/* ============================================================
   ZISU'C — Static site design system
   ============================================================ */
:root{
  --paper:#faf8f4;
  --paper-alt:#f1ede5;
  --ink:#1a1917;
  --muted:#756f68;
  --accent:#00b9bf;
  --accent-deep:#067a7e;
  --accent-soft:#0c7377;
  --hairline:#e6e1d8;
  --dark:#15161a;
  --serif:"Playfair Display",Georgia,serif;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,sans-serif;
  --wrap:1220px;
  --gutter:clamp(20px,5vw,64px);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  line-height:1.7;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

.wrap{max-width:var(--wrap);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
.eyebrow{font-size:.72rem;font-weight:600;letter-spacing:.24em;text-transform:uppercase;color:var(--accent-soft)}
.serif{font-family:var(--serif)}

/* ---------- Info bar ---------- */
.topbar{background:var(--accent);color:#053b3d;overflow:hidden;white-space:nowrap;font-size:.72rem;letter-spacing:.2em;text-transform:uppercase}
.topbar__track{display:inline-flex;padding:9px 0;animation:marquee 34s linear infinite}
.topbar__track span{padding:0 2rem;font-weight:500}
.topbar__track span::after{content:"✦";margin-left:2rem;opacity:.55}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ---------- Header ---------- */
.header{position:sticky;top:0;z-index:60;background:rgba(250,248,244,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--hairline)}
.header__row{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:74px}
.nav{display:flex;gap:30px;align-items:center}
.nav a{font-size:.82rem;letter-spacing:.04em;color:var(--ink);position:relative;padding:4px 0}
.nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--ink);transition:width .3s ease}
.nav a:hover::after,.nav a[aria-current="page"]::after{width:100%}
.brand{font-family:var(--serif);font-size:1.65rem;font-weight:500;letter-spacing:.16em;text-align:center;white-space:nowrap}
.header__cta{display:flex;justify-content:flex-end}
.header__cta a{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;border:1px solid var(--ink);padding:10px 20px;transition:.28s}
.header__cta a:hover{background:var(--ink);color:#fff}
.burger{display:none;flex-direction:column;gap:5px;width:24px}
.burger span{height:1.5px;background:var(--ink);width:100%;transition:.3s}

.mnav{position:fixed;inset:0;background:var(--paper);z-index:70;transform:translateX(-100%);transition:transform .35s ease;display:flex;flex-direction:column;padding:28px var(--gutter)}
.mnav.open{transform:translateX(0)}
.mnav__top{display:flex;justify-content:space-between;align-items:center;margin-bottom:36px}
.mnav a{font-family:var(--serif);font-size:1.5rem;padding:14px 0;border-bottom:1px solid var(--hairline)}
.mnav__close{font-size:1.6rem;line-height:1}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;font-weight:500;padding:15px 30px;transition:.28s ease}
.btn--solid{background:#fff;color:var(--accent-deep)}
.btn--solid:hover{background:var(--accent);color:#fff}
.btn--ghost{border:1px solid rgba(255,255,255,.7);color:#fff}
.btn--ghost:hover{background:#fff;color:var(--accent-deep);border-color:#fff}
.btn--ink{background:var(--accent);color:#fff}
.btn--ink:hover{background:var(--accent-deep)}
.btn--line{border:1px solid var(--ink);color:var(--ink)}
.btn--line:hover{background:var(--ink);color:#fff}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:82vh;display:flex;align-items:flex-end;color:#fff;background:#2a2a2a}
.hero__bg{position:absolute;inset:0;background:url('https://zisuc.us/cdn/shop/files/main_model01.jpg?v=1771357242&width=1800') center/cover no-repeat}
.hero__scrim{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,12,20,.15) 0%,rgba(10,12,20,0) 40%,rgba(10,12,20,.65) 100%)}
.hero__inner{position:relative;z-index:2;padding-bottom:clamp(48px,8vh,96px);padding-top:120px;max-width:640px}
.hero .eyebrow{color:rgba(255,255,255,.85);margin-bottom:22px}
.hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(2.7rem,6.2vw,5.1rem);line-height:1.04;letter-spacing:-.5px;margin-bottom:22px}
.hero p{font-size:1.05rem;color:rgba(255,255,255,.9);max-width:440px;margin-bottom:34px;font-weight:300}
.hero__cta{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- Page header (interior pages) ---------- */
.phead{padding:clamp(120px,16vh,180px) 0 clamp(40px,6vw,64px);border-bottom:1px solid var(--hairline);text-align:center}
.phead .eyebrow{display:block;margin-bottom:16px}
.phead h1{font-family:var(--serif);font-weight:500;font-size:clamp(2.2rem,5vw,3.6rem);line-height:1.08;letter-spacing:-.4px}
.phead p{color:var(--muted);max-width:560px;margin:18px auto 0;font-size:1.04rem}

