/* ============================================================
   乐冠服务 · 共享样式层 /assets/site.css
   藏纸长卷 · 经幡色带 · 硬边档案卡
   ============================================================ */

:root{
  --paper:#F3E9D7;
  --snow:#FFFBF4;
  --ink:#171614;
  --indigo:#16324A;
  --vermilion:#C33A2C;
  --gold:#C7A12B;
  --amber:#DF8A2D;
  --deep-red:#8C2216;
  --slate:#687B85;
  --flag-blue:#2D5F8A;

  --ink-72:rgba(23,22,20,.72);
  --ink-56:rgba(23,22,20,.56);
  --hair:rgba(23,22,20,.16);
  --gold-45:rgba(199,161,43,.45);
  --snow-72:rgba(255,251,244,.72);
  --snow-56:rgba(255,251,244,.56);

  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,"Times New Roman",serif;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --wrap:1180px;
  --gutter:clamp(1.1rem,4vw,3rem);
  --line:3px solid var(--ink);
  --hard:8px 8px 0 rgba(23,22,20,.88);
  --hard-sm:5px 5px 0 rgba(23,22,20,.88);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:5.5rem}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
img,svg{max-width:100%}
h1,h2,h3,h4,h5{font-weight:900}
:focus-visible{outline:3px solid var(--vermilion);outline-offset:3px}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

/* ---------- 基础排版 ---------- */
body{
  background-color:var(--paper);
  background-image:repeating-linear-gradient(0deg,rgba(23,22,20,.022) 0 1px,transparent 1px 5px);
  color:var(--ink);
  font-family:var(--sans);
  font-size:clamp(15px,.35vw + 14px,17px);
  font-weight:400;
  line-height:1.75;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--serif);line-height:1.2;letter-spacing:.01em}
h1{font-size:clamp(2rem,5vw,3.4rem)}
h2{font-size:clamp(1.45rem,2.6vw,2.15rem)}
h3{font-size:clamp(1.1rem,1.6vw,1.35rem)}
p{max-width:68ch}
::selection{background:var(--vermilion);color:var(--snow)}

.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.mono{font-family:var(--mono);letter-spacing:.06em}
.eyebrow{
  display:inline-block;
  font-family:var(--mono);
  font-size:.72rem;font-weight:500;letter-spacing:.26em;
  color:var(--vermilion);text-transform:uppercase;
}
.lede{
  font-size:clamp(1.02rem,1.5vw,1.22rem);
  line-height:1.72;color:var(--ink-72);max-width:60ch;
}
.rule{height:3px;border:0;margin:0;background:var(--ink)}
.rule--gold{height:2px;background:var(--gold)}
.note{
  border-left:4px solid var(--gold);
  padding:.15rem 0 .15rem 1rem;
  color:var(--ink-72);font-size:.9rem;
}

/* ---------- 容器与网格 ---------- */
.container{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(2.6rem,7vw,5.2rem)}
.section--indigo{
  background:var(--indigo);color:var(--snow);
  border-block:3px solid var(--ink);
}
.section--indigo .lede,.section--indigo .note{color:var(--snow-72)}
.section--indigo .eyebrow{color:var(--gold)}
.section-head{display:grid;gap:.7rem;max-width:62ch;margin-bottom:clamp(1.5rem,4vw,2.6rem)}
.stack{display:grid;gap:1rem}
.stack--loose{display:grid;gap:clamp(1.4rem,3vw,2.4rem)}
.grid{display:grid;gap:clamp(1rem,2.5vw,1.7rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.7rem 1.25rem;
  border:2px solid var(--ink);
  background:var(--snow);color:var(--ink);
  font-family:var(--sans);font-size:.9rem;font-weight:700;letter-spacing:.08em;
  box-shadow:4px 4px 0 var(--ink);
  cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease);
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 var(--ink)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--ink)}
.btn--primary{background:var(--vermilion);color:var(--snow);border-color:var(--ink)}
.btn--primary:hover{background:var(--deep-red)}
.btn--gold{background:var(--gold);color:var(--ink)}
.btn--gold:hover{background:var(--amber)}
.btn--ghost{background:transparent;box-shadow:none}
.btn--ghost:hover{background:var(--snow);box-shadow:4px 4px 0 var(--ink)}
.btn--on-dark{background:transparent;color:var(--snow);border-color:var(--gold);box-shadow:4px 4px 0 rgba(199,161,43,.4)}
.btn--on-dark:hover{background:rgba(199,161,43,.18)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.2rem .55rem;
  border:1px solid var(--ink);
  background:var(--snow);color:var(--ink);
  font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;
  line-height:1.6;
}
.tag--gold{background:var(--gold)}
.tag--red{background:var(--vermilion);color:var(--snow);border-color:var(--vermilion)}
.tag--indigo{background:var(--indigo);color:var(--gold);border-color:var(--indigo)}

