/* ========================================
   DriftBreath - Main Stylesheet
   Premium sleep-focused design
   ======================================== */

/* ----------------------------------------
   CSS Custom Properties (Design Tokens)
   ---------------------------------------- */
:root {
  /* Colors */
  --color-bg: #0A0A0A;
  --color-surface: #141414;
  --color-border: #1F1F1F;
  --color-gold: #D4A84B;
  --color-gold-light: #E8C878;
  --color-gold-dim: #8B7434;
  --color-text: #F5F5F5;
  --color-text-secondary: #A0A0A0;
  --color-text-muted: #666666;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-3xl: 96px;
  --space-4xl: 128px;

  /* Layout */
  --max-width: 1120px;
  --border-radius: 12px;
  --border-radius-sm: 8px;

  /* Transitions */
  --transition: all 0.3s ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

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

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

a:hover {
  color: var(--color-gold-light);
}

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

/* ----------------------------------------
   Typography
   ---------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
}

h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
}

h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: var(--space-lg);
}

h3 {
  font-size: clamp(20px, 2.5vw, 24px);
}

p {
  margin-bottom: var(--space-sm);
}

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

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

.text-center {
  text-align: center;
}

/* ----------------------------------------
   Layout & Container
   ---------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

@media (min-width: 768px) {
  section {
    padding: var(--space-3xl) 0;
  }
}

/* ----------------------------------------
   Buttons
   ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--color-gold) 0%, #B8923F 100%);
  color: var(--color-bg);
  box-shadow: 0 4px 24px rgba(212, 168, 75, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 32px rgba(212, 168, 75, 0.4);
  color: var(--color-bg);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
}

.btn-secondary:hover {
  background: rgba(212, 168, 75, 0.1);
  color: var(--color-gold-light);
}

/* App Store Button */
.btn-appstore {
  background: var(--color-text);
  color: var(--color-bg);
  padding: 12px 24px;
  border-radius: 10px;
}

.btn-appstore:hover {
  background: #E0E0E0;
  color: var(--color-bg);
  transform: translateY(-2px);
}

.btn-appstore svg {
  width: 24px;
  height: 24px;
}

/* ----------------------------------------
   Logo
   ---------------------------------------- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
}

.logo svg {
  width: 40px;
  height: 40px;
}

.logo:hover {
  color: var(--color-text);
}

/* ----------------------------------------
   Hero Section
   ---------------------------------------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(212, 168, 75, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero .logo {
  margin-bottom: var(--space-xl);
  justify-content: center;
  font-size: 28px;
}

.hero h1 {
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-gold-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(18px, 2.5vw, 22px);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  margin-bottom: var(--space-2xl);
}

.hero-image {
  max-width: 280px;
  margin: 0 auto;
  border-radius: var(--space-lg);
  box-shadow: 0 0 80px rgba(212, 168, 75, 0.15);
}

/* ----------------------------------------
   How It Works Section
   ---------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.step {
  text-align: center;
  padding: var(--space-lg);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gold) 0%, #B8923F 100%);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 20px;
  margin-bottom: var(--space-md);
}

.step h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-gold-light);
}

.step p {
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* ----------------------------------------
   Features Section
   ---------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--color-gold-dim);
  transform: translateY(-4px);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: var(--space-sm);
}

.feature-card h3 {
  margin-bottom: var(--space-xs);
  font-size: 20px;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 16px;
  margin-bottom: 0;
}

/* ----------------------------------------
   Premium Section
   ---------------------------------------- */
.premium {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 50%, var(--color-bg) 100%);
}

.premium-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.premium .logo {
  margin-bottom: var(--space-lg);
  justify-content: center;
}

.premium h2 {
  margin-bottom: var(--space-xs);
}

.premium-subtitle {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.premium-features {
  text-align: left;
  margin-bottom: var(--space-xl);
}

.premium-features li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  font-size: 18px;
  border-bottom: 1px solid var(--color-border);
}

.premium-features li:last-child {
  border-bottom: none;
}

.premium-features .check {
  color: var(--color-gold);
  font-size: 20px;
  flex-shrink: 0;
}

/* ----------------------------------------
   FAQ Section
   ---------------------------------------- */
.faq-list {
  max-width: 800px;
  margin: var(--space-xl) auto 0;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 18px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

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

.faq-question:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

.faq-icon {
  font-size: 24px;
  color: var(--color-gold);
  transition: var(--transition);
  flex-shrink: 0;
}

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

.faq-answer {
  display: none;
  padding-bottom: var(--space-md);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ----------------------------------------
   Footer
   ---------------------------------------- */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer .logo {
  margin-bottom: var(--space-lg);
  justify-content: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 14px;
}

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

.footer-contact {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: var(--space-md);
}

.footer-contact a {
  color: var(--color-text-secondary);
}

.footer-copyright {
  color: var(--color-text-muted);
  font-size: 12px;
}

/* ----------------------------------------
   Legal Pages (Privacy, Terms)
   ---------------------------------------- */
.legal-page {
  padding: var(--space-3xl) 0;
}

.legal-page .container {
  max-width: 800px;
}

.legal-page h1 {
  font-size: clamp(32px, 4vw, 48px);
  margin-bottom: var(--space-xs);
}

.legal-date {
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

.legal-content h2 {
  font-size: 24px;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  color: var(--color-gold-light);
}

.legal-content h3 {
  font-size: 20px;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.legal-content p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.legal-content ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: var(--space-md);
}

.legal-content li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
  color: var(--color-text-secondary);
}

.legal-content li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-gold);
}

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

.legal-disclaimer {
  margin-top: var(--space-xl);
  padding: var(--space-md);
  background: var(--color-surface);
  border-left: 3px solid var(--color-gold);
  border-radius: var(--border-radius-sm);
  font-style: italic;
  color: var(--color-text-secondary);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  color: var(--color-text-secondary);
  font-size: 14px;
}

.back-link:hover {
  color: var(--color-gold);
}

/* ----------------------------------------
   Utilities
   ---------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ----------------------------------------
   Responsive Adjustments
   ---------------------------------------- */
@media (max-width: 768px) {
  body {
    font-size: 16px;
  }

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

  .hero {
    min-height: auto;
    padding: var(--space-3xl) 0;
  }

  .hero-image {
    max-width: 220px;
  }

  .steps {
    gap: var(--space-md);
  }

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

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

  .premium-features li {
    font-size: 16px;
  }

  .faq-question {
    font-size: 16px;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

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

  html {
    scroll-behavior: auto;
  }
}