/* ---------- Breadcrumb ---------- */
.crumb{font-size:.76rem;letter-spacing:.06em;color:var(--muted);padding:22px 0}
.crumb a:hover{color:var(--ink)}
.crumb span{margin:0 8px;opacity:.5}

/* ---------- Trust strip ---------- */
.trust{border-bottom:1px solid var(--hairline);background:var(--paper)}
.trust__row{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 40px;padding:20px 0;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.trust__row span{display:inline-flex;align-items:center;gap:9px}
.trust__row span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent-soft)}

/* ---------- Section shell ---------- */
.section{padding:clamp(64px,9vw,120px) 0}
.section--alt{background:var(--paper-alt)}
.shead{max-width:640px}
.shead .eyebrow{display:block;margin-bottom:16px}
.shead h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.9rem,3.6vw,3.05rem);line-height:1.12;letter-spacing:-.4px}
.shead--center{margin:0 auto 44px;text-align:center}

/* ---------- Split (image + text) ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,72px);align-items:center}
.split--rev .split__media{order:2}
.split__media{position:relative;aspect-ratio:4/5;overflow:hidden;background:var(--paper-alt)}
.split__media img{width:100%;height:100%;object-fit:cover}
.split__body .eyebrow{display:block;margin-bottom:16px}
.split__body h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.8rem,3.2vw,2.7rem);line-height:1.14;margin-bottom:22px;letter-spacing:-.3px}
.split__body p{color:var(--muted);margin-bottom:16px;font-size:1.02rem}
.split__body p:last-child{margin-bottom:0}
.split__tag{font-family:var(--serif);font-style:italic;color:var(--ink);font-size:1.2rem;line-height:1.5;margin-top:26px}

/* ---------- Product grid + cards (info only) ---------- */
.prods__head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:clamp(34px,4vw,52px)}
.prods__head a.viewall{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;border-bottom:1px solid var(--ink);padding-bottom:3px;white-space:nowrap}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(16px,2.2vw,30px)}
.card{display:flex;flex-direction:column;color:inherit}
.card__media{position:relative;aspect-ratio:1/1;background:#fff;overflow:hidden;border:1px solid var(--hairline)}
.card__media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:opacity .5s ease}
.card__media img.alt{opacity:0}
.card:hover .card__media img.alt{opacity:1}
.card:hover .card__media img.main{opacity:0}
.card__brand{font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:14px;margin-bottom:3px}
.card__name{font-size:.95rem;font-weight:500;margin:0 0 8px;line-height:1.4}
.card__desc{font-size:.85rem;color:var(--muted);margin-bottom:12px}
.card__price{font-size:.98rem;font-weight:600;color:var(--accent-deep);margin-bottom:10px}
.card__cta{font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-deep);display:inline-flex;align-items:center;gap:7px;margin-top:auto}
.card__cta::after{content:"→";transition:transform .3s ease}
.card:hover .card__cta::after{transform:translateX(4px)}

/* ---------- Full-bleed image band ---------- */
.band img{width:100%;height:auto}

/* ---------- Technology columns ---------- */
.tech__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:clamp(36px,4vw,56px);border-top:1px solid var(--hairline)}
.tech__item{padding:30px clamp(14px,2vw,28px) 30px 0;border-right:1px solid var(--hairline)}
.tech__item:last-child{border-right:none;padding-right:0}
.tech__item h3{font-size:.86rem;letter-spacing:.2em;text-transform:uppercase;font-weight:600;margin-bottom:14px;color:var(--accent-deep)}
.tech__item p{color:var(--muted);font-size:.95rem}
.tech__num{font-family:var(--serif);font-style:italic;color:var(--accent-soft);font-size:1.05rem;margin-bottom:12px;display:block}

