/* ============================================================
   鼎盛指南 · /assets/site.css
   共享外壳：框架式左侧导航、四段式页脚、通用组件
   ============================================================ */

/* ---------- 0. 令牌 ---------- */
:root{
  --ink-900:#0B1730;
  --ink-850:#0E1D3A;
  --ink-800:#122443;
  --ink-700:#1D3557;
  --ink-500:#7E93B4;
  --paper:#E9EFF7;
  --paper-soft:#F5F7FA;
  --amber:#E3A33B;
  --amber-deep:#A9701F;
  --amber-soft:#F0B45A;
  --celadon:#4FB79A;
  --celadon-deep:#2E7F6B;
  --celadon-lift:#7FE0C4;
  --scrim:rgba(11,23,48,.72);
  --line:rgba(126,147,180,.24);
  --line-strong:rgba(126,147,180,.45);
  --rail-w:272px;
  --cut:14px;
  --shell:1240px;
  --gutter:clamp(18px,4vw,54px);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:92px;
}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,ul,ol,dl,dd,pre{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;}
table{border-collapse:collapse;}
a{color:inherit;}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px;}

/* ---------- 2. 页面基底 ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    repeating-linear-gradient(to right,rgba(126,147,180,.055) 0 1px,transparent 1px 24px),
    repeating-linear-gradient(to bottom,rgba(126,147,180,.055) 0 1px,transparent 1px 24px),
    radial-gradient(120% 62% at 82% -12%,rgba(29,53,87,.75) 0%,rgba(11,23,48,0) 68%);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16.5px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.is-nav-open{overflow:hidden;}

#main-content{display:block;padding-top:76px;}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4{font-weight:900;line-height:1.2;letter-spacing:-.012em;color:var(--paper);}
h1{font-size:clamp(2.1rem,5vw,3.4rem);}
h2{font-size:clamp(1.5rem,2.8vw,2.1rem);}
h3{font-size:1.25rem;font-weight:700;}
h4{font-size:1.05rem;font-weight:700;}
p+p{margin-top:.9em;}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.06em;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--celadon);
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;}

/* ---------- 4. 布局工具 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.grid{display:grid;gap:clamp(16px,2.4vw,30px);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.grid--2{grid-template-columns:1fr;}
.span-4,.span-5,.span-6,.span-7,.span-8{grid-column:1 / -1;}

/* ---------- 5. 跳过链接 ---------- */
.skip-link{
  position:fixed;z-index:300;top:10px;left:10px;
  padding:10px 16px;
  background:var(--amber);color:#1A1206;
  font-size:14px;font-weight:700;letter-spacing:.04em;
  text-decoration:none;
  transform:translateY(-220%);
  transition:transform .18s ease;
}
.skip-link:focus-visible{transform:none;outline:2px solid var(--paper);outline-offset:2px;}

/* ---------- 6. 头部 / 框架导航栏 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:80;
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(11,23,48,.97),rgba(11,23,48,.9));
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.rail{
  display:flex;flex-direction:column;gap:14px;
  padding:12px 16px 16px;
}
.rail__top{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
}
.rail__foot{
  display:flex;flex-direction:column;gap:12px;
}
.rail-cta{width:100%;}
.rail__meta{
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--ink-500);
}

/* 品牌字标 */
.brand{
  display:inline-flex;align-items:center;gap:12px;
  text-decoration:none;color:var(--paper);
}
.brand__mark{
  position:relative;flex:0 0 34px;
  width:34px;height:34px;
  background:linear-gradient(140deg,var(--amber-soft),var(--amber-deep));
  clip-path:polygon(0 0,100% 0,100% 100%,38% 100%,0 62%);
}
.brand__mark::before{
  content:"";position:absolute;inset:5px;
  background:var(--ink-900);
  clip-path:polygon(0 0,100% 0,100% 100%,38% 100%,0 62%);
}
.brand__mark::after{
  content:"";position:absolute;left:12px;top:9px;width:9px;height:2px;
  background:var(--amber);
  box-shadow:0 5px 0 var(--amber),0 10px 0 rgba(227,163,59,.45);
}
.brand__name{
  display:block;font-family:var(--font-display);
  font-size:19px;font-weight:900;line-height:1.1;letter-spacing:.06em;
}
.brand__sub{
  display:block;margin-top:3px;
  font-family:var(--font-mono);font-size:9.5px;font-weight:500;
  letter-spacing:.22em;color:var(--ink-500);
}
.brand:hover .brand__name{color:var(--amber);}

