*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--ink-900);color:var(--paper);font-family:var(--font-body);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg,video{display:block;max-width:100%}
h1,h2,h3,h4,p,ul,ol,figure,blockquote,dl{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

:root{
--ink-900:#061226;
--ink-800:#0B1F3A;
--ink-700:#12345A;
--ink-600:#1E3A5F;
--paper:#F4EFE4;
--paper-light:#FBF7EE;
--cyan:#00E5CC;
--cyan-soft:#BFF7F2;
--amber:#FF8A3D;
--red:#FF5B6E;
--line:rgba(191,247,242,.16);
--line-strong:rgba(0,229,204,.42);
--font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
--font-body:"Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
--font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
--font-editorial:"Songti SC","SimSun","Source Han Serif SC",Georgia,serif;
--wrap:1200px;
--wrap-narrow:760px;
--gutter:clamp(16px,4vw,40px);
--radius:3px;
}

body{
background:
radial-gradient(circle at 82% -10%,rgba(0,229,204,.12),transparent 46%),
radial-gradient(circle at 8% 6%,rgba(255,138,61,.09),transparent 42%),
var(--ink-900);
}

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

h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.22;letter-spacing:.06em}
h1{font-size:clamp(2rem,4.8vw,3.4rem)}
h2{font-size:clamp(1.45rem,2.9vw,2.1rem)}
h3{font-size:clamp(1.12rem,1.9vw,1.4rem)}
h4{font-size:1.02rem;letter-spacing:.1em}

.mono{font-family:var(--font-mono);letter-spacing:.06em}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.display-serif{font-family:var(--font-editorial);letter-spacing:.02em}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.wrap--narrow{max-width:var(--wrap-narrow)}
.section{padding-block:clamp(40px,7vw,88px)}
.section--paper{background:var(--paper);color:var(--ink-900)}
.section--paper h1,.section--paper h2,.section--paper h3{color:var(--ink-800)}
.rule{height:1px;background:var(--line);border:0}

.label{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan)}
.label::before{content:"";width:18px;height:1px;background:currentColor;flex:0 0 auto}
.tag{display:inline-block;padding:3px 9px;border:1px solid rgba(191,247,242,.34);border-radius:2px;background:rgba(0,229,204,.09);color:var(--cyan-soft);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em}
.tag--amber{border-color:rgba(255,138,61,.5);background:rgba(255,138,61,.12);color:#FFC79E}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border:1px solid transparent;border-radius:var(--radius);font-family:var(--font-body);font-size:14px;font-weight:600;letter-spacing:.07em;line-height:1.2;transition:transform .18s ease,background .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--amber);color:#1A0D02}
.btn--primary:hover{background:#FFA467;box-shadow:0 10px 24px -14px rgba(255,138,61,.95)}
.btn--cyan{background:var(--cyan);color:var(--ink-900)}
.btn--cyan:hover{background:#63F3E4}
.btn--ghost{background:transparent;border-color:rgba(191,247,242,.34);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(0,229,204,.08)}
.btn--sm{padding:7px 13px;font-size:12.5px;letter-spacing:.09em}
.btn--block{width:100%}

.panel{position:relative;padding:clamp(18px,3vw,28px);background:linear-gradient(160deg,var(--ink-800),var(--ink-900));border:1px solid var(--line);border-radius:var(--radius)}
.panel--paper{background:var(--paper);color:var(--ink-900);border-color:rgba(11,31,58,.16)}
.panel--cyan{border-color:var(--line-strong);box-shadow:0 0 40px -22px rgba(0,229,204,.9)}
.panel__label{display:block;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;color:var(--cyan);margin-bottom:10px}
.panel--paper .panel__label{color:var(--ink-700)}
.panel__title{font-size:1.05rem;letter-spacing:.08em;margin-bottom:8px}

