/* ==========================================================
   雅博指南 · 全站共享样式 /assets/site.css
   暖纸 · 赭红 · 梯田青绿 —— 高原田野手册
   ========================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --paper:#F7F1E6;
  --shell:#FFFBF2;
  --ink:#1F2320;
  --ink-soft:#3B3F39;
  --ochre:#A6432B;
  --ochre-deep:#6F2B1D;
  --jade:#2F6B57;
  --jade-mist:#DCE8DF;
  --sand:#D9A441;
  --gray:#6E6A61;
  --line:#D8CDBB;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino GB","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular","Consolas","Menlo",monospace;

  --wrap:1180px;
  --gutter:clamp(18px,4vw,44px);
  --radius:2px;
  --step:clamp(44px,6.5vw,88px);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,dt,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg{max-width:100%;display:block;}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:3px;}
button{font:inherit;color:inherit;background:none;border:0;}
table{border-collapse:collapse;}
::selection{background:var(--sand);color:var(--ink);}
:focus-visible{outline:2px solid var(--jade);outline-offset:3px;border-radius:2px;}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{line-height:1.3;font-weight:700;}
p{max-width:72ch;}
.mono{font-family:var(--font-mono);font-weight:400;letter-spacing:.06em;}

/* ---------- 4. 容器与区块 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:var(--step);}
.section--tint{background:var(--jade-mist);}
.section--shell{background:var(--shell);}
.section--ink{background:var(--ink);color:var(--paper);}
.section--ink .lede,
.section--ink p{color:rgba(247,241,230,.86);}
.section__head{max-width:66ch;}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--ochre);
  margin-bottom:14px;
}
.kicker::before{content:"";width:20px;height:1px;background:var(--ochre);}
.display-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(32px,5.6vw,62px);
  line-height:1.08;
  letter-spacing:.045em;
}
.section-title{
  font-family:var(--font-body);
  font-weight:700;
  font-size:clamp(21px,2.5vw,29px);
  line-height:1.34;
  letter-spacing:.05em;
}
.lede{
  font-size:clamp(16px,1.45vw,19px);
  line-height:1.8;
  color:var(--ink-soft);
  max-width:62ch;
  margin-top:16px;
}
.prose{max-width:68ch;font-size:17px;line-height:1.85;}
.prose p+p{margin-top:1.05em;}
.prose h2,.prose h3{margin-top:1.8em;margin-bottom:.5em;}
.prose ul{list-style:none;margin-top:.7em;display:grid;gap:.45em;}
.prose ul li{padding-left:1.15em;position:relative;}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:7px;height:1px;background:var(--ochre);}

/* ---------- 5. 网格与排列 ---------- */
.grid{display:grid;gap:clamp(18px,3vw,32px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.stack{display:grid;gap:12px;}
.stack--loose{display:grid;gap:clamp(20px,3vw,34px);}
@media (max-width:860px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr);}
}

/* ---------- 6. 面板与标签 ---------- */
.panel{
  background:var(--shell);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.6vw,28px);
}
.panel__title{
  font-family:var(--font-body);
  font-weight:700;
  font-size:18px;
  letter-spacing:.04em;
  margin-bottom:10px;
}
.panel--lift{transition:transform .18s ease,border-color .18s ease;}
.panel--lift:hover{transform:translateY(-3px);border-color:var(--ochre);}
.tag-no{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--ochre);
  border:1px solid var(--line);
  background:var(--shell);
  padding:3px 9px;
  border-radius:var(--radius);
}
.status-dot{
  display:inline-block;
  width:7px;height:7px;
  border-radius:50%;
  background:var(--jade);
  vertical-align:middle;
}
.rule{border:0;border-top:1px solid var(--line);margin:0;}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 20px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.05em;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:var(--radius);
  cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn--solid{background:var(--ochre);color:var(--shell);}
.btn--solid:hover{background:var(--ochre-deep);}
.btn--ghost{border-color:var(--line);color:var(--ink);background:transparent;}
.btn--ghost:hover{border-color:var(--ochre);color:var(--ochre);}
.btn--jade{background:var(--jade);color:var(--shell);}
.btn--jade:hover{background:#255647;}

