*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}
:root{
  --color-primary:#0A2E1F;
  --color-silver:#C0C4C8;
  --color-accent:#F25C05;
  --color-warmgray:#D8D2C4;
  --color-highlight:#F2C14E;
  --color-cream:#F5F2EB;
  --color-black:#0E0E0E;
  --color-iceblue:#E3E8F0;
  --font-heading:"Arial Black","DIN Alternate","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"Roboto Mono","Courier New","SF Mono",monospace;
  --font-body:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --sidebar-width:clamp(240px,24.5vw,296px);
  --header-h-mobile:56px;
  --content-max:1440px;
  --duration-fast:180ms;
  --duration-medium:320ms;
  --ease-out:cubic-bezier(0.22,1,0.36,1)
}
html{background-color:var(--color-black);scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  min-height:100vh;
  background-color:var(--color-black);
  background-image:
    repeating-linear-gradient(45deg,rgba(192,196,200,0.028) 0 1px,transparent 1px 14px),
    radial-gradient(circle at 78% 12%,rgba(10,46,31,0.55),transparent 46%);
  color:var(--color-warmgray);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  letter-spacing:0.02em;
  -webkit-font-smoothing:antialiased
}
h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:900;line-height:1.18;color:var(--color-cream);letter-spacing:0.01em}
h1{font-size:clamp(30px,4.6vw,48px)}
h2{font-size:clamp(22px,3vw,32px)}
h3{font-size:clamp(18px,2.2vw,22px)}
h4{font-size:17px}
p{margin-bottom:1em}
strong,b{color:var(--color-cream)}
em,i{font-style:italic}
a{color:var(--color-accent);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;transition:color var(--duration-fast)}
a:hover{color:var(--color-iceblue)}
ul,ol{padding-left:1.4em;margin-bottom:1em}
img,svg{display:block;max-width:100%}
button{font-family:inherit;font-size:inherit;color:inherit}
::selection{background:rgba(242,92,5,0.4);color:var(--color-cream)}
:focus-visible{outline:2px solid var(--color-accent);outline-offset:3px;border-radius:3px}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--color-black)}
::-webkit-scrollbar-thumb{background:rgba(192,196,200,0.32);border:2px solid var(--color-black);border-radius:6px}
::-webkit-scrollbar-thumb:hover{background:rgba(242,92,5,0.55)}
.visually-hidden{position:absolute !important;width:1px !important;height:1px !important;padding:0 !important;margin:-1px !important;overflow:hidden !important;clip:rect(0,0,0,0) !important;white-space:nowrap !important;border:0 !important}
#main-content{display:block;width:100%;min-height:60vh;padding:48px clamp(16px,3.6vw,48px) 96px;scroll-margin-top:64px}
#main-content:focus{outline:none}
.container{width:100%;max-width:1200px;margin-left:auto;margin-right:auto}
body[data-nav-lock]{overflow:hidden}
.skip-link{position:fixed;top:-100px;left:16px;z-index:9999;padding:10px 20px;background:var(--color-accent);color:var(--color-cream);font-family:var(--font-mono);font-size:13px;letter-spacing:0.08em;text-decoration:none;border-radius:4px;transition:top var(--duration-medium) var(--ease-out)}
.skip-link:focus-visible{top:16px;outline:2px solid var(--color-cream);outline-offset:2px}
.site-header{position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;z-index:100;display:flex;flex-direction:column;background-color:var(--color-primary);background-image:linear-gradient(180deg,rgba(14,14,14,0.22),transparent 32%),repeating-linear-gradient(135deg,rgba(192,196,200,0.04) 0 1px,transparent 1px 12px);border-right:1px solid rgba(192,196,200,0.3)}
.header-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:20px 16px 16px;border-bottom:1px solid rgba(192,196,200,0.24)}
.brand{display:flex;align-items:center;gap:10px;min-width:0;text-decoration:none;color:var(--color-cream)}
.brand:hover{color:var(--color-cream)}
.brand-mark{flex:0 0 auto;width:38px;height:45px;color:var(--color-silver)}
.brand-mark svg{width:100%;height:100%}
.brand-copy{display:flex;flex-direction:column;min-width:0}
.brand-name{font-family:var(--font-heading);font-size:17px;line-height:1.2;letter-spacing:0.02em;color:var(--color-cream);white-space:nowrap}
