:root{
  --paper:#f8f8f5;--ink:#292e29;--muted:#858b82;--line:#e7e8e2;--sage:#637a66;
  --serif:Georgia,"Iowan Old Style","Palatino Linotype","Songti SC","Noto Serif CJK SC","Source Han Serif SC","SimSun",serif;
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans","Malgun Gothic",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
/* 滚动条槽位两侧对称预留：内容高度不同、或 RTL 语言滚动条在左侧时，
   .wrap 的 calc(100% - 48px) 都不会因为滚动条出现/消失而变窄或偏移。 */
*{box-sizing:border-box}html{scroll-behavior:smooth;scrollbar-gutter:stable both-edges}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}button,select{font:inherit}
[hidden]{display:none!important}
:focus-visible{outline:1px solid var(--sage);outline-offset:4px}
.wrap{width:min(1040px,calc(100% - 48px));margin:0 auto}

/* header */
header{height:64px;border-bottom:1px solid var(--line);display:flex;align-items:center}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:inline-flex;align-items:center;gap:9px;font-size:18px;font-weight:600;letter-spacing:-.3px}
.brand-logo{display:block;width:26px;height:26px;flex:0 0 26px}
.brand-name{display:inline-block;color:var(--ink);direction:ltr}
.brand-name > span{color:var(--sage);font-weight:400}

/* language */
.language{position:relative;flex:0 0 auto}
.lang-button{display:inline-flex;align-items:center;gap:6px;border:0;background:none;padding:6px 0;margin:0;color:#6d756c;font-size:11.5px;line-height:1.4;cursor:pointer;transition:color .15s}
.lang-button:hover,.language.open .lang-button{color:var(--ink)}
.lang-button .chev{width:9px;height:6px;flex:0 0 9px;transition:transform .2s}
.language.open .chev{transform:rotate(180deg)}
.lang-menu{position:absolute;right:0;top:calc(100% + 6px);width:min(340px,calc(100vw - 40px));max-height:min(76vh,436px);overflow-y:auto;display:none;grid-template-columns:1fr 1fr;gap:2px;margin:0;padding:8px;list-style:none;background:#fff;border:1px solid var(--line);box-shadow:0 14px 30px rgba(41,46,41,.09);z-index:30}
.language.open .lang-menu{display:grid}
.lang-menu li{min-width:0}
.lang-menu a{display:block;padding:5px 9px;font-size:11.5px;line-height:1.35;color:#5f685e;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lang-menu a:hover{background:#f4f5f0;color:var(--ink)}
.lang-menu a[aria-current="true"]{color:var(--ink);font-weight:600}

