*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#fff;--bg-soft:#f4f7fb;--text:#0f172a;--muted:#64748b;
  --line:#e2e8f0;--primary:#2563eb;--primary-dark:#1d4ed8;
  --accent:#e50914;--radius:12px;--shadow:0 4px 24px rgba(15,23,42,.08);
  --max:1120px;--header-h:64px;
}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.6;font-size:16px}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.container{width:min(100% - 2rem,var(--max));margin-inline:auto}
.skip-link{position:absolute;left:-9999px;top:0;z-index:9999;padding:.5rem 1rem;background:var(--primary);color:#fff}
.skip-link:focus{left:1rem;top:1rem}

.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);height:var(--header-h)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:1rem}
.logo{display:flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.05rem}
.logo-img{width:32px;height:32px;border-radius:8px;object-fit:cover;flex-shrink:0;display:block}
.nav-desktop{display:flex;align-items:center;gap:1.25rem;flex-wrap:wrap}
.nav-desktop a{font-size:.9rem;color:var(--muted);transition:color .2s}
.nav-desktop a:hover,.nav-desktop a[aria-current="page"]{color:var(--primary)}
.header-actions{display:flex;align-items:center;gap:.75rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.35rem;padding:.55rem 1.1rem;border-radius:999px;font-size:.9rem;font-weight:600;border:none;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 12px rgba(37,99,235,.35)}
.btn-primary:hover{background:var(--primary-dark)}
.btn-dark{background:var(--text);color:#fff}
.btn-dark:hover{background:#1e293b}
.btn-outline{background:#fff;color:var(--text);border:1px solid var(--line)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-sm{padding:.4rem .85rem;font-size:.85rem}
.nav-toggle{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text);transition:transform .2s,opacity .2s}
.nav-mobile{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:1rem;flex-direction:column;gap:.5rem;box-shadow:var(--shadow)}
.nav-mobile a{padding:.65rem .5rem;border-radius:8px;color:var(--text)}
.nav-mobile a:hover{background:var(--bg-soft)}
.site-header.is-open .nav-mobile{display:flex}
.site-header.is-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.site-header.is-open .nav-toggle span:nth-child(2){opacity:0}
.site-header.is-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.hero{position:relative;padding:3.5rem 0 4rem;overflow:hidden;background:linear-gradient(180deg,#eef4ff 0%,#fff 55%)}
.hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;pointer-events:none}
.hero::before{width:280px;height:280px;background:#c7d2fe;top:-80px;right:10%}
.hero::after{width:200px;height:200px;background:#fecdd3;bottom:0;left:5%}
.hero-inner{position:relative;text-align:center;max-width:720px;margin-inline:auto}
.hero-badge{display:inline-block;font-size:.8rem;color:var(--primary);background:#eff6ff;padding:.25rem .75rem;border-radius:999px;margin-bottom:1rem;font-weight:600}
.hero h1{font-size:clamp(1.75rem,4vw,2.5rem);line-height:1.25;margin-bottom:.75rem;font-weight:800}
.hero .tagline{font-size:clamp(1rem,2.5vw,1.25rem);color:var(--primary);font-weight:700;margin-bottom:.75rem}
.hero .desc{color:var(--muted);font-size:.95rem;margin-bottom:1.75rem;max-width:560px;margin-inline:auto}
.hero-btns{display:flex;flex-wrap:wrap;gap:.75rem;justify-content:center}

.section{padding:3.5rem 0}
.section-alt{background:var(--bg-soft)}
.section-head{text-align:center;margin-bottom:2.25rem}
.section-head h2{font-size:clamp(1.35rem,3vw,1.85rem);margin-bottom:.5rem}
.section-head p{color:var(--muted);font-size:.95rem;max-width:520px;margin-inline:auto}
.section-label{display:inline-flex;align-items:center;gap:.5rem;font-size:.75rem;font-weight:700;color:var(--muted);margin-bottom:.75rem;text-transform:uppercase;letter-spacing:.04em}
.section-label span{background:var(--text);color:#fff;padding:.15rem .45rem;border-radius:4px}

