/* ===== CSS Variables ===== */
:root {
  /* Colors - Ujamaa Palette */
  --color-primary: #2D5016;
  --color-secondary: #D4622A;
  --color-accent: #C9A227;
  --color-neutral-dark: #1A1A1A;
  --color-neutral-light: #F5F0EB;
  --color-success: #16A34A;
  --color-error: #DC2626;
  
  /* Typography - Chinese Optimized */
  --font-chinese: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-english: "Inter", "Source Sans Pro", system-ui, sans-serif;
  --font-heading: "Noto Serif SC", "ZCOOL XiaoWei", serif;
  
  --font-size-base: 16px;
  --font-size-base-chinese: 17px;
  --line-height-chinese: 1.8;
  
  /* Spacing */
  --container-max: 1200px;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Shadows & Borders */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --border-radius: 8px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

/* ===== Base Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-chinese);
  font-size: var(--font-size-base-chinese);
  line-height: var(--line-height-chinese);
  color: var(--color-neutral-dark);
  background: var(--color-neutral-light);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* ===== Utilities ===== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}
.section { padding: var(--spacing-xl) 0; }
.section-title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
  min-height: 48px;
}
.btn-primary {
  background: var(--color-primary);
  color: white;
}
.btn-primary:hover {
  background: #234012;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: white;
}
.btn-sm { padding: 0.5rem 1rem; min-height: 40px; font-size: 0.9rem; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: white;
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-md) 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}
.logo-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}
.logo-cn {
  font-family: var(--font-chinese);
  margin-left: 0.25rem;
  color: var(--color-secondary);
}
.logo-white { color: white; }
.logo-white .logo-cn { color: var(--color-accent); }

.menu-toggle {
  display: block;
  width: 40px;
  height: 40px;
  position: relative;
}
.hamburger, .hamburger::before, .hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--color-neutral-dark);
  left: 8px;
  transition: var(--transition-fast);
}
.hamburger { top: 19px; }
.hamburger::before { top: -8px; }
.hamburger::after { top: 8px; }

.main-nav {
  display: none;
  gap: var(--spacing-lg);
}
.main-nav a {
  color: var(--color-neutral-dark);
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast);
}
.main-nav a:hover, .main-nav a.active {
  border-color: var(--color-secondary);
  color: var(--color-primary);
}

.wechat-cta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: #07C160;
  color: white;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform var(--transition-fast);
}
.wechat-cta:hover { transform: translateY(-1px); }
.wechat-icon { width: 18px; height: 18px; }

/* ===== Language Switcher ===== */
.lang-switcher {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  z-index: 200;
}
.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  background: white;
  border: 1px solid #ddd;
  border-radius: 20px;
  font-size: 0.875rem;
  box-shadow: var(--shadow-sm);
}
.lang-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  display: none;
  flex-direction: column;
  overflow: hidden;
}
.lang-switcher:hover .lang-dropdown,
.lang-btn[aria-expanded="true"] + .lang-dropdown {
  display: flex;
}
.lang-dropdown a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  color: var(--color-neutral-dark);
  transition: background var(--transition-fast);
}
.lang-dropdown a:hover,
.lang-dropdown a.active {
  background: var(--color-neutral-light);
  color: var(--color-primary);
  font-weight: 600;
}
.flag { font-size: 1.1em; }
.arrow { font-size: 0.7em; transition: transform var(--transition-fast); }
.lang-btn[aria-expanded="true"] .arrow { transform: rotate(180deg); }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
  background-size: cover;
  background-position: center;
  padding: var(--spacing-xl) 0;
}
.hero-content {
  max-width: 700px;
  padding: var(--spacing-lg);
  background: rgba(0,0,0,0.3);
  border-radius: var(--border-radius);
}
.hero-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
}
.hero-subtitle {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
}
.trust-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  font-size: 0.9rem;
}
.trust-bar span {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.hero-ctas {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== China Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}
.feature-card {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.feature-icon { font-size: 2rem; margin-bottom: var(--spacing-sm); }
.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}
.feature-card p { font-size: 0.9rem; color: #666; }

