* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

:root {
  --sky-blue: #00c4ff;
  --sky-pink: #ff005e;
  --sky-green: #00ffb3;
  --sky-blue-light: rgba(0, 196, 255, 0.1);
  --sky-pink-light: rgba(255, 0, 94, 0.1);
  --sky-green-light: rgba(0, 255, 179, 0.1);
  --light-bg: #ffffff;
  --card-bg: #f8f9fa;
  --card-hover: #f1f3f4;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-tertiary: #9aa0a6;
  --border-light: #dadce0;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.12);
}

body {
  background: var(--light-bg);
  color: var(--text-primary);
  line-height: 1;
  padding: 10px;
}

.container {
  width: 100%;        /* full width by default */
  max-width: 500px;   /* restrict max width */
  margin: 0 auto;     /* center it */
  padding: 10px;
}


/* Hero Section */
.hero-section {
  text-align: center;
  margin-bottom: 10px;
  padding: 70px 0;
}

.hero-section h1 {
  font-size: 1.5rem;
  margin-bottom: 10px;
  background: linear-gradient(90deg, var(--sky-blue), var(--sky-pink), var(--sky-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.hero-section p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto;
}

.gradient-bar {
  height: 3px;
  width: 300px;
  background: linear-gradient(90deg, var(--sky-blue), var(--sky-pink), var(--sky-green));
  margin: 10px auto 15px;
  border-radius: 2px;
}

/* Upload Section */
.upload-section {
  margin: 10px 0;
  text-align: center;
}

.upload-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
  border: 2px dashed var(--sky-blue);
  border-radius: 12px;
  padding: 30px 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  min-height: 200px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.upload-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--sky-blue), var(--sky-pink), var(--sky-green));
}

.upload-box:hover {
  background: var(--sky-blue-light);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.upload-icon {
  font-size: 48px;
  margin-bottom: 10px;
  color: var(--sky-blue);
  transition: all 0.3s ease;
}

.upload-box:hover .upload-icon {
  color: var(--sky-pink);
  transform: scale(1.1);
}

.upload-content p {
  margin: 5px 0;
  font-size: 1.1rem;
}

.upload-content strong {
  color: var(--text-primary);
}

.upload-content small {
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

#audioFiles {
  display: none;
}

/* Upload Button Style */
.upload-button {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 30px;
  background: linear-gradient(90deg, var(--sky-blue), var(--sky-pink));
  color: white;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.upload-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--sky-pink), var(--sky-green), var(--sky-blue));
  transition: left 0.5s ease;
  z-index: -1;
}

.upload-button:hover::before {
  left: 0;
}

.upload-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

/* File List Section */
.file-list-section {
  margin: 40px 0;
  display: none;
}

.file-list {
  list-style: none;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 15px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.file-list li {
  background: var(--light-bg);
  margin: 10px 0;
  padding: 15px;
  border-radius: 6px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
  border-left: 4px solid var(--sky-blue);
}

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

.file-list li span {
  color: var(--text-primary);
  font-weight: 500;
}

.file-list li button {
  background: var(--sky-pink);
  border: none;
  padding: 8px 15px;
  color: #fff;
  border-radius: 5px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
}

.file-list li button:hover {
  background: var(--sky-blue);
  transform: translateY(-2px);
}

/* Format Selection Section */
.format-section {
  margin: 40px 0;
  text-align: center;
  display: none;
}

.format-select-container {
  position: relative;
  display: inline-block;
  max-width: 300px;
  width: 100%;
}

.format-select-container select {
  width: 100%;
  padding: 15px 20px;
  border: 2px solid var(--border-light);
  border-radius: 8px;
  background: var(--light-bg);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
  appearance: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  min-height: 50px;
}

.format-select-container select:focus {
  outline: none;
  border-color: var(--sky-blue);
  box-shadow: 0 0 0 3px var(--sky-blue-light);
}

.format-select-container select:hover {
  border-color: var(--sky-blue);
}

.format-select-container i {
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

/* Optional: Better formatting for long option text */
.format-select-container option {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-light);
}

.format-select-container option:last-child {
  border-bottom: none;
}


/* Actions Section */
.player-section {
  margin: 40px 0;
  text-align: center;
  display: none;
}

.buttons {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-top: 20px;
}

.buttons button {
  padding: 12px 25px;
  border: none;
  background: var(--sky-blue);
  color: white;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 600;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.buttons button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--sky-pink), var(--sky-green), var(--sky-blue));
  transition: left 0.5s ease;
  z-index: -1;
}

.buttons button:hover::before {
  left: 0;
}

.buttons button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

/* Steps Section */
.steps-section {
  margin: 50px 0;
}

.section-title {
  font-size: 1.8rem;
  text-align: center;
  margin: 40px 0 30px;
  position: relative;
  color: var(--text-primary);
  font-weight: 600;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--sky-blue), var(--sky-pink), var(--sky-green));
  margin: 15px auto 0;
  border-radius: 2px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.step-card {
  background: var(--light-bg);
  padding: 25px 20px;
  border-radius: 12px;
  text-align: center;
  transition: all 0.3s ease;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.step-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--sky-blue), var(--sky-pink), var(--sky-green));
}

.step-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.step-icon {
  font-size: 2.5rem;
  margin-bottom: 15px;
  color: var(--sky-blue);
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.step-card:hover .step-icon {
  color: var(--sky-pink);
  transform: scale(1.05);
}

.step-card h3 {
  margin-bottom: 12px;
  color: var(--text-primary);
  font-size: 1.2rem;
  font-weight: 600;
}

.step-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.4;
}

/* FAQ Section */
.faq-section {
  margin: 50px 0;
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--light-bg);
  margin-bottom: 12px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.faq-item:hover {
  background: var(--card-hover);
}

.faq-question {
  padding: 18px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.faq-question:hover {
  color: var(--sky-blue);
}

.faq-question i {
  transition: transform 0.3s ease;
  color: var(--sky-pink);
}

.faq-answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.9rem;
}

.faq-item.active .faq-answer {
  padding: 0 20px 18px;
  max-height: 500px;
}

.faq-item.active .faq-question i {
  transform: rotate(45deg);
}

/* Animation for page load */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.5s ease forwards;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 10px;
  }
  
  .hero-section h1 {
    font-size: 1.7rem;
  }
  
  .section-title {
    font-size: 1.5rem;
    margin: 30px 0 20px;
  }
  
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .buttons {
    flex-direction: column;
    gap: 10px;
  }
  
  .buttons button {
    width: 100%;
  }
  
  .upload-box {
    padding: 30px 15px;
    min-height: 180px;
  }
  
  .upload-icon {
    font-size: 40px;
  }
  
  .upload-button {
    width: 100%;
    padding: 15px;
  }
  
  .file-list li {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
  
  .format-select-container {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-section h1 {
    font-size: 1.5rem;
  }
  
  .hero-section p {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.3rem;
  }
}