/* =========================================================
   乐橙官网 · 共享样式表  /assets/site.css
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --paper:#F8F5F0;
  --rule:#E4DFD7;
  --ink:#16283C;
  --midnight:#0C1620;
  --orange:#FF6A1F;
  --peach:#FFB77E;
  --teal:#12B39A;
  --violet:#6C5CE0;
  --grey:#5B6772;
  --mist:#FFF1E5;

  --font-display:"Saira Condensed","Oswald","Source Han Sans HC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --frame-w:1340px;
  --gut:clamp(18px,4.2vw,44px);
  --header-offset:116px;
  --radius:14px;
  --radius-lg:20px;
  --shadow-soft:0 18px 44px -30px rgba(12,22,32,.55);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;}
body{
  margin:0;
  padding-top:var(--header-offset);
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,address{margin:0;font-style:normal;}
ul,ol{margin:0;padding:0;list-style:none;}
img,picture,svg,video{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;padding:0;cursor:pointer;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:4px;}
::selection{background:rgba(255,183,126,.55);color:var(--midnight);}

/* ---------- 3. 排版与中文阅读 ---------- */
.eyebrow{
  display:flex;align-items:center;gap:12px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--grey);
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--orange);flex:0 0 auto;}

.display{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(34px,5.4vw,64px);line-height:1.06;letter-spacing:.005em;
  color:var(--ink);
}
.display--sm{font-size:clamp(26px,3.4vw,40px);line-height:1.16;}

.lede{font-size:clamp(16px,1.6vw,18.5px);line-height:1.8;color:var(--grey);max-width:34em;}

.num{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(30px,4.6vw,56px);line-height:1;letter-spacing:-.02em;
  color:var(--orange);
}
.num--ink{color:var(--ink);}
.num__unit{
  font-family:var(--font-body);font-size:13px;font-weight:600;
  color:var(--grey);letter-spacing:.08em;margin-left:6px;
}

.note{
  font-family:var(--font-mono);font-size:12.5px;line-height:1.75;
  letter-spacing:.02em;color:var(--grey);max-width:34em;
}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  padding:4px 11px;border-radius:999px;
  background:rgba(22,40,60,.07);color:var(--grey);
}
.tag--teal{background:rgba(18,179,154,.14);color:#0A7C6B;}
.tag--violet{background:rgba(108,92,224,.14);color:#4A3DBA;}
.tag--orange{background:rgba(255,106,31,.14);color:#C2410A;}

.rule{height:1px;background:var(--rule);border:0;width:100%;}

.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;
}

/* ---------- 4. 布局骨架 ---------- */
.shell{
  width:100%;max-width:var(--frame-w);
  margin-inline:auto;padding-inline:var(--gut);
}
.section{padding-block:clamp(56px,9vw,132px);}
.section--tight{padding-block:clamp(32px,5vw,72px);}
.stack{display:flex;flex-direction:column;gap:clamp(14px,1.8vw,24px);}

.grid{display:grid;gap:clamp(16px,2.4vw,28px);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.span-3{grid-column:span 3;}
.span-4{grid-column:span 4;}
.span-5{grid-column:span 5;}
.span-7{grid-column:span 7;}
.span-8{grid-column:span 8;}
.span-12{grid-column:span 12;}

/* ---------- 5. 表层 ---------- */
.glass{
  background:rgba(255,255,255,.5);
  border:1px solid rgba(255,255,255,.62);
  border-radius:var(--radius-lg);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);
  backdrop-filter:blur(14px) saturate(1.2);
  box-shadow:var(--shadow-soft);
}
@supports not ((backdrop-filter:blur(4px)) or (-webkit-backdrop-filter:blur(4px))){
  .glass{background:rgba(255,255,255,.9);}
}
.panel{
  background:#FFFFFF;
  border:1px solid var(--rule);
  border-radius:var(--radius-lg);
}

/* ---------- 6. 按钮与行内动作 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:42px;padding:0 20px;
  border:1px solid transparent;border-radius:10px;
  font-family:var(--font-display);font-size:15px;font-weight:700;
  letter-spacing:.06em;line-height:1;white-space:nowrap;
  transition:background-color .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease;
}
.btn--signal{
  background:var(--orange);color:#0C1620;
  box-shadow:0 10px 24px -14px rgba(255,106,31,.95);
}
.btn--signal:hover{background:#FF8038;}
.btn--ghost{
  background:rgba(255,255,255,.55);
  border-color:rgba(22,40,60,.16);
  color:var(--ink);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.btn--ghost:hover{border-color:rgba(22,40,60,.42);background:rgba(255,255,255,.85);}
.btn--quiet{background:transparent;border-color:var(--rule);color:var(--ink);}
.btn--quiet:hover{border-color:var(--orange);color:var(--orange);}
.btn--block{width:100%;}

.link-arrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;
  color:var(--orange);border-bottom:1px solid rgba(255,106,31,.4);
  padding-bottom:2px;transition:border-color .16s ease,color .16s ease;
}
.link-arrow::after{content:"→";font-size:14px;}
.link-arrow:hover{border-color:var(--orange);}