/* ===== Packages ===== */
.packages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}
.package-card {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.package-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.package-card.featured {
  border: 2px solid var(--color-accent);
}
.package-image {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.package-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}
.package-card:hover .package-image img { transform: scale(1.05); }
.badge {
  position: absolute;
  top: var(--spacing-sm);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  color: white;
}
.featured-badge { left: var(--spacing-sm); background: var(--color-accent); }
.wildlife-badge { right: var(--spacing-sm); background: var(--color-primary); }
.photography-badge { right: var(--spacing-sm); background: var(--color-secondary); }
.cultural-badge { right: var(--spacing-sm); background: #7C3AED; }
.package-content { padding: var(--spacing-md); }
.package-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--color-neutral-dark);
}
.package-subtitle { font-size: 0.9rem; color: #666; margin-bottom: var(--spacing-sm); }
.package-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.875rem;
  color: #555;
  margin-bottom: var(--spacing-sm);
}
.package-price { margin: var(--spacing-sm) 0; }
.price-cny {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}
.price-usd { display: block; font-size: 0.9rem; color: #666; }
.rate-note { display: block; font-size: 0.75rem; color: #999; margin-top: 0.25rem; }
.ujamaa-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem;
  background: #FEF3C7;
  color: #92400E;
  border-radius: 4px;
  font-size: 0.8rem;
  margin: var(--spacing-sm) 0;
}
.package-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

/* ===== Ujamaa Section ===== */
.ujamaa-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}
.ujamaa-subtitle {
  font-size: 1.1rem;
  color: #555;
  margin-bottom: var(--spacing-lg);
  text-align: center;
}
.impact-dashboard {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}
.impact-item {
  text-align: center;
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}
.impact-number {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 0.25rem;
}
.impact-label { font-size: 0.875rem; color: #666; }
.ujamaa-visual {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.ujamaa-visual img { width: 100%; height: auto; display: block; }
.ujamaa-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: white;
  font-weight: 500;
}

/* ===== WeChat Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}
.modal[aria-hidden="false"] { opacity: 1; visibility: visible; }
.modal-content {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  max-width: 400px;
  width: 90%;
  text-align: center;
  position: relative;
}
.modal-close {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  font-size: 1.5rem;
  color: #666;
}
.modal-instructions {
  margin: var(--spacing-lg) 0;
  text-align: left;
  line-height: 1.6;
}
.qr-container { margin: var(--spacing-md) 0; }
.qr-code {
  width: 200px;
  height: 200px;
  border: 4px solid var(--color-primary);
  border-radius: var(--border-radius);
}
.wechat-id {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  font-size: 0.9rem;
}
.copy-btn {
  background: var(--color-primary);
  color: white;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-xl) 0 var(--spacing-md);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}
.footer-brand p { font-size: 0.9rem; opacity: 0.9; margin-bottom: var(--spacing-md); }
.payment-methods { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); }
.payment-badge {
  background: rgba(255,255,255,0.15);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
}
.footer-links h4, .footer-contact h4 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
}
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: var(--spacing-sm); }
.footer-links a { color: white; opacity: 0.9; transition: opacity var(--transition-fast); }
.footer-links a:hover { opacity: 1; }
.footer-contact p { font-size: 0.9rem; margin-bottom: var(--spacing-sm); opacity: 0.9; }
.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255,255,255,0.2);
  font-size: 0.85rem;
  opacity: 0.8;
}
.footer-bottom a { color: white; }

/* ===== Responsive ===== */
@media (min-width: 640px) {
  .features-grid { grid-template-columns: repeat(3, 1fr); }
  .impact-dashboard { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 1024px) {
  .menu-toggle { display: none; }
  .main-nav { display: flex; }
  .hero-title { font-size: 3.5rem; }
  .hero-subtitle { font-size: 1.25rem; }
  .features-grid { grid-template-columns: repeat(6, 1fr); }
  .ujamaa-grid { grid-template-columns: 1fr 1fr; }
  .package-actions { flex-direction: row; }
}

@media (max-width: 639px) {
  .btn { min-height: 52px; }
  .package-actions { flex-direction: column; }
  .package-actions .btn { width: 100%; }
}