/* ---------- Philosophy ---------- */
.philo{text-align:center;max-width:820px;margin:0 auto}
.philo .eyebrow{display:block;margin-bottom:20px}
.philo h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.7rem,3vw,2.5rem);line-height:1.3;margin-bottom:30px;letter-spacing:-.3px}
.philo p{color:var(--muted);font-size:1.04rem;margin-bottom:18px}
.philo p:last-child{margin-bottom:0}

/* ---------- Certifications ---------- */
.certs{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--hairline);border:1px solid var(--hairline);margin-top:clamp(36px,4vw,52px)}
.cert{background:var(--paper);padding:30px 26px}
.cert h4{font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-deep);margin-bottom:10px}
.cert p{font-size:.92rem;color:var(--muted)}

/* ---------- Product detail (PDP) ---------- */
.pdp{display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(32px,5vw,72px);align-items:start}
.pdp__gallery{position:sticky;top:100px}
.pdp__main{aspect-ratio:1/1;background:#fff;border:1px solid var(--hairline);overflow:hidden}
.pdp__main img{width:100%;height:100%;object-fit:cover}
.pdp__thumbs{display:flex;gap:12px;margin-top:12px}
.pdp__thumbs button{width:88px;height:88px;background:#fff;border:1px solid var(--hairline);overflow:hidden;padding:0}
.pdp__thumbs button.active{border-color:var(--accent-deep)}
.pdp__thumbs img{width:100%;height:100%;object-fit:cover}
.pdp__info .eyebrow{display:block;margin-bottom:14px}
.pdp__info h1{font-family:var(--serif);font-weight:500;font-size:clamp(2rem,3.6vw,2.9rem);line-height:1.1;margin-bottom:18px;letter-spacing:-.3px}
.pdp__lead{font-size:1.06rem;color:var(--muted);margin-bottom:26px}
.pdp__benefits{list-style:none;margin:0 0 30px}
.pdp__benefits li{padding:11px 0 11px 26px;border-bottom:1px solid var(--hairline);position:relative;font-size:.98rem}
.pdp__benefits li::before{content:"";position:absolute;left:0;top:18px;width:7px;height:7px;border-radius:50%;background:var(--accent)}
.pdp__meta{display:flex;gap:30px;flex-wrap:wrap;font-size:.9rem;color:var(--muted);margin-bottom:30px}
.pdp__meta b{display:block;color:var(--ink);font-weight:500;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:4px}
.pdp__price{font-family:var(--serif);font-size:1.7rem;font-weight:500;color:var(--accent-deep);margin:2px 0 20px}
.ingr-list{list-style:none;margin-top:4px}
.ingr-list li{padding:12px 0;border-bottom:1px solid var(--hairline);font-size:.98rem;color:var(--muted)}
.ingr-list li:last-child{border-bottom:none}
.ingr-list b{color:var(--ink);font-weight:500}
.pdp__certs{margin-top:24px;padding-top:24px;border-top:1px solid var(--hairline);font-size:.85rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:8px 24px}
.pdp__certs span{display:inline-flex;align-items:center;gap:7px}
.pdp__certs span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent-soft)}

.pdp__detail{max-width:760px;margin:clamp(56px,7vw,90px) auto 0}
.pdp__block{padding:34px 0;border-top:1px solid var(--hairline)}
.pdp__block h3{font-family:var(--serif);font-weight:500;font-size:1.4rem;margin-bottom:16px}
.pdp__block p{color:var(--muted);margin-bottom:14px}
.pdp__block p:last-child{margin-bottom:0}

/* ---------- Placeholder highlight ---------- */
.ph{color:var(--accent-deep);font-style:italic;background:rgba(0,185,191,.08);padding:1px 5px;border-radius:3px}

/* ---------- CTA band ---------- */
.ctaband{background:var(--paper-alt);text-align:center}
.ctaband .eyebrow{display:block;margin-bottom:16px}
.ctaband h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.7rem,3vw,2.4rem);margin-bottom:14px}
.ctaband p{color:var(--muted);max-width:480px;margin:0 auto 30px}

