/* ========================================
   第六届全国冻土工程与寒区环境学术会议
   专业学术会议网站样式系统
   设计风格：现代学术风
   ======================================== */

/* CSS变量定义 - 设计系统颜色 */
:root {
    /* 主色系 - 学术蓝 */
    --primary-dark: #0a2540;
    --primary: #0056b3;
    --primary-light: #4a90d9;
    --primary-lighter: #e8f4fd;
    
    /* 辅助色 */
    --accent: #00a8e8;
    --accent-light: #5bc0de;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    
    /* 中性色 */
    --text-dark: #1a1a2e;
    --text: #2d3748;
    --text-light: #4a5568;
    --text-muted: #718096;
    --bg-light: #f8fafc;
    --bg: #ffffff;
    --border: #e2e8f0;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #0a2540 0%, #0056b3 50%, #00a8e8 100%);
    --gradient-banner: linear-gradient(135deg, rgba(10, 37, 64, 0.95) 0%, rgba(0, 86, 179, 0.9) 50%, rgba(0, 168, 232, 0.85) 100%);
    --gradient-card: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(0, 86, 179, 0.15);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
}

/* ========================================
   基础样式重置
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    line-height: 1.7;
    color: var(--text);
    background-color: var(--bg-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   会议标题区域 - 在导航栏上方
   ======================================== */
.conference-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: white;
    padding: 2rem 0;
    position: relative;
    overflow: hidden;
}

.conference-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 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");
    opacity: 0.5;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    position: relative;
    z-index: 1;
}

.header-logo {
    width: 70px;
    height: 70px;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
}

.header-text {
    text-align: left;
}

.header-text h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.header-theme {
    font-size: 1.1rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.75rem;
    letter-spacing: 2px;
}

.header-meta {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
}

.header-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.header-meta .divider {
    margin: 0 1rem;
    opacity: 0.5;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .conference-header {
        padding: 1.5rem 0;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .header-logo {
        width: 55px;
        height: 55px;
        font-size: 1.5rem;
    }
    
    .header-text {
        text-align: center;
    }
    
    .header-text h1 {
        font-size: 1.25rem;
    }
    
    .header-theme {
        font-size: 0.9rem;
        letter-spacing: 1px;
    }
    
    .header-meta {
        font-size: 0.85rem;
    }
    
    .header-meta .divider {
        margin: 0 0.5rem;
    }
}

/* ========================================
   导航栏设计 - 腾讯级现代化设计
   设计理念：胶囊悬浮 + 渐变光效
   ======================================== */
.navbar {
    background: rgba(255, 255, 255, 0.85) !important;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
    padding: 0.5rem 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: sticky;
    top: 0;
    z-index: 1020;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95) !important;
    box-shadow: 0 8px 40px rgba(0, 86, 179, 0.12);
    padding: 0.35rem 0;
}

/* 菜单容器 */
.navbar-nav {
    flex-direction: row;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.25rem;
    background: rgba(248, 250, 252, 0.6);
    border-radius: 50px;
    border: 1px solid rgba(226, 232, 240, 0.6);
}

/* 导航链接 - 胶囊样式 */
.navbar .nav-link {
    color: var(--text-light) !important;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.6rem 1.25rem !important;
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 50px;
    white-space: nowrap;
    letter-spacing: 0.3px;
}

/* 悬停效果 - 悬浮升起 */
.navbar .nav-link:hover {
    color: var(--primary) !important;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 4px 15px rgba(0, 86, 179, 0.15);
    transform: translateY(-2px);
}

/* 激活状态 - 渐变胶囊 */
.navbar .nav-link.active {
    color: white !important;
    font-weight: 600;
    background: var(--gradient-primary);
    box-shadow: 0 4px 20px rgba(0, 86, 179, 0.35);
}

/* 激活状态悬停 */
.navbar .nav-link.active:hover {
    box-shadow: 0 6px 25px rgba(0, 86, 179, 0.45);
    transform: translateY(-2px);
}