.brand-name em{font-style:normal;color:var(--color-accent)}
.brand-sub{display:block;margin-top:3px;font-family:var(--font-mono);font-size:8px;letter-spacing:0.2em;line-height:1;color:var(--color-silver);white-space:nowrap}
.brand-footer{color:var(--color-cream)}
.header-actions{display:flex;align-items:center;gap:6px}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;padding:0;background:transparent;border:1px solid rgba(192,196,200,0.35);border-radius:3px;color:var(--color-silver);cursor:pointer;transition:color var(--duration-fast),border-color var(--duration-fast),background-color var(--duration-fast)}
.icon-btn:hover{color:var(--color-accent);border-color:rgba(242,92,5,0.7);background-color:rgba(242,92,5,0.12)}
.icon-btn svg{width:18px;height:18px}
.nav-toggle{display:none;flex-direction:column;align-items:center;justify-content:center;gap:5px;width:42px;height:42px;padding:0;background:transparent;border:1px solid rgba(242,92,5,0.55);border-radius:3px;cursor:pointer;transition:border-color var(--duration-fast),background-color var(--duration-fast)}
.nav-toggle:hover{background-color:rgba(242,92,5,0.15)}
.nav-toggle-bar{display:block;width:20px;height:2px;border-radius:1px;background:var(--color-cream);transition:transform var(--duration-medium) var(--ease-out),opacity var(--duration-fast)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.site-nav{display:flex;flex-direction:column;flex:1;min-height:0;background:transparent}
.drawer-head{display:none}
.nav-scroll{flex:1;min-height:0;overflow-y:auto;padding:6px 0}
.nav-list{list-style:none;margin:0;padding:0;border-top:1px solid rgba(192,196,200,0.2)}
.nav-item{border-bottom:1px solid rgba(192,196,200,0.2)}
.nav-link{position:relative;display:flex;align-items:center;gap:12px;padding:14px 18px;font-family:var(--font-mono);font-size:13px;letter-spacing:0.14em;color:var(--color-silver);text-decoration:none;border-left:3px solid transparent;transition:color var(--duration-fast),background-color var(--duration-fast),border-color var(--duration-fast)}
.nav-link:hover{color:var(--color-cream);border-left-color:var(--color-accent);background:linear-gradient(90deg,rgba(242,92,5,0.12),transparent 70%)}
.nav-link[aria-current="page"]{color:var(--color-cream);border-left-color:var(--color-accent);background:linear-gradient(90deg,rgba(242,92,5,0.2),transparent 78%)}
.nav-link[aria-current="page"]::after{content:"";position:absolute;right:14px;top:50%;width:7px;height:7px;transform:translateY(-50%) rotate(45deg);background:var(--color-accent);box-shadow:0 0 10px rgba(242,92,5,0.8)}
.nav-index{min-width:22px;font-size:11px;color:var(--color-highlight);opacity:0.72;transition:opacity var(--duration-fast)}
.nav-link:hover .nav-index,.nav-link[aria-current="page"] .nav-index{opacity:1}
.nav-label{white-space:nowrap}
.nav-footer{padding:16px 18px 24px;border-top:1px solid rgba(192,196,200,0.22);background:rgba(14,14,14,0.35)}
.nav-footer-line{margin:0 0 5px;font-family:var(--font-mono);font-size:11px;letter-spacing:0.06em;color:var(--color-warmgray)}
.nav-footer-badge{display:inline-block;margin-top:10px;padding:4px 9px;font-family:var(--font-mono);font-size:10px;letter-spacing:0.12em;color:var(--color-highlight);border:1px solid rgba(242,193,78,0.5);border-radius:2px;background:rgba(242,193,78,0.1)}
.nav-backdrop{display:none}
.scroll-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:900;background:linear-gradient(90deg,var(--color-accent),var(--color-highlight));transform:scaleX(0);transform-origin:left center;pointer-events:none}
.back-top{display:none;position:fixed;right:22px;bottom:22px;z-index:850;align-items:center;justify-content:center;gap:5px;width:52px;height:52px;padding:0;background:rgba(14,14,14,0.92);border:1px solid rgba(242,92,5,0.7);border-radius:4px;color:var(--color-cream);cursor:pointer;box-shadow:0 8px 22px rgba(0,0,0,0.45);transition:background-color var(--duration-fast),border-color var(--duration-fast),transform var(--duration-fast)}
.back-top[data-visible]{display:flex}
.back-top:hover{background:rgba(242,92,5,0.25);border-color:var(--color-accent);transform:translateY(-2px)}