/* ---------- 7. 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--grey);
}
.crumbs a{transition:color .16s ease;}
.crumbs a:hover{color:var(--orange);}
.crumbs__sep{opacity:.5;}

/* ---------- 8. 图片容器基础规则 ---------- */
.figure{
  position:relative;overflow:hidden;
  border:1px solid var(--rule);border-radius:var(--radius-lg);
  background:linear-gradient(150deg,#EFE9E1 0%,#F8F5F0 46%,var(--mist) 100%);
}
.figure__img{width:100%;height:100%;object-fit:cover;display:block;}
.figure--16x9{aspect-ratio:16/9;}
.figure--4x3{aspect-ratio:4/3;}
.figure--1x1{aspect-ratio:1/1;}
.figure--tall{aspect-ratio:3/4;}
.figure--glass{
  background:rgba(255,255,255,.42);
  border-color:rgba(255,255,255,.66);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  box-shadow:var(--shadow-soft);
}
.figure__caption{
  display:block;padding-top:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--grey);
}
@media (max-width:600px){
  .figure--tall{aspect-ratio:4/5;}
}

/* =========================================================
   9. 框架式顶栏
   ========================================================= */
.frame-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
}

.skip-link{
  position:absolute;top:-72px;left:var(--gut);z-index:90;
  padding:10px 18px;
  background:var(--midnight);color:#F8F5F0;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;
  border-radius:0 0 10px 10px;
  transition:top .16s ease;
}
.skip-link:focus{top:0;}

.frame-header__mast{
  background:rgba(248,245,240,.9);
  border-bottom:1px solid var(--rule);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  transition:background-color .24s ease,box-shadow .24s ease;
}
.frame-header__inner{
  display:flex;align-items:center;
  gap:clamp(12px,2vw,28px);
  max-width:var(--frame-w);margin-inline:auto;
  padding:12px var(--gut);
  min-height:68px;
  transition:min-height .24s ease,padding .24s ease;
}
.frame-header[data-scrolled="true"] .frame-header__inner{min-height:56px;padding-block:7px;}
.frame-header[data-scrolled="true"] .frame-header__mast{
  background:rgba(248,245,240,.95);
  box-shadow:0 14px 34px -28px rgba(12,22,32,.75);
}

/* 品牌署名 */
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;}
.brand__mark{
  display:grid;place-items:center;
  width:38px;height:38px;border-radius:11px;
  background:var(--midnight);color:var(--peach);
  font-family:var(--font-mono);font-size:14px;font-weight:700;letter-spacing:.01em;
  box-shadow:0 10px 22px -16px rgba(12,22,32,.95);
}
.brand__text{display:flex;flex-direction:column;line-height:1.18;}
.brand__name{
  font-family:var(--font-display);font-weight:800;
  font-size:19px;letter-spacing:.07em;color:var(--ink);
}
.brand__tag{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;color:var(--grey);
  transition:opacity .2s ease;
}
.frame-header[data-scrolled="true"] .brand__tag{opacity:0;}

/* 服务电话 */
.frame-header__tel{
  margin-left:auto;display:flex;align-items:baseline;gap:9px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;
}
.frame-header__tel-label{color:var(--grey);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;}
.frame-header__tel-num{color:var(--ink);font-weight:700;font-size:14px;}

.frame-header__actions{display:flex;align-items:center;gap:10px;}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  min-height:40px;padding:0 14px;
  border:1px solid rgba(22,40,60,.16);border-radius:10px;
  background:rgba(255,255,255,.55);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--ink);
}
.nav-toggle__bars{
  position:relative;display:block;width:16px;height:2px;
  background:var(--ink);border-radius:2px;
  transition:background-color .2s ease;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;
  background:var(--ink);border-radius:2px;
  transition:transform .2s ease;
}
.nav-toggle__bars::before{top:-5px;}
.nav-toggle__bars::after{top:5px;}
.frame-header[data-open="true"] .nav-toggle__bars{background:transparent;}
.frame-header[data-open="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg);}
.frame-header[data-open="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg);}

/* 栏目索引条 = 页面视觉边框的下沿 */
.frame-nav{
  background:rgba(248,245,240,.72);
  border-bottom:1px solid var(--rule);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.frame-nav__list{
  display:flex;flex-wrap:wrap;
  max-width:var(--frame-w);margin-inline:auto;
  padding:0 var(--gut);
}
.frame-nav__item a{
  position:relative;display:flex;align-items:baseline;gap:9px;
  padding:13px 18px 12px;
  border-right:1px solid var(--rule);
  font-family:var(--font-display);font-size:15px;font-weight:600;letter-spacing:.06em;
  color:var(--ink);
  transition:background-color .16s ease,color .16s ease,box-shadow .16s ease;
}
.frame-nav__item:first-child a{border-left:1px solid var(--rule);}
.frame-nav__item a:hover{background:rgba(255,183,126,.2);}
.frame-nav__item a[aria-current="page"]{
  background:rgba(255,183,126,.3);
  box-shadow:inset 0 -2px 0 var(--orange);
}
.frame-nav__item a[aria-current="page"] .frame-nav__label{font-weight:800;}
.frame-nav__num{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;
  color:var(--grey);transition:color .16s ease;
}
.frame-nav__item a[aria-current="page"] .frame-nav__num{color:var(--orange);}
.frame-nav__label{white-space:nowrap;}

