/* ============================================
   数字博物馆 - 全局样式表
   ============================================ */

/* CSS 变量定义 - 中国传统色系 */
:root {
    --color-vermilion: #C53D43;       /* 朱红 */
    --color-vermilion-light: #E85D5D;
    --color-vermilion-dark: #9B2B30;
    --color-tibetan-blue: #1B3B6F;   /* 藏蓝 */
    --color-tibetan-blue-light: #2C5AA0;
    --color-bamboo: #5C9B8E;         /* 竹青 */
    --color-bamboo-light: #7DBBAE;
    --color-gold: #D4A841;           /* 金色点缀 */
    --color-cream: #F8F4ED;          /* 米白背景 */
    --color-ivory: #FDFAF3;
    --color-dark: #2C2C2C;
    --color-gray: #666666;
    --color-gray-light: #999999;
    --color-border: #E8E0D5;
    --color-white: #FFFFFF;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.15);

    /* 过渡 */
    --transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;

    /* 间距 */
    --nav-height: 68px;
    --max-width: 1200px;
}

/* === 基础重置 === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-cream);
    color: var(--color-dark);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

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

ul, ol {
    list-style: none;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(27, 59, 111, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(27, 59, 111, 0.96);
    box-shadow: var(--shadow-md);
}

.navbar-inner {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar-logo img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.navbar-logo span {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 1px;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 10px 18px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.12);
}

/* 二级下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px 0;
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: 10px 20px;
    color: var(--color-dark);
    font-size: 0.9rem;
    transition: var(--transition);
}

.dropdown-menu li a:hover {
    background: var(--color-cream);
    color: var(--color-vermilion);
    padding-left: 26px;
}

/* 下拉菜单小箭头 */
.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 12px;
    height: 12px;
    background: rgba(255, 255, 255, 0.95);
}

/* 移动端汉堡菜单 */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
}

.navbar-toggle span {
    width: 26px;
    height: 3px;
    background: var(--color-white);
    border-radius: 3px;
    transition: var(--transition);
}

.navbar-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.navbar-toggle.open span:nth-child(2) {
    opacity: 0;
}

.navbar-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ============================================
   页面主内容区域
   ============================================ */
.main-content {
    padding-top: var(--nav-height);
    min-height: 60vh;
}

.page-banner {
    position: relative;
    height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-tibetan-blue) 0%, var(--color-vermilion-dark) 100%);
}

.page-banner h1 {
    position: relative;
    z-index: 2;
    color: var(--color-white);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: 4px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.page-banner::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background: var(--color-cream);
    clip-path: ellipse(70% 100% at 50% 100%);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 24px;
}

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

.section-title h2 {
    font-size: 2rem;
    color: var(--color-tibetan-blue);
    font-weight: 700;
    margin-bottom: 8px;
}

.section-title p {
    color: var(--color-gray);
    font-size: 1rem;
}

.section-title .divider {
    width: 60px;
    height: 4px;
    background: var(--color-vermilion);
    border-radius: 2px;
    margin: 12px auto 0;
}

/* ============================================
   首页 - 轮播图
   ============================================ */
.carousel {
    position: relative;
    width: 100%;
    height: 600px;
    overflow: hidden;
}

.carousel-track {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.5) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 24px;
}

.carousel-overlay h2 {
    color: var(--color-white);
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-shadow: 0 2px 30px rgba(0, 0, 0, 0.5);
    letter-spacing: 3px;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.carousel-slide.active .carousel-overlay h2 {
    opacity: 1;
    transform: translateY(0);
}

.carousel-overlay p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
    max-width: 600px;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease 0.2s;
}

.carousel-slide.active .carousel-overlay p {
    opacity: 1;
    transform: translateY(0);
}

/* 轮播控制按钮 */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: var(--color-white);
    font-size: 1.4rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 10;
}

.carousel-btn:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: translateY(-50%) scale(1.1);
}

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

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

/* 轮播指示点 */
.carousel-indicators {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.carousel-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.carousel-indicator.active {
    width: 36px;
    border-radius: 6px;
    background: var(--color-white);
}