/* 导航栏居中布局 */
.navbar-collapse {
    justify-content: center;
}

/* 移动端菜单按钮 */
.navbar-toggler {
    border: none;
    padding: 0.5rem;
    border-radius: 12px;
    background: rgba(0, 86, 179, 0.05);
    transition: all 0.3s ease;
}

.navbar-toggler:hover {
    background: rgba(0, 86, 179, 0.1);
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.15);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%230056b3' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 导航图标样式 */
.navbar .nav-link i {
    font-size: 0.85rem;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.navbar .nav-link:hover i {
    opacity: 1;
    transform: scale(1.1);
}

.navbar .nav-link.active i {
    opacity: 1;
}

/* ========================================
   Banner轮播图设计
   ======================================== */
.banner-carousel {
    position: relative;
    height: 450px;
    overflow: hidden;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: center center/cover no-repeat;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
    z-index: 1;
}

.carousel-slide.active {
    opacity: 1;
    z-index: 2;
}

/* 图片遮罩 */
.carousel-slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(10, 37, 64, 0.1) 0%, rgba(10, 37, 64, 0.2) 100%);
    pointer-events: none;
}

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

.carousel-indicators .indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.carousel-indicators .indicator:hover {
    background: rgba(255, 255, 255, 0.8);
}

.carousel-indicators .indicator.active {
    background: white;
    transform: scale(1.2);
    border-color: var(--primary);
}

/* 左右切换按钮 */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 10;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
}

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

.carousel-btn.prev {
    left: 20px;
}

.carousel-btn.next {
    right: 20px;
}

/* 响应式Banner高度 */
@media (max-width: 991px) {
    .banner-carousel {
        height: 350px;
    }
}

@media (max-width: 768px) {
    .banner-carousel {
        height: 280px;
    }
    
    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .carousel-btn.prev {
        left: 10px;
    }
    
    .carousel-btn.next {
        right: 10px;
    }
}

@media (max-width: 576px) {
    .banner-carousel {
        height: 200px;
    }
    
    .carousel-indicators .indicator {
        width: 10px;
        height: 10px;
    }
}

/* 内页Banner样式 */
.page-banner {
    background: var(--gradient-primary);
    color: white;
    padding: 60px 0;
    margin-top: 60px;
    text-align: center;
    position: relative;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 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='0.05'%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");
    opacity: 0.5;
}

.page-banner h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    position: relative;
}

.page-banner p {
    font-size: 1.1rem;
    opacity: 0.9;
    position: relative;
}

/* ========================================
   卡片设计 - 玻璃拟态风格
   ======================================== */
.card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.card-header {
    background: transparent;
    border-bottom: 2px solid var(--border);
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    color: var(--primary-dark);
}

.card-header h4,
.card-header h5 {
    font-weight: 600;
    color: var(--primary-dark);
}

.card-body {
    padding: 1.5rem;
}

/* 特色卡片 */
.feature-card {
    background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
    border: 1px solid rgba(0, 86, 179, 0.1);
}

.feature-card .card-header {
    background: linear-gradient(135deg, rgba(0, 86, 179, 0.05) 0%, transparent 100%);
    border-bottom: 2px solid rgba(0, 86, 179, 0.1);
}

/* 信息卡片 */
.info-card {
    background: linear-gradient(135deg, #ffffff 0%, #f0fff4 100%);
    border: 1px solid rgba(40, 167, 69, 0.1);
}

/* 警告卡片 */
.alert-card {
    background: linear-gradient(135deg, #fffbeb 0%, #ffffff 100%);
    border: 1px solid rgba(255, 193, 7, 0.2);
}

/* ========================================
   按钮设计 - 现代渐变
   ======================================== */
.btn {
    border-radius: var(--radius-sm);
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
    box-shadow: 0 4px 15px rgba(0, 86, 179, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 8px 25px rgba(0, 86, 179, 0.4);
}

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

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

/* 快速入口按钮 */
.quick-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    border-radius: var(--radius);
}

