:root{
  --blue:#9bd7f5;
  --blue-deep:#3a8bb9;
  --cream:#fff4cf;
  --orange:#ffb06a;
  --orange-soft:#ffe0bd;
  --ink:#263544;
  --muted:#657481;
  --white:#fff;
  --line:#e5eef5;
  --shadow:0 18px 45px rgba(61,112,145,.13);
  --radius:28px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:#fffdf8;line-height:1.7}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block;height:auto}
.container{width:min(1160px,92vw);margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,253,248,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(229,238,245,.8)}
.nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:22px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:900;font-size:1.12rem;letter-spacing:.02em}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:18px;background:linear-gradient(135deg,var(--blue),var(--cream));color:#175676;box-shadow:var(--shadow)}
.site-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.site-nav a{padding:9px 14px;border-radius:999px;color:#51606b;font-weight:700;font-size:.95rem}
.site-nav a:hover,.site-nav a.active{background:#eef8fe;color:#1d6d99}
.nav-toggle{display:none;border:0;background:#eef8fe;border-radius:15px;width:46px;height:42px;font-size:1.2rem;color:#235a77}
.hero{padding:74px 0 48px;overflow:hidden}
.hero-home{background:radial-gradient(circle at 10% 15%,#fff0c6 0 16%,transparent 17%),radial-gradient(circle at 85% 10%,#d9f3ff 0 18%,transparent 19%),linear-gradient(180deg,#fffdf8 0%,#f5fbff 100%)}
.hero-grid,.page-hero-grid,.split{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero-copy h1,.page-hero h1{font-size:clamp(2.15rem,5vw,4.6rem);line-height:1.12;margin:14px 0 18px;letter-spacing:-.045em}
.hero-copy p,.page-hero p,.section-head p{font-size:1.08rem;color:var(--muted);max-width:720px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 13px;border-radius:999px;background:#fff4d3;color:#986b12;font-weight:800;font-size:.82rem;letter-spacing:.04em;text-transform:uppercase}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--orange)}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin:30px 0 22px}
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:13px 22px;font-weight:900;border:1px solid transparent;cursor:pointer;font-size:1rem}
.btn.primary{background:linear-gradient(135deg,#ffba75,#ffcf91);color:#60320a;box-shadow:0 12px 28px rgba(255,176,106,.28)}
.btn.secondary{background:#fff;color:#256f95;border-color:#d7edf8}
.trust-strip{display:flex;flex-wrap:wrap;gap:10px}
.trust-strip span,.tag-cloud span{border-radius:999px;background:#fff;border:1px solid #e4f1f8;padding:8px 14px;color:#3e6b83;font-weight:800}
.card-illustration{border-radius:38px;padding:22px;background:linear-gradient(135deg,#eaf8ff,#fff6d7);box-shadow:var(--shadow);position:relative}
.card-illustration::after{content:"";position:absolute;right:-18px;bottom:-18px;width:110px;height:110px;border-radius:36px;background:rgba(255,176,106,.22);z-index:-1}
.section{padding:72px 0}
.soft-bg{background:#f3fbff}
.section-head{display:flex;flex-direction:column;align-items:flex-start;gap:10px;margin-bottom:30px}
.section-head h2,.split h2,.value-timeline h2,.alert-box h2,.contact-form h2,.faq-list h2{font-size:clamp(1.7rem,3.4vw,2.65rem);line-height:1.18;margin:0;letter-spacing:-.03em}
.age-grid,.feature-grid,.cards-grid,.feedback-grid,.question-grid,.video-grid{display:grid;gap:20px}
.age-grid{grid-template-columns:repeat(4,1fr)}
.age-card,.mini-card,.guide-card,.feature-grid article,.content-card,.list-cards article,.video-card,.domain-card,.info-panel,.alert-box,.topic-strip,.cta-card,.faq-list details,.feedback-grid blockquote{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.age-card,.mini-card,.guide-card{padding:24px}