/* 版本铭牌 */
.version-plate{
  display:inline-flex;align-items:center;gap:8px;
  width:max-content;
  padding:4px 9px;
  border:1px solid rgba(227,163,59,.42);
  background:rgba(227,163,59,.08);
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.14em;text-transform:uppercase;color:var(--amber);
}
.version-plate__k{color:rgba(227,163,59,.7);letter-spacing:.2em;}
.version-plate__v{letter-spacing:.06em;}

/* 移动导航按钮 */
.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 13px;min-height:44px;
  background:transparent;color:var(--paper);
  border:1px solid var(--line-strong);
  cursor:pointer;
  transition:border-color .18s ease,color .18s ease,background-color .18s ease;
}
.nav-toggle:hover{border-color:var(--amber);color:var(--amber);}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle__bars span{
  display:block;height:2px;background:var(--amber);
  transition:transform .2s ease,opacity .2s ease,width .2s ease;
}
.nav-toggle__bars span:nth-child(2){width:70%;}
.nav-toggle__text{font-size:13px;font-weight:600;letter-spacing:.08em;}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* 导航列表 */
.rail-nav{display:block;border-top:1px solid var(--line);padding-top:10px;}
.rail-nav__list{display:flex;flex-direction:column;gap:2px;}
.rail-nav__link{
  display:flex;align-items:center;gap:12px;
  padding:12px 14px 12px 12px;
  border-left:2px solid transparent;
  color:rgba(233,239,247,.82);
  font-size:17px;font-weight:500;text-decoration:none;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.rail-nav__link:hover{
  color:#fff;
  background:rgba(29,53,87,.6);
  border-left-color:var(--celadon);
}
.rail-nav__link[aria-current="page"]{
  color:#fff;
  background:linear-gradient(90deg,rgba(227,163,59,.2),rgba(227,163,59,0));
  border-left-color:var(--amber);
}
.rail-nav__idx{
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.12em;color:var(--ink-500);
}
.rail-nav__link:hover .rail-nav__idx{color:var(--celadon);}
.rail-nav__link[aria-current="page"] .rail-nav__idx{color:var(--amber);}

/* 移动端抽屉闭合态 */
.version-plate{display:none;}
.rail-nav,.rail__foot{display:none;}
.site-header[data-open]{
  inset:0;overflow-y:auto;border-bottom:none;
  background:var(--ink-900);
  -webkit-backdrop-filter:none;
  backdrop-filter:none;
}
.site-header[data-open] .rail{min-height:100%;padding-bottom:32px;}
.site-header[data-open] .version-plate{display:inline-flex;}
.site-header[data-open] .rail-nav,
.site-header[data-open] .rail__foot{display:flex;flex-direction:column;gap:12px;}
.site-header[data-open] .rail__foot{
  margin-top:auto;border-top:1px solid var(--line);padding-top:18px;
}

/* ---------- 7. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:11px 20px;
  font-family:var(--font-body);font-size:14px;font-weight:700;
  letter-spacing:.06em;line-height:1.3;
  text-decoration:none;text-align:center;
  border:2px solid transparent;background:transparent;color:var(--paper);
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn--primary{background:var(--amber);border-color:var(--amber);color:#1A1206;}
.btn--primary:hover{background:var(--amber-soft);border-color:var(--amber-soft);transform:translateY(-1px);}
.btn--ghost{border-color:var(--line-strong);color:var(--paper);}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber);}
.btn--quiet{min-height:0;padding:0;color:var(--celadon);border:0;}
.btn--quiet:hover{color:var(--celadon-lift);}
.btn--block{display:flex;width:100%;}
.btn--sm{min-height:36px;padding:7px 14px;font-size:12.5px;letter-spacing:.1em;}

/* ---------- 8. 面板 / 标签 / 图片容器 ---------- */
.panel{
  --cut:14px;
  position:relative;
  padding:clamp(18px,2.6vw,30px);
  border:2px solid transparent;
  background:
    linear-gradient(var(--ink-800),var(--ink-800)) padding-box,
    linear-gradient(140deg,var(--ink-700),rgba(126,147,180,.42) 58%,rgba(227,163,59,.28)) border-box;
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.panel--light{
  background:
    linear-gradient(var(--paper-soft),var(--paper-soft)) padding-box,
    linear-gradient(140deg,#C7D3E4,#E9EFF7 60%,rgba(227,163,59,.45)) border-box;
  color:#16233B;
}
.panel--hoverable{transition:transform .22s ease,background-color .22s ease;}
.panel--hoverable:hover{transform:translateY(-3px);}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;
  color:var(--celadon);
  background:rgba(79,183,154,.12);
  border:1px solid rgba(79,183,154,.4);
}
.tag--amber{color:var(--amber);background:rgba(227,163,59,.12);border-color:rgba(227,163,59,.42);}
.tag--muted{color:var(--ink-500);background:rgba(126,147,180,.1);border-color:var(--line);}

