/* =====================================================================
   KAIYUN主站 · 共享样式表  /assets/site.css
   监控室深墨绿底 / 荧光青索引 / 纸张叠层
   ===================================================================== */

/* ---------- 0. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{list-style:none;margin:0;padding:0;}
img,svg,video{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;padding:0;cursor:pointer;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px;}

/* ---------- 1. 变量 ---------- */
:root{
  --ink-900:#06110E;
  --ink-850:#081714;
  --ink-800:#0B1A16;
  --ink-750:#0E231D;
  --line:#1E3A33;
  --line-2:rgba(30,58,51,.62);
  --cyan:#35FFD0;
  --cyan-soft:#7CF6E0;
  --amber:#FFB020;
  --red:#FF5A46;
  --paper:#F2F5F1;
  --muted:#8FA6A0;
  --stack:#E8E3D6;

  --bar-h:56px;
  --rail-w:238px;
  --wrap:1180px;

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

  --ease:cubic-bezier(.22,.72,.28,1);
  --shadow-panel:0 22px 44px -32px rgba(0,0,0,.95);
  --shadow-stack:7px 7px 0 -1px rgba(232,227,214,.05),0 22px 44px -32px rgba(0,0,0,.95);
}
@media (min-width:1024px){
  :root{--bar-h:60px;--rail-w:246px;}
}

/* ---------- 2. 页面基底 ---------- */
body{
  min-height:100%;
  background-color:var(--ink-900);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.006em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  padding-top:var(--bar-h);
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w);}
}
/* 机房噪点 + 扫描线 + 灯光光斑 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(242,245,241,.018) 0 1px,transparent 1px 4px),
    radial-gradient(900px 520px at 12% -6%,rgba(53,255,208,.075),transparent 66%),
    radial-gradient(760px 520px at 96% 14%,rgba(255,176,32,.05),transparent 68%),
    radial-gradient(900px 700px at 50% 118%,rgba(53,255,208,.05),transparent 70%);
}
body > *{position:relative;z-index:1;}

/* ---------- 3. 排版基线 ---------- */
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.02em;
  color:var(--paper);
}
h1{font-size:clamp(30px,5vw,58px);}
h2{font-size:clamp(22px,3vw,34px);}
h3{font-size:clamp(17px,1.9vw,22px);}
h4{font-size:clamp(15px,1.4vw,17px);letter-spacing:0;}
p{overflow-wrap:anywhere;}
.lead{font-size:clamp(17px,1.5vw,19px);line-height:1.85;color:#CFDCD7;}
.prose{max-width:38em;}
.prose p + p{margin-top:.9em;}
.text-muted{color:var(--muted);}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}
.rule{height:1px;background:var(--line);border:0;margin:0;}
.bleed{max-width:none !important;}

/* ---------- 4. 主内容容器 ---------- */
#main-content{
  display:block;
  padding:clamp(26px,4vw,54px) clamp(16px,4vw,48px) clamp(42px,6vw,86px);
}
#main-content > *{max-width:var(--wrap);margin-inline:auto;}
@media (min-width:1024px){
  #main-content{padding-inline:clamp(26px,4vw,60px);}
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:8px;left:8px;
  z-index:200;
  padding:10px 16px;
  background:var(--cyan);
  color:var(--ink-900);
  font-family:var(--font-display);
  font-size:13px;
  font-weight:800;
  letter-spacing:.04em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ---------- 6. 头部：状态横条 ---------- */
.site-header{position:relative;z-index:60;}
.status-bar{
  position:fixed;
  top:0;left:0;right:0;
  height:var(--bar-h);
  z-index:70;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,22px);
  padding-inline:clamp(12px,2.2vw,26px);
  background:rgba(6,17,14,.94);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.status-bar::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:1px;
  background:linear-gradient(90deg,var(--cyan) 0%,rgba(53,255,208,.14) 34%,transparent 72%);
  opacity:.7;
  pointer-events:none;
}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.brand-glyph{
  display:grid;
  grid-template-columns:repeat(3,4px);
  align-items:end;
  gap:3px;
  height:20px;
}
.brand-glyph i{display:block;width:4px;border-radius:1px;background:var(--cyan);}
.brand-glyph i:nth-child(1){height:20px;}
.brand-glyph i:nth-child(2){height:11px;background:var(--cyan-soft);}
.brand-glyph i:nth-child(3){height:16px;background:var(--amber);}
.brand-text{display:flex;align-items:baseline;gap:7px;line-height:1;}
.brand-text strong{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--paper);
}
.brand-text em{
  font-style:normal;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
}
.status-track{
  display:flex;
  align-items:center;
  gap:8px;
  flex:1 1 auto;
  min-width:0;
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.status-dot{
  flex:0 0 auto;
  width:7px;height:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,255,208,.15);
}
.status-label{white-space:nowrap;}
.status-value{color:var(--paper);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.version-badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin:0;
  padding:4px 10px;
  border:1px solid rgba(255,176,32,.36);
  border-radius:2px;
  background:rgba(255,176,32,.07);
  color:var(--amber);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  white-space:nowrap;
}
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:8px 12px;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(11,26,22,.86);
  color:var(--paper);
  font-family:var(--font-display);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle-bars{display:grid;gap:3px;}
.nav-toggle-bars i{display:block;width:14px;height:1.5px;background:currentColor;}
.nav-toggle-text{white-space:nowrap;}
@media (min-width:1024px){.nav-toggle{display:none;}}
@media (max-width:980px){.version-badge{display:none;}}
@media (max-width:640px){
  .status-track{display:none;}
  .brand-text em{display:none;}
}

