/* 北京故宫景点网站 - 主样式表 */

/* 设计令牌 */
:root {
  --palace-red: #9D2933;
  --palace-red-dark: #751D23;
  --imperial-gold: #C59D3F;
  --imperial-gold-light: #E8C86A;
  --stone-grey: #5A5A5A;
  --ink-black: #2B2B2B;
  --warm-ivory: #F8F4EA;
  --paper-beige: #F0E9DA;
  --shadow: rgba(43, 43, 43, 0.12);
  --shadow-heavy: rgba(43, 43, 43, 0.25);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
  --transition-slow: 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  --radius-small: 4px;
  --radius-medium: 8px;
  --radius-large: 16px;
  --container-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--warm-ivory);
  color: var(--ink-black);
  line-height: 1.8;
}

h1, h2, h3, h4, .display-font {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-weight: 700;
  line-height: 1.3;
}

a {
  color: var(--palace-red);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--imperial-gold);
}

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

/* 滚动进度条 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 0;
  background: linear-gradient(90deg, var(--imperial-gold), var(--imperial-gold-light));
  z-index: 1100;
  transition: width 0.05s linear;
  box-shadow: 0 0 8px rgba(197, 157, 63, 0.6);
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部导航 */
.top-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: linear-gradient(180deg, var(--palace-red) 0%, var(--palace-red-dark) 100%);
  box-shadow: 0 4px 20px var(--shadow-heavy);
  transition: padding var(--transition-fast), box-shadow var(--transition-fast);
}

.top-header.scrolled {
  box-shadow: 0 6px 28px rgba(43, 43, 43, 0.35);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--imperial-gold-light);
  font-family: "Noto Serif SC", serif;
  font-size: 1.5rem;
  font-weight: 700;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: translateX(2px);
  color: var(--imperial-gold-light);
}

.logo svg {
  width: 40px;
  height: 40px;
  fill: currentColor;
  animation: floatGold 4s ease-in-out infinite;
}

@keyframes floatGold {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

.main-nav {
  display: flex;
  list-style: none;
  gap: 6px;
}

.main-nav li {
  position: relative;
}

.main-nav a {
  display: block;
  padding: 24px 18px;
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: background var(--transition-fast), color var(--transition-fast);
  position: relative;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 14px;
  width: 0;
  height: 2px;
  background: var(--imperial-gold-light);
  transition: width var(--transition-fast), left var(--transition-fast);
}

.main-nav a:hover::after,
.main-nav a:focus::after {
  width: calc(100% - 36px);
  left: 18px;
}

.main-nav a:hover,
.main-nav a:focus {
  background: rgba(255, 255, 255, 0.08);
  color: var(--imperial-gold-light);
}

.main-nav li:hover > a {
  color: var(--imperial-gold-light);
}

/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--palace-red-dark);
  border-top: 3px solid var(--imperial-gold);
  border-radius: 0 0 var(--radius-medium) var(--radius-medium);
  box-shadow: 0 12px 30px var(--shadow-heavy);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  list-style: none;
  overflow: hidden;
  z-index: 100;
}

.main-nav li:hover .dropdown-menu,
.main-nav li:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu a {
  padding: 14px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  position: relative;
}

.dropdown-menu a::after {
  display: none;
}

.dropdown-menu a:hover {
  background: rgba(255, 255, 255, 0.1);
  padding-left: 26px;
  transition: padding-left var(--transition-fast);
}

.dropdown-menu a:last-child {
  border-bottom: none;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--imperial-gold-light);
  font-size: 1.6rem;
  cursor: pointer;
}

/* Hero 轮播区 */
.hero {
  position: relative;
  height: 600px;
  overflow: hidden;
}

.carousel {
  position: relative;
  height: 100%;
  width: 100%;
  outline: none;
}

.carousel-track {
  display: flex;
  height: 100%;
  transition: transform var(--transition-slow);
}

.carousel-slide {
  min-width: 100%;
  height: 100%;
  position: relative;
  background-size: cover;
  background-position: center;
}

.carousel-slide::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(43, 43, 43, 0.7) 0%, rgba(43, 43, 43, 0.2) 60%, transparent 100%);
}

.carousel-content {
  position: absolute;
  left: 8%;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  max-width: 560px;
  color: #fff;
}

.carousel-content h2 {
  font-size: 3.2rem;
  margin-bottom: 18px;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.9s var(--transition-slow) forwards;
}

.carousel-content p {
  font-size: 1.15rem;
  margin-bottom: 28px;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.9s var(--transition-slow) 0.15s forwards;
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.carousel-dots {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 3;
}

.dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: 0;
}

.dot.active {
  background: var(--imperial-gold-light);
  transform: scale(1.2);
  border-color: #fff;
}

.dot:hover {
  background: rgba(255, 255, 255, 0.85);
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.3rem;
  backdrop-filter: blur(4px);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.carousel-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-50%) scale(1.08);
}