/* ---------- 8. 面包屑与目录 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--gray);
  padding-block:16px;
}
.breadcrumb__link{color:var(--gray);text-decoration:none;}
.breadcrumb__link:hover{color:var(--ochre);text-decoration:underline;}
.breadcrumb__sep{color:var(--line);}
.toc{position:relative;}
.toc__list{display:grid;gap:2px;}
.toc__link{
  display:block;
  padding:7px 0 7px 13px;
  border-left:2px solid var(--line);
  font-size:13px;
  line-height:1.5;
  color:var(--gray);
  text-decoration:none;
  transition:color .18s ease,border-color .18s ease;
}
.toc__link:hover{color:var(--ink);border-left-color:var(--jade);}
.toc__link[aria-current="true"]{
  color:var(--ochre);
  border-left-color:var(--ochre);
  font-weight:600;
}

/* ---------- 9. 标签页与筛选 ---------- */
.tabs__list{
  display:flex;
  flex-wrap:wrap;
  gap:4px;
  border-bottom:1px solid var(--line);
}
.tabs__btn{
  padding:10px 16px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.05em;
  color:var(--gray);
  border-bottom:2px solid transparent;
  cursor:pointer;
  transition:color .18s ease,border-color .18s ease;
}
.tabs__btn:hover{color:var(--ink);}
.tabs__btn[aria-selected="true"],
.tabs__btn.is-active{color:var(--ochre);border-bottom-color:var(--ochre);}
.tabs__panel{padding-top:22px;}
.tabs__panel[hidden]{display:none;}
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;}
.filter-btn{
  padding:7px 14px;
  font-size:13px;
  letter-spacing:.05em;
  color:var(--ink-soft);
  background:var(--shell);
  border:1px solid var(--line);
  border-radius:var(--radius);
  cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.filter-btn:hover{border-color:var(--jade);color:var(--jade);}
.filter-btn[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--paper);}
.is-hidden{display:none !important;}

/* ---------- 10. 复制按钮 ---------- */
.copy-btn{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:5px 11px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--jade);
  background:transparent;
  border:1px solid var(--line);
  border-radius:var(--radius);
  cursor:pointer;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.copy-btn:hover{border-color:var(--jade);background:var(--jade-mist);}
.copy-btn[data-copied="true"]{color:var(--ochre);border-color:var(--ochre);background:var(--shell);}

/* ---------- 11. 图片容器 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(135deg,var(--jade-mist),#EFE6D6);
}
.media-frame img{width:100%;height:100%;object-fit:cover;}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--landscape{aspect-ratio:16/10;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame__ph{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:12px;
  text-align:center;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:rgba(47,107,87,.62);
  background:
    repeating-linear-gradient(135deg,rgba(47,107,87,.07) 0 2px,transparent 2px 11px),
    var(--jade-mist);
}
.media-frame__caption{
  display:block;
  margin-top:9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--gray);
}

/* ---------- 12. 页头 ---------- */
.site-header{position:relative;z-index:50;background:var(--paper);border-bottom:1px solid var(--line);}
.skip-link{
  position:absolute;
  left:clamp(12px,3vw,28px);
  top:-60px;
  z-index:120;
  padding:10px 18px;
  background:var(--ochre-deep);
  color:var(--paper);
  font-size:13px;
  letter-spacing:.08em;
  text-decoration:none;
  border-radius:var(--radius);
  transition:top .18s ease;
}
.skip-link:focus{top:10px;}

.utility-bar{background:var(--ochre-deep);color:var(--paper);}
.utility-bar__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:38px;
  padding-block:6px;
}
.utility-bar__note{font-size:11px;letter-spacing:.12em;color:rgba(247,241,230,.8);max-width:none;}
.utility-bar__list{display:flex;align-items:center;flex-wrap:wrap;gap:clamp(10px,2vw,26px);}
.utility-link{
  display:inline-block;
  font-size:12px;
  letter-spacing:.07em;
  color:rgba(247,241,230,.9);
  text-decoration:none;
  padding-block:3px;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.utility-link:hover{color:var(--sand);border-bottom-color:var(--sand);}
.utility-link--accent{
  color:var(--paper);
  border:1px solid rgba(217,164,65,.6);
  border-radius:var(--radius);
  padding:3px 11px;
}
.utility-link--accent:hover{background:var(--sand);color:var(--ochre-deep);border-color:var(--sand);}