/* ============================================
   首页 - 介绍卡片 / 特性区
   ============================================ */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-bamboo);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    background: linear-gradient(135deg, var(--color-vermilion), var(--color-vermilion-light));
    color: var(--color-white);
}

.feature-card:nth-child(2) .feature-icon {
    background: linear-gradient(135deg, var(--color-tibetan-blue), var(--color-tibetan-blue-light));
}

.feature-card:nth-child(3) .feature-icon {
    background: linear-gradient(135deg, var(--color-bamboo), var(--color-bamboo-light));
}

.feature-card h3 {
    font-size: 1.25rem;
    color: var(--color-dark);
    margin-bottom: 12px;
    font-weight: 600;
}

.feature-card p {
    color: var(--color-gray);
    font-size: 0.92rem;
    line-height: 1.8;
}

/* ============================================
   首页 - 数据统计区
   ============================================ */
.stats-section {
    background: linear-gradient(135deg, var(--color-tibetan-blue) 0%, #0F2847 100%);
    padding: 70px 0;
}

.stats-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    padding: 0 24px;
}

.stat-item {
    text-align: center;
    color: var(--color-white);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-gold);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   首页 - 项目预览卡片
   ============================================ */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}

.project-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

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

.project-card:hover img {
    transform: scale(1.05);
}

.project-card-body {
    padding: 20px;
}

.project-tag {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    margin-bottom: 10px;
    background: rgba(92, 155, 142, 0.15);
    color: var(--color-bamboo);
}

.project-card h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
    color: var(--color-dark);
}

.project-card p {
    font-size: 0.88rem;
    color: var(--color-gray);
    line-height: 1.6;
}

/* ============================================
   滚动动画
   ============================================ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.animate-on-scroll:nth-child(2) {
    transition-delay: 0.1s;
}

.animate-on-scroll:nth-child(3) {
    transition-delay: 0.2s;
}

.animate-on-scroll:nth-child(4) {
    transition-delay: 0.3s;
}

/* ============================================
   非遗项目页
   ============================================ */
.video-section {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
}

.video-wrapper {
    width: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--color-dark);
}

.video-wrapper video {
    width: 100%;
    display: block;
}

.video-caption {
    text-align: center;
    margin-top: 16px;
    color: var(--color-gray);
    font-size: 0.9rem;
}

/* ECharts 图表区 */
.charts-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 40px;
}

.chart-container {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.chart-container h3 {
    font-size: 1.1rem;
    color: var(--color-tibetan-blue);
    margin-bottom: 16px;
    text-align: center;
}

.chart-box {
    width: 100%;
    height: 360px;
}

/* ============================================
   传承人页 - 标签页
   ============================================ */
.inheritor-detail {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: 40px;
}

.inheritor-header {
    display: flex;
    gap: 30px;
    padding: 36px;
    background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-ivory) 100%);
}

.inheritor-avatar {
    width: 160px;
    height: 200px;
    border-radius: var(--radius-md);
    object-fit: cover;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.inheritor-info h2 {
    font-size: 1.6rem;
    color: var(--color-tibetan-blue);
    margin-bottom: 6px;
}

.inheritor-info .inheritor-title {
    color: var(--color-vermilion);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.inheritor-info p {
    color: var(--color-gray);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* 标签页导航 */
.tabs-nav {
    display: flex;
    border-bottom: 2px solid var(--color-border);
    padding: 0 36px;
    background: var(--color-ivory);
}

.tab-btn {
    padding: 16px 28px;
    background: none;
    border: none;
    font-size: 1rem;
    color: var(--color-gray);
    cursor: pointer;
    position: relative;
    transition: var(--transition);
    font-family: inherit;
}

.tab-btn:hover {
    color: var(--color-tibetan-blue);
}

.tab-btn.active {
    color: var(--color-vermilion);
    font-weight: 600;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-vermilion);
    border-radius: 2px;
}

/* 标签页内容 */
.tab-content {
    padding: 36px;
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-content h4 {
    font-size: 1.1rem;
    color: var(--color-tibetan-blue);
    margin-bottom: 14px;
}

.tab-content p {
    color: var(--color-gray);
    line-height: 1.9;
    margin-bottom: 14px;
}

