/* ============================================================
   亿万28苹果 · 数字果园手册
   共享样式 /assets/site.css
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --green:#7ED321;
  --green-soft:#93E043;
  --deep:#1F3D2B;
  --forest:#10241A;
  --moss:#6B7F5A;
  --moss-soft:#A9BE97;
  --stone:#6E7377;
  --clay:#B36A4A;
  --amber:#FF8A3D;
  --cream:#F4F1E8;
  --paper:#FBFAF5;
  --line:#D9D5C9;
  --ink:#14181A;

  --shell:1280px;
  --gutter:clamp(18px,4vw,40px);
  --gap:24px;
  --header-h:66px;
  --ease:cubic-bezier(0.2,0.7,0.2,1);

  --font-display:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,serif;
  --font-index:Inter,"Source Han Sans SC","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC",system-ui,-apple-system,"Helvetica Neue",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- 2. Reset 与中文排版 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 20px);
}
body{
  margin:0;
  background:var(--cream);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;}
img{height:auto;}
ul,ol{margin:0;padding:0;list-style:none;}
a{color:inherit;}
button{font:inherit;}
p{margin:0 0 0.9em;}
p:last-child{margin-bottom:0;}
h1,h2,h3,h4{margin:0;font-weight:800;line-height:1.25;}
strong{font-weight:700;}
[hidden]{display:none !important;}
::selection{background:rgba(126,211,33,.35);color:var(--ink);}
:focus-visible{outline:2px solid var(--green);outline-offset:2px;}

/* ---------- 3. 容器与网格 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.col-span-4{grid-column:span 4;}
.col-span-6{grid-column:span 6;}
.col-span-8{grid-column:span 8;}
.col-span-12{grid-column:span 12;}
.col-start-2{grid-column-start:2;}
.col-start-3{grid-column-start:3;}
.col-start-4{grid-column-start:4;}
.stack > * + *{margin-top:1.1rem;}

/* ---------- 4. 跳转与阅读进度 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-72px;
  z-index:100;
  display:inline-block;
  padding:10px 16px;
  background:var(--green);
  color:var(--forest);
  font-family:var(--font-index);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:10px;}

.progress-rail{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:3px;
  z-index:80;
  background:rgba(20,24,26,.22);
  pointer-events:none;
}
.progress-bar{
  display:block;
  width:100%;
  height:100%;
  background:var(--green);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .12s linear;
}

/* ---------- 5. 页头命令栏 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background-color:var(--deep);
  background-image:linear-gradient(90deg,rgba(244,241,232,.06) 0 1px,transparent 1px);
  background-size:25% 100%;
  background-repeat:repeat-x;
  color:var(--cream);
  border-bottom:1px solid rgba(126,211,33,.32);
}
.header-shell{
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(10px,2vw,26px);
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:none;
  color:var(--cream);
  text-decoration:none;
}
.brand-mark{
  position:relative;
  width:30px;
  height:30px;
  flex:none;
  border:1px solid rgba(126,211,33,.6);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
}
.brand-mark::before{
  content:"";
  position:absolute;
  top:6px;
  right:6px;
  width:12px;
  height:12px;
  background:var(--green);
  transform:rotate(8deg);
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:6px;
  bottom:6px;
  width:3px;
  height:11px;
  background:var(--moss);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:800;
  letter-spacing:.02em;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:rgba(244,241,232,.55);
}

/* 导航 */
.command-nav{flex:1 1 auto;min-width:0;}
.nav-list{display:flex;align-items:stretch;flex-wrap:nowrap;}
.nav-item{display:flex;min-width:0;}
.nav-item + .nav-item{border-left:1px solid rgba(244,241,232,.14);}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  padding:11px 12px;
  color:rgba(244,241,232,.74);
  font-family:var(--font-index);
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  text-decoration:none;
  white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:5px;
  height:2px;
  background:var(--green);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease);
}
.nav-link::before{
  content:"";
  position:absolute;
  top:9px;
  right:5px;
  width:4px;
  height:4px;
  background:var(--moss);
  opacity:.7;
  transition:background-color .18s var(--ease),opacity .18s var(--ease);
}
.nav-link:hover{
  color:var(--cream);
  background:rgba(244,241,232,.06);
}
.nav-link:hover::before{background:var(--green);opacity:1;}
.nav-link:hover .nav-index{color:var(--green);}
.nav-link[aria-current="page"]{color:var(--cream);}
.nav-link[aria-current="page"]::after{transform:scaleX(1);}
.nav-link[aria-current="page"]::before{background:var(--green);opacity:1;}
.nav-index{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.06em;
  color:var(--moss-soft);
  transition:color .18s var(--ease);
}
.nav-link[aria-current="page"] .nav-index{color:var(--green);}
.nav-label{font-size:13px;}

