/* ==========================================================
   PP王电子 · 共享外壳 site.css
   框架式导航 + 纵向叙事长卷 + 电路工作台色系
   ========================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,svg,video{display:block;max-width:100%;height:auto}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;margin:0;cursor:pointer}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}

/* ---------- 2. 变量 ---------- */
:root{
  --c-green:#123A2E;
  --c-cream:#F5F1E6;
  --c-deep:#0A241C;
  --c-tin:#C7D0CB;
  --c-moss:#4E7A5C;
  --c-orange:#FF6A2B;
  --c-blue:#2F6BFF;
  --c-rock:#6C7873;
  --c-clay:#B45A3C;
  --c-panel:#FFFDF7;

  --rail-w:248px;
  --gutter:72px;
  --gap:24px;
  --radius:6px;

  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,monospace;

  --progress:0;
  --line:rgba(199,208,203,.20);
  --line-dark:rgba(18,58,46,.16);
}

/* ---------- 3. 中文排版基底 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--c-green);
  background:var(--c-cream);
  padding-left:var(--rail-w);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:-.01em;
  line-height:1.12;
  margin:0 0 .5em;
  color:var(--c-green);
}
h1{font-size:clamp(2.75rem,6vw,5rem)}
h2{font-size:clamp(1.75rem,3vw,2.75rem)}
h3{font-size:1.25rem;line-height:1.45}
h4{font-size:1.0625rem;line-height:1.5}
a{color:var(--c-blue);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{color:var(--c-green)}
strong,b{font-weight:700}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:0}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:700}

/* ---------- 4. 焦点 ---------- */
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{
  outline:3px solid var(--c-blue);
  outline-offset:2px;
  border-radius:3px;
}
.site-header :where(a,button):focus-visible,
.site-footer :where(a,button):focus-visible{
  outline:3px solid var(--c-orange);
  outline-offset:3px;
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:12px;left:12px;
  z-index:200;
  transform:translateY(-180%);
  background:var(--c-orange);
  color:var(--c-deep);
  font-weight:700;
  font-size:.875rem;
  padding:12px 18px;
  border-radius:4px;
  text-decoration:none;
  transition:transform .18s ease-out;
}
.skip-link:focus,.skip-link:focus-visible{transform:none;color:var(--c-deep)}

/* ---------- 6. 头部：左侧框架栏 ---------- */
.site-header{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail-w);
  z-index:60;
  display:flex;
  background:var(--c-deep);
  color:var(--c-tin);
  border-right:1px solid var(--line);
  overflow:hidden;
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(78,122,92,.22) 0 1px,transparent 1px 52px),
    repeating-linear-gradient(0deg,rgba(78,122,92,.22) 0 1px,transparent 1px 52px);
  opacity:.55;
}
.frame-rail{
  position:relative;
  z-index:1;
  flex:1 1 auto;
  display:flex;
  flex-direction:column;
  padding:28px 20px 24px;
  overflow-y:auto;
  scrollbar-width:thin;
}
.rail-head{
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:30px;height:30px;
  flex:0 0 auto;
  background:var(--c-orange);
  color:var(--c-deep);
  font-size:.75rem;
  font-weight:700;
  border-radius:3px;
}
.brand-link{
  font-family:var(--font-display);
  font-size:1.5rem;
  font-weight:700;
  letter-spacing:.01em;
  color:var(--c-cream);
  text-decoration:none;
  line-height:1.1;
}
.brand-link:hover{color:var(--c-orange)}
.brand-tag{
  margin:12px 0 0;
  font-size:.75rem;
  line-height:1.65;
  color:var(--c-tin);
  opacity:.72;
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  min-height:44px;
  min-width:44px;
  padding:0 12px;
  background:rgba(199,208,203,.10);
  border:1px solid rgba(199,208,203,.30);
  border-radius:4px;
  color:var(--c-cream);
  font-size:.8125rem;
  font-weight:600;
}
.nav-toggle-bars{display:grid;gap:3px;width:16px}
.nav-toggle-bars i{display:block;height:2px;background:currentColor;border-radius:1px;transition:transform .18s,opacity .18s}
.nav-toggle-text{letter-spacing:.06em}
.site-header[data-open] .nav-toggle-bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars i:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.site-nav{flex:1 1 auto;margin-top:26px;counter-reset:nav}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-list a{
  position:relative;
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:0 12px;
  border-left:3px solid transparent;
  border-radius:4px;
  color:var(--c-tin);
  font-size:.9375rem;
  text-decoration:none;
  transition:background .18s,color .18s,border-color .18s;
}
.nav-list a::before{
  counter-increment:nav;
  content:counter(nav,decimal-leading-zero);
  font-family:var(--font-mono);
  font-size:.6875rem;
  color:var(--c-moss);
  transition:color .18s;
}
.nav-list a:hover{background:rgba(199,208,203,.09);color:var(--c-cream)}
.nav-list a[aria-current="page"]{
  background:rgba(255,106,43,.16);
  border-left-color:var(--c-orange);
  color:#fff;
  font-weight:600;
}
.nav-list a[aria-current="page"]::before{color:var(--c-orange)}