.tab-content ul {
    padding-left: 20px;
    margin-bottom: 14px;
}

.tab-content ul li {
    list-style: disc;
    color: var(--color-gray);
    margin-bottom: 8px;
}

.work-item {
    display: flex;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
}

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

.work-item .work-year {
    color: var(--color-vermilion);
    font-weight: 600;
    min-width: 60px;
}

/* ============================================
   学术论坛页
   ============================================ */
.forum-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.forum-card {
    display: flex;
    gap: 24px;
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.forum-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(6px);
    border-left: 4px solid var(--color-vermilion);
}

.forum-card-date {
    text-align: center;
    min-width: 80px;
    padding: 12px;
    background: linear-gradient(135deg, var(--color-tibetan-blue), var(--color-tibetan-blue-light));
    border-radius: var(--radius-sm);
    color: var(--color-white);
    flex-shrink: 0;
    height: fit-content;
}

.forum-card-date .day {
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1;
}

.forum-card-date .month {
    font-size: 0.82rem;
    margin-top: 4px;
}

.forum-card-body h3 {
    font-size: 1.2rem;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.forum-card-body .meta {
    display: flex;
    gap: 16px;
    margin-bottom: 10px;
    font-size: 0.82rem;
    color: var(--color-gray-light);
}

.forum-card-body p {
    color: var(--color-gray);
    font-size: 0.9rem;
    line-height: 1.7;
}

.forum-card-body .read-more {
    display: inline-block;
    margin-top: 12px;
    color: var(--color-vermilion);
    font-size: 0.88rem;
    font-weight: 500;
}

.forum-card-body .read-more:hover {
    color: var(--color-vermilion-dark);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}

.pagination a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--color-white);
    color: var(--color-dark);
    border: 1px solid var(--color-border);
    font-size: 0.9rem;
    transition: var(--transition);
}

.pagination a:hover,
.pagination a.active {
    background: var(--color-vermilion);
    color: var(--color-white);
    border-color: var(--color-vermilion);
}

/* ============================================
   留言/关于页 - 表单
   ============================================ */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
    align-items: start;
}

.contact-info-card {
    background: linear-gradient(135deg, var(--color-tibetan-blue), #0F2847);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    color: var(--color-white);
}

.contact-info-card h3 {
    font-size: 1.4rem;
    margin-bottom: 24px;
}

.contact-info-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-start;
}

.contact-info-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.1rem;
}

.contact-info-item .label {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 2px;
}

.contact-info-item .value {
    font-size: 0.95rem;
}

/* 表单 */
.form-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--color-dark);
}

.form-group label .required {
    color: var(--color-vermilion);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--color-dark);
    background: var(--color-cream);
    transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-bamboo);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(92, 155, 142, 0.1);
}

.form-textarea {
    min-height: 140px;
    resize: vertical;
}

.form-input.error,
.form-textarea.error {
    border-color: var(--color-vermilion);
    background: rgba(197, 61, 67, 0.04);
}

.form-error {
    display: none;
    margin-top: 6px;
    font-size: 0.82rem;
    color: var(--color-vermilion);
}

.form-error.show {
    display: block;
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

/* 字数统计 */
.char-count {
    text-align: right;
    margin-top: 6px;
    font-size: 0.8rem;
    color: var(--color-gray-light);
}

.char-count.warning {
    color: var(--color-vermilion);
}

/* 提交按钮 */
.btn-primary {
    display: inline-block;
    padding: 14px 40px;
    background: linear-gradient(135deg, var(--color-vermilion), var(--color-vermilion-light));
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(197, 61, 67, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
}

/* 成功提示 */
.success-message {
    display: none;
    padding: 16px 24px;
    background: rgba(92, 155, 142, 0.1);
    border: 1px solid var(--color-bamboo);
    border-radius: var(--radius-sm);
    color: var(--color-bamboo);
    font-size: 0.92rem;
    margin-bottom: 20px;
    animation: fadeIn 0.4s ease;
}

.success-message.show {
    display: block;
}

/* ============================================
   关于页 - 介绍区
   ============================================ */
.about-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.about-image img {
    width: 100%;
    height: 360px;
    object-fit: cover;
}

