:root{
  --paper:#F6F0E4;
  --navy:#0B2A4A;
  --ink:#071A2B;
  --coral:#F2643C;
  --mint:#2CE5B4;
  --brown:#4A332A;
  --sand:#E7DCC8;
  --mist:#6E8FA8;
  --rust:#C8451F;
  --card-bg:#FBF6EC;
  --frame-line:rgba(11,42,74,.16);
  --gutter:clamp(16px,3.2vw,40px);
  --font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",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:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --ease-out:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{ margin:0; }
img,svg,picture,video{ display:block; max-width:100%; }
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{ margin:0; }
ul,ol{ padding:0; list-style:none; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; color:inherit; background:none; border:0; padding:0; cursor:pointer; }
summary{ cursor:pointer; }
table{ border-collapse:collapse; width:100%; }

body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

::selection{ background:var(--mint); color:var(--ink); }

:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{
  outline:3px solid var(--mint);
  outline-offset:3px;
  border-radius:2px;
}

#main-content{ scroll-margin-top:96px; }

/* ============ 框架：页头 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--navy);
  color:var(--paper);
  isolation:isolate;
}

.header-frame{
  max-width:1480px;
  margin-inline:auto;
  padding:10px var(--gutter);
  min-height:70px;
  display:flex;
  align-items:center;
  gap:clamp(12px,2.2vw,36px);
}

.header-brand{ flex:0 0 auto; }

.brand-lockup{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--paper);
}

.brand-mark{
  width:34px;
  height:34px;
  flex:0 0 34px;
  border:2px solid var(--mint);
  transform:skewX(-12deg);
  display:grid;
  place-items:center;
  transition:border-color .25s var(--ease-out);
}
.brand-mark::before{
  content:"";
  width:11px;
  height:11px;
  background:var(--coral);
  transform:skewX(12deg) rotate(45deg);
  transition:background .25s var(--ease-out);
}
.brand-lockup:hover .brand-mark{ border-color:var(--coral); }
.brand-lockup:hover .brand-mark::before{ background:var(--mint); }

.brand-text{ display:flex; flex-direction:column; line-height:1.2; }
.brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:19px;
  letter-spacing:.04em;
  white-space:nowrap;
}
.brand-tagline{
  margin-top:2px;
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
  white-space:nowrap;
}

.site-nav{ margin-inline:auto; }

.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(2px,1.3vw,20px);
}
.nav-item{ display:block; }

.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:9px 3px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.03em;
  color:rgba(246,240,228,.8);
  white-space:nowrap;
  transition:color .25s var(--ease-out);
}
.nav-index{
  font-family:var(--font-mono);
  font-size:10px;
  line-height:1;
  letter-spacing:.06em;
  color:var(--mist);
  transform:translateY(-3px);
  transition:color .25s var(--ease-out);
}
.nav-label{ position:relative; }
.nav-label::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-5px;
  height:2px;
  background:var(--coral);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s var(--ease-out);
}
.nav-link:hover{ color:var(--paper); }
.nav-link:hover .nav-index{ color:var(--coral); }
.nav-link:hover .nav-label::after{ transform:scaleX(1); }
.nav-link[aria-current="page"]{ color:var(--mint); }
.nav-link[aria-current="page"] .nav-index{ color:var(--coral); }
.nav-link[aria-current="page"] .nav-label::after{
  transform:scaleX(1);
  background:var(--mint);
}

