/* =========================================================
   开云押注入口 — /assets/site.css
   共享外壳：tokens / reset / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================= */

/* ---------- 1. tokens ---------- */
:root{
  --ink-950:#050d0b;
  --ink-900:#07120f;
  --ink-850:#0a1714;
  --ink-800:#0d1d19;
  --ink-700:#122722;

  --line-1:rgba(120,206,192,.16);
  --line-2:rgba(120,206,192,.30);
  --line-3:rgba(120,206,192,.50);

  --cyan:#3ef0d3;
  --cyan-600:#22c2ab;
  --cyan-900:rgba(62,240,211,.10);

  --amber:#f2b544;
  --amber-700:#b8802a;
  --amber-900:rgba(242,181,68,.12);

  --paper:#edf3ef;
  --paper-2:#c0cbc4;
  --paper-3:#86948c;

  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --wrap:1200px;
  --pad:clamp(18px,4vw,44px);
  --t-fast:.22s;
  --t-slow:.55s;
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:var(--ink-950)}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,hr{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0}

/* ---------- 3. base / 中文排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-950);
  background-image:
    linear-gradient(rgba(62,240,211,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(62,240,211,.035) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{color:var(--paper);font-weight:800;line-height:1.22;letter-spacing:-.005em}
h1{font-size:clamp(30px,4.6vw,52px)}
h2{font-size:clamp(23px,3.1vw,34px)}
h3{font-size:clamp(18px,2.1vw,22px)}
h4{font-size:17px}
strong{font-weight:800;color:var(--paper)}
small{font-size:13px;color:var(--paper-3)}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

#main-content{scroll-margin-top:84px}

/* ---------- 4. 工具与排版组件 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad)}
.wrap--narrow{max-width:880px}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}

.rule{height:1px;background:var(--line-1);width:100%}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--cyan);flex:0 0 auto}

.lede{font-size:clamp(15px,1.55vw,18px);line-height:1.85;color:var(--paper-2);max-width:70ch}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:400;
  padding:10px 16px;
  background:var(--cyan);color:#04140f;
  font-size:14px;font-weight:800;letter-spacing:.08em;
  transform:translateY(-180%);
  transition:transform var(--t-fast) ease;
}
.skip-link:focus{transform:none}

/* ---------- 5. 头部 ---------- */
.site-head{position:relative;z-index:120;background:linear-gradient(180deg,rgba(7,18,15,.98),rgba(5,13,11,.94))}

.head-rail{
  border-bottom:1px solid var(--line-1);
  background:linear-gradient(90deg,rgba(62,240,211,.075),rgba(7,18,15,0) 46%,rgba(242,181,68,.095));
}
.head-rail__inner{
  display:flex;align-items:center;gap:clamp(14px,3vw,40px);
  min-height:72px;padding-block:11px;
}
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__mark{
  display:grid;place-items:center;
  width:44px;height:44px;
  border:1px solid var(--line-3);
  background:var(--cyan-900);
  color:var(--cyan);font-size:13px;font-weight:700;letter-spacing:.14em;
}
.brand__stack{display:flex;flex-direction:column;line-height:1.18}
.brand__name{font-size:17px;font-weight:800;letter-spacing:.05em;color:var(--paper)}
.brand__sub{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--paper-3)}

.head-rail__note{
  flex:1 1 auto;min-width:0;text-align:center;
  font-size:12.5px;letter-spacing:.06em;color:var(--paper-3);
}
.head-rail__meta{display:flex;align-items:center;gap:12px;flex:0 0 auto}

.meta-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 12px;
  border:1px solid rgba(242,181,68,.34);
  background:var(--amber-900);
  color:var(--amber);
  font-size:11.5px;font-weight:700;letter-spacing:.12em;
  white-space:nowrap;
}

.head-nav{
  position:sticky;top:0;z-index:130;
  background:rgba(7,18,15,.94);
  border-bottom:1px solid var(--line-2);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.head-nav__inner{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:14px;
  min-height:58px;
}
.head-nav__tag{display:none;font-size:11px;letter-spacing:.2em;color:var(--paper-3)}