/* ---------- 7. 头部：侧边索引轨道 ---------- */
.rail{
  position:fixed;
  top:var(--bar-h);
  left:0;
  bottom:0;
  width:min(82vw,300px);
  z-index:55;
  display:flex;
  flex-direction:column;
  gap:16px;
  padding:26px 16px 22px;
  background:linear-gradient(180deg,#081714 0%,var(--ink-900) 100%);
  border-right:1px solid var(--line);
  overflow-y:auto;
  overscroll-behavior:contain;
  transform:translateX(-101%);
  visibility:hidden;
  transition:transform .28s var(--ease),visibility .28s var(--ease);
}
.rail[data-open]{transform:translateX(0);visibility:visible;}
@media (min-width:1024px){
  .rail{width:var(--rail-w);transform:none;visibility:visible;}
}
.rail-head{
  margin:0;
  padding-left:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--muted);
}
.rail-list{display:flex;flex-direction:column;gap:2px;}
.rail-link{
  display:grid;
  grid-template-columns:32px minmax(0,1fr);
  align-items:center;
  gap:8px;
  padding:11px 12px 11px 9px;
  border-radius:3px;
  border-left:3px solid transparent;
  color:var(--muted);
  font-size:15px;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.rail-link:hover{color:var(--paper);background:rgba(53,255,208,.06);border-left-color:var(--cyan-soft);}
.rail-link[aria-current="page"]{
  color:var(--paper);
  font-weight:700;
  border-left-color:var(--cyan);
  background:linear-gradient(90deg,rgba(53,255,208,.15),transparent 88%);
}
.rail-num{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--muted);}
.rail-link[aria-current="page"] .rail-num{color:var(--cyan);}
.rail-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.rail-foot{
  margin-top:auto;
  padding:16px 12px 4px;
  border-top:1px dashed var(--line);
}
.rail-foot-label{
  margin:0 0 8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
}
.rail-foot-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--cyan);
  font-family:var(--font-display);
  font-size:14px;
  font-weight:700;
  border-bottom:1px solid rgba(53,255,208,.4);
  padding-bottom:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.rail-foot-link:hover{color:var(--cyan-soft);border-color:var(--cyan-soft);}
.nav-scrim{
  position:fixed;
  inset:var(--bar-h) 0 0 0;
  z-index:54;
  background:rgba(6,17,14,.74);
  opacity:0;
  visibility:hidden;
  transition:opacity .22s var(--ease),visibility .22s var(--ease);
}
.site-header:has(.rail[data-open]) .nav-scrim{opacity:1;visibility:visible;}
@media (min-width:1024px){.nav-scrim{display:none;}}

/* ---------- 8. 顶部阅读进度 ---------- */
.scroll-meter{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.scroll-meter span{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-soft));
  transition:width .12s linear;
}

