:root{
  --red:#D7263D;
  --red-deep:#A2122A;
  --cyan:#2FD8C6;
  --cyan-soft:#C9F5EF;
  --orange:#F08A24;
  --orange-soft:#FDEBD6;
  --ink:#101418;
  --night:#0E1726;
  --charcoal:#2A323A;
  --gray:#6B7683;
  --paper:#F2F4F6;
  --white:#FBFCFD;

  --rule:rgba(16,20,24,.14);
  --rule-soft:rgba(16,20,24,.07);
  --on-dark:rgba(251,252,253,.78);
  --on-dark-dim:rgba(251,252,253,.48);
  --hair-dark:rgba(251,252,253,.13);

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

  --rail-w:248px;
  --header-h:64px;
  --content-max:1120px;

  --cut:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%);
  --cut-sm:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
  --ease:cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{box-sizing:border-box;}

html{-webkit-text-size-adjust:100%;}
html.nav-open{overflow:hidden;}

body{
  margin:0;
  padding-top:var(--header-h);
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

@media (min-width:1000px){
  body{padding-left:var(--rail-w);}
}

img,svg,picture{max-width:100%;}
img{height:auto;}

h1,.h1,h2,.h2,h3,.h3,h4,.h4{
  margin:0 0 .5em;
  font-family:var(--font-display);
  color:var(--ink);
  text-wrap:balance;
}
h1,.h1{font-weight:900;font-size:clamp(34px,5.2vw,64px);line-height:1.08;letter-spacing:-.03em;}
h2,.h2{font-weight:900;font-size:clamp(26px,3.2vw,34px);line-height:1.15;letter-spacing:-.02em;}
h3,.h3{font-weight:700;font-size:20px;line-height:1.35;letter-spacing:-.01em;}
h4,.h4{font-weight:700;font-size:17px;line-height:1.45;letter-spacing:-.005em;}

p{margin:0 0 1.2em;}
p:last-child{margin-bottom:0;}

a{color:var(--red);text-decoration:none;}
a:hover{color:var(--red-deep);}

strong,b{font-weight:700;}
small{font-size:12px;}

ul,ol{margin:0 0 1.2em;padding-left:1.4em;}
li{margin:0 0 .35em;}

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

/* ---------- 布局容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--content-max);
  margin-inline:auto;
  padding-inline:20px;
}
@media (min-width:768px){.wrap{padding-inline:32px;}}
@media (min-width:1200px){.wrap{padding-inline:48px 72px;}}

.section{padding-block:56px;}
@media (min-width:768px){.section{padding-block:80px;}}

.stack>*+*{margin-top:16px;}

.grid{display:grid;gap:20px;grid-template-columns:1fr;}
@media (min-width:680px){.grid--2{grid-template-columns:repeat(2,1fr);}}
@media (min-width:900px){
  .grid--3{grid-template-columns:repeat(3,1fr);}
  .grid{gap:28px;}
}

/* ---------- 文本工具 ---------- */
.mono{
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:500;
  letter-spacing:.04em;
}
.lead{
  font-size:17px;
  line-height:1.8;
  color:var(--charcoal);
  max-width:38em;
}
@media (min-width:768px){.lead{font-size:20px;line-height:1.7;}}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.08em;
  color:var(--red);
  text-transform:none;
}
.eyebrow::before{content:"";width:3px;height:12px;background:currentColor;flex:0 0 auto;}

.section-head{display:flex;flex-direction:column;gap:10px;margin-bottom:26px;}
.section-head__num{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:500;
  letter-spacing:.06em;
  color:var(--red);
}
.section-head__num::before{content:"";width:3px;height:14px;background:var(--red);flex:0 0 auto;}
.section-head__num>*{color:var(--charcoal);}

/* ---------- 状态语义 ---------- */
.dot{
  display:inline-block;
  flex:0 0 auto;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--gray);
}
.dot--ok{background:var(--cyan);}
.dot--pending{background:var(--orange);}
.dot--urgent{background:var(--red);}

