/* 矿业科技发展高峰论坛 - 响应式样式 */

:root {
    --primary-color: #1a5f7a;
    --primary-dark: #0d3d52;
    --secondary-color: #c9a227;
    --text-color: #333;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --white: #fff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 20px rgba(0,0,0,0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-light);
}

a {
    text-decoration: none;
    color: inherit;
}

/* 顶部公司信息条 */
.top-bar {
    background: var(--primary-dark);
    color: var(--white);
    padding: 0.5rem 0;
    font-size: 0.85rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.top-bar .company-name {
    font-weight: 500;
    letter-spacing: 0.5px;
}

.top-bar .company-slogan {
    opacity: 0.8;
    font-size: 0.8rem;
}

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.navbar .logo {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar .logo-icon {
    width: 40px;
    height: 40px;
    background: var(--secondary-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.navbar .nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.navbar .nav-links a {
    color: var(--white);
    opacity: 0.9;
    transition: opacity 0.3s;
}

.navbar .nav-links a:hover {
    opacity: 1;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Banner 区域 */
.banner {
    position: relative;
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 70%, #052430 100%);
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

/* 默认渐变背景的装饰图案 */
.banner:not(.has-image)::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(201, 162, 39, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(26, 95, 122, 0.3) 0%, transparent 50%),
        url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M40 40c0-11.046-8.954-20-20-20s-20 8.954-20 20 8.954 20 20 20 20-8.954 20-20zm-40 0c0-11.046-8.954-20-20-20s-20 8.954-20 20 8.954 20 20 20 20-8.954 20-20z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* 图片背景的遮罩层 */
.banner.has-image .banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(13, 61, 82, 0.75) 0%, rgba(5, 36, 48, 0.6) 100%);
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.banner-content {
    position: relative;
    z-index: 2;
    padding: 4rem 1rem;
}

.banner-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.4);
    letter-spacing: 2px;
    line-height: 1.3;
}

.banner-subtitle {
    font-size: 1.4rem;
    opacity: 0.95;
    margin-bottom: 2rem;
    font-weight: 300;
    letter-spacing: 4px;
    text-shadow: 1px 1px 4px rgba(0,0,0,0.4);
}

.banner-decoration {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.banner-decoration .decoration-line {
    display: block;
    width: 60px;
    height: 2px;
    background: var(--secondary-color);
}

.banner-decoration .decoration-diamond {
    display: block;
    width: 10px;
    height: 10px;
    background: var(--secondary-color);
    transform: rotate(45deg);
}

/* 会议列表区域 */
.conferences-section {
    padding: 3rem 0;
}

.section-title {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--secondary-color);
    display: inline-block;
}

.conference-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.conference-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--border-color);
}

.conference-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.conference-card .card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 1.25rem;
    position: relative;
}

.conference-card .card-header.status-0 {
    background: linear-gradient(135deg, #6c757d, #495057);
}

.conference-card .card-header.status-1 {
    background: linear-gradient(135deg, #28a745, #1e7e34);
}

.conference-card .card-header.status-2 {
    background: linear-gradient(135deg, #6c757d, #495057);
}

.conference-card .badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--secondary-color);
    color: var(--text-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.conference-card .badge.ended {
    background: #6c757d;
    color: var(--white);
}

.conference-card .badge.ongoing {
    background: #e74c3c;
    color: var(--white);
}

.conference-card .badge.upcoming {
    background: var(--warning-color);
}

.conference-card .badge.registering {
    background: var(--success-color);
    color: var(--white);
}

.conference-card .card-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    padding-right: 80px;
}

.conference-card .card-date {
    font-size: 0.9rem;
    opacity: 0.9;
}

.conference-card .card-body {
    padding: 1.25rem;
}

.conference-card .card-location {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.conference-card .card-desc {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.conference-card .card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.conference-card .btn {
    padding: 0.5rem 1.25rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    font-size: 0.9rem;
}

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

.conference-card .btn-primary:hover {
    background: var(--primary-dark);
}

.conference-card .btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.conference-card .btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
}

/* 详情页 */
.detail-hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 3rem 1rem;
}

.detail-hero h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.detail-hero .meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 1rem;
    opacity: 0.95;
}

.detail-content {
    padding: 2rem 0;
}

.detail-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
}

.detail-tabs .tab-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-light);
    cursor: pointer;
    font-size: 1rem;
    border-radius: 6px 6px 0 0;
    transition: all 0.3s;
}

.detail-tabs .tab-btn:hover,
.detail-tabs .tab-btn.active {
    background: var(--primary-color);
    color: var(--white);
}

.tab-content {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.tab-content h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.tab-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* 嘉宾卡片 */
.guest-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.guest-card {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.3s;
}

.guest-card:hover {
    transform: translateY(-5px);
}

.guest-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2rem;
    font-weight: 700;
}