/* home */
main{min-height:calc(100vh - 122px)}.home{padding:62px 0 88px}
.intro{margin-bottom:40px}
.intro-kicker{font-size:10px;letter-spacing:.1em;color:var(--sage);margin-bottom:13px}
.intro h1{font:400 clamp(32px,4.6vw,44px)/1.1 var(--serif);letter-spacing:-1.1px;margin:0}
.intro p{font-size:12.5px;line-height:1.75;color:var(--muted);margin:15px 0 0;max-width:480px;text-wrap:balance}
.categories{display:flex;gap:24px;align-items:center;flex-wrap:wrap;border-bottom:1px solid var(--line);padding:0 0 13px;margin-bottom:34px}
.categories button{padding:0;border:0;background:none;color:var(--muted);font-size:12px;cursor:pointer;transition:color .15s}
.categories button:hover,.categories button[aria-pressed="true"]{color:var(--ink)}
.categories button[aria-pressed="true"]{text-decoration:underline;text-decoration-color:var(--sage);text-underline-offset:7px;text-decoration-thickness:1px}
/* 关掉筛选栏时用它顶替：28px 与原来「按钮行 + 13px padding + 1px 线」等高，横线位置不动 */
.home-rule{height:28px;border-bottom:1px solid var(--line);margin-bottom:34px}
.book-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:38px 24px}
.book-card{display:block;min-width:0}
/* .book-card 自己声明了 display:block，会盖掉 UA 的 [hidden]，筛选时要显式压回去 */
.book-card[hidden]{display:none}
.cover-wrap{transition:transform .22s ease}
.book-card:hover .cover-wrap{transform:translateY(-3px)}
/* 封面下：产品名在左、价格在右，同一行；名字过长自动截断 */
.book-meta{display:flex;align-items:baseline;justify-content:space-between;gap:14px;margin-top:11px}
.book-name{font-size:11.5px;line-height:1.4;color:var(--ink);min-width:0;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.book-price{font-size:11.5px;color:var(--ink);font-variant-numeric:tabular-nums;
  flex:0 0 auto;white-space:nowrap}
.book-card:hover .cover{border-color:rgba(42,54,42,.2)}
.cover{aspect-ratio:.705;position:relative;overflow:hidden;padding:18px 16px 15px;display:flex;flex-direction:column;border:1px solid rgba(42,54,42,.1);background:#e3e9df;color:#435744;transition:border-color .22s}
.cover:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:rgba(0,0,0,.07)}
/* 眉题：分类名 + 品牌名。分类名由 BOOK_CAT 决定，以后换书只改数据 */
.cover-kicker{font-size:7.5px;letter-spacing:1.3px;text-transform:uppercase;color:var(--sage)}
.cover-title{font:400 clamp(21px,2.1vw,26px)/1 var(--serif);letter-spacing:-.5px;
  margin:26px 0 0;max-width:98%;overflow-wrap:break-word}
.cover-subtitle{font-size:8px;line-height:1.5;opacity:.75;margin-top:11px;max-width:150px}
/* 中文封面副标题原来被 max-width:150px 挤到第二行，只剩「南。」一个字。
   中文不该这样折行：缩一号字、不折行、放宽宽度。其他语言文案长短差异大，保持可折行。 */
html[lang="zh-Hans"] .cover-subtitle,
html[lang="zh-Hant"] .cover-subtitle,
html[lang="ja"] .cover-subtitle{white-space:nowrap;max-width:none;letter-spacing:-.01em}
/* 封面下半部：一条通栏细线划出品牌区，左下角是站点 logo。
   细线与面包屑、meta 带、首页分区线同一套语言，留白因此是刻意的。 */
.cover-brand{width:100%;margin-top:auto;display:flex;align-items:center;gap:9px;
  border-top:1px solid rgba(67,87,68,.2);padding-top:13px}
.cover-logo{width:30px;height:30px;display:block;flex:0 0 auto}
.cover-name{display:flex;flex-direction:column;gap:3px;min-width:0}
.cover-name .en{font-size:6.5px;letter-spacing:1.25px;opacity:.7}
.cover-name .local{font-family:var(--sans);font-size:7.5px;line-height:1.25;letter-spacing:.04em;opacity:.62}
/* 汉字/假名/谚文拉开一点更好看；连写与元音附标文字不能拉字距，否则断字 */
html[lang="zh-Hans"] .cover-name .local,html[lang="zh-Hant"] .cover-name .local,
html[lang="ja"] .cover-name .local,html[lang="ko"] .cover-name .local{letter-spacing:.14em}
html[lang="ar"] .cover-name .local,html[lang="fa"] .cover-name .local,
html[lang="th"] .cover-name .local,html[lang="hi"] .cover-name .local{letter-spacing:0}
.empty{padding:28px 0;color:var(--muted);font-size:12px}

/* footer */
footer{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:11px}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:14px 28px;flex-wrap:wrap}
.footer-copy{white-space:nowrap}
.footer-links{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.footer-links a,.footer-copy a{transition:color .15s}
.footer-links a:hover,.footer-copy a:hover{color:var(--ink)}
.footer-copy a:hover{text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:3px}

/* legal pages */
/* 法务页：窄阅读栏 + 右侧随滚动固定的目录 */
.legal-layout{display:grid;grid-template-columns:minmax(0,1fr) 186px;gap:60px;
  align-items:start;padding:52px 0 84px}
.legal{max-width:700px}
/* 没有目录的短页面（联系我们、退款说明）：单栏居中 */
.legal-solo{grid-template-columns:minmax(0,700px);justify-content:center}

