:root{
  --bone:#F6F3EC; --ink:#12141A; --ink2:#181B23;
  --tx:#14161C; --tx60:rgba(20,22,28,.62);
  --bn:#F3F0E8; --bn60:rgba(243,240,232,.62);
  --sig:#FF4D12; --sigd:#E23F07; --pur:#8A4FFF;
  --rule-l:rgba(20,22,28,.35); --rule-d:rgba(243,240,232,.35);
  --hair-l:rgba(20,22,28,.14); --hair-d:rgba(243,240,232,.16);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:#F6F3EC linear-gradient(180deg,#F8F5EF 0%,#F5F0E7 26%,#F2ECE1 52%,#F5EFE6 74%,#F0E8DB 100%) fixed;color:var(--tx);font-family:'Archivo',system-ui,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--sig);outline-offset:3px}
.wrap{max-width:1440px;margin:0 auto;padding:0 clamp(22px,3.4vw,56px)}
section{position:relative}

/* header */
.hd{position:fixed;top:0;left:0;right:0;z-index:100;pointer-events:none}
.hd .wrap{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:88px}
.hd a,.hd button{pointer-events:auto}
.lg{position:relative;width:56px;height:56px;display:block}
.lg img{position:absolute;left:0;top:0;height:56px;width:auto;transition:opacity .35s ease}
.lg .md{opacity:0}
.hd.inv .lg .ml{opacity:0}
.hd.inv .lg .md{opacity:1}
.hd .wm{justify-self:center;font-size:19px;font-weight:500;color:var(--tx);transition:color .35s ease;position:relative}
.hd .wm::before{content:"";position:absolute;right:calc(100% + 26px);top:50%;width:16vw;max-width:260px;height:1px;background:var(--hair-l);transition:background .35s ease}
.hd.inv .wm{color:var(--bn)}
.hd.inv .wm::before{background:var(--hair-d)}
.hd .lg,.hd .wm{transition:opacity .35s ease,transform .35s ease}
.hd.hide .lg,.hd.hide .wm{opacity:0;transform:translateY(-14px);pointer-events:none}
.hd.hide .bg{opacity:.25}
.hd.hide .bg:hover,.hd.hide .bg:focus-visible{opacity:1}
.bg{justify-self:end;background:none;border:0;border-radius:0;-webkit-appearance:none;appearance:none;box-shadow:none;cursor:pointer;padding:13px 5px 13px 17px;display:flex;flex-direction:column;align-items:flex-end;gap:5px;transition:opacity .35s ease}
.bg i{display:block;height:4px;border-radius:99px;background:var(--tx);transition:background .35s ease}
.bg i:nth-child(1){width:26px}.bg i:nth-child(2){width:18px}.bg i:nth-child(3){width:10px}
.hd.inv .bg i{background:var(--bn)}

/* menu */
.mroot{position:fixed;inset:0;z-index:200;visibility:hidden;pointer-events:none}
.mroot.open{visibility:visible;pointer-events:auto}
.mback{position:absolute;inset:0;background:rgba(10,12,16,.45);backdrop-filter:blur(9px);-webkit-backdrop-filter:blur(9px);opacity:0;transition:opacity .35s ease}
.mroot.open .mback{opacity:1}
.menu{position:absolute;top:0;right:0;bottom:0;width:min(430px,94vw);background:#FBF9F3;padding:26px 40px 36px;display:flex;flex-direction:column;transform:translateX(103%);transition:transform .5s cubic-bezier(.6,0,.2,1);box-shadow:-30px 0 90px rgba(10,12,16,.28)}
.mroot.open .menu{transform:none}
.mx{align-self:flex-end;background:none;border:0;color:var(--tx);width:42px;height:42px;cursor:pointer;font-size:20px}
.mx:hover{color:var(--sig)}
.menu nav{margin:auto 0;display:flex;flex-direction:column;gap:15px;align-items:flex-start}
.menu nav a{display:inline-block;font-size:clamp(20px,1.9vw,25px);padding-bottom:2px;transform-origin:left center;transition:transform .3s cubic-bezier(.2,.7,.3,1),color .25s ease}
.menu nav a:hover{transform:scale(1.09);color:var(--sig)}
.menu nav a.on{border-bottom:1.5px solid var(--tx)}
.menu .mc{display:flex;flex-direction:column;gap:16px;font-size:14px;line-height:1.45}
.menu .mc i{font-style:normal;display:block;color:var(--tx60);font-size:12.5px;margin-bottom:3px}
.menu .mc a{border-bottom:1px solid var(--tx);width:fit-content}

