/* ============================================================================
   吉速力 JISULI 官网 —— 站点样式（由 design/mockup.html 的设计稿样式拆出）
   设计基准：1440×900；断点 1200 / 992 / 768 / 480
   色板与字阶见 design/design-spec.md（与 docs/design-brief.md §6 对齐）
   ========================================================================== */

:root{
  /* 深空区 */
  --space-950:#05070F;
  --space-900:#0A1020;
  --space-800:#101829;
  /* 品牌 */
  --brand-600:#5A3BE8;
  --brand-500:#6C4CFF;
  --brand-400:#8A6BFF;
  --accent-400:#21D4FD;
  --brand-gradient:linear-gradient(135deg,#6C4CFF 0%,#21D4FD 100%);
  /* 浅色区 */
  --paper:#FFFFFF;
  --paper-alt:#F6F8FC;
  --line:#E4E9F2;
  --line-strong:#D3DBE8;
  --ink:#0D1322;
  --ink-2:#5B6478;
  --ink-3:#68718A;   /* F6：实测 4.86:1（白）/ 4.57:1（#F6F8FC） */
  /* 深色区文字 */
  --text-dark:#EAF0FF;
  --text-dark-2:#9AA6C0;
  --line-dark:rgba(255,255,255,.10);
  /* 其他 */
  --warm:#FFB86B;
  --glow:0 0 32px rgba(33,212,253,.18);
  --shadow-card:0 8px 24px rgba(13,19,34,.06);
  --shadow-hover:0 14px 34px rgba(13,19,34,.10);
  --radius-card:12px;
  --radius-panel:16px;
  --container:1200px;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --ease-out:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
section[id],footer[id]{scroll-margin-top:88px}
html,body{margin:0}
body{
  background:var(--paper);color:var(--ink);font-family:var(--font);
  font-size:16px;line-height:1.9;-webkit-font-smoothing:antialiased;
}
body.is-locked{overflow:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
:focus-visible{outline:2px solid var(--accent-400);outline-offset:2px}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------------------------------------------------------------- 布局工具 */
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:120px 0}
.section--alt{background:var(--paper-alt)}
.section--tight{padding:96px 0}
.eyebrow{
  font-size:12px;font-weight:500;letter-spacing:.22em;text-transform:uppercase;
  color:var(--brand-500);margin-bottom:14px;
}
.eyebrow--light{color:var(--accent-400)}
.section-title{font-size:clamp(30px,4vw,44px);font-weight:700;line-height:1.2;letter-spacing:-.01em;color:var(--ink)}
.section-lead{margin-top:18px;max-width:720px;color:var(--ink-2);font-size:16px;line-height:1.85}
.sec-head{display:flex;flex-direction:column;align-items:center;text-align:center;margin-bottom:56px}
.sec-head .section-lead{margin-left:auto;margin-right:auto}

/* ---------------------------------------------------------------- 导航 */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;height:72px;
  display:flex;align-items:center;
  transition:background .2s linear,border-color .2s linear,backdrop-filter .2s linear;
  border-bottom:1px solid transparent;
}
.nav__inner{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.nav__brand{display:flex;align-items:center;gap:10px}
.nav__brand svg{display:block;height:32px;width:auto}
.nav__links{display:flex;align-items:center;gap:30px}
.nav__link{
  position:relative;font-size:14px;color:rgba(234,240,255,.74);
  padding:6px 0;transition:color .16s ease;cursor:pointer;
}
.nav__link:hover{color:#fff}
.nav__link[aria-current="true"]{color:#fff}
.nav__link[aria-current="true"]::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;border-radius:2px;
  background:var(--brand-gradient);
}
.nav__right{display:flex;align-items:center;gap:18px}
.lang{display:flex;align-items:center;gap:2px;padding:3px;border:1px solid rgba(255,255,255,.16);border-radius:999px}
.lang button{
  font-size:11px;letter-spacing:.08em;color:rgba(234,240,255,.62);
  background:none;border:0;border-radius:999px;padding:4px 10px;cursor:pointer;
}
.lang button[aria-pressed="true"]{background:rgba(255,255,255,.94);color:#0B1020;font-weight:600}
.nav.is-solid{
  background:rgba(5,7,15,.72);border-bottom-color:var(--line-dark);
  backdrop-filter:blur(12px) saturate(140%);
}
@supports not (backdrop-filter:blur(1px)){.nav.is-solid{background:var(--space-900)}}
.nav__burger{
  display:none;width:44px;height:44px;align-items:center;justify-content:center;
  background:none;border:0;cursor:pointer;color:#fff;
}
.nav__burger svg{width:22px;height:22px}

