/* ============================================
   影视大全 Landing Page Stylesheet
   ============================================ */

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

:root {
  /* Brand colors */
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #e8f0fe;
  --accent: #fbbc04;
  --accent-red: #ea4335;

  /* Neutrals */
  --bg: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-dark: #1a1a2e;
  --text: #202124;
  --text-secondary: #5f6368;
  --text-light: #ffffff;
  --border: #e0e0e0;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial,
    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: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);

  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: var(--transition);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.navbar-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.navbar-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text);
}

.navbar-download-btn {
  display: inline-flex;
  align-items: center;
  padding: var(--space-sm) var(--space-lg);
  background: var(--primary);
  color: var(--text-light);
  text-decoration: none;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: var(--transition);
}

.navbar-download-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(64px + var(--space-4xl)) var(--space-lg) var(--space-4xl);
  overflow: hidden;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(251, 188, 4, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(26, 115, 232, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%);
  animation: heroBgPulse 8s ease-in-out infinite alternate;
}

@keyframes heroBgPulse {
  0% { opacity: 0.8; }
  100% { opacity: 1; }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero-logo-wrapper {
  margin-bottom: var(--space-xl);
  animation: floatIn 0.8s ease-out;
}

.hero-logo {
  width: 140px;
  height: 140px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  object-fit: cover;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  color: var(--text-light);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-sm);
  font-weight: 500;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-desc {
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: var(--space-2xl);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-download-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  background: var(--accent);
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius-full);
  font-size: var(--font-size-lg);
  font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(251, 188, 4, 0.4);
  animation: fadeInUp 0.8s ease-out 0.5s both;
}

.hero-download-btn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 8px 30px rgba(251, 188, 4, 0.5);
}

.hero-download-btn:active {
  transform: translateY(-1px) scale(1.01);
}

.btn-icon {
  width: 22px;
  height: 22px;
}

.hero-hint {
  margin-top: var(--space-md);
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: scale(0.8) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* ============================================
   Features Section
   ============================================ */
.features {
  padding: var(--space-4xl) 0;
  background: var(--bg-secondary);
}

.section-title {
  text-align: center;
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--text);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.section-desc {
  text-align: center;
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-3xl);
}

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

.feature-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  color: var(--primary);
  transition: var(--transition);
}

.feature-card:hover .feature-icon {
  background: var(--primary);
  color: var(--text-light);
  transform: scale(1.05);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-sm);
}

.feature-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   CTA Section
   ============================================ */
.cta {
  padding: var(--space-4xl) 0;
  background: linear-gradient(135deg, #1a73e8 0%, #764ba2 100%);
  text-align: center;
}

.cta-content {
  max-width: 600px;
  margin: 0 auto;
}

.cta-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--text-light);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.cta-desc {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-2xl);
}

.cta-download-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  background: var(--text-light);
  color: var(--primary);
  text-decoration: none;
  border-radius: var(--radius-full);
  font-size: var(--font-size-lg);
  font-weight: 700;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
}

.cta-download-btn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: var(--shadow-xl);
}

.cta-download-btn:active {
  transform: translateY(-1px) scale(1.01);
}

.cta-download-btn .btn-icon {
  width: 24px;
  height: 24px;
}

.cta-hint {
  margin-top: var(--space-md);
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: var(--space-2xl) 0;
  background: var(--bg-dark);
  text-align: center;
}

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

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

.footer-logo {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.footer-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-light);
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
}

.footer-disclaimer {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.35);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .hero {
    padding: calc(64px + var(--space-2xl)) var(--space-md) var(--space-2xl);
    min-height: auto;
  }

  .hero-logo {
    width: 110px;
    height: 110px;
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-lg);
  }

  .hero-download-btn {
    padding: var(--space-sm) var(--space-xl);
    font-size: var(--font-size-base);
  }

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

  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .feature-card {
    padding: var(--space-xl);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

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

  .cta-title {
    font-size: var(--font-size-2xl);
  }

  .navbar-title {
    font-size: var(--font-size-base);
  }

  .navbar-download-btn {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-xs);
  }
}

/* ============================================
   Scroll animations
   ============================================ */
.feature-card {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
}