.back-top-arrow{font-family:var(--font-mono);font-size:16px;line-height:1;color:var(--color-accent)}
.back-top-text{display:block;font-family:var(--font-mono);font-size:8px;letter-spacing:0.16em}
.toast{position:fixed;left:50%;bottom:28px;z-index:950;max-width:min(440px,82vw);padding:12px 18px;background:var(--color-primary);border:1px solid rgba(242,92,5,0.6);border-radius:4px;box-shadow:0 12px 30px rgba(0,0,0,0.5);color:var(--color-cream);font-family:var(--font-mono);font-size:12px;letter-spacing:0.06em;text-align:center;opacity:0;visibility:hidden;transform:translate(-50%,12px);pointer-events:none;transition:opacity var(--duration-medium) var(--ease-out),transform var(--duration-medium) var(--ease-out),visibility 0s linear var(--duration-medium)}
.toast-show{opacity:1;visibility:visible;transform:translate(-50%,0);transition:opacity var(--duration-medium) var(--ease-out),transform var(--duration-medium) var(--ease-out),visibility 0s}
@media (max-width:1023.98px){
  .site-header{position:sticky;top:0;width:100%;height:auto;border-right:0;border-bottom:1px solid rgba(192,196,200,0.28)}
  .header-bar{height:var(--header-h-mobile);padding:0 12px 0 14px;border-bottom:0}
  .brand-mark{width:30px;height:36px}
  .brand-name{font-size:16px}
  .brand-sub{display:none}
  .icon-btn{width:32px;height:32px}
  .nav-toggle{display:flex;margin-left:2px}
  .site-nav{position:fixed;top:var(--header-h-mobile);left:0;bottom:0;width:min(340px,86vw);z-index:200;border-right:2px solid rgba(242,92,5,0.7);box-shadow:20px 0 50px rgba(0,0,0,0.55);background-color:var(--color-primary);background-image:repeating-linear-gradient(135deg,rgba(192,196,200,0.04) 0 1px,transparent 1px 12px);transform:translateX(-105%);visibility:hidden;transition:transform var(--duration-medium) var(--ease-out),visibility 0s linear var(--duration-medium)}
  .site-nav[data-open]{transform:translateX(0);visibility:visible;transition:transform var(--duration-medium) var(--ease-out),visibility 0s}
  .drawer-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid rgba(192,196,200,0.24)}
  .drawer-head-label{font-family:var(--font-mono);font-size:11px;letter-spacing:0.22em;color:var(--color-silver)}
  .drawer-close{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;padding:0;background:transparent;border:1px solid rgba(192,196,200,0.3);border-radius:3px;color:var(--color-silver);cursor:pointer;transition:color var(--duration-fast),border-color var(--duration-fast)}
  .drawer-close:hover{color:var(--color-accent);border-color:var(--color-accent)}
  .drawer-close svg{width:16px;height:16px}
  .nav-scroll{padding:4px 0}
  .nav-link{padding:13px 18px}
  .nav-footer{margin-top:auto}
  .nav-backdrop{position:fixed;top:var(--header-h-mobile);left:0;right:0;bottom:0;z-index:190;background:rgba(14,14,14,0.72);border:0;cursor:pointer}
  .site-nav[data-open] ~ .nav-backdrop{display:block}
  #main-content{padding-top:28px}
}
@media (min-width:1024px){
  body{margin-left:var(--sidebar-width)}
}
.site-footer{background-color:var(--color-black);background-image:repeating-linear-gradient(45deg,rgba(192,196,200,0.022) 0 1px,transparent 1px 12px);border-top:1px solid rgba(242,92,5,0.4);position:relative}
.site-footer::before{content:"";display:block;height:3px;width:min(260px,40%);background:linear-gradient(90deg,var(--color-accent),var(--color-highlight),transparent)}
.footer-top{display:grid;grid-template-columns:1.5fr 0.9fr 1.1fr 0.9fr;gap:clamp(24px,4vw,56px);max-width:var(--content-max);margin:0 auto;padding:52px clamp(20px,4vw,56px) 44px}
.footer-brand .brand{margin-bottom:18px}
.footer-trust{font-size:13px;line-height:1.8;color:var(--color-warmgray);max-width:40ch;margin-bottom:14px}
.footer-title{font-family:var(--font-mono);font-size:12px;font-weight:400;letter-spacing:0.2em;text-transform:uppercase;color:var(--color-silver);border-bottom:1px solid rgba(192,196,200,0.26);padding-bottom:10px;margin-bottom:16px}
.footer-links,.footer-contact{list-style:none;margin:0;padding:0}
