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

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #10b981;
    --bg-color: #f9fafb;
    --sidebar-bg: #1f2937;
    --sidebar-hover: #374151;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

#app {
    display: flex;
    height: 100vh;
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: white;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.logo {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo h2 {
    font-size: 20px;
    font-weight: 600;
}

.nav-menu {
    flex: 1;
    padding: 16px 0;
    overflow-y: auto;
}

.menu-item {
    margin-bottom: 8px;
}

.menu-title {
    padding: 12px 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
    font-weight: 500;
}

.menu-title:hover {
    background: var(--sidebar-hover);
}

.arrow {
    font-size: 12px;
    transition: transform 0.3s;
}

.arrow.open {
    transform: rotate(180deg);
}

.submenu {
    list-style: none;
    background: rgba(0, 0, 0, 0.2);
}

.submenu li {
    padding: 10px 20px 10px 40px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
}

.submenu li:hover {
    background: var(--sidebar-hover);
    padding-left: 44px;
}

.submenu li.active {
    background: var(--primary-color);
    border-left: 3px solid white;
    padding-left: 41px;
}

/* ==================== 主内容区 ==================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header {
    background: white;
    padding: 20px 32px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 8px 12px;
    background: #f3f4f6;
    border-radius: 6px;
}

/* ==================== 登录界面 ==================== */
.login-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.login-box {
    background: white;
    border-radius: 16px;
    padding: 48px 40px;
    width: 90%;
    max-width: 420px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.4s ease-out;
}

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

.login-box h2 {
    text-align: center;
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 32px;
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-primary);
}

.login-form input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.captcha-group {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.captcha-input {
    flex: 1;
}

.captcha-display {
    width: 120px;
    height: 46px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
    user-select: none;
}

.captcha-display:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.captcha-text {
    font-size: 24px;
    font-weight: 700;
    color: white;
    letter-spacing: 8px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.captcha-refresh {
    position: absolute;
    top: 4px;
    right: 4px;
    font-size: 12px;
    opacity: 0.8;
}

.error-message {
    background: #fee;
    color: #c33;
    padding: 12px;
    border-radius: 6px;
    font-size: 14px;
    margin-bottom: 16px;
    border-left: 3px solid #c33;
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 8px;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

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

/* ==================== 搜索栏 ==================== */
.search-bar {
    padding: 16px 32px;
    background: white;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-field-select {
    min-width: 140px;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background: white;
    cursor: pointer;
    transition: all 0.2s;
}

.search-field-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-input-wrapper {
    flex: 1;
    max-width: 500px;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 10px 40px 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn-clear {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 18px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.btn-clear:hover {
    background: #f3f4f6;
    color: var(--text-primary);
}

.search-result-info {
    padding: 12px 0;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.search-result-info strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* ==================== 按钮 ==================== */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    outline: none;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: #e5e7eb;
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #d1d5db;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
    margin-right: 6px;
}

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

.btn-edit:hover {
    background: #059669;
}

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

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

/* ==================== 表格 ==================== */
.table-container {
    flex: 1;
    padding: 24px 32px;
    overflow-y: auto;
    background: var(--bg-color);
}

.data-table {
    width: 100%;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border-collapse: collapse;
}

.data-table thead {
    background: #f3f4f6;
}

.data-table th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}

.data-table tbody tr {
    transition: background 0.2s;
}

.data-table tbody tr:hover {
    background: #f9fafb;
}

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

.data-table tbody tr:empty::after {
    content: '暂无数据';
    display: block;
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    font-size: 14px;
}

/* ==================== 分页 ==================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-top: 24px;
    padding: 16px;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.pagination button {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.pagination button:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

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

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

/* ==================== 模态框 ==================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.2s;
}

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

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    animation: slideUp 0.3s;
}

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

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

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

.close-btn {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all 0.2s;
}

.close-btn:hover {
    background: #f3f4f6;
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
    max-height: calc(90vh - 160px);
    overflow-y: auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

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

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

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* ==================== 搜索下拉框 ==================== */
.form-group {
    position: relative;
}

.dropdown-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 300px;
    overflow-y: auto;
    background: white;
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 6px 6px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    margin-top: -1px;
}

.dropdown-item {
    padding: 10px 12px;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 14px;
    border-bottom: 1px solid #f3f4f6;
}

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

.dropdown-item:hover:not(.disabled) {
    background: #f3f4f6;
}

.dropdown-item.disabled {
    color: var(--text-secondary);
    cursor: not-allowed;
    font-style: italic;
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    
    .header {
        padding: 16px 20px;
    }
    
    .header h1 {
        font-size: 20px;
    }
    
    .search-bar {
        padding: 12px 20px;
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-field-select {
        width: 100%;
    }
    
    .search-input-wrapper {
        max-width: 100%;
    }
    
    .table-container {
        padding: 16px 20px;
    }
    
    .data-table {
        font-size: 13px;
    }
    
    .data-table th,
    .data-table td {
        padding: 10px 12px;
    }
}