/* ===== 北京城市形象网站 - 全局样式 ===== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700&display=swap');

:root {
  --red: #C0392B;
  --dark-red: #922b21;
  --gold: #D4AC0D;
  --dark-gold: #B7950B;
  --dark: #1a0a00;
  --dark2: #2c1810;
  --text: #3d2b1f;
  --text-light: #7d6357;
  --bg: #fdf6f0;
  --white: #fff;
  --nav-h: 70px;
  --shadow: 0 4px 20px rgba(0,0,0,0.15);
  --radius: 8px;
}

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

body {
  font-family: 'Noto Serif SC', '宋体', serif;
  background: var(--bg);
  color: var(--text);
  min-width: 800px;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--dark);
  color: var(--gold);
  font-size: 13px;
  padding: 6px 0;
  text-align: center;
  letter-spacing: 2px;
}

/* ===== LOGO & 导航 ===== */
header {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark2) 60%, #4a1c0e 100%);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: var(--nav-h);
}

/* LOGO */
.logo {
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
}

.logo-icon {
  width: 50px;
  height: 50px;
  position: relative;
}

.logo-icon svg {
  width: 100%;
  height: 100%;
}

.logo-text {
  line-height: 1.2;
}

.logo-text .cn {
  font-size: 22px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 4px;
  text-shadow: 0 0 10px rgba(212,172,13,0.5);
}

.logo-text .en {
  font-size: 11px;
  color: #aaa;
  letter-spacing: 3px;
  font-weight: 400;
}

/* 导航菜单 */
nav ul {
  display: flex;
  list-style: none;
  gap: 4px;
}

nav ul li {
  position: relative;
}

nav ul li a {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 16px;
  color: #e8d5c0;
  font-size: 14px;
  letter-spacing: 1px;
  border-radius: 4px;
  transition: all 0.3s;
  white-space: nowrap;
}

nav ul li a .nav-icon {
  font-size: 18px;
  margin-bottom: 2px;
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--gold);
  background: rgba(212,172,13,0.12);
}

nav ul li a.active::after {
  content: '';
  display: block;
  width: 60%;
  height: 2px;
  background: var(--gold);
  margin: 4px auto 0;
  border-radius: 2px;
}

/* ===== 英雄区 Flash动画 ===== */
.hero {
  position: relative;
  width: 100%;
  height: 520px;
  overflow: hidden;
  background: #000;
}

.hero-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.6) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.hero-overlay h1 {
  font-size: 56px;
  color: var(--white);
  letter-spacing: 12px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.8), 0 0 40px rgba(212,172,13,0.4);
  font-weight: 700;
  animation: fadeInDown 1.2s ease;
}

.hero-overlay p {
  font-size: 18px;
  color: rgba(255,255,255,0.85);
  letter-spacing: 4px;
  margin-top: 16px;
  animation: fadeInUp 1.2s ease 0.3s both;
}

.hero-btn {
  margin-top: 36px;
  display: flex;
  gap: 16px;
  animation: fadeInUp 1.2s ease 0.6s both;
}

.hero-btn a {
  padding: 12px 32px;
  border-radius: 30px;
  font-size: 15px;
  letter-spacing: 2px;
  font-weight: 600;
  transition: all 0.3s;
  cursor: pointer;
}

.btn-primary {
  background: var(--red);
  color: #fff;
  border: 2px solid var(--red);
}

.btn-primary:hover {
  background: var(--dark-red);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(192,57,43,0.5);
}

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

.btn-outline:hover {
  background: var(--gold);
  color: var(--dark);
  transform: translateY(-2px);
}

/* 轮播指示器 */
.hero-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 20;
}

.hero-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: all 0.3s;
}

.hero-dots span.active {
  background: var(--gold);
  width: 28px;
  border-radius: 5px;
}

/* ===== 通用区块 ===== */
.section {
  padding: 64px 0;
}

.section-alt {
  background: linear-gradient(180deg, #f5e8da 0%, #fdf6f0 100%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 32px;
  color: var(--dark);
  letter-spacing: 6px;
  position: relative;
  display: inline-block;
  padding-bottom: 16px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(to right, var(--red), var(--gold));
  border-radius: 2px;
}

.section-title p {
  margin-top: 12px;
  color: var(--text-light);
  font-size: 15px;
  letter-spacing: 2px;
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  transition: all 0.3s;
  cursor: pointer;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.15);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.5s;
}

.card:hover .card-img {
  transform: scale(1.06);
}

.card-body {
  padding: 20px;
}

.card-body h3 {
  font-size: 18px;
  color: var(--dark);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.card-body p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
}

.card-tag {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 12px;
  background: rgba(192,57,43,0.1);
  color: var(--red);
  border-radius: 20px;
  font-size: 12px;
  letter-spacing: 1px;
}

/* ===== 统计数字 ===== */
.stats {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-red) 100%);
  padding: 56px 0;
  color: #fff;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item h3 {
  font-size: 42px;
  color: var(--gold);
  font-weight: 700;
}

.stat-item h3 span {
  font-size: 20px;
}

.stat-item p {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  letter-spacing: 2px;
  margin-top: 8px;
}

/* ===== 底部 ===== */
footer {
  background: var(--dark);
  color: rgba(255,255,255,0.6);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .cn {
  font-size: 22px;
  color: var(--gold);
  letter-spacing: 4px;
  font-weight: 700;
}

