/* ============================================================
   华体品牌站 · 共享样式 /assets/site.css
   高原晨曦 × 编辑部粗野主义 · 暖纸 / 深靛墨 / 暖金 / 藏红
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}

/* ---------- 2. Design tokens ---------- */
:root{
  --paper:#F5EEE1;
  --ink:#131A2C;
  --gold:#E5A03A;
  --saffron:#B4342C;
  --pine:#4C7A61;
  --sky:#3A6B8A;
  --lany:#D8A227;
  --white:#FFFDF8;
  --sand:#E3D7C2;
  --mid:#4A5163;

  --rail:78px;
  --rail-wide:236px;
  --masthead-h:76px;
  --edge:clamp(20px,4vw,72px);
  --gap:24px;
  --bw:3px;

  --hard:5px 5px 0 var(--ink);
  --hard-sm:3px 3px 0 var(--ink);
  --hard-paper:5px 5px 0 var(--sand);

  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- 3. Base & Chinese typography ---------- */
html{scroll-behavior:smooth;}
body{
  margin:0;
  padding-top:var(--masthead-h);
  padding-left:var(--rail);
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{
  font-weight:800;
  line-height:1.24;
  letter-spacing:.05em;
  margin:0 0 .6em;
  text-wrap:balance;
}
h1{font-size:clamp(34px,5vw,66px);letter-spacing:.07em;line-height:1.14;}
h2{font-size:clamp(26px,3.2vw,42px);}
h3{font-size:clamp(20px,2vw,27px);}
h4{font-size:clamp(17px,1.5vw,20px);letter-spacing:.04em;}
p{margin:0 0 1.1em;}
p:last-child{margin-bottom:0;}
strong,b{font-weight:800;}
small{font-size:12.5px;}
hr{border:0;height:var(--bw);background:var(--ink);margin:clamp(28px,4vw,52px) 0;}
::selection{background:var(--gold);color:var(--ink);}
:focus-visible{outline:3px solid var(--sky);outline-offset:3px;border-radius:1px;}

/* ---------- 4. Skip link ---------- */
.skip-link{
  position:fixed;
  top:8px;left:8px;
  z-index:200;
  padding:12px 20px;
  background:var(--gold);
  color:var(--ink);
  font-weight:800;
  font-size:14px;
  letter-spacing:.12em;
  border:var(--bw) solid var(--ink);
  box-shadow:var(--hard);
  transform:translateY(-160%);
  transition:transform 140ms ease;
}
.skip-link:focus{transform:translateY(0);}

/* ---------- 5. Utilities ---------- */
.shell{
  width:100%;
  max-width:1320px;
  margin-inline:auto;
  padding-inline:var(--edge);
}
.grid{display:grid;gap:var(--gap);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.eyebrow{
  display:inline-block;
  font-size:11px;
  font-weight:800;
  letter-spacing:.3em;
  color:var(--saffron);
  text-indent:.3em;
}
.mono{font-family:var(--font-mono);font-weight:600;letter-spacing:.02em;font-variant-numeric:tabular-nums;}
.lead{
  font-size:clamp(17px,1.55vw,20px);
  line-height:1.85;
  color:var(--mid);
  max-width:38em;
}
.note{
  font-size:12.5px;
  line-height:1.7;
  letter-spacing:.06em;
  color:var(--mid);
}
.vert{
  writing-mode:vertical-rl;
  text-orientation:upright;
  letter-spacing:.26em;
  font-size:12px;
  color:var(--mid);
  line-height:1.4;
}

/* ---------- 6. Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:14px 26px;
  font-family:inherit;
  font-size:15px;
  font-weight:800;
  letter-spacing:.1em;
  line-height:1.2;
  background:var(--paper);
  color:var(--ink);
  border:var(--bw) solid var(--ink);
  box-shadow:var(--hard);
  cursor:pointer;
  transition:transform 120ms ease,box-shadow 120ms ease,background 120ms ease,color 120ms ease;
}
.btn:hover{transform:translate(3px,3px);box-shadow:2px 2px 0 var(--ink);}
.btn:active{transform:translate(5px,5px);box-shadow:0 0 0 var(--ink);}
.btn--gold{background:var(--gold);}
.btn--gold:hover{background:var(--lany);}
.btn--ink{background:var(--ink);color:var(--paper);box-shadow:var(--hard-paper);}
.btn--ink:hover{background:var(--saffron);color:var(--white);box-shadow:2px 2px 0 var(--sand);}
.btn--sm{padding:9px 16px;font-size:13px;letter-spacing:.08em;box-shadow:var(--hard-sm);}
.btn--sm:hover{box-shadow:1px 1px 0 var(--ink);}

