/* TILNCE brand site — shared design system */
:root{
  --bg:#0a0d12;
  --bg-2:#0f141b;
  --panel:#12181f;
  --panel-2:#161d26;
  --line:#232c38;
  --line-soft:#1b232d;
  --ink:#eef3f8;
  --ink-2:#aeb9c6;
  --ink-3:#77828f;
  --accent:#1ec8d8;
  --accent-2:#12aebd;
  --accent-ink:#04222a;
  --charge:#4ade80;
  --danger:#ff6b6b;
  --radius:16px;
  --radius-sm:10px;
  --maxw:1200px;
  --shadow:0 20px 50px -20px rgba(0,0,0,.65);
  --font:"Inter","Helvetica Neue",Helvetica,Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);
  line-height:1.6;-webkit-font-smoothing:antialiased;font-size:16px;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.15;letter-spacing:-.01em;font-weight:800}
p{margin:0 0 1em}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.eyebrow{
  font-size:.72rem;font-weight:700;letter-spacing:.24em;text-transform:uppercase;
  color:var(--accent);margin:0 0 14px;display:block;
}
.muted{color:var(--ink-2)}
.section{padding:88px 0}
.section-tight{padding:56px 0}
.center{text-align:center}
.lead{font-size:1.12rem;color:var(--ink-2);max-width:640px}
.center .lead{margin-left:auto;margin-right:auto}

/* buttons */
.btn{
  display:inline-flex;align-items:center;gap:.5em;justify-content:center;
  padding:14px 28px;border-radius:999px;font-weight:700;font-size:.95rem;
  border:1px solid transparent;cursor:pointer;transition:.18s ease;white-space:nowrap;
}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:var(--accent-2);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-block{width:100%}
.btn-lg{padding:16px 34px;font-size:1rem}

/* header */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(10,13,18,.82);
  backdrop-filter:saturate(160%) blur(14px);border-bottom:1px solid var(--line-soft);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:1.15rem;letter-spacing:.14em}
.brand .logo{width:34px;height:34px;border-radius:8px;object-fit:cover}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{color:var(--ink-2);font-size:.92rem;font-weight:600;transition:.15s}
.nav-links a:hover{color:var(--ink)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-toggle{display:none;background:none;border:0;color:var(--ink);cursor:pointer;padding:6px}
.nav-toggle svg{width:26px;height:26px}

/* hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line-soft);
  background:radial-gradient(120% 90% at 78% 8%,rgba(30,200,216,.16),transparent 55%),var(--bg);}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;
  padding:96px 0 88px;}
.hero h1{font-size:clamp(2.5rem,5.4vw,4rem);line-height:1.04}
.hero .lead{margin-top:20px;font-size:1.18rem}
.hero-badge{display:inline-flex;align-items:center;gap:8px;font-size:.72rem;font-weight:700;
  letter-spacing:.22em;text-transform:uppercase;color:var(--ink-2);
  border:1px solid var(--line);border-radius:999px;padding:7px 16px;margin-bottom:22px}
.hero-badge .dot{width:7px;height:7px;border-radius:50%;background:var(--charge);box-shadow:0 0 10px var(--charge)}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.hero-media{position:relative}
.hero-media img{width:100%;border-radius:22px;border:1px solid var(--line);
  background:#fff;box-shadow:var(--shadow)}
.hero-stats{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap}
.hero-stat{flex:1;min-width:120px;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:14px 16px;background:var(--panel)}
.hero-stat b{display:block;font-size:1.28rem;color:var(--accent)}
.hero-stat span{font-size:.82rem;color:var(--ink-3)}

/* feature strip */
.strip{border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);
  background:var(--bg-2)}
.strip-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0}
.strip-item{padding:30px 26px;text-align:center;border-right:1px solid var(--line-soft)}
.strip-item:last-child{border-right:0}
.strip-item b{display:block;font-size:1.05rem;color:var(--ink)}
.strip-item span{font-size:.9rem;color:var(--ink-3)}

/* section header */
.sec-head{max-width:640px;margin:0 auto 52px;text-align:center}
.sec-head h2{font-size:clamp(1.9rem,3.6vw,2.6rem)}
.sec-head p{margin-top:14px;color:var(--ink-2);font-size:1.06rem}

/* product cards (collection) */
.prod-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.prod-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.prod-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:var(--shadow)}
.prod-card .ph{aspect-ratio:4/3;background:#fff;display:flex;align-items:center;justify-content:center;overflow:hidden}
.prod-card .ph img{width:100%;height:100%;object-fit:cover}
.prod-card .body{padding:26px;display:flex;flex-direction:column;flex:1}
.cap-tag{font-size:.74rem;font-weight:700;letter-spacing:.16em;color:var(--accent);text-transform:uppercase}
.prod-card h3{font-size:1.4rem;margin:8px 0 6px}
.prod-card .body p{color:var(--ink-2);flex:1}
.prod-card .price{font-size:1.2rem;font-weight:800;margin:6px 0 18px}
.prod-card .price s{color:var(--ink-3);font-weight:500;font-size:.9rem;margin-left:8px}

