/* ==========================================================================
   PianoAIS — 样式表
   依据 2026-10-15 版英文画册（PDF）重建：配色与字体均取自该文件本身
   navy #0A3A70 · blue #0080C4 · light blue #7CBCE0 · gold #D9B31A
   正文 Lato · 标题 Playfair Display · 地址/页脚 Times（与画册一致）
   移动端优先：手机 → 640 → 900 → 1200
   ========================================================================== */

/* ---------- 字体（本地，不依赖外部网络） ---------- */
@font-face{font-family:'Playfair Display';src:url('../assets/fonts/PlayfairDisplay-400.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Playfair Display';src:url('../assets/fonts/PlayfairDisplay-400i.woff2') format('woff2');font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:'Playfair Display';src:url('../assets/fonts/PlayfairDisplay-600.woff2') format('woff2');font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:'Playfair Display';src:url('../assets/fonts/PlayfairDisplay-600i.woff2') format('woff2');font-weight:600;font-style:italic;font-display:swap}
@font-face{font-family:'Playfair Display';src:url('../assets/fonts/PlayfairDisplay-700.woff2') format('woff2');font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:'Lato';src:url('../assets/fonts/Lato-400.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Lato';src:url('../assets/fonts/Lato-400i.woff2') format('woff2');font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:'Lato';src:url('../assets/fonts/Lato-700.woff2') format('woff2');font-weight:700;font-style:normal;font-display:swap}

/* ---------- 设计变量 ---------- */
:root{
  --navy:#0A3A70;
  --navy-deep:#083B75;
  --blue:#0080C4;
  --blue-light:#7CBCE0;
  --gold:#D9B31A;
  --ink:#52514B;
  --muted:#8A857D;
  --line:#E2E9F0;
  --card-bg:#F5F8FB;
  --white:#fff;
  --serif:'Playfair Display',Georgia,'Times New Roman',serif;
  --sans:'Lato',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --roman:'Times New Roman',Times,Georgia,serif;
  --cn-serif:'Songti SC','Noto Serif SC',SimSun,var(--serif);
  --cn-sans:'PingFang SC','Microsoft YaHei',var(--sans);
  --wrap:1080px;
  --radius:16px;
  --shadow:0 10px 30px rgba(10,58,112,.07);
}

/* ---------- 基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--white);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
html[lang^="zh"] body{font-family:var(--cn-sans)}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy);text-decoration:none}
a:hover{color:var(--blue)}
h1,h2,h3,h4{font-family:var(--serif);color:var(--navy);margin:0;line-height:1.2;font-weight:700}
html[lang^="zh"] h1,html[lang^="zh"] h2,html[lang^="zh"] h3,html[lang^="zh"] h4{font-family:var(--cn-serif);font-weight:700}
p{margin:0 0 1em}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:var(--navy);color:#fff;padding:10px 16px;border-radius:8px;z-index:99}

