/* ==========================================================================
   AI TEXT TO SPEECH - STYLESHEET
   High-performance, mobile-first, zero-framework CSS design system
   WCAG 2.1 AAA Compliant, ultra-fast rendering, zero layout shifts
   ========================================================================== */

:root {
  /* Color Palette - Refined Slate & Electric Indigo Theme */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: #161f33;
  --bg-card-hover: #1c2742;
  --bg-surface: #1e293b;
  --bg-glass: rgba(22, 31, 51, 0.85);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0b0f19;

  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-secondary: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  --accent-glow: rgba(79, 70, 229, 0.25);
  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --accent-error: #ef4444;

  --border-subtle: #1e293b;
  --border-card: #273552;
  --border-focus: #6366f1;

  /* Typography */
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Sizing & Spacing */
  --container-max: 1200px;
  --container-wide: 1400px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 30px -4px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 24px rgba(79, 70, 229, 0.3);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Light Theme Variables (Toggleable via data-theme="light") */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-surface: #e2e8f0;
  --bg-glass: rgba(255, 255, 255, 0.9);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --border-subtle: #e2e8f0;
  --border-card: #cbd5e1;
  --border-focus: #4f46e5;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.15);
}

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

html {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-primary);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-primary);
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

/* Accessibility: Focus visible */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent-primary);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  z-index: 9999;
  font-weight: 600;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 1rem;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.container-wide {
  max-width: var(--container-wide);
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  width: 2.25rem;
  height: 2.25rem;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.logo-badge {
  font-size: 0.65rem;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  background: rgba(79, 70, 229, 0.2);
  color: #818cf8;
  border: 1px solid rgba(129, 140, 248, 0.3);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-card-hover);
}

.nav-link.active {
  color: var(--accent-primary);
  font-weight: 600;
  background-color: rgba(79, 70, 229, 0.08);
}

.nav-link-badge {
  font-size: 0.7rem;
  background: var(--accent-gradient);
  color: #ffffff;
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  line-height: 1;
}

.nav-divider {
  width: 1px;
  height: 1.75rem;
  background-color: var(--border-subtle);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.theme-toggle-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
  width: 2.35rem;
  height: 2.35rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
  transform: scale(1.05);
}

.btn-header-cta {
  background: var(--accent-primary);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.btn-header-cta:hover {
  background: var(--accent-primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  width: 2.35rem;
  height: 2.35rem;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
}

/* Hero Section */
.hero-section {
  padding: 3.5rem 0 2.5rem;
  position: relative;
  text-align: center;
}

.hero-badge-container {
  display: flex;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: rgba(79, 70, 229, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #818cf8;
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-success);
  box-shadow: 0 0 8px var(--accent-success);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.btn-hero-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.85rem 1.85rem;
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.35);
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79, 70, 229, 0.5);
  color: #ffffff;
}

.btn-hero-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-card);
  font-weight: 600;
  font-size: 1.05rem;
  padding: 0.85rem 1.65rem;
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-hero-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-2px);
  color: var(--text-primary);
}

/* Homepage Voice Sample Audition Bar */
.audition-preview-section {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  max-width: 960px;
  margin: 0 auto 3.5rem;
  text-align: left;
  box-shadow: var(--shadow-md);
}

.audition-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.audition-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.audition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.sample-audition-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.75rem;
  transition: all var(--transition-fast);
}

.sample-audition-card:hover {
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
}

.sample-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sample-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-secondary);
  text-transform: uppercase;
}

.sample-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.sample-audition-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  cursor: pointer;
  width: fit-content;
  transition: all var(--transition-fast);
}

.sample-audition-btn:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.sample-audition-btn.playing {
  background: var(--accent-success);
  color: #ffffff;
  border-color: var(--accent-success);
}

/* Call to Action Banner */
.cta-banner-card {
  background: var(--accent-gradient);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  text-align: center;
  color: #ffffff;
  box-shadow: var(--shadow-glow);
  margin: 4rem 0;
}

.cta-banner-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 1rem;
  color: #ffffff;
}

.cta-banner-subtitle {
  font-size: 1.1rem;
  max-width: 620px;
  margin: 0 auto 2rem;
  opacity: 0.92;
  color: #ffffff;
}

.btn-banner-white {
  background: #ffffff;
  color: #1e1b4b;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-banner-white:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  color: #0f172a;
}

/* ==========================================================================
   PRIMARY TOOL DECK COMPONENT
   ========================================================================== */
.tool-container {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  margin-bottom: 3.5rem;
  position: relative;
  transition: border-color var(--transition-fast);
}