.quick-btn i {
    font-size: 1.25rem;
}

/* ========================================
   新闻列表设计
   ======================================== */
.news-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.news-item {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

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

.news-item:hover {
    background: rgba(0, 86, 179, 0.02);
    margin: 0 -1.5rem;
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-sm);
}

.news-link {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.news-link:hover {
    color: var(--primary);
}

.news-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.news-date {
    color: var(--text-muted);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.news-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-lighter);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
    margin-right: 0.75rem;
}

/* ========================================
   表格设计
   ======================================== */
.table {
    font-size: 0.95rem;
    border-collapse: separate;
    border-spacing: 0;
}

.table thead th {
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
    padding: 1rem;
    border: none;
}

.table thead th:first-child {
    border-radius: var(--radius-sm) 0 0 0;
}

.table thead th:last-child {
    border-radius: 0 var(--radius-sm) 0 0;
}

.table tbody td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.table tbody tr:last-child td:first-child {
    border-radius: 0 0 0 var(--radius-sm);
}

.table tbody tr:last-child td:last-child {
    border-radius: 0 0 var(--radius-sm) 0;
}

.table tbody tr:hover {
    background: var(--primary-lighter);
}

/* 价格表格 */
.price-table {
    text-align: center;
}

.price-table th {
    background: var(--primary-dark);
}

.price-highlight {
    background: linear-gradient(135deg, #e8f4fd 0%, #f0f9ff 100%);
    border-left: 4px solid var(--primary);
    font-weight: 600;
}

.price-tag {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.price-original {
    text-decoration: line-through;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ========================================
   列表样式
   ======================================== */
.org-list {
    padding: 0;
    list-style: none;
}

.org-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.org-list li:last-child {
    border-bottom: none;
}

.org-list li::before {
    content: '•';
    color: var(--primary);
    font-weight: bold;
    font-size: 1.5rem;
    line-height: 1;
}

/* 专题列表 */
.topic-list {
    list-style: none;
    padding: 0;
}

.topic-item {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.topic-item:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.topic-header {
    padding: 1.25rem 1.5rem;
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topic-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.875rem;
    margin-right: 1rem;
}

.topic-title {
    font-weight: 600;
    color: var(--primary-dark);
    flex: 1;
}

.topic-convener {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ========================================
   页脚设计
   ======================================== */
footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

footer h5 {
    color: white;
    font-weight: 600;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

footer a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    padding: 0.25rem 0;
}

footer a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-divider {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin: 2rem 0;
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* ========================================
   面包屑导航
   ======================================== */
.breadcrumb {
    background: white;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.breadcrumb-item a {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumb-item.active {
    color: var(--text-muted);
}

/* ========================================
   提醒框设计
   ======================================== */
.alert {
    border-radius: var(--radius);
    border: none;
    padding: 1.25rem 1.5rem;
    position: relative;
    overflow: hidden;
}

.alert::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
}

.alert-info {
    background: linear-gradient(135deg, #e8f4fd 0%, #f0f9ff 100%);
    color: var(--primary);
}

.alert-info::before {
    background: var(--primary);
}

.alert-warning {
    background: linear-gradient(135deg, #fffbeb 0%, #fff9f0 100%);
    color: #92400e;
}

.alert-warning::before {
    background: var(--warning);
}

.alert-success {
    background: linear-gradient(135deg, #f0fff4 0%, #f0fdf4 100%);
    color: #166534;
}

.alert-success::before {
    background: var(--success);
}

/* ========================================
   标签样式
   ======================================== */
.badge {
    font-weight: 500;
    padding: 0.5em 1em;
    border-radius: 20px;
}

/* ========================================
   分隔线
   ======================================== */
.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
    margin: 3rem 0;
}

/* ========================================
   统计数字
   ======================================== */
.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* ========================================
   滚动动画
   ======================================== */
.fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

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

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ========================================
   返回顶部按钮
   ======================================== */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    z-index: 1000;
}

