body {
    background-color: #f6f8fa;
    font-family: 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif;
}

.card {
    border-radius: 1rem;
    box-shadow: 0 2px 16px 0 rgba(60,72,88,.08);
    border: none;
}

.navbar {
    border-radius: 0 0 1rem 1rem;
    box-shadow: 0 2px 8px 0 rgba(60,72,88,.08);
}

.footer {
    border-radius: 1rem 1rem 0 0;
    box-shadow: 0 -2px 8px 0 rgba(60,72,88,.04);
}

.btn-primary, .btn-primary:focus, .btn-primary:active {
    background: linear-gradient(90deg, #4f8cff 0%, #3358ff 100%);
    border: none;
    box-shadow: 0 2px 8px 0 rgba(79,140,255,.15);
}

.btn-primary:hover {
    background: linear-gradient(90deg, #3358ff 0%, #4f8cff 100%);
}

.form-control, .form-select {
    border-radius: 0.5rem;
    box-shadow: none;
    border: 1px solid #e3e6ea;
    transition: border-color .2s;
}

.form-control:focus, .form-select:focus {
    border-color: #4f8cff;
    box-shadow: 0 0 0 2px rgba(79,140,255,.08);
}

.table {
    border-radius: 0.5rem;
    overflow: hidden;
    background: #fff;
}

.table-striped > tbody > tr:nth-of-type(odd) {
    background-color: #f2f6fc;
}

.table-hover > tbody > tr:hover {
    background-color: #eaf1fb;
}

.avatar {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 50%;
    background: #4f8cff;
    color: #fff;
}

.shadow-sm {
    box-shadow: 0 2px 8px 0 rgba(60,72,88,.08)!important;
}

/* 适当增加内容区留白 */
main.container {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 2rem;
    padding-bottom: 2rem;
}

/* 功能色块/高明度卡片 */
.card-feature {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 2px 16px 0 rgba(60,72,88,.08);
    color: #222;
    padding: 1.5rem 1.2rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
    font-size: 1.1rem;
    transition: box-shadow .2s;
}
.card-feature-blue {
    background: linear-gradient(90deg, #e3f0ff 0%, #f5faff 100%);
    color: #2563eb;
}
.card-feature-green {
    background: linear-gradient(90deg, #e6f9f0 0%, #f6fff9 100%);
    color: #059669;
}
.card-feature-orange {
    background: linear-gradient(90deg, #fff7e6 0%, #fffaf5 100%);
    color: #d97706;
}
.card-feature-purple {
    background: linear-gradient(90deg, #f3e8ff 0%, #faf5ff 100%);
    color: #7c3aed;
}
.card-feature:hover {
    box-shadow: 0 4px 24px 0 rgba(60,72,88,.16);
}