/* ============================================================
   安信10指南 · /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 蓝图网格 / 页头边框 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ---------- 2. 变量 ---------- */
:root{
  --ink-900:#0A1726;
  --ink-800:#10263A;
  --ink-700:#16324C;
  --line:#1B3A54;
  --green:#00E08A;
  --green-text:#17B978;
  --silver:#C9D2DA;
  --graphite:#8C97A3;
  --paper:#F4F6F8;
  --amber:#FFA530;
  --mint:#6FE3C4;

  --rail-w:112px;
  --top-h:64px;
  --shell-max:1280px;

  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei","Source Han Sans SC",sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","IBM Plex Mono",Menlo,Consolas,monospace;
  --radius:2px;
}

/* ---------- 3. 基底与中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  color:var(--silver);
  background-color:var(--ink-900);
  background-image:
    linear-gradient(rgba(27,58,84,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(27,58,84,.55) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
  background-position:center top;
  padding-top:var(--top-h);
  padding-left:var(--rail-w);
  min-height:100vh;
  overflow-x:hidden;
}

.display{
  font-size:clamp(2.4rem,6vw,5rem);
  line-height:1.06;
  letter-spacing:-.02em;
  font-weight:900;
  color:var(--paper);
  margin:0 0 18px;
}
.h2{
  font-size:clamp(1.5rem,2.6vw,2.1rem);
  line-height:1.3;
  letter-spacing:-.01em;
  font-weight:900;
  color:var(--paper);
  margin:0 0 14px;
}
.h3{
  font-size:1.12rem;
  font-weight:700;
  color:var(--paper);
  margin:0 0 8px;
}
.lede{
  font-size:clamp(1rem,1.3vw,1.12rem);
  color:var(--silver);
  max-width:60ch;
  margin:0 0 20px;
}
.mono{font-family:var(--font-mono);letter-spacing:.08em;font-size:.92em}
.annotation{
  font-size:12px;
  letter-spacing:.3em;
  color:var(--graphite);
  text-transform:uppercase;
}
.eyebrow,.coord{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  color:var(--green-text);
  text-transform:uppercase;
}
.eyebrow::before,.coord::before{
  content:"";
  width:6px;height:6px;
  background:var(--green);
  box-shadow:0 0 10px rgba(0,224,138,.85);
}
.path{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--green-text);
  text-transform:uppercase;
}
.path::after{
  content:"";
  display:inline-block;
  width:8px;height:1em;
  margin-left:7px;
  vertical-align:-2px;
  background:var(--green);
  animation:cursor-blink 1.2s steps(1,end) infinite;
}

/* ---------- 4. 焦点与动效基线 ---------- */
:focus-visible{
  outline:2px solid var(--green);
  outline-offset:3px;
  border-radius:var(--radius);
}
@keyframes cursor-blink{0%,49%{opacity:1}50%,100%{opacity:0}}
@keyframes pulse-dot{
  0%,100%{box-shadow:0 0 0 4px rgba(0,224,138,.14),0 0 14px rgba(0,224,138,.9)}
  50%{box-shadow:0 0 0 8px rgba(0,224,138,.05),0 0 20px rgba(0,224,138,.55)}
}
@keyframes fade-in{from{opacity:0}to{opacity:1}}

/* ---------- 5. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:16px;top:-80px;
  z-index:200;
  padding:10px 18px;
  background:var(--green);
  color:#04160F;
  font-weight:700;
  text-decoration:none;
  border-radius:var(--radius);
  transition:top .18s ease;
}
.skip-link:focus{top:12px}

/* ---------- 6. 页头：顶部框架条 + 左侧索引栏 ---------- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:80}

.frame-top{
  position:relative;
  z-index:75;
  height:var(--top-h);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:0 clamp(14px,2.4vw,30px);
  background:linear-gradient(180deg,#0E2135 0%,#0A1726 100%);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(0,224,138,.10),0 18px 40px -30px #000;
}
.frame-top::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(0,224,138,.55),rgba(255,165,48,.4),transparent);
}