/* 页头工具区 */
.header-tools{
  display:flex;
  align-items:center;
  gap:10px;
  flex:none;
}
.cta-command{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 14px;
  background:var(--green);
  color:var(--forest);
  border:1px solid var(--green);
  font-family:var(--font-index);
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  white-space:nowrap;
  clip-path:polygon(0 0,100% 0,100% 100%,7px 100%,0 calc(100% - 7px));
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.cta-command::after{
  content:"";
  width:6px;
  height:6px;
  border-top:1px solid currentColor;
  border-right:1px solid currentColor;
  transform:rotate(45deg);
  margin-left:2px;
}
.cta-command:hover{background:var(--green-soft);border-color:var(--green-soft);}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 11px;
  background:transparent;
  border:1px solid rgba(244,241,232,.32);
  color:var(--cream);
  cursor:pointer;
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--green);background:rgba(126,211,33,.12);}
.nav-toggle-bars{
  display:block;
  position:relative;
  width:18px;
  height:12px;
  flex:none;
}
.nav-toggle-bars span{
  position:absolute;
  left:0;
  right:0;
  height:1px;
  background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle-bars span:nth-child(1){top:0;}
.nav-toggle-bars span:nth-child(2){top:5.5px;}
.nav-toggle-bars span:nth-child(3){bottom:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(5.5px) 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(-5.5px) rotate(-45deg);}
.nav-toggle-text{
  font-family:var(--font-index);
  font-size:12px;
  font-weight:600;
  letter-spacing:.08em;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  background:var(--forest);
  color:var(--cream);
  margin-top:clamp(48px,7vw,96px);
}
.footer-branch{
  height:12px;
  background-color:var(--forest);
  background-image:
    repeating-linear-gradient(115deg,rgba(179,106,74,.55) 0 1px,transparent 1px 14px),
    repeating-linear-gradient(65deg,rgba(126,211,33,.3) 0 1px,transparent 1px 19px);
}
.footer-shell{
  padding-top:clamp(34px,5vw,60px);
  padding-bottom:26px;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(240px,1.05fr) minmax(0,2fr);
  gap:clamp(24px,4vw,64px);
  padding-bottom:26px;
  border-bottom:1px solid rgba(244,241,232,.14);
}
.footer-identity{min-width:0;}
.footer-brand-name{
  font-family:var(--font-display);
  font-size:22px;
  font-weight:800;
  letter-spacing:.01em;
  margin:0 0 4px;
}
.footer-brand-sub{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--moss-soft);
  margin:0 0 14px;
}
.footer-note{
  font-size:13.5px;
  line-height:1.8;
  color:rgba(244,241,232,.72);
  max-width:36ch;
  margin:0;
}
.footer-columns{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,3vw,32px);
}
.footer-col{min-width:0;}
.footer-col-title{
  font-family:var(--font-index);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--green);
  margin:0 0 12px;
  padding-bottom:8px;
  border-bottom:1px solid rgba(126,211,33,.28);
}
.footer-links{display:grid;gap:8px;}
.footer-link{
  display:inline-block;
  font-size:14px;
  color:rgba(244,241,232,.8);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible{color:var(--green);border-bottom-color:var(--green);}
.footer-contact{
  display:grid;
  gap:6px;
  margin-top:22px;
}
.footer-contact-line{
  margin:0;
  font-size:13px;
  line-height:1.8;
  color:rgba(244,241,232,.72);
}
.footer-contact-label{
  display:inline-block;
  min-width:68px;
  margin-right:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--moss-soft);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:8px 28px;
  margin-top:22px;
  padding-top:18px;
  border-top:1px solid rgba(244,241,232,.14);
}
.footer-legal{
  margin:0;
  font-size:12.5px;
  color:rgba(244,241,232,.68);
}
.footer-update{
  margin:0;
  font-size:12.5px;
  color:rgba(244,241,232,.62);
}
.footer-year{
  font-family:var(--font-mono);
  color:var(--moss-soft);
  margin-left:8px;
}