.guest-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-color);
}

.guest-title {
    font-size: 0.9rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.guest-intro {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* 赞助商 */
.sponsor-list {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.sponsor-item {
    background: var(--bg-light);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
}

.sponsor-name {
    font-weight: 600;
    color: var(--text-color);
}

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

/* 报名表单 */
.registration-form {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.registration-form h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

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

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

.btn-submit {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 多选框样式 */
.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 0.5rem;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: normal;
}

.checkbox-item:hover {
    border-color: var(--primary-color);
    background: rgba(30, 58, 138, 0.05);
}

.checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.checkbox-item input[type="checkbox"]:checked + span {
    color: var(--primary-color);
    font-weight: 500;
}

/* 后台管理 */
.admin-header {
    background: var(--primary-dark);
    color: var(--white);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-header .logo {
    font-size: 1.25rem;
    font-weight: 600;
}

.admin-header .user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.admin-header .logout-btn {
    background: rgba(255,255,255,0.2);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
}

.admin-container {
    display: flex;
    min-height: calc(100vh - 60px);
}

.admin-sidebar {
    width: 220px;
    background: var(--white);
    border-right: 1px solid var(--border-color);
    padding: 1rem 0;
}

.admin-sidebar .nav-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-color);
    transition: all 0.3s;
}

.admin-sidebar .nav-item:hover,
.admin-sidebar .nav-item.active {
    background: var(--primary-color);
    color: var(--white);
}

.admin-main {
    flex: 1;
    padding: 1.5rem;
    background: var(--bg-light);
}

.admin-card {
    background: var(--white);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.admin-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

/* 表格 */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-light);
    font-weight: 600;
    color: var(--text-color);
}

.data-table tr:hover {
    background: var(--bg-light);
}

/* 登录页 */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.login-box {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.login-box h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

/* 提示信息 */
.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* 页脚 */
.footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: 2.5rem 1rem;
    text-align: center;
    margin-top: 3rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.footer-info {
    flex: 1;
    min-width: 200px;
    text-align: left;
}

.footer-qr {
    flex-shrink: 0;
    text-align: center;
}

.footer-qr img {
    border: 2px solid rgba(255,255,255,0.2);
}

.footer-company {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-company h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.footer p {
    opacity: 0.8;
    margin-bottom: 0.5rem;
}

.footer a {
    color: var(--secondary-color);
}

@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    .footer-info {
        text-align: center;
    }
}

/* 关于展会页面 */
.page-hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 3rem 1rem;
    text-align: center;
}

.page-hero h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    letter-spacing: 2px;
}

.page-hero p {
    font-size: 1.1rem;
    opacity: 0.9;
    letter-spacing: 2px;
}

.about-section {
    padding: 3rem 0;
}

.about-content {
    background: var(--white);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    line-height: 1.9;
    font-size: 1.05rem;
}

.about-content h2,
.about-content h3,
.about-content h4 {
    color: var(--primary-color);
    margin: 1.5rem 0 1rem;
}

.about-content p {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.about-content strong {
    color: var(--primary-color);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-item {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 2rem 1rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
    letter-spacing: 1px;
}

.about-contact {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.about-contact h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 8px;
}

.contact-icon {
    font-size: 2rem;
}

.contact-label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
}

.contact-value {
    font-size: 1.1rem;
    color: var(--text-color);
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .top-bar .container {
        justify-content: center;
        text-align: center;
    }

    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .navbar .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .banner {
        min-height: 300px;
    }

    .banner-content {
        padding: 2.5rem 1rem;
    }

    .banner-title {
        font-size: 2rem;
        letter-spacing: 1px;
    }

    .banner-subtitle {
        font-size: 1.1rem;
        letter-spacing: 2px;
    }

    .banner-decoration .decoration-line {
        width: 40px;
    }

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

    .detail-hero h1 {
        font-size: 1.5rem;
    }

    .detail-hero .meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .detail-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.5rem;
    }

    .detail-tabs .tab-btn {
        white-space: nowrap;
        font-size: 0.9rem;
        padding: 0.5rem 1rem;
    }

    .tab-content {
        padding: 1.25rem;
    }

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

    .admin-container {
        flex-direction: column;
    }

    .admin-sidebar {
        width: 100%;
        display: flex;
        overflow-x: auto;
        padding: 0.5rem;
    }

    .admin-sidebar .nav-item {
        white-space: nowrap;
        border-radius: 4px;
    }

    .data-table {
        display: block;
        overflow-x: auto;
    }
}

@media (max-width: 480px) {
    .banner {
        min-height: 240px;
    }

    .banner-title {
        font-size: 1.6rem;
    }

    .banner-subtitle {
        font-size: 0.95rem;
        letter-spacing: 1px;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .conference-card .card-footer {
        flex-direction: column;
        gap: 0.75rem;
    }

    .conference-card .btn {
        width: 100%;
        text-align: center;
    }
}