.home-hero {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.85) 0%, rgba(249, 250, 250, 0) 100%);
    padding: var(--su32) var(--su16);
    margin-bottom: var(--su8);
    overflow: hidden;
}

.home-hero h1 {
    color: var(--bs-dark);
    font-weight: 700;
    font-size: calc(var(--fs-headline1) + 0.5rem);
}

.home-hero .lead {
    color: var(--bs-secondary);
    max-width: 700px;
    margin: 0 auto var(--su24) auto;
    font-size: var(--fs-body2);
}

.hero-search-box {
    max-width: 600px;
    margin: 0 auto;
}

.hero-search-form {
    display: flex;
    align-items: center;
    gap: var(--su8);
    padding: var(--su6);
    border: 1px solid var(--bs-border-color);
    background: var(--so-white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.hero-search-form:focus-within {
    border-color: var(--brand-orange);
    box-shadow: 0 4px 16px rgba(231, 112, 13, 0.18);
}

.hero-search-form .hero-search-input {
    flex: 1;
    height: 44px;
    padding-left: var(--su12);
    border: 0;
    box-shadow: none;
    font-size: var(--fs-body2);
}

.hero-search-form .hero-search-input:focus {
    outline: none;
    box-shadow: none;
}

.section-title {
    font-size: var(--fs-body3);
    font-weight: 700;
    margin-bottom: var(--su24);
    padding-left: var(--su12);
    border-left: 4px solid var(--bs-dark);
    line-height: 1.2;
}

.tool-card {
    border: 1px solid var(--bs-border-color);
    background: var(--so-white);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    height: 100%;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    border-color: transparent;
}

.tool-card .card-body {
    padding: var(--su24);
    flex: 1;
}

.tool-card .tool-header {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--su16);
}

.tool-card .tool-icon-wrapper {
    width: 56px;
    height: 56px;
    background: var(--bs-gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--su16);
    flex-shrink: 0;
}

.tool-card .tool-icon {
    object-fit: contain;
}

.tool-card .tool-info {
    flex: 1;
}

.tool-card .tool-category {
    font-size: var(--fs-caption);
    text-transform: uppercase;
    color: var(--bs-secondary);
    font-weight: 700;
    letter-spacing: 0.4px;
    margin-bottom: var(--su4);
    display: block;
}

.tool-card .card-title {
    font-size: var(--fs-body2);
    font-weight: 700;
    margin: 0;
    line-height: 1.4;
}

.tool-card .card-title a {
    color: var(--bs-dark);
    text-decoration: none;
    transition: color 0.2s ease;
}

.tool-card:hover .card-title a {
    color: var(--bs-link-hover-color);
}

.tool-card .card-text {
    color: var(--bs-secondary);
    font-size: var(--fs-body1);
    line-height: 1.6;
    margin-bottom: 0;
}

.tool-card .card-actions {
    padding: var(--su12) var(--su24);
    background: var(--bs-gray-100);
    border-top: 1px solid var(--bs-gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.tool-card .card-link-text {
    font-size: var(--fs-caption);
    color: var(--bs-secondary);
}

.tool-card .btn-enter {
    color: var(--brand-orange);
    font-weight: 600;
    font-size: var(--fs-body1);
    display: inline-flex;
    align-items: center;
}

.tool-card:hover .btn-enter {
    color: var(--brand-orange-hover);
}

.stretched-link::after {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1;
    content: "";
}

.home-ads {
    margin-top: var(--su8);
    margin-bottom: var(--su24);
}

.home-ads .home-ad-img {
    display: block;
    width: 100%;
    max-width: 100%;
    aspect-ratio: 360 / 112;
    object-fit: cover;
    margin: 0 auto;
}

.home-ads .home-ad-meta {
    margin-top: var(--su8);
}

.home-ads .home-ad-badge {
    background: var(--bs-gray-100);
    font-weight: 400;
}

@media (max-width: 576px) {
    .home-hero {
        padding: var(--su24) var(--su16);
    }

    .hero-search-form {
        flex-direction: column;
        align-items: stretch;
        padding: var(--su8);
    }

    .hero-search-form .hero-search-input {
        width: 100%;
    }

    .hero-search-form .btn-search {
        width: 100%;
    }

    .home-ads .home-ad-img {
        max-width: none;
    }
}

/* ===== Home Feed 类型徽章 ===== */
.home-feed-badge {
    display: inline-flex;
    align-items: center;
    font-size: var(--fs-caption);
    font-weight: 600;
    padding: 0 var(--su6);
    border-radius: var(--br-sm);
    white-space: nowrap;
    line-height: 1.5;
}

.home-feed-badge--article {
    background: var(--so-black-200);
    color: var(--so-black-600);
}

.home-feed-badge--guilei {
    background: var(--so-orange-100);
    color: var(--so-orange-600);
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 首页 Feed 列表：SO 风格外卡包裹 ===== */
.home-feed-card {
    border: 1px solid var(--so-black-225);
    background-color: var(--so-white);
    border-radius: var(--br-sm);
    padding: 0;
}

.home-feed-card .gl-summary {
    background: transparent;
    padding-left: var(--su12);
}

.home-feed-card .gl-summary:last-child {
    border-bottom: none;
}

/* 右栏广告卡片 */
.home-ad-card {
    padding: var(--su8) 0;
    border-bottom: 1px solid var(--so-black-100);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.home-ad-card:last-child {
    border-bottom: none;
}

.home-ad-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.home-ad-card .home-ad-img {
    border-radius: var(--br-sm, 4px);
    max-width: 100%;
    height: auto;
    aspect-ratio: 360 / 112;
    object-fit: cover;
}

.input-group .input-group-text {
    font-size: var(--fs-caption);
    font-weight: 700;
}