/* why grid */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.why-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px}
.why-card .ic{width:44px;height:44px;border-radius:11px;background:rgba(30,200,216,.12);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:var(--accent)}
.why-card .ic svg{width:24px;height:24px}
.why-card h3{font-size:1.12rem;margin-bottom:8px}
.why-card p{color:var(--ink-2);font-size:.94rem;margin:0}

/* use cases */
.use-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.use-card{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:3/4;
  border:1px solid var(--line)}
.use-card img{width:100%;height:100%;object-fit:cover;transition:.4s}
.use-card:hover img{transform:scale(1.05)}
.use-card .cap{position:absolute;inset:auto 0 0 0;padding:22px 20px;
  background:linear-gradient(to top,rgba(6,9,13,.92),transparent)}
.use-card .cap h3{font-size:1.16rem;margin-bottom:4px}
.use-card .cap p{font-size:.86rem;color:var(--ink-2);margin:0}

/* faq */
.faq{max-width:820px;margin:0 auto}
.faq details{border:1px solid var(--line);border-radius:var(--radius-sm);
  background:var(--panel);margin-bottom:14px;overflow:hidden}
.faq summary{cursor:pointer;padding:20px 24px;font-weight:700;font-size:1.02rem;
  list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.5rem;color:var(--accent);font-weight:400;transition:.2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details .ans{padding:0 24px 22px;color:var(--ink-2);font-size:.98rem}

/* match / cta band */
.band{background:linear-gradient(135deg,var(--panel-2),var(--bg-2));
  border:1px solid var(--line);border-radius:calc(var(--radius) + 6px);
  padding:56px 48px;text-align:center}
.band h2{font-size:clamp(1.7rem,3.2vw,2.3rem)}
.band .two{display:grid;grid-template-columns:1fr 1fr;gap:22px;max-width:640px;margin:32px auto 0}
.band .two .opt{border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:var(--bg)}
.band .two .opt b{display:block;font-size:1.5rem;color:var(--accent)}
.band .two .opt span{font-size:.9rem;color:var(--ink-2)}

/* ===== Product page ===== */
.pdp{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;padding:56px 0 40px;align-items:start}
.gallery .main{background:#fff;border-radius:var(--radius);border:1px solid var(--line);overflow:hidden;aspect-ratio:1/1}
.gallery .main img{width:100%;height:100%;object-fit:cover}
.thumbs{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin-top:12px}
.thumbs img{aspect-ratio:1/1;object-fit:cover;background:#fff;border-radius:9px;border:1px solid var(--line);
  cursor:pointer;transition:.15s;opacity:.7}
.thumbs img:hover,.thumbs img.active{opacity:1;border-color:var(--accent)}
.pdp-info h1{font-size:clamp(1.7rem,3vw,2.2rem);margin-bottom:10px}
.stars{color:#ffb020;letter-spacing:2px;font-size:1rem}
.rating-line{display:flex;align-items:center;gap:10px;color:var(--ink-3);font-size:.88rem;margin-bottom:18px}
.price-row{display:flex;align-items:baseline;gap:12px;margin:6px 0 6px}
.price-row .now{font-size:2rem;font-weight:800}
.price-row .was{color:var(--ink-3);text-decoration:line-through}
.ship-note{font-size:.88rem;color:var(--ink-2);margin-bottom:20px}
.ship-note b{color:var(--ink)}
.spec-list{list-style:none;padding:0;margin:22px 0;border-top:1px solid var(--line-soft)}
.spec-list li{display:flex;align-items:center;gap:12px;padding:13px 0;border-bottom:1px solid var(--line-soft);
  color:var(--ink-2);font-size:.96rem}
.spec-list li svg{width:20px;height:20px;color:var(--accent);flex:none}
.buy-actions{display:flex;flex-direction:column;gap:12px;margin-top:8px}
.trust-row{display:flex;gap:18px;margin-top:20px;flex-wrap:wrap;color:var(--ink-3);font-size:.82rem}
.trust-row span{display:flex;align-items:center;gap:7px}
.trust-row svg{width:16px;height:16px;color:var(--charge)}

/* detail images */
.detail-strip{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.detail-strip img{width:100%;border-radius:var(--radius);border:1px solid var(--line)}