.rail-foot{
  margin-top:auto;
  padding-top:20px;
  border-top:1px solid var(--line);
}
.rail-label{
  margin:0 0 4px;
  font-size:.6875rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--c-moss);
}
.rail-phone{
  margin:0;
  font-size:1.125rem;
  font-weight:700;
  color:var(--c-cream);
}
.rail-hours{margin:2px 0 14px;font-size:.75rem;color:var(--c-tin);opacity:.7}
.rail-cta{width:100%}

.scroll-progress{
  position:absolute;
  top:0;right:0;bottom:0;
  width:3px;
  background:rgba(199,208,203,.10);
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  width:100%;height:100%;
  background:linear-gradient(180deg,var(--c-orange),var(--c-blue));
  transform:scaleY(var(--progress));
  transform-origin:top;
}

/* ---------- 7. 移动端底部快捷条 ---------- */
.quick-dock{display:none}

/* ---------- 8. 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 20px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-family:var(--font-body);
  font-size:.9375rem;
  font-weight:600;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:background .18s,color .18s,border-color .18s;
}
.btn--primary{background:var(--c-orange);color:var(--c-deep)}
.btn--primary:hover{background:#FF834F;color:var(--c-deep)}
.btn--ghost{background:transparent;border-color:rgba(199,208,203,.45);color:var(--c-cream)}
.btn--ghost:hover{background:rgba(199,208,203,.12);color:#fff}
.btn--outline{background:transparent;border-color:var(--c-green);color:var(--c-green)}
.btn--outline:hover{background:var(--c-green);color:var(--c-cream)}

.copy-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:32px;
  min-width:44px;
  padding:0 10px;
  margin-left:8px;
  border:1px solid var(--line);
  border-radius:3px;
  color:var(--c-tin);
  font-size:.75rem;
  transition:background .18s,color .18s,border-color .18s;
}
.copy-btn:hover{background:var(--c-orange);border-color:var(--c-orange);color:var(--c-deep)}

/* ---------- 9. 章节锚点 / 色带 / 卡片 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--c-moss);
}
.eyebrow::before{content:"";width:20px;height:2px;background:var(--c-orange)}
.band{height:10px;background:var(--c-moss)}
.band--orange{background:var(--c-orange)}
.band--blue{background:var(--c-blue)}

.surface{
  background:var(--c-panel);
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  padding:24px;
}
.tag{
  display:inline-flex;
  align-items:center;
  min-height:26px;
  padding:2px 10px;
  border-radius:999px;
  background:rgba(78,122,92,.14);
  color:var(--c-green);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.02em;
}
.tag--clay{background:rgba(180,90,60,.14);color:var(--c-clay)}
.tag--orange{background:rgba(255,106,43,.18);color:#8A3208}
.chip{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 16px;
  border:1px solid var(--line-dark);
  border-radius:999px;
  background:var(--c-panel);
  color:var(--c-green);
  font-size:.875rem;
  font-weight:600;
  transition:background .18s,color .18s,border-color .18s;
}
.chip:hover{border-color:var(--c-moss)}
.chip[aria-pressed="true"]{
  background:var(--c-orange);
  border-color:var(--c-orange);
  color:var(--c-deep);
}

/* ---------- 10. 布局容器与网格 ---------- */
.wrap{
  width:100%;
  max-width:1440px;
  margin:0 auto;
  padding-inline:var(--gutter);
}
.narrow{max-width:760px}
.grid12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}
#main-content{display:block;scroll-margin-top:80px}

