/* 漫叶 / Mekuru 官网样式。颜色 token 与 App 书架一致(docs/shelf_spec.md §6)。
   不加载任何网络字体或第三方脚本(和 App 的隐私承诺一致)。 */
/* Layout concept: the page is an open book. A spine line runs down the hero;
   each section sets its heading on the "left page" and its content on the "right page",
   folding to one column on a phone. Glass only on the top bar, like the app. */
:root{
  --paper:#FAF9F6; --card:#FFFFFF; --ink:#000000; --ink-2:#66666B;
  --accent:#3E6D9C; --on-accent:#FFFFFF; --gold:#A8781E;
  --rule:rgba(20,30,45,.10); --rule-strong:rgba(20,30,45,.22);
  --sheet:#FFFFFF; --panel:#1B1C1F; --tone:#E7E5DF; --tone-2:#CFCCC4;
  --device:#1E1F23; --device-edge:#3A3B41; --tint:rgba(62,109,156,.08);
  --glass:rgba(250,249,246,.72);
  --display:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","Source Han Serif",serif;
  --body:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --wrap:1120px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#131417; --card:#1C1D21; --ink:#FFFFFF; --ink-2:#A1A1A6;
  --accent:#8DB8E2; --on-accent:#131417; --gold:#DDB272;
  --rule:rgba(255,255,255,.10); --rule-strong:rgba(255,255,255,.22);
  --sheet:#E9E7E2; --panel:#1B1C1F; --tone:#CFCCC5; --tone-2:#B5B2AA;
  --device:#2A2B30; --device-edge:#4A4B52; --tint:rgba(141,184,226,.10);
  --glass:rgba(19,20,23,.70); color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#131417; --card:#1C1D21; --ink:#FFFFFF; --ink-2:#A1A1A6;
  --accent:#8DB8E2; --on-accent:#131417; --gold:#DDB272;
  --rule:rgba(255,255,255,.10); --rule-strong:rgba(255,255,255,.22);
  --sheet:#E9E7E2; --panel:#1B1C1F; --tone:#CFCCC5; --tone-2:#B5B2AA;
  --device:#2A2B30; --device-edge:#4A4B52; --tint:rgba(141,184,226,.10);
  --glass:rgba(19,20,23,.70); color-scheme:dark}

*{box-sizing:border-box}
body{background:var(--paper);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--glass)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
h1,h2,h3{font-family:var(--display);font-weight:700;text-wrap:balance;margin:0;letter-spacing:.01em}
p{margin:0}
.eyebrow{font-size:12px;letter-spacing:.14em;color:var(--ink-2)}


/* top bar */
.bar{position:sticky;top:env(safe-area-inset-top,0px);z-index:9;background:var(--glass);
  -webkit-backdrop-filter:saturate(1.6) blur(18px);backdrop-filter:saturate(1.6) blur(18px);border-bottom:1px solid var(--rule)}
.bar .wrap{display:flex;align-items:center;gap:24px;height:56px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:600;font-size:17px}
.brand:hover{text-decoration:none}
.brand svg{width:26px;height:26px}
.nav{display:flex;gap:22px;margin-left:auto;font-size:14.5px}
.nav a{color:var(--ink-2)}
.nav a:hover{color:var(--ink);text-decoration:none}
.lang{font-size:13px;color:var(--ink-2);border:1px solid var(--rule-strong);border-radius:999px;padding:2px 10px}
.lang b{color:var(--ink);font-weight:600}
.lang a{color:var(--ink-2)}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:9px 18px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;font-family:inherit}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent);color:var(--on-accent)}
.btn-quiet{border-color:var(--rule-strong);color:var(--ink);background:transparent}
.bar .btn{padding:6px 14px;font-size:14px}
@media (max-width:720px){.nav{display:none}.bar .wrap{gap:12px}.lang{margin-left:auto}}

/* hero */
.hero{position:relative;padding-block:72px 40px;overflow:hidden}
.hero .spine{position:absolute;left:50%;top:0;bottom:0;width:1px;background:linear-gradient(var(--rule-strong),var(--rule) 70%,transparent)}
.hero-copy{position:relative;text-align:center;max-width:720px;margin:0 auto;display:grid;gap:20px;justify-items:center}
.hero h1{font-size:clamp(34px,6.2vw,64px);line-height:1.18;background:var(--paper);padding:4px 10px}
.hero .lede{font-size:clamp(16px,2vw,18.5px);color:var(--ink-2);max-width:34em;background:var(--paper);padding:2px 6px}
.cta{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.meta{font-size:13px;color:var(--ink-2)}

