/* ============================================================
   杏运平台 · 共享样式表 /assets/site.css
   语言：旧手册 / 页码索引；墨绿 × 杏黄 × 暖杏白；直角与细线
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote,dl,dd,address{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}

/* ---------- tokens ---------- */
:root{
  --apricot:#F2A93B;
  --apricot-deep:#C9761B;
  --ink-green:#1F3D33;
  --ink:#12211C;
  --paper:#E8DCC8;
  --paper-line:#9A8F7A;
  --cream:#FBF6EC;
  --sheet:#FFFDF7;
  --red:#D8402A;
  --moss:#4A5A50;

  --font-display:"Songti SC","STSong","Source Han Serif SC","Noto Serif SC","SimSun",serif;
  --font-body:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono",SFMono-Regular,Menlo,Consolas,monospace;

  --maxw:1180px;
  --gutter:clamp(18px,4vw,44px);
  --header-h:78px;
  --hair:rgba(31,61,51,.16);
  --hair-strong:rgba(31,61,51,.26);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- base ---------- */
body{
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.85;
  color:var(--ink-green);
  background-color:var(--cream);
  background-image:
    repeating-linear-gradient(to right, rgba(31,61,51,.045) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(to bottom, rgba(31,61,51,.032) 0 1px, transparent 1px 96px);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3{font-family:var(--font-display);font-weight:600;color:var(--ink-green);line-height:1.2;letter-spacing:.01em}
h1{font-size:clamp(38px,7.2vw,84px);line-height:1.04;letter-spacing:0}
h2{font-size:clamp(24px,3.2vw,34px);line-height:1.3}
h3{font-size:clamp(18px,2vw,21px);line-height:1.5}
p{max-width:36em}
.mono{font-family:var(--font-mono);font-size:.86em;letter-spacing:.06em}
#main-content{padding-top:var(--header-h)}
#main-content:focus{outline:none}

:focus-visible{outline:2px solid var(--apricot-deep);outline-offset:3px}
.site-footer :focus-visible{outline-color:var(--apricot)}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:14px;top:-80px;z-index:200;
  background:var(--ink);color:var(--cream);
  padding:10px 18px;font-size:13px;letter-spacing:.08em;
  border-bottom:2px solid var(--apricot);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background:rgba(251,246,236,.78);
  -webkit-backdrop-filter:blur(10px) saturate(125%);
  backdrop-filter:blur(10px) saturate(125%);
  border-bottom:1px solid rgba(31,61,51,.10);
  transition:background .32s var(--ease),border-color .32s var(--ease),box-shadow .32s var(--ease);
}
.site-header[data-scrolled]{
  background:var(--cream);
  border-bottom-color:var(--hair-strong);
  box-shadow:0 14px 26px -26px rgba(18,33,28,.55);
}
.site-header[data-nav-open]{box-shadow:0 18px 34px -28px rgba(18,33,28,.6)}

.header-inner{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  min-height:var(--header-h);
  padding:0 var(--gutter);
  display:grid;
  grid-template-columns:auto 1fr auto auto;
  align-items:center;
  gap:clamp(10px,2vw,30px);
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand__fold{
  flex:none;width:16px;height:24px;background:var(--apricot);
  clip-path:polygon(0 0,100% 0,100% 66%,64% 100%,0 100%);
  transition:background .24s var(--ease);
}
.brand:hover .brand__fold{background:var(--apricot-deep)}
.brand__text{display:grid;gap:1px;line-height:1.15;min-width:0}
.brand__line{
  font-family:var(--font-display);font-size:19px;font-weight:600;
  letter-spacing:.1em;color:var(--ink-green);white-space:nowrap;
}
.brand__sub{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;
  color:var(--moss);white-space:nowrap;
}

/* 导航 */
.site-nav{justify-self:end;min-width:0}
.nav-note{display:none}
.nav-list{display:flex;align-items:center;gap:clamp(8px,1.5vw,24px);flex-wrap:wrap}
.nav-item{min-width:0}
.nav-link{
  position:relative;display:inline-block;padding:6px 1px;
  font-size:14px;letter-spacing:.02em;color:var(--ink-green);
  white-space:nowrap;transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--apricot);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .24s var(--ease);
}
.nav-link:hover{color:var(--apricot-deep)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--ink-green);font-weight:600}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--apricot-deep)}