.about-text h3 {
    font-size: 1.5rem;
    color: var(--color-tibetan-blue);
    margin-bottom: 16px;
}

.about-text p {
    color: var(--color-gray);
    line-height: 1.9;
    margin-bottom: 14px;
}

/* ============================================
   底部页脚
   ============================================ */
.footer {
    background: #0F1E33;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 20px;
    margin-top: 60px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    color: var(--color-white);
    font-size: 1.3rem;
    margin-bottom: 14px;
}

.footer-brand p {
    font-size: 0.88rem;
    line-height: 1.8;
}

.footer-col h4 {
    color: var(--color-white);
    font-size: 1rem;
    margin-bottom: 16px;
}

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

.footer-col ul li a {
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.84rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   通用工具类
   ============================================ */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-tibetan-blue);
    color: var(--color-white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 900;
    box-shadow: var(--shadow-md);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-vermilion);
    transform: translateY(-4px);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 968px) {
    .contact-layout {
        grid-template-columns: 1fr;
    }

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

    .charts-section {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .inheritor-header {
        flex-direction: column;
    }

    .inheritor-avatar {
        width: 140px;
        height: 180px;
    }
}

@media (max-width: 768px) {
    .navbar-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--nav-height));
        background: rgba(27, 59, 111, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        gap: 0;
        transform: translateX(100%);
        transition: transform 0.4s ease;
    }

    .navbar-menu.open {
        transform: translateX(0);
    }

    .navbar-toggle {
        display: flex;
    }

    .nav-item {
        width: 100%;
    }

    .nav-link {
        padding: 14px 16px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .dropdown-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        background: rgba(255, 255, 255, 0.08);
        backdrop-filter: none;
        box-shadow: none;
        padding: 0;
        min-width: auto;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
    }

    .dropdown-menu::before {
        display: none;
    }

    .nav-item:hover .dropdown-menu {
        max-height: 300px;
    }

    .dropdown-menu li a {
        color: rgba(255, 255, 255, 0.7);
        padding-left: 40px;
    }

    .carousel {
        height: 400px;
    }

    .carousel-overlay h2 {
        font-size: 1.8rem;
    }

    .carousel-overlay p {
        font-size: 1rem;
    }

    .page-banner h1 {
        font-size: 1.8rem;
    }

    .section-title h2 {
        font-size: 1.5rem;
    }

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

    .forum-card {
        flex-direction: column;
    }

    .tabs-nav {
        overflow-x: auto;
        padding: 0 16px;
    }

    .tab-btn {
        white-space: nowrap;
        padding: 14px 18px;
    }
}

@media (max-width: 480px) {
    .carousel {
        height: 300px;
    }

    .carousel-overlay h2 {
        font-size: 1.4rem;
    }

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

    .container {
        padding: 40px 16px;
    }

    .form-card {
        padding: 24px;
    }
}

/* ============================================
   数字博物馆首页
   ============================================ */
.hero-simple {
    background:
        linear-gradient(135deg, rgba(15, 30, 51, 0.72), rgba(155, 43, 48, 0.55)),
        url("../images/covers/henan.jpg") center/cover no-repeat;
    min-height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-white);
    padding: 72px 24px 56px;
}

.hero-simple-inner {
    max-width: 720px;
}

.hero-kicker {
    letter-spacing: 0.18em;
    font-size: 0.78rem;
    opacity: 0.85;
    margin-bottom: 12px;
}

.hero-simple h1 {
    font-size: clamp(1.7rem, 4.5vw, 2.8rem);
    letter-spacing: 0.12em;
    margin-bottom: 16px;
    text-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
}

.hero-simple p {
    font-size: 1.02rem;
    line-height: 1.8;
    opacity: 0.92;
}

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

.museum-card {
    display: block;
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.museum-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.museum-card img {
    width: 100%;
    aspect-ratio: 3 / 4;
    height: auto;
    object-fit: cover;
    object-position: top;
    display: block;
    transition: transform 0.5s ease;
}

