/* ============================================================
   Dr.SisLab — Warm premium FemTech + soft biotech + AI wellness
   ============================================================ */

:root{
  /* Base */
  --ivory:        #F6F1EA;
  --ivory-2:      #FBF7F1;
  --cream:        #FCFAF6;
  --ink:          #2C2420;
  --ink-soft:     #6A5F58;
  --ink-faint:    #9C9089;

  /* Accents */
  --rose:         #CC9A95;
  --rose-deep:    #B97F7E;
  --burgundy:     #7E3F50;
  --plum:         #9A7B98;
  --gold:         #C6A35E;
  --gold-deep:    #B08C45;

  /* Tech / data viz */
  --lavender:     #C9C4E4;
  --pale-blue:    #BBD0E2;
  --pearl:        #F3F0F7;

  --line:         rgba(44,36,32,.12);
  --line-soft:    rgba(44,36,32,.07);

  --serif: "Cormorant Garamond", Georgia, serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

  --ease: cubic-bezier(.22,.61,.36,1);
  --maxw: 1240px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:auto}
body{
  font-family:var(--sans);
  background:var(--ivory);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  line-height:1.5;
}
a{color:inherit;text-decoration:none}
em{font-style:italic}
::selection{background:var(--gold);color:#fff}

/* ---------- WebGL canvas + grain ---------- */
#webgl{
  position:fixed;inset:0;width:100vw;height:100vh;
  z-index:0;display:block;
}
.grain{
  position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.04;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
#scroll{position:relative;z-index:2}

/* ---------- Preloader ---------- */
.preloader{
  position:fixed;inset:0;z-index:100;background:var(--ivory);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:28px;
  transition:opacity .8s var(--ease),visibility .8s;
}
.preloader.done{opacity:0;visibility:hidden}
.preloader__mark{font-family:var(--serif);font-size:42px;letter-spacing:.5px}
.preloader__dr{color:var(--burgundy);font-weight:500}
.preloader__sis{color:var(--ink)}
.preloader__bar{width:160px;height:1.5px;background:var(--line);overflow:hidden}
.preloader__bar span{display:block;height:100%;width:0;background:var(--gold);animation:load 1.4s var(--ease) forwards}
@keyframes load{to{width:100%}}

/* ---------- Shared layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 40px;width:100%}
.center{text-align:center}
section{position:relative}

.eyebrow{
  font-size:12px;letter-spacing:.28em;text-transform:uppercase;
  color:var(--rose-deep);font-weight:500;margin-bottom:22px;
}
.eyebrow.center{display:block;text-align:center}
.section-title{
  font-family:var(--serif);font-weight:400;
  font-size:clamp(34px,5vw,62px);line-height:1.06;letter-spacing:-.01em;
  color:var(--ink);
}
.section-title.center{margin-inline:auto;max-width:16ch}
.section-lead{
  font-size:clamp(16px,1.4vw,19px);line-height:1.65;color:var(--ink-soft);
  max-width:54ch;margin-top:22px;font-weight:300;
}
.center .section-lead{margin-inline:auto}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:15px 30px;border-radius:100px;font-size:14px;font-weight:500;
  letter-spacing:.02em;transition:all .4s var(--ease);cursor:pointer;border:1px solid transparent;
}
.btn--gold{background:var(--gold);color:#fff;box-shadow:0 10px 30px -10px rgba(198,163,94,.7)}
.btn--gold:hover{background:var(--gold-deep);transform:translateY(-2px);box-shadow:0 16px 36px -12px rgba(198,163,94,.85)}
.btn--ghost{border-color:var(--line);color:var(--ink);background:rgba(255,255,255,.35);backdrop-filter:blur(6px)}
.btn--ghost:hover{border-color:var(--burgundy);color:var(--burgundy)}
.btn--full{width:100%;margin-top:8px}

/* ============================================================
   NAV
   ============================================================ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:26px 40px;transition:all .5s var(--ease);
}
.nav.solid{
  padding:16px 40px;background:rgba(246,241,234,.78);
  backdrop-filter:blur(18px) saturate(1.4);border-bottom:1px solid var(--line-soft);
}
.nav__brand{font-family:var(--serif);font-size:26px;letter-spacing:.3px}
.nav__dr{color:var(--burgundy);font-weight:500}
.nav__sis{color:var(--ink)}
.nav__links{display:flex;gap:38px}
.nav__links a{font-size:14px;font-weight:400;color:var(--ink-soft);position:relative;transition:color .3s}
.nav__links a::after{content:"";position:absolute;left:0;bottom:-5px;width:0;height:1px;background:var(--gold);transition:width .35s var(--ease)}
.nav__links a:hover{color:var(--ink)}
.nav__links a:hover::after{width:100%}
.nav__cta{
  font-size:13px;font-weight:500;padding:11px 22px;border-radius:100px;
  border:1px solid var(--line);color:var(--ink);transition:all .35s var(--ease);
}
.nav__cta:hover{background:var(--burgundy);color:#fff;border-color:var(--burgundy)}
.nav__burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer}
.nav__burger span{width:24px;height:1.5px;background:var(--ink);transition:.3s}

