assets/style.css

/* Modern TTS UI - Lightweight & Beautiful */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg: #0f172a;
  --bg-light: #1e293b;
  --surface: #334155;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #475569;
  --glass: rgba(255, 255, 255, 0.05);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --radius: 16px;
}

/* Mode Toggle Buttons */
.mode-btn {
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.mode-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.mode-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-color: transparent;
  color: white;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  padding: 20px;
  overflow-x: hidden;
}

/* Header */
h1 {
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  text-align: center;
}

.subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 0.95rem;
}

/* Layout */
.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

.col {
  background: var(--glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.col:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* Fieldset */
fieldset {
  border: none;
  margin-bottom: 20px;
  padding: 0;
}

legend {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

legend::before {
  content: "▶";
  font-size: 0.8rem;
  color: var(--secondary);
}

/* Inputs */
label {
  display: block;
  margin: 12px 0 6px;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 10px;
  outline: none;
  opacity: 0.8;
  transition: opacity 0.2s;
  cursor: pointer;
}

input[type="range"]:hover {
  opacity: 1;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  background: white;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: white;
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

input[type="text"],
input[type="file"],
select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 0.95rem;
  transition: all 0.2s;
}

input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

input[type="file"]::file-selector-button {
  padding: 8px 16px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  margin-right: 12px;
  transition: background 0.2s;
}

input[type="file"]::file-selector-button:hover {
  background: var(--primary-dark);
}

textarea {
  width: 100%;
  min-height: 120px;
  padding: 12px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
  transition: all 0.2s;
}

textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Checkboxes & Radio */
input[type="checkbox"],
input[type="radio"] {
  width: 18px;
  height: 18px;
  margin-right: 8px;
  cursor: pointer;
  accent-color: var(--primary);
}

/* Buttons */
button {
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
  position: relative;
  overflow: hidden;
}

button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

button:hover::before {
  left: 100%;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

button.secondary {
  background: var(--surface);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

button.secondary:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

/* Chips */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  margin: 4px;
  transition: all 0.2s;
}

.chip.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-color: transparent;
  color: white;
}

.chip::before {
  content: "●";
  font-size: 0.6rem;
}

.chip.success::before { color: var(--success); }
.chip.warning::before { color: var(--warning); }
.chip.danger::before { color: var(--danger); }

/* Audio Player */
audio {
  width: 100%;
  margin: 16px 0;
  border-radius: 10px;
  filter: hue-rotate(200deg);
}

/* Download Link */
a {
  display: inline-block;
  padding: 12px 24px;
  background: var(--success);
  color: white;
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

a:hover {
  background: #059669;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

/* Log Box */
.mono {
  font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-muted);
}

#log {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  max-height: 200px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}

#log::-webkit-scrollbar {
  width: 8px;
}

#log::-webkit-scrollbar-track {
  background: var(--bg-light);
  border-radius: 10px;
}

#log::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 10px;
}

/* Grid Layouts */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* Utilities */
.hidden { display: none !important; }
.muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }

/* Responsive */
@media (max-width: 768px) {
  .row {
    grid-template-columns: 1fr;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .col {
    padding: 16px;
  }

  h1 {
    font-size: 1.75rem;
  }
}

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

.col {
  animation: fadeIn 0.5s ease-out;
}

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

/* Loading Spinner */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* Toast/Status Messages */
.status-message {
  padding: 12px 20px;
  border-radius: 10px;
  margin: 12px 0;
  font-weight: 500;
  animation: fadeIn 0.3s ease-out;
}

.status-message.success {
  background: rgba(16, 185, 129, 0.2);
  border: 1px solid var(--success);
  color: var(--success);
}

.status-message.error {
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid var(--danger);
  color: var(--danger);
}

.status-message.info {
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid var(--primary);
  color: var(--primary);
}