.footer-links li,.footer-contact li{font-size:13px;line-height:1.55;padding:5px 0}
.footer-links a{display:inline-block;color:var(--color-warmgray);text-decoration:none;padding:2px 0;transition:color var(--duration-fast),transform var(--duration-fast)}
.footer-links a:hover{color:var(--color-iceblue);transform:translateX(4px)}
.footer-contact li{color:var(--color-warmgray);word-break:break-word}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;max-width:var(--content-max);margin:0 auto;padding:18px clamp(20px,4vw,56px) 22px;border-top:1px solid rgba(192,196,200,0.18);font-family:var(--font-mono);font-size:11px;letter-spacing:0.06em;color:var(--color-silver)}
.footer-bottom p{margin:0}
.footer-icp,.footer-service{color:var(--color-warmgray)}
@media (max-width:1023.98px){
  .footer-top{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .footer-top{grid-template-columns:1fr;padding-top:40px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;font-family:var(--font-mono);font-size:13px;letter-spacing:0.12em;text-transform:uppercase;text-decoration:none;border:1px solid var(--color-accent);border-radius:3px;background:transparent;color:var(--color-accent);cursor:pointer;line-height:1;white-space:nowrap;transition:background-color var(--duration-fast),color var(--duration-fast),box-shadow var(--duration-fast),border-color var(--duration-fast)}
.btn:hover,.btn:focus-visible{background:var(--color-accent);color:var(--color-cream);border-color:var(--color-accent);box-shadow:0 4px 18px rgba(242,92,5,0.35)}
.btn-primary{background:var(--color-accent);color:var(--color-cream)}
.btn-primary:hover,.btn-primary:focus-visible{background:transparent;color:var(--color-accent);box-shadow:0 4px 18px rgba(242,92,5,0.25)}
.btn-silver{border-color:var(--color-silver);color:var(--color-silver)}
.btn-silver:hover,.btn-silver:focus-visible{background:var(--color-silver);color:var(--color-black);box-shadow:0 4px 16px rgba(192,196,200,0.25)}
.btn-lg{padding:16px 30px;font-size:15px}
.btn-sm{padding:8px 14px;font-size:11px}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;padding:0 0 16px;margin-bottom:28px;list-style:none;font-family:var(--font-mono);font-size:12px;letter-spacing:0.08em;color:var(--color-silver);border-bottom:1px solid rgba(192,196,200,0.22)}
.breadcrumb a{color:var(--color-accent);text-decoration:none}
.breadcrumb a:hover{color:var(--color-iceblue);text-decoration:underline}
.breadcrumb-sep{color:rgba(192,196,200,0.45)}
.breadcrumb [aria-current="page"]{color:var(--color-cream)}
.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid-split{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(0,0.82fr);gap:clamp(16px,2.4vw,36px)}
@media (max-width:1023.98px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-split{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
}
.card{position:relative;padding:24px;background:linear-gradient(165deg,rgba(10,46,31,0.82),rgba(14,14,14,0.9));border:1px solid rgba(192,196,200,0.24);border-radius:4px;box-shadow:0 10px 28px rgba(0,0,0,0.35);transition:border-color var(--duration-fast),box-shadow var(--duration-fast),transform var(--duration-fast)}
.card:hover,.card:focus-within{border-color:rgba(242,92,5,0.65);box-shadow:0 16px 38px rgba(0,0,0,0.5),0 0 0 1px rgba(242,92,5,0.12);transform:translateY(-3px)}
.card-data{padding:22px;border-top:3px solid var(--color-accent)}
.card-title{font-family:var(--font-heading);font-size:18px;color:var(--color-cream);margin-bottom:10px}
.card-text{font-size:14px;line-height:1.7;color:var(--color-warmgray)}
.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:1px solid rgba(242,193,78,0.45);border-radius:2px;background:rgba(242,193,78,0.1);color:var(--color-highlight);font-family:var(--font-mono);font-size:11px;letter-spacing:0.1em}
.badge-accent{border-color:rgba(242,92,5,0.6);background:rgba(242,92,5,0.12);color:var(--color-accent)}
.tag{display:inline-block;padding:2px 8px;font-family:var(--font-mono);font-size:10px;letter-spacing:0.12em;color:var(--color-silver);border:1px solid rgba(192,196,200,0.3);border-radius:2px}