/* ---------- 卡片 ---------- */
.card{
  background:var(--snow);
  border:var(--line);
  box-shadow:var(--hard);
  padding:clamp(1rem,2.4vw,1.7rem);
}
.card--paper{background:var(--paper)}
.card--indigo{background:var(--indigo);color:var(--snow);box-shadow:8px 8px 0 var(--gold)}
.card__title{font-family:var(--serif);font-weight:900;font-size:1.15rem;margin-bottom:.5rem}
.card__meta{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;color:var(--slate);margin-bottom:.6rem}
.card--indigo .card__meta{color:var(--gold)}
.card__body{font-size:.94rem;color:var(--ink-72)}
.card--indigo .card__body{color:var(--snow-72)}

/* ---------- 图片容器（页面阶段放占位） ---------- */
.img-frame{
  position:relative;display:block;overflow:hidden;
  border:var(--line);background:var(--snow);box-shadow:var(--hard-sm);
}
.img-frame > img{display:block;width:100%;height:100%;object-fit:cover}
.img-frame--16x9{aspect-ratio:16/9}
.img-frame--4x3{aspect-ratio:4/3}
.img-frame--1x1{aspect-ratio:1/1}
.img-frame--3x4{aspect-ratio:3/4}
.img-frame__caption{
  margin-top:.55rem;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;color:var(--slate);
}
.media-band{
  position:relative;overflow:hidden;
  min-height:clamp(180px,26vw,320px);
  background:var(--indigo);
  border-block:var(--line);
  display:flex;align-items:flex-end;
}
.media-band > img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.85}
.media-band__label{
  position:relative;z-index:1;
  padding:clamp(1.1rem,3vw,2rem) var(--gutter);
  color:var(--snow);font-family:var(--mono);
  font-size:.74rem;letter-spacing:.22em;
}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:1rem var(--gutter) 0;
}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  font-family:var(--mono);font-size:.74rem;letter-spacing:.08em;color:var(--slate);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.5rem}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";color:var(--gold);font-weight:700;
}
.breadcrumb__link{
  color:var(--ink-72);
  border-bottom:1px solid var(--gold);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.breadcrumb__link:hover{color:var(--vermilion);border-color:var(--vermilion)}
.breadcrumb__item [aria-current="page"]{color:var(--vermilion);font-weight:700}

/* ---------- 折叠组 ---------- */
.accordion{display:grid;gap:.8rem}
.accordion__item{
  background:var(--snow);border:2px solid var(--ink);
  box-shadow:var(--hard-sm);
}
.accordion__trigger{
  display:flex;width:100%;align-items:center;justify-content:space-between;gap:1rem;
  padding:.9rem 1.05rem;text-align:left;
  font-size:.96rem;font-weight:700;letter-spacing:.02em;
  cursor:pointer;
  transition:background-color .18s var(--ease);
}
.accordion__trigger:hover{background:rgba(199,161,43,.18)}
.accordion__icon{
  position:relative;flex:none;width:1.05rem;height:1.05rem;
  transition:transform .2s var(--ease);
}
.accordion__icon::before,.accordion__icon::after{
  content:"";position:absolute;left:0;right:0;top:50%;height:2px;
  background:var(--vermilion);transform:translateY(-50%);
  transition:transform .2s var(--ease);
}
.accordion__icon::after{transform:translateY(-50%) rotate(90deg)}
.accordion__trigger[aria-expanded="true"] .accordion__icon::after{transform:translateY(-50%) rotate(0)}
.accordion__panel{padding:0 1.05rem 1.05rem;font-size:.92rem;color:var(--ink-72)}
.accordion__panel[hidden]{display:none}

/* ---------- 渐显 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-revealed{opacity:1;transform:none}
html:not(.js) [data-reveal]{opacity:1;transform:none}

/* ============================================================
   页头
   ============================================================ */
.skip-link{
  position:fixed;top:.6rem;left:.6rem;z-index:200;
  transform:translateY(-200%);
  padding:.7rem 1.1rem;
  background:var(--vermilion);color:var(--snow);
  border:3px solid var(--ink);
  font-weight:700;letter-spacing:.08em;
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--paper);
  border-bottom:3px solid var(--ink);
  transition:box-shadow .25s var(--ease);
}
.site-header::before{
  content:"";display:block;height:6px;
  background:linear-gradient(90deg,
    var(--vermilion) 0 20%,
    var(--gold) 20% 40%,
    var(--flag-blue) 40% 60%,
    var(--snow) 60% 80%,
    var(--deep-red) 80% 100%);
}
.site-header[data-condensed="true"]{
  box-shadow:0 6px 0 rgba(23,22,20,.08);
}
.site-header__inner{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:.75rem var(--gutter);
  transition:padding .25s var(--ease);
}
.site-header[data-condensed="true"] .site-header__inner{padding-block:.4rem}