/* ---------- 9. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(11,26,22,.86);
  color:var(--paper);
  font-family:var(--font-display);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  transition:background .22s var(--ease),border-color .22s var(--ease),color .22s var(--ease),transform .22s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-1px);}
.btn--primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink-900);
  box-shadow:0 12px 30px -18px rgba(53,255,208,.9);
}
.btn--primary:hover{background:var(--cyan-soft);border-color:var(--cyan-soft);color:var(--ink-900);}
.btn--ghost{background:transparent;}
.btn--sm{padding:7px 14px;font-size:12.5px;}
.btn-back{
  flex:0 0 auto;
  padding:7px 13px;
  font-size:12.5px;
  letter-spacing:.06em;
  white-space:nowrap;
  background:transparent;
}

/* ---------- 10. 标签 / 状态 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(11,26,22,.7);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(53,255,208,.4);background:rgba(53,255,208,.08);}
.tag--amber{color:var(--amber);border-color:rgba(255,176,32,.42);background:rgba(255,176,32,.08);}
.tag--alert{color:var(--red);border-color:rgba(255,90,70,.45);background:rgba(255,90,70,.09);}
.tag-dot{flex:0 0 auto;width:6px;height:6px;border-radius:50%;background:currentColor;}

/* ---------- 11. 面板与数据 ---------- */
.panel{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  border:1px solid var(--line);
  border-radius:3px;
  background:linear-gradient(180deg,var(--ink-800) 0%,#091512 100%);
  box-shadow:var(--shadow-panel);
}
.panel--stack{box-shadow:var(--shadow-stack);}
.panel--accent{border-top:2px solid var(--cyan);}
.panel-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:14px;
  padding-bottom:12px;
  margin-bottom:16px;
  border-bottom:1px solid var(--line);
}
.panel-title{
  font-family:var(--font-display);
  font-size:clamp(16px,1.6vw,19px);
  font-weight:800;
  letter-spacing:-.01em;
}
.panel-note{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
  white-space:nowrap;
}
.stat{display:flex;flex-direction:column;gap:4px;}
.stat-value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3.6vw,40px);
  font-weight:700;
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--cyan);
}
.stat-value--amber{color:var(--amber);}
.stat-value--paper{color:var(--paper);}
.stat-label{font-size:12px;letter-spacing:.12em;color:var(--muted);}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin-bottom:clamp(18px,2.4vw,28px);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.breadcrumb li{display:flex;align-items:center;gap:8px;}
.breadcrumb li + li::before{content:"／";color:var(--line);}
.breadcrumb a{transition:color .2s var(--ease);}
.breadcrumb a:hover{color:var(--cyan);}
.breadcrumb [aria-current="page"]{color:var(--paper);}

/* ---------- 13. 章节结构 ---------- */
.section{padding-block:clamp(34px,5vw,68px);}
.section--wide{max-width:var(--wrap);margin-inline:auto;}
.section--narrow{max-width:720px;}
.section-head{margin-bottom:clamp(18px,2.6vw,32px);}
.eyebrow{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.2em;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan);flex:0 0 auto;}

/* ---------- 14. Bento 网格 ---------- */
.bento{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(12px,1.6vw,20px);
}
.bento > *{grid-column:1 / -1;}
@media (min-width:760px){
  .bento > .cell-3{grid-column:span 3;}
  .bento > .cell-4{grid-column:span 4;}
  .bento > .cell-5{grid-column:span 5;}
  .bento > .cell-6{grid-column:span 6;}
  .bento > .cell-7{grid-column:span 7;}
  .bento > .cell-8{grid-column:span 8;}
  .bento > .cell-9{grid-column:span 9;}
  .bento > .cell-12{grid-column:span 12;}
  .bento > .cell-lift{margin-top:calc(-1 * clamp(18px,3vw,42px));position:relative;z-index:2;}
}