.section-head{display:flex;align-items:baseline;flex-wrap:wrap;gap:8px 16px;padding-bottom:12px;margin-bottom:24px;border-bottom:1px solid rgba(192,196,200,0.24)}
.section-index{font-family:var(--font-mono);font-size:12px;letter-spacing:0.2em;color:var(--color-accent)}
.section-title{margin:0;font-size:clamp(20px,2.6vw,30px)}
.section-sub{font-family:var(--font-mono);font-size:11px;letter-spacing:0.14em;text-transform:uppercase;color:var(--color-silver)}
.board{position:relative;margin:32px 0;padding:28px;border:1px solid rgba(192,196,200,0.28);border-radius:4px;background:linear-gradient(160deg,rgba(10,46,31,0.72),rgba(14,14,14,0.9))}
.board-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px 18px;padding-bottom:12px;margin-bottom:18px;border-bottom:1px solid rgba(192,196,200,0.22)}
.board-title{margin:0;font-size:20px}
.board-meta{font-family:var(--font-mono);font-size:11px;letter-spacing:0.14em;color:var(--color-accent)}
.board-evidence{margin:16px 0;padding:12px 16px;border-left:3px solid var(--color-accent);background:rgba(242,92,5,0.08);font-size:14px;line-height:1.7}
.board-terms{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 0;padding:0;list-style:none}
.board-term{padding:4px 10px;font-family:var(--font-mono);font-size:11px;letter-spacing:0.06em;color:var(--color-highlight);border:1px solid rgba(242,193,78,0.4);border-radius:2px;background:rgba(242,193,78,0.08)}
.board-extend{margin-top:16px;padding-top:14px;border-top:1px dashed rgba(192,196,200,0.26);font-size:13px}
.figure{position:relative;display:block;margin:0 0 24px;overflow:hidden;border:1px solid rgba(192,196,200,0.22);background:rgba(192,196,200,0.05);border-radius:3px}
.figure::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(45deg,rgba(192,196,200,0.045) 0 2px,transparent 2px 14px);pointer-events:none}
.figure-lg{aspect-ratio:21 / 9}
.figure-md{aspect-ratio:16 / 9}
.figure-sm{aspect-ratio:4 / 3}
.figure img{display:block;width:100%;height:100%;object-fit:cover}
.figcaption{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:8px 0 0;font-family:var(--font-mono);font-size:11px;letter-spacing:0.06em;color:var(--color-silver)}
.figcaption .figure-legend{color:var(--color-warmgray)}
.data-table{width:100%;border-collapse:collapse;font-size:14px;margin-bottom:24px}
.data-table caption{font-family:var(--font-mono);font-size:11px;letter-spacing:0.14em;text-align:left;color:var(--color-silver);padding-bottom:8px}
.data-table th,.data-table td{border:1px solid rgba(192,196,200,0.2);padding:10px 14px;text-align:left;vertical-align:top}
.data-table th{font-family:var(--font-mono);font-size:12px;font-weight:400;letter-spacing:0.1em;text-transform:uppercase;color:var(--color-cream);background:rgba(10,46,31,0.72)}
.data-table tbody tr:nth-child(even) td{background:rgba(192,196,200,0.045)}
.data-table td{color:var(--color-warmgray)}
.data-number{font-family:var(--font-mono);font-size:clamp(34px,5vw,52px);font-weight:700;line-height:1;letter-spacing:-0.03em;color:var(--color-accent)}
.data-label{display:block;margin-top:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:0.18em;text-transform:uppercase;color:var(--color-silver)}
.clip-slash{clip-path:polygon(0 0,100% 0,calc(100% - 28px) 100%,0 100%)}
.clip-slash-reverse{clip-path:polygon(28px 0,100% 0,100% 100%,0 100%)}
.text-large{font-size:18px}
.text-small{font-size:13px}
.text-muted{color:var(--color-warmgray)}
.text-cream{color:var(--color-cream)}
.text-accent{color:var(--color-accent)}
.lead{font-size:18px;line-height:1.75;color:var(--color-warmgray)}
.page-title{font-family:var(--font-heading);font-size:clamp(30px,4.6vw,48px);line-height:1.1;color:var(--color-cream);margin-bottom:12px;letter-spacing:-0.01em}
.page-subtitle{font-family:var(--font-mono);font-size:13px;letter-spacing:0.16em;text-transform:uppercase;color:var(--color-accent);margin-bottom:24px}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*:before,*:after{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important;transition-delay:0s !important}
  .card:hover,.card:focus-within,.back-top:hover{transform:none}
}