/* Modern Neutral Design System */
:root {
    --color-primary: #2c2c2c;
    --color-secondary: #4a4a4a;
    --color-tertiary: #6b6b6b;
    --color-accent: #8b8b8b;
    --color-light: #f5f5f5;
    --color-white: #ffffff;
    --color-border: #e0e0e0;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    --font-size-xs: 0.875rem;
    --font-size-sm: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.5rem;
    --font-size-xl: 2rem;
    --font-size-xxl: 3rem;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-sm);
    line-height: 1.7;
    color: var(--color-secondary);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.nav-brand {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    text-decoration: none;
    color: var(--color-tertiary);
    font-size: var(--font-size-xs);
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-primary);
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--color-primary);
}

.nav-menu a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-light) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.hero-image-container {
    position: relative;
}

.hero-image {
    width: 100%;
    height: auto;
    border-radius: 4px;
    display: block;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.hero-text h1 {
    font-size: var(--font-size-xxl);
    font-weight: 300;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -1px;
}

.hero-text .title {
    font-size: var(--font-size-md);
    color: var(--color-tertiary);
    font-weight: 400;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-white);
    border-radius: 4px;
    border-left: 2px solid var(--color-primary);
}

.hero-description .question {
    font-size: var(--font-size-lg);
    font-weight: 300;
    color: var(--color-primary);
    font-style: italic;
    margin-bottom: var(--spacing-sm);
}

.hero-description p {
    font-size: var(--font-size-sm);
    line-height: 1.8;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.hero-description p:last-child {
    margin-bottom: 0;
}

/* Section Headers */
.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 300;
    color: var(--color-primary);
    letter-spacing: -0.5px;
    margin-bottom: var(--spacing-sm);
}

.divider {
    width: 60px;
    height: 2px;
    background: var(--color-primary);
}

/* About Section */
.about {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.about-content {
    max-width: 800px;
    margin-bottom: var(--spacing-lg);
}

.about-content p {
    font-size: var(--font-size-md);
    line-height: 1.8;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.expertise-item {
    padding: var(--spacing-md);
    background: var(--color-light);
    border-radius: 4px;
    border-left: 2px solid var(--color-primary);
    transition: var(--transition);
}

.expertise-item:hover {
    transform: translateX(4px);
    background: var(--color-white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.expertise-item h3 {
    font-size: var(--font-size-md);
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.expertise-item p {
    font-size: var(--font-size-xs);
    color: var(--color-tertiary);
    margin: 0;
}

/* Articles Section */
.articles {
    padding: var(--spacing-xl) 0;
    background: var(--color-light);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.article-card {
    background: var(--color-white);
    border-radius: 4px;
    padding: var(--spacing-md);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    border-color: var(--color-primary);
}

.article-date {
    font-size: var(--font-size-xs);
    color: var(--color-accent);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
}

.article-card h3 {
    font-size: var(--font-size-md);
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.article-card p {
    font-size: var(--font-size-xs);
    color: var(--color-tertiary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.article-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-primary);
    text-decoration: none;
    font-size: var(--font-size-xs);
    font-weight: 500;
    transition: var(--transition);
}

.article-link:hover {
    gap: 12px;
}

.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--color-accent);
    font-style: italic;
}

/* Footer */
.footer {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-white);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
}

.footer-link:hover {
    background: rgba(255, 255, 255, 0.1);
}

.footer-link svg {
    width: 20px;
    height: 20px;
}

.copyright {
    font-size: var(--font-size-xs);
    color: var(--color-accent);
    margin: 0;
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .hero-image-container {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .hero-text {
        text-align: center;
    }
    
    .hero-description {
        text-align: left;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-xxl: 2rem;
        --font-size-xl: 1.5rem;
        --spacing-xl: 3rem;
    }
    
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .expertise-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-menu {
        width: 100%;
        justify-content: space-around;
    }
    
    .hero {
        margin-top: 120px;
    }
}