/* grammar */
.rail{display:inline-block}
.rail::before{content:"";display:block;width:min(190px,17vw);height:3px;border-radius:99px;background:var(--sig);margin-bottom:14px}
.rail span{font-size:clamp(17px,1.6vw,23px);font-weight:500;letter-spacing:.005em;line-height:1.25}
.rail{margin-bottom:20px}
.sqbtn{display:inline-flex;align-items:center;gap:16px;font-size:clamp(18px,1.7vw,23px);border:1px solid var(--rule-l);padding:22px 28px;border-radius:2px;transition:background .25s ease,color .25s ease,border-color .25s ease;background:none;cursor:pointer;font-family:inherit;color:inherit}
.sqbtn:hover{background:var(--ink);color:var(--bn);border-color:var(--ink)}
.sqbtn b{font-weight:600;font-size:.66em;width:1.8em;height:1.8em;border:1.5px solid var(--pur);border-radius:50%;display:inline-flex;align-items:center;justify-content:center;line-height:0;padding-bottom:.06em;transition:background .25s ease,color .25s ease,border-color .25s ease}
.sqbtn:hover b{background:var(--pur);border-color:var(--pur);color:#fff}
.sqbtn.solid{background:var(--ink);color:var(--bn);border-color:var(--ink)}
.sqbtn.solid:hover{background:var(--sig);border-color:var(--sig);color:#fff}
.rv{opacity:1;transform:none}

/* hero */
.hero{padding:126px 0 96px}
.hgrid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(36px,5vw,88px);align-items:center}
h1{font-weight:600;font-size:clamp(46px,6.4vw,104px);line-height:.9;letter-spacing:-.03em;text-transform:uppercase;margin:24px 0 0}
h1 em{font-style:normal;color:var(--sig)}
.sub{margin-top:26px;font-size:clamp(19px,1.9vw,26px);line-height:1.42;font-weight:300;max-width:560px}
.body2{margin-top:22px;font-size:17px;line-height:1.65;color:var(--tx60);max-width:560px}
.rel{margin-top:30px;display:inline-flex;align-items:center;gap:12px;font-size:14px;font-weight:500;letter-spacing:.04em}
.rel::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--sig)}

/* capture */
.cap{margin-top:36px;max-width:560px}
.cap label{display:block;font-size:12px;letter-spacing:.14em;font-weight:600;color:var(--tx60);margin-bottom:10px}
.crow{display:flex;gap:12px;flex-wrap:wrap}
.cap input{flex:1 1 250px;font-family:inherit;font-size:17px;padding:20px;border:1px solid var(--rule-l);border-radius:2px;background:rgba(255,255,255,.55);color:var(--tx)}
.cap input:focus{outline:2px solid var(--sig);outline-offset:1px;background:#fff}
.cap .fine{margin-top:14px;font-size:13px;color:var(--tx60)}
.ok{display:none;border-left:3px solid var(--sig);background:rgba(255,77,18,.07);padding:22px 24px;border-radius:2px;font-size:17px;line-height:1.6;max-width:560px;margin-top:36px}
.ok.show{display:block}
.ok b{font-weight:600}

/* ============ 360 BOOK ============ */
.bookstage{--bw:clamp(214px,20vw,310px);--bh:calc(var(--bw)*1.5);--bd:46px;
display:flex;align-items:center;justify-content:center;perspective:2000px;min-height:min(640px,72vh);touch-action:pan-y;cursor:grab}
.bookstage:active{cursor:grabbing}
.bk{position:relative;width:var(--bw);height:var(--bh);transform-style:preserve-3d;
transform:rotateX(5deg) rotateY(var(--ry,-24deg));will-change:transform}
.fc{position:absolute;left:50%;top:50%;overflow:hidden}
.f-front,.f-back{width:var(--bw);height:var(--bh);margin-left:calc(var(--bw)/-2);margin-top:calc(var(--bh)/-2)}
.f-front{transform:translateZ(calc(var(--bd)/2));background:linear-gradient(168deg,#FBF8F1 0%,#F2EBDD 60%,#EDE3D1 100%);
border-radius:2px 5px 5px 2px;box-shadow:inset 0 0 0 1px rgba(20,22,28,.10),0 44px 90px -34px rgba(18,20,26,.5);
display:flex;flex-direction:column;padding:9% 8.5% 7.5%}
.f-back{transform:rotateY(180deg) translateZ(calc(var(--bd)/2));background:linear-gradient(168deg,#F5F0E6,#EBE2D2);
border-radius:5px 2px 2px 5px;box-shadow:inset 0 0 0 1px rgba(20,22,28,.10);display:flex;flex-direction:column;padding:11% 9% 8%}
.f-spine,.f-edge{width:var(--bd);height:var(--bh);margin-left:calc(var(--bd)/-2);margin-top:calc(var(--bh)/-2)}
.f-spine{transform:rotateY(-90deg) translateZ(calc(var(--bw)/2));background:linear-gradient(90deg,#0E1015,#1A1E28 42%,#0C0E12);
display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:16px 0}
.f-edge{transform:rotateY(90deg) translateZ(calc(var(--bw)/2));
background:repeating-linear-gradient(0deg,#EFE8DA 0 2px,#E2D9C6 2px 4px)}
.f-top,.f-bot{width:var(--bw);height:var(--bd);margin-left:calc(var(--bw)/-2);margin-top:calc(var(--bd)/-2);
background:repeating-linear-gradient(90deg,#F1EADC 0 2px,#E4DBC8 2px 4px)}
.f-top{transform:rotateX(90deg) translateZ(calc(var(--bh)/2))}
.f-bot{transform:rotateX(-90deg) translateZ(calc(var(--bh)/2))}

