/* Apple-style CSS for Alpha 影控 Website */

/* CSS Variables for consistent theming */
:root {
  /* Colors */
  --primary-blue: #007AFF;
  --primary-blue-hover: #0056CC;
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --background-primary: #ffffff;
  --background-secondary: #f5f5f7;
  --background-tertiary: #fbfbfd;
  --border-color: #d2d2d7;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  
  /* Typography */
  --font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --background-primary: #000000;
    --background-secondary: #1c1c1e;
    --background-tertiary: #2c2c2e;
    --border-color: #38383a;
    --shadow-light: rgba(255, 255, 255, 0.1);
    --shadow-medium: rgba(255, 255, 255, 0.15);
  }
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

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

/* Navigation */
.navbar {
  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 var(--border-color);
  transition: var(--transition-base);
}

@media (prefers-color-scheme: dark) {
  .navbar {
    background: rgba(0, 0, 0, 0.8);
  }
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  font-size: var(--font-size-2xl);
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 400;
  transition: var(--transition-fast);
}

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

.download-btn {
  background: var(--primary-blue);
  color: white !important;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-weight: 500;
  transition: var(--transition-fast);
}

.download-btn:hover {
  background: var(--primary-blue-hover);
  transform: translateY(-1px);
}

/* Hero Section */
.hero {
  padding: calc(70px + var(--spacing-4xl)) var(--spacing-lg) var(--spacing-4xl);
  background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.5;
}

.hero-features {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.feature-icon {
  font-size: var(--font-size-lg);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
}

.cta-button {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-xl);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-base);
  border: 2px solid transparent;
}

.cta-button.primary {
  background: var(--primary-blue);
  color: white;
}

.cta-button.primary:hover {
  background: var(--primary-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--shadow-medium);
}

.cta-button.secondary {
  background: transparent;
  color: var(--primary-blue);
  border-color: var(--primary-blue);
}

.cta-button.secondary:hover {
  background: var(--primary-blue);
  color: white;
  transform: translateY(-2px);
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-screenshot {
  max-width: 300px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-2xl);
  box-shadow: 0 20px 40px var(--shadow-medium);
  transition: var(--transition-slow);
}

.hero-screenshot:hover {
  transform: scale(1.05) rotateY(5deg);
  box-shadow: 0 30px 60px var(--shadow-medium);
}

/* Section Styles */
.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-4xl) var(--spacing-lg);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-4xl);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

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

/* Features Section */
.features {
  background: var(--background-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-2xl);
}

.feature-card {
  background: var(--background-primary);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-2xl);
  box-shadow: 0 4px 20px var(--shadow-light);
  transition: var(--transition-base);
  border: 1px solid var(--border-color);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--shadow-medium);
}

.feature-icon-large {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-lg);
}

.feature-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.feature-description {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Screenshots Section */
.screenshots {
  background: var(--background-primary);
}

.screenshots-gallery {
  display: flex;
  gap: var(--spacing-xl);
  overflow-x: auto;
  padding-bottom: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
  scrollbar-width: thin; /* For Firefox */
  scrollbar-color: var(--border-color) var(--background-secondary); /* For Firefox */
}

.screenshots-gallery::-webkit-scrollbar {
  height: 8px;
}

.screenshots-gallery::-webkit-scrollbar-track {
  background: var(--background-secondary);
  border-radius: 10px;
}

.screenshots-gallery::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 10px;
  border: 2px solid var(--background-secondary);
}

.screenshot {
  max-height: 500px;
  width: auto;
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 25px var(--shadow-light);
  transition: var(--transition-base);
}

.screenshot:hover {
  transform: scale(1.03);
  box-shadow: 0 12px 35px var(--shadow-medium);
}

.screenshots-text-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  padding-top: var(--spacing-2xl);
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-2xl);
}

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

.screenshot-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.screenshot-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* Compatibility Section */
.compatibility {
  background: var(--background-secondary);
}

.compatibility-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.camera-series {
  background: var(--background-primary);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: 0 4px 20px var(--shadow-light);
  border: 1px solid var(--border-color);
}

.series-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.camera-list {
  list-style: none;
}

.camera-list li {
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

.camera-list li:last-child {
  border-bottom: none;
}

.compatibility-note {
  background: var(--background-tertiary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  text-align: center;
}

.compatibility-note p {
  margin-bottom: var(--spacing-sm);
}

.compatibility-note p:last-child {
  margin-bottom: 0;
}

/* Download Section */
.download {
  background: linear-gradient(135deg, var(--primary-blue) 0%, #0056CC 100%);
  color: white;
}

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

.download-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: white;
  margin-bottom: var(--spacing-lg);
}

.download-subtitle {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-2xl);
}

.download-buttons {
  margin-bottom: var(--spacing-lg);
}

.download-btn.app-store {
  display: inline-block;
  padding: 0;
  background: transparent;
  border: none;
  transition: var(--transition-base);
}

.download-btn.app-store:hover {
  transform: scale(1.05);
}

.download-btn.app-store img {
  height: 60px;
  width: auto;
}

.download-note {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
}

/* Footer */
.footer {
  background: var(--background-primary);
  border-top: 1px solid var(--border-color);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-2xl);
  align-items: center;
}

.footer-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.footer-description {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

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

.footer-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  transition: var(--transition-fast);
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--spacing-md);
  }
  
  .nav-links {
    display: none;
  }
  
  .hero {
    padding: calc(70px + var(--spacing-2xl)) var(--spacing-md) var(--spacing-2xl);
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    text-align: center;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-features {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .section-container {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  .compatibility-grid {
    grid-template-columns: 1fr;
  }
  
  .download-title {
    font-size: var(--font-size-3xl);
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .screenshots-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-features {
    flex-direction: column;
    gap: var(--spacing-md);
  }
}

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

.feature-card {
  animation: fadeInUp 0.6s ease-out forwards;
}

.screenshot-item {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* Smooth scroll padding for fixed header */
html {
  scroll-padding-top: 70px;
}