/* ————————————————— POTION · potion-web ————————————————— */
:root{
  --bg:#EDE7DC;
  --bg-deep:#E4DCCF;
  --ink:#171410;
  --ink-soft:#4d463c;
  --muted:#8a8172;
  --hair:rgba(23,20,16,.16);
  --hair-soft:rgba(23,20,16,.08);
  --lilac:#a396d1;
  --pad:clamp(20px,4vw,64px);
  --ease:cubic-bezier(.16,1,.3,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);
  font-family:"Helvetica Neue",-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-weight:400;line-height:1.5;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--lilac);color:#fff}
img,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
.mono{font-family:ui-monospace,"SF Mono",Menlo,Consolas,"PingFang SC","Microsoft YaHei",monospace;font-size:11px;letter-spacing:.12em;text-transform:uppercase;font-weight:500}
.serif{font-family:"Songti SC","STSong","Noto Serif SC","SimSun",serif;font-style:normal;font-weight:600}
.dim{color:var(--muted)}

/* ——— reveal ——— */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ————————————————— loader ————————————————— */
.loader{
  position:fixed;inset:0;z-index:200;background:var(--bg);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;
  transition:transform .9s var(--ease);
}
.loader.done{transform:translateY(-101%)}
.loader-mark{font-weight:600;letter-spacing:.55em;font-size:clamp(15px,2vw,20px);padding-left:.55em}
.loader-count{color:var(--muted)}

/* ————————————————— header ————————————————— */
.site-head{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:grid;grid-template-columns:1fr auto 1fr auto;align-items:center;gap:32px;
  padding:18px var(--pad);
  transition:background .4s,box-shadow .4s;
}
.site-head.scrolled{background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);box-shadow:0 1px 0 var(--hair-soft)}
.head-mark{font-weight:650;letter-spacing:.34em;font-size:14px}
.head-mark sup{font-size:8px;letter-spacing:0}
.head-nav{display:flex;gap:clamp(16px,3vw,44px)}
.head-nav a{position:relative;padding-bottom:4px}
.head-nav a span{color:var(--muted);margin-right:7px}
.head-nav a::after{content:"";position:absolute;left:0;bottom:0;height:1px;width:100%;background:var(--ink);transform:scaleX(0);transform-origin:right;transition:transform .45s var(--ease)}
.head-nav a:hover::after{transform:scaleX(1);transform-origin:left}
.head-nav a.head-tour{color:var(--ink);font-weight:600;letter-spacing:.14em}
.head-nav a.head-tour span{color:var(--lilac)}
.head-nav a.head-tour::after{transform:scaleX(1);height:1.5px}
.head-nav a.head-tour:hover{color:var(--lilac)}
.head-time{justify-self:end;display:flex;gap:10px}
.pill{
  border:1px solid var(--ink);border-radius:999px;padding:9px 20px;
  font-size:12px;letter-spacing:.04em;font-weight:500;
  transition:background .35s var(--ease),color .35s var(--ease);
}
.pill:hover{background:var(--ink);color:var(--bg)}

/* ————————————————— hero ————————————————— */
.hero{min-height:100svh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:110px var(--pad) 40px;position:relative}
.hero-scatter{
  display:grid;grid-template-columns:repeat(4,minmax(60px,120px));gap:4px 28px;
  color:var(--ink-soft);margin-bottom:clamp(30px,6vh,70px);text-align:left;
}
.hero-scatter span:nth-child(4n+2){text-align:center}
.hero-scatter span:nth-child(4n){text-align:right}
.hero-paren{color:var(--muted);margin-bottom:clamp(12px,2.5vh,28px)}
.hero-title{
  font-size:clamp(52px,11.5vw,168px);
  line-height:.94;font-weight:480;letter-spacing:-.035em;
  font-variation-settings:"wght" 480;
}
.hero-title .serif{letter-spacing:-.02em}
.hero-title .line{display:block;overflow:hidden}
.hero-title .line>span{display:inline-block;transform:translateY(110%);transition:transform 1.1s var(--ease)}
body.ready .hero-title .line>span{transform:none}
.hero-title .line:nth-child(2)>span{transition-delay:.08s}
.hero-title .line:nth-child(3)>span{transition-delay:.16s}
.hero-foot{margin-top:clamp(28px,5vh,64px);display:flex;flex-direction:column;align-items:center;gap:22px}
.hero-sub{max-width:400px;font-size:15px;color:var(--ink-soft)}
.hero-meta{display:flex;gap:34px;color:var(--muted)}
.scroll-cue{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);color:var(--muted);transition:color .3s}
.scroll-cue:hover{color:var(--ink)}