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs{padding:20px 0 0;font-size:.8125rem;color:var(--c-rock)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--c-rock);opacity:.6}
.breadcrumbs a{color:var(--c-rock);text-decoration:none}
.breadcrumbs a:hover{color:var(--c-blue);text-decoration:underline}
.breadcrumbs [aria-current="page"]{color:var(--c-green);font-weight:600}

/* ---------- 12. 图片容器 ---------- */
.figure{
  position:relative;
  margin:0;
  overflow:hidden;
  border-radius:var(--radius);
  border:1px solid var(--line-dark);
  background-color:var(--c-deep);
  background-image:
    repeating-linear-gradient(90deg,rgba(199,208,203,.10) 0 1px,transparent 1px 30px),
    repeating-linear-gradient(0deg,rgba(199,208,203,.10) 0 1px,transparent 1px 30px);
}
.figure img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.figure--4x3{aspect-ratio:4/3}
.figure--16x9{aspect-ratio:16/9}
.figure--1x1{aspect-ratio:1/1}
.figure--21x9{aspect-ratio:21/9}
.figure__label{
  position:absolute;
  left:0;bottom:0;
  z-index:2;
  padding:6px 12px;
  background:var(--c-deep);
  color:var(--c-tin);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
}

/* ---------- 13. 表单 ---------- */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:20px}
.field-label{font-size:.875rem;font-weight:600;color:var(--c-green)}
.field-input{
  width:100%;
  min-height:44px;
  padding:10px 12px;
  border:1px solid rgba(18,58,46,.28);
  border-radius:var(--radius);
  background:var(--c-panel);
  color:var(--c-green);
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.5;
}
.field-input:focus{border-color:var(--c-blue)}
.field-error{margin:0;font-size:.8125rem;color:var(--c-clay);font-weight:600}

/* ---------- 14. 章节索引（页面阶段使用） ---------- */
.toc-list{display:flex;flex-direction:column;gap:2px}
.toc-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:0 12px;
  border-left:2px solid var(--line-dark);
  color:var(--c-rock);
  font-size:.875rem;
  text-decoration:none;
  transition:color .18s,border-color .18s,background .18s;
}
.toc-list a:hover{color:var(--c-green);background:rgba(78,122,92,.08)}
.toc-list a[aria-current="true"]{
  color:var(--c-green);
  border-left-color:var(--c-orange);
  font-weight:600;
  background:rgba(255,106,43,.08);
}

/* ---------- 15. 显现 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(12px)}
.js [data-reveal].is-in{opacity:1;transform:none;transition:opacity .24s ease-out,transform .24s ease-out}

/* ---------- 16. 页脚 ---------- */
.site-footer{
  background:var(--c-deep);
  color:var(--c-tin);
  margin-top:96px;
}
.footer-inner{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1.6fr);
  gap:48px;
  max-width:1440px;
  margin:0 auto;
  padding:64px var(--gutter) 48px;
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.footer-name{
  margin:0;
  font-family:var(--font-display);
  font-size:1.75rem;
  font-weight:700;
  letter-spacing:.01em;
  color:var(--c-cream);
  line-height:1.1;
}
.footer-line{margin:0;font-size:.875rem;line-height:1.8;color:var(--c-tin);opacity:.82;max-width:34em}
.footer-col-title{
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--c-moss);
  line-height:1.4;
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-list a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  color:var(--c-tin);
  font-size:.9375rem;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s,border-color .18s;
}
.footer-list a:hover{color:var(--c-cream);border-bottom-color:var(--c-orange)}
.footer-contact .footer-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 10px;
  font-size:.875rem;
  line-height:1.7;
}
.footer-label{
  flex:0 0 auto;
  min-width:40px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.1em;
  color:var(--c-moss);
}
.footer-strong{color:var(--c-cream);font-size:.9375rem;text-decoration:none}
a.footer-strong:hover{color:var(--c-orange);text-decoration:underline}
.footer-text{color:var(--c-tin);opacity:.9;flex:1 1 200px}
.footer-note{
  margin:14px 0 0;
  font-size:.75rem;
  line-height:1.75;
  color:var(--c-rock);
  max-width:32em;
}
.footer-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:16px 32px;
  max-width:1440px;
  margin:0 auto;
  padding:20px var(--gutter) 44px;
  border-top:1px solid var(--line);
  font-size:.8125rem;
  color:var(--c-rock);
}
.footer-update{margin:0;flex:1 1 260px}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-legal a{color:var(--c-tin);font-size:.8125rem;text-decoration:none}
.footer-legal a:hover{color:var(--c-orange);text-decoration:underline}
.footer-copy{margin:0;margin-left:auto;color:var(--c-rock);font-size:.75rem}

