/* ============================================
   瓜朋 Guapeng - Trae 风格设计系统
   ============================================ */

/* CSS Variables */
:root {
  /* Brand Colors */
  --color-primary: #45B746;
  --color-primary-light: #6BC76C;
  --color-primary-dark: #3A9E3B;
  --color-secondary: #FFA0B4;
  --color-accent: #FFD042;

  /* Background Colors */
  --color-bg-dark: #0a0f0a;
  --color-bg-darker: #060906;
  --color-bg-card: #111811;
  --color-bg-card-hover: #1a221a;
  --color-bg-light: #F8FBF8;
  --color-bg-section: #f0f5f0;

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #9ca3af;
  --color-text-muted: #6b7280;
  --color-text-dark: #1a1a1a;
  --color-text-dark-secondary: #4a4a4a;

  /* Border Colors */
  --color-border: rgba(69, 183, 70, 0.15);
  --color-border-light: rgba(255, 255, 255, 0.06);
  --color-border-hover: rgba(69, 183, 70, 0.3);

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
  --space-2xl: 120px;

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

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.15);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 40px rgba(69, 183, 70, 0.15);
  --shadow-glow-strong: 0 0 60px rgba(69, 183, 70, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--color-text-primary);
  background-color: var(--color-bg-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ============================================
   Typography
   ============================================ */

.text-display {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.text-h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.text-h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 600;
  line-height: 1.3;
}

.text-h3 {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 600;
  line-height: 1.4;
}

.text-body {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.text-caption {
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text-muted);
}

/* ============================================
   Navigation
   ============================================ */

.nav-trae {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  background: transparent;
  transition: background var(--transition-normal), backdrop-filter var(--transition-normal);
}

.nav-trae.scrolled {
  background: rgba(10, 15, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

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

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 4px 16px rgba(69, 183, 70, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-light);
  box-shadow: 0 6px 24px rgba(69, 183, 70, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  padding: 8px 16px;
}

.btn-ghost:hover {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* ============================================
   Cards
   ============================================ */

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-normal);
}

.card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.card-glass {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

/* ============================================
   Sections
   ============================================ */

.section-dark {
  background: var(--color-bg-dark);
  color: var(--color-text-primary);
}

.section-light {
  background: var(--color-bg-light);
  color: var(--color-text-dark);
}

.section-gradient {
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-bg-card) 100%);
}

/* ============================================
   Hero Section
   ============================================ */

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

.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(69, 183, 70, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-glow-1 {
  top: -200px;
  right: -100px;
}

.hero-glow-2 {
  bottom: -200px;
  left: -100px;
  background: radial-gradient(circle, rgba(255, 160, 180, 0.1) 0%, transparent 70%);
}

/* ============================================
   Feature Grid
   ============================================ */

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

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

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

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(69, 183, 70, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.feature-icon i {
  font-size: 1.5rem;
  color: var(--color-primary);
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--color-bg-dark);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.footer-column h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.footer-links li {
  margin-bottom: var(--space-xs);
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  max-width: 1200px;
  margin: var(--space-xl) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  text-align: center;
}

.footer-copyright {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer-beian {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-beian a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

/* ============================================
   Animations
   ============================================ */

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }

/* ============================================
   Utility Classes
   ============================================ */

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

.text-center { text-align: center; }
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.pt-xl { padding-top: var(--space-xl); }
.pb-xl { padding-bottom: var(--space-xl); }

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

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

  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (max-width: 640px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }
}

/* ============================================
   Scrollbar Styling
   ============================================ */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}