.footer-brand p {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.9;
}

.footer-col h4 {
  color: #fff;
  font-size: 15px;
  letter-spacing: 2px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
  font-size: 13px;
}

.footer-col ul li a {
  color: rgba(255,255,255,0.55);
  transition: color 0.3s;
}

.footer-col ul li a:hover {
  color: var(--gold);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

/* ===== 内页英雄 ===== */
.page-hero {
  height: 260px;
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-red) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.page-hero h1 {
  font-size: 40px;
  letter-spacing: 8px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.5);
  position: relative;
  z-index: 1;
}

.page-hero p {
  font-size: 15px;
  color: rgba(255,255,255,0.7);
  letter-spacing: 3px;
  margin-top: 10px;
  position: relative;
  z-index: 1;
}

/* 面包屑 */
.breadcrumb {
  background: #f0e4d8;
  padding: 12px 0;
  font-size: 13px;
  color: var(--text-light);
}

.breadcrumb a {
  color: var(--red);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* ===== 时间线 ===== */
.timeline {
  position: relative;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--red), var(--gold));
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  gap: 40px;
  margin-bottom: 48px;
  position: relative;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 24px;
  width: 16px;
  height: 16px;
  background: var(--gold);
  border: 3px solid var(--red);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-content {
  width: 45%;
  background: var(--white);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.timeline-content h3 {
  font-size: 18px;
  color: var(--red);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.timeline-content .year {
  font-size: 28px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 12px;
  display: block;
}

.timeline-content p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-light);
}

/* ===== 景点网格 ===== */
.attraction-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.attraction-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  height: 240px;
  cursor: pointer;
}

.attraction-card .bg {
  width: 100%;
  height: 100%;
  transition: transform 0.5s;
}

.attraction-card:hover .bg {
  transform: scale(1.08);
}

.attraction-card .info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px;
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  color: #fff;
  transform: translateY(40px);
  transition: transform 0.3s;
}

.attraction-card:hover .info {
  transform: translateY(0);
}

.attraction-card .info h3 {
  font-size: 20px;
  letter-spacing: 3px;
}

.attraction-card .info p {
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  margin-top: 6px;
  line-height: 1.6;
}

/* ===== 美食卡片 ===== */
.food-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.food-card {
  text-align: center;
  background: #fff;
  border-radius: var(--radius);
  padding: 24px 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
  transition: all 0.3s;
}

.food-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.12);
}

.food-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.food-card h3 {
  font-size: 16px;
  color: var(--dark);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.food-card p {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.7;
}

/* ===== 旅游指南 ===== */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.guide-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
  border-left: 4px solid var(--red);
  transition: all 0.3s;
}

.guide-card:hover {
  transform: translateX(4px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.1);
}

.guide-card .icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.guide-card h3 {
  font-size: 18px;
  color: var(--dark);
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.guide-card ul {
  list-style: none;
}

.guide-card ul li {
  font-size: 14px;
  color: var(--text-light);
  padding: 6px 0;
  border-bottom: 1px dashed #e0d0c0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.guide-card ul li::before {
  content: '▸';
  color: var(--red);
  flex-shrink: 0;
}

/* ===== 城市风貌 ===== */
.citylife-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 48px;
}

.citylife-hero .text h2 {
  font-size: 28px;
  color: var(--dark);
  letter-spacing: 4px;
  line-height: 1.6;
  margin-bottom: 16px;
}

.citylife-hero .text p {
  font-size: 14px;
  line-height: 2;
  color: var(--text-light);
}

/* ===== 关于北京 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text h2 {
  font-size: 28px;
  letter-spacing: 4px;
  color: var(--dark);
  margin-bottom: 24px;
  position: relative;
  padding-bottom: 16px;
}

.about-text h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--red);
  border-radius: 2px;
}

.about-text p {
  font-size: 14px;
  line-height: 2.2;
  color: var(--text-light);
  margin-bottom: 16px;
}

.about-visual {
  position: relative;
}

/* ===== 动画 ===== */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-40px); }
  to { opacity: 1; transform: translateY(0); }
}

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

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes shimmer {
  0% { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

.animate-fade-in {
  animation: fadeIn 0.8s ease both;
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ===== 地图区域 ===== */
.map-section {
  background: var(--dark);
  padding: 64px 0;
  color: #fff;
}

.map-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.map-info h2 {
  font-size: 28px;
  color: var(--gold);
  letter-spacing: 4px;
  margin-bottom: 24px;
}

.map-info .info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  align-items: flex-start;
}

.map-info .info-icon {
  font-size: 22px;
  flex-shrink: 0;
}

.map-info .info-text h4 {
  font-size: 15px;
  color: var(--gold);
  margin-bottom: 4px;
}

.map-info .info-text p {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
}

/* 季节图标 */
.seasons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.season-item {
  text-align: center;
  padding: 20px 12px;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.08);
}

.season-item .icon { font-size: 32px; }
.season-item h4 {
  color: var(--gold);
  margin-top: 8px;
  font-size: 14px;
}

.season-item p {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .attraction-grid { grid-template-columns: repeat(2, 1fr); }
  .food-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-grid { grid-template-columns: 1fr; }
  .citylife-hero { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .map-inner { grid-template-columns: 1fr; }
  .timeline::before { left: 20px; }
  .timeline-item { flex-direction: column; }
  .timeline-item:nth-child(even) { flex-direction: column; }
  .timeline-item::before { left: 20px; }
  .timeline-content { width: 100%; margin-left: 40px; }
}