body {
    background: #ffffff; /* 纯白底，简洁 */
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #111827; /* 温和的深色文字 */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 头部：白底 + 细线 + 轻微投影，避免强烈渐变 */
.header {
    background: #ffffff;
    color: #0f1724;
    padding: 20px 24px;
    text-align: left;
    box-shadow: 0 1px 8px rgba(16,24,40,0.04);
    border-bottom: 1px solid rgba(15,23,36,0.06);
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-logo {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    border-radius: 10px;
    background: rgba(30,136,255,0.06); /* 轻微色调点缀 */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(15,23,36,0.04);
}

.header-logo svg { width: 24px; height: 24px; fill: #1e88ff; opacity: 0.95; }

.header .title {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: 0.2px;
    margin: 0;
    color: #0b1220;
}

.header .subtitle {
    font-size: 0.875rem;
    font-weight: 500;
    color: #475569;
    margin-top: 2px;
}

/* 主体容器：白色卡片 + 细边框 + 软阴影，提升层次但是很克制 */
.main {
    background: #ffffff;
    margin: 32px auto;
    padding: 28px;
    max-width: 1200px;
    border-radius: 10px;
    border: 1px solid rgba(15,23,36,0.04);
    box-shadow: 0 8px 30px rgba(16,24,40,0.04);
}

/* 品牌区标题：小清晰分割线 */
.brand-section {
    margin-bottom: 32px;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
}

.brand-section h2 {
    color: #0b1220;
    border-bottom: 1px solid rgba(15,23,36,0.04);
    padding-bottom: 12px;
    margin-bottom: 20px;
    font-weight: 600;
}

/* 模型网格：保持简洁的列布局 */
.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
}

/* 卡片：白底 + 细边框 + 轻微阴影，左侧细条作为识别（更克制） */
.model-card {
    display: flex;
    flex-direction: row;
    align-items: center;
    text-decoration: none;
    color: inherit;
    background: #ffffff;
    border-radius: 8px;
    transition: box-shadow 0.12s ease, border-left-color 0.12s ease;
    box-shadow: 0 1px 2px rgba(16,24,40,0.03);
    padding: 14px;
    border: 1px solid rgba(15,23,36,0.04);
    border-left: 4px solid rgba(30,136,255,0.08); /* 细腻的左侧色带 */
}

/* 悬停/聚焦：非常细腻的提升阴影，不变形 */
.model-card:hover,
.model-card:active,
.model-card:focus,
.model-card.selected {
    background-color: #ffffff;
    transform: none;
    box-shadow: 0 8px 24px rgba(16,24,40,0.06);
    outline: none;
    border-left-color: rgba(30,136,255,0.18);
}

/* 图标：保持等比例、清晰 */
.model-icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    margin-right: 12px;
    background-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 0;
    border-radius: 6px;
    border: 1px solid rgba(15,23,36,0.02);
}

.model-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    image-rendering: auto;
}

.model-card h3 {
    margin: 0;
    color: #0b1220;
    font-size: 0.95rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: left;
    flex-grow: 1;
}

/* ========================
   页脚
   ======================== */
.footer {
    text-align: center;
    color: #94a3b8;
    font-size: 0.9rem;
    padding: 24px 0 16px 0;
}