:root{
  --paper:#f3ead8;--paper2:#e9dcc2;--ink:#2b1e16;--ink2:#5b4a3b;--red:#a8231a;--red2:#b8352a;--gold:#a87b2c;--gold2:#c89a45;
  --dim:#8c7a66;
  --hand:"LXGW WenKai","Kaiti SC","STKaiti","KaiTi","楷体",serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  color:var(--ink);font-family:var(--hand);line-height:1.85;overflow-x:hidden;-webkit-font-smoothing:antialiased;
  background-color:var(--paper);
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='f'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .35 0 0 0 0 .25 0 0 0 0 .15 0 0 0 .09 0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23f)'/%3E%3C/svg%3E"),
    radial-gradient(ellipse at 20% 0%,#f8f1e2,transparent 60%),radial-gradient(ellipse at 90% 100%,#e6d6b8,transparent 60%);
  background-attachment:fixed;
}
h1,h2,h3{font-family:var(--hand);font-weight:700;letter-spacing:.04em}
h2{font-size:clamp(28px,4.4vw,54px);line-height:1.35;margin:.3em 0 .6em}
p{font-size:clamp(16px,1.3vw,19px)}
b{color:var(--red)}
.kicker{color:var(--red);letter-spacing:.35em;font-size:15px}
.kicker::before{content:"";display:inline-block;width:26px;height:10px;margin-right:10px;vertical-align:middle;background:var(--red);border-radius:40% 60% 50% 50%/60% 40% 60% 40%;opacity:.85}
.dim{color:var(--dim)}.red{color:var(--red)}.gold{color:var(--gold)}
.strike{position:relative}
.strike::after{content:"";position:absolute;left:-4%;right:-4%;top:52%;height:.12em;background:var(--ink2);border-radius:50%;transform:rotate(-4deg)}
.mark{background:linear-gradient(transparent 62%,rgba(168,35,26,.18) 62%,rgba(168,35,26,.18) 92%,transparent 92%)}
.note{color:var(--ink2);font-size:15px;margin-top:1em}
.small{font-size:13px}
/* 手绘框 */
.sk{border:2px solid var(--ink);border-radius:255px 15px 225px 15px/15px 225px 15px 255px}
.try{color:var(--ink);background:rgba(255,250,238,.7);padding:.8em 1.1em;margin:1.2em 0;font-size:16px;box-shadow:3px 4px 0 rgba(43,30,22,.12)}
.lead{max-width:780px;color:var(--ink2);margin:0 auto}
.lead.left{margin:0;max-width:820px}
.screen{min-height:100vh;padding:12vh 7vw;position:relative}
.center{text-align:center;display:flex;flex-direction:column;justify-content:center;align-items:center}
.tall{height:320vh;position:relative}
.tall.xl{height:480vh}
.sticky{position:sticky;top:0;height:100vh;overflow:hidden}
section+section::before{content:"";position:absolute;top:0;left:12vw;right:12vw;height:14px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 400 14' preserveAspectRatio='none'%3E%3Cpath d='M0 8 C60 3 90 11 150 7 S260 3 320 8 S380 6 400 7' fill='none' stroke='%232b1e16' stroke-width='1.6' stroke-linecap='round' opacity='.35'/%3E%3C/svg%3E") center/100% 100% no-repeat}
.tall::before{z-index:2}
#progress{position:fixed;top:0;left:0;height:4px;width:0;background:var(--red);z-index:99;border-radius:0 4px 4px 0}
.reveal{opacity:0;transform:translateY(24px);transition:1.2s cubic-bezier(.2,.7,.2,1)}
.reveal.on{opacity:1;transform:none}
.btn{font-family:var(--hand);font-size:19px;letter-spacing:.2em;padding:.55em 1.6em;cursor:pointer;background:transparent;color:var(--ink);transition:.2s}
.btn.gold{background:var(--red);color:#fbf1e0;border:2px solid var(--ink);border-radius:15px 225px 15px 255px/255px 15px 225px 15px;box-shadow:3px 4px 0 var(--ink)}
.btn:hover{transform:translate(-1px,-2px)}
.btn:active{transform:translate(2px,2px);box-shadow:none}
.btn.ghost{background:rgba(255,250,238,.6)}
.btns{display:flex;gap:12px;flex-wrap:wrap;margin:1em 0}

