:root{
  --ink-900:#08262F;
  --blue-700:#0E4A5F;
  --mist:#7FB3C4;
  --fog:#D7E3E8;
  --lime:#A8E05A;
  --green:#3E7A2E;
  --paper:#F4EEE3;
  --edge:#E4D9C6;
  --graphite:#1B1F22;
  --clay:#B5543A;

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

  --wrap:1240px;
  --gutter:clamp(16px,4vw,48px);
  --hdr-h:78px;
  --ease:cubic-bezier(.22,1,.36,1);
  --hair:rgba(14,74,95,.16);
  --hair-light:rgba(127,179,196,.24);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--graphite);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.is-nav-open{overflow:hidden}
h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.06;
  letter-spacing:-.01em;
  color:var(--ink-900);
}
h1{font-size:clamp(38px,6vw,76px)}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(19px,2vw,24px);line-height:1.2}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0 0 1em;padding-left:1.2em}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
strong{font-weight:700;color:var(--ink-900)}
::selection{background:var(--lime);color:var(--ink-900)}

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

.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 容器与节奏 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
#main-content{display:block;scroll-margin-top:calc(var(--hdr-h) + 20px)}
#main-content:focus{outline:none}
.section{padding-block:clamp(48px,7vw,104px)}
.section--tight{padding-block:clamp(32px,4vw,56px)}
.section__head{display:grid;gap:14px;margin-bottom:clamp(24px,3vw,40px);max-width:46em}
.rule{height:1px;border:0;margin:0;background:var(--edge)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--blue-700);
}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--lime);display:block}
.label-mono{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.16em;
  color:var(--blue-700);
}
.prose{max-width:32em}
.prose p{font-size:17px;line-height:1.75}
.prose ul{font-size:17px;line-height:1.75}
.prose a{border-bottom:1px solid var(--green);color:var(--green)}

.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--mirror{grid-template-columns:repeat(2,minmax(0,1fr));position:relative}
.grid--mirror::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;width:1px;
  background:var(--hair);transform:translateX(-.5px);
}
.grid-lines{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(14,74,95,.10) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(14,74,95,.10) 1px,transparent 1px);
  background-size:clamp(48px,8vw,96px) clamp(48px,8vw,96px);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.25) 72%,transparent 100%);
  mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.25) 72%,transparent 100%);
}

/* ---------- 切角面板 / 标签 ---------- */
.panel{
  position:relative;
  padding:clamp(18px,3vw,32px);
  background:var(--paper);
  border:1px solid var(--edge);
}
.panel--cut{
  border:0;
  background:var(--paper);
  box-shadow:inset 0 0 0 1px var(--edge);
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,20px 100%,0 calc(100% - 20px));
}
.panel--dark{
  background:var(--ink-900);
  color:var(--fog);
  border-color:transparent;
  box-shadow:inset 0 0 0 1px var(--hair-light);
}
.panel--dark h2,.panel--dark h3{color:var(--paper)}
.panel--fog{background:var(--fog);border-color:transparent}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.14em;line-height:1.4;
  padding:5px 9px;
  border:1px solid rgba(14,74,95,.35);
  color:var(--blue-700);
  background:transparent;
  white-space:nowrap;
}
.tag--lime{background:var(--lime);border-color:var(--lime);color:var(--ink-900)}
.tag--clay{border-color:var(--clay);color:var(--clay)}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.12em;
  color:rgba(27,31,34,.6);
  padding-block:18px;
}
.breadcrumbs__list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:var(--mist)}
.breadcrumbs__link{color:var(--blue-700);border-bottom:1px solid transparent}
.breadcrumbs__link:hover{border-bottom-color:var(--green)}
.breadcrumbs__item[aria-current="page"]{color:var(--graphite)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 16px;
  font-family:var(--font-body);
  font-size:13px;font-weight:700;letter-spacing:.06em;
  line-height:1.2;
  border:1px solid transparent;
  border-radius:2px;
  background:transparent;
  color:var(--ink-900);
  cursor:pointer;
  transition:background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.btn--lime{background:var(--lime);border-color:var(--lime);color:var(--ink-900)}
.btn--lime:hover{background:#b9ef74;border-color:#b9ef74}
.btn--ghost{border-color:rgba(168,224,90,.55);color:var(--paper)}
.btn--ghost:hover{background:rgba(168,224,90,.16);border-color:var(--lime)}
.btn--solid{background:var(--blue-700);border-color:var(--blue-700);color:var(--paper)}
.btn--solid:hover{background:var(--ink-900);border-color:var(--ink-900)}
.btn--line{border-color:rgba(14,74,95,.4);color:var(--blue-700)}
.btn--line:hover{background:var(--fog);border-color:var(--blue-700)}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--fog);
  border:1px solid var(--edge);
  border-radius:2px;
}
.media--wide{aspect-ratio:16/7}
.media--band{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media__img{
  display:block;width:100%;height:100%;object-fit:cover;
  transition:transform .6s var(--ease);
}
.media:hover .media__img,
.media:focus-within .media__img{transform:scale(1.04)}
.media__ph{
  position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  background:
    repeating-linear-gradient(135deg,rgba(14,74,95,.12) 0 1px,transparent 1px 14px),
    var(--fog);
  color:var(--blue-700);
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.2em;text-transform:uppercase;
}
.media__index{
  position:absolute;left:12px;top:12px;z-index:2;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.16em;
  background:var(--ink-900);
  color:var(--lime);
  padding:4px 8px;
}