/* 移动抽屉 */
.drawer{
  position:fixed;inset:0;z-index:70;display:none;background:rgba(5,7,15,.98);
  padding:96px 24px 40px;
}
.drawer.is-open{display:block}
.drawer__link{display:block;padding:16px 0;font-size:20px;color:var(--text-dark);border-bottom:1px solid var(--line-dark)}
.drawer__close{position:absolute;top:22px;right:18px;width:44px;height:44px;background:none;border:0;color:#fff;cursor:pointer}

/* ---------------------------------------------------------------- 首屏 */
.hero{position:relative;min-height:100vh;min-height:100svh;overflow:hidden;background:var(--space-950)}
.hero__canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero__scrim{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(ellipse 62% 46% at 50% 46%, rgba(5,7,15,.60) 0%, rgba(5,7,15,.34) 58%, rgba(5,7,15,0) 100%),
    radial-gradient(ellipse 92% 74% at 50% 44%, rgba(5,7,15,0) 0%, rgba(5,7,15,.40) 58%, rgba(5,7,15,.88) 100%),
    linear-gradient(180deg, rgba(5,7,15,.86) 0%, rgba(5,7,15,.16) 26%, rgba(5,7,15,.28) 60%, rgba(5,7,15,.94) 100%);
}
.hero__content{
  position:relative;z-index:2;min-height:100vh;min-height:100svh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:120px 24px 150px;
}
.hero h1.hero__title{
  font-size:clamp(26px,4.8vw,72px);font-weight:700;line-height:1.16;letter-spacing:.02em;
  color:#F6F9FF;text-wrap:balance;max-width:22ch;
}
html[data-lang="en"] .hero h1.hero__title{
  font-size:clamp(22px,3vw,44px);line-height:1.26;letter-spacing:-.01em;max-width:24ch;
}
.hero__tagline{
  margin-top:22px;font-size:clamp(15px,1.7vw,24px);letter-spacing:.16em;
  color:rgba(234,240,255,.72);
}
html[data-lang="en"] .hero__tagline{font-size:clamp(14px,1.3vw,18px);letter-spacing:.04em}

.hero__arrow{
  position:absolute;left:50%;bottom:44px;transform:translateX(-50%);
  width:44px;height:44px;display:flex;align-items:center;justify-content:center;
  color:rgba(255,255,255,.7);animation:float 2s ease-in-out infinite;z-index:3;
}
.hero__arrow svg{width:18px;height:18px}
@keyframes float{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,6px)}}
.hero__pause{
  position:absolute;right:24px;bottom:24px;z-index:3;width:44px;height:44px;
  display:flex;align-items:center;justify-content:center;border-radius:50%;
  background:rgba(10,16,32,.55);border:1px solid var(--line-dark);color:rgba(255,255,255,.8);
  cursor:pointer;backdrop-filter:blur(8px);
}
.hero__pause:hover{color:#fff;border-color:rgba(255,255,255,.28)}
.hero__pause[hidden]{display:none}
.hero__media{position:absolute;inset:0}
.hero__poster{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero__poster[hidden]{display:none}
.hero__pause svg{width:18px;height:18px}
.hero__scroll-hint{position:absolute;left:50%;bottom:96px;transform:translateX(-50%);font-size:11px;letter-spacing:.2em;color:rgba(154,166,192,.6);display:none}

/* ---------------------------------------------------------------- S2 公司简介 */
.about__body{max-width:880px;margin:0 auto}
.about__body p{font-size:16px;line-height:1.95;color:var(--ink-2)}
.about__body p + p{margin-top:24px}
.about__marks{display:flex;justify-content:center;gap:56px;margin-top:56px;flex-wrap:wrap}
.about__mark{display:flex;flex-direction:column;align-items:center;gap:6px;min-width:150px}
.about__mark b{font-size:15px;font-weight:600;color:var(--ink)}
.about__mark span{font-size:12.5px;color:var(--ink-3);letter-spacing:.04em}
.about__mark i{
  display:block;width:34px;height:2px;border-radius:2px;background:var(--brand-gradient);margin-bottom:12px;
}