/* ————————————————— marquee ————————————————— */
.marquee{overflow:hidden;border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);padding:13px 0}
.marquee-track{display:flex;white-space:nowrap;width:max-content;animation:mq 36s linear infinite}
.marquee-track span{color:var(--ink-soft)}
@keyframes mq{to{transform:translateX(-50%)}}

/* ————————————————— section chrome ————————————————— */
.sec-head{display:flex;align-items:center;gap:18px;padding:26px var(--pad)}
.sec-num{color:var(--muted)}
.rule{flex:1;height:1px;background:var(--hair)}
.sec-tag{color:var(--ink-soft)}
.sec-title{
  font-size:clamp(40px,6.4vw,96px);line-height:.98;letter-spacing:-.03em;font-weight:480;
  padding:clamp(20px,4vh,50px) var(--pad) clamp(30px,6vh,70px);
}

/* ————————————————— 01 · film stage ————————————————— */
.stage-wrap{padding-bottom:clamp(60px,10vh,130px)}
.stage{position:relative;padding:clamp(8px,2vw,30px) var(--pad) 0}
.ambient{
  position:absolute;inset:-6% -4%;width:108%;height:112%;z-index:0;
  filter:blur(72px) saturate(1.15);opacity:.55;
  -webkit-mask-image:radial-gradient(70% 62% at 50% 46%,#000 40%,transparent 78%);
          mask-image:radial-gradient(70% 62% at 50% 46%,#000 40%,transparent 78%);
  pointer-events:none;
}
.film-frame{position:relative;z-index:1;max-width:1220px;margin:0 auto}
.film-frame video{
  width:100%;aspect-ratio:16/9;object-fit:cover;
  -webkit-mask-image:radial-gradient(108% 100% at 50% 48%,#000 58%,rgba(0,0,0,.94) 72%,transparent 97%);
          mask-image:radial-gradient(108% 100% at 50% 48%,#000 58%,rgba(0,0,0,.94) 72%,transparent 97%);
  cursor:pointer;
}
.wash{
  position:absolute;inset:0;background:var(--bg);opacity:0;pointer-events:none;
  transition:opacity .35s ease;
  -webkit-mask-image:radial-gradient(108% 100% at 50% 48%,#000 58%,rgba(0,0,0,.94) 72%,transparent 97%);
          mask-image:radial-gradient(108% 100% at 50% 48%,#000 58%,rgba(0,0,0,.94) 72%,transparent 97%);
}
.wash.on{opacity:.92;transition:opacity .18s ease}

.film-ui{position:relative;z-index:2;max-width:1220px;margin:clamp(6px,1.5vh,18px) auto 0;padding:0 var(--pad)}
.chapters{
  list-style:none;display:grid;
  grid-template-columns:repeat(7,1fr);gap:10px;
}
.chapter{cursor:pointer;padding-top:10px;position:relative;user-select:none}
.chapter .bar{height:2px;background:var(--hair);position:relative;overflow:hidden;margin-bottom:10px}
.chapter .bar i{position:absolute;inset:0;background:var(--ink);transform:scaleX(0);transform-origin:left;display:block}
.chapter .c-idx{font-size:10px;color:var(--muted);display:block;margin-bottom:2px}
.chapter .c-label{font-size:clamp(10px,1.05vw,13px);letter-spacing:.1em;text-transform:uppercase;font-weight:600;color:var(--muted);transition:color .3s;display:block}
.chapter .c-cn{font-size:10px;color:var(--muted);opacity:.7;display:block;margin-top:1px}
.chapter:hover .c-label{color:var(--ink-soft)}
.chapter.active .c-label{color:var(--ink)}
.chapter.active .c-cn{color:var(--ink-soft)}
.film-ctrl{display:flex;align-items:center;gap:26px;margin-top:22px;color:var(--ink-soft)}
.ctrl-btn{letter-spacing:.12em;position:relative;padding-bottom:3px}
.ctrl-btn::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;background:var(--ink);transform:scaleX(0);transition:transform .4s var(--ease);transform-origin:right}
.ctrl-btn:hover::after{transform:scaleX(1);transform-origin:left}
.timecode{margin-left:auto;color:var(--muted)}