/* ============================================================
   1. HERO
   ============================================================ */
.hero{min-height:100vh;display:flex;align-items:center;position:relative}
.hero__inner{max-width:var(--maxw);margin:0 auto;padding:0 40px;width:100%}
.hero .eyebrow{margin-top:80px}
.hero__title{
  font-family:var(--serif);font-weight:300;
  font-size:clamp(44px,7.8vw,108px);line-height:1.0;letter-spacing:-.02em;color:var(--ink);
}
.hero__title .line{display:block;overflow:hidden}
.hero__title .line>span{display:block;transform:translateY(110%)}
.hero__title em{font-style:italic;color:var(--burgundy)}
.hero__sub{font-size:clamp(16px,1.5vw,20px);color:var(--ink-soft);max-width:50ch;margin-top:34px;font-weight:300;line-height:1.65}
.hero__cta{display:flex;gap:16px;margin-top:42px;flex-wrap:wrap}
.hero__scroll{position:absolute;bottom:38px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:12px}
.hero__scroll span{font-size:11px;letter-spacing:.25em;text-transform:uppercase;color:var(--ink-faint)}
.hero__scroll-line{width:1px;height:54px;background:var(--line);position:relative;overflow:hidden}
.hero__scroll-line i{position:absolute;top:0;left:0;width:100%;height:40%;background:var(--gold);animation:scrolldot 2.2s var(--ease) infinite}
@keyframes scrolldot{0%{transform:translateY(-100%)}100%{transform:translateY(250%)}}

/* ============================================================
   2. PROBLEM
   ============================================================ */
.problem{padding:160px 0 180px;background:linear-gradient(180deg,transparent,var(--ivory-2) 22%,var(--ivory-2))}
.problem .section-title{max-width:18ch}
.cards-float{position:relative;height:340px;margin-top:80px}
.fcard{
  position:absolute;display:inline-flex;align-items:center;gap:12px;
  padding:18px 30px;background:var(--cream);border:1px solid var(--line-soft);
  border-radius:100px;font-size:17px;font-family:var(--serif);color:var(--ink);
  box-shadow:0 24px 50px -28px rgba(126,63,80,.32);will-change:transform;
}
.fcard__dot{width:9px;height:9px;border-radius:50%;background:var(--rose)}
.fcard[data-float="1"]{top:20px;left:6%}
.fcard[data-float="2"]{top:120px;left:30%}
.fcard[data-float="3"]{top:30px;right:24%}
.fcard[data-float="4"]{top:160px;right:6%}
.fcard[data-float="5"]{top:240px;left:18%}
.fcard[data-float="2"] .fcard__dot{background:var(--burgundy)}
.fcard[data-float="3"] .fcard__dot{background:var(--plum)}
.fcard[data-float="4"] .fcard__dot{background:var(--gold)}
.fcard[data-float="5"] .fcard__dot{background:var(--rose-deep)}

/* ============================================================
   3. WHY MENSTRUAL BLOOD
   ============================================================ */
.why{padding:150px 0 170px;background:var(--ivory-2)}
.why__grid{display:grid;grid-template-columns:1fr .9fr;gap:90px;align-items:center}
.why__layers{position:relative;height:440px;display:flex;flex-direction:column;justify-content:center;gap:0}
.layer{
  position:relative;height:84px;border-radius:18px;margin:9px 0;
  display:flex;align-items:center;padding-left:34px;
  border:1px solid var(--line-soft);backdrop-filter:blur(4px);
  transform:translateX(40px);opacity:0;
}
.layer__tag{font-family:var(--serif);font-size:21px;color:var(--ink)}
.layer--sample{background:linear-gradient(100deg,rgba(204,154,149,.22),rgba(204,154,149,.05));margin-left:0;width:78%}
.layer--bio{background:linear-gradient(100deg,rgba(154,123,152,.22),rgba(154,123,152,.05));margin-left:8%;width:80%}
.layer--insight{background:linear-gradient(100deg,rgba(187,208,226,.28),rgba(187,208,226,.06));margin-left:16%;width:82%}
.layer--ai{background:linear-gradient(100deg,rgba(198,163,94,.26),rgba(198,163,94,.06));margin-left:24%;width:76%}
.why__flow{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:-1}
.why__flow path{fill:none;stroke:var(--gold);stroke-width:1;stroke-dasharray:6 8;opacity:.4}