/* ---------------------------------------------------------------- S3 业务范畴 */
.biz{display:grid;grid-template-columns:1.22fr 1fr;gap:56px;align-items:center;touch-action:pan-y}
.biz__visual{
  position:relative;border-radius:var(--radius-panel);overflow:hidden;
  background:radial-gradient(120% 120% at 30% 20%,#141C33 0%,#0A1020 60%,#070B16 100%);
  aspect-ratio:16/9;border:1px solid rgba(255,255,255,.08);
}
.biz__visual svg{position:absolute;inset:0;width:100%;height:100%}
.biz__art{position:absolute;inset:0;opacity:0;transition:opacity .36s ease;pointer-events:none}
.biz__art.is-active{opacity:1}
.biz__art svg{position:absolute;inset:0;width:100%;height:100%}
.biz__panel{display:grid;grid-template-columns:1fr;grid-template-rows:auto auto;min-height:300px}
.biz__slide{grid-column:1;grid-row:1;opacity:0;transition:opacity .36s ease;pointer-events:none}
.biz__slide.is-active{opacity:1;pointer-events:auto}
.biz__controls{grid-column:1;grid-row:2}
.biz__abbr{font-size:48px;font-weight:700;line-height:1;letter-spacing:-.02em;color:var(--ink)}
.biz__abbr span{background:var(--brand-gradient);-webkit-background-clip:text;background-clip:text;color:transparent}
.biz__full{margin-top:10px;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3)}
.biz__desc{margin-top:20px;font-size:16px;line-height:1.85;color:var(--ink-2)}
.biz__controls{display:flex;align-items:center;gap:18px;margin-top:32px}
.biz__btn{
  width:44px;height:44px;border-radius:50%;border:1px solid var(--line-strong);background:#fff;
  display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--ink);
  transition:border-color .16s ease,color .16s ease,transform .16s ease;
}
.biz__btn:hover{border-color:var(--brand-500);color:var(--brand-500)}
.biz__btn:active{transform:scale(.98)}
.biz__btn svg{width:16px;height:16px}
.biz__dots{display:flex;gap:8px}
.biz__dot{
  width:24px;height:24px;border:0;background:none;padding:0;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
}
.biz__dot i{display:block;width:8px;height:8px;border-radius:50%;background:var(--line-strong);transition:background .2s ease,width .2s ease}
.biz__dot[aria-current="true"] i{width:22px;border-radius:4px;background:var(--brand-gradient)}
.biz__count{font-family:var(--mono);font-size:12px;color:var(--ink-3);letter-spacing:.08em}

/* ---------------------------------------------------------------- 卡片网格 */
.grid{display:grid;gap:20px}
.grid--4{grid-template-columns:repeat(4,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
.card{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
  padding:28px 24px;transition:box-shadow .18s ease,transform .18s ease,border-color .18s ease;
}
.card::before{
  content:"";position:absolute;inset:-1px;border-radius:inherit;padding:1px;
  background:var(--brand-gradient);opacity:0;transition:opacity .18s ease;
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;
}
.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.card:hover::before{opacity:1}
.card__icon{width:44px;height:44px;display:flex;align-items:center;justify-content:center;color:var(--brand-500);margin-bottom:18px}
.card__icon svg{width:26px;height:26px;stroke-width:1.75}
.card__title{font-size:18px;font-weight:600;line-height:1.4;color:var(--ink)}
.card__en{margin-top:4px;font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3)}
.card__text{margin-top:12px;font-size:14px;line-height:1.8;color:var(--ink-2)}

.card--tech{padding:32px 26px}
.card--tech .card__icon{width:56px;height:56px;border-radius:14px;background:rgba(108,76,255,.08);color:var(--brand-500);margin-bottom:20px}
.card--tech .card__icon svg{width:40px;height:40px}

/* ---------------------------------------------------------------- S6 漏斗 */
.funnel{display:flex;flex-direction:column;gap:14px;max-width:1000px;margin:0 auto}
.funnel__row{display:grid;grid-template-columns:64px 1fr;gap:20px;align-items:center}
.funnel__idx{font-family:var(--mono);font-size:13px;color:var(--ink-3);letter-spacing:.06em;text-align:right}
.funnel__bar{
  position:relative;height:84px;border-radius:10px;overflow:hidden;
  display:flex;align-items:center;justify-content:space-between;padding:0 24px;
  border:1px solid var(--line);background:#fff;
}
.funnel__fill{
  position:absolute;inset:0;transform-origin:left center;border-radius:9px;
  background:linear-gradient(90deg,rgba(108,76,255,.16),rgba(33,212,253,.16));
  border-right:1px solid rgba(108,76,255,.28);
}
.funnel__row:nth-child(1) .funnel__fill{width:100%}
.funnel__row:nth-child(2) .funnel__fill{width:78%}
.funnel__row:nth-child(3) .funnel__fill{width:56%}
.funnel__row:nth-child(4) .funnel__fill{width:36%}
.funnel__label{position:relative;display:flex;align-items:baseline;gap:12px}
.funnel__label b{font-size:19px;font-weight:600;color:var(--ink)}
.funnel__label span{font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3)}
.funnel__note{position:relative;font-size:13px;color:var(--ink-3)}