/* intro */
#intro{display:flex;align-items:center;justify-content:center;text-align:center}
#intro h1{font-size:clamp(64px,13vw,170px);letter-spacing:.35em;margin:.25em 0 .15em .35em;color:var(--ink);transition-delay:1.6s}
.quote{font-size:clamp(22px,2.6vw,32px);color:var(--ink2);transition-delay:.3s}
.quote-src{color:var(--dim);font-size:15px;transition-delay:.8s}
#intro .sub{color:var(--ink2);transition-delay:2.4s}
.drop-fall{position:absolute;top:0;left:50%;width:2px;height:100%;pointer-events:none}
.drop-fall span{position:absolute;left:-8px;top:-30px;width:18px;height:24px;background:#f7f1e3;border:2px solid var(--ink);border-radius:50% 50% 50% 50%/60% 60% 40% 40%;animation:fall 4.5s cubic-bezier(.55,0,.8,.4) infinite}
@keyframes fall{0%{top:-30px;opacity:0;background:#fbf7ee}10%{opacity:1}70%{background:#c48a3a}100%{top:105%;opacity:0;background:#2a140a}}
.scroll-hint{position:absolute;bottom:4vh;left:0;right:0;color:var(--dim);font-size:14px;letter-spacing:.3em;animation:breathe 2.4s infinite}
@keyframes breathe{50%{opacity:.3}}

/* cut */
#cut{display:grid;grid-template-columns:1.1fr 1fr;gap:5vw;align-items:center}
.cut-frame{padding:10px;background:#fbf5e8;box-shadow:6px 8px 0 rgba(43,30,22,.15)}
#cutCanvas{width:100%;height:74vh;display:block;cursor:crosshair;touch-action:none;border-radius:6px}
.cut-stats{display:flex;gap:30px;margin:1em 0}
.cut-stats div,.ly-count div,.nums div{display:flex;flex-direction:column}
.cut-stats em,.ly-count em,.nums em{font-style:normal;font-weight:700;font-size:clamp(32px,3.6vw,50px);color:var(--red);line-height:1.1}
.cut-stats span,.ly-count span,.nums span{font-size:13px;color:var(--ink2);letter-spacing:.1em}

/* alive */
.alive-wrap{height:100%;display:grid;grid-template-columns:1fr 1fr;align-items:center;padding:0 8vw;gap:5vw}
#bigDrop{width:min(34vw,380px);justify-self:center}
.alive-text h2{font-size:clamp(50px,7.5vw,104px);margin:.1em 0 .3em}
.alive-bar{height:10px;border:2px solid var(--ink);border-radius:20px 6px 18px 8px;margin:2em 0 .6em;position:relative;overflow:hidden;background:#fbf5e8}
.alive-bar i{position:absolute;left:0;top:0;height:100%;width:0;background:linear-gradient(90deg,#f2ebdc,#d19a45,#6b3515,#0a0605)}
.alive-steps{display:flex;justify-content:space-between;font-size:14px;color:var(--ink2);letter-spacing:.2em}

/* wet */
.huge{font-size:clamp(30px,4.8vw,64px)}
.chem{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:14px;margin-top:3em}
.chem>b{color:var(--ink);font-size:28px}
.chem-node{padding:14px 24px;font-size:21px;display:flex;flex-direction:column;align-items:center;background:rgba(255,250,238,.7)}
.chem-node small{font-size:12px;color:var(--ink2);letter-spacing:.1em}
.chem-node.gold{border-color:var(--red);color:var(--red);background:rgba(168,35,26,.06);box-shadow:4px 5px 0 rgba(168,35,26,.25)}