/* 品牌署名 */
.brand{
  position:relative;
  display:flex;align-items:center;gap:.7rem;
  padding-left:.85rem;min-width:0;
  flex:none;
}
.brand::before{
  content:"";position:absolute;left:0;top:50%;
  width:4px;height:2.5rem;
  transform:translateY(-50%);
  background:var(--vermilion);
}
.brand__seal{
  display:grid;place-items:center;flex:none;
  width:2.35rem;height:2.35rem;
  background:var(--indigo);color:var(--gold);
  border:2px solid var(--ink);
  box-shadow:3px 3px 0 var(--vermilion);
  transform:rotate(-2deg);
  font-family:var(--serif);font-weight:900;font-size:1.1rem;line-height:1;
}
.brand__text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand__name{
  font-family:var(--serif);font-weight:900;
  font-size:1.2rem;letter-spacing:.08em;color:var(--ink);
}
.brand__tagline{
  font-size:.66rem;font-weight:500;letter-spacing:.28em;
  color:var(--slate);white-space:nowrap;
  transition:opacity .2s var(--ease);
}
.site-header[data-condensed="true"] .brand__tagline{opacity:0}

/* 菜单按钮 */
.nav-toggle{
  position:relative;z-index:95;
  display:none;align-items:center;gap:.55rem;
  padding:.5rem .8rem;
  border:3px solid var(--ink);background:var(--snow);
  box-shadow:4px 4px 0 var(--ink);
  font-size:.78rem;font-weight:700;letter-spacing:.16em;
  cursor:pointer;
  transition:transform .16s var(--ease),box-shadow .16s var(--ease);
}
.nav-toggle:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--ink)}
.nav-toggle__bars{display:grid;gap:3px;width:18px}
.nav-toggle__bars span{
  display:block;height:2px;background:var(--ink);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* 导航 */
.nav{display:flex;align-items:center;gap:1.2rem;min-width:0}
.nav__eyebrow{display:none}
.nav__list{
  display:flex;align-items:center;gap:.1rem;
  counter-reset:navidx;
}
.nav__item{counter-increment:navidx;position:relative}
.nav__link{
  display:inline-flex;align-items:baseline;gap:.4rem;
  padding:.5rem .55rem;
  font-size:.85rem;font-weight:500;letter-spacing:.04em;
  border-bottom:3px solid transparent;
  white-space:nowrap;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease),font-size .2s var(--ease);
}
.nav__link::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--mono);font-size:.6rem;letter-spacing:.02em;
  color:var(--gold);
}
.nav__link:hover{color:var(--vermilion);border-bottom-color:var(--vermilion)}
.nav__link[aria-current="page"]{
  color:var(--vermilion);
  border-bottom-color:var(--vermilion);
  background:rgba(195,58,44,.08);
}
.nav__cta{
  display:inline-flex;align-items:center;justify-content:center;flex:none;
  padding:.55rem 1rem;
  background:var(--vermilion);color:var(--snow);
  border:2px solid var(--ink);
  box-shadow:4px 4px 0 var(--ink);
  font-size:.84rem;font-weight:700;letter-spacing:.1em;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease);
}
.nav__cta:hover{background:var(--deep-red);transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--ink)}

/* 滚动收拢：索引变成细长标签条 */
.site-header[data-condensed="true"] .nav__link{
  font-size:.74rem;
  padding:.28rem .5rem;
  border-bottom-width:0;
  background:var(--snow);
  box-shadow:inset 0 0 0 1px var(--hair);
}
.site-header[data-condensed="true"] .nav__link[aria-current="page"]{
  background:rgba(195,58,44,.14);
  box-shadow:inset 0 0 0 2px var(--vermilion);
  border-bottom-width:0;
}

