/* ============================================================
   365在线 · 全站共享样式 /assets/site.css
   草原公路编辑体系：云白纸底、墨绿黑粗线、青绿索引、琥珀操作
   ============================================================ */

:root{
  --ink:#0E1B18;
  --paper:#FBF7EE;
  --sand:#EFE4CF;
  --sand-line:#D8C6A6;
  --grass:#0F7A5A;
  --grass-mist:#D8EDE3;
  --sky:#2F7FA8;
  --sky-mist:#DDEBF3;
  --amber:#E08A1E;
  --amber-mist:#FBE6C2;
  --moss:#6E7F78;

  --footer-fg:#FBF7EE;
  --footer-muted:#A9B7B0;
  --footer-accent:#7ACFB0;

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

  --shell:1320px;
  --gutter:clamp(16px,4vw,48px);
  --header-h:64px;
  --line:2px solid var(--ink);
  --shadow-hard:6px 6px 0 var(--ink);
}

*,*::before,*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-padding-top:calc(var(--header-h) + 20px);
}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth;}
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
}

img,svg{max-width:100%;}
h1,h2,h3,h4{margin:0;font-weight:300;line-height:1.22;letter-spacing:-.01em;}
h1{font-size:clamp(2.4rem,6vw,5.6rem);}
h2{font-size:clamp(1.6rem,3vw,2.6rem);}
h3{font-size:clamp(1.15rem,1.8vw,1.5rem);font-weight:400;line-height:1.4;}
p{margin:0;}
a{color:var(--grass);}
strong{font-weight:600;}
ul,ol{margin:0;padding:0;}

:focus-visible{outline:3px solid var(--grass);outline-offset:3px;}
.site-footer :focus-visible{outline-color:var(--amber);}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:-140px;left:12px;z-index:999;
  padding:10px 20px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  text-decoration:none;
  border-radius:2px;
  transition:top .16s ease;
}
.skip-link:focus{top:12px;}

/* ---------- 容器与节奏 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(48px,7vw,96px);}
.section--sand{background:var(--sand);border-block:1px solid var(--sand-line);}
.section--mist{background:var(--grass-mist);}
.stack > * + *{margin-top:1.1em;}

/* ============================================================
   页头：紧凑命令栏
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--paper);
  border-bottom:var(--line);
}
.header-shell{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,26px);
  min-height:var(--header-h);
}

/* 品牌印记 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--ink);
}
.brand__mark{
  display:grid;
  place-items:center;
  width:40px;height:40px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  border-radius:2px;
  box-shadow:3px 3px 0 var(--amber);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2;}
.brand__name{font-size:17px;font-weight:700;letter-spacing:.02em;}
.brand__tagline{font-size:11.5px;letter-spacing:.06em;color:var(--moss);}

/* 状态提示 */
.header-status{
  display:none;
  margin:0;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--moss);
  white-space:nowrap;
}
.status-dot{
  width:8px;height:8px;
  border-radius:50%;
  background:var(--grass);
  box-shadow:0 0 0 3px var(--grass-mist);
  flex:0 0 auto;
}
@media (prefers-reduced-motion:no-preference){
  .status-dot{animation:statusPulse 2.6s ease-in-out infinite;}
}
@keyframes statusPulse{
  0%,100%{box-shadow:0 0 0 3px var(--grass-mist);}
  50%{box-shadow:0 0 0 6px rgba(216,237,227,.45);}
}
@media (min-width:1180px){
  .header-status{display:flex;}
}

/* 导航：移动端为下拉命令面板 */
.nav{
  position:absolute;
  left:0;right:0;top:100%;
  background:var(--paper);
  border-bottom:var(--line);
  box-shadow:0 12px 0 rgba(14,27,24,.08);
  padding:6px var(--gutter) 22px;
  max-height:calc(100vh - var(--header-h));
  overflow:auto;
  visibility:hidden;
  opacity:0;
  transform:translateY(-8px);
  transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
}
.nav[data-open="true"]{
  visibility:visible;
  opacity:1;
  transform:translateY(0);
}
.nav__list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:0;
}
.nav__item{border-bottom:1px solid var(--sand-line);}
.nav__item:last-child{border-bottom:0;}
.nav__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:9px;
  padding:15px 0;
  color:var(--ink);
  font-size:16px;
  font-weight:500;
  letter-spacing:.01em;
  text-decoration:none;
  transition:color .16s ease,padding-left .16s ease,box-shadow .16s ease;
}
.nav__link::after{content:none;}
.nav__index{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--moss);
  transition:color .16s ease;
}
.nav__link[aria-current="page"]{
  color:var(--grass);
  padding-left:12px;
  box-shadow:inset 3px 0 0 var(--grass);
}
.nav__link[aria-current="page"] .nav__index{color:var(--grass);}