/* ---------- 15. 图片容器（页面阶段放占位图） ---------- */
.figure{
  position:relative;
  margin:0;
  border:1px solid var(--line);
  border-radius:3px;
  background:var(--ink-800);
  overflow:hidden;
}
.figure::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    repeating-linear-gradient(0deg,rgba(6,17,14,.34) 0 1px,transparent 1px 3px),
    radial-gradient(120% 60% at 20% 0%,rgba(53,255,208,.1),transparent 62%);
  mix-blend-mode:screen;
}
.figure img{width:100%;height:100%;object-fit:cover;}
.figure:empty,
.figure--placeholder{
  background-image:
    repeating-linear-gradient(135deg,rgba(30,58,51,.55) 0 1px,transparent 1px 11px),
    linear-gradient(180deg,var(--ink-800) 0%,var(--ink-900) 100%);
}
.figure--16x9{aspect-ratio:16 / 9;}
.figure--4x3{aspect-ratio:4 / 3;}
.figure--3x2{aspect-ratio:3 / 2;}
.figure--1x1{aspect-ratio:1 / 1;}
.figure--3x4{aspect-ratio:3 / 4;}
.figure-cap{
  position:absolute;
  left:0;bottom:0;
  max-width:100%;
  padding:7px 12px;
  background:rgba(6,17,14,.86);
  border-top:1px solid var(--line);
  border-right:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--muted);
  z-index:2;
}

/* ---------- 16. 通用链接 ---------- */
.link-quiet{
  color:var(--muted);
  font-size:12.5px;
  letter-spacing:.05em;
  border-bottom:1px dashed var(--line-2);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.link-quiet:hover{color:var(--cyan);border-color:var(--cyan);}

/* ---------- 17. 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:1;
  border-top:1px solid var(--line);
  background:
    radial-gradient(1100px 340px at 8% -12%,rgba(53,255,208,.07),transparent 64%),
    linear-gradient(180deg,var(--ink-850) 0%,var(--ink-900) 100%);
  padding:clamp(38px,6vw,72px) clamp(16px,4vw,48px) clamp(20px,3vw,32px);
}
.footer-grid{
  max-width:var(--wrap);
  margin-inline:auto;
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(14px,1.8vw,20px);
}
@media (min-width:700px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (min-width:1100px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;}
}
.paper-card{
  position:relative;
  padding:clamp(18px,2.2vw,24px);
  border:1px solid var(--line);
  border-radius:3px;
  background:linear-gradient(180deg,#10231D 0%,var(--ink-800) 100%);
  box-shadow:var(--shadow-stack);
}
.paper-card::before{
  content:"";
  position:absolute;
  top:-1px;left:-1px;
  width:46px;height:3px;
  background:var(--cyan);
}
.paper-card--service::before{background:var(--amber);}
.paper-card--version::before{background:var(--cyan-soft);}
.paper-card--legal::before{background:var(--stack);}
.paper-title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px dashed var(--line);
  font-family:var(--font-display);
  font-size:13.5px;
  font-weight:800;
  letter-spacing:.14em;
  color:var(--paper);
}
.paper-links{display:flex;flex-direction:column;gap:2px;}
.paper-link{
  display:inline-block;
  padding:4px 0;
  color:var(--muted);
  font-size:14.5px;
  transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.paper-link:hover{color:var(--cyan);padding-left:5px;}
.contact-list{display:flex;flex-direction:column;gap:10px;}
.contact-row{display:flex;flex-direction:column;gap:2px;}
.contact-key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
}
.contact-val{font-size:14px;line-height:1.65;color:var(--paper);overflow-wrap:anywhere;}
.footer-note{
  margin-top:12px;
  font-size:12.5px;
  line-height:1.75;
  color:var(--muted);
}
.footer-base{
  max-width:var(--wrap);
  margin:clamp(26px,4vw,44px) auto 0;
  padding-top:18px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 22px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.05em;
  color:var(--muted);
}
.footer-base-brand{margin:0;color:var(--paper);}
.footer-base-links{display:flex;flex-wrap:wrap;gap:6px 18px;}
.footer-base-meta{margin:0;line-height:1.7;overflow-wrap:anywhere;}

/* ---------- 18. 滚动显现 ---------- */
[data-reveal]{opacity:1;transform:none;}
html.has-js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
html.has-js [data-reveal].is-in{opacity:1;transform:none;}

/* ---------- 19. 响应式与动效降级 ---------- */
@media (max-width:480px){
  body{font-size:16px;}
  .btn{padding:10px 16px;}
  .paper-card::before{width:34px;}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html.has-js [data-reveal]{opacity:1 !important;transform:none !important;}
  .skip-link{transition:none;}
  .rail{transition:none;}
  .scroll-meter span{transition:none;}
}