/* time */
#time{padding-left:0;padding-right:0}
.time-head{padding:0 7vw}
.hint-inline{color:var(--dim);font-size:14px;letter-spacing:.2em}
.timeline{display:flex;gap:26px;overflow-x:auto;padding:30px 7vw 40px;scroll-snap-type:x mandatory;cursor:grab}
.timeline::-webkit-scrollbar{height:6px}.timeline::-webkit-scrollbar-thumb{background:var(--ink2);border-radius:6px}
.tl-card{flex:0 0 min(78vw,320px);min-height:300px;scroll-snap-align:start;padding:30px 26px;background:#fbf5e8;position:relative;transition:.3s;box-shadow:5px 6px 0 rgba(43,30,22,.12)}
.tl-card:nth-child(odd){transform:rotate(-.8deg)}.tl-card:nth-child(even){transform:rotate(.7deg)}
.tl-card:hover{transform:rotate(0) translateY(-6px)}
.tl-card.red{border-color:var(--red)}
.tl-card em{font-style:normal;color:var(--red);font-weight:700;font-size:23px}
.tl-card h3{font-size:22px;margin:.6em 0;line-height:1.5}
.tl-card p{font-size:16px;color:var(--ink2)}

/* vs */
#vs{text-align:center}
.vs-wrap{display:grid;grid-template-columns:1fr 1fr;gap:4vw;margin:3vh auto 0;max-width:1100px}
.vs-panel canvas{width:100%;height:auto;display:block}
.vs-panel p{font-size:22px;margin-top:6px}
.vs-control{max-width:720px;margin:3vh auto 0}
#vsRange{width:100%;-webkit-appearance:none;appearance:none;height:8px;background:#fbf5e8;border:2px solid var(--ink);border-radius:20px 6px 18px 8px;outline:none}
#vsRange::-webkit-slider-thumb{-webkit-appearance:none;width:34px;height:34px;border-radius:50% 45% 55% 50%;background:var(--red);border:2px solid var(--ink);cursor:pointer}
#vsRange::-moz-range-thumb{width:34px;height:34px;border-radius:50%;background:var(--red);border:2px solid var(--ink);cursor:pointer}
.vs-year{font-size:24px;margin-top:.8em}
.vs-year em{font-style:normal;color:var(--red);font-size:52px;font-weight:700}
.vs-cap{min-height:3.6em;color:var(--ink)}

/* layers */
.layers-wrap{height:100%;display:grid;grid-template-columns:1fr 1.1fr;align-items:center;padding:0 7vw;gap:4vw}
#layerCanvas{width:min(46vw,640px);height:auto;justify-self:center}
.layers-text h2{font-size:clamp(44px,6.4vw,86px)}
.ly-count{display:flex;gap:36px;margin-top:2em}

/* polish */
.mirror-wrap{margin-top:3vh;width:min(86vw,640px)}
.mirror-frame{padding:12px;background:#6b4526;box-shadow:6px 8px 0 rgba(43,30,22,.2)}
.mirror{position:relative;aspect-ratio:1.5;border-radius:6px;overflow:hidden;background:#050302;touch-action:none;cursor:grab}
.mirror-reflect{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:clamp(30px,5vw,56px);letter-spacing:.3em;color:rgba(255,240,215,0);transform:scaleY(-1);transition:color .3s}
.mirror-light{position:absolute;inset:-50%;background:linear-gradient(115deg,transparent 42%,rgba(255,255,255,.35) 50%,transparent 58%);opacity:0;pointer-events:none;transition:opacity .3s}
#polishCanvas{position:absolute;inset:0;width:100%;height:100%}
.polish-meter{height:10px;border:2px solid var(--ink);border-radius:20px 6px 18px 8px;margin-top:18px;overflow:hidden;background:#fbf5e8}
.polish-meter i{display:block;height:100%;width:0;background:var(--red);transition:width .2s}

/* uses */
.uses-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:3vh}
.uses-map{display:block;margin:3vh auto 0;max-width:1320px;padding:12px;background:#fbf5e8;box-shadow:6px 8px 0 rgba(43,30,22,.15);transform:rotate(-.3deg);transition:transform .3s}
.uses-map:hover{transform:rotate(0) scale(1.005)}
.uses-map img{display:block;width:100%;height:auto;border-radius:4px}
.center-note{text-align:center}
.uses-grid figure{position:relative;aspect-ratio:4/3.2;background:var(--img) center/cover;overflow:hidden;box-shadow:5px 6px 0 rgba(43,30,22,.15);filter:sepia(.18) saturate(.92)}
.uses-grid figure:nth-child(3n+1){transform:rotate(-.6deg)}.uses-grid figure:nth-child(3n+2){transform:rotate(.5deg)}
.uses-grid figure::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 35%,rgba(20,12,8,.85))}
.uses-grid figcaption{position:absolute;left:0;right:0;bottom:0;padding:20px 22px;color:#fbf1e0}
.uses-grid h3{font-size:25px}
.uses-grid p{font-size:15px;color:#efe3cc}

