/* FileShare - 简洁实用风格 */

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部 */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 30px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 24px;
    font-weight: 600;
}

.nav {
    display: flex;
    gap: 24px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

/* 搜索区域 */
.search-section {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.search-box {
    flex: 1;
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0 16px;
    gap: 8px;
}

.search-box svg {
    color: var(--text-secondary);
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    padding: 12px 0;
    font-size: 14px;
    background: transparent;
}

.filter-box {
    min-width: 150px;
}

.filter-select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    font-size: 14px;
    cursor: pointer;
    outline: none;
}

/* 统计条 */
.stats-bar {
    display: flex;
    gap: 24px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-value {
    font-size: 28px;
    font-weight: 600;
    color: var(--primary-color);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* 文件列表 */
.file-list {
    display: grid;
    gap: 16px;
}

.file-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s, transform 0.2s;
}

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

.file-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border-radius: 10px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.file-category {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    color: var(--primary-color);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
}

.file-stats {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.download-count {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 14px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
    flex-shrink: 0;
}

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

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state svg {
    margin-bottom: 16px;
    opacity: 0.5;
}

/* 登录页面 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

.login-card h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.error-message {
    background: #fef2f2;
    color: var(--danger-color);
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus {
    border-color: var(--primary-color);
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

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

/* 管理后台 */
.upload-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.upload-section h2 {
    margin-bottom: 20px;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #eff6ff, #f0f9ff);
}

.upload-area svg {
    color: var(--primary-color);
    margin-bottom: 16px;
}

.upload-area p {
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 8px;
}

.upload-hint {
    color: var(--text-secondary);
    font-size: 13px;
}

.category-select {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
}

.category-select label {
    font-weight: 500;
}

.category-select select {
    flex: 1;
    max-width: 300px;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
}

.btn-add-category {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 8px;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.btn-add-category:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.upload-progress {
    margin-top: 20px;
}

.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.3s;
}

/* 文件表格 */
.admin-file-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-header h2 {
    margin: 0;
}

.file-table-container {
    overflow-x: auto;
}

.file-table {
    width: 100%;
    border-collapse: collapse;
}

.file-table th,
.file-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.file-table th {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 13px;
    background: var(--bg-color);
}

.file-table td {
    font-size: 14px;
}

.file-table tr:hover {
    background: var(--bg-color);
}

.file-table-actions {
    display: flex;
    gap: 8px;
}

.btn-delete {
    padding: 6px 12px;
    background: #fef2f2;
    color: var(--danger-color);
    border: none;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-delete:hover {
    background: var(--danger-color);
    color: white;
}

/* 弹窗 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
}

.modal-content h3 {
    margin-bottom: 20px;
}

.modal-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 20px;
    outline: none;
}

.modal-input:focus {
    border-color: var(--primary-color);
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.btn-cancel,
.btn-confirm {
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-cancel {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-cancel:hover {
    background: var(--border-color);
}

.btn-confirm {
    background: var(--primary-color);
    border: none;
    color: white;
}

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

/* 统计页面 */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.stat-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border-radius: 12px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 32px;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.stats-section {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.stats-section h2 {
    margin-bottom: 20px;
    font-size: 18px;
}

.category-stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.category-bar {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.category-info {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
}

.category-name {
    font-weight: 500;
}

.category-count {
    color: var(--text-secondary);
}

.category-bar-bg {
    height: 10px;
    background: var(--border-color);
    border-radius: 5px;
    overflow: hidden;
}

.category-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #60a5fa);
    border-radius: 5px;
    transition: width 0.5s ease;
}

.top-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.top-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    background: var(--bg-color);
    border-radius: 8px;
}

.top-rank {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
    min-width: 30px;
}

.top-name {
    flex: 1;
    font-size: 14px;
}

.top-count {
    color: var(--text-secondary);
    font-size: 13px;
}

.back-home {
    text-align: center;
    margin-top: 30px;
}

.btn-home {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 16px;
    }

    .nav {
        width: 100%;
        justify-content: center;
    }

    .search-section {
        flex-direction: column;
    }

    .filter-box {
        min-width: 100%;
    }

    .stats-bar {
        flex-direction: column;
        gap: 16px;
    }

    .file-card {
        flex-wrap: wrap;
    }

    .file-info {
        min-width: calc(100% - 80px);
    }

    .file-stats {
        width: 100%;
        justify-content: flex-end;
    }

    .download-btn {
        width: 100%;
        justify-content: center;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        width: 100%;
    }

    .file-table {
        font-size: 13px;
    }

    .file-table th,
    .file-table td {
        padding: 10px 8px;
    }
}