/* front cover composition */
.c-top{display:flex;align-items:center;justify-content:space-between;font-size:clamp(6px,.62vw,8.5px);letter-spacing:.2em;font-weight:600;color:rgba(20,22,28,.5)}
.c-title{margin-top:5%;font-weight:600;font-size:clamp(31px,3.5vw,50px);line-height:.86;letter-spacing:-.035em;color:var(--ink);text-transform:uppercase}
.c-title em{font-style:normal;color:var(--sig)}
.c-rule{width:38%;height:4px;border-radius:99px;background:var(--sig);margin-top:5%}
.c-art{flex:1;display:flex;align-items:flex-end;justify-content:center;margin:2% -4% 0;min-height:0}
.c-art svg{width:100%;height:auto}
.c-sub{font-size:clamp(7.5px,.78vw,10.5px);line-height:1.5;color:rgba(20,22,28,.72);font-weight:500;margin-top:4%}
.c-auth{margin-top:4%;font-size:clamp(8px,.82vw,11px);font-weight:600;letter-spacing:.16em;color:var(--ink)}
.c-spec{position:absolute;left:0;right:0;bottom:0;height:5px;background:linear-gradient(90deg,#FFB27A,#FF4D12 34%,#FF3D8F 66%,#7A3BFF)}

/* back cover */
.b-quote{font-weight:300;font-size:clamp(9px,.95vw,13px);line-height:1.42;color:var(--ink)}
.b-body{margin-top:6%;font-size:clamp(6.6px,.66vw,8.8px);line-height:1.62;color:rgba(20,22,28,.66)}
.b-foot{margin-top:auto;display:flex;align-items:flex-end;justify-content:space-between;gap:8px}
.b-foot img{width:clamp(16px,1.7vw,24px)}
.barcode{background:#fff;padding:4px 5px 3px;border-radius:1px;display:flex;flex-direction:column;align-items:center;gap:2px}
.barcode span{display:block;height:clamp(12px,1.3vw,18px);width:clamp(36px,3.8vw,52px);
background:repeating-linear-gradient(90deg,#12141A 0 1px,transparent 1px 2px,#12141A 2px 4px,transparent 4px 5px)}
.barcode i{font-style:normal;font-size:4.5px;letter-spacing:.06em;color:#12141A}
.sp-mark{width:20px;opacity:.9}
.sp-txt{writing-mode:vertical-rl;font-size:clamp(7px,.7vw,9.5px);letter-spacing:.2em;font-weight:600;color:var(--bn);white-space:nowrap}
.sp-txt em{font-style:normal;color:var(--sig)}
.bhint{margin-top:20px;text-align:center;font-size:12px;letter-spacing:.14em;color:var(--tx60)}

/* sections */
.sect{padding:clamp(90px,11vh,150px) 0}
h2{font-weight:300;font-size:clamp(32px,4.6vw,66px);line-height:1.04;letter-spacing:-.018em;max-width:1100px}
.lede{font-size:17.5px;line-height:1.66;color:var(--tx60);max-width:720px;margin-top:22px}
.blurb{margin-top:56px;max-width:900px}
.blurb p{font-weight:300;font-size:clamp(19px,1.9vw,25px);line-height:1.56}
.blurb p+p{margin-top:26px}
.blurb .kick{font-weight:400;color:var(--tx)}
.blurb .quiet{color:var(--tx60)}
.types{display:grid;grid-template-columns:repeat(4,1fr);margin-top:64px;border-top:1px solid var(--rule-l)}
.type{padding:34px 28px 40px 28px;border-right:1px solid var(--hair-l)}
.type:first-child{padding-left:0}
.type:last-child{border-right:0}
.type .n{font-size:13px;font-weight:600;letter-spacing:.16em;color:var(--sig)}
.type h3{font-weight:300;font-size:clamp(23px,2.05vw,29px);line-height:1.12;margin:14px 0 12px;letter-spacing:-.01em;min-height:1.12em}
.type p{font-size:15px;line-height:1.6;color:var(--tx60)}
.learn{margin-top:56px;max-width:1000px}
.lrow{display:grid;grid-template-columns:64px 1fr;align-items:start;padding:26px 0;border-bottom:1px solid var(--hair-l)}
.lrow:first-child{border-top:1px solid var(--hair-l)}
.lrow .i{font-size:14px;font-weight:500;color:var(--tx60);padding-top:.5em}
.lrow p{font-weight:300;font-size:clamp(20px,2.1vw,30px);line-height:1.28;letter-spacing:-.012em}