/* reviews */
.rev-cols{columns:3;column-gap:22px}
.rev-card{break-inside:avoid;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:22px;margin-bottom:22px}
.rev-card .stars{font-size:.9rem;margin-bottom:10px}
.rev-card h4{font-size:1rem;margin-bottom:8px}
.rev-card p{color:var(--ink-2);font-size:.92rem;margin-bottom:14px}
.rev-card .who{font-size:.82rem;color:var(--ink-3)}
.rev-card .who b{color:var(--ink)}

/* about story */
.story-hero{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);margin-bottom:8px}
.story-hero img{width:100%;max-height:420px;object-fit:cover}
.chapter{display:grid;grid-template-columns:.35fr .65fr;gap:36px;padding:44px 0;border-bottom:1px solid var(--line-soft)}
.chapter:last-child{border-bottom:0}
.chapter .cno{font-size:.74rem;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--accent)}
.chapter h3{font-size:1.6rem;margin-top:8px}
.chapter .cbody p{color:var(--ink-2)}
.pill-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:16px}
.pill{border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 18px;background:var(--panel);flex:1;min-width:160px}
.pill b{display:block;color:var(--ink)}
.pill span{font-size:.86rem;color:var(--ink-3)}

/* contact / forms */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start}
.field{margin-bottom:18px}
.field label{display:block;font-size:.85rem;font-weight:600;color:var(--ink-2);margin-bottom:7px}
.field input,.field select,.field textarea{
  width:100%;background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius-sm);
  color:var(--ink);padding:13px 15px;font:inherit;font-size:.95rem;transition:.15s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent)}
.field textarea{min-height:130px;resize:vertical}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-note{font-size:.85rem;color:var(--ink-3);margin-top:6px}
.form-msg{margin-top:14px;font-size:.92rem;display:none}
.form-msg.ok{display:block;color:var(--charge)}
.form-msg.err{display:block;color:var(--danger)}
.contact-aside{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.contact-aside h3{font-size:1.2rem;margin-bottom:16px}
.contact-aside .row{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--line-soft)}
.contact-aside .row:last-child{border-bottom:0}
.contact-aside .row svg{width:20px;height:20px;color:var(--accent);flex:none;margin-top:2px}
.contact-aside .row b{display:block;font-size:.95rem}
.contact-aside .row span{font-size:.88rem;color:var(--ink-2)}

/* legal / prose */
.prose{max-width:820px;margin:0 auto}
.prose h2{font-size:1.4rem;margin:34px 0 12px}
.prose h3{font-size:1.1rem;margin:24px 0 8px}
.prose p,.prose li{color:var(--ink-2)}
.prose ul{padding-left:20px}
.prose li{margin-bottom:8px}
.page-head{padding:64px 0 8px;text-align:center;border-bottom:1px solid var(--line-soft)}
.page-head h1{font-size:clamp(2rem,4vw,2.8rem)}
.page-head p{color:var(--ink-2);margin-top:12px}
.breadcrumb{font-size:.82rem;color:var(--ink-3);margin-bottom:10px}
.breadcrumb a:hover{color:var(--accent)}

/* footer */
.site-footer{border-top:1px solid var(--line-soft);background:var(--bg-2);padding:64px 0 30px;margin-top:20px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px}
.foot-brand .brand{margin-bottom:14px}
.foot-brand p{color:var(--ink-2);font-size:.92rem;max-width:320px}
.foot-col h4{font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-3);margin-bottom:16px}
.foot-col a{display:block;color:var(--ink-2);font-size:.92rem;padding:6px 0;transition:.15s}
.foot-col a:hover{color:var(--accent)}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  margin-top:44px;padding-top:24px;border-top:1px solid var(--line-soft);color:var(--ink-3);font-size:.85rem}

/* responsive */
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;padding:64px 0}
  .hero-media{order:-1}
  .pdp{grid-template-columns:1fr;gap:32px}
  .why-grid,.use-grid{grid-template-columns:repeat(2,1fr)}
  .rev-cols{columns:2}
  .foot-grid{grid-template-columns:1fr 1fr}
  .form-grid{grid-template-columns:1fr}
  .chapter{grid-template-columns:1fr;gap:12px}
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;
    align-items:flex-start;background:var(--bg);border-bottom:1px solid var(--line);padding:16px 24px;gap:6px}
  .nav-links.open{display:flex}
  .nav-links a{padding:8px 0;width:100%}
  .nav-toggle{display:block}
  .strip-grid{grid-template-columns:1fr}
  .strip-item{border-right:0;border-bottom:1px solid var(--line-soft)}
  .band{padding:40px 24px}
  .band .two{grid-template-columns:1fr}
}
@media(max-width:560px){
  .prod-grid{grid-template-columns:1fr}
  .why-grid,.use-grid{grid-template-columns:1fr}
  .rev-cols{columns:1}
  .foot-grid{grid-template-columns:1fr}
  .section{padding:60px 0}
}