*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #42b983;--bg-color: #f5f7fa;--card-bg: #ffffff;--text-color: #2c3e50;--text-secondary: #7f8c8d}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background:var(--bg-color);color:var(--text-color);transition:all .3s ease}body.dark-mode{--bg-color: #1a1a2e;--card-bg: #16213e;--text-color: #eaeaea;--text-secondary: #a0a0a0}.container{min-height:100vh;display:flex;flex-direction:column}.header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:3rem 1rem;text-align:center}.header h1{font-size:2.5rem;margin-bottom:.5rem}.subtitle{font-size:1.2rem;opacity:.9}.main{flex:1;padding:2rem;max-width:1200px;margin:0 auto;width:100%}.card{background:var(--card-bg);border-radius:12px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:0 4px 6px #0000001a}.card h2{color:var(--primary-color);margin-bottom:.5rem}.card h3{margin-bottom:1rem;color:var(--text-color)}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:1.5rem}.info-card{background:var(--card-bg);border-radius:12px;padding:1.5rem;text-align:center;box-shadow:0 4px 6px #0000001a}.info-card .icon{font-size:2.5rem;margin-bottom:.5rem}.info-card h3{font-size:1rem;color:var(--text-secondary);margin-bottom:.25rem}.info-card p{font-size:1.1rem;font-weight:600;color:var(--primary-color)}.system-info p{padding:.5rem 0;border-bottom:1px solid rgba(0,0,0,.1)}.system-info p:last-child{border-bottom:none}.btn{background:var(--primary-color);color:#fff;border:none;padding:.75rem 1.5rem;border-radius:8px;font-size:1rem;cursor:pointer;transition:transform .2s,box-shadow .2s}.btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #42b98366}.btn-secondary{background:#667eea}.footer{background:var(--card-bg);padding:1.5rem;text-align:center;color:var(--text-secondary);border-top:1px solid rgba(0,0,0,.1)}@media (max-width: 768px){.header h1{font-size:1.8rem}.main{padding:1rem}.info-grid{grid-template-columns:1fr}}