.nav-foot-note{ display:none; }

.header-actions{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:10px;
}

.header-ruler{
  height:6px;
  background-image:repeating-linear-gradient(90deg,rgba(246,240,228,.5) 0 1px,transparent 1px 16px);
  background-size:16px 3px;
  background-repeat:repeat-x;
  background-position:0 0;
  border-top:1px solid rgba(246,240,228,.12);
}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.1;
  border:1px solid transparent;
  border-radius:2px;
  transition:background .24s var(--ease-out),color .24s var(--ease-out),border-color .24s var(--ease-out),transform .24s var(--ease-out);
}
.btn-primary{
  background:var(--coral);
  color:var(--ink);
  border-color:var(--coral);
}
.btn-primary:hover{
  background:var(--mint);
  border-color:var(--mint);
  transform:translateY(-1px);
}
.btn-ghost{
  background:transparent;
  color:var(--paper);
  border-color:rgba(246,240,228,.42);
}
.btn-ghost:hover{
  color:var(--mint);
  border-color:var(--mint);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:10px 13px;
  border:1px solid rgba(246,240,228,.36);
  border-radius:2px;
  color:var(--paper);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  transition:border-color .24s var(--ease-out),color .24s var(--ease-out);
}
.nav-toggle:hover{ border-color:var(--coral); color:var(--coral); }
.nav-toggle-bars{
  position:relative;
  width:20px;
  height:12px;
  flex:0 0 20px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0; right:0;
  height:2px;
  background:currentColor;
  transition:transform .26s var(--ease-out);
}
.nav-toggle-bars::before{ top:0; }
.nav-toggle-bars::after{ bottom:0; }
.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); }
.nav-toggle-label{ display:inline-block; }

/* 跳转链接 */
.skip-link{
  position:fixed;
  top:0;
  left:50%;
  z-index:300;
  padding:12px 22px;
  background:var(--coral);
  color:var(--ink);
  font-size:14px;
  font-weight:700;
  border-radius:0 0 3px 3px;
  transform:translate(-50%,-180%);
  transition:transform .22s var(--ease-out);
}
.skip-link:focus,
.skip-link:focus-visible{
  transform:translate(-50%,0);
  outline-offset:-6px;
}

/* ============ 框架：页脚 ============ */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--paper);
  border-top:1px solid rgba(246,240,228,.14);
}
.footer-ruler{
  height:6px;
  background-image:repeating-linear-gradient(90deg,rgba(44,229,180,.55) 0 1px,transparent 1px 18px);
  background-size:18px 3px;
  background-repeat:repeat-x;
}

.footer-frame{
  max-width:1480px;
  margin-inline:auto;
  padding:clamp(34px,4.6vw,60px) var(--gutter) clamp(22px,3vw,34px);
}

.footer-lead{
  border-left:3px solid var(--coral);
  padding-left:clamp(14px,2vw,22px);
  margin-bottom:clamp(26px,3.6vw,44px);
}
.footer-brand{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(19px,2.4vw,27px);
  line-height:1.3;
  letter-spacing:.02em;
}
.footer-note{
  margin-top:10px;
  max-width:56ch;
  font-size:14px;
  line-height:1.7;
  color:rgba(246,240,228,.64);
}

.footer-grid{
  display:grid;
  grid-template-columns:1.05fr 1fr 1.25fr;
  gap:clamp(22px,3.6vw,54px);
  padding-top:clamp(22px,3vw,34px);
  border-top:1px solid rgba(246,240,228,.14);
}

.footer-col{ min-width:0; }

.footer-title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mint);
}

.footer-links{ display:grid; gap:9px; }
.footer-links a{
  display:inline-block;
  font-size:15px;
  color:rgba(246,240,228,.8);
  border-bottom:1px solid transparent;
  transition:color .22s var(--ease-out),border-color .22s var(--ease-out);
}
.footer-links a:hover{
  color:var(--paper);
  border-bottom-color:var(--coral);
}

.contact-list{ display:grid; gap:11px; }
.contact-list li{
  display:flex;
  gap:12px;
  font-size:14px;
  line-height:1.65;
  color:rgba(246,240,228,.78);
}
.contact-key{
  flex:0 0 46px;
  padding-top:3px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--mist);
}
.contact-value{ min-width:0; word-break:break-word; }