@media (prefers-reduced-motion:no-preference){
  .dot--ok,.dot--pending{animation:breathe 3s ease-in-out infinite;}
  @keyframes breathe{0%,100%{opacity:1;}50%{opacity:.7;}}
}

.status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  line-height:1.6;
}
.status--ok{background:var(--cyan-soft);color:var(--ink);}
.status--pending{background:var(--orange-soft);color:var(--ink);}
.status--urgent{background:var(--red-deep);color:var(--white);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 22px;
  border:0;
  font-family:var(--font-body);
  font-size:16px;
  font-weight:500;
  line-height:1.2;
  letter-spacing:.01em;
  text-decoration:none;
  cursor:pointer;
  clip-path:var(--cut-sm);
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn--primary{background:var(--red);color:var(--white);}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--red-deep);color:var(--white);}
.btn--ghost{
  background:transparent;
  color:var(--ink);
  box-shadow:inset 0 0 0 1px rgba(16,20,24,.22);
}
.btn--ghost:hover,.btn--ghost:focus-visible{box-shadow:inset 0 0 0 1px var(--red);color:var(--red);}

/* ---------- 卡片 ---------- */
.card{
  padding:22px;
  background:var(--white);
  border:1px solid var(--rule-soft);
}
.card--cut{
  border:0;
  padding:24px;
  clip-path:var(--cut);
}
.card__index{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--gray);
}
.card h3+.card__index,.card__index+h3{margin-top:0;}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 18px;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--gray);
}
.breadcrumb li{margin:0;display:inline-flex;align-items:center;gap:8px;}
.breadcrumb a{color:var(--gray);text-decoration:none;border-bottom:1px solid transparent;}
.breadcrumb a:hover{color:var(--red);border-bottom-color:var(--red);}
.breadcrumb__sep{color:var(--gray);opacity:.6;}

/* ---------- 媒体容器（页面阶段放图） ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/9;
  overflow:hidden;
  background:var(--night);
  clip-path:var(--cut);
}
.media--4x3{aspect-ratio:4/3;}
.media--1x1{aspect-ratio:1/1;}
.media--wide{aspect-ratio:21/9;}
.media>img,.media>picture>img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media__grid::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:radial-gradient(circle,rgba(251,252,253,.16) 1px,transparent 1px);
  background-size:20px 20px;
}
.media__tag{position:absolute;top:14px;left:14px;z-index:2;}
.media__caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--gray);
}

/* ---------- 滚动显现 ---------- */
[data-reveal]{opacity:1;transform:none;}
@media (prefers-reduced-motion:no-preference){
  [data-reveal]{
    opacity:0;
    transform:translateY(12px);
    transition:opacity .32s var(--ease),transform .32s var(--ease);
  }
  [data-reveal].is-in{opacity:1;transform:none;}
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:999;
  padding:10px 16px;
  background:var(--red);
  color:var(--white);
  font-size:14px;
  font-weight:500;
  text-decoration:none;
  transform:translateY(-240%);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0);color:var(--white);}

/* =========================================================
   页头
   ========================================================= */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  height:var(--header-h);
  z-index:60;
  background:var(--night);
  color:var(--white);
  border-bottom:1px solid var(--hair-dark);
}
.site-header__bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  height:var(--header-h);
  padding-inline:16px;
}
@media (min-width:768px){.site-header__bar{padding-inline:24px;}}

.brand{display:flex;align-items:center;min-width:0;}
.brand__link{
  display:inline-flex;
  align-items:center;
  gap:11px;
  color:var(--white);
  text-decoration:none;
}
.brand__link:hover{color:var(--white);}
.brand__mark{
  position:relative;
  flex:0 0 auto;
  width:28px;
  height:28px;
  background:var(--red);
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.brand__mark::after{
  content:"";
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(135deg,transparent 46%,var(--white) 46%,var(--white) 55%,transparent 55%);
}
.brand__text{display:flex;flex-direction:column;min-width:0;}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:17px;
  line-height:1.2;
  letter-spacing:-.01em;
  white-space:nowrap;
}
.brand__domain{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  line-height:1.3;
  letter-spacing:.04em;
  color:var(--on-dark-dim);
  white-space:nowrap;
}