/* ---------- 分段标签 ---------- */
.tabs{display:block}
.tabs__list{
  display:flex;flex-wrap:wrap;gap:4px;
  margin:0;padding:0;
}
.tabs__tab{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.12em;
  padding:11px 16px;
  background:transparent;
  border:1px solid rgba(14,74,95,.28);
  color:var(--blue-700);
  cursor:pointer;
  transition:background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.tabs__tab:hover{background:var(--fog)}
.tabs__tab[aria-selected="true"]{
  background:var(--ink-900);
  border-color:var(--ink-900);
  color:var(--lime);
}
.tabs__panel{padding-top:clamp(20px,3vw,32px)}
.tabs__panel[hidden]{display:none}

/* ---------- 显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-inview{opacity:1;transform:none}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  transform:translateY(-160%);
  padding:10px 16px;
  background:var(--lime);
  color:var(--ink-900);
  font-weight:700;
  font-size:14px;
  border-radius:2px;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:none}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:100;
  color:var(--paper);
  background:linear-gradient(180deg,rgba(8,38,47,.82) 0%,rgba(8,38,47,.34) 62%,rgba(8,38,47,0) 100%);
  transition:background .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header[data-scrolled]{
  background:var(--blue-700);
  box-shadow:0 1px 0 rgba(168,224,90,.42);
}
.site-header__inner{
  position:relative;
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  height:var(--hdr-h);
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(14px,2.4vw,40px);
}
.brand{display:flex;align-items:baseline;gap:12px;min-width:0}
.brand__link{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-display);
  font-weight:800;
  font-size:17px;
  letter-spacing:.02em;
  color:var(--paper);
}
.brand__mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:30px;height:30px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.06em;font-weight:700;
  color:var(--ink-900);
  background:var(--lime);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
}
.brand__text{white-space:nowrap}
.brand__sep{color:var(--lime);padding-inline:2px}
.brand__index{
  display:none;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.2em;
  color:rgba(127,179,196,.85);
  border-left:1px solid var(--hair-light);
  padding-left:12px;
}
.nav{justify-self:center}
.nav__list{display:flex;align-items:center;gap:clamp(8px,1.6vw,26px);list-style:none;margin:0;padding:0}
.nav__item{display:block}
.nav__link{
  position:relative;
  display:block;
  padding:9px 2px;
  font-size:14px;
  letter-spacing:.05em;
  color:rgba(244,238,227,.84);
  transition:color .2s var(--ease);
}
.nav__link::after{
  content:"";
  position:absolute;left:0;right:0;bottom:2px;height:2px;
  background:var(--lime);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .24s var(--ease);
}
.nav__link:hover,.nav__link:focus-visible{color:var(--paper)}
.nav__link:hover::after,.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--lime)}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav__foot{display:none}
.nav__foot-link{flex:1 1 0}
.header__actions{display:flex;align-items:center;gap:10px}
.header__util{
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.16em;
  color:var(--mist);
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  white-space:nowrap;
}
.header__util:hover{color:var(--lime);border-bottom-color:var(--lime)}
.nav-toggle{
  display:none;
  align-items:center;gap:10px;
  justify-self:end;
  padding:10px 12px;
  background:transparent;
  border:1px solid rgba(168,224,90,.45);
  border-radius:2px;
  color:var(--paper);
  cursor:pointer;
}
.nav-toggle__bars{display:grid;gap:4px;width:20px}
.nav-toggle__bars span{
  display:block;height:2px;background:currentColor;
  transition:transform .24s var(--ease),opacity .2s var(--ease);
}
.nav-toggle__label{
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.16em;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.scroll-meter{
  position:absolute;left:0;right:0;bottom:0;
  height:2px;
  overflow:hidden;
}
.scroll-meter__bar{
  display:block;width:100%;height:100%;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:left center;
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,120px);
  background:var(--ink-900);
  color:var(--fog);
  font-size:15px;
}
.site-footer__rule{
  height:2px;
  background:linear-gradient(90deg,var(--lime) 0%,rgba(168,224,90,.35) 42%,rgba(168,224,90,0) 100%);
}
.site-footer__inner{
  display:grid;
  grid-template-columns:1.1fr 2fr;
  gap:clamp(28px,5vw,72px);
  padding-block:clamp(40px,6vw,72px);
}
.footer-brand__link{
  display:inline-block;
  font-family:var(--font-display);
  font-weight:800;
  font-size:22px;
  letter-spacing:.02em;
  color:var(--paper);
}
.footer-brand__link:hover{color:var(--lime)}
.footer-brand__line{
  margin-top:12px;
  max-width:24em;
  font-size:14px;
  line-height:1.7;
  color:var(--mist);
}
.footer-brand__index{
  margin:18px 0 0;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.22em;
  color:rgba(127,179,196,.68);
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,3vw,32px);
}
.footer-col__title{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;font-weight:500;letter-spacing:.2em;text-transform:uppercase;
  color:var(--lime);
}
.footer-col__list{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:10px}
.footer-col__link{
  display:inline-block;
  font-size:14px;
  color:var(--fog);
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-col__link:hover{color:var(--lime);border-bottom-color:var(--lime)}
.footer-contact{
  grid-column:1 / -1;
  display:grid;gap:10px;
  margin-top:clamp(8px,2vw,16px);
  padding-top:clamp(20px,3vw,28px);
  border-top:1px solid var(--hair-light);
}
.footer-contact__row{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:12px;
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;letter-spacing:.02em;
}
.footer-contact__label{
  min-width:76px;
  font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:rgba(127,179,196,.68);
}
.footer-contact__value{color:var(--paper)}
.site-footer__legal{
  display:flex;flex-wrap:wrap;align-items:baseline;
  gap:clamp(12px,3vw,32px);
  padding-block:22px 34px;
  border-top:1px solid var(--hair-light);
}
.footer-icp{
  margin:0;
  font-family:var(--font-mono);
  font-size:18px;letter-spacing:.06em;
  font-variant-numeric:tabular-nums;
  color:var(--paper);
}
.footer-domain{
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;letter-spacing:.1em;
  color:var(--mist);
}
.footer-copy{
  margin:0 0 0 auto;
  font-size:12px;letter-spacing:.04em;
  color:rgba(127,179,196,.75);
}