/* ============================================================
   4. PLATFORM
   ============================================================ */
.platform{padding:160px 0 180px;background:linear-gradient(180deg,var(--ivory-2),var(--ivory))}
.plat__grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:70px}
.plat{
  background:var(--cream);border:1px solid var(--line-soft);border-radius:28px;
  padding:50px 46px;position:relative;overflow:hidden;transition:transform .5s var(--ease),box-shadow .5s var(--ease);
}
.plat::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--rose),var(--gold))}
.plat--deep::before{background:linear-gradient(90deg,var(--plum),var(--burgundy))}
.plat:hover{transform:translateY(-6px);box-shadow:0 40px 70px -40px rgba(126,63,80,.4)}
.plat__num{font-family:var(--serif);font-size:15px;color:var(--gold);letter-spacing:.1em}
.plat h3{font-family:var(--serif);font-size:34px;font-weight:500;margin-top:14px;color:var(--ink)}
.plat__sub{font-size:16px;color:var(--burgundy);margin-top:8px;font-weight:500}
.plat__body{font-size:15px;color:var(--ink-soft);margin-top:18px;line-height:1.65;font-weight:300}
.plat__list{list-style:none;margin-top:24px;display:flex;flex-direction:column;gap:12px}
.plat__list li{font-size:15px;color:var(--ink);padding-left:24px;position:relative}
.plat__list li::before{content:"";position:absolute;left:0;top:8px;width:8px;height:8px;border-radius:50%;border:1.5px solid var(--gold)}
.plat__tags{display:flex;gap:10px;margin-top:30px;flex-wrap:wrap}
.plat__tags span{font-size:12px;padding:7px 15px;border-radius:100px;background:var(--pearl);color:var(--ink-soft);letter-spacing:.02em}
.plat__path{text-align:center;margin-top:56px;font-family:var(--serif);font-size:clamp(20px,2.4vw,30px);color:var(--ink)}
.plat__path i{color:var(--gold);font-style:normal;margin:0 12px}

/* ============================================================
   5. HOW IT WORKS — pinned horizontal
   ============================================================ */
.how{background:var(--burgundy);color:var(--cream)}
.how__pin{height:100vh;display:flex;flex-direction:column;justify-content:center;overflow:hidden;position:relative}
.how__head{padding:0 40px;max-width:var(--maxw);margin:0 auto 50px;width:100%}
.how__head .eyebrow{color:var(--rose)}
.how__head .section-title{color:var(--cream);max-width:16ch}
.how__track{display:flex;gap:30px;padding:0 40px;will-change:transform}
.step{
  flex:0 0 clamp(300px,34vw,440px);
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);
  border-radius:24px;padding:48px 44px;backdrop-filter:blur(6px);
}
.step__n{font-family:var(--serif);font-size:54px;color:var(--gold);display:block;line-height:1}
.step h3{font-family:var(--serif);font-size:32px;font-weight:500;margin-top:18px}
.step p{font-size:16px;color:rgba(252,250,246,.7);margin-top:14px;line-height:1.6;font-weight:300}
.how__flow{
  text-align:center;margin-top:48px;font-size:14px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--rose);font-weight:400;
}

/* ============================================================
   6. AI COMPANION
   ============================================================ */
.ai{padding:170px 0 180px;background:linear-gradient(180deg,#fbf7f1,#f4eef6)}
.ai__grid{display:grid;grid-template-columns:1fr .8fr;gap:80px;align-items:center}
.ai__cols{display:grid;grid-template-columns:1fr 1fr;gap:36px;margin-top:40px}
.ai__cols h4{font-size:13px;text-transform:uppercase;letter-spacing:.15em;color:var(--plum);margin-bottom:16px}
.ai__cols ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.ai__cols li{font-size:15px;color:var(--ink-soft);padding-left:18px;position:relative}
.ai__cols li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--plum)}
.ai__line{margin-top:38px;font-family:var(--serif);font-size:clamp(22px,2.6vw,32px);color:var(--ink)}
.ai__line em{color:var(--plum)}

