html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}

/* 品牌展示区 */
.brand-section {
    background-color: #f8f9fa;
    padding: 10px 0;
    margin-bottom: 10px;
}

.brand-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #333;
    letter-spacing: 3px;
    margin-bottom: 2rem;
    position: relative;
}

    .brand-title::after {
        content: '';
        display: block;
        width: 60px;
        height: 3px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        margin: 12px auto 0;
        border-radius: 2px;
    }

.brand-card {
    background: #fff;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    padding: 20px 15px;
    transition: all 0.3s ease;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .brand-card:hover {
        border-color: #667eea;
        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.15);
        transform: translateY(-5px);
    }

    .brand-card img {
        max-width: 100%;
        max-height: 45px;
        object-fit: contain;
        filter: grayscale(0%);
        transition: filter 0.3s;
    }

    .brand-card:hover img {
        filter: grayscale(0%);
    }

/* 主内容区 */
.main-container {
    min-height: 500px;
    padding-bottom: 3rem;
}