/* 头部按钮组 */
.header-actions{display:flex;align-items:center;gap:8px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:9px 16px;border:1px solid transparent;border-radius:0;
  font-size:13.5px;font-weight:600;letter-spacing:.04em;line-height:1.2;
  white-space:nowrap;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--solid{background:var(--apricot);color:var(--ink);border-color:var(--apricot)}
.btn--solid:hover{background:var(--apricot-deep);border-color:var(--apricot-deep);color:var(--sheet)}
.btn--ghost{background:transparent;color:var(--ink-green);border-color:rgba(31,61,51,.34)}
.btn--ghost:hover{border-color:var(--ink-green);background:rgba(31,61,51,.07)}
.btn--solid:active,.btn--ghost:active{transform:translateY(1px)}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 11px;border:1px solid rgba(31,61,51,.34);
  font-size:11.5px;letter-spacing:.18em;color:var(--ink-green);
}
.nav-toggle:hover{border-color:var(--ink-green);background:rgba(31,61,51,.06)}
.nav-toggle__bars{display:grid;gap:5px;width:18px}
.nav-toggle__bar{
  display:block;height:1px;width:18px;background:currentColor;
  transition:transform .24s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

/* 头部刻度尺 */
.header-ruler{
  height:6px;
  background-image:repeating-linear-gradient(to right, rgba(31,61,51,.32) 0 1px, transparent 1px 16px);
  background-size:16px 6px;
  background-repeat:repeat-x;
  background-position:bottom left;
  opacity:.45;
  transition:opacity .32s var(--ease);
}
.site-header[data-scrolled] .header-ruler{opacity:0}

/* ---------- 阅读进度 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:120;
  pointer-events:none;background:transparent;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:var(--apricot-deep);opacity:.9;
}

/* ---------- layout ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:820px}
.section{padding-block:clamp(44px,7vw,88px)}
.section--paper{background:var(--paper)}
.section--sheet{background:var(--sheet)}
.section--ink{background:var(--ink);color:rgba(251,246,236,.86)}
.section--ink h2,.section--ink h3{color:var(--cream)}
.section--ink .eyebrow{color:var(--apricot)}
.rule{height:1px;border:0;background:var(--hair);margin-block:clamp(24px,4vw,40px)}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- typographic marks ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:.7em;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;
  color:var(--apricot-deep);
}
.eyebrow::before{content:"";display:block;width:22px;height:1px;background:currentColor}
.prose{max-width:34em}
.prose p{max-width:34em}
.prose p + p{margin-top:1em}
.prose strong{color:var(--ink-green);font-weight:600}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--moss);
}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:var(--paper-line)}
.breadcrumbs a:hover{color:var(--apricot-deep)}

/* ---------- pills ---------- */
.pill{
  display:inline-flex;align-items:center;gap:.45em;
  padding:3px 9px;border:1px solid rgba(31,61,51,.28);border-radius:4px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--ink-green);background:var(--sheet);
}
.pill--alert{border-color:var(--red);color:var(--red);background:rgba(216,64,42,.07)}
.pill--soft{border-color:rgba(201,118,27,.5);color:var(--apricot-deep);background:rgba(242,169,59,.16)}

/* ---------- image plates ---------- */
.plate{
  position:relative;display:block;overflow:hidden;
  background:var(--paper);
  border:1px solid var(--hair);
  width:100%;
}
.plate::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(135deg, rgba(31,61,51,.06) 0 1px, transparent 1px 9px);
  opacity:.9;
}
.plate__img,
.plate img{width:100%;height:100%;object-fit:cover;display:block;position:relative;z-index:1}
.plate--wide{aspect-ratio:16/9}
.plate--4x3{aspect-ratio:4/3}
.plate--square{aspect-ratio:1/1}
.plate--tall{aspect-ratio:3/4}
.plate--fill{aspect-ratio:auto;height:100%}
.plate__caption{
  margin-top:8px;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.06em;color:var(--moss);
}

/* ---------- index links (章节索引) ---------- */
.index-link{
  position:relative;display:block;
  padding:9px 12px 9px 15px;
  border-left:1px solid rgba(31,61,51,.18);
  font-size:13.5px;line-height:1.5;color:var(--moss);
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.index-link:hover{color:var(--ink-green);background:rgba(232,220,200,.55)}
.index-link[aria-current="true"]{
  color:var(--ink-green);font-weight:600;
  background:rgba(242,169,59,.18);
  border-left-color:var(--apricot-deep);
}