/* ---------- 顶栏 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
}
.site-header__inner{display:flex;align-items:center;justify-content:space-between;gap:12px;height:64px}
.brand{display:flex;flex-direction:column;align-items:flex-start;justify-content:center;gap:2px;min-width:0;flex:0 0 auto}
.brand img{height:26px;width:auto;flex:none}
.brand__tag{display:none;font-family:var(--romans,var(--serif));font-style:italic;font-size:11px;line-height:1.1;color:var(--blue);white-space:nowrap;flex:none}
.nav{display:none}
.nav a{
  font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--navy);padding:6px 2px;position:relative;font-weight:700;
}
.nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--blue);transform:scaleX(0);transition:transform .25s}
.nav a:hover::after,.nav a[aria-current="page"]::after{transform:scaleX(1)}
.header__tools{display:flex;align-items:center;gap:10px}
.lang{
  display:inline-flex;align-items:center;gap:6px;
  border:1.5px solid #a9bccf;border-radius:999px;padding:7px 14px;
  font-size:12px;font-weight:700;letter-spacing:.06em;color:var(--navy);
  background:linear-gradient(180deg,#ffffff 0%,#d7e2ee 100%);
  box-shadow:0 5px 0 0 #8fa5bc,0 9px 14px rgba(4,58,120,.38),inset 0 2px 0 0 rgba(255,255,255,.95);
  transition:transform .1s ease,box-shadow .1s ease,border-color .2s,color .2s;
}
.lang:hover{
  border-color:var(--blue);color:var(--blue);transform:translateY(-1px);
  box-shadow:0 6px 0 0 #8fa5bc,0 11px 16px rgba(4,58,120,.42),inset 0 2px 0 0 rgba(255,255,255,.95);
}
.lang:active{
  transform:translateY(4px);
  box-shadow:0 1px 0 0 #8fa5bc,0 2px 4px rgba(4,58,120,.28),inset 0 2px 5px rgba(4,58,120,.22);
}
.burger{
  width:44px;height:40px;border:1.5px solid #a9bccf;border-radius:11px;
  background:linear-gradient(180deg,#ffffff 0%,#d7e2ee 100%);
  box-shadow:0 5px 0 0 #8fa5bc,0 9px 14px rgba(4,58,120,.38),inset 0 2px 0 0 rgba(255,255,255,.95);
  display:flex;flex-direction:column;justify-content:center;align-items:center;gap:4px;cursor:pointer;
  transition:transform .1s ease,box-shadow .1s ease;
}
.burger:active{
  transform:translateY(4px);
  box-shadow:0 1px 0 0 #8fa5bc,0 2px 4px rgba(4,58,120,.28),inset 0 2px 5px rgba(4,58,120,.22);
}
.burger span{display:block;width:18px;height:2px;background:var(--navy);border-radius:2px;transition:transform .25s,opacity .2s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.drawer{
  display:none;border-top:1px solid var(--line);background:#fff;
}
.drawer[data-open="true"]{display:block}
.drawer a{
  display:block;padding:15px 20px;border-bottom:1px solid var(--line);
  font-size:15px;font-weight:700;color:var(--navy);letter-spacing:.04em;
}
.drawer a[aria-current="page"]{color:var(--blue);background:var(--card-bg)}

/* ---------- 页头（内页） ---------- */
.page-head{padding:34px 0 8px}
.eyebrow{
  font-family:var(--serif);font-style:italic;color:var(--blue);
  font-size:17px;margin:0 0 2px;
}
html[lang^="zh"] .eyebrow{font-family:var(--cn-serif)}
.page-head h1{font-size:clamp(30px,7.6vw,52px);letter-spacing:-.01em}
.page-head__row{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:10px}
.tagline{
  font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);
  font-weight:700;white-space:nowrap;padding-bottom:10px;
}
.head-rule{height:1px;background:var(--line);margin:16px 0 0}

/* ---------- 封面 hero ---------- */
.hero{padding:26px 0 0;text-align:center}
.hero__logo{width:clamp(200px,52vw,300px);height:auto;margin:0 auto 6px}
.hero__tag{
  font-family:var(--serif);font-style:italic;color:var(--navy);
  font-size:clamp(13px,3.4vw,17px);display:flex;align-items:center;justify-content:center;gap:12px;
}
.hero__tag::before,.hero__tag::after{content:"";height:1px;width:clamp(28px,8vw,64px);background:#C9D6E4}
.hero__rule{height:5px;background:var(--gold);border-radius:2px;margin:20px 0 0}
.hero__photo{width:100%;margin:0}
.hero__photo img{width:100%;height:auto}
.hero__titles{padding:26px 20px 6px}
.hero h1{font-size:clamp(27px,7.2vw,52px);letter-spacing:-.01em}
.hero__sub{font-size:clamp(17px,4.6vw,26px);color:var(--blue);font-weight:400;margin:8px 0 0}
.hero__sub,.hero__tag{font-family:var(--serif)}
.hero__actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;padding:22px 20px 0}