#back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 86, 179, 0.4);
}

#back-to-top.show {
    display: flex;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 991px) {
    .conference-banner h1 {
        font-size: 2.25rem;
    }
    
    .conference-banner h2 {
        font-size: 1.25rem;
    }
    
    .navbar-nav {
        padding: 0.75rem;
        background: rgba(248, 250, 252, 0.95);
        border-radius: 16px;
        margin-top: 0.5rem;
        gap: 0.25rem;
    }
    
    .navbar .nav-link {
        padding: 0.75rem 1.25rem !important;
        border-radius: 12px;
        text-align: center;
    }
    
    .navbar .nav-link:hover {
        transform: none;
    }
}

@media (max-width: 768px) {
    .conference-banner {
        padding: 60px 0 50px;
    }
    
    .conference-banner h1 {
        font-size: 1.75rem;
        letter-spacing: 1px;
    }
    
    .conference-banner h2 {
        font-size: 1.1rem;
    }
    
    .conference-banner .banner-date,
    .conference-banner .banner-location {
        display: flex;
        margin: 0.5rem auto;
        width: fit-content;
        font-size: 0.95rem;
        padding: 0.6rem 1.25rem;
    }
    
    .page-banner h1 {
        font-size: 1.75rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .news-link {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .table-responsive {
        border-radius: var(--radius-sm);
        box-shadow: var(--shadow-sm);
    }
}

@media (max-width: 576px) {
    .conference-banner h1 {
        font-size: 1.5rem;
    }
    
    .quick-btn {
        font-size: 1rem;
        padding: 0.875rem 1.25rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

/* ========================================
   打印样式
   ======================================== */
@media print {
    .navbar,
    .conference-banner,
    .page-banner,
    #back-to-top,
    footer {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ========================================
   高亮文本样式 - 黑色加粗无背景
   ======================================== */
.highlight {
    color: #000;
    font-weight: 700;
}

/* ========================================
   页面布局样式
   ======================================== */

/* 页面标题区 */
.page-header {
    background: linear-gradient(135deg, #0056b3 0%, #0088ff 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-header .lead {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 0;
}

/* 主内容区 - 居中布局 */
.main-content {
    max-width: 1080px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* 内容区块 */
.content-section {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* 区块标题 */
.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0056b3;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid #0056b3;
    display: inline-block;
}

/* 表格容器 */
.table-container {
    overflow-x: auto;
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.table thead th {
    background: linear-gradient(135deg, #1e3c5f 0%, #2c5282 100%);
    color: white;
    padding: 16px;
    font-size: 14px;
    font-weight: 700;
    text-align: center;
}

.table tbody td {
    padding: 16px;
    text-align: center;
    border-bottom: 1px solid #e2e8f0;
    font-size: 14px;
    font-weight: 500;
    color: #2d3748;
}

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

.table tbody tr:hover {
    background: #f7fafc;
}

/* 注册缴费页面样式 */
.reg-qrcode-container {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    margin: 20px 0;
    border: 2px solid rgba(66, 200, 245, 0.3);
    box-shadow: 0 4px 20px rgba(66, 200, 245, 0.15);
}

.reg-qrcode-title {
    font-size: 16px;
    font-weight: 700;
    color: #1e3c5f;
    margin-bottom: 16px;
}

.reg-qrcode-img {
    max-width: 200px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.fee-box {
    background: linear-gradient(135deg, #fff9e6 0%, #fef3c7 100%);
    padding: 24px 20px;
    border-radius: 16px;
    margin-top: 20px;
    margin-bottom: 20px;
    border: 2px solid #f59e0b;
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.15);
}

.fee-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 18px;
    margin-bottom: 14px;
    background: white;
    border-radius: 12px;
    border-left: 4px solid #f59e0b;
    font-size: 14px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.fee-item:last-child {
    margin-bottom: 0;
}

.fee-label {
    color: #4a5568;
    font-weight: 600;
    line-height: 1.7;
    font-size: 15px;
}

