/*
 * Harmonoise.com - Professional Audio Tools
 * Design System & Global Styles
 * No external dependencies - 100% vanilla CSS
 */

/* ========================================
   CSS RESET & BASE
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto',
               'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ========================================
   CSS VARIABLES - DESIGN TOKENS
   ======================================== */
:root {
  /* Colors - Dark Mode Default */
  --primary: #00E5FF;
  --primary-dark: #00B8CC;
  --primary-light: #33EBFF;

  --bg-primary: #121212;
  --bg-secondary: #1E1E1E;
  --bg-tertiary: #2A2A2A;

  --text-primary: #F0F0F0;
  --text-secondary: #B0B0B0;
  --text-muted: #707070;

  --border-color: #333333;
  --shadow-color: rgba(0, 0, 0, 0.5);

  --success: #4CAF50;
  --warning: #FFC107;
  --error: #F44336;
  --info: var(--primary);

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Typography Scale */
  --font-xs: 0.75rem;
  --font-sm: 0.875rem;
  --font-md: 1rem;
  --font-lg: 1.125rem;
  --font-xl: 1.25rem;
  --font-2xl: 1.5rem;
  --font-3xl: 2rem;
  --font-4xl: 2.5rem;
  --font-5xl: 3rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-toast: 400;

  /* Layout */
  --max-width: 1200px;
  --header-height: 70px;
  --touch-target: 44px;
}

/* Light Mode Theme */
[data-theme="light"] {
  --primary: #0099AA;
  --primary-dark: #007788;
  --primary-light: #00BBCC;

  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --bg-tertiary: #E8E8E8;

  --text-primary: #1A1A1A;
  --text-secondary: #4A4A4A;
  --text-muted: #909090;

  --border-color: #D0D0D0;
  --shadow-color: rgba(0, 0, 0, 0.1);
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

h1 { font-size: var(--font-4xl); }
h2 { font-size: var(--font-3xl); }
h3 { font-size: var(--font-2xl); }
h4 { font-size: var(--font-xl); }
h5 { font-size: var(--font-lg); }
h6 { font-size: var(--font-md); }

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

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

a:hover {
  color: var(--primary-light);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* ========================================
   LAYOUT COMPONENTS
   ======================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

.section-sm {
  padding: var(--space-2xl) 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
  display: flex;
  align-items: center;
  backdrop-filter: blur(10px);
  background-color: rgba(30, 30, 30, 0.9);
}

[data-theme="light"] .site-header {
  background-color: rgba(245, 245, 245, 0.9);
}

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

.logo {
  font-size: var(--font-2xl);
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo:hover {
  text-decoration: none;
  color: var(--primary-light);
}

/* Navigation */
.nav {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav a:hover {
  color: var(--primary);
  text-decoration: none;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-sm);
  min-width: var(--touch-target);
  min-height: var(--touch-target);
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    background-color: var(--bg-secondary);
    flex-direction: column;
    padding: var(--space-lg);
    box-shadow: -2px 0 10px var(--shadow-color);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    min-width: 250px;
  }

  .nav.open {
    transform: translateX(0);
  }
}

/* Footer */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-2xl) 0;
  margin-top: auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-xl);
}

.footer-section h4 {
  color: var(--primary);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-bottom {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-sm);
}

/* ========================================
   CARD COMPONENTS
   ======================================== */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px var(--shadow-color);
}

.card-title {
  font-size: var(--font-xl);
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.card-description {
  color: var(--text-secondary);
  font-size: var(--font-md);
}

/* Tool Grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.tool-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px var(--shadow-color);
  border-color: var(--primary);
  text-decoration: none;
}

.tool-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-lg);
  color: var(--primary);
}

.tool-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.tool-card p {
  color: var(--text-secondary);
  font-size: var(--font-sm);
}

/* ========================================
   BUTTON COMPONENTS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-md);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: var(--touch-target);
  min-width: var(--touch-target);
  font-family: inherit;
  text-decoration: none;
}

.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--primary);
  color: #000000;
}

.btn-primary:hover {
  background-color: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px var(--shadow-color);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

.btn-danger {
  background-color: var(--error);
  color: #FFFFFF;
}

.btn-danger:hover {
  background-color: #D32F2F;
}

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

.btn-large {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-lg);
  min-height: 56px;
}

.btn-icon {
  padding: var(--space-md);
  min-width: var(--touch-target);
}

/* ========================================
   FORM CONTROLS
   ======================================== */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
  font-weight: 600;
  font-size: var(--font-sm);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-md);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-md);
  font-family: inherit;
  transition: border-color var(--transition-fast);
  min-height: var(--touch-target);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.1);
}

/* Range Slider */
.range-group {
  margin-bottom: var(--space-lg);
}

.range-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
  font-weight: 600;
  font-size: var(--font-sm);
}

.range-value {
  color: var(--primary);
  font-weight: 700;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

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

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--primary);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

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

/* Radio Buttons */
.radio-group {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.radio-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: var(--touch-target);
}

.radio-label:hover {
  border-color: var(--primary);
}

input[type="radio"] {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

input[type="radio"]:checked {
  border-color: var(--primary);
}

input[type="radio"]:checked::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  background-color: var(--primary);
  border-radius: 50%;
}

input[type="radio"]:checked + .radio-label,
.radio-label:has(input[type="radio"]:checked) {
  background-color: rgba(0, 229, 255, 0.1);
  border-color: var(--primary);
}

/* ========================================
   THEME TOGGLE
   ======================================== */
.theme-toggle {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: var(--space-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: var(--touch-target);
  min-height: var(--touch-target);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
  border-color: var(--primary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  color: var(--text-primary);
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-muted { color: var(--text-muted) !important; }

.bg-primary { background-color: var(--bg-primary) !important; }
.bg-secondary { background-color: var(--bg-secondary) !important; }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
  text-align: center;
  padding: var(--space-3xl) 0;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero h1 {
  font-size: clamp(var(--font-3xl), 5vw, var(--font-5xl));
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: var(--font-xl);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

/* ========================================
   TOOL INTERFACE COMPONENTS
   ======================================== */
.tool-container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.tool-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.tool-interface {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.display-panel {
  background-color: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  margin-bottom: var(--space-lg);
}

.display-value {
  font-size: var(--font-4xl);
  font-weight: 700;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

.display-label {
  font-size: var(--font-sm);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: var(--space-sm);
}

/* Status Indicators */
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-md);
  font-size: var(--font-sm);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-muted);
}

.status-indicator.active .status-dot {
  background-color: var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
  :root {
    --font-4xl: 2rem;
    --font-3xl: 1.75rem;
    --font-2xl: 1.5rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

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

  .footer-content {
    flex-direction: column;
  }

  .tool-interface {
    padding: var(--space-lg);
  }
}

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

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-color: #FFFFFF;
  }

  [data-theme="light"] {
    --border-color: #000000;
  }
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
  .site-header,
  .site-footer,
  .theme-toggle,
  .menu-toggle {
    display: none;
  }

  body {
    background: white;
    color: black;
  }
}