(--text-muted); }
.file-item-actions { display: flex; gap: 0.4rem; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .workflow-layout { grid-template-columns: 1fr; }
  .workflow-sidebar { position: static; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .container { padding: 0 1rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .btn-lg { padding: 0.75rem 1.5rem; font-size: 0.95rem; }
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }
}

@media (max-width: 480px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .step-indicator { display: none; }
}

/* ============================================================
   Utility Classes
   ============================================================ */
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }

.hidden { display: none !important; }
.visible { display: block !important; }
.opacity-50 { opacity: 0.5; }
.w-full { width: 100%; }

/* Divider */
.divider {
  height: 1px;
  background: var(--border-color);
  margin: 1.5rem 0;
}

/* Glow text effect */
.glow-text {
  text-shadow: 0 0 20px var(--accent), 0 0 40px var(--accent-dim);
}

/* Gradient text */
.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Pulse animation */
.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* Neon border */
.neon-border {
  border: 1px solid var(--accent);
  box-shadow: 0 0 10px var(--accent-dim), inset 0 0 10px var(--accent-dim);
}

/* Info box */
.info-box {
  background: rgba(41,121,255,0.1);
  border: 1px solid rgba(41,121,255,0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.info-box-icon { color: var(--info); flex-shrink: 0; font-size: 1rem; }

.warning-box {
  background: rgba(255,179,0,0.1);
  border: 1px solid rgba(255,179,0,0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}