/* Phone mockup */
.ai__app{display:flex;justify-content:center}
.phone{
  width:300px;height:610px;background:#fff;border-radius:44px;padding:14px;position:relative;
  box-shadow:0 60px 100px -40px rgba(122,63,80,.45),0 0 0 1px rgba(44,36,32,.06);
}
.phone__notch{position:absolute;top:22px;left:50%;transform:translateX(-50%);width:90px;height:7px;border-radius:10px;background:#e8e1dc;z-index:3}
.phone__screen{
  height:100%;border-radius:32px;overflow:hidden;
  background:linear-gradient(180deg,#fdfbf8,#f6eef4);padding:46px 20px 22px;
  display:flex;flex-direction:column;gap:14px;
}
.app__top{display:flex;justify-content:space-between;align-items:center}
.app__hi{font-family:var(--serif);font-size:20px;color:var(--ink)}
.app__cycle{font-size:11px;color:var(--ink-faint);margin-top:3px}
.app__ring{position:relative;width:48px;height:48px}
.app__ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.app__ring circle{fill:none;stroke:#eadfe6;stroke-width:3}
.app__ring-fg{stroke:var(--gold)!important;stroke-dasharray:100;stroke-dashoffset:24;stroke-linecap:round}
.app__ring span{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;color:var(--burgundy)}
.app__card{background:#fff;border-radius:18px;padding:16px;box-shadow:0 12px 24px -16px rgba(122,63,80,.4)}
.app__label{font-size:11px;color:var(--ink-faint);letter-spacing:.04em}
.spark{width:100%;height:40px;margin-top:8px}
.spark polyline{fill:none;stroke:var(--plum);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.app__note{font-size:11px;color:var(--rose-deep);margin-top:6px}
.app__row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.app__mini{background:#fff;border-radius:16px;padding:14px;box-shadow:0 12px 24px -18px rgba(122,63,80,.4)}
.app__mini-k{font-size:11px;color:var(--ink-faint);display:block}
.app__mini-v{font-family:var(--serif);font-size:20px;color:var(--ink);margin-top:4px;display:block}
.app__chat{display:flex;flex-direction:column;gap:8px;margin-top:2px}
.bubble{font-size:12px;line-height:1.45;padding:11px 14px;border-radius:16px;max-width:88%}
.bubble--ai{background:#fff;color:var(--ink-soft);border-bottom-left-radius:4px;box-shadow:0 10px 20px -16px rgba(122,63,80,.5)}
.bubble--me{background:var(--burgundy);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}

/* ============================================================
   7. SCIENCE
   ============================================================ */
.science{padding:160px 0 180px;background:var(--ivory)}
.sci__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:70px}
.sci{padding:42px 30px;border-radius:22px;background:var(--cream);border:1px solid var(--line-soft);transition:transform .5s var(--ease)}
.sci:hover{transform:translateY(-6px)}
.sci__i{font-size:34px;color:var(--gold);display:block;line-height:1}
.sci h3{font-family:var(--serif);font-size:23px;font-weight:500;margin-top:22px;color:var(--ink)}
.sci p{font-size:14px;color:var(--ink-soft);margin-top:12px;line-height:1.6;font-weight:300}

/* ============================================================
   8. BRAND STORY
   ============================================================ */
.story{padding:170px 0 190px;background:linear-gradient(180deg,var(--ivory),var(--ivory-2))}
.story__grid{display:grid;grid-template-columns:.7fr 1.6fr .7fr;gap:50px;align-items:center}
.story__side{text-align:center;padding:46px 24px;border-radius:24px;border:1px solid var(--line-soft)}
.story__side--dr{background:linear-gradient(160deg,rgba(126,63,80,.08),transparent)}
.story__side--sis{background:linear-gradient(160deg,rgba(204,154,149,.14),transparent)}
.story__k{font-family:var(--serif);font-size:60px;display:block;line-height:1}
.story__side--dr .story__k{color:var(--burgundy)}
.story__side--sis .story__k{color:var(--rose-deep)}
.story__side h3{font-size:14px;letter-spacing:.18em;text-transform:uppercase;margin-top:18px;color:var(--ink)}
.story__side p{font-size:14px;color:var(--ink-soft);margin-top:10px;font-weight:300}
.story__center{text-align:center}
.story__center .section-title{margin-inline:auto}