.age-card strong,.mini-card span,.guide-card strong,.video-card span,.content-card span,.list-cards span,.domain-card span{display:inline-flex;margin-bottom:10px;color:#287196;background:#eef9ff;padding:4px 10px;border-radius:999px;font-size:.84rem;font-weight:900}
.age-card h3,.mini-card h3,.content-card h3,.video-card h3,.list-cards h3{margin:4px 0 8px;font-size:1.16rem;line-height:1.35}
.age-card p,.mini-card p,.guide-card p,.feature-grid p,.content-card p,.list-cards p,.video-card p{color:var(--muted);margin:0}
.age-card>span{display:inline-block;margin-top:16px;padding:5px 10px;border-radius:999px;background:var(--cream);font-weight:800;color:#7a5b11}
.split.reverse{grid-template-columns:.9fr 1.1fr}
.large-illustration,.image-stack img{border-radius:30px;background:#fff;box-shadow:var(--shadow);border:1px solid var(--line);padding:14px}
.check-list{padding:0;margin:22px 0 0;list-style:none;display:grid;gap:12px}
.check-list li{position:relative;padding-left:30px;color:#50606d}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;width:22px;height:22px;border-radius:50%;background:#eaf8ff;color:#2484af;display:inline-flex;align-items:center;justify-content:center;font-weight:900;line-height:1}
.note-card{margin-top:20px;padding:20px;border-radius:24px;background:#fff7dc;border:1px solid #ffe7ad;color:#6b5420;font-weight:700}
.content-grid.three{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.content-card{overflow:hidden}
.content-card div,.video-card div,.list-cards article{padding:20px}
.content-card img{width:100%;border-bottom:1px solid var(--line)}
.safety-section{background:linear-gradient(135deg,#3a8bb9,#6dbfe3);color:#fff}
.section-head.light p,.section-head.light h2{color:#fff}
.safety-section .eyebrow{background:rgba(255,255,255,.18);color:#fff}
.feature-grid{grid-template-columns:repeat(3,1fr)}
.feature-grid article{padding:22px;color:var(--ink)}
.feature-grid img{border-radius:22px;background:#f7fcff;margin-bottom:16px}
.topic-strip{display:grid;grid-template-columns:1fr 320px;gap:22px;align-items:center;padding:28px;background:linear-gradient(135deg,#fff,#fff8df)}
.topic-strip h3{font-size:2rem;margin:8px 0}.topic-strip p{color:var(--muted)}
.cards-grid{grid-template-columns:repeat(4,1fr)}
.testimonials{background:linear-gradient(180deg,#fffdf8,#f8fcff)}
.feedback-grid{grid-template-columns:repeat(2,1fr)}
.feedback-grid blockquote{margin:0;padding:26px;display:grid;grid-template-columns:72px 1fr;gap:16px;align-items:center}
.feedback-grid img{width:72px;height:72px;border-radius:50%;background:#eef9ff}
.feedback-grid p{margin:0;color:#4e5f6b}.feedback-grid cite{font-style:normal;color:#2a7aa0;font-weight:900}
.faq-section{background:#fff}.faq-list{display:grid;gap:14px}
.faq-list details{padding:18px 22px}.faq-list summary{cursor:pointer;font-weight:900;color:#2e4a5d}.faq-list p{color:var(--muted);margin-bottom:0}
.contact-cta{padding-top:0}.cta-card{padding:28px;display:flex;justify-content:space-between;align-items:center;gap:20px;background:linear-gradient(135deg,#eaf8ff,#fff3d2)}
.page-hero{padding:64px 0;background:linear-gradient(180deg,#fffdf8,#f3fbff)}
.page-hero img{border-radius:32px;background:#fff;box-shadow:var(--shadow);border:1px solid var(--line);padding:16px}
.info-panel{padding:26px}.info-panel h3{font-size:1.6rem;margin:0}
.value-timeline{display:grid;gap:18px}.value-timeline article{border-left:6px solid var(--blue);padding:20px 24px;background:#fff;border-radius:0 24px 24px 0;box-shadow:var(--shadow)}
