.delang-yewu-page { background: #f7f8fa; }

.yewu-wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.yewu-hero {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    padding: 80px 0 60px;
    color: #fff;
}
.yewu-hero-inner { text-align: center; }
.yewu-hero-title span {
    display: block;
    font-size: 14px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: rgba(255,255,255,.5);
    margin-bottom: 12px;
}
.yewu-hero-title h1 {
    font-size: 36px;
    font-weight: 700;
    margin: 0 0 10px;
    letter-spacing: 2px;
    color: #fff;
    text-shadow: 0 2px 8px rgba(0,0,0,.35);
}
.yewu-hero-title p {
    font-size: 14px;
    color: rgba(255,255,255,.6);
    margin: 0;
}

.yewu-layout {
    display: flex;
    gap: 30px;
    padding-top: 40px;
    padding-bottom: 60px;
    align-items: flex-start;
}

.yewu-sidebar {
    width: 240px;
    flex-shrink: 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(0,0,0,.06);
    padding: 24px 0;
    position: sticky;
    top: 80px;
}
.yewu-sidebar-title {
    font-size: 18px;
    font-weight: 700;
    padding: 0 24px 16px;
    margin: 0;
    border-bottom: 1px solid #eee;
    color: #1a1a2e;
}
.yewu-sidebar-list {
    list-style: none;
    margin: 0;
    padding: 8px 0 0;
}
.yewu-sidebar-item a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    color: #555;
    text-decoration: none;
    font-size: 15px;
    transition: all .2s;
    border-left: 3px solid transparent;
}
.yewu-sidebar-item a:hover {
    background: #f5f6fa;
    color: #0f3460;
}
.yewu-sidebar-item.is-active a {
    background: #f0f4ff;
    color: #0f3460;
    font-weight: 600;
    border-left-color: #0f3460;
}
.yewu-sidebar-arrow {
    font-size: 13px;
    opacity: 0;
    transform: translateX(-4px);
    transition: all .2s;
}
.yewu-sidebar-item.is-active .yewu-sidebar-arrow,
.yewu-sidebar-item:hover .yewu-sidebar-arrow {
    opacity: 1;
    transform: translateX(0);
}

.yewu-main {
    flex: 1;
    min-width: 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(0,0,0,.06);
    padding: 36px 40px;
}
.yewu-cover {
    margin-bottom: 28px;
    text-align: center;
}
.yewu-cover img {
    max-width: 100%;
    max-height: 320px;
    border-radius: 6px;
    object-fit: cover;
}
.yewu-richtext {
    font-size: 16px;
    line-height: 2;
    color: #333;
}
.yewu-richtext p {
    margin-bottom: 12px;
    text-align: justify;
}
.yewu-richtext img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}
.yewu-empty {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}
.yewu-empty h3 {
    font-size: 20px;
    margin-bottom: 8px;
    color: #666;
}

@media (max-width: 768px) {
    .yewu-hero { padding: 50px 0 40px; }
    .yewu-hero-title h1 { font-size: 26px; }
    .yewu-layout {
        flex-direction: column;
        gap: 20px;
        padding-top: 20px;
        padding-bottom: 40px;
    }
    .yewu-sidebar {
        width: 100%;
        position: static;
        padding: 16px 0;
    }
    .yewu-sidebar-list {
        display: flex;
        flex-wrap: wrap;
        padding: 8px 12px 0;
    }
    .yewu-sidebar-item a {
        padding: 8px 14px;
        font-size: 14px;
        border-left: none;
        border-bottom: 2px solid transparent;
    }
    .yewu-sidebar-item.is-active a {
        border-left-color: transparent;
        border-bottom-color: #0f3460;
    }
    .yewu-sidebar-arrow { display: none; }
    .yewu-main { padding: 24px 20px; }
}