/* ================================
   AI Mix Advisor - Professional Audio Plugin Website
   Design System: Research-based from Splice/Plugin Boutique
   ================================ */

/* ================================
   Typography - Inter Variable
   ================================ */
@import url('https://rsms.me/inter/inter.css');

:root {
  /* Fonts */
  --font-family-base: 'InterVariable', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  /* Audio Meter Colors (Industry Standard) */
  --meter-green: #00C853;
  --meter-amber: #FFC107;
  --meter-red: #F44336;
  --meter-peak: #D32F2F;

  /* Brand */
  --brand-primary: #00BCD4;

  /* Dark Mode (Default) */
  --bg-base: #121212;
  --bg-surface-1: #1E1E1E;
  --bg-surface-2: #2C2C2C;
  --text-primary: #FFFFFF;
  --text-secondary: #B3B3B3;
  --text-tertiary: #808080;

  /* Accents */
  --accent-success: var(--meter-green);
  --accent-warning: var(--meter-amber);
  --accent-error: var(--meter-red);
  --accent-info: #2196F3;

  /* Focus */
  --focus-color: #F6AD55;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* Borders */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ================================
   Focus Indicators (WCAG AAA)
   ================================ */
*:focus-visible {
  outline: 3px solid var(--focus-color);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

/* ================================
   Typography Scale
   ================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(32px, 8vw, 72px);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: clamp(24px, 5vw, 40px);
  margin-bottom: var(--spacing-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(20px, 3vw, 28px);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

h4 {
  font-size: 20px;
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

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

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--meter-green);
}

code {
  font-family: 'JetBrains Mono', 'Monaco', 'Courier New', monospace;
  font-size: 14px;
  background-color: var(--bg-surface-2);
  padding: 2px 6px;
  border-radius: 3px;
}

/* ================================
   Container & Grid
   ================================ */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-products {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

/* ================================
   Header
   ================================ */
.header {
  position: sticky;
  top: 0;
  background-color: rgba(18, 18, 18, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-lg) 0;
  z-index: 1000;
}

.header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.header__nav {
  display: flex;
  gap: var(--spacing-xl);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* ================================
   Hero Section
   ================================ */
.hero {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

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

.hero__title {
  font-size: clamp(48px, 10vw, 72px);
  font-weight: 700;
  background: linear-gradient(135deg, var(--brand-primary), var(--meter-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
}

.hero__subtitle {
  font-size: clamp(20px, 3vw, 28px);
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  font-weight: 500;
}

.hero__description {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

.hero__compatibility {
  font-size: 14px;
  color: var(--text-tertiary);
}

/* ================================
   Buttons
   ================================ */
.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--border-radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.btn--primary {
  background-color: var(--brand-primary);
  color: var(--bg-base);
}

.btn--primary:hover {
  background-color: var(--meter-green);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background-color: var(--bg-surface-1);
  color: var(--text-primary);
  border: 2px solid var(--bg-surface-2);
}

.btn--secondary:hover {
  background-color: var(--bg-surface-2);
  border-color: var(--brand-primary);
}

.btn--large {
  padding: 16px 48px;
  font-size: 18px;
}

.btn--full {
  width: 100%;
}

/* ================================
   Sections
   ================================ */
section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--text-primary);
}

/* ================================
   Features Section
   ================================ */
.features {
  background-color: var(--bg-surface-1);
}

/* ================================
   Card Component
   ================================ */
.card {
  background-color: var(--bg-surface-1);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-xl);
  transition: all 0.2s ease;
}

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

.card__icon {
  width: 48px;
  height: 48px;
  color: var(--brand-primary);
  margin-bottom: var(--spacing-lg);
}

.card__title {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.card__description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ================================
   Download Section
   ================================ */
.download__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  max-width: 1000px;
  margin: 0 auto;
}

.download__card {
  background-color: var(--bg-surface-1);
  border: 2px solid var(--brand-primary);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-xl);
  text-align: center;
}

.download__card h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.download__size {
  color: var(--text-tertiary);
  font-size: 14px;
  margin-bottom: var(--spacing-lg);
}

.download__note {
  margin-top: var(--spacing-md);
  font-size: 14px;
  color: var(--text-tertiary);
}

.download__requirements {
  background-color: var(--bg-surface-1);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-xl);
}

.download__requirements h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.download__requirements h4:first-child {
  margin-top: 0;
}

.requirements-list {
  list-style: none;
  padding-left: 0;
}

.requirements-list li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
  color: var(--text-secondary);
  position: relative;
}

.requirements-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--meter-green);
  font-weight: 600;
}

/* ================================
   Installation Section
   ================================ */
.installation {
  background-color: var(--bg-surface-1);
}

.doc-section {
  background-color: var(--bg-base);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-xl);
}

.doc-section h3 {
  color: var(--text-primary);
}

.steps-list {
  padding-left: var(--spacing-lg);
  color: var(--text-secondary);
}

.steps-list li {
  margin-bottom: var(--spacing-sm);
}

.location-list {
  list-style: none;
  padding-left: 0;
}

.location-list li {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.location-list strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.api-links {
  list-style: none;
  padding-left: 0;
}

.api-links li {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.api-links strong {
  color: var(--text-primary);
  margin-right: var(--spacing-sm);
}

.note {
  font-size: 14px;
  color: var(--text-tertiary);
  font-style: italic;
  margin-top: var(--spacing-md);
}

/* ================================
   FAQ
   ================================ */
.faq {
  margin-top: var(--spacing-3xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.faq h3 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.faq-item {
  background-color: var(--bg-surface-1);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  cursor: pointer;
}

.faq-item summary {
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

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

.faq-item summary::before {
  content: "+";
  display: inline-block;
  width: 24px;
  margin-right: var(--spacing-sm);
  color: var(--brand-primary);
  font-weight: 700;
  font-size: 20px;
}

.faq-item[open] summary::before {
  content: "−";
}

.faq-item p {
  margin-top: var(--spacing-md);
  padding-left: 32px;
  color: var(--text-secondary);
}

/* ================================
   Footer
   ================================ */
.footer {
  background-color: var(--bg-surface-2);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.footer__content {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
}

.footer__logo {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.footer__description {
  color: var(--text-tertiary);
  font-size: 14px;
}

.footer__links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.footer__column h4 {
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.footer__column a {
  display: block;
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: var(--spacing-sm);
  transition: color 0.2s ease;
}

.footer__column a:hover {
  color: var(--brand-primary);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
}

.footer__bottom p {
  color: var(--text-tertiary);
  font-size: 14px;
  margin: 0;
}

/* ================================
   Responsive Design (Mobile-First)
   ================================ */

/* Mobile: 320px - 767px */
@media (max-width: 767px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .header__nav {
    display: none;
  }

  .hero {
    padding: var(--spacing-2xl) 0;
  }

  .hero__cta {
    flex-direction: column;
  }

  .btn--large {
    width: 100%;
  }

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

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

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

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

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

/* Tablet: 768px - 1023px */
@media (min-width: 768px) and (max-width: 1023px) {
  .grid-products {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
  section {
    padding: var(--spacing-3xl) 0;
  }
}

/* Large Desktop: 1400px+ */
@media (min-width: 1400px) {
  .container {
    max-width: 1600px;
  }

  .grid-products {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  }
}

/* ================================
   Print Styles
   ================================ */
@media print {
  body {
    background-color: white;
    color: black;
  }

  .header,
  .footer {
    display: none;
  }
}