* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.1);
    --accent-start: #667eea;
    --accent-end: #764ba2;
}

body.light-mode {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --card-bg: #ffffff;
    --card-border: #e0e0e0;
}

html, body {
    width: 100%;
    overflow-x: hidden;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: hidden;
    background: var(--bg-primary);
    transition: background 0.3s ease, color 0.3s ease;
}
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

body.light-mode .header {
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid #e0e0e0;
}

.header-container {
    margin: 0 auto;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-menu { display: flex; gap: 15px; align-items: center; }
.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    cursor: pointer;
}

.nav-link:hover {
    color: var(--accent-start);
}

.theme-toggle {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 30px;
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
    color: var(--text-primary);
}

.theme-toggle:hover {
    border-color: var(--accent-start);
    transform: scale(1.05);
}

.theme-icon {
    width: 20px;
    height: 20px;
}

.footer {
    padding: 40px 20px;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--card-border);
    margin-top: 80px;
}

.footer-container {
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.footer-logo {
    font-size: 1.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    cursor: pointer;
}

.footer-link:hover {
    color: var(--accent-start);
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .article-hero h1 {
        font-size: 2.2rem;
    }

    .article-content h2 {
        font-size: 1.8rem;
    }

    .article-content p {
        font-size: 1.05rem;
    }

    .article-meta {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
}

@media (max-width: 600px) {
    .nav-link:nth-child(1),
    .nav-link:nth-child(2) {
        display: none;
    }
}

@media (max-width: 480px) {
    .footer-container {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }

    .footer-links {
        gap: 15px;
    }

    .footer-copyright {
        display: none;
    }
}