/* dark */
.dark{background:linear-gradient(175deg,#161923 0%,var(--ink) 40%,#0E1016 100%);color:var(--bn);position:relative;overflow:hidden}
.dark::before{content:"";position:absolute;left:0;right:0;top:0;height:220px;background:linear-gradient(180deg,#F0E8DB,rgba(240,232,219,0));opacity:.14;pointer-events:none}
.dark .lede{color:var(--bn60)}
.dark h2{color:var(--bn)}
.dark .rail span{color:var(--bn)}
.dark .cap input{background:rgba(243,240,232,.06);border-color:var(--rule-d);color:var(--bn)}
.dark .cap label,.dark .cap .fine{color:var(--bn60)}
.dark .sqbtn.solid{background:var(--sig);border-color:var(--sig);color:#fff}
.dark .sqbtn.solid:hover{background:#fff;color:var(--ink);border-color:#fff}
.dark .ok{background:rgba(255,77,18,.12);color:var(--bn)}

/* footer */
.ft{position:relative;z-index:2;padding:80px 0 46px}
.ft .top{display:grid;grid-template-columns:1.1fr .45fr .45fr;gap:60px;align-items:start}
.ft .say{margin-top:26px;font-weight:300;font-size:clamp(26px,2.9vw,42px);line-height:1.3;letter-spacing:-.012em;max-width:640px}
.ft .col{display:flex;flex-direction:column;gap:16px;padding-top:60px}
.ft .col a{font-size:clamp(19px,1.8vw,25px);width:fit-content;transform-origin:left center;transition:transform .25s ease,color .25s ease}
.ft .col a:hover{transform:scale(1.06);color:#FF7A45}
.ft .col a.on{border-bottom:1px solid var(--bn)}
.ft .base{margin-top:110px;display:flex;flex-direction:column;align-items:center;text-align:center;gap:18px;color:var(--bn60);font-size:15px}
.ft .base img{width:46px;height:auto}
.ftag{font-size:clamp(23px,3.3vw,46px);font-weight:400;line-height:1.12;letter-spacing:-.012em;color:#FF6A33;margin:0;
  text-shadow:0 0 12px rgba(255,77,18,.38),0 0 34px rgba(255,77,18,.20);transition:text-shadow .7s ease,color .7s ease}
.atend .ftag{color:#FF7A45;text-shadow:0 0 15px rgba(255,77,18,.80),0 0 44px rgba(255,77,18,.48),0 0 92px rgba(255,77,18,.26)}
@media(prefers-reduced-motion:reduce){.ftag,.atend .ftag{transition:none}}
.ftmark{transition:filter .6s ease}
.atend .ftmark{filter:drop-shadow(0 0 12px rgba(255,77,18,.95)) drop-shadow(0 0 34px rgba(255,77,18,.5))}
.ft .base .bt{display:flex;align-items:center;gap:10px;color:var(--bn);transition:transform .25s ease,color .25s ease}
.ft .base .bt:hover{transform:scale(1.06);color:#FF7A45}
.ft .note{width:100%;margin-top:10px;font-size:11.5px;color:rgba(243,240,232,.4)}

@media (prefers-reduced-motion:no-preference){
  .rv{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s ease}
  .rv.in{opacity:1;transform:none}
}
@media (max-width:1080px){
  .hgrid{grid-template-columns:1fr;gap:48px}
  .bookstage{order:-1;min-height:0;padding:8px 0 4px}
  .types{grid-template-columns:1fr 1fr}
  .type:nth-child(2){border-right:0}
  .type{padding-left:30px;padding-right:30px}
  .type:nth-child(odd){padding-left:0}
  .ft .top{grid-template-columns:1fr;gap:8px}
  .ft .col{padding-top:34px}
}
@media (max-width:760px){
  .hd .wrap{height:72px}
  .lg,.lg img{height:46px}
  .lg{width:46px}
  .hd .wm::before{display:none}
  .hd .wm{font-size:16px}
  .hero{padding:100px 0 66px}
  .bookstage{--bw:min(232px,58vw)}
  .types{grid-template-columns:1fr}
  .type{border-right:0;border-bottom:1px solid var(--hair-l);padding-left:0;padding-right:0}
  .lrow{grid-template-columns:40px 1fr}
  .crow .sqbtn{width:100%;justify-content:center}
}