*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#2563eb;--primary-dark:#1d4ed8;--secondary:#0ea5e9;--dark:#0f172a;--gray-900:#1e293b;--gray-700:#334155;--gray-500:#64748b;--gray-300:#cbd5e1;--gray-100:#f1f5f9;--white:#ffffff}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;color:var(--gray-900);line-height:1.6;background:var(--white)}
a{color:var(--primary);text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
nav{position:fixed;top:0;left:0;right:0;background:rgba(255,255,255,0.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--gray-100);z-index:1000;height:72px}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between}
.nav-brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:1.25em;color:var(--dark)}
.nav-brand img{width:40px;height:40px;border-radius:10px}
.nav-links{display:flex;gap:32px}
.nav-links a{color:var(--gray-700);font-weight:500;transition:color 0.2s}
.nav-links a:hover{color:var(--primary)}
.hero{padding:160px 0 100px;background:linear-gradient(180deg,#f8fafc 0%,#ffffff 100%)}
.hero-content{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}
.hero-text h1{font-size:3.2em;font-weight:800;color:var(--dark);line-height:1.2;margin-bottom:24px}
.hero-text h1 span{background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-text p{font-size:1.25em;color:var(--gray-500);margin-bottom:32px;line-height:1.7}
.hero-stats{display:flex;gap:48px;margin-top:48px;padding-top:32px;border-top:1px solid var(--gray-100)}
.stat-item{text-align:left}
.stat-num{font-size:2em;font-weight:800;color:var(--primary)}
.stat-label{color:var(--gray-500);font-size:0.95em;margin-top:4px}
.hero-card{background:var(--white);border-radius:24px;padding:40px;box-shadow:0 25px 80px rgba(0,0,0,0.08);border:1px solid var(--gray-100)}
.card-title{font-size:1.1em;color:var(--gray-500);margin-bottom:24px;text-align:center}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-weight:600;margin-bottom:8px;color:var(--gray-700);font-size:0.95em}
.form-group input,.form-group select{width:100%;padding:14px 16px;border:1px solid var(--gray-300);border-radius:10px;font-size:1em;transition:all 0.2s;background:var(--white)}
.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,0.1)}
.quick-select{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.quick-btn{padding:6px 14px;background:var(--gray-100);border:1px solid var(--gray-200);border-radius:6px;cursor:pointer;font-size:0.85em;color:var(--gray-700);transition:all 0.2s}
.quick-btn:hover{background:var(--primary);color:var(--white);border-color:var(--primary)}
.btn-primary{width:100%;padding:16px;background:var(--primary);color:var(--white);border:none;border-radius:10px;font-size:1.05em;font-weight:600;cursor:pointer;transition:all 0.2s}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}
.result{margin-top:24px;padding:24px;background:var(--gray-100);border-radius:12px;display:none;text-align:center}
.result.show{display:block;animation:fadeIn 0.3s}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.result-label{font-size:0.9em;color:var(--gray-500);margin-bottom:8px}
.result-date{font-size:1.8em;font-weight:700;color:var(--dark);margin-bottom:8px}
.result-days{font-size:1em;color:var(--gray-500);margin-bottom:12px}
.status{display:inline-block;padding:8px 20px;border-radius:20px;font-size:0.9em;font-weight:600}
.status.safe{background:#dcfce7;color:#166534}
.status.warning{background:#fef9c3;color:#854d0e}
.status.danger{background:#fee2e2;color:#991b1b}
.section{padding:100px 0}
.section-gray{background:var(--gray-100)}
.section-header{text-align:center;max-width:700px;margin:0 auto 60px}
.section-header h2{font-size:2.2em;font-weight:700;color:var(--dark);margin-bottom:16px}
.section-header p{font-size:1.1em;color:var(--gray-500)}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.feature-item{background:var(--white);padding:40px 32px;border-radius:16px;border:1px solid var(--gray-100);transition:all 0.3s}
.feature-item:hover{box-shadow:0 20px 60px rgba(0,0,0,0.08);transform:translateY(-4px)}
.feature-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;margin-bottom:24px}
.feature-icon.blue{background:linear-gradient(135deg,#dbeafe,#bfdbfe)}
.feature-icon.green{background:linear-gradient(135deg,#dcfce7,#bbf7d0)}
.feature-icon.purple{background:linear-gradient(135deg,#ede9fe,#ddd6fe)}
.feature-icon.orange{background:linear-gradient(135deg,#ffedd5,#fed7aa)}
.feature-icon.pink{background:linear-gradient(135deg,#fce7f3,#fbcfe8)}
.feature-icon.cyan{background:linear-gradient(135deg,#cffafe,#a5f3fc)}
