/* ==========================================
   西藏导游网 - 设计系统
   xizang.xzyzauto.com
   西藏迎昭旅行社
   ========================================== */

/* --- CSS Variables (Design System) --- */
:root {
  /* Colors - Tibetan theme */
  --color-primary: #C41E3A;       /* Tibetan Red */
  --color-primary-dark: #9B1B30;
  --color-accent: #D4A843;        /* Tibetan Gold */
  --color-accent-light: #E8C96A;
  --color-sky: #1E90FF;           /* Tibet Sky Blue */
  --color-sky-dark: #1565C0;
  --color-sage: #7CB342;          /* Highland green */
  --color-text: #2C2C2C;
  --color-text-light: #666;
  --color-text-lighter: #999;
  --color-bg: #FDF8F0;            /* Warm parchment */
  --color-bg-alt: #FFF9E6;
  --color-white: #FFFFFF;
  --color-border: #E8E0D0;
  --color-overlay: rgba(0,0,0,0.5);

  /* 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);

  /* Typography */
  --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Noto Serif SC', Georgia, serif;

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

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
  --radius: 8px;
  --radius-lg: 12px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-primary-dark); }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 700; line-height: 1.3; }

ul { list-style: none; }

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

/* --- Navigation --- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex; align-items: center;
}

.navbar .container {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%;
}

.nav-logo {
  display: flex; align-items: center; gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: 1.25rem; font-weight: 700;
  color: var(--color-primary);
}

.nav-logo img { height: 40px; width: auto; }

.nav-logo span { display: inline; }

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

.nav-links a {
  font-size: 0.95rem; font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; right: 0;
  height: 2px; background: var(--color-primary);
  transform: scaleX(0); transition: transform 0.2s;
}

.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }

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

.nav-toggle { display: none; flex-direction: column; gap: 4px; cursor: pointer; background: none; border: none; padding: 4px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--color-text); transition: 0.2s; }

/* --- Hero Section --- */
.hero {
  margin-top: var(--nav-height);
  min-height: 85vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  color: var(--color-white);
  position: relative;
  background-size: cover; background-position: center;
}

.hero::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.3) 100%);
}

.hero-content { position: relative; z-index: 1; max-width: 800px; padding: var(--space-lg); }

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: var(--space-md);
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  opacity: 0.95;
  margin-bottom: var(--space-lg);
}

.hero-badge {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-text);
  padding: 0.25rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-align: center;
}

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

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

.btn-accent {
  background: var(--color-accent);
  color: var(--color-text);
}

.btn-accent:hover { background: var(--color-accent-light); transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn-outline:hover { background: rgba(255,255,255,0.1); }

/* --- Section --- */
.section { padding: var(--space-xl) 0; }

.section-alt { background: var(--color-bg-alt); }

.section-title {
  text-align: center;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  font-size: 1.05rem;
}

/* --- Service Cards --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.service-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
  border: 1px solid var(--color-border);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.service-card-img {
  height: 200px;
  background-size: cover; background-position: center;
}

.service-card-body { padding: var(--space-lg); }

.service-card-body h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.service-card-body p { color: var(--color-text-light); font-size: 0.95rem; margin-bottom: var(--space-md); }

.service-card-body .btn { font-size: 0.9rem; padding: 0.5rem 1.5rem; }

/* --- Route Cards (product cards) --- */
.route-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.route-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s;
}

.route-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.route-card-img {
  height: 200px;
  background-size: cover; background-position: center;
  position: relative;
}

.route-card-tag {
  position: absolute;
  top: var(--space-md); left: var(--space-md);
  background: var(--color-primary);
  color: var(--color-white);
  padding: 0.2rem 0.8rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

.route-card-body { padding: var(--space-lg); }

.route-card-body h3 { font-size: 1.15rem; margin-bottom: var(--space-sm); }

.route-card-meta {
  display: flex; gap: var(--space-md);
  font-size: 0.85rem; color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.route-card-meta i { margin-right: 4px; }

.route-card-price {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: var(--space-sm) 0;
}

.route-card-price small {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--color-text-light);
}

/* --- Blog Cards --- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.blog-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s;
}

.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.blog-card-img { height: 200px; background-size: cover; background-position: center; }

