/* 全局样式 */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
    --danger: #ef4444;
    --success: #10b981;
    --radius: 8px;
}

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

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

/* 顶部导航 */
.header {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: white;
    padding: 0 24px;
    height: 64px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

/* 主容器 */
.main-container {
    display: flex;
    margin-top: 64px;
    min-height: calc(100vh - 64px);
}

/* 侧边栏 */
.sidebar {
    width: 280px;
    background: var(--card-bg);
    padding: 24px;
    border-right: 1px solid var(--border-color);
    position: fixed;
    top: 64px;
    left: 0;
    bottom: 0;
    overflow-y: auto;
}

.search-box h3 {
    font-size: 16px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
    transition: all 0.2s;
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
}

/* 主内容区 */
.content {
    flex: 1;
    margin-left: 280px;
    padding: 24px;
    max-width: calc(100% - 280px);
}

.content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.content-header h2 {
    font-size: 24px;
    font-weight: 600;
}

.total-count {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 活动卡片网格 */
.activity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.activity-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid transparent;
}

.activity-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.card-image {
    height: 160px;
    background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-image .placeholder {
    font-size: 48px;
    color: var(--primary-color);
    opacity: 0.5;
}

.card-body {
    padding: 16px;
}

.card-type {
    display: inline-block;
    padding: 4px 10px;
    background: #eff6ff;
    color: var(--primary-color);
    font-size: 12px;
    border-radius: 20px;
    margin-bottom: 8px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-info {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.card-info span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
}

.card-tag {
    padding: 2px 8px;
    background: #f1f5f9;
    color: var(--text-secondary);
    font-size: 12px;
    border-radius: 4px;
}

.card-actions {
    padding: 12px 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
}

.card-actions .btn {
    flex: 1;
    padding: 8px;
    font-size: 13px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background: #f1f5f9;
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: #e2e8f0;
}

.btn-danger {
    background: #fef2f2;
    color: var(--danger);
}

.btn-danger:hover {
    background: #fee2e2;
}

.btn-success {
    background: #ecfdf5;
    color: var(--success);
}

.btn-block {
    width: 100%;
    margin-bottom: 8px;
}

.icon {
    font-size: 18px;
    font-weight: 300;
}

/* 弹窗 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 200;
    overflow-y: auto;
    padding: 40px 20px;
}

.modal.active {
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 600px;
    animation: slideUp 0.3s ease;
}

.modal-large {
    max-width: 800px;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    padding: 0;
}

.close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* 表单样式 */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

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

.file-upload {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: all 0.2s;
}

.file-upload:hover {
    border-color: var(--primary-color);
}

.file-upload input[type="file"] {
    width: 100%;
}

.file-info {
    margin-top: 10px;
    padding: 8px;
    background: #f8fafc;
    border-radius: 4px;
    font-size: 13px;
    color: var(--text-secondary);
}

.photo-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}

.photo-preview img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 32px;
}

.pagination button {
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
}

.pagination button:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.pagination button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 详情页样式 */
.detail-section {
    margin-bottom: 24px;
}

.detail-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.detail-row {
    display: flex;
    padding: 8px 0;
}

.detail-label {
    width: 100px;
    font-weight: 500;
    color: var(--text-secondary);
}

.detail-value {
    flex: 1;
}

.detail-photos {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
}

.detail-photos img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* 响应式 */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
    .content {
        margin-left: 240px;
        max-width: calc(100% - 240px);
    }
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    .content {
        margin-left: 0;
        max-width: 100%;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .modal-content {
        margin: 10px;
    }
}

/* 删除确认弹窗 */
.confirm-modal .modal-body {
    text-align: center;
    padding: 40px;
}

.confirm-modal .warning-icon {
    font-size: 48px;
    color: var(--danger);
    margin-bottom: 16px;
}

/* 头部右侧 */
.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info {
    color: white;
    font-size: 14px;
}

/* 功能导航横幅 */
.nav-banner {
    background: linear-gradient(135deg, #1e3a5f, #2563eb);
    padding: 20px;
    margin-top: 20px;
}

.nav-items {
    display: flex;
    justify-content: center;
    gap: 60px;
    max-width: 800px;
    margin: 0 auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s;
    color: white;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

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

.nav-icon {
    font-size: 28px;
}

.nav-text {
    font-size: 16px;
    font-weight: 500;
}

/* 版权信息 */
.footer {
    text-align: center;
    padding: 24px;
    background: #1e293b;
    color: #94a3b8;
    margin-top: auto;
}

.footer p {
    font-size: 14px;
}

/* 用户管理样式 */
.user-badge {
    display: inline-block;
    padding: 2px 8px;
    background: #10b981;
    color: white;
    font-size: 12px;
    border-radius: 4px;
    margin-left: 8px;
}

.user-badge.pending {
    background: #f59e0b;
}

/* 用户列表 */
.user-list {
    padding: 20px;
}

.user-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: white;
    border-radius: var(--radius);
    margin-bottom: 8px;
    box-shadow: var(--shadow);
}

.user-item .info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.user-item .username {
    font-weight: 600;
}

.user-item .realname {
    font-size: 13px;
    color: var(--text-secondary);
}

.user-item .status {
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
}

.user-item .status.approved {
    background: #ecfdf5;
    color: #059669;
}

.user-item .status.pending {
    background: #fef3c7;
    color: #d97706;
}

.user-item .actions {
    display: flex;
    gap: 8px;
}

/* 欢迎页面 */
.welcome-container {
    padding: 60px 20px;
    text-align: center;
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.welcome-content {
    max-width: 600px;
    margin: 0 auto;
}

.welcome-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.welcome-content h2 {
    font-size: 28px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.welcome-content p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.welcome-options {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}

.welcome-option {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 40px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
    max-width: 320px;
}

.welcome-option:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
    border: 2px solid var(--primary-color);
}

.option-icon {
    font-size: 32px;
}

.option-text {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-primary);
}