/* 付款成功页：每个语言一份，居中阅读栏，无目录、不索引 */
.thanks{padding:68px 0 96px;max-width:600px}
.thanks-mark{width:52px;height:52px;display:block;margin-bottom:28px}
.thanks-kicker{font:400 10px/1 var(--mono);letter-spacing:.2em;color:var(--sage);
  text-transform:uppercase;margin:0}
.thanks h1{font:400 clamp(26px,3.2vw,34px)/1.2 var(--serif);letter-spacing:-.7px;margin:14px 0 0}
.thanks-lede{font-size:14px;line-height:1.9;color:#6f776d;margin:22px 0 0}
.thanks-lede b{font-weight:500;color:var(--ink)}
.thanks-steps{margin:38px 0 0;padding:0;list-style:none;border-top:1px solid var(--line)}
.thanks-steps li{display:flex;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
.thanks-steps .n{font:400 10px/1 var(--mono);letter-spacing:.14em;color:var(--sage);
  padding-top:4px;flex:0 0 22px}
.thanks-steps .t{font-size:13px;line-height:1.85;color:#6f776d;margin:0;min-width:0}
.thanks-steps .t b{display:block;font:400 15px/1.5 var(--serif);color:var(--ink);margin-bottom:3px}
.thanks-steps a{color:var(--sage);border-bottom:1px solid rgba(99,122,102,.35)}
.thanks-steps a:hover{border-bottom-color:var(--sage)}
.thanks-actions{display:flex;flex-wrap:wrap;gap:10px;margin:34px 0 0}
.thanks-btn{display:inline-flex;align-items:center;justify-content:center;height:42px;
  padding:0 22px;border:1px solid var(--line);background:#fff;font-size:12.5px;
  letter-spacing:.02em;transition:border-color .18s,background .18s}
.thanks-btn:hover{border-color:rgba(42,54,42,.28)}
.thanks-btn.primary{background:var(--sage);border-color:var(--sage);color:#fff}
.thanks-btn.primary:hover{background:#566b59;border-color:#566b59}
.legal-head{padding-bottom:28px;border-bottom:1px solid var(--line)}
.legal-kicker{font:400 10px/1 var(--mono);letter-spacing:.2em;color:var(--sage);
  text-transform:uppercase;margin:0}
.legal h1{font:400 clamp(27px,3.2vw,34px)/1.18 var(--serif);letter-spacing:-.7px;margin:15px 0 0}
.legal-meta{font-size:10.5px;letter-spacing:.05em;color:#a5aba5;margin:13px 0 0;
  font-variant-numeric:tabular-nums}
.legal-intro{font-size:14px;line-height:1.9;color:#6f776d;margin:22px 0 0;max-width:560px}
.legal-body{padding-top:34px}
.legal-toc{position:sticky;top:86px}
.legal-toc ol{list-style:none;margin:0;padding:0 0 0 15px;border-left:1px solid var(--line);
  display:flex;flex-direction:column;gap:8px}
.legal-toc a{display:block;font-size:11.5px;line-height:1.5;color:#959c92;transition:color .15s}
.legal-toc a:hover{color:var(--ink)}
.legal .mail{display:inline-block;font:400 19px/1.5 var(--serif);color:var(--ink);margin:26px 0 0;
  padding-bottom:2px;border-bottom:1px solid var(--line);text-decoration:none;transition:border-color .15s}
.legal .mail:hover{border-bottom-color:var(--sage)}
.legal section{padding-top:30px}
.legal h2{font:400 16.5px/1.5 var(--serif);letter-spacing:-.2px;color:var(--ink);margin:0 0 8px}
.legal p{font-size:13.5px;line-height:1.9;color:#6f776d;margin:0 0 12px}
.legal section p:last-child{margin-bottom:0}
.legal a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:3px}
.legal a:hover{text-decoration-color:var(--sage)}