/* ---------------------------------------------------------------- S7 客户 */
.tabs{display:flex;gap:8px;justify-content:center;margin-bottom:36px}
.tab{
  padding:10px 22px;border-radius:999px;border:1px solid var(--line);background:#fff;
  font-size:14px;color:var(--ink-2);cursor:pointer;transition:all .18s ease;
}
.tab[aria-selected="true"]{background:var(--ink);border-color:var(--ink);color:#fff;box-shadow:var(--shadow-card)}
.tab:hover{border-color:var(--line-strong)}
.logo-stack{display:grid;grid-template-columns:1fr;grid-template-rows:auto}
.logo-stack > .logos{grid-area:1/1;align-content:start}
.logos{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.logos[data-active="false"]{visibility:hidden;pointer-events:none}
.logos[hidden]{display:none}
.logo-card{
  background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 12px 14px;
  display:flex;flex-direction:column;align-items:center;gap:10px;transition:box-shadow .18s ease,border-color .18s ease;
}
.logo-card:hover{box-shadow:var(--shadow-card);border-color:var(--line-strong)}
.logo-card img{height:40px;width:auto;max-width:100%;object-fit:contain}
.logo-card span{font-size:12px;color:var(--ink-3);text-align:center;line-height:1.35;min-height:16px}
.panel[hidden]{display:none}

/* ---------------------------------------------------------------- S8 优势 */
.adv{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.adv__card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:32px 24px;transition:box-shadow .18s ease,transform .18s ease}
.adv__card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.adv__icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:rgba(33,212,253,.10);color:var(--brand-600);margin-bottom:22px}
.adv__icon svg{width:30px;height:30px}
.adv__card h3{font-size:19px;font-weight:600;color:var(--ink)}
.adv__card p{margin-top:10px;font-size:14px;line-height:1.85;color:var(--ink-2)}

/* ---------------------------------------------------------------- S9 联系 */
.contact{background:var(--space-950);padding:120px 0}
.contact__card{
  position:relative;overflow:hidden;border-radius:var(--radius-panel);
  border:1px solid var(--line-dark);background:
    radial-gradient(90% 120% at 12% 0%, rgba(108,76,255,.24) 0%, rgba(10,16,32,0) 62%),
    radial-gradient(70% 100% at 88% 100%, rgba(33,212,253,.16) 0%, rgba(10,16,32,0) 60%),
    var(--space-900);
  padding:64px 56px;
}
.contact__grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center;position:relative;z-index:1}
.contact h2{font-size:clamp(30px,3.6vw,42px);font-weight:700;line-height:1.2;color:var(--text-dark)}
.contact__lead{margin-top:18px;color:var(--text-dark-2);font-size:15px;line-height:1.85;max-width:420px}
.contact__rows{display:flex;flex-direction:column;gap:22px}
.contact__row{display:flex;flex-direction:column;gap:6px}
.contact__row dt{font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:rgba(154,166,192,.8)}
.contact__row dd{font-size:18px;color:var(--text-dark)}
.contact__row dd.big{font-size:clamp(24px,2.4vw,32px);font-weight:700;letter-spacing:.02em;font-variant-numeric:tabular-nums}
.contact a{transition:color .16s ease}
.contact a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--accent-400);text-underline-offset:4px}

/* ---------------------------------------------------------------- 页脚 */
.footer{background:#05070F;padding:72px 0 44px;border-top:1px solid var(--line-dark)}
.footer__top{display:flex;justify-content:space-between;align-items:flex-start;gap:40px;flex-wrap:wrap}
.footer__brand svg{display:block;height:36px;width:auto}
.footer__name{margin-top:18px;font-size:14px;color:var(--text-dark)}
.footer__en{margin-top:4px;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:rgba(154,166,192,.8)}
.footer__meta{display:flex;flex-direction:column;gap:8px;align-items:flex-end;text-align:right}
.footer__meta p{font-size:12.5px;color:rgba(154,166,192,.75)}
.footer__meta .beian{font-size:12px;color:rgba(154,166,192,.62);font-variant-numeric:tabular-nums;word-break:break-all}
.footer__meta .beian[hidden]{display:none}
.footer__meta .beian a{color:inherit;text-decoration:none;border-bottom:1px solid transparent;transition:border-color .16s ease,color .16s ease}
.footer__meta .beian a:hover{color:var(--text-dark);border-bottom-color:rgba(154,166,192,.7)}
.footer__meta .beian a:focus-visible{outline:2px solid var(--accent-400);outline-offset:2px;border-radius:2px}
.footer__bottom{margin-top:44px;padding-top:22px;border-top:1px solid var(--line-dark);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer__bottom p{font-size:12px;color:rgba(154,166,192,.62)}