/* 阅读进度 */
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-3px;
  height:3px;overflow:hidden;pointer-events:none;
}
.scroll-progress__bar{
  display:block;width:100%;height:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--vermilion) 60%,var(--deep-red));
  transition:transform .1s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,8vw,6rem);
  background:var(--indigo);
  color:var(--snow);
  border-top:6px solid var(--ink);
}
.site-footer::before{
  content:"";display:block;height:4px;
  background-image:repeating-linear-gradient(90deg,var(--gold) 0 28px,transparent 28px 56px);
  opacity:.75;
}
.site-footer__inner{
  display:grid;
  grid-template-columns:1.4fr .9fr .9fr 1.2fr;
  gap:clamp(1.5rem,4vw,3rem);
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:clamp(2.2rem,6vw,3.6rem) var(--gutter);
}
.footer-brand{border-left:3px solid var(--gold);padding-left:1rem}
.footer-brand__name{
  font-family:var(--serif);font-weight:900;
  font-size:1.5rem;letter-spacing:.1em;color:var(--snow);
  max-width:none;
}
.footer-brand__line{
  margin-top:.55rem;font-size:.85rem;letter-spacing:.06em;
  color:var(--snow-72);max-width:32ch;
}
.footer-brand__year{
  margin-top:1.1rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--snow-56);max-width:none;
}
.footer-brand__icp{
  margin-top:.35rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.05em;
  color:var(--snow-56);max-width:none;
}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--sans);font-size:.76rem;font-weight:700;letter-spacing:.24em;
  color:var(--gold);
  padding-bottom:.55rem;margin-bottom:.9rem;
  border-bottom:1px solid var(--gold-45);
}
.footer-list{display:grid;gap:.5rem}
.footer-list a{
  display:inline-block;
  font-size:.9rem;color:var(--snow-72);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-list a:hover{color:var(--gold);padding-left:.35rem}
.footer-contact{display:grid;gap:.6rem;margin-bottom:1.1rem}
.footer-contact__item{display:grid;gap:.1rem;max-width:none}
.footer-contact__label{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.18em;color:var(--gold);
}
.footer-contact__value{
  font-size:.86rem;line-height:1.6;color:var(--snow-72);word-break:break-word;
}
.footer-col__link{
  display:inline-flex;align-items:center;
  padding:.45rem .85rem;
  border:1px solid var(--gold);color:var(--gold);
  font-size:.82rem;font-weight:700;letter-spacing:.1em;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.footer-col__link:hover{background:var(--gold);color:var(--indigo)}
.footer-rail{border-top:1px solid var(--gold-45)}
.footer-rail__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem;
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:1rem var(--gutter) 1.2rem;
}
.footer-rail__link{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.5rem .95rem;
  border:1px solid var(--gold);color:var(--gold);
  font-size:.8rem;font-weight:700;letter-spacing:.12em;
  transition:background-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.footer-rail__link:hover{background:var(--gold);color:var(--indigo);transform:translateY(-1px)}
.footer-rail__meta{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--snow-56);max-width:none;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1099px){
  .site-footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:999px){
  .nav-toggle{display:inline-flex}
  .nav{
    position:fixed;inset:0;z-index:90;
    display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:1rem;
    padding:clamp(4.2rem,13vh,5.6rem) var(--gutter) 2.2rem;
    background:var(--indigo);
    color:var(--snow);
    border-bottom:6px solid var(--gold);
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s linear;
  }
  .nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  body.is-nav-open{overflow:hidden}
  .nav__eyebrow{
    display:block;
    font-family:var(--mono);font-size:.7rem;letter-spacing:.3em;
    color:var(--gold);margin-bottom:.2rem;
  }
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px solid var(--gold-45)}
  .nav__link{
    width:100%;justify-content:flex-start;
    padding:.95rem .2rem;
    font-family:var(--serif);font-size:1.25rem;font-weight:900;
    color:var(--snow);border-bottom:0;
  }
  .nav__link::before{font-size:.76rem;color:var(--gold)}
  .nav__link:hover{color:var(--gold);border-bottom-color:transparent}
  .nav__link[aria-current="page"]{
    color:var(--gold);background:transparent;border-bottom-color:transparent;
  }
  .nav__cta{align-self:flex-start;margin-top:.6rem}
  .site-header[data-condensed="true"] .nav__link{
    font-size:1.25rem;padding:.95rem .2rem;background:transparent;box-shadow:none;
  }
  .site-header[data-condensed="true"] .nav__link[aria-current="page"]{
    background:transparent;box-shadow:none;color:var(--gold);
  }
}
@media (max-width:820px){
  .grid--split,.grid--3{grid-template-columns:minmax(0,1fr)}
  .grid--2{grid-template-columns:minmax(0,1fr)}
  .brand__tagline{display:none}
}
@media (max-width:620px){
  .site-footer__inner{grid-template-columns:minmax(0,1fr)}
  .footer-brand{border-left-width:3px}
  .footer-rail__inner{flex-direction:column;align-items:flex-start}
  .section{padding-block:clamp(2rem,8vw,3rem)}
  h1{font-size:clamp(1.8rem,8vw,2.4rem)}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  [data-reveal]{opacity:1;transform:none}
  .btn:hover,.nav__cta:hover,.footer-rail__link:hover{transform:none}
}