/* ---------- 7. 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 18px;
  background:transparent;
  border:1px solid var(--deep);
  color:var(--deep);
  font-family:var(--font-index);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 7px),calc(100% - 7px) 100%,0 100%);
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn-primary{background:var(--green);border-color:var(--green);color:var(--forest);}
.btn-primary:hover{background:var(--green-soft);border-color:var(--green-soft);}
.btn-ghost{border-color:var(--line);color:var(--deep);}
.btn-ghost:hover{border-color:var(--deep);background:var(--paper);}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{margin:clamp(18px,3vw,28px) 0 0;}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--stone);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--line);}
.breadcrumb-item a{
  color:var(--stone);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.breadcrumb-item a:hover{color:var(--deep);border-bottom-color:var(--green);}
.breadcrumb-current{color:var(--ink);}

/* ---------- 9. 章节头 ---------- */
.section-head{
  position:relative;
  padding-left:16px;
  margin:0 0 18px;
}
.section-head::before{
  content:"";
  position:absolute;
  left:0;
  top:.32em;
  bottom:.32em;
  width:1px;
  background:var(--line);
  transition:width .22s var(--ease),background-color .22s var(--ease);
}
[data-section].is-current .section-head::before,
.section-head.is-current::before{
  width:3px;
  background:var(--green);
}
.section-index{
  display:block;
  margin:0 0 6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--moss);
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(20px,2.4vw,26px);
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--deep);
}
.section-note{
  margin:8px 0 0;
  max-width:62ch;
  font-size:13.5px;
  color:var(--stone);
}
.lede{
  font-size:17px;
  line-height:1.8;
  max-width:64ch;
}

/* ---------- 10. 面板与卡片 ---------- */
.panel{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  padding:clamp(16px,2.4vw,24px);
}
.panel::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(20,24,26,.022) 0 1px,transparent 1px 4px);
}
.panel-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  padding-bottom:10px;
  margin-bottom:14px;
  border-bottom:1px solid var(--line);
}
.panel-title{
  margin:0;
  font-family:var(--font-display);
  font-size:17px;
  font-weight:800;
  color:var(--deep);
}
.panel-meta{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--stone);
  white-space:nowrap;
}
.card{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  padding:20px 20px 20px 22px;
}
.card::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:3px;
  background:var(--green);
}
.card--clay::before{background:var(--clay);}
.card--moss::before{background:var(--moss);}
.card-tag{
  display:inline-block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--stone);
}
.card-title{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:800;
  color:var(--deep);
}
.card-body{margin:0;font-size:15px;line-height:1.75;}
.card-foot{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top:14px;
  padding-top:12px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--stone);
}

/* ---------- 11. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  background:var(--cream);
  border:1px solid var(--line);
  color:var(--stone);
  font-family:var(--font-index);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.06em;
}
.tag-moss{
  background:rgba(107,127,90,.14);
  border-color:rgba(107,127,90,.5);
  color:#3F4C36;
}
.tag-clay{
  background:rgba(179,106,74,.14);
  border-color:rgba(179,106,74,.5);
  color:#7A3F27;
}
.tag-amber{
  background:rgba(255,138,61,.16);
  border-color:var(--amber);
  color:#8A4315;
}

/* ---------- 12. 索引表 ---------- */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;}
.index-table{
  width:100%;
  min-width:560px;
  border-collapse:collapse;
  font-size:14px;
}
.index-table th{
  padding:10px 12px;
  text-align:left;
  font-family:var(--font-index);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--stone);
  border-bottom:1px solid var(--ink);
  background:transparent;
  white-space:nowrap;
}
.index-table td{
  padding:11px 12px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
  line-height:1.7;
}
.index-table tbody tr{transition:background-color .16s var(--ease);}
.index-table tbody tr:hover{background:rgba(126,211,33,.08);}
.index-table .num{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--deep);
  white-space:nowrap;
}