.change-log{
  border:1px solid rgba(246,240,228,.18);
  border-radius:2px;
  background:rgba(246,240,228,.03);
}
.change-log__summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:12px 14px;
  font-size:14px;
  font-weight:600;
  color:var(--paper);
  list-style:none;
}
.change-log__summary::-webkit-details-marker{ display:none; }
.change-log__summary::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:16px;
  line-height:1;
  color:var(--coral);
  transition:transform .26s var(--ease-out);
}
.change-log[open] .change-log__summary::after{ transform:rotate(45deg); }
.change-log__list{
  padding:0 14px 14px;
  display:grid;
  gap:8px;
  font-size:13.5px;
  line-height:1.65;
  color:rgba(246,240,228,.72);
}
.change-log__list li{
  position:relative;
  padding-left:14px;
}
.change-log__list li::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:6px;
  height:1px;
  background:var(--mint);
}

.footer-bottom{
  margin-top:clamp(26px,3.6vw,44px);
  padding-top:18px;
  border-top:1px solid rgba(246,240,228,.14);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px clamp(16px,3vw,30px);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  color:rgba(246,240,228,.6);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
}
.footer-legal a{
  border-bottom:1px solid rgba(246,240,228,.32);
  transition:color .22s var(--ease-out),border-color .22s var(--ease-out);
}
.footer-legal a:hover{
  color:var(--mint);
  border-bottom-color:var(--mint);
}
.footer-copy{ margin-left:auto; }

/* ============ 通用版式组件 ============ */
.container{
  width:100%;
  max-width:1180px;
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--wide{ max-width:1480px; }
.container--narrow{ max-width:820px; }

.section{ padding-block:clamp(40px,6vw,88px); }
.section--tight{ padding-block:clamp(26px,3.6vw,50px); }
.section--sand{ background:var(--sand); }
.section--navy{ background:var(--navy); color:var(--paper); }

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--rust);
}
.eyebrow::before{
  content:"";
  width:24px;
  height:2px;
  background:var(--coral);
}
.section--navy .eyebrow{ color:var(--mint); }
.section--navy .eyebrow::before{ background:var(--mint); }

.display-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(30px,4.8vw,54px);
  line-height:1.1;
  letter-spacing:-.01em;
}
.section-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(21px,2.9vw,34px);
  line-height:1.22;
  letter-spacing:-.005em;
}
.lede{
  max-width:64ch;
  font-size:clamp(15px,1.5vw,17px);
  line-height:1.8;
  color:var(--brown);
}
.section--navy .lede{ color:rgba(246,240,228,.78); }

.tick-rule{
  height:1px;
  background-image:repeating-linear-gradient(90deg,var(--navy) 0 1px,transparent 1px 12px);
  opacity:.32;
}
.section--navy .tick-rule{
  background-image:repeating-linear-gradient(90deg,rgba(246,240,228,.7) 0 1px,transparent 1px 12px);
}

.grid{
  display:grid;
  gap:clamp(16px,2.4vw,28px);
}
.grid--2{ grid-template-columns:repeat(2,minmax(0,1fr)); }
.grid--3{ grid-template-columns:repeat(3,minmax(0,1fr)); }
.grid--auto{ grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); }

.card{
  position:relative;
  background:var(--card-bg);
  border:1px solid var(--frame-line);
  border-radius:2px;
  padding:clamp(18px,2.4vw,28px);
}
.card--navy{
  background:var(--navy);
  color:var(--paper);
  border-color:var(--navy);
}
.card--navy .data-label{ color:var(--mist); }
.card--accent{ border-left:4px solid var(--coral); }

.data-figure{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(30px,4.4vw,52px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--navy);
  font-variant-numeric:tabular-nums;
}
.data-figure--mint{ color:var(--mint); }
.data-label{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--mist);
}

.tag{
  display:inline-flex;
  align-items:center;
  padding:4px 10px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.05em;
  line-height:1.5;
  border:1px solid currentColor;
  border-radius:999px;
  color:var(--navy);
}
.tag--coral{ color:var(--rust); }
.tag--mint{
  background:var(--mint);
  border-color:var(--mint);
  color:var(--ink);
}