.stage{position:relative;margin-top:56px;display:flex;justify-content:center;align-items:flex-end;gap:clamp(14px,3vw,40px);flex-wrap:wrap}
.dev{display:grid;gap:12px;justify-items:center}
.dev figcaption{font-size:13px;color:var(--ink-2);text-align:center}
.dev figcaption b{display:block;color:var(--ink);font-weight:600;font-size:14px}
figure{margin:0}
.frame{background:var(--device);border:1px solid var(--device-edge);box-shadow:0 18px 40px -22px rgba(0,0,0,.45);position:relative}
.screen{background:#0B0B0C;position:absolute;overflow:hidden;display:flex;align-items:center;justify-content:center}
.phone{width:clamp(120px,15vw,168px);aspect-ratio:9/19.5;border-radius:26px}
.phone .screen{inset:6px;border-radius:21px}
.phone .screen svg{width:100%;height:auto}
.tablet{width:clamp(250px,36vw,420px);aspect-ratio:4/3;border-radius:22px}
.tablet .screen{inset:10px;border-radius:13px}
.tablet .screen .spread{height:100%;width:auto;max-width:100%}
.duo{width:clamp(210px,28vw,320px);aspect-ratio:1.45/1;perspective:900px;display:flex}
.duo .half{flex:1;background:var(--device);border:1px solid var(--device-edge);position:relative;overflow:hidden}
.duo .half.l{border-radius:18px 4px 4px 18px;transform-origin:right center;transform:rotateY(24deg)}
.duo .half.r{border-radius:4px 18px 18px 4px;transform-origin:left center;transform:rotateY(-24deg)}
.duo .half .screen{inset:7px}
.duo .half.l .screen{right:2px;border-radius:12px 2px 2px 12px}
.duo .half.r .screen{left:2px;border-radius:2px 12px 12px 2px}
.duo .half .screen svg{height:100%;width:auto}
.duo .half.l .screen{justify-content:flex-end}
.duo .half.r .screen{justify-content:flex-start}
@media (max-width:640px){
  .hero{padding-block:48px 28px}
  .hero .spine,.band .spine{display:none}
  .stage{display:grid;grid-template-columns:auto auto;justify-content:center;align-items:end}
  .stage .dev.tablet-wrap{grid-column:1 / -1;order:-1}
  .phone{width:30vw;max-width:130px}
  .tablet{width:82vw;max-width:420px}
  .duo{width:48vw;max-width:220px}
}

/* sections laid out as a spread */
section.spread-sec{padding-block:88px;border-top:1px solid var(--rule)}
.sec{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:56px;align-items:start}
.sec > .left{position:sticky;top:96px;display:grid;gap:14px}
.sec h2{font-size:clamp(26px,3.6vw,40px);line-height:1.25}
.sec .sub{color:var(--ink-2);max-width:26em}
.sec > .right{min-width:0}
@media (max-width:820px){.sec{grid-template-columns:minmax(0,1fr);gap:28px}.sec > .left{position:static}section.spread-sec{padding-block:64px}}

/* three screens */
.screens{display:grid;grid-template-columns:minmax(0,1fr);gap:14px}
.scard{background:var(--card);border:1px solid var(--rule);border-radius:16px;padding:18px;display:grid;gap:6px 22px;grid-template-columns:150px minmax(0,1fr);align-content:center;align-items:center}
.scard .mini{grid-row:span 3;height:100%;min-height:110px;display:flex;align-items:center;justify-content:center;background:var(--tint);border-radius:10px}
.scard h3{font-family:var(--body);font-size:16px;font-weight:600}
.scard p{font-size:14.5px;color:var(--ink-2);line-height:1.65}
.scard .line{font-family:var(--display);font-size:15px;color:var(--ink);line-height:1.6}
@media (max-width:460px){.scard{grid-template-columns:minmax(0,1fr)}.scard .mini{grid-row:auto;height:116px}}
.mini .pg{background:var(--sheet);border:1px solid var(--tone-2)}