/* 页头动作区 */
.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
}
.header-actions .btn{padding:.72em 1.05em;font-size:14px;}

/* 菜单按钮 */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:10px 13px;
  background:var(--paper);
  color:var(--ink);
  border:2px solid var(--ink);
  border-radius:2px;
  font-family:var(--font-sans);
  font-size:13px;
  font-weight:500;
  line-height:1;
  cursor:pointer;
  transition:background-color .16s ease,color .16s ease;
}
.nav-toggle:hover{background:var(--sand);}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;height:2px;
  background:var(--ink);
  transition:background-color .18s ease;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;height:2px;
  background:var(--ink);
  transition:transform .18s ease;
}
.nav-toggle__bars::before{top:-5px;}
.nav-toggle__bars::after{top:5px;}
.nav-toggle[aria-expanded="true"]{background:var(--ink);color:var(--paper);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{background:var(--paper);transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{background:var(--paper);transform:translateY(-5px) rotate(-45deg);}

/* 阅读进度 */
.header-progress{
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:2px;
  pointer-events:none;
  background:linear-gradient(
    to right,
    var(--amber) 0 calc(var(--progress,0) * 100%),
    transparent calc(var(--progress,0) * 100%)
  );
}

/* 桌面导航 */
@media (min-width:981px){
  .nav{
    position:static;
    visibility:visible;
    opacity:1;
    transform:none;
    margin-left:auto;
    padding:0;
    border:0;
    box-shadow:none;
    background:transparent;
    max-height:none;
    overflow:visible;
  }
  .nav__list{flex-direction:row;align-items:center;gap:clamp(8px,1.5vw,24px);}
  .nav__item{border-bottom:0;}
  .nav__link{
    padding:8px 2px;
    font-size:14.5px;
    white-space:nowrap;
  }
  .nav__link::after{
    content:"";
    position:absolute;
    left:0;right:0;bottom:0;
    height:2px;
    background:var(--grass);
    transform:scaleX(0);
    transform-origin:0 50%;
    transition:transform .16s ease;
  }
  .nav__link:hover{color:var(--grass);}
  .nav__link:hover::after{transform:scaleX(1);}
  .nav__link:hover .nav__index{color:var(--grass);}
  .nav__link[aria-current="page"]{
    color:var(--grass);
    padding-left:2px;
    box-shadow:none;
  }
  .nav__link[aria-current="page"]::after{transform:scaleX(1);}
  .header-actions{margin-left:0;}
  .nav-toggle{display:none;}
}
@media (max-width:520px){
  .header-actions .btn{display:none;}
  .brand__tagline{display:none;}
}

/* ============================================================
   通用按钮
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  padding:.82em 1.35em;
  border:2px solid var(--ink);
  border-radius:2px;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:15px;
  font-weight:500;
  line-height:1;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease,color .16s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:4px 4px 0 var(--ink);}
.btn:active{transform:translate(0,0);box-shadow:none;}
.btn--accent{background:var(--amber);color:var(--ink);}
.btn--ghost{background:transparent;}
.btn--grass{background:var(--grass);color:var(--paper);border-color:var(--grass);}
.btn--grass:hover{box-shadow:4px 4px 0 var(--ink);}

/* ============================================================
   标签、索引文字、面包屑
   ============================================================ */
.label-mono{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--moss);
  line-height:1.6;
}
.tag{
  display:inline-block;
  padding:.45em .75em;
  border-radius:999px;
  background:var(--grass-mist);
  color:var(--grass);
  font-size:12.5px;
  font-weight:500;
  line-height:1.1;
  letter-spacing:.03em;
}
.tag--sand{background:var(--sand);color:var(--ink);}
.tag--sky{background:var(--sky-mist);color:var(--sky);}

.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.55em;}
.breadcrumb li{display:flex;align-items:center;color:var(--moss);}
.breadcrumb li + li::before{content:"/";margin-right:.55em;color:var(--sand-line);}
.breadcrumb a{color:var(--moss);text-decoration:none;transition:color .16s ease;}
.breadcrumb a:hover{color:var(--grass);}
.breadcrumb [aria-current="page"]{color:var(--ink);}

/* ============================================================
   筛选按钮组
   ============================================================ */
.chip-group{display:flex;flex-wrap:wrap;gap:8px;}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:9px 15px;
  border:1.5px solid var(--sand-line);
  border-radius:999px;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:13px;
  font-weight:500;
  line-height:1;
  cursor:pointer;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.chip:hover{border-color:var(--ink);}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink);}

