/* 公共样式 */
:root {
    --primary: #4a6ee0;
    --primary-dark: #3a5bc7;
    --secondary: #6c757d;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --info: #17a2b8;
    --light: #f8f9fa;
    --dark: #343a40;
    --white: #ffffff;
    --border-radius: 8px;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 5px 20px rgba(0,0,0,0.15);
}

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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
    min-height: 100vh;
    color: var(--dark);
}

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.navbar select {
    padding: 6px 12px;
    border: none;
    border-radius: var(--border-radius);
    background: rgba(255,255,255,0.2);
    color: var(--white);
    font-size: 14px;
    cursor: pointer;
}

.navbar select option {
    color: var(--dark);
}

.navbar-btn {
    padding: 6px 14px;
    border: none;
    border-radius: var(--border-radius);
    background: rgba(255,255,255,0.2);
    color: var(--white);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.navbar-btn:hover {
    background: rgba(255,255,255,0.3);
}

/* 容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* 卡片 */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-header {
    padding: 15px 20px;
    background: var(--light);
    border-bottom: 1px solid #eee;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-body {
    padding: 20px;
}

/* 按钮 */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

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

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

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

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

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

/* 表单 */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 15px 20px;
    background: var(--primary);
    color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--white);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    background: var(--light);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

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

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

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

.table tr:hover {
    background: #f8f9fa;
}

/* 网格布局 */
.grid {
    display: grid;
    gap: 20px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* 徽章 */
.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-primary { background: var(--primary); color: var(--white); }
.badge-success { background: var(--success); color: var(--white); }
.badge-warning { background: var(--warning); color: var(--dark); }
.badge-danger { background: var(--danger); color: var(--white); }

/* 提示消息 */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    border-radius: var(--border-radius);
    color: var(--white);
    font-size: 14px;
    z-index: 2000;
    animation: toastIn 0.3s ease;
    white-space: nowrap;
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-warning { background: var(--warning); color: var(--dark); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

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

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

.empty-icon {
    font-size: 48px;
    margin-bottom: 15px;
    opacity: 0.5;
}

/* 工具类 */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.flex { display: flex; }
.flex-between { justify-content: space-between; }
.flex-center { justify-content: center; align-items: center; }
.gap-10 { gap: 10px; }
.gap-20 { gap: 20px; }

/* ========== 手机端通用适配 ========== */
@media (max-width: 768px) {
    html { font-size: 14px; }
    body { font-size: 14px; }

    .container { padding: 10px; }

    .card-body { padding: 12px; }
    .card-header { padding: 10px 12px; font-size: 14px; }

    .modal-content {
        width: 100% !important;
        max-width: 100% !important;
        max-height: 100vh;
        border-radius: 0;
    }
    .modal-header { padding: 12px 16px; }
    .modal-header h3 { font-size: 15px; }
    .modal-body { padding: 16px; }
    .modal-footer { padding: 12px 16px; flex-wrap: wrap; }

    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .table th, .table td {
        padding: 8px 10px;
        font-size: 13px;
        white-space: nowrap;
    }

    .btn { padding: 6px 12px; font-size: 13px; }
    .btn-lg { padding: 10px 18px; font-size: 14px; }

    .form-control { font-size: 16px; padding: 10px; }
    .form-group label { font-size: 13px; }
}

@media (max-width: 480px) {
    html { font-size: 13px; }
    .container { padding: 6px; }
}