.museum-card:hover img {
    transform: scale(1.05);
}

.museum-card-body {
    padding: 16px 18px 20px;
}

.museum-card h3 {
    font-size: 1.08rem;
    margin-bottom: 6px;
    color: var(--color-dark);
}

.museum-card p {
    font-size: 0.86rem;
    color: var(--color-gray);
}

.footer:has(.footer-bottom):not(:has(.footer-grid)) {
    padding: 28px 0;
    margin-top: 20px;
}

/* ============================================
   静态展厅（仅已点击过的圆点可交互）
   ============================================ */
body.exhibit-page {
    background: #111318;
    color: #f4f1ea;
    overflow: hidden;
}

.exhibit-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 18px;
    background: rgba(10, 12, 18, 0.78);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.exhibit-home,
.exhibit-back {
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.22);
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    border-radius: 999px;
    padding: 8px 14px;
    font-size: 0.88rem;
    cursor: pointer;
    font-family: inherit;
}

.exhibit-home:hover,
.exhibit-back:hover {
    background: rgba(255, 255, 255, 0.16);
}

.exhibit-titles {
    flex: 1;
    min-width: 0;
}

.exhibit-titles p {
    font-size: 0.75rem;
    opacity: 0.65;
    letter-spacing: 0.08em;
}

.exhibit-titles h1 {
    font-size: 1.02rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.exhibit-stage {
    height: 100dvh;
    padding: 72px 16px 56px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.exhibit-frame {
    position: relative;
    display: inline-block;
    max-width: 100%;
    max-height: calc(100dvh - 140px);
    line-height: 0;
}

.exhibit-frame img {
    display: block;
    max-width: min(100vw - 32px, 1280px);
    max-height: calc(100dvh - 140px);
    width: auto;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 16px 50px rgba(0, 0, 0, 0.45);
}

.exhibit-beacons {
    position: absolute;
    inset: 0;
}

.exhibit-beacon {
    position: absolute;
    width: 28px;
    height: 28px;
    transform: translate(-50%, -50%);
    border: 0;
    background: transparent;
    cursor: pointer;
    padding: 0;
}

.exhibit-beacon::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    width: 10px;
    height: 10px;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.7);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.55);
}

.exhibit-beacon:hover::after {
    width: 14px;
    height: 14px;
    background: #e85d5d;
}

.exhibit-hint {
    margin-top: 14px;
    font-size: 0.82rem;
    opacity: 0.62;
    text-align: center;
    max-width: 520px;
    line-height: 1.6;
}

.exhibit-toast {
    position: fixed;
    left: 50%;
    bottom: 28px;
    transform: translateX(-50%);
    z-index: 30;
    background: rgba(0, 0, 0, 0.82);
    color: #fff;
    padding: 10px 16px;
    border-radius: 999px;
    font-size: 0.86rem;
    white-space: nowrap;
}

@media (max-width: 968px) {
    .museum-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

    .hero-simple {
        min-height: 240px;
        padding: 56px 16px 40px;
    }

    .exhibit-titles h1 {
        font-size: 0.92rem;
    }
}

html {
    touch-action: manipulation;
}

body {
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.navbar {
    padding-top: var(--safe-area-inset-top, env(safe-area-inset-top, 0px));
}

.navbar-logo {
    border: 0;
    background: transparent;
    cursor: pointer;
    font: inherit;
    color: inherit;
}

.main-content {
    padding-top: calc(var(--nav-height) + var(--safe-area-inset-top, env(safe-area-inset-top, 0px)));
}

.hero-simple {
    background:
        linear-gradient(135deg, rgba(15, 30, 51, 0.72), rgba(155, 43, 48, 0.55)),
        url("../images/covers/henan.jpg") center/cover no-repeat;
}

button.museum-card {
    width: 100%;
    padding: 0;
    font: inherit;
    text-align: left;
    color: inherit;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
}

button.museum-card:active {
    opacity: 0.86;
}

body.is-exhibit {
    background: #111318;
    overflow: hidden;
}

.exhibit-bar {
    padding-top: calc(12px + var(--safe-area-inset-top, env(safe-area-inset-top, 0px)));
}

.exhibit-stage {
    padding-bottom: calc(56px + var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px)));
}