/* ---------- 立体按钮（3D 凸起 / 按压下沉） ---------- */
.btn{
  --btn-face:var(--navy);
  --btn-depth:#021F42;
  --btn-top-light:rgba(255,255,255,.28);
  position:relative;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:50px;
  padding:0 26px;border-radius:999px;font-size:14px;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;
  border:1.5px solid var(--navy);
  color:var(--navy);
  background:linear-gradient(180deg,#ffffff 0%,#eef3f9 100%);
  box-shadow:
    0 5px 0 0 #c3d0de,
    0 8px 14px rgba(4,58,120,.22),
    inset 0 2px 0 0 var(--btn-top-light),
    inset 0 -2px 3px rgba(4,58,120,.10);
  transition:transform .10s ease, box-shadow .10s ease, background .22s, color .22s, border-color .22s;
  transform:translateY(0);
  will-change:transform;
}
.btn:hover{
  background:linear-gradient(180deg,#f4f8fd 0%,#dfe9f5 100%);
  color:var(--navy);
  transform:translateY(-2px);
  box-shadow:
    0 7px 0 0 #c3d0de,
    0 12px 18px rgba(4,58,120,.26),
    inset 0 2px 0 0 var(--btn-top-light),
    inset 0 -2px 3px rgba(4,58,120,.10);
}
.btn:active{
  transform:translateY(4px);
  box-shadow:
    0 1px 0 0 #c3d0de,
    0 2px 4px rgba(4,58,120,.22),
    inset 0 2px 6px rgba(4,58,120,.22);
}
.btn:focus-visible{outline:3px solid var(--blue);outline-offset:3px}

.btn--solid{
  color:#fff;
  border-color:var(--navy);
  background:linear-gradient(180deg,#0B4E96 0%,#01305F 100%);
  box-shadow:
    0 5px 0 0 #011A38,
    0 8px 16px rgba(4,58,120,.38),
    inset 0 2px 0 0 rgba(255,255,255,.32),
    inset 0 -2px 4px rgba(0,0,0,.22);
}
.btn--solid:hover{
  border-color:var(--blue);
  background:linear-gradient(180deg,#0C86D6 0%,#0A62A8 100%);
  color:#fff;
  transform:translateY(-2px);
  box-shadow:
    0 7px 0 0 #0A4E86,
    0 12px 20px rgba(4,58,120,.42),
    inset 0 2px 0 0 rgba(255,255,255,.38),
    inset 0 -2px 4px rgba(0,0,0,.20);
}
.btn--solid:active{
  transform:translateY(4px);
  box-shadow:
    0 1px 0 0 #011A38,
    0 2px 5px rgba(4,58,120,.34),
    inset 0 3px 7px rgba(0,0,0,.30);
}

.btn--ghost{
  border-color:var(--line);
  color:var(--navy);
  background:linear-gradient(180deg,#ffffff 0%,#f2f5f9 100%);
  box-shadow:
    0 5px 0 0 #d6dde5,
    0 8px 14px rgba(4,58,120,.14),
    inset 0 2px 0 0 rgba(255,255,255,.6),
    inset 0 -2px 3px rgba(4,58,120,.07);
}
.btn--ghost:hover{
  border-color:var(--line);
  background:linear-gradient(180deg,#ffffff 0%,#e9eff6 100%);
  transform:translateY(-2px);
  box-shadow:
    0 7px 0 0 #d6dde5,
    0 12px 18px rgba(4,58,120,.18),
    inset 0 2px 0 0 rgba(255,255,255,.6),
    inset 0 -2px 3px rgba(4,58,120,.07);
}
.btn--ghost:active{
  transform:translateY(4px);
  box-shadow:
    0 1px 0 0 #d6dde5,
    0 2px 5px rgba(4,58,120,.16),
    inset 0 3px 6px rgba(4,58,120,.16);
}

/* ---------- 通用区块 ---------- */
.section{padding:44px 0}
.section--tight{padding:30px 0}
.section__head{margin:0 0 22px;text-align:center}
.section__head h2{font-size:clamp(22px,5.4vw,34px)}
.section__head .eyebrow{font-size:16px;margin-bottom:4px}
.lede{font-size:17px;max-width:62ch;margin:0 auto;text-align:center}
.lede--left{margin:0;text-align:left}