.brand-lockup{display:flex;align-items:center;min-width:0}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:0}
.brand-mark{
  position:relative;
  flex:0 0 auto;
  width:32px;height:32px;
  border:1px solid var(--line);
  background:linear-gradient(135deg,rgba(0,224,138,.20),rgba(16,38,58,.2) 60%,transparent);
}
.brand-mark::before,
.brand-mark::after{
  content:"";position:absolute;width:7px;height:7px;border:1px solid rgba(201,210,218,.5);
}
.brand-mark::before{top:3px;right:3px;border-left:0;border-bottom:0}
.brand-mark::after{bottom:3px;left:3px;border-right:0;border-top:0}
.brand-dot{
  position:absolute;inset:0;margin:auto;
  width:8px;height:8px;border-radius:50%;
  background:var(--green);
  animation:pulse-dot 3s ease-in-out infinite;
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{
  font-size:17px;font-weight:900;letter-spacing:-.01em;
  color:var(--paper);line-height:1.25;white-space:nowrap;
}
.brand-tag{
  font-size:11.5px;letter-spacing:.08em;color:var(--graphite);
  line-height:1.5;white-space:nowrap;
}

.frame-meta{display:flex;align-items:center;gap:clamp(10px,1.6vw,22px);min-width:0}
.frame-meta .coord{color:var(--graphite)}
.version-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 10px;
  border:1px solid rgba(255,165,48,.45);
  background:rgba(255,165,48,.08);
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.14em;
  color:var(--amber);
  white-space:nowrap;
}
.version-label{color:rgba(255,165,48,.65);font-size:10px}
.version-num{font-weight:700}

.quick-actions{display:flex;align-items:center;gap:10px}

.nav-toggle{
  display:none;
  align-items:center;gap:9px;
  padding:9px 12px;
  border:1px solid var(--line);
  color:var(--silver);
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.2em;
  background:rgba(16,38,58,.6);
}
.nav-toggle:hover{border-color:var(--green-text);color:var(--paper)}
.nav-toggle-bars{position:relative;width:16px;height:12px;flex:0 0 auto}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:1.5px;
  background:currentColor;
  transition:transform .2s ease,top .2s ease;
}
.nav-toggle-bars::before{top:2px}
.nav-toggle-bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:5px;transform:rotate(-45deg)}

.nav-scrim{
  position:fixed;inset:0;z-index:65;
  background:rgba(4,10,18,.68);
  animation:fade-in .18s ease both;
}

.site-rail{
  position:fixed;
  top:var(--top-h);left:0;bottom:0;
  z-index:70;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  padding:22px 0 26px;
  overflow-y:auto;
  background:linear-gradient(180deg,rgba(16,38,58,.94),rgba(10,23,38,.98));
  border-right:1px solid var(--line);
}
.site-rail::before{
  content:"";position:absolute;top:0;bottom:0;right:-1px;width:1px;
  background:linear-gradient(180deg,rgba(0,224,138,.5),transparent 40%,transparent 70%,rgba(201,210,218,.25));
}
.rail-list{display:flex;flex-direction:column;width:100%}
.rail-item{border-bottom:1px solid rgba(27,58,84,.7)}
.rail-link{
  display:flex;
  flex-direction:column;
  gap:5px;
  padding:13px 14px 13px 16px;
  text-decoration:none;
  color:var(--silver);
  border-left:2px solid transparent;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.rail-link:hover{
  color:var(--paper);
  background:rgba(0,224,138,.07);
  border-left-color:var(--green-text);
}
.rail-link[aria-current="page"]{
  color:var(--green);
  border-left-color:var(--green);
  background:linear-gradient(90deg,rgba(0,224,138,.16),transparent 85%);
}
.rail-link[aria-current="page"] .rail-num{color:var(--green)}
.rail-num{
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.18em;
  color:var(--graphite);
}
.rail-text{font-size:14px;line-height:1.4;letter-spacing:.02em}
.rail-label{
  margin:auto auto 0;
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.3em;
  color:rgba(140,151,163,.6);
  padding:16px 0 6px;
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  margin-top:clamp(56px,9vw,120px);
  position:relative;
  background:linear-gradient(180deg,#0C1E30 0%,#08131F 100%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(0,224,138,.6),rgba(255,165,48,.35),transparent);
}
.footer-inner{
  max-width:calc(var(--shell-max) + 40px);
  margin:0 auto;
  padding:clamp(40px,6vw,76px) clamp(20px,4vw,48px) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.1fr 1.5fr;
  gap:clamp(24px,3.4vw,52px);
}
.footer-brand .brand{margin-bottom:16px}
.footer-lede{font-size:14.5px;color:var(--silver);max-width:34ch;margin-bottom:8px}
.footer-note{font-size:13px;color:var(--graphite);max-width:34ch}

