* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f5f7fa;
    color: #222;
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(1180px, calc(100% - 30px));
    margin: auto;
}

.site-header {
    background: #ffffff;
    border-bottom: 1px solid #ddd;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    font-size: 25px;
    font-weight: 800;
}

.main-nav {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

.main-nav a {
    font-size: 14px;
    font-weight: 600;
}

.main-nav a:hover {
    text-decoration: underline;
}

.hero {
    margin: 30px 0;
    padding: 45px 30px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 10px;
    text-align: center;
}

.hero h1 {
    margin-top: 0;
    font-size: clamp(28px, 5vw, 44px);
}

.search-box {
    display: flex;
    max-width: 700px;
    margin: 25px auto 0;
}

.search-box input {
    flex: 1;
    min-width: 0;
    padding: 14px;
    border: 1px solid #bbb;
    font-size: 16px;
}

.search-box button {
    padding: 14px 25px;
    border: 0;
    cursor: pointer;
    font-weight: 700;
}

.content-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 25px;
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.section-heading h2 {
    margin: 0;
}

.post-list {
    display: grid;
    gap: 15px;
}

.post-card {
    display: flex;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
}

.post-card img {
    width: 190px;
    object-fit: cover;
}

.post-card-body {
    padding: 18px;
}

.post-card h3 {
    margin: 7px 0;
}

.post-card p {
    margin: 5px 0;
    color: #666;
}

.category-label {
    font-size: 12px;
    font-weight: 700;
}

.sidebar-box {
    background: #fff;
    border: 1px solid #ddd;
    padding: 20px;
    border-radius: 8px;
}

.sidebar-box ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-box li {
    padding: 9px 0;
    border-bottom: 1px solid #eee;
}

.ad-box {
    margin-top: 20px;
    min-height: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #eee;
    color: #777;
}

.empty {
    background: #fff;
    padding: 30px;
    border: 1px solid #ddd;
}

.site-footer {
    margin-top: 50px;
    padding: 30px 0;
    background: #222;
    color: #fff;
}

@media (max-width: 800px) {

    .header-inner {
        flex-direction: column;
        padding: 15px 0;
    }

    .main-nav {
        justify-content: center;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .post-card {
        display: block;
    }

    .post-card img {
        width: 100%;
        max-height: 220px;
    }

    .search-box {
        flex-direction: column;
    }

    .search-box button {
        width: 100%;
    }
}