:root {
    --nav-primary: #4f46e5;
    --nav-primary-dark: #4338ca;
    --nav-bg: #f3f5f9;
    --nav-text: #1f2937;
    --nav-muted: #6b7280;
    --nav-card: #ffffff;
    --nav-border: #e5e7eb;
}

* { box-sizing: border-box; }

body.home-body {
    margin: 0;
    background: var(--nav-bg);
    color: var(--nav-text);
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    min-height: 100vh;
}

.home-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: #fff;
    border-bottom: 1px solid var(--nav-border);
    padding: 0.85rem 0;
}

.home-nav .brand {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--nav-text);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.15rem;
    white-space: nowrap;
}

.home-nav .brand i {
    color: var(--nav-primary);
    font-size: 1.35rem;
}

.search-box {
    position: relative;
    flex: 1;
    max-width: 420px;
}

.search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
}

.search-box input {
    padding-left: 2.1rem;
    border-radius: 999px;
    background: #f3f4f6;
    border-color: transparent;
}

.search-box input:focus {
    background: #fff;
    border-color: #c7d2fe;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.home-lead {
    background: linear-gradient(180deg, #eef2ff 0%, var(--nav-bg) 100%);
    padding: 1rem 0 0.25rem;
    color: var(--nav-muted);
}

.cat-pills-wrap {
    position: sticky;
    top: 64px;
    z-index: 90;
    background: rgba(243, 245, 249, 0.92);
    backdrop-filter: blur(8px);
    padding: 0.75rem 0;
}

.cat-pills {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 2px;
}

.cat-pill {
    flex: 0 0 auto;
    padding: 0.28rem 0.9rem;
    border-radius: 999px;
    background: #fff;
    color: var(--nav-text);
    text-decoration: none;
    border: 1px solid var(--nav-border);
    font-size: 0.9rem;
}

.cat-pill:hover {
    border-color: var(--nav-primary);
    color: var(--nav-primary);
}

.home-main {
    padding: 0.5rem 0 3rem;
}

.cat-block {
    margin-bottom: 1.25rem;
}

.cat-level-1 {
    margin-top: 1.5rem;
}

.cat-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    margin: 0 0 1rem;
}

.cat-level-1 > .cat-title {
    font-size: 1.35rem;
}

.cat-level-2 > .cat-title {
    font-size: 1.08rem;
    margin-top: 1.25rem;
}

.cat-level-3 > .cat-title {
    font-size: 0.95rem;
    color: var(--nav-muted);
    margin-top: 1rem;
}

.cat-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--nav-primary);
    display: inline-block;
}

.cat-level-2 .cat-dot { background: #818cf8; }
.cat-level-3 .cat-dot { background: #c7d2fe; }

.site-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--nav-card);
    border: 1px solid transparent;
    border-radius: 12px;
    padding: 0.85rem 0.95rem;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
    height: 100%;
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}

.site-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
    border-color: #c7d2fe;
    color: inherit;
}

.site-icon-wrap {
    width: 40px;
    height: 40px;
    flex: 0 0 40px;
    border-radius: 10px;
    overflow: hidden;
    background: #f3f4f6;
    display: flex;
    align-items: center;
    justify-content: center;
}

.site-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
    display: block;
}

.site-letter {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    background: var(--letter-bg, var(--nav-primary));
}

.site-meta {
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.site-name {
    font-weight: 650;
    font-size: 0.95rem;
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.site-desc {
    color: var(--nav-muted);
    font-size: 0.78rem;
    margin-top: 0.15rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.home-footer {
    border-top: 1px solid var(--nav-border);
    padding: 1.25rem 0 2rem;
    color: var(--nav-muted);
    font-size: 0.85rem;
    background: #fff;
}

.home-footer a {
    color: var(--nav-muted);
    text-decoration: none;
}

.home-footer a:hover { color: var(--nav-primary); }

.empty-state .btn-primary,
.btn-primary {
    background: var(--nav-primary);
    border-color: var(--nav-primary);
}

@media (max-width: 767.98px) {
    .home-nav .container {
        flex-wrap: wrap;
    }
    .search-box {
        max-width: none;
        flex-basis: 100%;
    }
    .cat-pills-wrap {
        top: 104px;
    }
}