/* VideoExtractor Pro - Web Design System */
:root {
  --bg-primary: #121212;
  --bg-surface: #1e1e1e;
  --bg-card: #2e2e2e;
  --bg-card-hover: #363636;
  --bg-input: #151515;
  --border-color: #3e3e3e;
  --border-hover: #555555;
  
  --accent-primary: #ff695b;
  --accent-hover: #e55648;
  --accent-secondary: #3a7ca5;
  --accent-secondary-hover: #2e6485;
  
  --text-primary: #f4f4f4;
  --text-muted: #9e9e9e;
  --text-subtle: #707070;
  
  --color-success: #4eba6f;
  --color-warning: #f5a623;
  --color-danger: #e74c3c;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px rgba(255, 105, 91, 0.25);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Navbar */
.site-header {
  background: rgba(30, 30, 30, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo-badge {
  background: var(--accent-primary);
  color: #fff;
  font-weight: 800;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--accent-primary);
}

.desktop-badge-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 105, 91, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(255, 105, 91, 0.3);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.desktop-badge-btn:hover {
  background: var(--accent-primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

/* Main Container */
.main-wrapper {
  flex: 1;
  max-width: 980px;
  margin: 2.5rem auto;
  padding: 0 1.25rem;
  width: 100%;
}

.hero-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hero-title {
  font-family: 'Outfit', sans-serif;
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.6rem;
  background: linear-gradient(135deg, #ffffff 40%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto;
}

/* Tabs Navigation */
.tabs-nav {
  display: flex;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.35rem;
  margin-bottom: 2rem;
  gap: 0.35rem;
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.tab-btn.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

/* Card Component */
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.input-row {
  display: flex;
  gap: 0.75rem;
}

.text-input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

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

.btn-secondary {
  background: #3a3a3a;
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: #4a4a4a;
}

.btn-success {
  background: var(--color-success);
  color: #fff;
}

.btn-success:hover {
  background: #3ea35e;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Video Preview Card */
.video-preview-card {
  display: flex;
  gap: 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
  align-items: center;
}

.preview-thumb {
  width: 220px;
  height: 125px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: #000;
  border: 1px solid var(--border-color);
}

.preview-info {
  flex: 1;
}

.preview-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.tag {
  background: rgba(58, 124, 165, 0.2);
  color: var(--accent-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(58, 124, 165, 0.3);
}

.preview-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Options Grid */
.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.select-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  cursor: pointer;
}

/* Progress Box */
.progress-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.progress-bar-container {
  height: 10px;
  background: #111;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-primary);
  width: 0%;
  transition: width 0.3s ease;
}

.progress-stats {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Download Result Box */
.result-box {
  background: rgba(78, 186, 111, 0.1);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-text {
  font-weight: 600;
  color: var(--color-success);
}

/* Desktop Promo Box */
.desktop-promo-card {
  background: linear-gradient(135deg, #1e1e1e 0%, #291c1b 100%);
  border: 1px solid rgba(255, 105, 91, 0.3);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
}

.promo-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.promo-desc {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 1.75rem;
}

/* Footer */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--accent-primary);
  text-decoration: none;
}

@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .input-row { flex-direction: column; }
  .video-preview-card { flex-direction: column; }
  .preview-thumb { width: 100%; height: auto; aspect-ratio: 16/9; }
  .header-nav .nav-link { display: none; }
}