/* --- 1. GENERAL RESET --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f9;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

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

html {
    scroll-behavior: smooth;
}

/* --- 2. HEADER --- */
header {
    background-color: #2c3e50;
    color: #fff;
    padding: 0 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 70px;
}

.logo a {
    font-size: 1.8rem;
    font-weight: bold;
    letter-spacing: 1px;
    color: #ecf0f1;
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 25px;
    margin: 0;
    padding: 0;
}

nav a {
    color: #ecf0f1;
    font-weight: 500;
    transition: color 0.3s;
    text-decoration: none;
    font-size: 0.95rem;
}

nav a:hover {
    color: #3498db;
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    align-items: center;
}

.lang-btn {
    background-color: #3498db;
    color: white !important;
    padding: 7px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background-color: #2980b9;
    transform: translateY(-1px);
}

/* --- 3. FOOTER --- */
footer {
    background-color: #222;
    color: #aaa;
    padding: 40px 20px;
    text-align: center;
    margin-top: auto;
}

.footer-nav {
    margin-bottom: 20px;
}

.footer-nav a {
    margin: 0 15px;
    font-size: 0.9rem;
}

.footer-nav a:hover {
    color: white;
}

.copyright {
    font-size: 0.8rem;
    border-top: 1px solid #444;
    padding-top: 20px;
    margin-top: 20px;
}

/* --- 4. HOMEPAGE & LAYOUT --- */
.hero {
    background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
    color: white;
    text-align: center;
    padding: 80px 20px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 10px;
}

.hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.9;
}

.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
    flex: 1;
}

.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.card-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card h3 {
    margin-bottom: 10px;
    color: #2c3e50;
    font-size: 1.3rem;
}

/* --- 5. BUTTONS --- */
.button-group {
    display: flex;
    gap: 10px;
    margin-top: auto;
}

.btn {
    flex: 1;
    padding: 10px;
    border-radius: 5px;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 500;
}

.btn-read {
    background-color: #3498db;
    color: white;
}

.btn-share {
    background-color: #25D366;
    color: white;
}

/* --- 6. ARTICLE PAGE LAYOUT --- */
.page-wrapper {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.sidebar {
    flex: 0 0 250px;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: sticky;
    top: 100px;
}

.sidebar h3 {
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 15px;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

.sidebar ul {
    list-style: none;
}

.sidebar li {
    margin-bottom: 12px;
}

.sidebar a {
    color: #555;
    font-size: 0.95rem;
    transition: color 0.2s;
    display: block;
}

.sidebar a:hover {
    color: #3498db;
    padding-left: 5px;
    font-weight: 600;
}

.article-content {
    flex: 1;
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    min-width: 0;
}

.article-content h1 {
    color: #2c3e50;
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.subtitle {
    color: #7f8c8d;
    font-size: 1.1rem;
    margin-bottom: 30px;
    border-bottom: 2px solid #3498db;
    padding-bottom: 20px;
}

/* --- 7. ELEMENTS (Images, Code, Lists) --- */
figure {
    margin: 30px 0;
    text-align: center;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

figcaption {
    font-size: 0.9rem;
    color: #7f8c8d;
    margin-top: 10px;
    font-style: italic;
}

pre {
    background-color: #2d3436;
    color: #dfe6e9;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
}

h2 {
    scroll-margin-top: 100px;
    color: #2c3e50;
    margin-top: 40px;
    margin-bottom: 15px;
    border-left: 5px solid #3498db;
    padding-left: 15px;
}

/* --- 8. MOBILE --- */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        height: auto;
        padding: 15px 5%;
        gap: 12px;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .lang-switcher {
        margin-top: 5px;
    }

    .page-wrapper {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: relative;
        top: 0;
        margin-bottom: 20px;
    }

    .article-content {
        padding: 20px;
    }
}