.tool-container:focus-within {
  border-color: var(--border-focus);
}

/* Tool Top Toolbar */
.tool-toolbar-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.preset-selector-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.toolbar-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.preset-chip {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.preset-chip:hover, .preset-chip.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.tool-utility-btns {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-icon-util {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon-util:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-card);
}

/* Main Textarea Area */
.tool-input-area {
  position: relative;
  padding: 1.5rem;
  background: var(--bg-card);
}

.tts-textarea {
  width: 100%;
  min-height: 170px;
  max-height: 400px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.15rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  font-family: inherit;
}

.tts-textarea::placeholder {
  color: var(--text-muted);
}

/* Real-Time Word Highlighting / Karaoke Mode Overlay */
.karaoke-display {
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  right: 1.5rem;
  bottom: 3rem;
  pointer-events: none;
  color: transparent;
  font-size: 1.15rem;
  line-height: 1.6;
  overflow-y: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  display: none;
}

.karaoke-display.active {
  display: block;
  background: var(--bg-card);
}

.karaoke-word {
  color: var(--text-muted);
  transition: all 0.1s ease;
  border-radius: 3px;
  padding: 0 1px;
}

.karaoke-word.active {
  color: #ffffff;
  background: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
  font-weight: 700;
}

.karaoke-word.spoken {
  color: var(--text-secondary);
}

/* Text Meta Info Bar */
.tool-input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.char-counter-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-success);
}

/* Visualizer Canvas */
.visualizer-strip {
  height: 48px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#audioVisualizer {
  width: 100%;
  height: 100%;
  display: block;
}

.tool-input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.char-word-stats, .char-counter-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.stat-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-surface);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.stat-badge strong {
  color: var(--accent-secondary);
  font-family: var(--font-mono);
  font-weight: 700;
}

.privacy-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-success);
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-success);
}

/* Dynamic Audio Harmonic Visualizer Deck */
.visualizer-deck, .visualizer-strip {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.visualizer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.visualizer-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.visualizer-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all var(--transition-fast);
}

.visualizer-dot.active {
  background: var(--accent-secondary);
  box-shadow: 0 0 10px var(--accent-secondary);
  animation: pulseDot 1.5s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.visualizer-status-text {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.75px;
}

.visualizer-canvas-wrapper {
  width: 100%;
  height: 60px;
  display: flex;
  align-items: center;
}

.audio-canvas, #audioVisualizer {
  width: 100%;
  height: 100%;
  display: block;
}

/* Controls Deck */
.tool-controls-deck {
  padding: 1.5rem;
  background: var(--bg-secondary);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  align-items: start;
}

.control-card, .control-group {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.control-card.voice-select-card {
  grid-column: 1 / -1;
}

@media (min-width: 768px) {
  .control-card.voice-select-card {
    grid-column: span 2;
  }
}

.control-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.control-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
}

.control-val, .control-val-badge {
  color: var(--accent-secondary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
}

.voice-badge-count {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.12);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
}

.select-wrapper, .voice-select-wrapper {
  position: relative;
  width: 100%;
}

.custom-voice-dropdown, .form-select, .voice-select {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
}

.custom-voice-dropdown:hover, .custom-voice-dropdown:focus,
.voice-select:hover, .voice-select:focus,
.form-select:hover, .form-select:focus {
  border-color: var(--border-focus);
}

/* Range Slider Styling */
.custom-range-slider, .range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-surface);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.custom-range-slider::-webkit-slider-thumb, .range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 2px solid #ffffff;
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.4);
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.custom-range-slider::-moz-range-thumb, .range-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 2px solid #ffffff;
  cursor: pointer;
}

.custom-range-slider::-webkit-slider-thumb:hover, .range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  background: var(--accent-secondary);
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: -0.2rem;
}

/* Quick Speed Presets */
.speed-presets-bar, .quick-speed-pills {
  display: flex;
  gap: 0.35rem;
  margin-top: 0.25rem;
}

.speed-pill {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-fast);
}

.speed-pill:hover, .speed-pill.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

/* Action Execution Bar */
.tool-action-bar {
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.primary-playback-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-speak-main {
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  box-shadow: var(--shadow-glow);
  transition: all var(--transition-fast);
}

.btn-speak-main:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(79, 70, 229, 0.5);
}

.btn-control-secondary {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.btn-control-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
}