.blog-card-body { padding: var(--space-lg); }

.blog-card-date { font-size: 0.8rem; color: var(--color-text-lighter); margin-bottom: var(--space-sm); }

.blog-card-body h3 { font-size: 1.1rem; margin-bottom: var(--space-sm); line-height: 1.4; }

.blog-card-body p { color: var(--color-text-light); font-size: 0.9rem; }

/* --- Destination Cards --- */
.dest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.dest-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 320px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
}

.dest-card:hover { transform: scale(1.03); box-shadow: var(--shadow-lg); }

.dest-card-img {
  width: 100%; height: 100%;
  background-size: cover; background-position: center;
  transition: transform 0.5s;
}

.dest-card:hover .dest-card-img { transform: scale(1.1); }

.dest-card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(transparent 40%, rgba(0,0,0,0.8));
}

.dest-card-info {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: var(--space-lg);
  color: var(--color-white);
}

.dest-card-info h3 { font-size: 1.4rem; margin-bottom: 4px; }

.dest-card-info p { font-size: 0.85rem; opacity: 0.85; }

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about-img {
  border-radius: var(--radius-lg);
  height: 450px;
  background-size: cover; background-position: center;
}

.about-text h2 {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.about-text p { margin-bottom: var(--space-md); color: var(--color-text-light); }

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

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

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-heading);
}

.stat-label { font-size: 0.85rem; color: var(--color-text-light); }

/* --- Reviews / Testimonials --- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-lg);
}

.review-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.review-header {
  display: flex; align-items: center; gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.review-avatar {
  width: 56px; height: 56px;
  border-radius: 50%;
  background-size: cover; background-position: center;
  background-color: var(--color-border);
}

.review-name { font-weight: 600; }

.review-date { font-size: 0.8rem; color: var(--color-text-lighter); }

.review-stars { color: var(--color-accent); font-size: 0.9rem; }

.review-text { color: var(--color-text-light); font-style: italic; line-height: 1.7; }

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.contact-info h3 { margin-bottom: var(--space-md); color: var(--color-primary); }

.contact-item {
  display: flex; align-items: flex-start; gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.contact-item i {
  font-size: 1.3rem;
  color: var(--color-primary);
  width: 24px; text-align: center;
  margin-top: 3px;
}

.contact-form { background: var(--color-white); padding: var(--space-lg); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); }

.form-group { margin-bottom: var(--space-md); }

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color 0.2s;
  background: var(--color-white);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(196,30,58,0.1);
}

.form-group textarea { resize: vertical; min-height: 100px; }

/* --- Footer --- */
.footer {
  background: #1a1a2e;
  color: rgba(255,255,255,0.8);
  padding: var(--space-xl) 0 var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
}

.footer h4 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
  font-size: 1rem;
}

.footer p { font-size: 0.9rem; line-height: 1.8; }

.footer-links a {
  display: block;
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  padding: 0.3rem 0;
  transition: color 0.2s;
}

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

.footer-contact-item {
  display: flex; gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
}

.footer-contact-item i { color: var(--color-accent); margin-top: 3px; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}

/* --- Breadcrumb --- */
.breadcrumb {
  background: var(--color-bg-alt);
  padding: calc(var(--nav-height) + var(--space-md)) 0 var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-list {
  display: flex; gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.breadcrumb-list a { color: var(--color-text-lighter); }

.breadcrumb-list span { color: var(--color-primary); font-weight: 500; }

.breadcrumb-list li:not(:last-child)::after { content: '/'; margin-left: var(--space-sm); color: var(--color-text-lighter); }

/* --- Page Header --- */
.page-header {
  margin-top: var(--nav-height);
  padding: var(--space-xl) 0;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-white);
  text-align: center;
}

.page-header h1 { font-size: clamp(1.8rem, 3vw, 2.5rem); margin-bottom: var(--space-sm); }
.page-header p { opacity: 0.9; font-size: 1.05rem; }

/* --- Detail Page --- */
.detail-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.detail-hero {
  margin-top: var(--nav-height);
  min-height: 50vh;
  display: flex; align-items: flex-end;
  background-size: cover; background-position: center;
  position: relative;
  color: var(--color-white);
}

.detail-hero::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(transparent 30%, rgba(0,0,0,0.8));
}