.footer-col{min-width:0}
.footer-title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--green-text);
  font-weight:400;
  margin:0 0 16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-list li{font-size:14.5px;color:var(--silver);padding:5px 0;line-height:1.7}
.footer-list--plain li{color:var(--graphite)}
.footer-list a{
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-list a:hover{color:var(--green);border-bottom-color:rgba(0,224,138,.55)}

.footer-contact-item{
  display:flex;
  align-items:flex-start;
  gap:10px;
  justify-content:space-between;
}
.footer-contact-text{
  font-size:14px;
  color:var(--silver);
  word-break:break-word;
  line-height:1.7;
  letter-spacing:.02em;
}
.copy-btn{
  flex:0 0 auto;
  padding:4px 9px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--graphite);
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.copy-btn:hover{color:var(--green);border-color:var(--green-text);background:rgba(0,224,138,.08)}
.copy-btn.is-copied{color:var(--amber);border-color:rgba(255,165,48,.6);background:rgba(255,165,48,.1)}

.footer-bar{
  margin-top:clamp(32px,5vw,58px);
  padding:20px 0 30px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 26px;
  font-size:13px;
  color:var(--graphite);
}
.footer-meta{font-size:13px;color:var(--graphite)}
.footer-bar-note{
  font-size:13px;
  color:var(--amber);
  letter-spacing:.02em;
}

/* ---------- 8. 容器 / 分区 / 网格 ---------- */
.shell{
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding:0 clamp(20px,4vw,56px);
}
.section{padding:clamp(48px,7vw,96px) 0}
.section--tint{
  background:linear-gradient(180deg,rgba(16,38,58,.88),rgba(16,38,58,.42));
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.section-head{margin-bottom:clamp(24px,3vw,44px);max-width:70ch}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.col-2{grid-column:span 2}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-10{grid-column:span 10}
.col-12{grid-column:span 12}
.start-2{grid-column-start:2}
.start-3{grid-column-start:3}
.start-4{grid-column-start:4}
.start-7{grid-column-start:7}

.rule{
  display:flex;
  align-items:center;
  gap:14px;
  margin:clamp(24px,3vw,40px) 0;
}
.rule::before,.rule::after{content:"";height:1px;background:var(--line);flex:1}
.rule span{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.26em;
  color:var(--graphite);
  white-space:nowrap;
}

.strip{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  border:1px solid var(--line);
  background:rgba(16,38,58,.55);
}
.strip__cell{
  padding:18px 20px;
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  min-width:0;
}
.strip__cell:last-child{border-right:0}

/* ---------- 9. 面包屑 / 按钮 / 标签 ---------- */
.breadcrumbs{
  padding:20px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--graphite);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:0}
.breadcrumbs li{display:flex;align-items:center}
.breadcrumbs li+li::before{content:"/";margin:0 10px;color:var(--line)}
.breadcrumbs a{text-decoration:none;color:var(--silver)}
.breadcrumbs a:hover{color:var(--green)}
.breadcrumbs [aria-current="page"]{color:var(--green-text)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 16px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-size:13px;
  letter-spacing:.04em;
  text-decoration:none;
  white-space:nowrap;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:active{transform:translateY(1px)}
.btn-soft{
  background:var(--green);
  color:#04160F;
  font-weight:700;
  box-shadow:0 8px 20px -12px rgba(0,224,138,.9);
}
.btn-soft:hover{background:#25F5A2}
.btn-line{border-color:var(--line);color:var(--silver)}
.btn-line:hover{border-color:var(--green-text);color:var(--paper);background:rgba(0,224,138,.06)}
.btn-ghost{color:var(--green-text);padding:10px 6px}
.btn-ghost:hover{color:var(--green)}
.btn-amber{
  border-color:rgba(255,165,48,.55);
  background:rgba(255,165,48,.1);
  color:var(--amber);
}
.btn-amber:hover{background:rgba(255,165,48,.18)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 10px;
  border:1px solid var(--line);
  background:rgba(16,38,58,.6);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--silver);
}
.tag--green{border-color:rgba(0,224,138,.45);color:var(--green)}
.tag--amber{border-color:rgba(255,165,48,.5);color:var(--amber)}
.tag--paper{background:var(--paper);color:var(--ink-900);border-color:var(--paper);font-weight:700}

