:root{--primary: #6366f1;--primary-dark: #4f46e5;--text-main: #1f2937;--text-light: #6b7280;--bg-light: #f9fafb;--white: #ffffff;--gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%)}.home{background-color:var(--bg-light);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif}.container{max-width:1200px;margin:0 auto;padding:0 24px}.navbar{padding:24px 0;position:absolute;top:0;left:0;right:0;z-index:10}.nav-content{display:flex;justify-content:space-between;align-items:center}.logo{font-size:24px;font-weight:700;color:var(--white);text-shadow:0 2px 4px rgba(0,0,0,.1);display:flex;align-items:center;gap:8px}.nav-actions{display:flex;align-items:center;gap:24px}.nav-link{color:#fffffff2;text-decoration:none;font-weight:500;font-size:16px;transition:opacity .2s}.nav-link:hover{opacity:.8}.nav-btn{background:var(--white);color:var(--primary);padding:12px 24px;border-radius:50px;text-decoration:none;font-weight:600;font-size:15px;transition:transform .2s,box-shadow .2s}.nav-btn:hover{transform:translateY(-1px);box-shadow:0 4px 12px #00000026}.hero{background:var(--gradient);padding:160px 0 180px;color:var(--white);text-align:center}.hero-title{font-size:64px;font-weight:800;line-height:1.1;margin-bottom:24px;letter-spacing:-.02em}.hero-subtitle{font-size:20px;opacity:.95;max-width:640px;margin:0 auto 48px;line-height:1.6;font-weight:400}.hero-cta-group{display:flex;flex-direction:column;align-items:center;gap:24px}.primary-btn{background:var(--white);color:var(--primary);padding:18px 48px;border-radius:50px;font-size:18px;font-weight:700;text-decoration:none;box-shadow:0 10px 25px #0003;transition:transform .2s,box-shadow .2s}.primary-btn:hover{transform:translateY(-2px);box-shadow:0 15px 35px #00000040}.hero-login-prompt{font-size:16px;color:#ffffffe6;font-weight:500}.hero-login-prompt .text-link{color:var(--white);font-weight:700;text-decoration:underline;text-underline-offset:4px;margin-left:6px;transition:opacity 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var(--primary);display:flex;gap:20px;align-items:flex-start}.rec-icon{font-size:28px;margin-top:-2px}.recommendation-box p{margin:0;font-size:18px;color:var(--text-main);line-height:1.6;font-weight:500}.features-section{padding:20px 0 120px}.section-header{text-align:center;margin-bottom:70px}.section-header h2{font-size:36px;font-weight:800;color:var(--text-main);margin-bottom:16px}.section-header p{font-size:20px;color:var(--text-light);max-width:600px;margin:0 auto}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:32px}.feature-card{background:var(--white);padding:36px;border-radius:24px;transition:all .3s ease;border:1px solid #f3f4f6;display:flex;flex-direction:column;align-items:flex-start}.feature-card:hover{transform:translateY(-8px);box-shadow:0 20px 40px -10px #00000014;border-color:transparent}.feature-icon-wrapper{width:56px;height:56px;background:#eff6ff;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:24px;color:var(--primary)}.feature-card h3{font-size:20px;font-weight:700;color:var(--text-main);margin-bottom:12px}.feature-card p{color:var(--text-light);line-height:1.6;font-size:16px}.footer{background:var(--white);border-top:1px solid #f3f4f6;padding:60px 0}.footer-content{display:flex;justify-content:space-between;align-items:flex-end}.footer-brand span{font-weight:800;color:var(--text-main);font-size:20px;display:block;margin-bottom:8px}.footer-brand p{font-size:14px;color:var(--text-light)}.footer-links{font-size:14px;color:var(--text-light);font-weight:500}@media (max-width: 768px){.hero-title{font-size:42px}.hero-subtitle{font-size:18px}.aqi-card{padding:32px 24px}.aqi-card-body{flex-direction:column;gap:32px;text-align:center}.aqi-metric{border-bottom:1px solid 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480px){.auth-card{padding:30px 20px}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;color:#333}.container{max-width:1200px;margin:0 auto;padding:0 20px}