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

/* ============ 2. 变量 ============ */
:root{
  --ink-900:#02100C;
  --ink-800:#061F18;
  --pitch:#0B3D2E;
  --lime:#C8FF3D;
  --lime-soft:#E8FF9B;
  --wine:#5B1230;
  --orange:#FF8A2A;
  --mist:#EAF7EE;
  --sage:#9BB8AA;
  --cyan:#59D6C0;

  --line:rgba(155,184,170,.20);
  --line-soft:rgba(155,184,170,.11);
  --line-strong:rgba(200,255,61,.42);
  --shadow-deep:0 30px 70px -38px rgba(0,0,0,.95);

  --ease:cubic-bezier(.2,.8,.2,1);

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

  --shell-w:1240px;
  --header-h:64px;
}

/* ============ 3. 基础排版 ============ */
body{
  min-height:100vh;
  overflow-x:hidden;
  background-color:var(--ink-800);
  background-image:
    radial-gradient(1200px 620px at 84% -12%, rgba(11,61,46,.85), transparent 68%),
    radial-gradient(920px 540px at -12% 10%, rgba(91,18,48,.30), transparent 66%),
    linear-gradient(180deg,#061F18 0%, #04160F 55%, #02100C 100%);
  color:var(--mist);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4,.display{
  font-family:var(--font-display);
  font-weight:300;
  line-height:1.12;
  letter-spacing:.005em;
  text-transform:uppercase;
}
h1,.display{font-size:clamp(2.3rem,5.4vw,4.4rem)}
h2{font-size:clamp(1.6rem,3vw,2.5rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.45rem);letter-spacing:.02em}
p{max-width:74ch}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.index-label{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.4;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--lime);
}
::selection{background:var(--lime);color:var(--ink-900)}

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

/* ============ 4. 跳过链接 / 进度条 ============ */
.skip-link{
  position:fixed;
  top:10px;left:50%;
  z-index:400;
  padding:11px 20px;
  border-radius:999px;
  background:var(--lime);
  color:var(--ink-900);
  font-size:14px;font-weight:500;letter-spacing:.05em;
  transform:translate(-50%,-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translate(-50%,0)}

.scroll-meter{
  position:fixed;
  inset:0 0 auto 0;
  height:2px;
  z-index:300;
  background:rgba(200,255,61,.09);
  pointer-events:none;
}
.scroll-meter__bar{
  display:block;
  height:100%;width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--lime) 0%,var(--cyan) 58%,var(--orange) 100%);
}

/* ============ 5. 头部 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:200;
  padding:14px 0 10px;
  background:linear-gradient(180deg,rgba(2,16,12,0),rgba(2,16,12,0));
  transition:background .28s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:linear-gradient(180deg,rgba(2,16,12,.94) 12%,rgba(2,16,12,.55) 68%,rgba(2,16,12,0) 100%);
}

.header-shell{
  display:flex;
  align-items:center;
  gap:16px;
  width:min(var(--shell-w),calc(100% - 32px));
  margin-inline:auto;
  min-height:var(--header-h);
  padding:9px 12px 9px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(6,31,24,.80);
  box-shadow:var(--shadow-deep);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  padding:3px 2px;
}
.brand__mark{
  position:relative;
  width:26px;height:26px;
  flex:0 0 auto;
  background:linear-gradient(142deg,var(--lime) 0%,var(--lime-soft) 52%,var(--cyan) 100%);
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand__mark::after{
  content:"";
  position:absolute;
  inset:6px;
  border:1px solid rgba(2,16,12,.55);
}
.brand__text{display:block;min-width:0}
.brand__name{
  display:block;
  font-family:var(--font-display);
  font-size:19px;
  line-height:1;
  letter-spacing:.08em;
  color:var(--mist);
  text-transform:uppercase;
}
.brand__tag{
  display:block;
  margin-top:4px;
  font-family:var(--font-mono);
  font-size:9.5px;
  line-height:1;
  letter-spacing:.2em;
  color:var(--sage);
  text-transform:uppercase;
  white-space:nowrap;
}

.primary-nav{margin-inline:auto;min-width:0}
.primary-nav__list{display:flex;align-items:center;gap:3px}
.primary-nav__list a{
  display:block;
  padding:8px 13px;
  border-radius:999px;
  font-size:14px;
  line-height:1.3;
  letter-spacing:.02em;
  color:var(--sage);
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.primary-nav__list a:hover{color:var(--mist);background:rgba(200,255,61,.09)}
.primary-nav__list a[aria-current="page"]{
  color:var(--ink-900);
  background:var(--lime);
  font-weight:500;
}
.primary-nav__list a[aria-current="page"]:hover{background:var(--lime-soft);color:var(--ink-900)}