/* ————————————————— 02 · app ————————————————— */
.app-sec{padding-bottom:clamp(60px,10vh,130px)}
.app-split{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(30px,5vw,90px);padding:0 var(--pad);align-items:start}
.app-rows{list-style:none}
.app-row{
  display:grid;grid-template-columns:56px 1fr auto;grid-template-rows:auto auto;gap:2px 18px;
  padding:26px 6px;border-top:1px solid var(--hair);cursor:pointer;position:relative;
  transition:padding-left .45s var(--ease);
}
.app-row:last-child{border-bottom:1px solid var(--hair)}
.app-row .idx{color:var(--muted);padding-top:10px;letter-spacing:.2em}
.app-row h3{font-size:clamp(26px,3.4vw,46px);font-weight:500;letter-spacing:-.02em;line-height:1;grid-column:2}
.app-row p{grid-column:2;color:var(--ink-soft);font-size:14px;max-width:420px;margin-top:8px}
.app-row .row-arrow{grid-column:3;grid-row:1/3;align-self:center;font-size:22px;opacity:0;transform:translateX(-10px);transition:.45s var(--ease)}
.app-row:hover,.app-row.hot{padding-left:18px}
.app-row:hover .row-arrow,.app-row.hot .row-arrow{opacity:1;transform:none}
.app-visual{position:sticky;top:110px}
.app-still{position:relative;overflow:hidden;border-radius:6px;background:var(--bg-deep)}
.app-still video{aspect-ratio:4/4.6;object-fit:cover;width:100%;transition:opacity .4s ease}
.app-still video.swap{opacity:0}
.app-still figcaption{position:absolute;left:14px;bottom:12px;color:#fff;mix-blend-mode:difference}
.app-hint{color:var(--muted);margin-top:14px;text-align:right}

.feat-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--hair-soft);
  border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);
  margin:clamp(60px,10vh,120px) 0 0;
}
.feat{background:var(--bg);padding:34px var(--pad) 44px 28px}
.feat .mono{color:var(--muted)}
.feat h4{font-size:19px;font-weight:550;margin:44px 0 8px;letter-spacing:-.01em}
.feat p{font-size:13.5px;color:var(--ink-soft)}

.tour-cta{
  display:grid;grid-template-columns:1fr auto;grid-template-rows:auto auto;align-items:center;
  gap:10px 24px;margin:clamp(50px,8vh,100px) var(--pad) 0;
  border:1px solid var(--hair);border-radius:16px;
  padding:clamp(24px,3.4vw,44px);
  transition:background .4s var(--ease),border-color .4s;
}
.tour-cta .mono{color:var(--muted);grid-column:1/-1}
.tour-cta strong{font-size:clamp(24px,3.2vw,44px);font-weight:490;letter-spacing:-.025em;line-height:1.05}
.tour-cta .cta-arrow{font-size:clamp(26px,3vw,40px);transition:transform .4s var(--ease)}
.tour-cta:hover{background:color-mix(in srgb,var(--bg-deep) 45%,var(--bg));border-color:var(--ink)}
.tour-cta:hover .cta-arrow{transform:translateX(10px)}

