/* Gmail Cleanup - Apple Style Design System */

/* ============================================
   DESIGN TOKENS
   ============================================ */

:root {
  /* Colors - Apple Palette */
  --apple-white: #ffffff;
  --apple-black: #1d1d1f;
  --apple-gray-dark: #424245;
  --apple-gray: #86868b;
  --apple-gray-light: #f5f5f7;
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --apple-blue-dark: #0051a3;
  
  /* Typography */
  --font-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-text: 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  
  /* Font Sizes */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 17px;
  --text-lg: 21px;
  --text-xl: 28px;
  --text-2xl: 40px;
  --text-3xl: 56px;
  --text-4xl: 80px;
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 64px;
  --spacing-2xl: 96px;
  
  /* Layout */
  --container-max: 1200px;
  --section-padding: 80px 0;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

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

body {
  font-family: var(--font-text);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--apple-black);
  background: var(--apple-white);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 700;
}

h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

p {
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--apple-gray-dark);
}

.text-large {
  font-size: var(--text-xl);
  line-height: 1.4;
}

.text-small {
  font-size: var(--text-sm);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--section-padding);
}

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

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-text);
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--apple-blue);
  color: var(--apple-white);
}

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

.btn-secondary {
  background: transparent;
  color: var(--apple-blue);
  border: 2px solid var(--apple-blue);
}

.btn-secondary:hover {
  background: var(--apple-blue);
  color: var(--apple-white);
}

.btn-large {
  padding: 18px 36px;
  font-size: var(--text-lg);
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  max-width: var(--container-max);
  margin: 0 auto;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--apple-black);
  text-decoration: none;
}

.nav-logo img {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  color: var(--apple-gray-dark);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--apple-black);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-md);
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(0, 113, 227, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.8s ease;
}

.hero p {
  font-size: var(--text-xl);
  color: var(--apple-gray-dark);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.4s both;
}

/* ============================================
   FEATURES SECTION
   ============================================ */

.features {
  background: var(--apple-white);
}

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

.feature-card {
  text-align: center;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-8px);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  background: linear-gradient(135deg, var(--apple-blue), var(--apple-blue-dark));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

.feature-card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--apple-black);
}

.feature-card p {
  font-size: var(--text-base);
  color: var(--apple-gray);
}

/* ============================================
   HOW IT WORKS
   ============================================ */

.how-it-works {
  background: var(--apple-gray-light);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.step {
  background: var(--apple-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--apple-blue);
  color: var(--apple-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.step h3 {
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   CTA SECTION
   ============================================ */

.cta-section {
  background: linear-gradient(135deg, var(--apple-blue), var(--apple-blue-dark));
  color: var(--apple-white);
  text-align: center;
}

.cta-section h2 {
  color: var(--apple-white);
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-lg);
}

.cta-section .btn-primary {
  background: var(--apple-white);
  color: var(--apple-blue);
}

.cta-section .btn-primary:hover {
  background: var(--apple-gray-light);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--apple-black);
  color: var(--apple-gray);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: var(--apple-white);
  margin-bottom: var(--spacing-sm);
  font-size: var(--text-base);
}

.footer-links {
  list-style: none;
}

.footer-links a {
  color: var(--apple-gray);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
  display: block;
  margin-bottom: var(--spacing-xs);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  text-align: center;
  font-size: var(--text-sm);
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.8s ease;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  :root {
    --text-4xl: 48px;
    --text-3xl: 36px;
    --text-2xl: 28px;
    --section-padding: 60px 0;
  }
  
  .hero h1 {
    font-size: var(--text-3xl);
  }
  
  .hero p {
    font-size: var(--text-base);
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .nav-links {
    display: none;
  }
  
  .features-grid,
  .steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .btn {
    width: 100%;
  }
}