:root{--bg-color:#f8fafc;--text-primary:#0f172a;--accent:#6366f1;--accent-light:#e0e7ff}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6}.app-container{max-width:900px;margin:0 auto;padding:0 20px}.site-nav{border-bottom:1px solid #e2e8f0;justify-content:space-between;align-items:center;margin-bottom:40px;padding:16px 0;display:flex}.nav-logo{color:var(--accent);font-size:1.2rem;font-weight:700;text-decoration:none}.nav-links{gap:20px;display:flex}.nav-links a{color:#475569;font-size:.95rem;text-decoration:none}.nav-links a:hover{color:var(--accent)}@media (width<=600px){.site-nav{flex-direction:column;gap:10px}.nav-links{flex-wrap:wrap;justify-content:center;gap:12px}}.hero{text-align:center;margin-bottom:50px}.hero h1{color:#1e293b;margin-bottom:20px;font-size:2.5rem;line-height:1.2}.hero p{color:#475569;max-width:700px;margin-bottom:30px;margin-left:auto;margin-right:auto;font-size:1.15rem}@media (width<=600px){.hero h1{font-size:1.8rem}}.phone-mockup{background:#fff;border-radius:30px;max-width:400px;min-height:500px;margin:0 auto 50px;padding:20px;position:relative;overflow:hidden;box-shadow:0 25px 50px -12px #00000040}.camera-view{color:#fff;background:#000;border-radius:15px;justify-content:center;align-items:center;height:350px;margin-bottom:20px;display:flex;position:relative}.scan-line{background:#34d399;width:100%;height:2px;animation:2s linear infinite scan;position:absolute;top:0;left:0;box-shadow:0 0 10px 2px #34d39980}@keyframes scan{0%{top:0}50%{top:100%}to{top:0}}.btn-scan{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:50px;margin:0 auto;padding:15px 40px;font-size:1.2rem;font-weight:700;display:block}.features-section{margin-bottom:50px}.features-section h2{text-align:center;color:#1e293b;margin-bottom:30px;font-size:2rem}.features-grid{grid-template-columns:repeat(3,1fr);gap:24px;display:grid}@media (width<=700px){.features-grid{grid-template-columns:1fr}}.feature-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 1px 3px #0000001a}.feature-card h3{color:var(--accent);margin-bottom:10px;font-size:1.15rem}.feature-card p{color:#475569;font-size:.95rem}.subjects-section{margin-bottom:50px}.subjects-section h2{text-align:center;color:#1e293b;margin-bottom:12px;font-size:2rem}.subjects-section>p{text-align:center;color:#475569;max-width:700px;margin-bottom:30px;margin-left:auto;margin-right:auto}.subjects-grid{grid-template-columns:repeat(2,1fr);gap:20px;display:grid}@media (width<=600px){.subjects-grid{grid-template-columns:1fr}}.subject-card{color:inherit;background:#fff;border-radius:12px;padding:24px;text-decoration:none;transition:box-shadow .2s;display:block;box-shadow:0 1px 3px #0000001a}.subject-card:hover{box-shadow:0 4px 12px #00000026}.subject-card h3{color:var(--accent);margin-bottom:8px}.subject-card p{color:#475569;font-size:.95rem}.alert-box{text-align:left;background:#fef2f2;border:2px solid #f87171;border-radius:12px;margin-bottom:50px;padding:30px}.alert-box h3{color:#b91c1c;margin-bottom:10px;font-size:1.5rem}.alert-box a{color:#b91c1c;font-weight:700}.faq-section{margin-bottom:50px}.faq-section h2{text-align:center;color:#1e293b;margin-bottom:30px;font-size:2rem}.faq-item{background:#fff;border-radius:8px;margin-bottom:16px;padding:24px;box-shadow:0 1px 3px #00000014}.faq-item h3{color:#1e293b;margin-bottom:8px;font-size:1.1rem}.faq-item p{color:#475569;font-size:.95rem}.content-body{max-width:700px;margin:0 auto 50px}.content-body h2{color:#1e293b;margin:40px 0 16px;font-size:1.8rem}.content-body h3{color:#334155;margin:30px 0 12px;font-size:1.3rem}.content-body p{color:#475569;margin-bottom:16px;font-size:1.05rem}.content-body ul,.content-body ol{color:#475569;margin:0 0 16px 24px;font-size:1.05rem}.content-body li{margin-bottom:8px}.related-pages{background:var(--accent-light);border-radius:12px;margin:40px 0;padding:30px}.related-pages h3{color:var(--accent);margin-bottom:16px}.related-pages ul{margin:0;padding:0;list-style:none}.related-pages li{margin-bottom:8px}.related-pages a{color:var(--accent);font-weight:500;text-decoration:none}.related-pages a:hover{text-decoration:underline}.site-footer{text-align:center;border-top:1px solid #e2e8f0;margin-top:50px;padding:30px 0}.footer-links{flex-wrap:wrap;justify-content:center;gap:16px;margin-bottom:16px;display:flex}.footer-links a{color:#64748b;font-size:.9rem;text-decoration:none}.footer-links a:hover{color:var(--accent)}.site-footer p{color:#94a3b8;font-size:.85rem}