.figure-frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(140deg,var(--ink-800),var(--ink-700) 70%,rgba(29,53,87,.55));
}
.figure-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(135deg,rgba(126,147,180,.09) 0 1px,transparent 1px 10px);
}
.figure-frame--plain::after{display:none;}
.figure-frame img,.figure-frame__img{display:block;width:100%;height:100%;object-fit:cover;}
.aspect-16x9{aspect-ratio:16/9;}
.aspect-4x3{aspect-ratio:4/3;}
.aspect-1x1{aspect-ratio:1/1;}
.aspect-3x4{aspect-ratio:3/4;}
.figure-frame__caption{
  margin-top:10px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.08em;color:var(--ink-500);
}
.figure-frame__badge{position:absolute;left:12px;top:12px;z-index:2;}

/* ---------- 9. 面包屑 / 正文容器 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;color:var(--ink-500);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:rgba(126,147,180,.5);}
.breadcrumb a{color:var(--ink-500);text-decoration:none;transition:color .16s ease;}
.breadcrumb a:hover{color:var(--amber);}
.breadcrumb [aria-current="page"]{color:var(--paper);}

.prose{max-width:70ch;}
.prose>*+*{margin-top:1em;}
.prose h2{margin-top:2em;font-size:clamp(1.35rem,2.4vw,1.85rem);}
.prose h3{margin-top:1.6em;}
.prose ul{padding-left:1.15em;}
.prose ul li{position:relative;list-style:none;}
.prose ul li::before{
  content:"";position:absolute;left:-1.05em;top:.75em;
  width:7px;height:2px;background:var(--amber);
}
.prose ol{padding-left:1.4em;list-style:decimal;}
.prose ol li::marker{color:var(--amber);font-family:var(--font-mono);}
.prose a{color:var(--amber);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
.prose a:hover{color:var(--amber-soft);}
.prose strong{font-weight:700;color:#fff;}
.prose blockquote{
  border-left:2px solid var(--celadon);
  padding-left:16px;color:rgba(233,239,247,.78);
}
.prose code{
  font-family:var(--font-mono);font-size:.92em;
  padding:1px 6px;background:rgba(126,147,180,.14);border:1px solid var(--line);
}

/* ---------- 10. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(18,36,67,.55),rgba(11,23,48,.98) 68%);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;
  width:min(260px,42%);height:2px;
  background:linear-gradient(90deg,var(--amber),transparent);
}
.site-footer__grid{
  max-width:var(--shell);margin-inline:auto;
  padding:clamp(34px,4.6vw,58px) var(--gutter) clamp(22px,3vw,34px);
  display:grid;gap:clamp(26px,3.4vw,44px);
  grid-template-columns:1fr;
}
.footer-nav,.footer-contact,.footer-legal{min-width:0;}
.footer-title{
  margin-bottom:16px;padding-bottom:10px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--amber);
}
.footer-list{display:flex;flex-direction:column;gap:9px;}
.footer-list a{
  color:rgba(233,239,247,.78);font-size:14.5px;text-decoration:none;
  transition:color .16s ease;
}
.footer-list a:hover{color:var(--amber);}

.footer-brand__link{
  display:inline-block;
  font-family:var(--font-display);font-size:22px;font-weight:900;
  letter-spacing:.08em;color:var(--paper);text-decoration:none;
  transition:color .16s ease;
}
.footer-brand__link:hover{color:var(--amber);}
.footer-brand__desc{
  margin-top:12px;max-width:34ch;
  font-size:14px;line-height:1.8;color:rgba(233,239,247,.7);
}
.footer-brand__plate{
  display:inline-flex;align-items:center;gap:8px;margin-top:16px;
  padding:4px 10px;
  border:1px solid rgba(227,163,59,.4);
  background:rgba(227,163,59,.08);
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.14em;text-transform:uppercase;color:var(--amber);
}
.footer-brand__plate-sep{color:rgba(126,147,180,.6);}