/* 引语块（画册 p1） */
.quote{
  border-left:3px solid var(--blue);padding:4px 0 4px 18px;margin:26px 0;
  font-family:var(--serif);color:var(--navy);font-size:clamp(18px,4.6vw,24px);line-height:1.45;
}
html[lang^="zh"] .quote{font-family:var(--cn-serif)}
.quote p{margin:0}
.quote p+p{margin-top:10px}

/* ---------- 卡片网格 ---------- */
.cards{display:grid;grid-template-columns:1fr;gap:14px}
.card{
  position:relative;background:var(--card-bg);border:1px solid var(--line);
  border-radius:var(--radius);padding:22px 20px 20px;overflow:hidden;
}
.card__no{
  position:absolute;top:12px;right:16px;font-family:var(--serif);
  font-size:30px;line-height:1;color:#CFDCEA;
}
.card__bar{width:30px;height:3px;background:var(--blue);border-radius:2px;margin-bottom:14px}
.card h3{font-size:20px;margin:0 0 2px}
.card__label{font-family:var(--serif);font-style:italic;color:var(--blue);font-size:14.5px;margin:0 0 10px}
html[lang^="zh"] .card__label{font-family:var(--cn-serif)}
.card p{margin:0;font-size:15.5px}
.card--plain{background:#fff}

/* 带序号的数字卡（画册 p3 Core Values） */
.values{background:var(--card-bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px}
.values h2{font-size:clamp(20px,5vw,28px);display:flex;flex-wrap:wrap;align-items:baseline;gap:10px}
.values h2 span{font-family:var(--serif);font-style:italic;color:var(--blue);font-size:16px;font-weight:400}
.values__statement{
  border-left:3px solid var(--blue);padding-left:16px;margin:16px 0 22px;
  font-family:var(--serif);color:var(--navy);font-size:clamp(16px,4.2vw,21px);line-height:1.5;
}
html[lang^="zh"] .values__statement{font-family:var(--cn-serif)}
.val{display:grid;grid-template-columns:38px 1fr;gap:12px;padding:12px 0;border-top:1px dashed var(--line)}
.val:first-of-type{border-top:0}
.val__no{
  width:32px;height:32px;border-radius:50%;background:var(--blue);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;
}
.val h3{font-size:17.5px;margin:3px 0 2px}
.val p{margin:0;font-size:15px}

/* ---------- 横幅（照片 + 文案） ---------- */
.banner{position:relative;border-radius:var(--radius);overflow:hidden}
.banner img{width:100%;height:clamp(180px,48vw,300px);object-fit:cover}
.banner__body{
  position:relative;background:var(--navy);color:#fff;padding:22px 20px;
}
.banner__body::before{content:"";position:absolute;left:0;top:0;right:0;height:3px;background:var(--gold);opacity:0}
.banner__kicker{font-family:var(--serif);font-style:italic;color:var(--blue-light);font-size:14.5px;margin:0 0 4px}
.banner__title{font-family:var(--serif);color:#fff;font-size:clamp(19px,4.8vw,28px);margin:0 0 8px}
.banner__text{margin:0;color:#DCE7F2;font-size:15.5px}
html[lang^="zh"] .banner__kicker,html[lang^="zh"] .banner__title{font-family:var(--cn-serif)}

/* ---------- 技术主图 ---------- */
.tech-hero{position:relative;border-radius:var(--radius);overflow:hidden;background:var(--navy-deep)}
.tech-hero img{width:100%;height:auto;display:block;object-fit:contain;background:var(--navy-deep)}
.tech-hero__cap{padding:16px 20px 18px;background:var(--navy-deep);color:#fff}
.tech-hero__cap .kicker{font-family:var(--serif);font-style:italic;color:var(--blue-light);font-size:14px;margin:0 0 2px}
.tech-hero__cap .title{font-family:var(--serif);font-size:clamp(17px,4.4vw,24px);margin:0;color:#fff}
html[lang^="zh"] .tech-hero__cap .title,html[lang^="zh"] .tech-hero__cap .kicker{font-family:var(--cn-serif)}