.site-header__tools{display:flex;align-items:center;gap:8px;}

.version-chip{
  padding:3px 8px;
  border:1px solid rgba(47,216,198,.38);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--cyan);
  white-space:nowrap;
}
@media (max-width:639px){
  .version-chip{display:none;}
}

.tool-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid rgba(251,252,253,.24);
  color:var(--white);
  font-size:14px;
  font-weight:500;
  line-height:1.2;
  text-decoration:none;
  clip-path:var(--cut-sm);
  transition:border-color .18s ease,background-color .18s ease;
}
.tool-link:hover,.tool-link:focus-visible{
  color:var(--white);
  border-color:var(--red);
  background:rgba(215,38,61,.16);
}
.tool-link__icon{
  position:relative;
  flex:0 0 auto;
  width:13px;
  height:13px;
}
.tool-link__icon::before{
  content:"";
  position:absolute;
  top:0;left:0;
  width:9px;height:9px;
  border:1.5px solid currentColor;
  border-radius:50%;
}
.tool-link__icon::after{
  content:"";
  position:absolute;
  right:1px;bottom:2px;
  width:6px;height:1.5px;
  background:currentColor;
  transform:rotate(45deg);
  transform-origin:right center;
}
@media (max-width:767px){
  .tool-link{padding:8px 10px;}
  .tool-link__text{display:none;}
}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 11px;
  background:transparent;
  border:1px solid rgba(251,252,253,.24);
  color:var(--white);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  line-height:1.2;
  cursor:pointer;
  clip-path:var(--cut-sm);
}
.nav-toggle:hover{border-color:var(--red);}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:currentColor;
  transition:transform .2s ease;
}
.nav-toggle__bars::before{top:-5px;}
.nav-toggle__bars::after{top:5px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg);}
@media (min-width:1000px){.nav-toggle{display:none;}}

.progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:3px;
  overflow:hidden;
}
.progress__bar{
  display:block;
  width:100%;
  height:100%;
  background:var(--red);
  transform:scaleX(0);
  transform-origin:0 50%;
  will-change:transform;
}

/* ---------- 侧边轨道导航 ---------- */
.site-nav{
  position:fixed;
  top:var(--header-h);
  left:0;
  z-index:55;
  width:var(--rail-w);
  height:calc(100vh - var(--header-h));
  height:calc(100dvh - var(--header-h));
  overflow-y:auto;
  overscroll-behavior:contain;
  background:var(--night);
  color:var(--on-dark);
  border-right:1px solid var(--hair-dark);
}
.site-nav__inner{padding-bottom:28px;}

.site-nav__label{
  margin:0;
  padding:22px 20px 8px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  color:var(--on-dark-dim);
}

.site-nav__list{
  margin:0;
  padding:6px 0;
  list-style:none;
  counter-reset:navidx;
}
.site-nav__list>li{
  margin:0;
  counter-increment:navidx;
}
.site-nav__link{
  display:flex;
  align-items:center;
  gap:11px;
  padding:13px 20px 13px 18px;
  border-left:3px solid transparent;
  color:var(--on-dark);
  font-size:16px;
  line-height:1.4;
  text-decoration:none;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.site-nav__link::before{
  content:"[" counter(navidx,decimal-leading-zero) "]";
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--on-dark-dim);
  transition:color .18s ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible{
  color:var(--white);
  background:rgba(251,252,253,.06);
}
.site-nav__link:hover::before{color:var(--cyan);}

.site-nav__link[aria-current="page"]{
  color:var(--white);
  background:rgba(251,252,253,.09);
  border-left-color:var(--red);
}
.site-nav__link[aria-current="page"]::before{color:var(--red);}