.footer-list--contact{gap:12px;}
.footer-contact__row{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 10px;
  font-size:14px;
}
.footer-contact__k{
  min-width:38px;
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.14em;text-transform:uppercase;color:var(--ink-500);
}
.footer-contact__v{color:rgba(233,239,247,.86);word-break:break-word;}
.footer-contact__note{
  margin-top:14px;padding-left:10px;
  border-left:2px solid var(--celadon-deep);
  font-size:12.5px;line-height:1.7;color:var(--ink-500);
}
.copy-btn{
  display:inline-flex;align-items:center;
  padding:2px 8px;
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;letter-spacing:.1em;
  color:var(--celadon);background:transparent;
  border:1px solid rgba(79,183,154,.45);
  cursor:pointer;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.copy-btn:hover{background:rgba(79,183,154,.16);color:var(--celadon-lift);}
.copy-btn[data-copied]{background:var(--celadon);border-color:var(--celadon);color:var(--ink-900);}

.footer-legal__icp{
  margin-top:18px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.06em;color:var(--ink-500);
}
.footer-legal__copy{margin-top:6px;font-size:12.5px;color:var(--ink-500);}

.site-footer__base{
  max-width:var(--shell);margin-inline:auto;
  padding:16px var(--gutter) 26px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.12em;text-transform:uppercase;color:var(--ink-500);
}
.site-footer__base-brand{letter-spacing:.14em;}
.site-footer__base-plate{color:rgba(227,163,59,.75);}

/* ---------- 11. 返回顶部 ---------- */
.to-top{
  position:fixed;right:18px;bottom:18px;z-index:90;
  width:52px;height:52px;padding:0;
  display:none;place-items:center;
  border:0;border-radius:50%;
  background:var(--ink-800);color:var(--paper);
  cursor:pointer;
  box-shadow:0 10px 26px rgba(0,0,0,.42);
  transition:transform .18s ease,background-color .18s ease;
}
.to-top[data-visible]{display:grid;}
.to-top:hover{transform:translateY(-2px);background:var(--ink-700);}
.to-top__ring{
  position:absolute;inset:0;border-radius:50%;
  background:conic-gradient(var(--amber) calc(var(--p,0) * 1%),rgba(126,147,180,.28) 0);
  -webkit-mask:radial-gradient(circle,transparent 0 18px,#000 19px);
  mask:radial-gradient(circle,transparent 0 18px,#000 19px);
}
.to-top__glyph{
  position:relative;z-index:1;
  font-size:17px;font-weight:700;line-height:1;color:var(--amber);
}

/* ---------- 12. 平板 ---------- */
@media (min-width:640px){
  .site-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (min-width:768px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
  .rail-nav__link{font-size:15px;}
  .site-footer__base{flex-wrap:nowrap;}
}

/* ---------- 13. 桌面：框架式竖排导航 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w);}
  html{scroll-padding-top:24px;}
  #main-content{padding-top:0;}

  .site-header{
    inset:0 auto 0 0;width:var(--rail-w);
    border-bottom:none;border-right:1px solid var(--line);
    background:linear-gradient(180deg,#0B1730 0%,#0E1E3C 55%,#0B1730 100%);
    -webkit-backdrop-filter:none;
    backdrop-filter:none;
  }
  .site-header::after{
    content:"";position:absolute;top:0;right:-1px;
    width:2px;height:132px;
    background:linear-gradient(180deg,var(--amber),transparent);
  }
  .rail{
    height:100%;
    padding:26px 20px 22px;
    gap:20px;
  }
  .rail__top{justify-content:flex-start;}
  .nav-toggle{display:none;}
  .version-plate{display:inline-flex;}
  .rail-nav{display:block;margin-top:4px;border-top:none;padding-top:0;}
  .rail-nav__link{font-size:15px;padding:10px 12px;}
  .rail__foot{
    display:flex;flex-direction:column;gap:12px;
    margin-top:auto;
  }
  .rail__meta{padding-left:2px;}

  .site-footer__grid{grid-template-columns:1.5fr 1fr 1.5fr 1fr;}
  .to-top{right:26px;bottom:26px;}

  .span-4{grid-column:span 4;}
  .span-5{grid-column:span 5;}
  .span-6{grid-column:span 6;}
  .span-7{grid-column:span 7;}
  .span-8{grid-column:span 8;}
}

/* ---------- 14. 减少动态 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .panel--hoverable:hover,
  .btn--primary:hover,
  .to-top:hover{transform:none;}
  .skip-link{transition:none;}
}