<style>
:root {
    --bg-color: #f4f4f9;
    --text-color: #333;
    --card-bg-color: #fff;
    --header-bg-color: #fff;
    --shadow-color: rgba(0,0,0,0.1);
    --link-color: #0056b3;
    --link-hover-color: #004494;
    --border-color: #ddd;
    --footer-bg-color: #333;
    --footer-text-color: #fff;
}

.dark-mode {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --card-bg-color: #1e1e1e;
    --header-bg-color: #1e1e1e;
    --shadow-color: rgba(0,0,0,0.4);
    --link-color: #4dabf7;
    --link-hover-color: #74c0fc;
    --border-color: #444;
    --footer-bg-color: #1e1e1e;
    --footer-text-color: #e0e0e0;
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

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

header {
    background: var(--header-bg-color);
    box-shadow: 0 2px 5px var(--shadow-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s;
}
header .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 700; color: var(--link-color); text-decoration: none; z-index: 10; }

/* Desktop Navigation */
nav ul { list-style: none; margin: 0; padding: 0; display: flex; }
nav ul li { margin-left: 20px; }
nav ul li a { text-decoration: none; color: var(--text-color); font-weight: 500; transition: color 0.3s ease; }
nav ul li a:hover { color: var(--link-color); }

.header-right { display: flex; align-items: center; gap: 1rem; }
.search-bar input { border: 1px solid var(--border-color); background-color: var(--bg-color); color: var(--text-color); border-radius: 20px; padding: 8px 15px; transition: background-color 0.3s, border-color 0.3s; }

.theme-toggle-btn { background: none; border: none; cursor: pointer; padding: 5px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--text-color); }
.theme-toggle-btn:hover { background-color: rgba(128, 128, 128, 0.2); }
.moon-icon { display: none; }
.dark-mode .sun-icon { display: none; }
.dark-mode .moon-icon { display: block; }

/* Hamburger Menu (Hidden on Desktop) */
.hamburger { display: none; }

main { padding: 2rem 0; }
h2 { font-size: 2rem; color: var(--text-color); margin-bottom: 1.5rem; text-align: center; }
.posts-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 25px; }
.post-card { background: var(--card-bg-color); border-radius: 8px; box-shadow: 0 4px 8px var(--shadow-color); overflow: hidden; transition: transform 0.3s ease, background-color 0.3s, opacity 0.3s; }
.post-card:hover { transform: translateY(-5px); }
.post-card img { width: 100%; height: 200px; object-fit: cover; }
.post-card h3 { font-size: 1.2rem; margin: 15px; color: var(--text-color); }
.post-card p { font-size: 0.9rem; margin: 0 15px 15px; color: var(--text-color); opacity: 0.8; }
.read-more { display: inline-block; background: var(--link-color); color: #fff; padding: 8px 15px; margin: 0 15px 15px; border-radius: 5px; text-decoration: none; font-weight: 500; }
.read-more:hover { background: var(--link-hover-color); }

.no-results { text-align: center; margin-top: 3rem; padding: 2rem; background-color: var(--card-bg-color); border-radius: 8px; }

footer { background: var(--footer-bg-color); color: var(--footer-text-color); text-align: center; padding: 2rem 0; margin-top: 2rem; transition: background-color 0.3s, color 0.3s; }
.footer-links a { color: var(--footer-text-color); text-decoration: none; margin: 0 15px; }
.footer-links a:hover { text-decoration: underline; }
footer p { margin-top: 1rem; font-size: 0.9rem; }

/* =============================================================== */
/* RESPONSIVE STYLES FOR MOBILE & TABLET                           */
/* =============================================================== */
@media (max-width: 992px) {
    /* --- Mobile Navigation --- */
    nav {
        display: none; /* Hide nav by default */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--header-bg-color);
        box-shadow: 0 4px 8px var(--shadow-color);
    }
    nav.active {
        display: block; /* Show nav when active */
    }
    nav ul {
        flex-direction: column;
        padding: 1rem;
    }
    nav ul li {
        margin: 0;
        width: 100%;
    }
    nav ul li a {
        display: block;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
    }
    
    /* --- Hamburger Button --- */
    .hamburger {
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        width: 30px;
        height: 25px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 10;
    }
    .hamburger span {
        width: 30px;
        height: 3px;
        background-color: var(--text-color);
        border-radius: 5px;
        transition: all 0.3s linear;
    }
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    /* Hide desktop-only elements */
    .header-right .search-bar {
        display: none;
    }
}

@media (max-width: 768px) {
    .posts-grid {
        grid-template-columns: 1fr; /* Stack articles in a single column */
    }
    h2 {
        font-size: 1.8rem;
    }
}
</style>