.fee-price {
    font-weight: 800;
    color: #d97706;
    font-size: 17px;
    padding-top: 6px;
    border-top: 2px dashed rgba(217, 119, 6, 0.25);
}

.payment-method {
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    padding: 24px;
    border-radius: 16px;
    margin-top: 20px;
    margin-bottom: 20px;
    border-left: 4px solid #0056b3;
    box-shadow: 0 4px 20px rgba(0, 86, 179, 0.1);
}

.payment-title {
    font-weight: 700;
    color: #1e3c5f;
    margin-bottom: 16px;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.payment-detail {
    font-size: 15px;
    color: #4a5568;
    line-height: 2;
    margin-bottom: 16px;
    padding: 16px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.payment-detail strong {
    color: #0056b3;
}

/* 会场信息页面样式 */
.hotel-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    border: 1px solid #e0e0e0;
}

.hotel-name {
    font-weight: 700;
    color: #0056b3;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.map-link {
    color: #42c8f5;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 12px;
    padding: 10px 18px;
    background: linear-gradient(135deg, rgba(66, 200, 245, 0.1) 0%, rgba(102, 126, 234, 0.1) 100%);
    border-radius: 8px;
    border: 1px solid rgba(66, 200, 245, 0.3);
}

.map-link:hover {
    background: linear-gradient(135deg, rgba(66, 200, 245, 0.2) 0%, rgba(102, 126, 234, 0.2) 100%);
    color: #0088ff;
}

.map-link svg {
    width: 18px;
    height: 18px;
}

/* 地图弹窗样式 */
.map-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 9999;
    animation: fadeIn 0.3s ease;
    justify-content: center;
    align-items: flex-end;
}

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

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

.map-modal {
    background: white;
    width: 100%;
    max-width: 500px;
    border-radius: 20px 20px 0 0;
    padding: 0;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.map-modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.map-modal-title {
    font-size: 18px;
    font-weight: 700;
    color: #1e3c5f;
}

.map-modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #f1f5f9;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 20px;
    color: #64748b;
    transition: all 0.2s ease;
}

.map-modal-close:hover {
    background: #e2e8f0;
}

.map-modal-body {
    padding: 16px 24px 32px;
}

.map-app-item {
    display: flex;
    align-items: center;
    padding: 16px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: 12px;
    margin-bottom: 12px;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
}

.map-app-item:hover {
    background: linear-gradient(135deg, #e0f2fe 0%, #dbeafe 100%);
    transform: translateX(5px);
}

.map-app-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-right: 14px;
    flex-shrink: 0;
}

.map-app-icon.gaode { background: linear-gradient(135deg, #1e88e5 0%, #0d47a1 100%); }
.map-app-icon.baidu { background: linear-gradient(135deg, #2932e1 0%, #1a1a8c 100%); }
.map-app-icon.tencent { background: linear-gradient(135deg, #00b4ff 0%, #0084ff 100%); }

.map-app-info {
    flex: 1;
}

.map-app-name {
    font-size: 16px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 4px;
}

.map-app-desc {
    font-size: 13px;
    color: #64748b;
}

.map-app-arrow {
    color: #94a3b8;
    font-size: 20px;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #0056b3 0%, #0088ff 100%);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(0, 86, 179, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 86, 179, 0.5);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .page-header {
        padding: 40px 0;
    }
    
    .page-header h1 {
        font-size: 1.75rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .content-section {
        padding: 1.5rem;
    }
}

/* ========================================
   单页Section样式
   ======================================== */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

section {
    scroll-margin-top: 80px;
}

/* 酒店卡片样式 */
.hotel-card {
    padding: 1rem;
    background: var(--bg-light);
    border-radius: var(--radius);
}

.hotel-name {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* 价格高亮 */
.price-highlight td {
    background: linear-gradient(135deg, #e8f4fd 0%, #f0f9ff 100%);
}

/* ========================================
   滚动条美化
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}