/* ---------- 特性卡 ---------- */
.feature-grid{display:grid;grid-template-columns:1fr;gap:14px}
.feature{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 18px;box-shadow:var(--shadow);
}
.feature__top{display:flex;align-items:baseline;gap:10px;margin-bottom:6px}
.feature__no{font-family:var(--serif);color:var(--blue);font-size:19px;font-weight:600}
.feature h3{font-size:19px;margin:0}
.feature p{margin:0 0 14px;font-size:15.5px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  background:#EFF3F8;border:1px solid var(--line);border-radius:999px;
  padding:6px 14px;font-size:12.5px;color:#3C4A5A;
}

/* ---------- 联系 ---------- */
.contacts{display:grid;grid-template-columns:1fr;gap:14px}
.contact{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 18px;
}
.contact__no{
  font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--blue);font-weight:700;margin:0 0 2px;
}
.contact h3{font-size:22px;margin:0 0 2px}
.contact__sub{font-family:var(--serif);font-style:italic;color:var(--blue);font-size:14.5px;margin:0 0 12px}
html[lang^="zh"] .contact__sub{font-family:var(--cn-serif)}
.contact__addr,.contact__tel{font-family:var(--roman);color:#3B3A36;font-size:16px;line-height:1.6;margin:0}
.contact__addr{border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:10px}
.contact__tel{font-size:17px}

.online{
  border-top:1px solid var(--line);margin-top:26px;padding-top:20px;
  font-family:var(--roman);font-size:15.5px;color:#3B3A36;text-align:center;
}
.online a{color:var(--navy)}
.online__items{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 10px;align-items:center}
.online__sep{color:#B9B4AC}
.qr{width:112px;margin:16px auto 0;text-align:center}
.qr img{border:1px solid var(--line);border-radius:10px;padding:8px;background:#fff}
.qr figcaption{font-family:var(--sans);font-size:12px;color:var(--muted);margin-top:6px}

/* ---------- 深色收尾横幅 ---------- */
.band{
  background:var(--navy);color:#fff;border-radius:var(--radius);
  padding:24px 20px;display:grid;gap:10px;
}
.band__main{font-family:var(--serif);font-size:clamp(18px,4.6vw,26px);line-height:1.45;margin:0}
.band__main b{color:var(--blue-light);font-weight:600}
html[lang^="zh"] .band__main{font-family:var(--cn-serif)}
.band__aside{font-family:var(--serif);font-style:italic;color:var(--blue-light);font-size:15px;margin:0}
.band--cta{align-items:center;text-align:center}
.band--cta .band__aside{width:100%}
.band__cities{
  font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:#BBD3EA;text-align:left;line-height:2;
}
.band__cities b{color:#fff;letter-spacing:.28em;display:block;font-size:12.5px}
/* 技术页结尾横幅（画册 p4） */
.band--unlock{align-items:center}
.band__unlock{font-family:var(--serif);font-style:italic;font-size:clamp(26px,6.4vw,42px);margin:0;color:#fff}
.band__unlock b{color:var(--blue-light);font-style:italic;font-weight:600}
html[lang^="zh"] .band__unlock{font-family:var(--cn-serif)}
.band__sub{font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:#BBD3EA;margin:8px 0 0}
@media (min-width:900px){
  .band--unlock .band__cities{text-align:right}
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:40px;border-top:1px solid var(--line);background:var(--card-bg);
  padding:26px 0 34px;
}
.site-footer__grid{display:grid;gap:18px}
.site-footer .brand img{height:24px}
.foot-nav{display:flex;flex-wrap:wrap;gap:8px 18px}
.foot-nav a{font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--navy)}
.foot-contact{font-family:var(--roman);font-size:15px;color:#3B3A36}
.foot-contact div{margin-bottom:4px}
.copy{font-size:12.5px;color:var(--muted);margin-top:16px}