/* ---------- 7. Tags ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  font-size:11px;
  font-weight:800;
  letter-spacing:.14em;
  line-height:1.5;
  white-space:nowrap;
  background:var(--paper);
  color:var(--ink);
  border:2px solid var(--ink);
}
.tag--gold{background:var(--gold);}
.tag--saffron{background:var(--saffron);color:var(--white);border-color:var(--saffron);}
.tag--pine{background:var(--pine);color:var(--white);border-color:var(--pine);}
.tag--sky{background:var(--sky);color:var(--white);border-color:var(--sky);}

/* ---------- 8. Panels (Bento 基座) ---------- */
.panel{
  position:relative;
  background:var(--white);
  color:var(--ink);
  border:var(--bw) solid var(--ink);
  box-shadow:var(--hard);
  padding:clamp(20px,2.4vw,32px);
  transition:border-color 140ms ease,box-shadow 140ms ease;
}
.panel:hover{border-color:var(--gold);}
.panel--ink{background:var(--ink);color:var(--paper);box-shadow:var(--hard-paper);}
.panel--ink:hover{border-color:var(--gold);}
.panel--gold{background:var(--gold);color:var(--ink);}
.panel--sand{background:var(--sand);}
.panel--paper{background:var(--paper);}
.panel--flat{box-shadow:none;}

/* ---------- 9. Media 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:var(--sand);
  border:var(--bw) solid var(--ink);
}
.media img{width:100%;height:100%;object-fit:cover;display:block;}
.media--16x9{aspect-ratio:16/9;}
.media--4x3{aspect-ratio:4/3;}
.media--1x1{aspect-ratio:1/1;}
.media--3x4{aspect-ratio:3/4;}
.media--21x9{aspect-ratio:21/9;}
.media__cap{
  position:absolute;
  left:0;bottom:0;
  padding:6px 12px;
  background:var(--ink);
  color:var(--paper);
  font-size:11px;
  font-weight:700;
  letter-spacing:.14em;
  line-height:1.6;
}

/* ---------- 10. Breadcrumbs ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 22px;
  padding:0;
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  color:var(--mid);
}
.crumbs li{display:flex;align-items:center;gap:8px;}
.crumbs li+li::before{content:"／";color:var(--gold);font-weight:800;}
.crumbs a{color:var(--mid);border-bottom:2px solid transparent;transition:border-color 140ms ease,color 140ms ease;}
.crumbs a:hover{color:var(--ink);border-bottom-color:var(--gold);}

/* ---------- 11. Header shell ---------- */
.site-header{position:relative;z-index:60;}

/* 11.1 品牌说明带 */
.masthead{
  position:fixed;
  top:0;
  left:var(--rail);
  right:0;
  height:var(--masthead-h);
  background:var(--ink);
  color:var(--paper);
  border-bottom:var(--bw) solid var(--gold);
  z-index:80;
}
.masthead__grid{
  display:flex;
  align-items:center;
  gap:clamp(14px,3vw,40px);
  height:100%;
  padding:0 clamp(14px,2.4vw,36px);
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
  color:var(--paper);
  transition:color 140ms ease;
}
.brand:hover{color:var(--gold);}
.brand__seal{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:38px;
  height:38px;
  background:var(--gold);
  color:var(--ink);
  font-size:18px;
  font-weight:800;
  letter-spacing:0;
  border:2px solid var(--paper);
}
.brand__body{display:flex;flex-direction:column;line-height:1.3;min-width:0;}
.brand__name{font-size:15px;font-weight:800;letter-spacing:.09em;white-space:nowrap;}
.brand__tag{font-size:10.5px;font-weight:600;letter-spacing:.18em;color:var(--sand);white-space:nowrap;}

.masthead__meta{
  display:flex;
  align-items:center;
  gap:clamp(12px,2.4vw,34px);
  margin-left:auto;
}
.masthead__item{
  display:flex;
  flex-direction:column;
  line-height:1.35;
  color:var(--paper);
  padding-bottom:3px;
  border-bottom:2px solid transparent;
  transition:border-color 140ms ease,color 140ms ease;
}
.masthead__item:hover{border-bottom-color:var(--gold);color:var(--gold);}
.masthead__k{font-size:10px;font-weight:700;letter-spacing:.22em;color:var(--gold);}
.masthead__v{font-family:var(--font-mono);font-size:12.5px;font-weight:600;letter-spacing:.01em;}