/* detail */
.detail{padding:44px 0 96px}
.back{display:inline-flex;align-items:center;gap:7px;margin:0 0 36px;color:var(--muted);font-size:12px;transition:color .15s}
.back:hover{color:var(--ink)}
.back .arrow{font-size:13px;line-height:1}
/* 面包屑：单独成条，下沿一条通栏细线 */
.crumbs{padding:16px 0 14px;border-bottom:1px solid var(--line);font-size:11.5px;line-height:1.6;letter-spacing:.01em}
.crumbs + .detail{padding-top:30px;padding-bottom:48px}
.crumbs + .tool{padding-top:30px}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:baseline;margin:0;padding:0;list-style:none}
.crumbs li{display:flex;align-items:baseline;min-width:0}
.crumbs li+li:before{content:"›";margin:0 9px;color:#c9cec4;flex:0 0 auto}
.crumbs a{color:#7c847a;transition:color .15s}
.crumbs a:hover{color:var(--ink)}
.crumbs .cur{color:#4f574e}
html[dir="rtl"] .crumbs li+li:before{content:"‹"}
.layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:76px;align-items:start}
.cover-wrap{position:sticky;top:32px}
.detail .cover{aspect-ratio:.705;padding:24px 22px 20px;box-shadow:0 10px 26px rgba(35,44,34,.06)}
.detail .cover:before{width:5px}
.detail .cover-kicker{font-size:9px;letter-spacing:1.5px}
.detail .cover-title{font-size:clamp(32px,3.4vw,40px);letter-spacing:-.9px;margin-top:34px;line-height:1}
.detail .cover-subtitle{font-size:9px;line-height:1.55;margin-top:13px;max-width:185px}
html[lang="zh-Hans"] .detail .cover-subtitle,
html[lang="zh-Hant"] .detail .cover-subtitle,
html[lang="ja"] .detail .cover-subtitle{white-space:nowrap;max-width:none;letter-spacing:-.01em}
.detail .cover-brand{gap:12px;padding-top:17px}
.detail .cover-logo{width:44px;height:44px}
.detail .cover-name{gap:5px}
.detail .cover-name .en{font-size:8px;letter-spacing:1.4px}
.detail .cover-name .local{font-size:10px;opacity:.62}
.copy{padding-top:6px}
.category{font-size:10px;letter-spacing:.03em;color:var(--sage);margin-bottom:16px}
.copy h1{font:400 clamp(30px,4.2vw,42px)/1.06 var(--serif);letter-spacing:-1.1px;margin:0 0 18px}
.description{font-size:13px;line-height:1.85;color:#6f776d;max-width:470px;margin:0}
.meta{display:flex;flex-wrap:wrap;align-items:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:15px 0;margin:30px 0 34px;color:#70786f;font-size:10.5px;letter-spacing:.02em}
.meta span{white-space:nowrap}
.meta span+span:before{content:"·";margin:0 12px;color:#c3c7bf}
/* 窄屏换行时圆点会掉到行首，改成纯间距，不再挂一个孤立的「·」 */
@media(max-width:640px){
  .meta{gap:5px 16px}
  .meta span+span:before{content:none}
}
.copy h2{font:400 18px var(--serif);letter-spacing:-.3px;margin:0 0 10px}
.contents{margin:0;padding:0;list-style:none;color:#747c72;font-size:12.5px}
.contents li{border-bottom:1px solid var(--line);padding:10px 0}
.contents li:first-child{border-top:1px solid var(--line)}
.purchase{display:inline-block;margin-top:34px;padding:13px 24px;background:var(--sage);color:#fff;font-size:12px;letter-spacing:.01em;border:0;cursor:pointer;transition:background .15s}
.purchase:hover:not(:disabled){background:#566b59}
.purchase:disabled{background:#e3e6df;color:#767d73;cursor:default}
.note{font-size:10.5px;color:var(--muted);margin:12px 0 0}
/* 价格：接在 .meta 下沿那条横线之后，做成一窄条规格行，左标签右数字。
   margin-top:-34px 用来抵掉 .meta 的下边距，让价格紧贴那条线，不再多画一条。 */
.price{display:flex;align-items:baseline;justify-content:space-between;
  margin:-34px 0 0;padding:13px 0 0}
.price .lbl{font-size:10.5px;letter-spacing:.02em;color:#70786f}
.price .amt{font:400 17px/1.15 var(--serif);letter-spacing:-.2px;color:var(--ink)}
.pay-note{font-size:10.5px;line-height:1.6;color:#858b82;margin:7px 0 0}
/* 购买 / 免费网页版：两枚等宽按钮，宽度与 .contents 的横线一致 */
.actions{display:flex;flex-direction:column;gap:9px;margin-top:22px}
.act{display:flex;align-items:center;justify-content:center;width:100%;padding:14px 18px;
  font-family:inherit;font-size:12.5px;letter-spacing:.01em;text-align:center;
  border:1px solid transparent;transition:background .15s,color .15s,border-color .15s}
.act-buy{background:var(--sage);border-color:var(--sage);color:#fff;cursor:pointer}
.act-buy:hover{background:#566b59;border-color:#566b59}
/* 未开卖的语言：主按钮灰掉，但保留与副按钮等宽的版式 */
.act-buy:disabled,.act-buy:disabled:hover{background:#e3e6df;border-color:#e3e6df;color:#767d73;cursor:default}
.act-free{background:transparent;border-color:#d5dacf;color:#5f675c}
.act-free:hover{border-color:var(--sage);color:var(--sage)}
/* 两栏下方：这本书里有什么 */
.more{padding-top:40px;padding-bottom:72px;border-top:1px solid var(--line)}
.more h2{font:400 18px var(--serif);letter-spacing:-.3px;margin:0}
.more .lede{font-size:13px;line-height:1.9;color:#6f776d;margin:12px 0 0;text-wrap:pretty}
.more-list{display:grid;grid-template-columns:1fr 1fr;gap:28px 60px;
  margin:26px 0 0;border-top:1px solid var(--line);padding-top:28px}
.mi{display:flex;gap:13px}
.mi .n{font-family:var(--mono);font-size:9.5px;letter-spacing:.06em;color:var(--sage);padding-top:3px;flex:0 0 auto}
.mi .t{font-size:13px;letter-spacing:.01em}
.mi .d{font-size:11.5px;line-height:1.75;color:#747c72;margin-top:4px;text-wrap:pretty}
/* 规格条：一项一格，细竖线分隔。比一条 mono 长串横穿整页稳，换行也不会参差 */
.more-spec{margin:44px 0 0;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.02em;color:#858b82}
/* 非官方声明：比规格行更淡，只做法律与出处说明，不抢视觉 */
.more-disc{margin:16px 0 0;font-size:10.5px;line-height:1.75;color:#a5aba5;max-width:640px}