.paper-slip{
  position:relative;
  background:var(--paper);
  color:var(--ink-900);
  padding:24px 26px;
  box-shadow:10px 10px 0 -3px rgba(27,58,84,.9),0 24px 50px -34px #000;
}
.paper-slip::before{
  content:"";
  position:absolute;
  inset:7px;
  border:1px dashed rgba(10,23,38,.22);
  pointer-events:none;
}
.paper-slip .h3,.paper-slip .h2{color:var(--ink-900)}

/* ---------- 10. 分段切换 ---------- */
.tabs{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  border-bottom:1px solid var(--line);
}
.tab{
  padding:12px 16px;
  margin-bottom:-1px;
  border-bottom:2px solid transparent;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--graphite);
  transition:color .18s ease,background .18s ease,border-color .18s ease;
}
.tab:hover{color:var(--silver);background:rgba(16,38,58,.6)}
.tab[aria-selected="true"]{
  color:var(--green);
  border-bottom-color:var(--green);
  background:linear-gradient(180deg,rgba(0,224,138,.12),transparent);
}
.tab-panel{position:relative;padding-top:26px}
.tab-panel.is-entering{animation:fade-in .18s ease both}

/* ---------- 11. 图片容器（页面阶段放入 <img>） ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(16,38,58,.95),rgba(10,23,38,.95));
}
.media-frame > img{
  width:100%;
  height:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  display:block;
  filter:saturate(.92) contrast(1.04);
}
.media-frame--wide > img{aspect-ratio:21/9}
.media-frame--square > img{aspect-ratio:1/1}
.media-frame--tall > img{aspect-ratio:4/5}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(180deg,rgba(0,224,138,.16),transparent 34%),
    linear-gradient(0deg,rgba(10,23,38,.88),transparent 52%);
}
.media-frame__caption{
  position:relative;
  z-index:1;
  padding:11px 14px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--graphite);
  background:rgba(10,23,38,.9);
}
.media-frame__tag{
  position:absolute;
  z-index:2;
  top:12px;left:12px;
  padding:4px 9px;
  background:rgba(10,23,38,.82);
  border:1px solid rgba(0,224,138,.45);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--green);
  text-transform:uppercase;
}

/* ---------- 12. 滚动显现 ---------- */
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .55s ease,transform .55s ease;
}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 13. 主内容锚点 ---------- */
#main-content{scroll-margin-top:calc(var(--top-h) + 20px)}
#main-content:focus{outline:none}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1180px){
  :root{--rail-w:98px}
  .rail-text{font-size:13px}
  .footer-grid{grid-template-columns:1.4fr 1fr 1.2fr;row-gap:36px}
  .footer-col:last-child{grid-column:span 2}
}

@media (max-width:900px){
  :root{--rail-w:0px;--top-h:58px}
  body{font-size:16px}
  .nav-toggle{display:inline-flex}
  .frame-meta .coord{display:none}

  .site-rail{
    top:0;bottom:0;
    width:min(84vw,330px);
    padding:calc(var(--top-h) + 20px) 0 28px;
    transform:translateX(-104%);
    transition:transform .22s ease;
    box-shadow:26px 0 70px -34px #000;
    z-index:70;
  }
  .site-rail[data-open]{transform:translateX(0)}
  .rail-list{padding-top:4px}
  .rail-link{
    flex-direction:row;
    align-items:baseline;
    gap:14px;
    padding:15px 22px;
  }
  .rail-num{font-size:11px}
  .rail-text{font-size:15.5px}
  .rail-label{
    order:-1;
    margin:0 0 14px;
    padding:0 22px;
    writing-mode:horizontal-tb;
    transform:none;
    font-size:10.5px;
  }

  .grid-12 > *{grid-column:span 12}
  .grid-12{gap:20px}

  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-col:last-child{grid-column:span 2}
  .footer-bar{flex-direction:column;align-items:flex-start}
}

@media (max-width:720px){
  .quick-actions .btn-line{display:none}
  .brand-tag{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-col:last-child{grid-column:auto}
  .strip{grid-template-columns:1fr}
  .strip__cell{border-right:0}
}

@media (max-width:420px){
  .brand-name{font-size:15.5px}
  .version-chip{padding:4px 8px;font-size:11px}
  .btn{padding:9px 12px;font-size:12.5px}
}

/* ---------- 15. 降低动效 ---------- */
@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-ready [data-reveal]{opacity:1;transform:none}
  .brand-dot{box-shadow:0 0 0 4px rgba(0,224,138,.14)}
  .path::after{opacity:1}
}