/* 11.2 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:8px 13px;
  background:var(--paper);
  color:var(--ink);
  border:2px solid var(--gold);
  font-family:inherit;
  font-size:12px;
  font-weight:800;
  letter-spacing:.16em;
  line-height:1;
  cursor:pointer;
  transition:background 140ms ease,color 140ms ease;
}
.nav-toggle:hover{background:var(--gold);}
.nav-toggle__icon{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  background:var(--ink);
  transition:background 140ms ease;
}
.nav-toggle__icon::before,
.nav-toggle__icon::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:var(--ink);
  transition:transform 140ms ease;
}
.nav-toggle__icon::before{top:-5px;}
.nav-toggle__icon::after{top:5px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon{background:transparent;}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before{transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after{transform:translateY(-5px) rotate(-45deg);}
.nav-toggle__text{display:block;}

/* 11.3 阅读进度 */
.scroll-meter{
  position:absolute;
  left:0;right:0;bottom:0;
  height:3px;
  overflow:hidden;
  pointer-events:none;
}
.scroll-meter__bar{
  display:block;
  height:100%;
  background:var(--saffron);
  transform:scaleX(0);
  transform-origin:0 50%;
}

/* 11.4 侧向浮动索引 */
.side-nav{
  position:fixed;
  top:var(--masthead-h);
  left:0;
  bottom:0;
  width:var(--rail);
  display:flex;
  flex-direction:column;
  background:var(--paper);
  border-right:var(--bw) solid var(--ink);
  overflow-y:auto;
  overflow-x:hidden;
  z-index:70;
  scrollbar-width:thin;
  transition:width 160ms ease;
}
.side-nav:is(:hover,:focus-within,[data-open="true"]){width:var(--rail-wide);}
.side-nav__list{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding:10px 0;
  flex:1 0 auto;
}
.side-nav__link{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  padding:12px 3px;
  color:var(--ink);
  font-size:14px;
  font-weight:700;
  line-height:1.2;
  transition:background 140ms ease,color 140ms ease;
}
.side-nav__link:hover{background:var(--sand);}
.side-nav__link[aria-current="page"]{
  background:var(--gold);
  color:var(--ink);
  box-shadow:inset 5px 0 0 var(--saffron);
}
.side-nav__num{
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--mid);
  font-variant-numeric:tabular-nums;
}
.side-nav__link[aria-current="page"] .side-nav__num{color:var(--ink);}
.side-nav__label{
  writing-mode:vertical-rl;
  text-orientation:upright;
  letter-spacing:.16em;
  line-height:1.15;
  white-space:nowrap;
}
.side-nav:is(:hover,:focus-within,[data-open="true"]) .side-nav__link{
  flex-direction:row;
  align-items:center;
  justify-content:flex-start;
  gap:14px;
  padding:12px 18px;
}
.side-nav:is(:hover,:focus-within,[data-open="true"]) .side-nav__label{
  writing-mode:horizontal-tb;
  letter-spacing:.1em;
}

/* ---------- 12. Footer ---------- */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--paper);
  padding:clamp(40px,5vw,68px) var(--edge) clamp(20px,3vw,28px);
  margin-top:clamp(40px,6vw,88px);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:5px;
  background:linear-gradient(90deg,
    var(--gold) 0 25%,
    var(--saffron) 25% 50%,
    var(--pine) 50% 75%,
    var(--sky) 75% 100%);
}
.site-footer__grid{
  display:grid;
  grid-template-columns:minmax(200px,1.05fr) minmax(0,1.6fr) minmax(230px,1.2fr);
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(28px,4vw,48px);
  border-bottom:1px solid rgba(245,238,225,.22);
}
.foot-brand__name{
  display:inline-block;
  margin-bottom:14px;
  font-size:19px;
  font-weight:800;
  letter-spacing:.09em;
  color:var(--paper);
  border-bottom:3px solid transparent;
  transition:border-color 140ms ease,color 140ms ease;
}
.foot-brand__name:hover{border-bottom-color:var(--gold);color:var(--gold);}
.foot-brand__line{
  max-width:24em;
  margin:0 0 18px;
  font-size:14px;
  line-height:1.8;
  color:var(--sand);
}
.foot-brand__icp{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.04em;
  color:var(--gold);
}
.foot-nav{
  display:flex;
  flex-wrap:wrap;
  gap:clamp(16px,3vw,48px);
  align-content:start;
}
.foot-nav__col{
  display:flex;
  flex-direction:column;
  gap:9px;
  min-width:88px;
  font-size:14px;
  line-height:1.6;
}
.foot-nav__col a{
  position:relative;
  display:inline-block;
  padding-bottom:2px;
  color:var(--sand);
  transition:color 140ms ease;
}
.foot-nav__col a::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  height:2px;width:0;
  background:var(--gold);
  transition:width 160ms ease;
}
.foot-nav__col a:hover{color:var(--paper);}
.foot-nav__col a:hover::after{width:100%;}
.foot-contact{
  display:flex;
  flex-direction:column;
  gap:14px;
  font-size:14px;
}
.foot-contact__item{
  display:flex;
  flex-direction:column;
  line-height:1.4;
  color:var(--paper);
  border-bottom:2px solid transparent;
  padding-bottom:3px;
  transition:border-color 140ms ease,color 140ms ease;
  align-self:flex-start;
}
.foot-contact__item:hover{border-bottom-color:var(--gold);color:var(--gold);}
.foot-contact__k{font-size:10px;font-weight:700;letter-spacing:.22em;color:var(--gold);margin-bottom:3px;}
.foot-contact__v{font-family:var(--font-mono);font-size:13px;font-weight:600;letter-spacing:.01em;}
.foot-contact__addr{
  margin:0;
  font-size:13px;
  line-height:1.7;
  color:var(--sand);
}
.foot-contact__note{
  margin:0;
  font-size:12px;
  line-height:1.75;
  letter-spacing:.04em;
  color:rgba(245,238,225,.62);
  padding-left:12px;
  border-left:3px solid var(--saffron);
}
.site-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-top:clamp(18px,2.4vw,26px);
  font-size:12px;
  letter-spacing:.1em;
  color:rgba(245,238,225,.66);
}
.foot-copy{margin:0;}
.foot-domain{
  margin:0;
  font-family:var(--font-mono);
  font-weight:600;
  letter-spacing:.06em;
  color:var(--gold);
}