/* ============================================================
   9. VISION
   ============================================================ */
.vision{padding:180px 0;background:var(--ivory-2);text-align:center}
.vision__title{
  font-family:var(--serif);font-weight:300;
  font-size:clamp(38px,6vw,82px);line-height:1.05;letter-spacing:-.015em;
  max-width:16ch;margin:0 auto;color:var(--ink);
}
.vision .section-lead{margin-top:34px}
.vision__key{
  margin:54px auto 0;max-width:30ch;font-family:var(--serif);
  font-size:clamp(22px,2.8vw,34px);line-height:1.3;color:var(--burgundy);font-style:italic;
}

/* ============================================================
   10. TRACTION
   ============================================================ */
.traction{padding:160px 0 180px;background:var(--ivory)}
.time{position:relative;margin-top:80px;display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.time__line{position:absolute;top:7px;left:5%;right:5%;height:1px;background:var(--line)}
.tnode{position:relative;padding-top:34px}
.tnode__dot{position:absolute;top:0;left:0;width:14px;height:14px;border-radius:50%;background:var(--ivory);border:2px solid var(--gold)}
.tnode:first-child .tnode__dot{background:var(--gold)}
.tnode h4{font-family:var(--serif);font-size:20px;font-weight:500;color:var(--ink)}
.tnode p{font-size:13px;color:var(--ink-faint);margin-top:8px}

/* ============================================================
   11. CONTACT
   ============================================================ */
.contact{padding:160px 0 140px;background:linear-gradient(180deg,var(--ivory),var(--ivory-2))}
.contact__grid{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:start}
.contact__copy .section-title{max-width:14ch}
.contact__brand{margin-top:60px;font-family:var(--serif);font-size:32px}
.contact__brand p{font-family:var(--sans);font-size:14px;color:var(--ink-soft);margin-top:12px;font-weight:300}
.contact__form{background:var(--cream);border:1px solid var(--line-soft);border-radius:28px;padding:44px}
.field{margin-bottom:22px}
.field label{display:block;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:10px}
.field input,.field textarea{
  width:100%;background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:14px 16px;font-family:var(--sans);font-size:15px;color:var(--ink);transition:border .3s;resize:none;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--gold)}
.chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{font-size:13px;padding:10px 18px;border-radius:100px;border:1px solid var(--line);background:#fff;color:var(--ink-soft);cursor:pointer;transition:all .3s}
.chip:hover,.chip.on{background:var(--burgundy);color:#fff;border-color:var(--burgundy)}

/* ============================================================
   FOOTER
   ============================================================ */
.footer{background:var(--ink);color:var(--ivory);padding:80px 0 40px}
.footer__grid{display:grid;grid-template-columns:1fr 1.4fr 1fr;gap:40px;align-items:center;padding-bottom:50px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer__brand{font-family:var(--serif);font-size:30px}
.footer__brand .nav__dr{color:var(--rose)}
.footer__brand .nav__sis{color:var(--ivory)}
.footer__nav{display:flex;gap:28px;justify-content:center;flex-wrap:wrap}
.footer__nav a{font-size:14px;color:rgba(246,241,234,.65);transition:color .3s}
.footer__nav a:hover{color:var(--gold)}
.footer__fine{font-size:13px;color:rgba(246,241,234,.45);text-align:right;line-height:1.6}
.footer__copy{text-align:center;font-size:12px;color:rgba(246,241,234,.4);margin-top:34px}

/* ---------- Form success / message states ---------- */
.form-msg{margin-top:16px;font-size:13px;text-align:center}
.form-msg[data-type="err"]{color:var(--burgundy)}
.form-msg[data-type="ok"]{color:var(--gold-deep)}
.form-done{text-align:center;padding:30px 10px}
.form-done__mark{width:64px;height:64px;border-radius:50%;background:var(--gold);color:#fff;font-size:30px;display:flex;align-items:center;justify-content:center;margin:0 auto 22px}
.form-done h3{font-family:var(--serif);font-size:30px;font-weight:500;color:var(--ink)}
.form-done p{font-size:15px;color:var(--ink-soft);margin-top:14px;line-height:1.7;font-weight:300}

/* ---------- Language toggle ---------- */
.nav__lang{display:flex;align-items:center;gap:2px;font-size:13px;margin-left:22px;border:1px solid var(--line);border-radius:100px;padding:4px;background:rgba(255,255,255,.4)}
.nav__lang button{background:none;border:none;cursor:pointer;font-family:var(--sans);font-size:12px;color:var(--ink-faint);padding:5px 11px;border-radius:100px;transition:all .3s var(--ease)}
.nav__lang button.on{background:var(--burgundy);color:#fff}
.nav__right{display:flex;align-items:center}