.nav-quick{display:none}

.header-actions{display:flex;align-items:center;gap:6px;flex:0 0 auto}

.chip{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:13px;
  line-height:1.3;
  letter-spacing:.02em;
  color:var(--sage);
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.chip:hover{color:var(--mist);border-color:var(--line-strong);background:rgba(200,255,61,.08)}
.chip--lime{background:var(--lime);border-color:var(--lime);color:var(--ink-900);font-weight:500}
.chip--lime:hover{background:var(--lime-soft);border-color:var(--lime-soft);color:var(--ink-900)}
.chip--orange{background:rgba(255,138,42,.14);border-color:rgba(255,138,42,.48);color:#FFC08A}
.chip--orange:hover{background:rgba(255,138,42,.24);border-color:var(--orange);color:#FFD9B8}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:8px 15px 8px 13px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;left:0;
  width:100%;height:1.5px;
  background:var(--lime);
  transition:transform .26s var(--ease),top .26s var(--ease);
}
.nav-toggle__bars::before{top:1px}
.nav-toggle__bars::after{top:7px}
.site-header[data-open="true"] .nav-toggle{border-color:var(--lime);color:var(--lime)}
.site-header[data-open="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

/* ============ 6. 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,112px);
  padding-bottom:clamp(26px,4vw,42px);
  overflow:hidden;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(2,16,12,.55) 0%,rgba(2,16,12,.96) 42%,#02100C 100%);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(155,184,170,.07) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(155,184,170,.07) 1px,transparent 1px);
  background-size:78px 78px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.75),transparent 72%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.75),transparent 72%);
}
.footer-rail{
  display:block;
  position:relative;
  height:2px;width:100%;
  background:linear-gradient(90deg,transparent 0%,var(--lime) 24%,var(--cyan) 56%,var(--orange) 80%,transparent 100%);
  opacity:.85;
}
.footer-shell{
  position:relative;
  width:min(var(--shell-w),calc(100% - 40px));
  margin-inline:auto;
  padding-top:clamp(30px,4.6vw,58px);
}

.footer-lead{max-width:64ch}
.footer-brand{
  font-family:var(--font-display);
  font-size:clamp(1.5rem,2.6vw,2.1rem);
  line-height:1.1;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-summary{
  margin-top:12px;
  font-size:15px;
  line-height:1.8;
  color:var(--sage);
  max-width:58ch;
}
.footer-note{
  margin-top:12px;
  font-size:12.5px;
  line-height:1.7;
  color:rgba(155,184,170,.78);
  max-width:52ch;
}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3.4vw,48px);
  margin-top:clamp(28px,4vw,48px);
  padding-top:clamp(22px,3vw,34px);
  border-top:1px solid var(--line-soft);
}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--lime);
}
.footer-col__title::after{
  content:"";
  flex:1 1 auto;
  height:1px;
  background:linear-gradient(90deg,var(--line-strong),transparent);
}
.footer-list{display:grid;gap:9px}
.footer-list a{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  color:var(--sage);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-list a:hover{color:var(--mist);transform:translateX(3px)}

.footer-meta{display:grid;gap:10px}
.footer-meta__row{
  display:grid;
  grid-template-columns:46px minmax(0,1fr);
  gap:10px;
  align-items:baseline;
}
.footer-meta__key{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:rgba(155,184,170,.7);
}
.footer-meta__val{
  font-size:13.5px;
  line-height:1.6;
  color:var(--mist);
  word-break:break-word;
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(28px,4vw,46px);
  padding-top:18px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:rgba(155,184,170,.8);
}
.footer-icp{white-space:nowrap}
.footer-copy{display:flex;align-items:center;gap:6px;white-space:nowrap}
.footer-copy__year{color:var(--lime)}

/* ============ 7. 布局与通用组件 ============ */
.shell{
  width:min(var(--shell-w),calc(100% - 40px));
  margin-inline:auto;
}
.section{position:relative;padding-block:clamp(34px,5vw,72px)}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px 28px;
  margin-bottom:clamp(20px,3vw,34px);
}
.section-head__index{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--lime);
}
.section-head__title{margin:0}
.rule{
  display:block;
  height:1px;width:100%;
  border:0;
  background:linear-gradient(90deg,var(--line-strong),var(--line-soft) 42%,transparent 100%);
}