/* ---------- 图片上浮动画 ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (min-width:640px){
  .cards,.feature-grid,.contacts{grid-template-columns:repeat(2,1fr)}
  .banner__body{padding:26px 30px}
  .page-head{padding:46px 0 10px}
  .section{padding:56px 0}
  .online{font-size:16px}
}
@media (min-width:900px){
  body{font-size:17px}
  .site-header__inner{height:74px}
  .brand img{height:30px}
  .nav{display:flex;align-items:center;gap:26px;flex:none}
  .burger{display:none}
  .drawer{display:none!important}
  .cards,.feature-grid,.contacts{grid-template-columns:repeat(3,1fr)}
  .hero{padding-top:34px}
  .hero__logo{width:360px}
  .hero__photo{max-width:var(--wrap);margin:0 auto;border-radius:var(--radius);overflow:hidden}
  .hero__photo img{height:clamp(420px,56vw,620px);object-fit:cover;object-position:center 45%}
  .hero__titles{padding-top:34px}
  .banner{display:grid;grid-template-columns:1.05fr .95fr;align-items:stretch}
  .banner img{height:100%;min-height:320px}
  .banner__body{display:flex;flex-direction:column;justify-content:center;padding:34px 40px}
  .tech-hero__cap{padding:20px 40px 22px}
  .band{padding:30px 40px;grid-template-columns:1.4fr .6fr;align-items:center}
  .band--cta{grid-template-columns:1.3fr .7fr;text-align:left}
  .band--cta .band__aside{width:auto;text-align:right}
  .site-footer__grid{grid-template-columns:1.1fr 1fr 1fr;align-items:start}
  .split{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:start}
  .values{padding:32px 34px}
  .val{grid-template-columns:44px 1fr;padding:16px 0}
  .quote{font-size:24px;margin:32px 0}
  .gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
  .gallery img{border-radius:var(--radius);height:100%;object-fit:cover}
}
@media (min-width:1200px){
  .page-head h1{font-size:56px}
  .hero h1{font-size:56px}
}

/* ---------- 打印 ---------- */
@media print{
  .site-header,.drawer,.hero__actions,.btn{display:none}
  body{font-size:11pt}
  .card,.feature,.contact{break-inside:avoid}
}

/* ---------- 补充：图片场景卡 ---------- */
.card--photo{padding:0;overflow:hidden}
.card--photo>img{width:100%;aspect-ratio:3/2;object-fit:cover;display:block;background:#E8EEF4}
.card--photo .card__body{padding:20px 18px}
.card--link{display:block;color:inherit;transition:transform .2s,box-shadow .2s}
.card--link:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(10,58,112,.12)}

/* ---------- 补充：安装服务（步骤） ---------- */
.steps{display:grid;grid-template-columns:1fr;gap:14px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 18px;box-shadow:var(--shadow)}
.step__top{display:flex;align-items:baseline;gap:12px;margin-bottom:8px}
.step__no{font-family:var(--serif);font-size:30px;line-height:1;color:var(--blue);font-weight:700}
.step h3{font-size:19px;margin:0}
.step p{margin:0;font-size:15.5px;color:var(--ink)}
.step .chips{margin-top:12px}

/* ---------- 补充：FAQ ---------- */
.faq-list{display:grid;gap:10px}
.faq{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.faq summary{
  cursor:pointer;padding:16px 18px;font-weight:700;color:var(--navy);
  font-family:var(--serif);font-size:16.5px;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:12px;
}
html[lang^="zh"] .faq summary{font-family:var(--cn-serif)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--sans);font-size:24px;line-height:1;color:var(--blue);font-weight:400;flex:none}
.faq[open] summary::after{content:"–"}
.faq__a{padding:0 18px 18px;margin:0;font-size:15.5px;color:var(--ink)}