/* rtl */
html[dir="rtl"] body{direction:rtl}
html[dir="rtl"] .lang-menu{right:auto;left:0}
html[dir="rtl"] .cover:before{left:auto;right:0}
html[dir="rtl"] .intro h1,html[dir="rtl"] .copy h1,html[dir="rtl"] .cover-title{font-family:var(--sans);letter-spacing:0}
html[dir="rtl"] .cover-title{line-height:1.2}
html[dir="rtl"] .copy h1{line-height:1.25}
html[dir="rtl"] .cover{text-align:right}
html[dir="rtl"] .cover-brand{flex-direction:row-reverse}
html[dir="rtl"] .cover-name{align-items:flex-end}

@media(max-width:900px){.book-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.layout{grid-template-columns:250px minmax(0,1fr);gap:48px}}
@media(max-width:900px){
  .legal-layout{grid-template-columns:1fr;padding:34px 0 64px}
  .legal-toc{display:none}
  .legal-body{padding-top:26px}
  .legal section{padding-top:26px}
  .thanks{padding:44px 0 64px}
  .thanks-steps li{gap:12px}
}
@media(max-width:760px){
  .wrap{width:calc(100% - 36px)}
  .home{padding:48px 0 64px}.intro{margin-bottom:32px}
  .book-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px 18px}
  /* 两列时每列只有 ~168px：名字与价格同时缩小，让书名尽量完整显示 */
  .book-meta{gap:7px;margin-top:9px}
  .book-name,.book-price{font-size:10.5px}
  .cover{padding:14px 13px 12px}.cover-title{font-size:21px;margin-top:20px}
  .cover-subtitle,.detail .cover-subtitle{font-size:7px}
  .cover-brand{gap:8px;padding-top:11px}
  .cover-logo,.detail .cover-logo{width:26px;height:26px}
  .cover-name{gap:2px}
  .cover-name .local,.detail .cover-name .local{font-size:7px}
  .detail .cover-brand{gap:9px;padding-top:12px}
  .detail .cover-name .en{font-size:7px}
  .categories{gap:18px}
  .detail{padding:32px 0 64px}.back{margin-bottom:26px}
  .crumbs{padding:14px 0 12px}
  .crumbs + .detail{padding-top:24px;padding-bottom:40px}
  .crumbs + .tool{padding-top:24px}
  .layout{grid-template-columns:1fr;gap:36px}
  .cover-wrap{position:static;max-width:240px}
  .copy{padding-top:0}.meta{margin:26px 0 30px}
  .more{padding-top:32px;padding-bottom:64px}
  .more-list{grid-template-columns:1fr;gap:22px;margin-top:22px;padding-top:22px}
  .more-spec{margin-top:34px;padding:16px 0;font-size:10px}
  .legal{padding:40px 0 60px}
}
@media(max-width:430px){
  .brand{font-size:16.5px}.brand-logo{width:24px;height:24px;flex-basis:24px}
  .lang-button{font-size:11px}
  .book-grid{gap:26px 12px}.cover-title{font-size:18px}
  .categories{gap:14px}.categories button{font-size:11px}
  .footer-links{gap:18px}
}

/* 卡组横条：只讲「这本书里是一张张卡」，不放文字内容 */
.cardstrip{margin:34px 0 0}
.cardstrip svg{display:block;width:100%;height:auto}
.cardstrip .cs{fill:#fff;stroke:#e0e3db;stroke-width:1}
.cardstrip-labels{display:grid;grid-template-columns:repeat(5,1fr);gap:3%;margin-top:12px}
.cardstrip-labels span{font-size:11px;line-height:1.45;color:#8a918a;text-align:center;
  letter-spacing:.02em;text-wrap:balance}