.plans-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1rem;align-items:stretch}
.plan-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.25rem;display:flex;flex-direction:column;box-shadow:0 1px 0 rgba(0,0,0,.03);transition:border-color .2s,box-shadow .2s}
.plan-card:hover{border-color:#93c5fd;box-shadow:var(--shadow)}
.plan-card.featured{border-color:var(--primary);box-shadow:0 0 0 1px var(--primary),var(--shadow);position:relative}
.plan-badge{position:absolute;top:-10px;left:50%;transform:translateX(-50%);background:var(--primary);color:#fff;font-size:.7rem;padding:.2rem .65rem;border-radius:999px;font-weight:700;white-space:nowrap}
.plan-top{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.75rem}
.plan-icon{width:36px;height:36px;border-radius:8px;background:#fee2e2;color:var(--accent);display:grid;place-items:center;font-weight:800;font-size:.7rem;flex-shrink:0}
.plan-stock{font-size:.7rem;font-weight:600;padding:.2rem .55rem;border-radius:999px;white-space:nowrap}
.plan-stock.ok{color:#15803d;background:#dcfce7}
.plan-stock.low{color:#b91c1c;background:#fee2e2}
.plan-card h3{font-size:1rem;margin-bottom:.25rem}
.plan-card .plan-sub{font-size:.8rem;color:var(--muted);margin-bottom:1rem;min-height:2.5em}
.plan-price{font-size:1.75rem;font-weight:800;color:var(--primary);margin-bottom:.15rem}
.plan-price small{font-size:.85rem;font-weight:500;color:var(--muted)}
.plan-card .btn{margin:1rem 0; width:100%}
.plan-features{font-size:.8rem;color:var(--muted);flex:1}
.plan-features li{padding:.25rem 0;padding-left:1.25rem;position:relative}
.plan-features li::before{content:"";position:absolute;left:0;top:.55rem;width:6px;height:6px;border-radius:50%;background:var(--primary)}

.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1.25rem;counter-reset:step}
.step-item{text-align:center;padding:1.5rem 1rem;background:#fff;border-radius:var(--radius);border:1px solid var(--line)}
.step-item::before{counter-increment:step;content:counter(step);display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--primary);color:#fff;font-weight:700;margin-bottom:.75rem;font-size:.95rem}
.step-item h3{font-size:1rem;margin-bottom:.35rem}
.step-item p{font-size:.85rem;color:var(--muted)}

.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:start}
.intro-text h2{text-align:left;margin-bottom:1rem;font-size:1.5rem}
.intro-text p{color:var(--muted);font-size:.95rem;margin-bottom:1rem}
.intro-points{display:grid;gap:.75rem}
.intro-points li{display:flex;gap:.75rem;align-items:flex-start;font-size:.9rem}
.intro-points strong{display:block;color:var(--text);margin-bottom:.15rem}
.intro-visual{background:linear-gradient(135deg,#1e293b,#334155);border-radius:var(--radius);padding:2rem;color:#fff;min-height:220px;display:flex;flex-direction:column;justify-content:center}
.intro-visual h3{font-size:1.25rem;margin-bottom:.5rem}
.intro-visual p{font-size:.9rem;opacity:.85}

.faq-list{max-width:720px;margin-inline:auto;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:last-child{border-bottom:none}
.faq-q{width:100%;text-align:left;padding:1.1rem 1.25rem;background:#fff;border:none;cursor:pointer;font-size:1rem;font-weight:600;display:flex;justify-content:space-between;align-items:center;gap:1rem;color:var(--text)}
.faq-q:hover{background:var(--bg-soft)}
.faq-q::after{content:"";width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s;flex-shrink:0}
.faq-item.is-open .faq-q::after{transform:rotate(-135deg);margin-top:4px}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease}
.faq-a-inner{padding:0 1.25rem 1.1rem;color:var(--muted);font-size:.92rem;line-height:1.65}

.page-hero{padding:2.5rem 0 1.5rem}
.page-hero h1{font-size:clamp(1.5rem,3vw,2rem);margin-bottom:.5rem}
.page-hero p{color:var(--muted);font-size:.95rem}

.about-blocks{display:grid;gap:1.5rem}
.about-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem}
.about-card h2{font-size:1.15rem;margin-bottom:.75rem}
.about-card p,.about-card li{color:var(--muted);font-size:.92rem}
.about-card ul{margin-top:.5rem;padding-left:1.25rem;list-style:disc}
.about-card li{margin-bottom:.35rem}

.site-footer{background:#0f172a;color:#94a3b8;padding:2.5rem 0 1.5rem;margin-top:2rem}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2rem;margin-bottom:2rem}
.footer-brand .logo{color:#fff;margin-bottom:.75rem}
.footer-brand p{font-size:.85rem;line-height:1.7;max-width:320px}
.footer-col h3{color:#fff;font-size:.9rem;margin-bottom:.75rem}
.footer-col a{display:block;font-size:.85rem;padding:.25rem 0;color:#94a3b8}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #334155;padding-top:1rem;font-size:.8rem;text-align:center}

@media(max-width:1024px){
  .plans-grid{grid-template-columns:repeat(3,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-desktop,.header-actions .btn-outline{display:none}
  .nav-toggle{display:flex}
  .site-header{position:relative}
  .plans-grid{grid-template-columns:1fr;max-width:400px;margin-inline:auto}
  .steps{grid-template-columns:1fr}
  .intro-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:1.5rem}
  .hero{padding:2.5rem 0 3rem}
  .hero-btns{flex-direction:column;align-items:stretch}
  .hero-btns .btn{width:100%}
}
@media(max-width:480px){
  .header-actions .btn-sm span.hide-mobile{display:none}
}