/* ————————————————— 03 · science ————————————————— */
.sci-sec{padding-bottom:clamp(60px,10vh,130px)}
.sci-intro{padding:0 var(--pad);margin-top:calc(-1 * clamp(16px,4vh,50px));color:var(--muted);font-size:14.5px}
.sci-tabs{display:flex;gap:8px;flex-wrap:wrap;padding:clamp(20px,3.5vh,40px) var(--pad) 22px}
.sci-tabs button{
  border:1px solid var(--hair);border-radius:999px;padding:9px 20px;
  font:inherit;letter-spacing:.12em;text-transform:uppercase;font-size:11px;
  color:var(--ink-soft);transition:background .3s var(--ease),color .3s var(--ease),border-color .3s;
}
.sci-tabs button:hover{border-color:var(--ink)}
.sci-tabs button.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.sheets{display:flex;flex-direction:column;gap:14px;padding:0 var(--pad)}
.sheet{
  display:grid;grid-template-columns:minmax(230px,.72fr) 2fr;gap:clamp(24px,4vw,80px);
  background:color-mix(in srgb,var(--bg-deep) 45%,var(--bg));
  border:1px solid var(--hair-soft);border-radius:16px;
  padding:clamp(24px,3.2vw,46px);
}
.sheet-kicker{color:var(--muted)}
.sheet-info h3{font-size:clamp(30px,3.6vw,52px);line-height:1.02;letter-spacing:-.025em;font-weight:490;margin:16px 0 14px}
.sheet-info p{font-size:14px;color:var(--ink-soft);max-width:300px}
.sheet-more{display:inline-block;margin-top:24px;color:var(--ink-soft);position:relative;padding-bottom:3px}
.sheet-more::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;background:var(--ink);transform:scaleX(0);transition:transform .4s var(--ease);transform-origin:right}
.sheet-more:hover::after{transform:scaleX(1);transform-origin:left}
.t-row{
  display:grid;grid-template-columns:1.15fr 1.3fr .95fr .8fr;gap:16px;align-items:center;
  padding:16px 6px;border-bottom:1px solid var(--hair-soft);font-size:15px;
  transition:background .3s,padding-left .3s;
}
.t-row:last-child{border-bottom:0}
.t-row:hover{background:var(--bg-deep);padding-left:14px}
.t-head{color:var(--muted);border-bottom:1px solid var(--hair)}
.t-head:hover{background:none;padding-left:6px}
.t-name{font-weight:550;display:flex;align-items:center;gap:12px}
.t-row .mono{color:var(--ink-soft)}
.dot{width:9px;height:9px;border-radius:50%;display:inline-block;flex:none}
.d1{background:#e8a1b7}.d2{background:#a396d1}.d3{background:#8fc2cf}.d4{background:#d9b477}.d5{background:#a9c99a}
.d6{background:#dfa06a}.d7{background:#c9c97a}.d8{background:#8fb7d9}.d9{background:#9ec4dd}
.d10{background:#8fc9b8}.d11{background:#b5c98a}.d12{background:#89aed4}
.status{display:flex;align-items:center;gap:8px;color:#3c7a50;font-weight:550;font-size:14px}
.status i{width:7px;height:7px;border-radius:50%;background:#3c7a50;flex:none}
.sci-note{color:var(--muted);padding:18px var(--pad) 0}

/* ————————————————— mailing list ————————————————— */
.mail-sec{padding:clamp(50px,9vh,110px) var(--pad) 0}
.mail-band{
  border:1px solid var(--hair);border-radius:16px;
  background:color-mix(in srgb,var(--bg-deep) 40%,var(--bg));
  padding:clamp(34px,5.5vw,70px) clamp(20px,4vw,60px);
  display:flex;flex-direction:column;align-items:center;text-align:center;gap:14px;
}
.mail-band>.mono{color:var(--muted)}
.mail-band h3{font-size:clamp(30px,4.8vw,68px);line-height:1;letter-spacing:-.03em;font-weight:490}
.mail-form{display:flex;gap:12px;margin-top:16px;width:min(460px,100%)}
.mail-form input{
  flex:1;min-width:0;font:inherit;font-size:14.5px;color:var(--ink);
  background:transparent;border:0;border-bottom:1px solid var(--hair);
  border-radius:0;padding:10px 4px;outline:none;transition:border-color .3s;
  text-align:center;
}
.mail-form input:focus{border-color:var(--ink)}
.mail-form input::placeholder{color:var(--muted)}
.mail-form .pill{background:var(--ink);color:var(--bg);border-color:var(--ink);white-space:nowrap}
.mail-form .pill:hover{background:var(--ink-soft)}
.mail-thanks{display:none;font-size:15px;color:var(--ink-soft)}
.mail-band.done .mail-form{display:none}
.mail-band.done .mail-thanks{display:block}
.mail-note{color:var(--muted)}

/* ————————————————— 04 · download ————————————————— */
.dl-sec{text-align:center;padding-bottom:clamp(70px,12vh,150px)}
.dl-mascot{width:clamp(120px,14vw,190px);margin:clamp(20px,4vh,50px) auto 26px;border-radius:50%;overflow:hidden;aspect-ratio:1}
.dl-mascot img{width:100%;height:100%;object-fit:cover}
.dl-title{font-size:clamp(56px,10vw,150px);line-height:.95;letter-spacing:-.035em;font-weight:480}
.dl-title .line{display:block;overflow:hidden;padding-bottom:.08em;margin-bottom:-.04em}
.dl-title .line>span{display:inline-block;transform:translateY(110%);transition:transform 1s var(--ease)}
.dl-title.in .line>span{transform:none}
.dl-title .line:nth-child(2)>span{transition-delay:.09s}
.dl-btns{display:flex;gap:14px;justify-content:center;margin-top:clamp(28px,5vh,54px)}
.store-btn{
  display:inline-flex;align-items:center;gap:10px;
  background:var(--ink);color:var(--bg);border-radius:999px;
  padding:15px 30px;font-size:14px;font-weight:500;letter-spacing:.02em;
  border:1px solid var(--ink);transition:.35s var(--ease);
}
.store-btn span{font-size:16px}
.store-btn:hover{transform:translateY(-3px)}
.store-btn.ghost{background:transparent;color:var(--ink)}
.store-btn.ghost:hover{background:var(--ink);color:var(--bg)}
.dl-note{color:var(--muted);margin-top:22px}