/* rotate demo */
.demo{background:var(--card);border:1px solid var(--rule);border-radius:20px;padding:28px;display:grid;gap:22px;justify-items:center}
.demo-stage{height:300px;width:100%;display:flex;align-items:center;justify-content:center}
.rot{width:150px;height:300px;border-radius:26px;background:var(--device);border:1px solid var(--device-edge);position:relative;
  transition:width .55s cubic-bezier(.3,.7,.2,1),height .55s cubic-bezier(.3,.7,.2,1)}
.rot .screen{inset:6px;border-radius:21px;align-items:flex-start}
.rot .screen svg{width:100%;height:auto;transition:transform .55s cubic-bezier(.3,.7,.2,1)}
.rot.land{width:300px;height:150px}
.rot.land .screen svg{transform:translateY(-22%)}
.rot .badge{position:absolute;left:50%;bottom:14px;transform:translateX(-50%);font-family:var(--mono);font-size:11.5px;
  color:#fff;background:rgba(0,0,0,.62);padding:3px 9px;border-radius:999px;white-space:nowrap;font-variant-numeric:tabular-nums}
.demo-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:14px 20px}
.demo-row .note{font-size:14px;color:var(--ink-2)}
.chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.chip{font-size:13px;border:1px solid var(--rule-strong);border-radius:999px;padding:3px 12px;color:var(--ink-2)}
@media (max-width:420px){.demo{padding:20px 14px}.rot.land{width:260px;height:130px}}
@media (prefers-reduced-motion:reduce){.rot,.rot .screen svg{transition:none}}

/* reading modes */
.modes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.mode{border:1px solid var(--rule);border-radius:16px;padding:18px;display:grid;gap:12px;background:var(--card)}
.mode .pic{height:110px;display:flex;align-items:center;justify-content:center;gap:0}
.mode h3{font-family:var(--body);font-size:15.5px;font-weight:600}
.mode p{font-size:14px;color:var(--ink-2)}
.pgbox{width:44px;height:62px;background:var(--sheet);border:1px solid var(--tone-2);display:flex;align-items:flex-end;justify-content:center;
  font-family:var(--mono);font-size:10.5px;color:#55565B;padding-bottom:4px}
.pair{display:flex;box-shadow:0 1px 0 var(--rule)}
.pair .pgbox + .pgbox{border-left:1px solid #9A978F}
.arrow{font-size:20px;color:var(--accent);margin:0 10px;line-height:1}
.vstack{display:grid;gap:6px;height:110px;overflow:hidden;align-content:start;mask-image:linear-gradient(#000 70%,transparent);-webkit-mask-image:linear-gradient(#000 70%,transparent)}
.vstack .pgbox{width:64px;height:44px}
.extras{margin-top:22px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 24px;font-size:14.5px}
.extras div{display:flex;gap:10px;align-items:baseline}
.extras div::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--accent);transform:translateY(-2px)}
@media (max-width:760px){.modes{grid-template-columns:minmax(0,1fr)}.mode{grid-template-columns:150px minmax(0,1fr);align-items:center}.mode .pic{grid-row:span 2}.extras{grid-template-columns:minmax(0,1fr)}}
@media (max-width:420px){.mode{grid-template-columns:minmax(0,1fr)}.mode .pic{grid-row:auto}}

/* library */
.shelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(104px,1fr));gap:18px 14px}
.book{display:grid;gap:7px}
.cover{aspect-ratio:2/3;border-radius:4px;position:relative;overflow:hidden;box-shadow:0 1px 2px rgba(0,0,0,.12),0 6px 14px -8px rgba(0,0,0,.3)}
.cover::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.16),transparent 9%)}
.cover .prog{position:absolute;left:0;right:0;bottom:0;height:3px;background:rgba(255,255,255,.55)}
.cover .prog i{display:block;height:100%;background:var(--gold)}
.book .t{font-size:13px;line-height:1.35;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.book .s{font-size:12px;color:var(--ink-2);display:flex;align-items:center;gap:6px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}
.formats{margin-top:26px;display:flex;flex-wrap:wrap;gap:8px}
.fmt{font-family:var(--mono);font-size:12.5px;border:1px solid var(--rule-strong);border-radius:6px;padding:3px 9px}
.libnote{margin-top:14px;font-size:14.5px;color:var(--ink-2);max-width:36em}

/* privacy */
.vows{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--rule);border:1px solid var(--rule);border-radius:16px;overflow:hidden}
.vow{background:var(--card);padding:24px 22px;display:grid;grid-template-columns:36px minmax(0,1fr);gap:4px 14px;align-items:start}
.vow svg{width:30px;height:30px;grid-row:span 2;color:var(--accent)}
.vow b{font-size:16px;font-weight:600}
.vow span{font-size:14px;color:var(--ink-2)}
@media (max-width:520px){.vows{grid-template-columns:minmax(0,1fr)}}