/* ---------- 17. 平板 ---------- */
@media (max-width:1279px){
  :root{--gutter:44px;--rail-w:228px}
  .footer-inner{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:40px}
  .footer-contact{grid-column:1/-1}
}

/* ---------- 18. 移动端：顶部横条 + 底部快捷条 ---------- */
@media (max-width:1023px){
  :root{--gutter:26px}
  body{padding-left:0;padding-top:72px;padding-bottom:calc(64px + env(safe-area-inset-bottom))}

  .site-header{
    position:fixed;
    top:0;left:0;right:0;bottom:auto;
    width:auto;height:auto;
    display:block;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .frame-rail{
    flex-direction:row;
    flex-wrap:wrap;
    align-items:center;
    padding:10px 18px;
    overflow:visible;
  }
  .rail-head{width:100%;gap:10px}
  .brand-link{font-size:1.25rem}
  .brand-tag{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    flex:0 0 100%;
    display:none;
    margin-top:12px;
    padding-top:12px;
    border-top:1px solid var(--line);
  }
  .site-header[data-open] .site-nav{display:block}
  .nav-list{flex-direction:row;flex-wrap:wrap;gap:6px}
  .nav-list li{flex:1 1 46%}
  .nav-list a{
    min-height:48px;
    border-left:0;
    border-bottom:2px solid transparent;
    background:rgba(199,208,203,.06);
  }
  .nav-list a[aria-current="page"]{
    border-left:0;
    border-bottom-color:var(--c-orange);
  }

  .rail-foot{
    display:none;
    flex:0 0 100%;
    flex-direction:column;
    align-items:flex-start;
    gap:4px;
    margin-top:12px;
    padding-top:12px;
    border-top:1px solid var(--line);
  }
  .site-header[data-open] .rail-foot{display:flex}
  .rail-cta{width:auto;margin-top:8px}

  .quick-dock{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:1px;
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:70;
    background:#081D17;
    border-top:1px solid var(--line);
    padding-bottom:env(safe-area-inset-bottom);
  }
  .dock-item{
    display:flex;
    align-items:center;
    justify-content:center;
    min-height:56px;
    color:var(--c-tin);
    font-size:.8125rem;
    font-weight:600;
    letter-spacing:.06em;
    text-decoration:none;
    background:transparent;
  }
  .dock-item:hover{background:rgba(199,208,203,.10)}
  .dock-item--accent{background:var(--c-orange);color:var(--c-deep)}
  .dock-item--accent:hover{background:#FF834F;color:var(--c-deep)}
  .dock-label{line-height:1}

  .scroll-progress{
    top:auto;left:0;right:0;bottom:0;
    width:auto;height:3px;
  }
  .scroll-progress-bar{
    width:100%;height:100%;
    transform:scaleX(var(--progress));
    transform-origin:left;
  }

  .grid12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-4,.col-5,.col-7,.col-8,.col-12{grid-column:1/-1}

  .site-footer{margin-top:64px}
  .footer-inner{grid-template-columns:1fr;gap:32px;padding:44px var(--gutter) 36px}
  .footer-contact{grid-column:auto}
  .footer-meta{flex-direction:column;align-items:flex-start;gap:12px;padding:20px var(--gutter) 40px}
  .footer-copy{margin-left:0}
}

/* ---------- 19. 小屏 ---------- */
@media (max-width:599px){
  :root{--gutter:20px}
  body{font-size:17px}
  .surface{padding:18px}
  .nav-list li{flex:1 1 100%}
  .figure--21x9{aspect-ratio:16/9}
}

/* ---------- 20. 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;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .scroll-progress-bar{transition:none}
  .skip-link{transition:none}
}