.site-nav__note{
  margin:18px 20px 0;
  padding-top:16px;
  border-top:1px solid var(--hair-dark);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  line-height:1.8;
  letter-spacing:.04em;
  color:var(--on-dark-dim);
}

@media (max-width:999px){
  .site-nav{
    width:min(84vw,320px);
    transform:translateX(-100%);
    visibility:hidden;
    box-shadow:0 0 0 100vmax rgba(14,23,38,0);
    transition:transform .3s var(--ease),visibility .3s var(--ease),box-shadow .3s ease;
  }
  .site-nav[data-open]{
    transform:translateX(0);
    visibility:visible;
    box-shadow:0 0 0 100vmax rgba(14,23,38,.55);
  }
}
@media (min-width:1000px){
  .site-nav{transform:none;visibility:visible;}
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:88px;
  background:var(--night);
  color:var(--on-dark);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:4px;
  background:repeating-linear-gradient(115deg,var(--red) 0 14px,transparent 14px 28px);
}

.site-footer__grid{
  display:grid;
  gap:34px;
  padding-block:52px 34px;
  grid-template-columns:1fr;
}
@media (min-width:700px){
  .site-footer__grid{grid-template-columns:repeat(2,1fr);gap:38px;}
}
@media (min-width:1080px){
  .site-footer__grid{grid-template-columns:1.5fr 1fr 1.25fr 1fr;gap:40px;padding-block:60px 40px;}
}

.site-footer__col{min-width:0;}

.site-footer__brand{
  margin:0;
  font-family:var(--font-display);
  font-weight:900;
  font-size:26px;
  line-height:1.2;
  letter-spacing:-.02em;
  color:var(--white);
}
.site-footer__tagline{
  margin:10px 0 0;
  max-width:24em;
  font-size:14px;
  line-height:1.8;
  color:var(--on-dark-dim);
}
.site-footer__meta{
  display:flex;
  align-items:center;
  gap:9px;
  margin:16px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--on-dark);
}
.site-footer__meta .dot{width:7px;height:7px;}

.site-footer__title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  line-height:1.4;
  color:var(--white);
}

.footer-list{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:9px;
}
.footer-list li{margin:0;}
.footer-list a{
  display:inline-block;
  color:var(--on-dark);
  font-size:16px;
  line-height:1.5;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-list a:hover,.footer-list a:focus-visible{
  color:var(--white);
  border-bottom-color:var(--red);
}

.footer-contact{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:11px;
  font-size:14px;
}
.footer-contact li{
  display:grid;
  grid-template-columns:42px 1fr;
  gap:10px;
  align-items:start;
  margin:0;
}
.footer-contact__label{
  padding-top:2px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--on-dark-dim);
}
.footer-contact__value{
  color:var(--on-dark);
  line-height:1.65;
  word-break:break-word;
}

.site-footer__hint{
  margin:16px 0 0;
  padding-top:14px;
  border-top:1px solid var(--hair-dark);
  font-size:12px;
  line-height:1.8;
  color:var(--on-dark-dim);
}

.footer-legend{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:11px;
  font-size:14px;
  color:var(--on-dark);
}
.footer-legend li{
  display:flex;
  align-items:center;
  gap:10px;
  margin:0;
}

.site-footer__icp{
  margin:18px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--on-dark-dim);
}

.site-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-block:18px 30px;
  border-top:1px solid var(--hair-dark);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--on-dark-dim);
}
.site-footer__copy{margin:0;}

.footer-bottom-links{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
  margin:0;
  padding:0;
  list-style:none;
}
.footer-bottom-links li{margin:0;}
.footer-bottom-links a{
  color:var(--on-dark-dim);
  text-decoration:none;
  border-bottom:1px solid var(--hair-dark);
  padding-bottom:1px;
  transition:color .18s ease,border-color .18s ease;
}
.footer-bottom-links a:hover,.footer-bottom-links a:focus-visible{
  color:var(--white);
  border-bottom-color:var(--red);
}

/* =========================================================
   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;
  }
  [data-reveal]{opacity:1 !important;transform:none !important;}
}