/* ---------------------------------------------------------------- 入场动效 */
.reveal{transition:opacity .42s var(--ease-out),transform .42s var(--ease-out)}
.js .reveal{opacity:0;transform:translateY(16px)}
.js .reveal.is-in{opacity:1;transform:none}

/* ---------------------------------------------------------------- 响应式 */
@media (max-width:1200px){
  :root{--container:1120px}
  .nav__links{gap:22px}
  .logos{grid-template-columns:repeat(5,1fr)}
}
/* 英文模式下隐藏重复的英文副标（同一语言不重复出现） */
html[data-lang="en"] .card__en,
html[data-lang="en"] .about__mark span,
html[data-lang="en"] .funnel__label span{display:none}
/* F17/F16：英文态 .eyebrow 与 h2 重复、hero kicker 与英文 h1 逐字重复 → 用 visibility 隐藏，保留占位不塌高 */
html[data-lang="en"] .eyebrow{visibility:hidden}

@media (max-width:992px){
  .section{padding:96px 0}
  .biz{grid-template-columns:1fr;gap:36px}
  .biz__panel{min-height:0}
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(2,1fr)}
  .adv{grid-template-columns:repeat(2,1fr)}
  .logos{grid-template-columns:repeat(4,1fr)}
  .contact__grid{grid-template-columns:1fr;gap:36px}
  .contact__card{padding:48px 32px}
  .nav__links{display:none}
  .nav__burger{display:flex}
}
@media (max-width:768px){
  body{font-size:15px}
  .nav{height:60px}
  section[id]{scroll-margin-top:76px}
  .section{padding:72px 0}
  .container{padding:0 20px}
  .grid--4,.grid--3,.adv{grid-template-columns:1fr}
  .logos{grid-template-columns:repeat(3,1fr);gap:10px}
  .hero__content{padding:104px 20px 140px}
  .hero h1{font-size:clamp(38px,10vw,52px)}
  .contact__card{padding:36px 22px}
  .footer__meta{align-items:flex-start;text-align:left}
  .funnel__row{grid-template-columns:36px 1fr;gap:12px}
  .funnel__bar{height:72px;padding:0 16px}
  .footer{padding:56px 0 36px}
}
@media (max-width:480px){
  .biz__abbr{font-size:40px}
  .hero__tagline{letter-spacing:.12em}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hero__arrow{animation:none}
  .js .reveal{opacity:1;transform:none;transition:none}
  .card,.adv__card,.logo-card{transition:none}
  .biz__slide{transition:none}
}
@media print{
  .nav,.drawer,.hero__canvas,.hero__scrim,.hero__pause{display:none}
  .section{padding:24px 0}
  .card{break-inside:avoid}
}


/* ============================================================================
   生产化补充（不属于设计稿原样式；原因见 site/README.md）
   ========================================================================== */
.skip{
  position:fixed;left:12px;top:-72px;z-index:99;padding:10px 16px;border-radius:8px;
  background:#fff;color:var(--ink);font-size:14px;font-weight:600;
  box-shadow:0 8px 24px rgba(13,19,34,.18);transition:top .16s var(--ease-out);
}
.skip:focus{top:12px}
.section-title{text-wrap:balance}
/* 首屏视频插槽样式位（当前不加载、不渲染；启用时把 data-hero-media 改为 video） */
.hero__video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.hero__video[hidden]{display:none}
/* 首屏标题与副标语在极窄屏留足换行余量，避免任何横向溢出 */
.hero__content{max-width:100%}
.hero h1.hero__title{overflow-wrap:anywhere}
/* 英文态首屏英文 slogan 的语义断行 */
html[data-lang="en"] .hero h1.hero__title{text-wrap:balance}
/* 语言切换：视觉宽度保持设计稿（28–34px），可点热区补到 44×44（brief §5.8 / WCAG 2.5.8）
   两个按钮各自以内侧边缘为锚点向外扩，热区互不重叠；中间 2px 间隙由后一个按钮的 -2px 覆盖 */
.lang button{position:relative}
.lang button::after{content:"";position:absolute;top:50%;width:44px;height:44px;transform:translateY(-50%)}
.lang button:first-child::after{right:0}
.lang button:last-child::after{left:-2px}
@media (max-width:992px){
  .lang{padding:4px}
  .lang button{padding:6px 12px}
}
@media print{
  .skip{display:none}
}