.grid{display:grid;gap:clamp(14px,2vw,26px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.rail-layout{
  display:grid;
  grid-template-columns:minmax(210px,258px) minmax(0,1fr);
  gap:clamp(20px,3.2vw,46px);
  align-items:start;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 26px;
  border:1px solid transparent;
  border-radius:2px;
  font-size:14px;
  line-height:1.3;
  letter-spacing:.06em;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--primary{background:var(--lime);color:var(--ink-900);font-weight:500}
.btn--primary:hover{background:var(--lime-soft)}
.btn--ghost{border-color:var(--line-strong);color:var(--mist)}
.btn--ghost:hover{background:rgba(200,255,61,.1);border-color:var(--lime);color:var(--lime)}
.btn--small{padding:9px 16px;font-size:12.5px;letter-spacing:.05em}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.5;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--sage);
}
.tag--lime{background:var(--lime);border-color:var(--lime);color:var(--ink-900)}
.tag--wine{background:rgba(91,18,48,.85);border-color:rgba(255,138,42,.4);color:#FFC9D6}
.tag--orange{background:var(--orange);border-color:var(--orange);color:var(--ink-900)}

.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(155,184,170,.8);
}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs__item{display:flex;align-items:center;gap:8px}
.breadcrumbs__item + .breadcrumbs__item::before{
  content:"/";
  color:rgba(200,255,61,.55);
}
.breadcrumbs a:hover{color:var(--lime)}

/* 图片容器：页面阶段放置 img 或留空占位 */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--line);
  background:
    radial-gradient(120% 90% at 16% 6%,rgba(89,214,192,.20),transparent 62%),
    linear-gradient(158deg,rgba(11,61,46,.92) 0%,rgba(6,31,24,.96) 48%,rgba(2,16,12,.98) 100%);
  isolation:isolate;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(155,184,170,.10) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(155,184,170,.10) 1px,transparent 1px);
  background-size:44px 44px;
  mix-blend-mode:screen;
  opacity:.85;
}
.media-frame > img,
.media-frame__img{
  position:relative;
  z-index:1;
  width:100%;height:100%;
  object-fit:cover;
  filter:saturate(.92) contrast(1.06) brightness(.92);
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame__caption{
  position:absolute;
  z-index:2;
  left:0;bottom:0;
  padding:8px 12px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
  background:rgba(2,16,12,.82);
  border-top:1px solid var(--line-strong);
  border-right:1px solid var(--line-strong);
}

/* 滚动显现 */
[data-reveal].is-armed{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
  will-change:opacity,transform;
}
[data-reveal].is-armed.is-visible{opacity:1;transform:none}

/* ============ 8. 响应式 ============ */
@media (max-width:1080px){
  .primary-nav__list a{padding:8px 10px;font-size:13px}
  .header-actions .chip{padding:7px 11px;font-size:12.5px}
}
@media (max-width:960px){
  .header-actions{display:none}
  .nav-toggle{display:inline-flex}
  .header-shell{padding:8px 10px 8px 14px}
  .primary-nav{
    position:fixed;
    left:12px;right:12px;bottom:12px;
    z-index:300;
    margin:0;
    padding:14px;
    border:1px solid var(--line-strong);
    border-radius:22px;
    background:rgba(2,16,12,.97);
    box-shadow:0 26px 60px -26px rgba(0,0,0,.95);
    opacity:0;
    visibility:hidden;
    transform:translateY(calc(100% + 26px));
    transition:transform .3s var(--ease),opacity .24s var(--ease),visibility .3s linear;
  }
  .site-header[data-open="true"] .primary-nav{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .primary-nav__list a{padding:12px 14px;border-radius:12px;font-size:15px}
  .primary-nav__list a[aria-current="page"]{border-left:2px solid var(--ink-900)}
  .nav-quick{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
    margin-top:12px;
    padding-top:12px;
    border-top:1px solid var(--line-soft);
  }
  .nav-quick .chip{flex:1 1 auto;justify-content:center;padding:10px 12px}
  .rail-layout{grid-template-columns:1fr}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col--contact{grid-column:1 / -1}
}
@media (max-width:640px){
  .shell,
  .header-shell,
  .footer-shell{width:calc(100% - 28px)}
  .brand__tag{font-size:9px;letter-spacing:.16em}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-base{flex-direction:column;align-items:flex-start;gap:8px}
  .footer-meta__row{grid-template-columns:42px minmax(0,1fr)}
  .media-frame{aspect-ratio:4 / 3}
}
@media (max-width:420px){
  .brand__tag{display:none}
  .nav-toggle__label{display:none}
  .nav-toggle{padding:9px 12px}
}

/* ============ 9. 无障碍动效 ============ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal].is-armed{opacity:1;transform:none}
  .footer-list a:hover{transform:none}
}