.btn-control-secondary:disabled, .btn-speak-main:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.secondary-download-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-download-audio {
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid rgba(6, 182, 212, 0.4);
  color: #22d3ee;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.btn-download-audio:hover {
  background: rgba(6, 182, 212, 0.25);
  border-color: #06b6d4;
  color: #ffffff;
  transform: translateY(-1px);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  pointer-events: auto;
  animation: slideInToast 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.toast-success {
  border-left: 4px solid var(--accent-success);
}
.toast.toast-error {
  border-left: 4px solid var(--accent-error);
}
.toast.toast-info {
  border-left: 4px solid var(--accent-secondary);
}

@keyframes slideInToast {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   FEATURES / TRUST / STATS GRID
   ========================================================================== */
.feature-strip-section {
  padding: 3rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-focus);
}

.feature-icon-box {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  background: rgba(79, 70, 229, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #818cf8;
  margin-bottom: 1.25rem;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   DEEP SEO CONTENT SECTION (1500+ Words Structure)
   ========================================================================== */
.seo-content-article {
  padding: 4.5rem 0;
}

.article-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3rem;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-secondary);
  margin-bottom: 0.5rem;
  display: block;
}

.section-heading {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.content-block {
  max-width: 880px;
  margin: 0 auto 3.5rem;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.content-block h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.content-block h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.75rem 0 0.75rem;
}

.content-block p {
  margin-bottom: 1.25rem;
}

.content-block ul, .content-block ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.content-block li {
  margin-bottom: 0.5rem;
}

/* Comparison Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-card);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
  background: var(--bg-card);
}

.comparison-table th, .comparison-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.comparison-table th {
  background: var(--bg-secondary);
  font-weight: 700;
  color: var(--text-primary);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:hover td {
  background: var(--bg-card-hover);
}

/* Step-by-Step Guide Cards */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: relative;
}

.step-number {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #ffffff;
  font-weight: 800;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

/* ==========================================================================
   FAQ ACCORDION COMPONENT
   ========================================================================== */
.faq-section {
  padding: 4rem 0;
  background: var(--bg-secondary);
}

.faq-accordion-list {
  max-width: 840px;
  margin: 2rem auto 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--border-focus);
}

.faq-summary {
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon-chevron {
  transition: transform var(--transition-fast);
  color: var(--accent-secondary);
}

.faq-item[open] .faq-icon-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1.5rem 1.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   DIRECTORY / CATEGORIES / TOOL CARDS
   ========================================================================== */
.directory-section {
  padding: 4rem 0;
}

.directory-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  justify-content: center;
}

.filter-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
  text-decoration: none;
  color: inherit;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.tool-card-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-secondary);
  margin-bottom: 0.5rem;
}

.tool-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.tool-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
}

/* ==========================================================================
   BLOG & ARTICLE FORMATS
   ========================================================================== */
.blog-article-container {
  max-width: 800px;
  margin: 3rem auto;
  padding: 0 1.25rem;
}

.blog-meta-header {
  margin-bottom: 2.5rem;
  text-align: center;
}

.blog-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-primary);
  margin: 1rem 0;
}

.blog-author-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.author-avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
}

/* Form Styles */
.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  max-width: 640px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--border-focus);
}

/* ==========================================================================
   FOOTER COMPONENT
   ========================================================================== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 1rem;
  max-width: 320px;
  line-height: 1.6;
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  gap: 1rem;
}

/* ==========================================================================
   RESPONSIVE DESIGN BREAKPOINTS
   ========================================================================== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 900px) {
  .nav-divider {
    display: none;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 4.5rem;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-card);
    flex-direction: column;
    padding: 1.25rem 1.5rem;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }

  .nav-links.mobile-open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border-radius: var(--radius-md);
  }

  .mobile-menu-btn {
    display: flex;
  }
}

@media (max-width: 768px) {
  .hero-section {
    padding: 2rem 0 1.5rem;
  }

  .tool-controls-deck {
    grid-template-columns: 1fr;
  }

  .tool-action-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .primary-playback-group, .secondary-download-group {
    width: 100%;
    justify-content: stretch;
  }

  .btn-speak-main, .btn-download-audio, .btn-control-secondary {
    flex: 1;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .tool-toolbar-top {
    padding: 0.75rem 1rem;
  }

  .tool-input-area, .tool-controls-deck, .tool-action-bar {
    padding: 1rem;
  }

  .preset-selector-group {
    overflow-x: auto;
    padding-bottom: 0.25rem;
  }
}