@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    font-weight: 400;
    letter-spacing: -0.011em;
    line-height: 1.65;
    color: #333;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    z-index: 100;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.nav.scrolled {
    padding: 0.75rem 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: #22388a;
    text-decoration: none;
    transition: color 0.3s ease;
}

.logo-text:hover {
    color: #4FA0DE;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: #22388a;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    letter-spacing: 0.01em;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #22388a;
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: #4FA0DE;
}

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

/* Article Header */
.article-header {
    background: #22388a;
    color: white;
    padding: 8rem 2rem 4rem;
    text-align: center;
    border-bottom: 3px solid #4FA0DE;
}

.article-header h1 {
    font-size: 3rem;
    font-weight: 600;
    letter-spacing: -0.025em;
    line-height: 1.15;
    margin-bottom: 1rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.article-meta {
    font-size: 1rem;
    opacity: 0.9;
    margin-top: 1.5rem;
}

/* Article Content */
.article-content {
    max-width: 800px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.article-content p {
    margin-bottom: 1.5rem;
    font-size: 1.0625rem;
    font-weight: 400;
    letter-spacing: -0.006em;
    line-height: 1.8;
    color: #444;
}

.article-content h2 {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.25;
    color: #22388a;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.article-content h3 {
    font-size: 1.375rem;
    font-weight: 600;
    letter-spacing: -0.015em;
    line-height: 1.35;
    color: #22388a;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.article-content ul, .article-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.article-content li {
    margin-bottom: 0.5rem;
    font-size: 1.0625rem;
    line-height: 1.8;
}

.placeholder-notice {
    background: #fff3cd;
    border: 2px solid #ffc107;
    border-radius: 8px;
    padding: 2rem;
    margin: 3rem 0;
    text-align: center;
}

.placeholder-notice h3 {
    color: #856404;
    margin-bottom: 1rem;
}

.placeholder-notice p {
    color: #856404;
    margin-bottom: 0;
}

/* Featured Image */
.featured-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 2rem 0 3rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Back Link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #22388a;
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 2rem;
    transition: gap 0.3s ease;
}

.back-link:hover {
    gap: 1rem;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 3rem 2rem 2rem;
    text-align: center;
    margin-top: 6rem;
}

.footer p {
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .article-header h1 {
        font-size: 2rem;
    }

    .article-content {
        padding: 0 1rem;
    }

    .nav-links {
        gap: 1rem;
    }
}