/* =========================================================
   Creainfla design system
   Inspired by the discipline of restrained, premium minimalism:
   near-black ink, generous whitespace, one accent at a time.
   ========================================================= */
:root{
  --ink:#1d1d1f;          /* primary text */
  --ink-2:#6e6e73;        /* secondary text */
  --ink-3:#86868b;        /* tertiary / captions */
  --paper:#ffffff;
  --paper-2:#f5f5f7;      /* soft gray section */
  --line:#d2d2d7;
  --green:#40bb6a;        /* brand */
  --purple:#5e2590;       /* brand */
  --green-soft:#eaf7ef;
  --purple-soft:#f3ecf8;
  --radius:20px;
  --maxw:1120px;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display","Helvetica Neue",Helvetica,Arial,"PingFang SC","PingFang TC",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.6;font-weight:400;letter-spacing:-.01em}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.08)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:56px}
.brand{display:flex;align-items:center;height:28px}
.brand svg{height:26px;width:auto}
.nav-links{display:flex;gap:30px;align-items:center;font-size:14px;color:var(--ink)}
.nav-links a{opacity:.85;transition:.2s}
.nav-links a:hover{opacity:1;color:var(--purple)}
.nav-cta{background:var(--ink);color:#fff;padding:8px 18px;border-radius:980px;font-size:14px;font-weight:500;transition:.2s}
.nav-cta:hover{background:var(--purple)}

/* ---------- hero ---------- */
.hero{text-align:center;padding:clamp(72px,12vw,150px) 0 clamp(56px,8vw,110px)}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.24em;text-transform:uppercase;color:var(--ink-3);margin-bottom:22px}
.hero h1{font-size:clamp(44px,8vw,96px);line-height:1.02;font-weight:600;letter-spacing:-.035em}
.hero .accent{background:linear-gradient(90deg,var(--green),var(--purple));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{max-width:640px;margin:26px auto 0;font-size:clamp(18px,2.4vw,24px);line-height:1.45;color:var(--ink-2);font-weight:400}
.hero .ctas{margin-top:36px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:980px;font-size:16px;font-weight:500;transition:.2s}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--purple)}
.btn-ghost{color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--ink)}

/* ---------- sections ---------- */
section{padding:clamp(64px,8vw,110px) 0}
.sec-alt{background:var(--paper-2)}
.sec-head{max-width:720px;margin-bottom:56px}
.sec-head .kicker{font-size:13px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-3);margin-bottom:14px}
.sec-head h2{font-size:clamp(30px,4.6vw,52px);line-height:1.08;font-weight:600;letter-spacing:-.025em}
.sec-head p{font-size:18px;color:var(--ink-2);margin-top:18px}

/* four genes */
.genes{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.gene{padding:32px 28px;border-radius:var(--radius);background:var(--paper);border:1px solid var(--line)}
.gene .num{font-size:13px;font-weight:600;color:var(--ink-3);letter-spacing:.16em}
.gene h3{font-size:22px;font-weight:600;margin:16px 0 8px;letter-spacing:-.02em}
.gene p{font-size:15px;color:var(--ink-2)}
.gene .zh{font-size:14px;color:var(--ink-3);margin-top:10px}

/* series grid */
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{position:relative;border-radius:var(--radius);overflow:hidden;background:var(--paper-2);min-height:300px;display:flex;flex-direction:column;justify-content:flex-end;padding:34px;transition:transform .3s ease, box-shadow .3s ease}
.card:hover{transform:translateY(-4px);box-shadow:0 24px 48px rgba(0,0,0,.10)}
.card .tag{font-size:12px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-3)}
.card h3{font-size:28px;font-weight:600;margin:12px 0 6px;letter-spacing:-.02em}
.card p{font-size:15px;color:var(--ink-2);max-width:420px}
.card .go{margin-top:18px;font-size:15px;font-weight:500;color:var(--purple)}
.card-a{background:linear-gradient(135deg,#eaf7ef,#f3ecf8)}
.card-b{background:linear-gradient(135deg,#f3ecf8,#eaf7ef)}

/* story band */
.story-band{text-align:center;max-width:760px;margin:0 auto}
.story-band .big{font-size:clamp(30px,4.8vw,56px);line-height:1.1;font-weight:600;letter-spacing:-.025em}
.story-band .mid{font-size:18px;color:var(--ink-2);margin-top:22px}

/* table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{width:100%;border-collapse:collapse;min-width:640px}
th,td{text-align:left;padding:18px 22px;border-bottom:1px solid var(--line);font-size:15px;vertical-align:top}
th{background:var(--ink);color:#fff;font-weight:500;letter-spacing:.02em}
tr:nth-child(even) td{background:var(--paper-2)}
td:first-child{font-weight:600}
td.ox{background:var(--green-soft)!important}
td.ox::before{content:"✓ ";color:var(--green);font-weight:700}

/* product list */
.prod{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.prod-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.prod-item .cat{font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--purple)}
.prod-item h3{font-size:18px;font-weight:600;margin:10px 0 6px;line-height:1.3}
.prod-item .spec{font-size:14px;color:var(--ink-2);margin:8px 0}
.prod-item .price{font-size:16px;font-weight:600;margin-top:12px}

/* FAQ */
.faq{max-width:760px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line);padding:22px 0}
.faq summary{font-size:18px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::after{content:"+";font-size:24px;font-weight:400;color:var(--ink-3)}
.faq details[open] summary::after{content:"–"}
.faq details p{font-size:15px;color:var(--ink-2);margin-top:14px;max-width:640px}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-item{padding:26px;border:1px solid var(--line);border-radius:var(--radius)}
.contact-item h3{font-size:16px;font-weight:600;margin-bottom:6px}
.contact-item p,.contact-item a{font-size:17px;color:var(--ink-2)}
.contact-item a{color:var(--purple);font-weight:500}

/* footer */
footer{background:var(--paper-2);padding:70px 0 40px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:44px;border-bottom:1px solid var(--line)}
.foot-grid h4{font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin-bottom:14px}
.foot-grid a,.foot-grid p{display:block;font-size:14px;color:var(--ink-2);margin-bottom:8px}
.foot-grid a:hover{color:var(--purple)}
.foot-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding-top:26px;font-size:13px;color:var(--ink-3)}

/* prose */
.prose{max-width:720px;font-size:18px;line-height:1.75;color:var(--ink)}
.prose p{margin:1.2em 0}
.prose h2{font-size:32px;font-weight:600;margin:1.4em 0 .6em;letter-spacing:-.02em}
.prose .lead{font-size:24px;line-height:1.5;color:var(--ink)}
.quote{border-left:3px solid var(--purple);padding:8px 0 8px 24px;font-size:24px;font-weight:600;line-height:1.4;margin:2em 0}
.tldr{background:var(--purple-soft);border-radius:var(--radius);padding:24px 28px;font-size:15px;line-height:1.7;margin:2em 0}
.tldr b{color:var(--purple)}

@media(max-width:900px){
  .genes{grid-template-columns:repeat(2,1fr)}
  .grid,.contact-grid{grid-template-columns:1fr}
  .prod{grid-template-columns:repeat(2,1fr)}
  .nav-links{display:none}
}
@media(max-width:560px){
  .genes{grid-template-columns:1fr}
  .prod{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}