.nav-list{display:flex;align-items:stretch;flex-wrap:wrap;gap:clamp(2px,1vw,10px)}
.nav-list a{
  position:relative;display:block;
  padding:9px 12px;
  border:1px solid transparent;
  font-size:15px;font-weight:600;letter-spacing:.045em;color:var(--paper-2);
  transition:color var(--t-fast),border-color var(--t-fast),background var(--t-fast);
}
.nav-list a::before{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:1px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left center;
  transition:transform var(--t-fast) ease;
}
.nav-list a:hover{color:var(--paper);border-color:var(--line-1);background:rgba(62,240,211,.05)}
.nav-list a:hover::before{transform:scaleX(1)}
.nav-list a[aria-current="page"]{
  color:var(--cyan);
  border-color:var(--line-2);
  background:var(--cyan-900);
}
.nav-list a[aria-current="page"]::before{transform:scaleX(1);background:var(--amber)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:10px 14px;
  border:1px solid var(--line-2);
  color:var(--paper);
  font-size:12px;font-weight:700;letter-spacing:.18em;
  transition:color var(--t-fast),border-color var(--t-fast);
}
.nav-toggle:hover{color:var(--cyan);border-color:var(--line-3)}
.nav-toggle__bars{position:relative;display:block;width:18px;height:12px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:100%;height:2px;background:var(--cyan);
  transition:transform var(--t-fast),top var(--t-fast);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:10px}
[data-nav][data-open] .nav-toggle__bars::before{top:5px;transform:rotate(45deg)}
[data-nav][data-open] .nav-toggle__bars::after{top:5px;transform:rotate(-45deg)}

/* ---------- 6. 页脚 ---------- */
.site-foot{
  margin-top:clamp(40px,7vw,90px);
  border-top:1px solid var(--line-2);
  background:linear-gradient(180deg,#08130f,#040a08);
}
.foot-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) repeat(2,minmax(0,.8fr)) minmax(0,1.15fr);
  gap:clamp(22px,3.4vw,46px);
  padding-block:clamp(38px,5.5vw,68px);
}
.foot-about{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.brand--foot .brand__mark{width:40px;height:40px}
.foot-about__text{font-size:14.5px;line-height:1.8;color:var(--paper-2);max-width:38ch}

.foot-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;
  letter-spacing:.22em;color:var(--cyan);
}
.foot-col li + li{margin-top:9px}
.foot-col a{
  font-size:14px;color:var(--paper-2);
  border-bottom:1px solid transparent;
  transition:color var(--t-fast),border-color var(--t-fast);
}
.foot-col a:hover{color:var(--paper);border-color:var(--line-3)}

.foot-contact li{font-size:14px;line-height:1.7}
.foot-contact__k{
  display:block;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--paper-3);
}
.foot-contact__v{color:var(--paper);word-break:break-word}
.foot-contact__note{margin-top:14px;font-size:12.5px;line-height:1.75;color:var(--paper-3)}

.foot-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  padding-block:20px;
  border-top:1px solid var(--line-1);
  font-size:12px;letter-spacing:.08em;color:var(--paper-3);
}
.foot-base p{font-family:var(--font-mono)}

/* ---------- 7. 按钮 / 标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:12px 20px;
  border:1px solid var(--line-3);
  background:var(--cyan);color:#04140f;
  font-size:14px;font-weight:800;letter-spacing:.08em;
  transition:transform var(--t-fast),background var(--t-fast),color var(--t-fast),box-shadow var(--t-fast);
}
.btn:hover{transform:translateY(-2px);box-shadow:0 14px 32px -16px rgba(62,240,211,.85)}
.btn--ghost{background:transparent;color:var(--cyan);border-color:var(--line-3)}
.btn--ghost:hover{background:var(--cyan-900);color:var(--cyan);box-shadow:none}
.btn--amber{background:var(--amber);border-color:var(--amber);color:#1a1206}
.btn--amber:hover{box-shadow:0 14px 32px -16px rgba(242,181,68,.8)}
.btn--sm{padding:8px 14px;font-size:13px}

.tag{
  display:inline-flex;align-items:center;gap:7px;
  padding:4px 10px;
  border:1px solid var(--line-2);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--paper-2);
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(62,240,211,.42);background:var(--cyan-900)}
.tag--amber{color:var(--amber);border-color:rgba(242,181,68,.42);background:var(--amber-900)}

/* ---------- 8. 章节 / 网格 / 卡片 ---------- */
.section{padding-block:clamp(44px,7vw,88px);border-top:1px solid var(--line-1)}
.section:first-of-type{border-top:0}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px;margin-bottom:clamp(22px,3.4vw,40px);
}
.section-head__aside{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--paper-3);
}

.grid{display:grid;gap:clamp(16px,2.4vw,26px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,1.35fr) minmax(0,.85fr)}

.card{
  position:relative;
  padding:clamp(18px,2.6vw,28px);
  border:1px solid var(--line-1);
  background:linear-gradient(180deg,rgba(18,39,34,.86),rgba(9,20,17,.92));
  transition:border-color var(--t-fast),transform var(--t-fast);
}
.card:hover{border-color:var(--line-2);transform:translateY(-3px)}
.card--offset{margin-top:clamp(0px,3vw,34px)}
.card__index{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;color:var(--amber)}
.card__title{margin-top:8px;font-size:19px;font-weight:800;letter-spacing:.01em}
.card__text{margin-top:10px;font-size:15px;line-height:1.8;color:var(--paper-2)}

