* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
    height: 100%;
}

body {
    font-family: 'Tahoma', 'Segoe UI', sans-serif;
    background: #F1F5F9;
    color: #0F172A;
    line-height: 1.8;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container { max-width: 1400px; margin: 0 auto; padding: 30px 20px; width: 100%; }

header {
    background: #0F172A;
    color: #fff;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header a { color: #fff; text-decoration: none; }
header .logo { font-size: 22px; font-weight: bold; }

nav a {
    margin-inline-start: 20px;
    color: #F1F5F9;
    font-size: 15px;
    text-decoration: none;
}
nav a:hover { color: #1D4ED8; }

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    padding: 4px 8px;
}

@media (max-width: 640px) {
    .menu-toggle {
        display: block;
    }

    nav#main-nav {
        display: none;
        position: absolute;
        top: 100%;
        right: 0;
        left: 0;
        background: #0F172A;
        flex-direction: column;
        padding: 10px 0;
    }

    nav#main-nav.open {
        display: flex;
    }

    nav#main-nav a {
        padding: 12px 40px;
        margin: 0;
    }

    header {
        position: relative;
    }
}

.container { max-width: 1100px; margin: 0 auto; padding: 30px 20px; }

#articles, #results {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.article-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
}

.article-card img { width: 100%; max-height: 220px; object-fit: cover; display: block; }
.article-card .content { padding: 20px; }
.article-card h2 { font-size: 20px; margin-bottom: 8px; }
.article-card h2 a { color: #0F172A; text-decoration: none; }
.article-card h2 a:hover { color: #1D4ED8; }
.article-card .meta { color: #64748B; font-size: 13px; margin-bottom: 10px; }
.article-card p { color: #334155; font-size: 15px; }

.category-tag {
    display: inline-block;
    background: #1D4ED8;
    color: #fff;
    font-size: 12px;
    padding: 3px 10px;
    border-radius: 4px;
    margin-bottom: 8px;
}

footer {
    text-align: center;
    padding: 30px;
    color: #64748B;
    font-size: 14px;
    margin-top: auto;
}

.loading, .empty { text-align: center; padding: 40px; color: #64748B; }

.article-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid #E2E8F0;
}

.article-nav a {
    flex: 1;
    background: #fff;
    padding: 14px 18px;
    border-radius: 8px;
    text-decoration: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.article-nav .nav-next { text-align: left; }

.nav-label {
    font-size: 12px;
    color: #64748B;
}

.nav-title {
    font-size: 14px;
    color: #0F172A;
    font-weight: 500;
}

.article-nav a:hover .nav-title { color: #1D4ED8; }

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.category-grid-item {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    text-decoration: none;
    color: #0F172A;
    font-weight: 500;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.category-grid-item:hover {
    color: #1D4ED8;
}

.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
}
.search-box input {
    flex: 1;
    padding: 12px;
    border: 1px solid #CBD5E1;
    border-radius: 6px;
    font-size: 15px;
}
.search-box button {
    padding: 12px 20px;
    background: #1D4ED8;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    cursor: pointer;
}