/* ---------- Contact ---------- */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,72px);align-items:start}
.contact__list{list-style:none}
.contact__list li{padding:22px 0;border-bottom:1px solid var(--hairline)}
.contact__list h4{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-deep);margin-bottom:8px}
.contact__list p{color:var(--muted);font-size:1rem}
.contact__list p a{color:var(--accent-deep);font-weight:500}
.contact__list p a:hover{text-decoration:underline}
.form{display:flex;flex-direction:column;gap:16px}
.form label{font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:6px;display:block}
.form input,.form textarea{width:100%;border:1px solid var(--hairline);background:#fff;padding:13px 15px;font-family:inherit;font-size:.98rem;color:var(--ink)}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--accent-deep)}
.form textarea{resize:vertical;min-height:130px}

/* ---------- FAQ ---------- */
.faq{max-width:840px;margin:0 auto}
.faq__item{border-bottom:1px solid var(--hairline)}
.faq__q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:24px;text-align:left;padding:24px 0;font-size:1.02rem;font-weight:500;color:var(--ink)}
.faq__q .ic{flex-shrink:0;width:22px;height:22px;position:relative;transition:transform .3s ease}
.faq__q .ic::before,.faq__q .ic::after{content:"";position:absolute;background:var(--accent);left:50%;top:50%;transform:translate(-50%,-50%)}
.faq__q .ic::before{width:14px;height:1.5px}
.faq__q .ic::after{width:1.5px;height:14px;transition:transform .3s ease}
.faq__item.open .ic::after{transform:translate(-50%,-50%) scaleY(0)}
.faq__a{max-height:0;overflow:hidden;transition:max-height .4s ease}
.faq__a p{color:var(--muted);font-size:.98rem;padding:0 0 26px}

/* ---------- Footer ---------- */
.footer{background:var(--dark);color:#c9c6c0;padding:clamp(56px,7vw,88px) 0 30px}
.footer__grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:clamp(30px,5vw,70px)}
.footer__logo{height:38px;width:auto;margin-bottom:22px}
.footer__intro{font-size:.95rem;color:#9a968f;max-width:340px;margin-bottom:24px}
.footer__social{display:flex;gap:16px;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase}
.footer__social a{color:#c9c6c0}
.footer__social a:hover{color:#fff}
.footer h4{font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;color:#fff;margin-bottom:20px;font-weight:600}
.footer ul{list-style:none}
.footer li{margin-bottom:12px}
.footer li a,.footer li span{font-size:.9rem;color:#9a968f}
.footer li a:hover{color:#fff}
.footer__bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:clamp(40px,5vw,64px);padding-top:26px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.8rem;color:#7d7a74}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .nav{display:none}
  .burger{display:flex}
  .header__row{grid-template-columns:auto 1fr auto}
  .brand{text-align:left;padding-left:14px}
  .header__cta{display:none}
  .split{grid-template-columns:1fr;gap:28px}
  .split--rev .split__media{order:0}
  .grid{grid-template-columns:repeat(2,1fr)}
  .tech__grid{grid-template-columns:1fr 1fr}
  .tech__item{border-right:none;padding:24px 0;border-bottom:1px solid var(--hairline)}
  .tech__item:nth-child(odd){padding-right:20px;border-right:1px solid var(--hairline)}
  .certs{grid-template-columns:1fr 1fr}
  .pdp{grid-template-columns:1fr;gap:28px}
  .pdp__gallery{position:static}
  .contact{grid-template-columns:1fr;gap:36px}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__brandcol{grid-column:1/-1}
}
@media(max-width:560px){
  .grid{grid-template-columns:1fr 1fr;gap:14px}
  .tech__grid,.certs{grid-template-columns:1fr}
  .tech__item,.tech__item:nth-child(odd){border-right:none;padding-right:0}
  .footer__grid{grid-template-columns:1fr}
  .hero{min-height:78vh}
  .phead{padding-top:110px}
}
@media(prefers-reduced-motion:reduce){
  .topbar__track{animation:none}
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}