/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Base styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #242424;
    background: #ffffff;
    font-size: 16px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* Container */
.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
header {
    background: #ffffff;
    border-bottom: 1px solid #f2f2f2;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
    min-height: 60px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-abbreviation {
    width: 32px;
    height: 32px;
    background: #3498db;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 12px;
}

.brand-name {
    font-size: 16px;
    font-weight: 600;
    color: #242424;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: #6b6b6b;
    font-size: 14px;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #242424;
}

.youtube-link {
    color: #ff0000 !important;
    font-weight: 500;
}

/* Dropdown */
.nav-dropdown {
    position: relative;
}

.dropdown-toggle {
    color: #6b6b6b;
    font-size: 14px;
    cursor: pointer;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 220px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    border: 1px solid #e6e6e6;
    padding: 8px 0;
    z-index: 1001;
}

.nav-dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 8px 16px;
    color: #242424;
    font-size: 14px;
}

.dropdown-menu a:hover {
    background-color: #f8f9fa;
}

/* Hero section */
.hero {
    padding: 80px 0 20px;
    min-height: 30vh;
}

.hero-content {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 20px;
}

.author-intro {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.author-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center top;
    flex-shrink: 0;
}

.author-info h1 {
    font-size: 42px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 12px;
}

.author-info p {
    font-size: 20px;
    color: #6b6b6b;
    margin-bottom: 20px;
}

/* Social media buttons */
.action-buttons {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    align-items: center;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border-radius: 6px;
    border: 1px solid #e6e6e6;
    background: white;
    color: #242424;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background: #f8f9fa;
    transform: translateY(-1px);
}

/* Content sections */
.content-section {
    padding: 20px 0 40px 0;
}

.content-header {
    margin-bottom: 32px;
    border-bottom: 1px solid #f2f2f2;
    padding-bottom: 16px;
}

.content-header h2 {
    font-size: 16px;
    color: #6b6b6b;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Article cards */
.article-card {
    border-bottom: 1px solid #f2f2f2;
    padding: 32px 0;
}

.article-card:last-child {
    border-bottom: none;
}

.article-category {
    display: inline-block;
    background: #f0f8ff;
    color: #3498db;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 8px;
}

.article-content h3 a {
    color: #242424;
    font-size: 22px;
    font-weight: 700;
    line-height: 1.3;
}

.article-content h3 a:hover {
    color: #1a8917;
}

.article-excerpt {
    color: #6b6b6b;
    font-size: 16px;
    margin-bottom: 12px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: #6b6b6b;
    flex-wrap: wrap;
}

.article-meta .author {
    font-weight: 500;
    color: #242424;
}

.article-meta .author::after,
.article-meta .date::after {
    content: '·';
    margin: 0 4px;
}

/* About section */
.about-section {
    padding: 48px 0;
    background: #f9f9f9;
}

.about-section h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
}

.about-section p {
    font-size: 16px;
    color: #6b6b6b;
    max-width: 600px;
}

/* Footer */
footer {
    background: #ffffff;
    border-top: 1px solid #f2f2f2;
    padding: 48px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 32px;
    gap: 24px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #242424;
}

.footer-section p {
    color: #6b6b6b;
    font-size: 14px;
}

.footer-section a {
    color: #6b6b6b;
    font-size: 14px;
    display: block;
    margin-bottom: 8px;
}

.footer-section a:hover {
    color: #242424;
}

.footer-bottom {
    text-align: center;
    padding-top: 16px;
    border-top: 1px solid #f2f2f2;
}

.footer-bottom p {
    color: #6b6b6b;
    font-size: 12px;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .navbar {
        padding: 12px 16px;
        flex-wrap: wrap;
    }
    
    .nav-links {
        gap: 12px;
        flex-wrap: wrap;
    }
    
    .nav-links a {
        font-size: 13px;
    }
    
    .dropdown-menu {
        min-width: 200px;
        left: -50px;
    }
    
    .hero {
        padding: 70px 0 20px;
        min-height: 40vh;
    }
    
    .author-intro {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }
    
    .author-avatar {
        width: 70px;
        height: 70px;
        align-self: center;
    }
    
    .author-info h1 {
        font-size: 28px;
    }
    
    .author-info p {
        font-size: 16px;
    }
    
    .action-buttons {
        justify-content: center;
        gap: 8px;
    }
    
    .container {
        padding: 0 16px;
    }
    
    .content-section {
        padding: 15px 0 30px 0;
    }
    
    .article-card {
        padding: 24px 0;
    }
    
    .article-content h3 a {
        font-size: 20px;
        line-height: 1.2;
    }
    
    .article-excerpt {
        font-size: 15px;
        line-height: 1.4;
    }
    
    .about-section {
        padding: 30px 0;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .footer-section a {
        margin-bottom: 6px;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 10px 12px;
    }
    
    .brand-abbreviation {
        width: 28px;
        height: 28px;
        font-size: 11px;
    }
    
    .brand-name {
        font-size: 14px;
    }
    
    .nav-links a {
        font-size: 12px;
    }
    
    .dropdown-menu {
        min-width: 180px;
        left: -80px;
        font-size: 13px;
    }
    
    .hero {
        padding: 60px 0 15px;
    }
    
    .author-info h1 {
        font-size: 24px;
        line-height: 1.1;
    }
    
    .author-info p {
        font-size: 14px;
        line-height: 1.3;
    }
    
    .author-avatar {
        width: 60px;
        height: 60px;
    }
    
    .action-btn {
        padding: 6px;
    }
    
    .container {
        padding: 0 12px;
    }
    
    .content-header h2 {
        font-size: 14px;
    }
    
    .article-content h3 a {
        font-size: 18px;
    }
    
    .article-excerpt {
        font-size: 14px;
    }
    
    .article-meta {
        font-size: 12px;
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
    
    .about-section h2 {
        font-size: 18px;
    }
    
    .about-section p {
        font-size: 15px;
        line-height: 1.5;
    }
    
    .footer-section h4 {
        font-size: 14px;
    }
    
    .footer-section p,
    .footer-section a {
        font-size: 13px;
    }
}