.value-timeline strong{font-size:1.2rem;color:#2679a3}.value-timeline p{margin:8px 0 0;color:var(--muted)}
.list-cards article{padding:0;overflow:hidden}.list-cards img{width:100%;border-bottom:1px solid var(--line)}.list-cards ul{color:#5a6b77;margin:14px 0 0}
.step-list{display:grid;gap:12px;margin-top:22px}.step-list div{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px}.step-list strong{width:34px;height:34px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:var(--orange-soft);color:#7a3e00}
.tag-cloud{display:flex;flex-wrap:wrap;gap:12px}
.responsive-table{overflow:auto;border-radius:24px;box-shadow:var(--shadow);border:1px solid var(--line);background:#fff}table{border-collapse:collapse;width:100%;min-width:760px}th,td{text-align:left;padding:17px 18px;border-bottom:1px solid var(--line)}th{background:#eaf8ff;color:#245d7a}td{color:#4e5f6b}tr:last-child td{border-bottom:0}
.alert-box{padding:30px;background:linear-gradient(135deg,#fff6d9,#fff)}.alert-box p{color:var(--muted);font-size:1.08rem}
.guide-card h2{font-size:1.45rem;margin:0 0 8px}.question-grid{grid-template-columns:repeat(4,1fr)}.question-grid p{margin:0;background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:var(--shadow);font-weight:800;color:#3f596a}
.video-grid{grid-template-columns:repeat(3,1fr)}.video-card{overflow:hidden}.video-card img{width:100%;border-bottom:1px solid var(--line)}
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:start}.contact-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px;display:grid;gap:16px}.contact-form label{display:grid;gap:8px;font-weight:900;color:#2f4b5d}.contact-form input,.contact-form select,.contact-form textarea{width:100%;border:1px solid #dcebf3;border-radius:16px;padding:12px 14px;font:inherit;color:var(--ink);background:#fbfdff}.form-note{font-size:.92rem;color:var(--muted);margin:0}.contact-aside{display:grid;gap:18px}.domain-card{padding:24px}.domain-card strong{display:block;font-size:1.35rem;word-break:break-word;color:#246f98}.domain-card p{color:var(--muted);margin-bottom:0}
.site-footer{padding:54px 0 20px;background:#263544;color:#dce8ef}.footer-grid{display:grid;grid-template-columns:1.4fr .8fr .8fr;gap:28px}.site-footer a,.site-footer span{display:block;color:#dce8ef;margin:8px 0}.footer-brand{color:#fff}.site-footer h3{color:#fff}.site-footer p{max-width:520px;color:#c3d2dc}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:16px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:#c3d2dc}
@media (max-width:980px){.nav-toggle{display:inline-flex;align-items:center;justify-content:center}.site-nav{position:absolute;top:76px;left:4vw;right:4vw;display:none;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:24px;padding:14px;box-shadow:var(--shadow)}.site-nav.open{display:flex}.site-nav a{display:block}.hero-grid,.page-hero-grid,.split,.split.reverse,.contact-grid{grid-template-columns:1fr}.age-grid,.cards-grid,.question-grid{grid-template-columns:repeat(2,1fr)}.content-grid.three,.feature-grid,.video-grid,.feedback-grid{grid-template-columns:1fr}.topic-strip{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.nav-wrap{height:68px}.site-nav{top:68px}.hero,.page-hero{padding:42px 0}.section{padding:48px 0}.hero-actions,.cta-card{align-items:stretch;flex-direction:column}.btn{width:100%}.age-grid,.cards-grid,.question-grid,.footer-grid{grid-template-columns:1fr}.feedback-grid blockquote{grid-template-columns:1fr}.hero-copy h1,.page-hero h1{font-size:2.2rem}.topic-strip h3{font-size:1.55rem}}