/* ---------- 平板 ---------- */
@media (min-width:720px){
  .brand__index{display:inline-block}
}
@media (max-width:1023px){
  .grid--thirds{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__inner{grid-template-columns:1fr}
  .site-footer__legal{padding-block:20px 32px}
  .footer-copy{margin-left:0}
}

/* ---------- 移动导航 ---------- */
@media (max-width:1099px){
  .site-header__inner{grid-template-columns:1fr auto;height:66px}
  .header__actions{display:none}
  .nav-toggle{display:inline-flex}
  .nav{
    position:fixed;
    top:0;right:0;bottom:0;left:auto;
    width:min(86vw,400px);
    display:flex;
    flex-direction:column;
    justify-content:space-between;
    gap:24px;
    padding:calc(66px + 28px) var(--gutter) 32px;
    background:var(--ink-900);
    border-left:1px solid var(--hair-light);
    box-shadow:-24px 0 48px rgba(8,38,47,.32);
    overflow-y:auto;
    visibility:hidden;
    transform:translateX(102%);
    transition:transform .32s var(--ease),visibility .32s var(--ease);
  }
  .nav[data-open]{
    visibility:visible;
    transform:translateX(0);
  }
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    padding:16px 0;
    font-family:var(--font-display);
    font-size:22px;
    font-weight:700;
    letter-spacing:.01em;
    color:var(--paper);
    border-bottom:1px solid var(--hair-light);
  }
  .nav__link::after{bottom:0;height:2px;right:auto;width:36px}
  .nav__link[aria-current="page"]{color:var(--lime)}
  .nav__foot{display:flex;gap:10px;flex-wrap:wrap}
}

/* ---------- 手机 ---------- */
@media (max-width:719px){
  body{font-size:16px}
  :root{--hdr-h:66px}
  .grid--halves,.grid--thirds,.grid--mirror{grid-template-columns:1fr}
  .grid--mirror::before{display:none}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact__label{min-width:100%}
  .footer-icp{font-size:16px}
  .brand__index{display:none}
  .nav-toggle__label{display:none}
}
@media (max-width:479px){
  .footer-cols{grid-template-columns:1fr}
  .panel,.panel--cut{padding:18px}
}

/* ---------- 减少动效 ---------- */
@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;transform:none}
  .media:hover .media__img,.media:focus-within .media__img{transform:none}
  .scroll-meter__bar{transition:none}
}