/* CJK typography when language = Chinese */
html[lang="zh"] body{font-family:"Noto Sans SC","Inter",sans-serif}
html[lang="zh"] .section-title,
html[lang="zh"] .hero__title,
html[lang="zh"] .vision__title,
html[lang="zh"] .sub-hero h1,
html[lang="zh"] .plat h3,html[lang="zh"] .sci h3,html[lang="zh"] .step h3,
html[lang="zh"] .nav__brand,html[lang="zh"] .footer__brand,
html[lang="zh"] .ai__line,html[lang="zh"] .plat__path,html[lang="zh"] .vision__key,
html[lang="zh"] .preloader__mark,html[lang="zh"] .story__k,
html[lang="zh"] .frow__t,html[lang="zh"] .fcell h3,html[lang="zh"] .cta-band h2,
html[lang="zh"] .form-done h3,html[lang="zh"] .fcard,html[lang="zh"] .layer__tag,
html[lang="zh"] .note-cols h4{
  font-family:"Noto Serif SC","Cormorant Garamond",serif;font-weight:500;letter-spacing:0;
}
html[lang="zh"] .hero__title,html[lang="zh"] .vision__title,html[lang="zh"] .sub-hero h1{font-weight:500;line-height:1.18}
html[lang="zh"] .section-title{line-height:1.25}
html[lang="zh"] .eyebrow{letter-spacing:.12em}

/* ============================================================
   Reveal animations (driven by JS / ScrollTrigger)
   ============================================================ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
.reveal.in{opacity:1;transform:none}
.split .word{display:inline-block;overflow:hidden;vertical-align:top}
.split .word>span{display:inline-block;transform:translateY(110%);transition:transform .9s var(--ease)}
.split.in .word>span{transform:none}

/* ============================================================
   Responsive
   ============================================================ */
@media(max-width:980px){
  .why__grid,.ai__grid,.contact__grid,.story__grid{grid-template-columns:1fr;gap:48px}
  .plat__grid{grid-template-columns:1fr}
  .sci__grid{grid-template-columns:1fr 1fr}
  .time{grid-template-columns:1fr 1fr;gap:40px 20px}
  .time__line{display:none}
  .story__grid{gap:24px}
  .footer__grid{grid-template-columns:1fr;text-align:center;gap:28px}
  .footer__fine{text-align:center}
  .footer__nav{justify-content:center}
}
@media(max-width:720px){
  .wrap,.hero__inner,.nav{padding-left:24px;padding-right:24px}
  .nav__links,.nav__cta{display:none}
  .nav__burger{display:flex}
  .nav__links.open{display:flex;position:fixed;inset:0;background:var(--ivory);flex-direction:column;align-items:center;justify-content:center;gap:32px;z-index:40}
  .nav__links.open a{font-family:var(--serif);font-size:28px;color:var(--ink)}
  .sci__grid{grid-template-columns:1fr}
  .cards-float{height:auto;display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
  .fcard{position:static!important}
  .how__head .section-title{font-size:30px}
  .step{flex-basis:78vw}
  .phone{transform:scale(.9)}
}
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001s!important;transition-duration:.001s!important}
  .reveal{opacity:1;transform:none}
  .split .word>span{transform:none}
}

/* ============================================================
   NEW DENSITY SECTIONS (shared by both themes)
   ============================================================ */
/* Signals / stat band — credibility, biotech-style numbers */
.signals{padding:130px 0;background:var(--ivory-2)}
.signals__head{display:flex;justify-content:space-between;align-items:flex-end;gap:40px;flex-wrap:wrap}
.signals__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:54px}
.stat{padding:38px 32px;border:1px solid var(--line-soft);border-radius:20px;background:var(--cream);transition:border-color .4s var(--ease),transform .4s var(--ease)}
.stat:hover{transform:translateY(-5px)}
.stat__n{font-family:var(--serif);font-weight:500;font-size:clamp(48px,5vw,74px);line-height:1;color:var(--ink)}
.stat__n em{font-style:normal;color:var(--gold);font-size:.5em;vertical-align:super;margin-left:2px}
.stat__hr{height:1px;background:var(--line);margin:22px 0}
.stat__t{font-size:16px;font-weight:600;color:var(--ink)}
.stat__d{font-size:13px;color:var(--ink-soft);margin-top:10px;line-height:1.6;font-weight:300}