.detail-hero-content {
  position: relative;
  z-index: 1;
  padding: var(--space-xl) var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.detail-hero h1 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
.detail-hero p { opacity: 0.9; }

.detail-body { padding: var(--space-xl) var(--space-md); max-width: 900px; margin: 0 auto; }

.detail-body h2 { color: var(--color-primary); margin: var(--space-lg) 0 var(--space-md); font-size: 1.4rem; }
.detail-body h3 { margin: var(--space-md) 0 var(--space-sm); font-size: 1.15rem; }
.detail-body p { margin-bottom: var(--space-md); color: var(--color-text-light); line-height: 1.8; }
.detail-body ul { margin-bottom: var(--space-md); padding-left: var(--space-lg); }
.detail-body ul li { list-style: disc; color: var(--color-text-light); margin-bottom: 0.3rem; }

/* Itinerary */
.itinerary-day {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space-md);
  overflow: hidden;
}

.itinerary-day-header {
  background: var(--color-bg-alt);
  padding: var(--space-md);
  font-weight: 600;
  display: flex; align-items: center; gap: var(--space-sm);
}

.itinerary-day-header .day-num {
  background: var(--color-primary);
  color: var(--color-white);
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem;
}

.itinerary-day-body { padding: var(--space-md); }

.itinerary-day-body p { margin-bottom: 0; }

/* --- Price Box --- */
.price-box {
  background: var(--color-bg-alt);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  margin: var(--space-lg) 0;
}

.price-box .price { font-size: 2.5rem; font-weight: 700; color: var(--color-primary); font-family: var(--font-heading); }
.price-box .price small { font-size: 1rem; font-weight: 400; color: var(--color-text-light); }
.price-box p { margin-bottom: var(--space-md); }

/* --- Booking Modal --- */
.modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 2000;
  align-items: center; justify-content: center;
  padding: var(--space-md);
}

.modal-overlay.active { display: flex; }

.modal {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: var(--space-xl);
  position: relative;
}

.modal-close {
  position: absolute; top: var(--space-md); right: var(--space-md);
  background: none; border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-light);
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  transition: background 0.2s;
}

.modal-close:hover { background: var(--color-bg); }

.modal h2 { margin-bottom: var(--space-md); color: var(--color-primary); }

/* --- Float Button --- */
.float-btn {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 999;
  width: 60px; height: 60px;
  border-radius: 50%;
  background: #25D366;
  color: var(--color-white);
  display: flex;
  align-items: center; justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 4px 16px rgba(37,211,102,0.4);
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.float-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(37,211,102,0.5);
}

/* --- Spinner --- */
.spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
}

.spinner::after {
  content: '';
  width: 40px; height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* --- Destination Tags --- */
.tag {
  display: inline-block;
  background: var(--color-bg-alt);
  color: var(--color-primary);
  padding: 0.2rem 0.8rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
}

/* --- FAQ --- */
.faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space-sm);
  overflow: hidden;
}

.faq-question {
  padding: var(--space-md) var(--space-lg);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.faq-question:hover { background: var(--color-bg-alt); }

.faq-question i { transition: transform 0.2s; }

.faq-item.active .faq-question i { transform: rotate(180deg); }

.faq-answer {
  padding: 0 var(--space-lg);
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s;
  color: var(--color-text-light);
}

.faq-item.active .faq-answer {
  padding: 0 var(--space-lg) var(--space-lg);
  max-height: 500px;
}

/* --- News Cards --- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.news-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s;
}

.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.news-card-img { height: 200px; background-size: cover; background-position: center; }

.news-card-body { padding: var(--space-lg); }

.news-card-date { font-size: 0.8rem; color: var(--color-text-lighter); margin-bottom: var(--space-sm); }

.news-card-body h3 { font-size: 1.1rem; margin-bottom: var(--space-sm); }

.news-card-body p { color: var(--color-text-light); font-size: 0.9rem; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open { display: flex; }

  .nav-toggle { display: flex; }

  .hero { min-height: 60vh; }

  .about-grid,
  .contact-grid { grid-template-columns: 1fr; }

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

  .route-grid,
  .blog-grid,
  .review-grid,
  .news-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(3, 1fr); }
  .services-grid { grid-template-columns: 1fr; }
}