@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&display=swap');

:root { --primary-blue: #1e3a8a; --secondary-blue: #3b82f6; --text-dark: #1f2937; --text-light: #4b5563; --bg-color: #f8fafc; --white: #ffffff; }
body { font-family: 'Inter', sans-serif; background-color: var(--bg-color); color: var(--text-dark); margin: 0; padding: 0; line-height: 1.7; }
header { background-color: var(--white); box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05); position: sticky; top: 0; z-index: 100; }
.nav-container { max-width: 1100px; margin: 0 auto; padding: 1rem 2rem; display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--primary-blue); text-decoration: none; letter-spacing: -0.5px; }
nav a { color: var(--text-light); text-decoration: none; margin-left: 2rem; font-weight: 600; font-size: 0.95rem; transition: color 0.2s; }
nav a:hover { color: var(--secondary-blue); }
.hero { text-align: center; padding: 4rem 2rem; background: linear-gradient(180deg, #eff6ff 0%, var(--bg-color) 100%); }
.hero h1 { font-size: 3rem; font-weight: 800; color: var(--primary-blue); margin-bottom: 1rem; line-height: 1.2; letter-spacing: -1px; }
.hero p { font-size: 1.2rem; color: var(--text-light); max-width: 600px; margin: 0 auto; }
.container { max-width: 1100px; margin: 0 auto; padding: 2rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; margin-top: 2rem; }
.card { background: var(--white); border-radius: 12px; padding: 2rem; box-shadow: 0 4px 6px rgba(0,0,0,0.02); border: 1px solid #e2e8f0; transition: transform 0.3s ease, box-shadow 0.3s ease; display: flex; flex-direction: column; }
.card:hover { transform: translateY(-5px); box-shadow: 0 12px 20px rgba(0,0,0,0.08); }
.card h3 { font-size: 1.3rem; margin-top: 0; margin-bottom: 1rem; }
.card p { color: var(--text-light); font-size: 0.95rem; flex-grow: 1; }
.card-link { display: inline-block; margin-top: 1.5rem; color: var(--secondary-blue); font-weight: 600; text-decoration: none; font-size: 0.95rem; }
.card-link:hover { text-decoration: underline; }
.article-content { max-width: 750px; margin: 0 auto; background: var(--white); padding: 3rem; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.02); }
.article-content h1 { font-size: 2.5rem; color: var(--primary-blue); line-height: 1.2; margin-bottom: 2rem; }
.article-content h2 { font-size: 1.8rem; color: var(--text-dark); margin-top: 2.5rem; border-bottom: 2px solid #eff6ff; padding-bottom: 0.5rem; }
.article-content ul, .article-content ol { padding-left: 1.5rem; margin-bottom: 1.5rem; }
.article-content li { margin-bottom: 0.5rem; }
.ad-container { background-color: #f1f5f9; border: 2px dashed #cbd5e1; border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #94a3b8; font-size: 0.85rem; font-weight: 600; margin: 2.5rem 0; text-transform: uppercase; letter-spacing: 1px; }
.ad-leaderboard { width: 100%; height: 90px; }
.ad-rectangle { width: 100%; max-width: 336px; height: 280px; margin: 2rem auto; }
footer { background-color: var(--text-dark); color: #9ca3af; text-align: center; padding: 3rem 2rem; margin-top: 4rem; }
footer a { color: #9ca3af; text-decoration: none; margin: 0 1rem; font-size: 0.9rem; }
footer a:hover { color: var(--white); }
@media (max-width: 768px) { .nav-container { flex-direction: column; gap: 1rem; } nav a { margin: 0 1rem; } .hero h1 { font-size: 2.2rem; } .article-content { padding: 1.5rem; } }