/* ===== 基础样式重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: #333;
    background-color: #f7f9fc;
}

a {
    text-decoration: none;
    color: #2a5298;
    transition: color 0.3s;
}

a:hover {
    color: #1e3c72;
}

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.3s;
}

input, select, textarea {
    outline: none;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    padding: 6px 12px;
    font-size: 14px;
    transition: all 0.3s;
}

input:focus, select:focus, textarea:focus {
    border-color: #2a5298;
    box-shadow: 0 0 0 3px rgba(42, 82, 152, 0.1);
}

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

/* ===== 通用类 ===== */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.hidden {
    display: none;
}

/* ===== 卡片 ===== */
.card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(30, 60, 114, 0.08);
    padding: 28px;
    margin-bottom: 24px;
    border: 1px solid #f0f0f0;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 24px rgba(30, 60, 114, 0.12);
}

.card-header {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid #f5f7fa;
    color: #1e3c72;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 8px 16px;
    font-size: 14px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    box-shadow: 0 2px 8px rgba(30, 60, 114, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 60, 114, 0.3);
}

.btn-success {
    background: #52c41a;
    color: #fff;
}

.btn-success:hover {
    background: #73d13d;
}

.btn-danger {
    background: #ff4d4f;
    color: #fff;
}

.btn-danger:hover {
    background: #ff7875;
}

/* ===== 表格 ===== */
.table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid #e8e8e8;
}

.table th {
    background: #fafafa;
    font-weight: 600;
    color: #333;
}

.table tbody tr:hover {
    background: #f5f5f5;
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: #2a5298;
    box-shadow: 0 0 0 3px rgba(42, 82, 152, 0.1);
}

/* ===== 消息提示 ===== */
.alert {
    padding: 12px 16px;
    border-radius: 4px;
    margin-bottom: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-close {
    background: transparent;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: inherit;
    opacity: 0.5;
    padding: 0 4px;
}

.alert-close:hover {
    opacity: 1;
}

.alert-success {
    background: #f6ffed;
    border: 1px solid #b7eb8f;
    color: #52c41a;
}

.alert-error {
    background: #fff2f0;
    border: 1px solid #ffccc7;
    color: #ff4d4f;
}

.alert-warning {
    background: #fffbe6;
    border: 1px solid #ffe58f;
    color: #faad14;
}

.alert-info {
    background: #e6f7ff;
    border: 1px solid #91d5ff;
    color: #1890ff;
}