/* pricing */
.plans{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.plan{border:1px solid var(--rule);border-radius:18px;padding:26px 24px;background:var(--card);display:grid;gap:16px;align-content:start}
.plan.pro{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset}
.plan h3{font-family:var(--body);font-size:18px;font-weight:600;display:flex;align-items:center;gap:10px}
.tag{font-size:11.5px;font-weight:600;letter-spacing:.06em;color:var(--on-accent);background:var(--accent);border-radius:999px;padding:1px 9px}
.price{font-family:var(--display);font-size:30px;line-height:1.1}
.price small{font-family:var(--body);font-size:13px;color:var(--ink-2);font-weight:400;margin-left:6px}
.plan ul{list-style:none;margin:0;padding:0;display:grid;gap:9px;font-size:14.5px}
.plan li{display:grid;grid-template-columns:18px minmax(0,1fr);gap:8px}
.plan li::before{content:"";width:12px;height:7px;border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:translateY(7px) rotate(-45deg)}
.plan .fine{font-size:13px;color:var(--ink-2)}
.pricenote{margin-top:16px;font-size:14px;color:var(--ink-2)}
@media (max-width:620px){.plans{grid-template-columns:minmax(0,1fr)}}

/* faq */
.faq{border-top:1px solid var(--rule)}
.faq details{border-bottom:1px solid var(--rule)}
.faq summary{cursor:pointer;list-style:none;padding:18px 34px 18px 0;font-weight:600;font-size:16px;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:6px;top:26px;width:9px;height:9px;border-right:1.5px solid var(--ink-2);border-bottom:1.5px solid var(--ink-2);transform:rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(-135deg);top:30px}
.faq details p{padding:0 0 20px;color:var(--ink-2);font-size:15px;max-width:38em}

/* beta band */
.band{padding-block:80px;border-top:1px solid var(--rule);text-align:center;position:relative;overflow:hidden}
.band .spine{position:absolute;left:50%;top:0;height:100%;width:1px;background:linear-gradient(transparent,var(--rule-strong) 30%,transparent)}
.band .inner{position:relative;display:grid;gap:16px;justify-items:center}
.band h2{font-size:clamp(26px,4vw,42px);background:var(--paper);padding:2px 10px}
.band p{color:var(--ink-2);max-width:30em;background:var(--paper);padding:2px 6px}
.mail{font-family:var(--mono);font-size:15px;user-select:all;background:var(--card);border:1px solid var(--rule-strong);border-radius:8px;padding:6px 14px;color:var(--ink)}

/* footer */
footer{border-top:1px solid var(--rule);padding-block:36px 48px;font-size:13px;color:var(--ink-2)}
.foot{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px 40px;align-items:start}
.foot .links{display:flex;flex-wrap:wrap;gap:8px 20px}
.foot .links a{color:var(--ink-2)}
.foot .legal{grid-column:1 / -1;display:grid;gap:6px;line-height:1.6}
.foot .slogan{font-family:var(--display);font-size:15px;color:var(--ink)}
@media (max-width:620px){.foot{grid-template-columns:minmax(0,1fr)}}

html[lang="en"]{--display:ui-serif,"New York","Iowan Old Style",Georgia,serif}

/* legal and support pages */
.doc{max-width:720px;margin:0 auto;padding-block:56px 72px;display:grid;gap:18px}
.doc h1{font-size:clamp(30px,5vw,42px);line-height:1.2}
.doc h2{font-size:22px;margin-top:22px}
.doc h3{font-family:var(--body);font-size:16.5px;font-weight:600;margin-top:8px}
.doc p,.doc li{font-size:16px;line-height:1.8}
.doc ul,.doc ol{margin:0;padding-left:1.3em;display:grid;gap:6px}
.doc .lead{font-size:18px;color:var(--ink)}
.doc .muted{color:var(--ink-2);font-size:14px}
.doc .switch{display:flex;gap:10px;flex-wrap:wrap;font-size:14px}
.doc .switch a{border:1px solid var(--rule-strong);border-radius:999px;padding:3px 12px;color:var(--ink)}
.doc .switch a:hover{text-decoration:none;border-color:var(--accent)}
.doc hr{border:0;border-top:1px solid var(--rule);margin:40px 0 8px;width:100%}
.doc .box{background:var(--card);border:1px solid var(--rule);border-radius:14px;padding:18px 20px;display:grid;gap:8px}
.doc .mail{justify-self:start}
.doc table{width:100%;border-collapse:collapse;font-size:15px}
.doc th,.doc td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--rule);vertical-align:top}
.doc th{font-weight:600}
.tablewrap{overflow-x:auto}