/* ---------- 补充：下载中心 ---------- */
.dl-grid{display:grid;grid-template-columns:1fr;gap:14px}
.dl{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:8px}
.dl__meta{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:700}
.dl h3{font-size:20px;margin:0}
.dl p{margin:0;font-size:15.5px;color:var(--ink)}
.dl__qr{width:132px;height:132px;border-radius:12px;border:1px solid var(--line);align-self:flex-start}
.dl .btn{align-self:flex-start;margin-top:6px}

/* ---------- 补充：技术规格表 ---------- */
.spec{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px;box-shadow:var(--shadow)}
.spec h2{font-size:clamp(20px,5vw,28px);margin:0 0 14px}
.spec__table{width:100%;border-collapse:collapse;font-size:15px}
.spec__table th{
  width:34%;text-align:left;font-family:var(--serif);color:var(--navy);
  padding:11px 14px 11px 0;border-bottom:1px solid var(--line);vertical-align:top;font-size:14.5px;
}
html[lang^="zh"] .spec__table th{font-family:var(--cn-serif)}
.spec__table td{padding:11px 0;border-bottom:1px solid var(--line);color:var(--ink);vertical-align:top}
.spec__table tr:last-child th,.spec__table tr:last-child td{border-bottom:0}

/* ---------- 补充：安装位置说明文字 ---------- */
.tech-hero__cap .text{margin:8px 0 0;font-size:14.5px;line-height:1.65;color:#D7E5F2}

/* ---------- 补充：8 项导航在中等桌面收紧 ---------- */
@media (min-width:900px) and (max-width:1160px){
  .nav{gap:14px}
  .nav a{font-size:11.5px;letter-spacing:.09em}
}
@media (min-width:640px){
  .steps{grid-template-columns:1fr 1fr}
  .dl-grid{grid-template-columns:1fr 1fr}
}


/* ---------- 下载中心：客户端软件区 ---------- */
.dl__row{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin:2px 0}
.dl__qrbox{display:flex;flex-direction:column;align-items:center;gap:6px;margin:0}
.dl__qrbox figcaption{font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700}
html[lang^="zh"] .dl__qrbox figcaption{letter-spacing:.06em;text-transform:none;font-size:12px}
.dl__note{font-size:13px;line-height:1.62;color:var(--muted);margin:2px 0 0}
.dl__note a{color:var(--blue);text-decoration:underline}
.dl--feature{border-color:#B9D3E8;background:linear-gradient(180deg,#F6FAFE,#FFFFFF)}
.dl--feature h3{font-size:22px}
@media (min-width:900px){
  .dl--feature{grid-column:span 2}
  .dl--feature .dl__row{justify-content:space-between}
  .dl--feature .dl__note{max-width:76ch}
}
@media (max-width:420px){
  .dl__row{gap:12px}
  .dl__qr{width:104px;height:104px}
}

/* 区块标题下的 tagline 允许换行（.tagline 全局为 nowrap，用于页头短标签） */
.section__head .tagline{white-space:normal;line-height:1.7;letter-spacing:.14em;padding-bottom:0;max-width:48ch;margin:0 auto}
html[lang^="zh"] .section__head .tagline{letter-spacing:.08em;max-width:40ch}
@media (max-width:520px){
  .section__head .tagline{font-size:11px;letter-spacing:.1em}
  html[lang^="zh"] .section__head .tagline{font-size:12px}
}

/* ---------- 头部：中等宽度收紧导航（复标题保持两行显示） ---------- */
@media (min-width:900px) and (max-width:1319px){
  .nav{gap:13px}
  .nav a{font-size:11.5px;letter-spacing:.11em;padding:6px 1px}
  .header__tools{gap:8px}
}

/* ---------- 头部：1320-1599 宽屏微调（副标题 + 8 项导航共存） ---------- */
@media (min-width:1320px) and (max-width:1599px){
  .nav{gap:20px}
  .nav a{font-size:12px;letter-spacing:.12em}
}

/* ---------- 头部：副标题分两行显示（≥1024 空间足够） ---------- */
@media (min-width:1024px){
  .brand__tag{display:block}
}