/* 滚动进度 */
.frame-header__progress{
  position:absolute;left:0;bottom:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--peach),var(--orange));
  border-radius:0 2px 2px 0;
  transition:width .12s linear;
  pointer-events:none;
}

/* =========================================================
   10. 页脚
   ========================================================= */
.site-foot{
  background:var(--midnight);
  color:rgba(248,245,240,.72);
  font-size:15px;
  border-top:1px solid rgba(248,245,240,.08);
}
.site-foot__inner{
  display:grid;
  grid-template-columns:minmax(230px,.95fr) 2.6fr;
  gap:clamp(36px,4.6vw,80px);
  max-width:var(--frame-w);margin-inline:auto;
  padding:clamp(52px,7vw,92px) var(--gut) clamp(36px,4.5vw,56px);
}
.site-foot__brand .brand__name{color:#F8F5F0;}
.site-foot__brand .brand__tag{color:rgba(248,245,240,.5);}
.site-foot__lede{
  margin-top:16px;max-width:26em;
  font-size:14.5px;line-height:1.85;color:rgba(248,245,240,.6);
}
.site-foot__cols{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(22px,3vw,44px);
}
.foot-col__title{
  margin-bottom:16px;
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--peach);
}
.foot-col__list li + li{margin-top:10px;}
.foot-col__list a{color:rgba(248,245,240,.76);transition:color .16s ease;}
.foot-col__list a:hover{color:var(--orange);}
.foot-col__address{font-size:14px;line-height:1.95;color:rgba(248,245,240,.72);word-break:break-word;}
.foot-col__line{display:block;}
.foot-col__key{
  display:inline-block;min-width:3.4em;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:rgba(248,245,240,.42);
}
.site-foot .note{margin-top:14px;color:rgba(248,245,240,.5);font-size:12px;}

.site-foot__base{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 28px;
  max-width:var(--frame-w);margin-inline:auto;
  padding:18px var(--gut) 30px;
  border-top:1px solid rgba(248,245,240,.14);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:rgba(248,245,240,.5);
}
.site-foot__copy{flex:1 1 auto;}

/* =========================================================
   11. 滚动显现
   ========================================================= */
.js-on [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s cubic-bezier(.2,.7,.3,1),transform .5s cubic-bezier(.2,.7,.3,1);
}
.js-on [data-reveal].is-in{opacity:1;transform:none;}

/* =========================================================
   12. 响应式
   ========================================================= */
@media (max-width:1180px){
  .frame-header__tel{display:none;}
}

@media (max-width:1080px){
  .site-foot__inner{grid-template-columns:1fr;}
  .site-foot__cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;}
}

@media (max-width:1000px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr));}
  .span-3,.span-4{grid-column:span 3;}
  .span-5{grid-column:span 6;}
  .span-7,.span-8{grid-column:span 6;}
}

@media (max-width:900px){
  :root{--header-offset:76px;}

  .nav-toggle{display:inline-flex;}
  .frame-header__actions{margin-left:auto;}

  .frame-nav{
    position:absolute;left:0;right:0;top:100%;
    max-height:0;overflow:hidden;
    background:rgba(248,245,240,.98);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    border-bottom:0;
    transition:max-height .3s ease;
  }
  .frame-header[data-open="true"] .frame-nav{
    max-height:min(72vh,560px);
    overflow-y:auto;
    box-shadow:0 30px 48px -36px rgba(12,22,32,.85);
  }
  .frame-nav__list{flex-direction:column;padding:6px var(--gut) 20px;}
  .frame-nav__item a{
    border-right:0;border-bottom:1px solid var(--rule);
    padding:15px 2px;font-size:17px;gap:14px;
  }
  .frame-nav__item:first-child a{border-left:0;}
  .frame-nav__item:last-child a{border-bottom:0;}
  .frame-nav__num{font-size:11px;}

  .frame-header[data-scrolled="true"] .frame-header__inner{min-height:60px;}
}

@media (max-width:720px){
  .frame-header__actions .btn--ghost{display:none;}
  .btn{min-height:40px;padding:0 16px;font-size:14px;}
}

@media (max-width:640px){
  body{font-size:16px;}
  .grid--12{grid-template-columns:1fr;}
  .span-3,.span-4,.span-5,.span-7,.span-8,.span-12{grid-column:1 / -1;}
  .site-foot__cols{grid-template-columns:1fr;gap:28px;}
  .site-foot__base{gap:6px 18px;font-size:11.5px;}
  .site-foot__copy{flex:1 1 100%;}
  .brand__mark{width:34px;height:34px;border-radius:9px;font-size:13px;}
  .brand__name{font-size:17px;}
}

/* =========================================================
   13. 降低动效偏好
   ========================================================= */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .js-on [data-reveal]{opacity:1;transform:none;}
  .frame-header__progress{transition:none;}
}