/* ---------- 13. Reveal 协议 ---------- */
[data-reveal]{opacity:1;transition:opacity 180ms ease;}
.js [data-reveal]{opacity:0;}
.js [data-reveal].is-in{opacity:1;}

/* ---------- 14. Responsive ---------- */
@media (max-width:1200px){
  .masthead__meta .masthead__item:first-child{display:none;}
}

@media (max-width:960px){
  :root{--masthead-h:64px;--edge:clamp(18px,5vw,40px);--gap:18px;}

  body{padding-left:0;padding-top:var(--masthead-h);}

  .masthead{left:0;}
  .masthead__grid{gap:12px;padding:0 16px;}
  .masthead__meta{display:none;}
  .nav-toggle{display:inline-flex;}
  .brand__seal{width:32px;height:32px;font-size:15px;border-width:2px;}
  .brand__name{font-size:13.5px;letter-spacing:.05em;}
  .brand__tag{display:none;}

  .side-nav,
  .side-nav:is(:hover,:focus-within,[data-open="true"]){
    top:auto;
    left:0;
    right:0;
    bottom:0;
    width:100%;
    max-height:76vh;
    border-right:0;
    border-top:var(--bw) solid var(--ink);
    padding:16px 16px calc(16px + env(safe-area-inset-bottom));
    transform:translateY(102%);
    transition:transform 180ms ease;
    overflow-y:auto;
    box-shadow:0 -6px 0 rgba(19,26,44,.12);
  }
  .side-nav[data-open="true"]{transform:translateY(0);}

  .side-nav__list{flex-direction:row;flex-wrap:wrap;gap:10px;padding:0;}
  .side-nav__list > li{flex:1 1 calc(50% - 5px);}
  .side-nav__link,
  .side-nav:is(:hover,:focus-within,[data-open="true"]) .side-nav__link{
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:10px;
    padding:12px 14px;
    background:var(--white);
    border:2px solid var(--ink);
    box-shadow:var(--hard-sm);
  }
  .side-nav__label,
  .side-nav:is(:hover,:focus-within,[data-open="true"]) .side-nav__label{
    writing-mode:horizontal-tb;
    letter-spacing:.08em;
  }
  .side-nav__link[aria-current="page"]{background:var(--gold);box-shadow:var(--hard-sm);}
  .side-nav__link:hover{background:var(--sand);}

  .site-footer{padding-inline:var(--edge);}
  .site-footer__grid{grid-template-columns:1fr;gap:clamp(24px,4vw,36px);}
  .foot-contact__note{max-width:34em;}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr));}
}

@media (max-width:640px){
  body{font-size:16px;}
  h1{letter-spacing:.05em;}
  .site-footer__base{flex-direction:column;align-items:flex-start;gap:6px;}
  .foot-nav{gap:20px 36px;}
  .grid--12{grid-template-columns:repeat(2,minmax(0,1fr));}
  .side-nav__list > li{flex:1 1 100%;}
  .btn{width:100%;}
}

/* ---------- 15. Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .js [data-reveal]{opacity:1 !important;}
  .btn:hover,.btn:active{transform:none;}
  .skip-link{transition:none;}
}