/* ---------- pager (继续翻页) ---------- */
.pager{
  margin-top:clamp(36px,5vw,64px);
  padding-top:18px;border-top:1px solid var(--hair);
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(12px,2vw,20px);
}
.pager__link{
  display:block;padding:15px 18px;
  border:1px solid var(--hair);background:var(--sheet);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.pager__link:hover{border-color:var(--apricot-deep);background:var(--cream)}
.pager__kicker{
  display:block;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.18em;color:var(--apricot-deep);
}
.pager__title{
  display:block;margin-top:6px;
  font-family:var(--font-display);font-size:19px;color:var(--ink-green);
}

/* ---------- reveal ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(12px)}
html.js [data-reveal].is-in{
  opacity:1;transform:none;
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--ink);color:var(--cream);
  border-top:2px solid var(--apricot);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(to right, rgba(232,220,200,.055) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(to bottom, rgba(232,220,200,.04) 0 1px, transparent 1px 96px);
}
.footer-inner{
  position:relative;
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--gutter) 26px;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.55fr);
  gap:clamp(28px,5vw,64px);
}
.footer-brand__fold{
  display:block;width:22px;height:22px;margin-bottom:14px;
  background:var(--apricot);
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.footer-brand__name{
  font-family:var(--font-display);font-size:26px;font-weight:600;
  letter-spacing:.14em;color:var(--cream);
}
.footer-brand__intro{
  margin-top:10px;max-width:30em;
  font-size:14.5px;line-height:1.8;color:rgba(232,220,200,.78);
}
.footer-brand__page{
  margin-top:18px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  color:var(--apricot);
}
.footer-grid{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,36px);
}
.footer-col{min-width:0}
.footer-col__title{
  padding-bottom:10px;
  border-bottom:1px solid rgba(232,220,200,.2);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.24em;
  color:var(--apricot);
}
.footer-list{margin-top:14px;display:grid;gap:9px}
.footer-link{
  display:inline-block;font-size:14px;color:rgba(251,246,236,.88);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover{color:var(--apricot);border-bottom-color:var(--apricot)}
.footer-contact{
  margin-top:clamp(28px,4vw,40px);
  padding-top:18px;
  border-top:1px solid rgba(232,220,200,.18);
  display:flex;flex-wrap:wrap;gap:6px 22px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:rgba(232,220,200,.72);
  max-width:none;
}
.footer-contact__item{display:inline-block}
.footer-legal{
  margin-top:16px;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 20px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:rgba(232,220,200,.58);
}
.footer-icp,.footer-copy{max-width:none}

/* ---------- 平板 ---------- */
@media (max-width:1100px){
  .header-actions__query{display:none}
  .nav-list{gap:clamp(8px,1.6vw,16px)}
  .nav-link{font-size:13px}
  .brand__sub{font-size:10px}
}
@media (max-width:980px){
  .footer-top{grid-template-columns:1fr}
}

/* ---------- 移动导航 ---------- */
@media (max-width:900px){
  :root{--header-h:64px}
  .header-inner{grid-template-columns:1fr auto auto;gap:10px}
  .brand__sub{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;
    padding:6px var(--gutter) 18px;
    background:var(--cream);
    border-bottom:1px solid var(--hair-strong);
    border-top:1px solid var(--hair);
    box-shadow:0 22px 34px -28px rgba(18,33,28,.6);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
  }
  .site-nav[data-open]{display:block}
  .nav-note{
    display:block;padding:10px 0 8px;
    font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
    color:var(--apricot-deep);
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{border-bottom:1px solid rgba(154,143,122,.4)}
  .nav-item:last-child{border-bottom:0}
  .nav-link{display:block;padding:14px 2px;font-size:16px;letter-spacing:.02em}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--apricot-deep)}
  .header-actions{gap:6px}
  .header-actions__cta{padding:8px 12px;font-size:12.5px}
}

/* ---------- 网格与通用响应 ---------- */
@media (max-width:760px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .pager{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-legal{flex-direction:column;align-items:flex-start}
}
@media (max-width:520px){
  body{font-size:16px}
  .brand__line{font-size:17px;letter-spacing:.06em}
  .client, .header-actions__cta{padding:7px 10px}
  .header-actions__cta{font-size:12px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:22px}
  .footer-contact{flex-direction:column;gap:6px}
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none;transition:none}
  .scroll-progress__bar{transition:none}
}