.scroll-progress{
  position:fixed;
  top:0;left:0;
  width:100%;
  height:3px;
  background:var(--jade);
  transform:scaleX(0);
  transform-origin:0 50%;
  z-index:110;
  pointer-events:none;
}

.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:16px;
  padding-block:clamp(16px,2.4vw,28px);
}
.masthead__meta{font-size:11px;letter-spacing:.16em;color:var(--gray);justify-self:start;max-width:none;}
.masthead__edition{font-size:11px;letter-spacing:.16em;color:var(--gray);justify-self:end;max-width:none;}
.masthead__brand{
  justify-self:center;
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--ink);
}
.masthead__mark{
  display:grid;
  place-items:center;
  width:clamp(34px,4.4vw,44px);
  height:clamp(34px,4.4vw,44px);
  background:var(--ochre);
  color:var(--shell);
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(18px,2.2vw,22px);
  line-height:1;
  border-radius:var(--radius);
}
.masthead__wordmark{display:flex;flex-direction:column;gap:3px;}
.masthead__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(25px,3.7vw,37px);
  letter-spacing:.09em;
  line-height:1.08;
  transition:color .18s ease;
}
.masthead__sub{font-size:10px;letter-spacing:.26em;color:var(--gray);}
.masthead__brand:hover .masthead__name{color:var(--ochre);}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 14px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--ink);
  background:var(--shell);
  border:1px solid var(--line);
  border-radius:var(--radius);
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--jade);}
.nav-toggle__label{line-height:1;}
.nav-toggle__bar{position:relative;display:block;width:16px;height:1.5px;background:var(--ink);transition:background .18s ease;}
.nav-toggle__bar::before,
.nav-toggle__bar::after{
  content:"";
  position:absolute;left:0;
  width:16px;height:1.5px;
  background:var(--ink);
  transition:transform .2s ease,top .2s ease;
}
.nav-toggle__bar::before{top:-5px;}
.nav-toggle__bar::after{top:5px;}
.nav-toggle[data-open]{border-color:var(--ochre);color:var(--ochre);}
.nav-toggle[data-open] .nav-toggle__bar{background:transparent;}
.nav-toggle[data-open] .nav-toggle__bar::before{top:0;transform:rotate(45deg);background:var(--ochre);}
.nav-toggle[data-open] .nav-toggle__bar::after{top:0;transform:rotate(-45deg);background:var(--ochre);}

.site-nav{background:var(--paper);border-top:1px solid var(--line);}
.site-nav__list{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:0 clamp(8px,2.6vw,32px);
}
.site-nav__item{display:flex;}
.site-nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding:14px 2px 12px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--ink);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.site-nav__no{font-size:10px;letter-spacing:.1em;color:var(--gray);font-weight:400;}
.site-nav__link:hover{color:var(--ochre);}
.site-nav__link:hover .site-nav__no{color:var(--ochre);}
.site-nav__link[aria-current="page"]{color:var(--ochre);border-bottom-color:var(--ochre);}
.site-nav__link[aria-current="page"] .site-nav__no{color:var(--ochre);}

@media (max-width:899px){
  .nav-toggle{display:inline-flex;}
  .masthead{grid-template-columns:minmax(0,1fr) auto;padding-block:14px;}
  .masthead__meta,.masthead__edition{display:none;}
  .masthead__brand{justify-self:start;}
  .site-nav{display:none;background:var(--shell);border-top:1px solid var(--line);}
  .site-nav[data-open]{display:block;}
  .site-nav__list{flex-direction:column;gap:0;padding-block:6px 14px;}
  .site-nav__item{display:block;}
  .site-nav__link{
    display:flex;
    width:100%;
    padding:13px 6px;
    font-size:16px;
    border-bottom:1px solid var(--line);
    border-left:3px solid transparent;
  }
  .site-nav__item:last-child .site-nav__link{border-bottom:0;}
  .site-nav__link[aria-current="page"]{
    color:var(--ochre);
    border-bottom-color:var(--line);
    border-left-color:var(--ochre);
    padding-left:12px;
  }
  .utility-bar__inner{justify-content:flex-end;}
  .utility-bar__note{display:none;}
}
@media (max-width:430px){
  .utility-bar__list{gap:10px;}
  .utility-link{font-size:11px;}
  .masthead__sub{letter-spacing:.18em;font-size:9px;}
}