/* proof */
#proof{text-align:center;overflow:hidden}
.proof-bg{position:absolute;inset:0;background:url(../images/brands/lt-1.jpg) center/cover;opacity:.1;filter:grayscale(1) contrast(1.2);mix-blend-mode:multiply;pointer-events:none}
#proof>*{position:relative}
.group-name{font-size:clamp(46px,7.5vw,100px);letter-spacing:.2em;display:inline-flex;align-items:center;gap:.3em}
.seal{font-style:normal;font-size:.22em;line-height:1.15;letter-spacing:0;color:#fbf1e0;background:var(--red);padding:.35em .4em;border-radius:6px 10px 5px 9px;transform:rotate(6deg)}
.chain{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:10px;margin:3em 0}
.chain span{font-size:19px;padding:10px 20px;background:rgba(255,250,238,.75)}
.chain i{width:34px;height:2px;background:var(--ink);border-radius:2px}
.nums{display:grid;grid-template-columns:repeat(6,1fr);gap:20px;margin:2em auto;max-width:1200px}
.honors{max-width:920px;margin:2em auto;color:var(--ink2)}
.honors p{font-size:16px;padding:9px 0;border-bottom:1.5px dashed rgba(43,30,22,.3)}
.brands{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;max-width:1100px;margin:3em auto 1em}
.brands div{padding:22px 14px;background:rgba(255,250,238,.75);display:flex;flex-direction:column;box-shadow:4px 5px 0 rgba(168,35,26,.2)}
.brands b{font-size:26px;color:var(--ink)}
.brands span{font-size:14px;color:var(--ink2)}

/* fan + name */
.fan-wrap{display:grid;grid-template-columns:1.05fr 1fr;gap:4vw;align-items:start;margin-top:4vh}
.fan-stage{position:relative;padding:4%}
#marble{width:100%;aspect-ratio:1;border-radius:50%;cursor:crosshair;touch-action:none;display:block;box-shadow:0 0 0 12px #8a5a34,0 0 0 15px var(--ink),8px 12px 0 15px rgba(43,30,22,.18)}
.palette{display:flex;gap:10px;justify-content:center;margin-top:40px;flex-wrap:wrap}
.palette button{width:40px;height:40px;border-radius:50% 45% 55% 48%;border:2px solid var(--ink);cursor:pointer;transition:.2s}
.palette button.on{transform:scale(1.2) rotate(-8deg);box-shadow:0 0 0 3px var(--paper),0 0 0 5px var(--ink)}
.fan-side input{display:block;width:100%;background:transparent;border:none;border-bottom:2px solid var(--ink);color:var(--ink);font-family:var(--hand);font-size:26px;padding:8px 2px;margin-bottom:14px;outline:none}
.fan-side input::placeholder{color:#a8977f}
.fan-side input:focus{border-color:var(--red)}
#card{width:100%;max-width:480px;display:block;margin:10px auto 0;box-shadow:6px 8px 0 rgba(43,30,22,.2)}

footer{text-align:center;padding:10vh 7vw;color:var(--ink2);position:relative}
.flogo{height:90px;margin-bottom:1em}
.motto{font-size:28px;color:var(--red);letter-spacing:.4em}
footer a{color:var(--red)}

@media (max-width:860px){
  #cut,.alive-wrap,.layers-wrap,.fan-wrap{grid-template-columns:1fr}
  #cutCanvas{height:50vh}
  .alive-wrap{padding:8vh 7vw;align-content:center}
  #bigDrop{width:46vw}
  #layerCanvas{width:78vw}
  .layers-wrap{align-content:center}
  .uses-grid{grid-template-columns:1fr 1fr}
  .nums{grid-template-columns:repeat(2,1fr)}
  .brands{grid-template-columns:1fr 1fr}
  .vs-wrap{grid-template-columns:1fr;max-width:460px}
}
@media (max-width:520px){ .uses-grid{grid-template-columns:1fr} .chain i{display:none} }