.breadcrumbs{
  background:var(--sand);
  border-bottom:1px solid var(--frame-line);
}
.breadcrumb-list{
  max-width:1480px;
  margin-inline:auto;
  padding:11px var(--gutter);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--brown);
}
.breadcrumb-list li{ display:inline-flex; align-items:center; gap:6px; }
.breadcrumb-list li:not(:last-child)::after{
  content:"/";
  color:var(--mist);
}
.breadcrumb-list a{
  border-bottom:1px solid rgba(11,42,74,.28);
  transition:color .2s var(--ease-out),border-color .2s var(--ease-out);
}
.breadcrumb-list a:hover{
  color:var(--rust);
  border-bottom-color:var(--rust);
}
.breadcrumb-list [aria-current="page"]{
  color:var(--navy);
  font-weight:700;
}

/* 图片容器基础规则 */
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--frame-line);
  border-radius:2px;
  aspect-ratio:16 / 10;
  background:
    linear-gradient(135deg,rgba(44,229,180,.18),rgba(242,100,60,.18)),
    var(--sand);
}
.media-frame > img,
.media-frame > picture,
.media-frame > picture > img,
.media-frame > video,
.media-frame > svg{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{ aspect-ratio:21 / 9; }
.media-frame--square{ aspect-ratio:1 / 1; }
.media-frame--portrait{ aspect-ratio:3 / 4; }
.media-frame__caption{
  position:absolute;
  inset:auto 0 0 0;
  padding:10px 12px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:var(--paper);
  background:linear-gradient(to top,rgba(7,26,43,.86),rgba(7,26,43,0));
}

/* 滚动进度 */
.scroll-progress{
  position:fixed;
  inset:0 auto auto 0;
  width:100%;
  height:3px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--coral),var(--mint));
  z-index:120;
  pointer-events:none;
}

/* 视口显现 */
html.js-ready .reveal{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .52s var(--ease-out),transform .52s var(--ease-out);
}
html.js-ready .reveal.is-visible{
  opacity:1;
  transform:none;
}

/* ============ 响应式 ============ */
@media (max-width:1040px){
  .site-header{ position:sticky; }
  .nav-toggle{ display:inline-flex; }
  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    margin:0;
    padding:10px var(--gutter) 26px;
    background:var(--ink);
    border-top:2px solid var(--coral);
    border-bottom:1px solid rgba(246,240,228,.18);
    clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),88% 100%,0 100%);
    max-height:calc(100vh - 90px);
    overflow-y:auto;
  }
  .site-nav[data-open]{ display:block; }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-item{ width:100%; }
  .nav-link{
    width:100%;
    padding:15px 2px;
    font-size:16px;
    border-bottom:1px dashed rgba(246,240,228,.18);
  }
  .nav-index{ font-size:11px; }
  .nav-label::after{ display:none; }
  .nav-foot-note{
    display:block;
    margin-top:16px;
    font-family:var(--font-mono);
    font-size:11.5px;
    letter-spacing:.1em;
    color:var(--mist);
  }
  .header-brand{ margin-right:auto; }
  .site-nav{ margin-inline:0; }
  .footer-grid{ grid-template-columns:1fr 1fr; }
  .footer-col:last-child{ grid-column:1 / -1; }
}

@media (max-width:780px){
  body{ font-size:16px; }
  .grid--2,.grid--3{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr; }
  .footer-col:last-child{ grid-column:auto; }
  .footer-copy{ margin-left:0; }
}

@media (max-width:620px){
  .header-frame{ gap:10px; min-height:62px; }
  .brand-tagline{ display:none; }
  .brand-name{ font-size:17px; }
  .brand-mark{ width:30px; height:30px; flex-basis:30px; }
  .header-actions .btn-primary{ padding:9px 13px; font-size:13px; }
  .nav-toggle{ padding:9px 11px; }
  .nav-toggle-label{ display:none; }
  .display-title{ font-size:clamp(26px,7vw,34px); }
  .contact-list li{ flex-direction:column; gap:2px; }
  .contact-key{ flex-basis:auto; padding-top:0; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html.js-ready .reveal{
    opacity:1;
    transform:none;
  }
  .btn-primary:hover{ transform:none; }
}