.carousel-btn.prev { left: 24px; }
.carousel-btn.next { right: 24px; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--imperial-gold) 0%, var(--imperial-gold-light) 100%);
  color: var(--ink-black);
  box-shadow: 0 4px 14px rgba(197, 157, 63, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(197, 157, 63, 0.45);
  color: var(--ink-black);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(197, 157, 63, 0.35);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.8);
}

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

/* 区块标题 */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 2.2rem;
  color: var(--palace-red);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--imperial-gold);
  border-radius: 2px;
}

.section-header p {
  color: var(--stone-grey);
  max-width: 640px;
  margin: 20px auto 0;
}

.section {
  padding: 80px 0;
}

.bg-paper {
  background: var(--paper-beige);
}

.bg-red {
  background: var(--palace-red);
  color: #fff;
}

.bg-red .section-header h2 {
  color: var(--imperial-gold-light);
}

.bg-red .section-header h2::after {
  background: var(--imperial-gold-light);
}

.bg-red .section-header p {
  color: rgba(255, 255, 255, 0.85);
}

/* 简介区 */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.intro-text h2 {
  font-size: 2rem;
  color: var(--palace-red);
  margin-bottom: 20px;
}

.intro-text p {
  margin-bottom: 16px;
  color: var(--stone-grey);
}

.intro-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.stat-card {
  background: #fff;
  padding: 22px;
  border-radius: var(--radius-medium);
  text-align: center;
  box-shadow: 0 6px 18px var(--shadow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 26px var(--shadow);
}

.stat-number {
  font-family: "Noto Serif SC", serif;
  font-size: 2rem;
  color: var(--palace-red);
  font-weight: 700;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--stone-grey);
}

.intro-image {
  position: relative;
  border-radius: var(--radius-large);
  overflow: hidden;
  box-shadow: 0 18px 50px var(--shadow-heavy);
}

.intro-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.intro-image:hover img {
  transform: scale(1.05);
}

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

.feature-card {
  background: #fff;
  border-radius: var(--radius-large);
  overflow: hidden;
  box-shadow: 0 8px 24px var(--shadow);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  cursor: pointer;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 18px 40px var(--shadow-heavy);
}

.feature-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.feature-card:hover img {
  transform: scale(1.08);
}

.feature-card .card-body {
  padding: 24px;
  border-top: 3px solid transparent;
  transition: border-color var(--transition-fast);
}

.feature-card:hover .card-body {
  border-top-color: var(--imperial-gold);
}

.feature-card h3 {
  color: var(--palace-red);
  margin-bottom: 10px;
  font-size: 1.25rem;
}

.feature-card p {
  color: var(--stone-grey);
  font-size: 0.95rem;
}

/* 表格 */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius-medium);
  overflow: hidden;
  box-shadow: 0 8px 24px var(--shadow);
}

.data-table thead {
  background: var(--palace-red);
  color: #fff;
}

.data-table th,
.data-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid rgba(216, 210, 197, 0.4);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:nth-child(even) {
  background: rgba(240, 233, 218, 0.5);
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: rgba(197, 157, 63, 0.12);
}

/* 表单 */
.form-card {
  max-width: 720px;
  margin: 0 auto;
  background: #fff;
  padding: 40px;
  border-radius: var(--radius-large);
  box-shadow: 0 12px 36px var(--shadow);
  border-top: 4px solid var(--palace-red);
}

.form-group {
  margin-bottom: 22px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--ink-black);
}

.form-group label::after {
  content: " *";
  color: var(--palace-red);
  opacity: 0.6;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #D8D2C5;
  border-radius: var(--radius-small);
  background: #FAFAF8;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--imperial-gold);
  box-shadow: 0 0 0 3px rgba(197, 157, 63, 0.15);
}

.form-group .invalid,
.form-group input.invalid,
.form-group select.invalid,
.form-group textarea.invalid {
  border-color: var(--palace-red);
  background: rgba(157, 41, 51, 0.04);
  box-shadow: 0 0 0 3px rgba(157, 41, 51, 0.08);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-hint {
  font-size: 0.85rem;
  color: var(--stone-grey);
  margin-top: 6px;
}

.form-message {
  padding: 14px 18px;
  border-radius: var(--radius-small);
  margin-bottom: 20px;
  display: none;
  animation: shake 0.4s ease;
}

.form-message.success {
  display: block;
  background: #E8F5E9;
  color: #2E7D32;
  border: 1px solid #A5D6A7;
  animation: pulseSuccess 0.6s ease;
}

.form-message.error {
  display: block;
  background: #FFEBEE;
  color: #C62828;
  border: 1px solid #EF9A9A;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

@keyframes pulseSuccess {
  0% { transform: scale(0.95); opacity: 0; }
  60% { transform: scale(1.02); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

/* 视频区 */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  border-radius: var(--radius-large);
  overflow: hidden;
  box-shadow: 0 12px 36px var(--shadow-heavy);
  background: #000;
  border: 4px solid rgba(255, 255, 255, 0.1);
}