/* ---------- 13. 页脚 ---------- */
.site-footer{background:var(--ochre-deep);color:var(--paper);}
.site-footer__top{
  display:grid;
  grid-template-columns:1.1fr 1.5fr 1fr;
  gap:clamp(24px,4vw,52px);
  padding-block:clamp(36px,5.5vw,64px) clamp(26px,4vw,40px);
  border-bottom:1px solid rgba(247,241,230,.2);
}
.site-footer__brand{border-left:2px solid var(--sand);padding-left:16px;}
.site-footer__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(24px,3.2vw,34px);
  letter-spacing:.1em;
  line-height:1.2;
}
.site-footer__tag{
  margin-top:9px;
  font-size:12px;
  line-height:1.7;
  letter-spacing:.05em;
  color:rgba(247,241,230,.76);
  max-width:26ch;
}
.site-footer__cols{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.footer-col__title{
  font-family:var(--font-mono);
  font-weight:400;
  font-size:11px;
  letter-spacing:.2em;
  color:var(--sand);
  margin-bottom:14px;
}
.footer-col__list{display:grid;gap:9px;}
.footer-col__link{
  font-size:14px;
  letter-spacing:.04em;
  color:rgba(247,241,230,.86);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-col__link:hover{color:var(--sand);border-bottom-color:var(--sand);}
.site-footer__contact{min-width:0;}
.footer-contact{display:grid;gap:2px;}
.footer-contact__row{display:block;}
.footer-contact dt{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--sand);
}
.footer-contact dd{
  margin:2px 0 13px;
  font-size:13px;
  line-height:1.65;
  letter-spacing:.02em;
  color:rgba(247,241,230,.9);
  overflow-wrap:anywhere;
  max-width:26ch;
}
.site-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 26px;
  padding-block:20px 34px;
  font-size:12px;
  letter-spacing:.04em;
  color:rgba(247,241,230,.7);
}
.site-footer__bottom p{max-width:none;}
.site-footer__legal{display:flex;flex-wrap:wrap;gap:18px;}
.site-footer__legal a{color:rgba(247,241,230,.82);text-decoration:none;}
.site-footer__legal a:hover{color:var(--sand);text-decoration:underline;}
.site-footer__note{
  flex:1 0 100%;
  margin-top:6px;
  padding-top:14px;
  border-top:1px solid rgba(247,241,230,.18);
  font-size:11px;
  line-height:1.7;
  letter-spacing:.02em;
  color:rgba(247,241,230,.62);
}

.to-top{
  position:fixed;
  right:clamp(14px,3vw,30px);
  bottom:clamp(14px,3vw,30px);
  z-index:100;
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:10px 15px;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--paper);
  background:var(--ink);
  border:1px solid rgba(217,164,65,.5);
  border-radius:var(--radius);
  cursor:pointer;
  opacity:0;
  pointer-events:none;
  transform:translateY(6px);
  transition:opacity .22s ease,transform .22s ease,background .18s ease;
}
.to-top[data-visible="true"]{opacity:1;pointer-events:auto;transform:translateY(0);}
.to-top:hover{background:var(--ochre);}
.to-top__arrow{font-size:14px;line-height:1;}

@media (max-width:960px){
  .site-footer__top{grid-template-columns:1fr 1fr;}
  .site-footer__contact{grid-column:1 / -1;}
  .footer-contact{grid-template-columns:repeat(3,minmax(0,1fr));gap:0 22px;}
}
@media (max-width:640px){
  .site-footer__top{grid-template-columns:minmax(0,1fr);}
  .site-footer__cols{gap:28px;}
  .footer-contact{grid-template-columns:minmax(0,1fr);}
  .to-top{right:12px;bottom:12px;padding:11px 13px;}
  .to-top__label{
    position:absolute;
    width:1px;height:1px;
    overflow:hidden;
    clip-path:inset(50%);
    white-space:nowrap;
  }
}

/* ---------- 14. 动效降级 ---------- */
@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;
  }
  .panel--lift:hover{transform:none;}
  .to-top{transform:none;}
}

/* ---------- 15. 打印 ---------- */
@media print{
  .site-header,.site-footer,.to-top,.scroll-progress,.skip-link{display:none !important;}
  body{background:#fff;color:#111;font-size:12pt;}
  .section{padding-block:16px;}
  .toc{display:none;}
}