/* ————————————————— footer ————————————————— */
.foot{border-top:1px solid var(--hair);padding:44px var(--pad) 20px;overflow:hidden}
.foot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px}
.f-col{display:flex;flex-direction:column;gap:9px}
.f-h{color:var(--muted);margin-bottom:6px}
.f-col a{width:fit-content;position:relative}
.f-col a::after{content:"";position:absolute;left:0;bottom:-2px;width:100%;height:1px;background:var(--ink);transform:scaleX(0);transition:transform .4s var(--ease);transform-origin:right}
.f-col a:hover::after{transform:scaleX(1);transform-origin:left}
.foot-mark{
  font-size:clamp(90px,19vw,300px);font-weight:600;letter-spacing:.02em;line-height:.8;
  text-align:center;margin-top:60px;
  color:transparent;-webkit-text-stroke:1px var(--hair);
  user-select:none;
}
.foot-base{display:flex;justify-content:space-between;color:var(--muted);margin-top:30px;padding-top:16px;border-top:1px solid var(--hair-soft)}

/* ————————————————— responsive ————————————————— */
@media (max-width:1020px){
  .app-split{grid-template-columns:1fr}
  .app-visual{position:static;order:-1}
  .app-still video{aspect-ratio:16/10}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .sheet{grid-template-columns:1fr;gap:22px}
  .sheet-info p{max-width:none}
}
@media (max-width:1100px){
  .head-time{display:none}
  .site-head{grid-template-columns:1fr auto auto}
}
@media (max-width:960px){
  .head-nav{display:none}
  .site-head{grid-template-columns:1fr auto;gap:14px}
}
@media (max-width:760px){
  .hero-scatter{grid-template-columns:repeat(2,minmax(80px,140px))}
  .hero-scatter span:nth-child(4n+2){text-align:right}
  .hero-scatter span:empty{display:none}
  .chapters{grid-template-columns:repeat(4,1fr);gap:8px 12px}
  .chapter .c-cn{display:none}
  .film-frame video,.wash{
    -webkit-mask-image:radial-gradient(130% 115% at 50% 48%,#000 62%,rgba(0,0,0,.95) 78%,transparent 100%);
            mask-image:radial-gradient(130% 115% at 50% 48%,#000 62%,rgba(0,0,0,.95) 78%,transparent 100%);
  }
  .t-row{grid-template-columns:1.1fr 1fr 76px;gap:10px;font-size:13px}
  .t-row span:nth-child(3){display:none}
  .t-row span{min-width:0;overflow-wrap:anywhere}
  .t-row .mono{font-size:10px;letter-spacing:.04em;white-space:nowrap}
  .status{font-size:12px;gap:6px}
  .foot-grid{grid-template-columns:repeat(2,1fr)}
  .dl-btns{flex-direction:column;align-items:center}
  .mail-form{flex-direction:column;gap:16px}
  .mail-form .pill{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}

/* ————————————————— 中文排版覆盖 ————————————————— */
body{line-height:1.65}
.hero-title{letter-spacing:.02em;line-height:1.08;font-size:clamp(48px,10.5vw,150px)}
.sec-title{letter-spacing:.02em;line-height:1.14}
.dl-title{letter-spacing:.02em;line-height:1.1}
.sheet-info h3{letter-spacing:.02em;line-height:1.18}
.mail-band h3{letter-spacing:.02em;line-height:1.18}
.app-row h3{letter-spacing:.02em}
.tour-cta strong{letter-spacing:.02em;line-height:1.3}
.hero-sub,.app-row p,.sheet-info p,.feat p{line-height:1.8}
.hero-scatter{letter-spacing:.22em}