/* ========================================
   🎨 SOUND EXTRACTOR - MODERN CSS DESIGN
   Mobile First + PC Friendly
======================================== */

/* ✅ Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Color Theme - Matching Index.css */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --secondary-color: hsl(258, 90%, 66%);
  --accent-color: #ec4899;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-color: #1e293b;
  --text-light: #64748b;
  --border-color: #e2e8f0;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========================================
   ⬅️ ENHANCED BACK BUTTON
======================================== */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--card-bg);
  color: var(--primary-color);
  text-decoration: none;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  margin: 4rem 2rem 2rem;
  position: relative;
  overflow: hidden;
  border: 2px solid transparent;
  width: fit-content;
}

.back-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
  transition: left 0.5s ease;
}

.back-btn:hover::before {
  left: 100%;
}

.back-btn:hover {
  background: var(--primary-color);
  color: white;
  transform: translateX(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.back-btn:active {
  transform: translateX(-3px) scale(0.98);
}


/* ========================================
   🎯 MAIN CONTENT
======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
  flex: 1;
}

main.container {
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  margin-top: 2rem;
  margin-bottom: 2rem;
}

main h1 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  text-align: center;
}

.subtitle {
  text-align: center;
  color: var(--text-light);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

/* ========================================
   🎬 TOOL CARD SECTION
======================================== */
.tool-card {
  background: var(--bg-color);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}

/* Upload Section */
.upload-section {
  margin-bottom: 1.5rem;
}

.upload-area {
  border: 3px dashed var(--primary-color);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  background: var(--card-bg);
  transition: all 0.3s ease;
  cursor: pointer;
}

.upload-area:hover {
  border-color: var(--primary-dark);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(168, 85, 247, 0.05) 100%);
  transform: translateY(-2px);
}

.upload-area.drag-over {
  border-color: var(--success-color);
  background: rgba(16, 185, 129, 0.1);
}

.upload-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.upload-area h3 {
  color: var(--text-color);
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.upload-area p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.browse-btn {
  padding: 0.75rem 2rem;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
}

.browse-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Preview Section */
.preview-section {
  margin-bottom: 1.5rem;
}

.video-preview {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.video-preview video {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: 8px;
  margin: 0 auto;
  display: block;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

.file-info {
  background: var(--bg-color);
  padding: 1rem;
  border-radius: 8px;
  margin-top: 1rem;
}

.file-info p {
  margin: 0.5rem 0;
  color: var(--text-color);
  font-size: 0.95rem;
}

.file-info strong {
  color: var(--primary-color);
  margin-right: 0.5rem;
}

/* Progress Section */
.progress-section {
  margin-bottom: 1.5rem;
}

.progress-container {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.progress-bar {
  width: 100%;
  height: 30px;
  background: var(--bg-color);
  border-radius: 15px;
  overflow: hidden;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 1rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--success-color) 100%);
  width: 0%;
  transition: width 0.3s ease;
  border-radius: 15px;
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 1.5s infinite;
}

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

.progress-text {
  text-align: center;
  color: var(--text-color);
  font-weight: 600;
  font-size: 1rem;
}

/* Action Buttons */
.action-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.action-btn {
  padding: 1rem 2rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  flex: 1;
  min-width: 200px;
}

.extract-btn {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
}

.extract-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.download-btn {
  background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
  color: white;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.reset-btn {
  background: linear-gradient(135deg, var(--text-light) 0%, var(--text-color) 100%);
  color: white;
}

.reset-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ========================================
   📖 HOW TO USE SECTION
======================================== */
.how-to-use {
  margin-top: 3rem;
}

.how-to-use h2 {
  color: var(--primary-color);
  text-align: center;
  margin-bottom: 2rem;
  font-size: 2rem;
}

.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.step-card {
  background: linear-gradient(135deg, var(--card-bg) 0%, var(--bg-color) 100%);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.step-number {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