/* ============================================================
   内页对照版式：左标签右正文
   ============================================================ */
.rail-layout{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(20px,3vw,40px);
  align-items:start;
}
.rail-layout__rail{position:static;}
@media (min-width:861px){
  .rail-layout{grid-template-columns:200px minmax(0,1fr);gap:clamp(28px,4.5vw,64px);}
  .rail-layout__rail{position:sticky;top:calc(var(--header-h) + 24px);}
}

/* 页内锚点目录 */
.toc-link{
  display:block;
  padding:9px 0 9px 13px;
  border-left:2px solid var(--sand-line);
  color:var(--moss);
  font-size:14px;
  line-height:1.55;
  text-decoration:none;
  transition:color .16s ease,border-color .16s ease,background-color .16s ease;
}
.toc-link:hover{color:var(--ink);border-color:var(--ink);}
.toc-link[aria-current]{
  color:var(--grass);
  border-color:var(--grass);
  background:var(--grass-mist);
  font-weight:500;
}

/* ============================================================
   编辑部目录行
   ============================================================ */
.index-list{list-style:none;border-top:var(--line);}
.index-row{
  display:grid;
  grid-template-columns:1fr;
  gap:6px 22px;
  padding:18px 0;
  border-bottom:1px solid var(--sand-line);
}
@media (min-width:720px){
  .index-row{grid-template-columns:96px minmax(0,1fr) auto;align-items:baseline;}
}
.index-row__no{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--grass);
  white-space:nowrap;
}

/* ============================================================
   导读块
   ============================================================ */
.note{
  margin:0;
  padding:15px 20px;
  border-left:4px solid var(--grass);
  background:var(--grass-mist);
  font-size:15px;
  line-height:1.85;
}
.note--sand{border-left-color:var(--amber);background:var(--amber-mist);}

/* ============================================================
   图片容器基础规则（页面阶段放入 <img>）
   ============================================================ */
.figure{margin:0;display:grid;gap:.8rem;}
.figure__media{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:2px solid var(--ink);
  border-radius:2px;
  background:var(--sky-mist);
}
.figure__media img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure__caption{
  font-size:13px;
  line-height:1.7;
  color:var(--moss);
}
.figure--wide .figure__media{aspect-ratio:21 / 9;}
.figure--square .figure__media{aspect-ratio:1 / 1;}

/* ============================================================
   滚动显现
   ============================================================ */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .45s ease,transform .45s ease;
}
.js-reveal [data-reveal].is-visible{opacity:1;transform:none;}

/* ============================================================
   页脚：深色底板
   ============================================================ */
.site-footer{
  background:var(--ink);
  color:var(--footer-fg);
  border-top:6px solid var(--grass);
  padding-block:clamp(40px,6vw,76px) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(28px,4vw,52px);
  padding-bottom:clamp(32px,4.5vw,60px);
}
.footer-brand__line{
  margin:0 0 14px;
  font-size:clamp(1.5rem,2.6vw,2.05rem);
  font-weight:200;
  line-height:1.28;
  letter-spacing:.01em;
  color:var(--footer-fg);
}
.footer-brand__note{
  margin:0 0 22px;
  max-width:34ch;
  font-size:14px;
  line-height:1.85;
  color:var(--footer-muted);
}
.footer-cta{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:11px 17px;
  border:2px solid var(--footer-fg);
  border-radius:2px;
  color:var(--footer-fg);
  font-size:14px;
  font-weight:500;
  line-height:1;
  text-decoration:none;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.footer-cta:hover{
  background:var(--amber);
  border-color:var(--amber);
  color:var(--ink);
}
.footer-col__title{
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--footer-accent);
}
.footer-list{list-style:none;display:grid;gap:11px;}
.footer-link{
  color:var(--footer-fg);
  font-size:14.5px;
  line-height:1.6;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.footer-link:hover{color:var(--footer-accent);border-bottom-color:var(--footer-accent);}

.footer-facts{margin:0;display:grid;gap:13px;}
.footer-fact{display:grid;gap:2px;}
.footer-fact dt{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--footer-muted);
}
.footer-fact dd{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--footer-fg);
  overflow-wrap:anywhere;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 26px;
  padding-block:20px;
  border-top:1px solid rgba(251,247,238,.22);
}
.footer-copy,
.footer-icp,
.footer-note{
  margin:0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--footer-muted);
}

@media (min-width:720px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-col--contact{grid-column:1 / -1;}
  .footer-facts{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 28px;}
}
@media (min-width:1060px){
  .footer-grid{grid-template-columns:1.5fr .8fr .8fr 1.2fr;}
  .footer-col--contact{grid-column:auto;}
  .footer-facts{grid-template-columns:1fr;}
}

/* ============================================================
   减少动效
   ============================================================ */
@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-reveal [data-reveal]{opacity:1;transform:none;}
  .btn:hover,.chip:hover{transform:none;}
}