/* FAQ accordion */
.faq{padding:150px 0;background:var(--ivory)}
.faq__grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:64px;align-items:start}
.faq__aside .section-title{max-width:14ch}
.faq__aside .section-lead{margin-top:20px}
.acc{border-top:1px solid var(--line)}
.acc__item{border-bottom:1px solid var(--line)}
.acc__q{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:26px 4px;cursor:pointer;font-family:var(--serif);font-size:clamp(19px,2vw,25px);font-weight:500;color:var(--ink);transition:color .3s}
.acc__q:hover{color:var(--burgundy)}
.acc__ico{flex:0 0 28px;width:28px;height:28px;border-radius:50%;border:1px solid var(--line);position:relative;transition:all .4s var(--ease)}
.acc__ico::before,.acc__ico::after{content:"";position:absolute;background:var(--ink);transition:transform .4s var(--ease)}
.acc__ico::before{top:50%;left:7px;right:7px;height:1.5px;transform:translateY(-50%)}
.acc__ico::after{left:50%;top:7px;bottom:7px;width:1.5px;transform:translateX(-50%)}
.acc__item.open .acc__ico{background:var(--ink);border-color:var(--ink)}
.acc__item.open .acc__ico::before,.acc__item.open .acc__ico::after{background:#fff}
.acc__item.open .acc__ico::after{transform:translateX(-50%) scaleY(0)}
.acc__a{max-height:0;overflow:hidden;transition:max-height .5s var(--ease)}
.acc__a p{padding:0 4px 28px;color:var(--ink-soft);font-size:15px;line-height:1.7;font-weight:300;max-width:60ch}

/* ============================================================
   VERSION SWITCHER WIDGET
   ============================================================ */
.vswitch{position:fixed;z-index:70;bottom:24px;left:50%;transform:translateX(-50%);
  display:flex;align-items:center;gap:6px;padding:7px 8px 7px 16px;border-radius:100px;
  background:rgba(255,255,255,.82);backdrop-filter:blur(18px) saturate(1.4);
  border:1px solid var(--line);box-shadow:0 16px 44px -18px rgba(40,30,30,.5)}
.vswitch__label{font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint);margin-right:4px;white-space:nowrap}
.vswitch button{border:none;background:none;cursor:pointer;font-family:var(--sans);font-size:13px;font-weight:500;color:var(--ink-soft);padding:9px 18px;border-radius:100px;transition:all .3s var(--ease);white-space:nowrap}
.vswitch button.on{background:var(--ink);color:#fff}
@media(max-width:560px){.vswitch__label{display:none}.vswitch button{padding:9px 14px;font-size:12px}}

/* ============================================================
   V2 — "STUDIO" THEME  (cool, dense, professional biotech)
   ============================================================ */
[data-theme="studio"]{
  --ivory:#E9EBEF; --ivory-2:#F1F3F6; --cream:#FFFFFF;
  --ink:#1B2230; --ink-soft:#586173; --ink-faint:#8C95A3;
  --rose:#9FB0C2; --rose-deep:#566273;
  --burgundy:#7E3F50;        /* single warm brand accent, used sparingly */
  --plum:#5E6A86;
  --gold:#28304a; --gold-deep:#161c2c;   /* CTA -> dark charcoal pill (reference) */
  --lavender:#D6DBE6; --pale-blue:#C7D4E3; --pearl:#EDF0F5;
  --line:rgba(27,34,48,.16); --line-soft:rgba(27,34,48,.08);
}
/* grotesk headings, tighter — the biotech feel */
[data-theme="studio"] .section-title,
[data-theme="studio"] .hero__title,
[data-theme="studio"] .vision__title,
[data-theme="studio"] .sub-hero h1,
[data-theme="studio"] .plat h3,[data-theme="studio"] .sci h3,[data-theme="studio"] .step h3,
[data-theme="studio"] .stat__n,[data-theme="studio"] .acc__q,
[data-theme="studio"] .frow__t,[data-theme="studio"] .fcell h3,[data-theme="studio"] .cta-band h2,
[data-theme="studio"] .ai__line,[data-theme="studio"] .vision__key,[data-theme="studio"] .plat__path,
[data-theme="studio"] .note-cols h4,[data-theme="studio"] .form-done h3{
  font-family:var(--sans);font-weight:600;letter-spacing:-.025em;font-style:normal;
}
[data-theme="studio"] .hero__title{font-weight:600;line-height:1.0;font-size:clamp(40px,6.4vw,90px)}
[data-theme="studio"] .section-title{font-size:clamp(28px,3.3vw,46px);line-height:1.12}
[data-theme="studio"] .vision__title{font-weight:600;font-size:clamp(34px,5vw,66px)}
[data-theme="studio"] .section-lead{font-size:16px;line-height:1.6}
[data-theme="studio"] em{font-style:normal;color:var(--burgundy)}
[data-theme="studio"] .vision__key{font-style:normal;color:var(--ink)}
[data-theme="studio"] .ai__line em,[data-theme="studio"] .hero__title em{color:var(--burgundy)}

