* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', system-ui, sans-serif; color: #1a1a2e; background: #f8f9ff; line-height: 1.7; }
a { color: #4361ee; text-decoration: none; }
a:hover { text-decoration: underline; }

/* Nav */
nav { background: #1a1a2e; padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; height: 60px; position: sticky; top: 0; z-index: 100; }
nav .logo { color: #fff; font-size: 1.4rem; font-weight: 700; letter-spacing: -0.5px; }
nav .logo span { color: #4cc9f0; }
nav ul { list-style: none; display: flex; gap: 2rem; }
nav ul a { color: #ccd6f6; font-size: 0.9rem; transition: color 0.2s; }
nav ul a:hover { color: #fff; text-decoration: none; }

/* Hero */
.hero { background: linear-gradient(135deg, #1a1a2e 0%, #16213e 60%, #0f3460 100%); color: #fff; padding: 5rem 2rem; text-align: center; }
.hero h1 { font-size: 2.8rem; font-weight: 800; line-height: 1.2; max-width: 700px; margin: 0 auto 1.2rem; }
.hero h1 span { color: #4cc9f0; }
.hero p { font-size: 1.15rem; color: #ccd6f6; max-width: 560px; margin: 0 auto 2rem; }
.btn { display: inline-block; background: #4361ee; color: #fff; padding: 0.85rem 2rem; border-radius: 8px; font-weight: 600; font-size: 1rem; transition: background 0.2s, transform 0.1s; }
.btn:hover { background: #3a0ca3; text-decoration: none; transform: translateY(-1px); }
.btn-outline { background: transparent; border: 2px solid #4cc9f0; color: #4cc9f0; margin-left: 1rem; }
.btn-outline:hover { background: #4cc9f0; color: #1a1a2e; }

/* Container */
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

/* Sections */
section { padding: 4rem 0; }
section h2 { font-size: 2rem; font-weight: 700; margin-bottom: 0.5rem; }
section .subtitle { color: #666; margin-bottom: 2.5rem; font-size: 1.05rem; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.card { background: #fff; border-radius: 12px; padding: 1.8rem; box-shadow: 0 2px 15px rgba(0,0,0,0.06); transition: transform 0.2s, box-shadow 0.2s; border: 1px solid #eee; }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,0,0,0.1); }
.card .icon { font-size: 2rem; margin-bottom: 1rem; }
.card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.card p { color: #555; font-size: 0.95rem; }
.card a { display: inline-block; margin-top: 1rem; font-size: 0.9rem; font-weight: 600; }

/* Coinbase CTA */
.cta-coinbase { background: linear-gradient(135deg, #0052ff, #1a73e8); color: #fff; border-radius: 16px; padding: 3rem 2.5rem; text-align: center; }
.cta-coinbase h2 { color: #fff; font-size: 2rem; margin-bottom: 0.8rem; }
.cta-coinbase p { color: rgba(255,255,255,0.85); margin-bottom: 1.8rem; font-size: 1.05rem; }
.cta-coinbase .btn { background: #fff; color: #0052ff; font-weight: 700; }
.cta-coinbase .btn:hover { background: #e8f0fe; }

/* Articles */
.articles-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.article-card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 12px rgba(0,0,0,0.06); border: 1px solid #eee; transition: transform 0.2s; }
.article-card:hover { transform: translateY(-3px); }
.article-card .thumb { background: linear-gradient(135deg, #4361ee, #4cc9f0); height: 140px; display: flex; align-items: center; justify-content: center; font-size: 3rem; }
.article-card .content { padding: 1.4rem; }
.article-card .tag { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; color: #4361ee; margin-bottom: 0.4rem; }
.article-card h3 { font-size: 1rem; margin-bottom: 0.5rem; line-height: 1.4; }
.article-card p { font-size: 0.88rem; color: #666; }

/* Footer */
footer { background: #1a1a2e; color: #8892b0; text-align: center; padding: 2rem; font-size: 0.85rem; }
footer a { color: #4cc9f0; }

/* Article page */
.article-hero { background: linear-gradient(135deg, #1a1a2e, #0f3460); color: #fff; padding: 3.5rem 2rem; }
.article-hero .tag { font-size: 0.8rem; font-weight: 700; text-transform: uppercase; color: #4cc9f0; letter-spacing: 1px; margin-bottom: 0.8rem; }
.article-hero h1 { font-size: 2.2rem; max-width: 750px; line-height: 1.3; }
.article-hero .meta { color: #8892b0; margin-top: 1rem; font-size: 0.9rem; }
.article-body { max-width: 780px; margin: 3rem auto; padding: 0 2rem; }
.article-body h2 { font-size: 1.5rem; margin: 2rem 0 0.8rem; }
.article-body h3 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; }
.article-body p { margin-bottom: 1.2rem; color: #333; }
.article-body ul, .article-body ol { padding-left: 1.5rem; margin-bottom: 1.2rem; color: #333; }
.article-body li { margin-bottom: 0.5rem; }
.article-body .callout { background: #e8f0fe; border-left: 4px solid #4361ee; padding: 1rem 1.2rem; border-radius: 0 8px 8px 0; margin: 1.5rem 0; }
.article-body .coinbase-cta { background: linear-gradient(135deg, #0052ff, #1a73e8); color: #fff; border-radius: 12px; padding: 2rem; text-align: center; margin: 2rem 0; }
.article-body .coinbase-cta h3 { color: #fff; font-size: 1.3rem; margin-bottom: 0.5rem; }
.article-body .coinbase-cta p { color: rgba(255,255,255,0.85); margin-bottom: 1rem; }
.article-body .coinbase-cta .btn { background: #fff; color: #0052ff; }

@media (max-width: 600px) {
  .hero h1 { font-size: 2rem; }
  nav ul { display: none; }
}