.video-wrapper iframe,
.video-wrapper video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-wrapper video {
  object-fit: contain;
  background: #000;
}

/* 页面横幅 */
.page-banner {
  position: relative;
  height: 320px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.page-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(43, 43, 43, 0.65) 0%, rgba(157, 41, 51, 0.55) 100%);
}

.page-banner::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(180deg, transparent 0%, var(--warm-ivory) 100%);
  z-index: 1;
}

.page-banner h1 {
  position: relative;
  z-index: 2;
  color: #fff;
  font-size: 2.8rem;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  letter-spacing: 4px;
  animation: fadeUp 1s var(--transition-slow) forwards;
  opacity: 0;
}

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--imperial-gold);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 36px;
  padding-left: 30px;
  padding-bottom: 20px;
  border-bottom: 1px dashed rgba(197, 157, 63, 0.3);
}

.timeline-item:last-child {
  border-bottom: none;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 18px;
  height: 18px;
  background: var(--palace-red);
  border: 4px solid var(--imperial-gold-light);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(157, 41, 51, 0.15);
}

.timeline-year {
  font-family: "Noto Serif SC", serif;
  font-size: 1.4rem;
  color: var(--palace-red);
  font-weight: 700;
}

.timeline-content h3 {
  margin-bottom: 6px;
  color: var(--ink-black);
}

/* 建筑布局图 */
.layout-map {
  background: #fff;
  border-radius: var(--radius-large);
  padding: 40px;
  box-shadow: 0 12px 36px var(--shadow);
}

.map-svg {
  width: 100%;
  height: auto;
}

.map-zone {
  fill: var(--paper-beige);
  stroke: var(--imperial-gold);
  stroke-width: 2;
  transition: fill var(--transition-fast);
  cursor: pointer;
}

.map-zone:hover {
  fill: rgba(197, 157, 63, 0.25);
}

.map-zone.active {
  fill: rgba(157, 41, 51, 0.18);
  stroke: var(--palace-red);
  stroke-width: 3;
}

.map-label {
  font-size: 0.85rem;
  fill: var(--ink-black);
  text-anchor: middle;
  pointer-events: none;
  font-weight: 600;
}

.map-info {
  background: #F8F4EA;
  border-radius: var(--radius-medium);
  border-left: 4px solid var(--imperial-gold);
  transition: all var(--transition-fast);
}

.map-info.active {
  background: #fff;
  border-left-color: var(--palace-red);
  box-shadow: 0 6px 18px var(--shadow);
  animation: fadeInfo 0.5s ease;
}

@keyframes fadeInfo {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 页脚 */
.site-footer {
  background: linear-gradient(180deg, #2B2B2B 0%, #1A1A1A 100%);
  color: rgba(255, 255, 255, 0.75);
  padding: 60px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: var(--imperial-gold-light);
  margin-bottom: 18px;
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--imperial-gold);
}

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

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.75);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-col a:hover {
  color: var(--imperial-gold-light);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.9rem;
}

/* 动画类 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 装饰分隔线 */
.divider-gold {
  width: 80px;
  height: 4px;
  background: var(--imperial-gold);
  border-radius: 2px;
  margin: 20px auto;
}

/* 响应式 */
@media (max-width: 992px) {
  .intro-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero {
    height: 520px;
  }
  .carousel-content h2 {
    font-size: 2.4rem;
  }
  .page-banner h1 {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .main-nav {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--palace-red-dark);
    flex-direction: column;
    display: none;
    padding: 10px 0;
    box-shadow: 0 12px 30px var(--shadow-heavy);
  }
  .main-nav.active {
    display: flex;
  }
  .main-nav li {
    width: 100%;
  }
  .main-nav a {
    padding: 16px 24px;
  }
  .main-nav a::after {
    display: none;
  }
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
    box-shadow: none;
    border-top: none;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 0;
  }
  .main-nav li.open .dropdown-menu {
    display: block;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .intro-stats {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .carousel-content {
    left: 5%;
    right: 5%;
    max-width: 100%;
  }
  .carousel-content h2 {
    font-size: 2rem;
  }
  .carousel-content p {
    font-size: 1rem;
  }
  .page-banner h1 {
    font-size: 2rem;
    letter-spacing: 2px;
  }
  .hero {
    height: 460px;
  }
  .section {
    padding: 56px 0;
  }
  .section-header h2 {
    font-size: 1.75rem;
  }
  .intro-text h2 {
    font-size: 1.5rem;
  }
  .form-card {
    padding: 24px;
  }
  .feature-card img {
    height: 180px;
  }
}

@media (max-width: 480px) {
  .nav-inner {
    height: 60px;
  }
  .logo {
    font-size: 1.2rem;
  }
  .logo svg {
    width: 32px;
    height: 32px;
  }
  .main-nav {
    top: 60px;
  }
  .hero {
    height: 380px;
  }
}