.feature-icon svg{width:28px;height:28px}
.feature-item h3{font-size:1.2em;color:var(--dark);margin-bottom:12px}
.feature-item p{color:var(--gray-500);line-height:1.7;font-size:0.95em}
.food-section{background:var(--white)}
.food-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.food-card{padding:24px;background:var(--gray-100);border-radius:12px;display:flex;justify-content:space-between;align-items:center}
.food-card span:first-child{font-weight:500;color:var(--gray-700)}
.food-card span:last-child{font-weight:700;color:var(--primary)}
.faq-section{background:var(--gray-100)}
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--white);border-radius:12px;padding:28px 32px;margin-bottom:16px;border:1px solid var(--gray-100)}
.faq-item h3{font-size:1.1em;color:var(--dark);margin-bottom:12px;display:flex;align-items:flex-start;gap:12px}
.faq-item h3::before{content:'Q';flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;background:var(--primary);color:var(--white);border-radius:6px;font-size:0.85em;font-weight:700}
.faq-item p{color:var(--gray-500);line-height:1.8;padding-left:38px}
.content-section{background:var(--white)}
.content-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.content-text h2{font-size:1.8em;font-weight:700;color:var(--dark);margin-bottom:20px}
.content-text p{color:var(--gray-500);line-height:1.8;margin-bottom:16px}
.content-list{list-style:none;padding:0}
.content-list li{padding:12px 0;padding-left:28px;position:relative;color:var(--gray-700)}
.content-list li::before{content:'✓';position:absolute;left:0;color:var(--primary);font-weight:700}
.content-img{background:linear-gradient(135deg,#f0f9ff,#e0f2fe);border-radius:20px;padding:40px;display:flex;align-items:center;justify-content:center;min-height:360px}
.content-img img{max-width:100%;border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,0.1)}
footer{background:var(--dark);color:var(--gray-300);padding:60px 0 30px}
.footer-top{display:flex;justify-content:space-between;align-items:flex-start;padding-bottom:40px;border-bottom:1px solid var(--gray-700)}
.footer-brand{max-width:300px}
.footer-brand h3{color:var(--white);font-size:1.3em;margin-bottom:12px;display:flex;align-items:center;gap:10px}
.footer-brand h3 img{width:32px;height:32px;border-radius:8px}
.footer-brand p{font-size:0.95em;line-height:1.7}
.footer-links-group h4{color:var(--white);font-size:1em;margin-bottom:16px}
.footer-links-group ul{list-style:none}
.footer-links-group li{margin-bottom:10px}
.footer-links-group a{color:var(--gray-300);font-size:0.95em;transition:color 0.2s}
.footer-links-group a:hover{color:var(--white)}
.footer-bottom{padding-top:30px;display:flex;justify-content:space-between;align-items:center;font-size:0.9em}
.footer-bottom a{color:var(--gray-300)}
.footer-bottom a:hover{color:var(--white)}
@media(max-width:1024px){.hero-content{grid-template-columns:1fr;gap:50px}.hero-text{text-align:center}.hero-stats{justify-content:center}.features-grid{grid-template-columns:repeat(2,1fr)}.food-grid{grid-template-columns:repeat(2,1fr)}.content-grid{grid-template-columns:1fr}}
@media(max-width:768px){.nav-links{display:none}.hero{padding:100px 0 40px}.hero-content{gap:40px}.hero-text h1{font-size:2em}.hero-text p{font-size:1.05em}.hero-stats{gap:24px;flex-wrap:wrap}.stat-item{min-width:80px}.stat-num{font-size:1.5em}.hero-card{padding:28px 20px}.card-title{font-size:1em}.form-group label{font-size:0.9em}.form-group input,.form-group select{padding:12px 14px;font-size:0.95em}.quick-select{gap:6px}.quick-btn{padding:6px 12px;font-size:0.8em}.btn-primary{padding:14px;font-size:1em}.result{padding:20px;margin-top:20px}.result-date{font-size:1.5em}.result-days{font-size:0.95em}.status{padding:6px 16px;font-size:0.85em}.features-grid{grid-template-columns:1fr}.feature-item{padding:28px 24px}.food-grid{grid-template-columns:1fr}.food-card{padding:16px}.section{padding:60px 0}.section-header{margin-bottom:40px}.section-header h2{font-size:1.6em}.content-grid{gap:40px}.content-text h2{font-size:1.4em}.faq-item{padding:20px}.faq-item h3{font-size:1em}.faq-item p{padding-left:32px;font-size:0.95em}.footer-top{flex-direction:column;gap:32px}.footer-bottom{flex-direction:column;gap:12px;text-align:center}}
@media(max-width:480px){.hero{padding:90px 0 30px}.hero-text h1{font-size:1.7em}.hero-stats{justify-content:space-around}.container{padding:0 16px}.hero-card{padding:24px 16px;border-radius:20px}.nav-inner{padding:0 16px}.nav-brand{font-size:1.1em}.nav-brand img{width:32px;height:32px}}