/* ---------- 13. 图片容器 ---------- */
.figure-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  background:var(--paper);
  border:1px solid var(--line);
}
.figure-frame img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(20,24,26,.03) 0 1px,transparent 1px 6px);
}
.figure-frame--wide{aspect-ratio:16/9;}
.figure-frame--tall{aspect-ratio:4/5;}
.figure-frame--square{aspect-ratio:1/1;}
.figure-placeholder{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  background-image:repeating-linear-gradient(135deg,rgba(107,127,90,.1) 0 12px,transparent 12px 24px);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--stone);
  text-align:center;
  padding:12px;
}
.figure-caption{
  margin:8px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--stone);
}

/* ---------- 14. 折叠说明 / 纠错入口 ---------- */
.disclosure{
  background:var(--paper);
  border:1px solid var(--line);
}
.disclosure-toggle{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  width:100%;
  padding:13px 16px;
  background:transparent;
  border:0;
  text-align:left;
  cursor:pointer;
  color:var(--deep);
  font-family:var(--font-index);
  font-size:13px;
  font-weight:700;
  letter-spacing:.05em;
  transition:background-color .18s var(--ease);
}
.disclosure-toggle:hover{background:rgba(126,211,33,.1);}
.disclosure-toggle::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:15px;
  color:var(--moss);
}
.disclosure-toggle[aria-expanded="true"]::after{content:"–";color:var(--green);}
.disclosure-panel{
  padding:0 16px 16px;
  border-top:1px solid var(--line);
  font-size:14.5px;
  line-height:1.8;
  color:var(--ink);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1140px) and (min-width:901px){
  .nav-link{padding:10px 9px;gap:6px;}
  .nav-link::after{left:9px;right:9px;}
  .nav-label{font-size:12.5px;}
  .cta-command{font-size:12px;padding:8px 11px;}
}

@media (max-width:900px){
  :root{--header-h:58px;--gap:16px;}
  .header-shell{gap:10px;padding-left:14px;padding-right:14px;}
  .brand-mark{width:26px;height:26px;}
  .brand-name{font-size:15px;}
  .brand-sub{font-size:9px;letter-spacing:.12em;}
  .nav-toggle{display:inline-flex;}
  .cta-command{padding:8px 11px;font-size:12px;letter-spacing:.04em;}

  .command-nav{
    position:fixed;
    top:auto;
    left:0;
    right:0;
    bottom:0;
    z-index:70;
    max-height:82vh;
    overflow-y:auto;
    padding:10px 14px calc(16px + env(safe-area-inset-bottom));
    background:var(--deep);
    border-top:1px solid rgba(126,211,33,.42);
    transform:translateY(103%);
    visibility:hidden;
    transition:transform .22s var(--ease),visibility .22s var(--ease);
  }
  .command-nav[data-open]{transform:translateY(0);visibility:visible;}
  .nav-list{flex-direction:column;align-items:stretch;}
  .nav-item + .nav-item{border-left:0;border-top:1px solid rgba(244,241,232,.13);}
  .nav-link{width:100%;justify-content:flex-start;padding:14px 4px;gap:10px;}
  .nav-link::after{left:4px;right:auto;width:44px;bottom:8px;}
  .nav-link::before{top:20px;right:6px;width:6px;height:6px;}
  .nav-label{font-size:15px;}

  .grid{grid-template-columns:repeat(4,minmax(0,1fr));}
  .col-span-4,.col-span-6,.col-span-8,.col-span-12{grid-column:span 4;}
  .col-start-2,.col-start-3,.col-start-4{grid-column-start:1;}

  .footer-top{grid-template-columns:1fr;gap:26px;}
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-note{max-width:52ch;}
}

@media (max-width:560px){
  .brand-sub{display:none;}
  .footer-columns{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .section-head{padding-left:12px;}
  .lede{font-size:16px;}
}

@media (min-width:1441px){
  :root{--shell:1280px;}
}

/* ---------- 16. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html{scroll-behavior:auto;}
  .progress-bar{transition:none;}
  .nav-link::after{transition:none;}
  .command-nav{transition:none;}
}