.panel{
  padding:clamp(20px,3vw,34px);
  border:1px solid var(--line-1);
  background:linear-gradient(180deg,rgba(13,29,25,.74),rgba(6,14,12,.86));
}
.panel--cyan{border-color:rgba(62,240,211,.32);background:linear-gradient(180deg,rgba(62,240,211,.08),rgba(6,14,12,.88))}
.panel--amber{border-color:rgba(242,181,68,.32);background:linear-gradient(180deg,rgba(242,181,68,.08),rgba(6,14,12,.88))}

.stat{display:flex;flex-direction:column;gap:4px;padding:14px 16px;border:1px solid var(--line-1);background:rgba(9,20,17,.72)}
.stat__k{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--paper-3)}
.stat__v{font-family:var(--font-mono);font-size:clamp(22px,3vw,28px);font-weight:700;line-height:1.1;color:var(--amber)}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding-block:18px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--paper-3);
}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li + li::before{content:"/";margin-right:10px;color:var(--line-3)}
.breadcrumb a{color:var(--paper-2);transition:color var(--t-fast)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--amber)}

.prose{max-width:74ch;font-size:16.5px;line-height:1.9;color:var(--paper-2)}
.prose > * + *{margin-top:1.1em}
.prose h2{margin-top:2em;font-size:clamp(21px,2.6vw,28px)}
.prose h3{margin-top:1.6em}
.prose ul{list-style:square;padding-left:1.15em}
.prose ol{list-style:decimal;padding-left:1.3em}
.prose li + li{margin-top:.4em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(62,240,211,.4)}
.prose a:hover{border-color:var(--cyan)}
.prose blockquote{
  padding:14px 20px;
  border-left:2px solid var(--amber);
  background:var(--amber-900);
  color:var(--paper);
}

/* ---------- 9. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line-1);
  background-color:var(--ink-800);
  background-image:
    linear-gradient(rgba(62,240,211,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(62,240,211,.06) 1px,transparent 1px);
  background-size:38px 38px,38px 38px;
}
.media-frame img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.88) contrast(1.06) brightness(.94);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(5,13,11,0) 50%,rgba(5,13,11,.78));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__cap{
  position:absolute;left:14px;bottom:12px;z-index:2;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--cyan);
}

/* ---------- 10. 筛选条 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;padding-block:16px}
.filter-btn{
  padding:8px 14px;
  border:1px solid var(--line-1);
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;letter-spacing:.12em;
  color:var(--paper-2);
  transition:color var(--t-fast),border-color var(--t-fast),background var(--t-fast);
}
.filter-btn:hover{color:var(--paper);border-color:var(--line-3)}
.filter-btn[aria-pressed="true"]{color:#04140f;background:var(--cyan);border-color:var(--cyan)}
[data-filter-item][data-filtered="true"]{display:none}

/* ---------- 11. JS 注入组件 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:400;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  pointer-events:none;
}
.to-top{
  position:fixed;right:clamp(14px,2.5vw,30px);bottom:clamp(14px,2.5vw,30px);z-index:350;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;
  border:1px solid var(--line-2);
  background:rgba(7,18,15,.94);
  color:var(--cyan);
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;letter-spacing:.14em;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity var(--t-fast),transform var(--t-fast),visibility var(--t-fast);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}

/* ---------- 12. 滚动显现 ---------- */
.has-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity var(--t-slow) ease,transform var(--t-slow) ease;
}
.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1080px){
  .head-rail__note{display:none}
}

@media (max-width:980px){
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,1fr)}
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-about{grid-column:1 / -1}
}

@media (max-width:900px){
  .head-rail__inner{min-height:64px;gap:16px}
  .head-rail__meta .meta-chip{display:none}
  .head-nav__tag{display:inline-block}
  .nav-toggle{display:inline-flex}
  .head-nav__inner{padding-block:9px;row-gap:0}
  .nav-list{
    display:none;
    width:100%;
    flex-direction:column;gap:0;
    margin-top:8px;
    padding-block:6px;
    border-top:1px solid var(--line-1);
  }
  [data-nav][data-open] .nav-list{display:flex}
  .nav-list li{border-bottom:1px solid var(--line-1)}
  .nav-list li:last-child{border-bottom:0}
  .nav-list a{padding:14px 2px;border:0;font-size:16px}
  .nav-list a:hover{background:transparent}
  .nav-list a::before{left:2px;right:auto;width:22px;bottom:12px}
  .nav-list a[aria-current="page"]{background:transparent}
}

@media (max-width:640px){
  .grid-2,.grid-3{grid-template-columns:minmax(0,1fr)}
  .card--offset{margin-top:0}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:30px}
  .foot-base{flex-direction:column;align-items:flex-start}
}

@media (max-width:480px){
  .brand__mark{width:38px;height:38px;font-size:12px}
  .brand__sub{display:none}
  .brand__name{font-size:16px}
}

/* ---------- 14. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .scroll-progress{display:none}
  .btn:hover,.card:hover{transform:none}
}