.step-card h3 {
  color: var(--text-color);
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.step-card p {
  color: var(--text-light);
  font-size: 1rem;
  line-height: 1.6;
}

/* Features Section */
.features-section {
  background: var(--bg-color);
  padding: 2rem;
  border-radius: 12px;
  margin-bottom: 2rem;
}

.features-section h3 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.features-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.features-list li {
  padding: 0.75rem;
  background: var(--card-bg);
  border-radius: 8px;
  color: var(--text-color);
  font-size: 1rem;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.features-list li:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-lg);
}

/* FAQ Section */
.faq-section {
  background: var(--bg-color);
  padding: 2rem;
  border-radius: 12px;
}

.faq-section h3 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.faq-item {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.faq-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.faq-item h4 {
  color: var(--text-color);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.faq-item p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ========================================
   👣 FOOTER STYLES
======================================== */
.pro-footer {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  color: #e2e8f0;
  padding: 3rem 1rem 1rem;
  margin-top: auto;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
  color: white;
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.footer-brand {
  text-align: center;
}

.footer-brand img {
  width: 200px;
  height: auto;
  border-radius: 12px;
  margin-bottom: 1rem;
  margin-top: 2rem;
}

.footer-brand p {
  color: #94a3b8;
  font-size: 0.95rem;
  margin-top: 0rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: #cbd5e1;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: var(--primary-color);
}

.contact p {
  margin-bottom: 0.5rem;
  color: #cbd5e1;
}

.contact small {
  display: block;
  color: #94a3b8;
  font-size: 0.8rem;
  margin-top: -0.25rem;
  margin-bottom: 0.5rem;
}

.footer-bottom {
  border-top: 1px solid #475569;
  padding-top: 1.5rem;
  text-align: center;
}

.footer-bottom p {
  color: #94a3b8;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.copyright-warning {
  font-size: 0.8rem;
  color: #64748b;
  margin-top: 0.5rem;
}

/* ========================================
   📱 RESPONSIVE DESIGN - TABLETS
======================================== */
@media (min-width: 640px) {
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .features-list {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-container {
    grid-template-columns: repeat(2, 1fr);
  }
  
  main h1 {
    font-size: 2.25rem;
  }
}

/* ========================================
   💻 RESPONSIVE DESIGN - DESKTOP
======================================== */
@media (min-width: 768px) {
  .logo-name {
    font-size: 1.5rem;
  }
  
  nav a {
    font-size: 1rem;
    padding: 0.6rem 1.25rem;
  }
  
  main h1 {
    font-size: 2.5rem;
  }
  
  .tool-card {
    padding: 2.5rem;
  }
  
  .footer-container {
    grid-template-columns: repeat(3, 1fr);
    text-align: left;
  }
  
  .footer-brand {
    text-align: left;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 2.5rem 2rem;
  }
  
  main.container {
    padding: 3rem 2.5rem;
  }
  
  main h1 {
    font-size: 3rem;
  }
  
  .subtitle {
    font-size: 1.2rem;
  }
}

/* ========================================
   ✨ ANIMATIONS & EFFECTS
======================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main {
  animation: fadeIn 0.6s ease;
}

.step-card {
  animation: fadeIn 0.6s ease backwards;
}

.step-card:nth-child(1) { animation-delay: 0.1s; }
.step-card:nth-child(2) { animation-delay: 0.2s; }
.step-card:nth-child(3) { animation-delay: 0.3s; }

/* ========================================
   🎯 ACCESSIBILITY
======================================== */
*:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================================
   📝 BLOG CTA
======================================== */
.blog-cta {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 2px solid var(--primary-color);
  border-radius: 12px;
  padding: 2.5rem;
  text-align: center;
}

.blog-cta-content h3 {
  font-size: 1.8rem;
  color: var(--text-color);
  margin-bottom: 1rem;
  font-weight: 700;
}

.blog-cta-content p {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.blog-btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  text-decoration: none;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.blog-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}