/* eyebrow becomes a structured pill tag (like reference "About") */
[data-theme="studio"] .eyebrow{display:inline-block;border:1px solid var(--line);
  padding:7px 16px;border-radius:100px;color:var(--ink-soft);letter-spacing:.08em;margin-bottom:24px}
[data-theme="studio"] .eyebrow.center{display:inline-block}
[data-theme="studio"] .center .eyebrow,[data-theme="studio"] .vision .eyebrow{margin-inline:auto}

/* flat, bordered, squared cards (no soft shadows) */
[data-theme="studio"] .plat,[data-theme="studio"] .sci,[data-theme="studio"] .fcell,
[data-theme="studio"] .stat,[data-theme="studio"] .contact__form,[data-theme="studio"] .step,
[data-theme="studio"] .story__side,[data-theme="studio"] .phone{
  box-shadow:none!important;border:1px solid var(--line);border-radius:14px;background:var(--cream)}
[data-theme="studio"] .plat:hover,[data-theme="studio"] .sci:hover,[data-theme="studio"] .fcell:hover,
[data-theme="studio"] .stat:hover{transform:none;box-shadow:none;border-color:var(--ink)}
[data-theme="studio"] .plat::before{height:2px}
[data-theme="studio"] .btn{border-radius:9px}
[data-theme="studio"] .btn--gold{box-shadow:none}
[data-theme="studio"] .btn--gold:hover{transform:translateY(-1px);box-shadow:none}
[data-theme="studio"] .nav__cta{border-radius:9px}
[data-theme="studio"] .field input,[data-theme="studio"] .field textarea{border-radius:9px}
[data-theme="studio"] .chip,[data-theme="studio"] .plat__tags span,
[data-theme="studio"] .pill{border-radius:7px}

/* higher density — tighter vertical rhythm */
[data-theme="studio"] .problem,[data-theme="studio"] .platform,[data-theme="studio"] .science,
[data-theme="studio"] .traction,[data-theme="studio"] .signals{padding:96px 0}
[data-theme="studio"] .why,[data-theme="studio"] .ai,[data-theme="studio"] .story,
[data-theme="studio"] .faq{padding:104px 0}
[data-theme="studio"] .vision{padding:120px 0}
[data-theme="studio"] .contact{padding:104px 0 90px}
[data-theme="studio"] .plat{padding:38px 34px}
[data-theme="studio"] .sci{padding:34px 26px}
[data-theme="studio"] .plat__grid,[data-theme="studio"] .sci__grid,
[data-theme="studio"] .signals__grid{gap:18px}

/* cool backgrounds where literal warm colors were used */
[data-theme="studio"] .ai{background:linear-gradient(180deg,#F1F3F6,#E9EBEF)}
[data-theme="studio"] .how{background:#1B2230}
[data-theme="studio"] .footer{background:#11151D}
[data-theme="studio"] .sub-section--ink{background:#1B2230}
[data-theme="studio"] .phone__screen{background:linear-gradient(180deg,#fbfcfd,#eef1f5)}
[data-theme="studio"] .app__card,[data-theme="studio"] .app__mini,[data-theme="studio"] .bubble--ai{background:#fff}
[data-theme="studio"] .app__ring circle{stroke:#e3e8ef}
[data-theme="studio"] .spark polyline{stroke:var(--plum)}

/* nav frosted cool */
[data-theme="studio"] .nav.solid{background:rgba(233,235,239,.82)}
[data-theme="studio"] .vswitch{background:rgba(245,246,248,.86)}

/* numbers / accents pick up cool ink instead of gold */
[data-theme="studio"] .plat__num,[data-theme="studio"] .frow__n,[data-theme="studio"] .stat__n em,
[data-theme="studio"] .sci__i,[data-theme="studio"] .fcell__i{color:var(--burgundy)}
[data-theme="studio"] .how__flow{color:var(--rose)}

/* studio: How-it-works cards are white on the dark band — force dark text */
[data-theme="studio"] .step h3{color:var(--ink)}
[data-theme="studio"] .step p{color:var(--ink-soft)}
[data-theme="studio"] .step__n{color:var(--burgundy)}
/* studio: keep eyebrow pill visible on dark sections */
[data-theme="studio"] .how__head .eyebrow,
[data-theme="studio"] .sub-section--ink .eyebrow{border-color:rgba(255,255,255,.22)}