.prose{max-width:68ch;font-size:17px;line-height:1.78;color:rgba(244,239,228,.87)}
.prose>*+*{margin-top:1.05em}
.prose h2,.prose h3{color:var(--paper)}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.prose ul{display:flex;flex-direction:column;gap:.5em}
.prose ul>li{position:relative;padding-inline-start:18px}
.prose ul>li::before{content:"";position:absolute;left:0;top:.72em;width:9px;height:1px;background:var(--cyan)}
.prose blockquote{border-inline-start:2px solid var(--amber);padding-inline-start:16px;font-family:var(--font-editorial);font-size:1.06rem;color:var(--cyan-soft)}
.prose--paper{color:rgba(6,18,38,.87)}
.prose--paper h2,.prose--paper h3{color:var(--ink-800)}
.prose--paper a{color:var(--ink-700)}
.prose--paper blockquote{color:var(--ink-700)}

.grid{display:grid;gap:clamp(16px,2.5vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--aside{grid-template-columns:minmax(0,2fr) minmax(240px,1fr)}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

.breadcrumb{border-bottom:1px solid var(--line);padding-block:12px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:rgba(244,239,228,.55)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__link{color:rgba(191,247,242,.82);transition:color .18s ease}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__sep{color:rgba(191,247,242,.34)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

.media{position:relative;overflow:hidden;aspect-ratio:16/10;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(135deg,var(--ink-600),var(--ink-800) 58%,var(--ink-900))}
.media>img,.media>picture>img{width:100%;height:100%;object-fit:cover}
.media::after{content:"";position:absolute;inset:0;pointer-events:none;opacity:.55;background-image:linear-gradient(rgba(0,229,204,.16) 1px,transparent 1px),linear-gradient(90deg,rgba(0,229,204,.16) 1px,transparent 1px);background-size:34px 34px;mix-blend-mode:screen}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--portrait{aspect-ratio:3/4}
.media--paper{border-color:rgba(11,31,58,.16);background:linear-gradient(135deg,#E7DFCE,#F4EFE4)}
.media__caption{margin-top:.6rem;font-size:12.5px;letter-spacing:.05em;color:var(--cyan-soft);opacity:.82}

.skip-link{position:absolute;left:12px;top:-64px;z-index:120;padding:10px 16px;border-radius:2px;background:var(--cyan);color:var(--ink-900);font-size:13px;font-weight:700;letter-spacing:.08em;transition:top .18s ease}
.skip-link:focus{top:12px}

.scroll-progress{position:fixed;inset-block-start:0;inset-inline:0;height:2px;z-index:80;pointer-events:none;background:rgba(191,247,242,.1)}
.scroll-progress__bar{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--cyan),var(--amber))}

.index-rail{position:fixed;left:0;top:50%;transform:translateY(-50%);z-index:70;display:flex;flex-direction:column;align-items:center;gap:8px;padding:16px 7px;background:var(--cyan);color:var(--ink-900);border-radius:0 3px 3px 0;box-shadow:0 0 30px -12px rgba(0,229,204,.95);transition:padding .2s ease,box-shadow .2s ease}
.index-rail:hover{padding-inline-end:13px;box-shadow:0 0 34px -6px rgba(0,229,204,1)}
.index-rail__num{font-family:var(--font-mono);font-weight:700;font-size:13px;letter-spacing:.02em}
.index-rail__label{writing-mode:vertical-rl;font-size:11.5px;font-weight:600;letter-spacing:.32em}

.site-header{position:sticky;top:0;z-index:60;background:linear-gradient(180deg,rgba(11,31,58,.98),rgba(6,18,38,.99));border-bottom:1px solid var(--line-strong);transition:box-shadow .2s ease}
.site-header[data-scrolled]{box-shadow:0 18px 36px -26px rgba(0,0,0,.95)}
.site-header__inner{display:flex;align-items:center;gap:clamp(10px,2vw,22px);min-height:66px;padding-block:10px}

.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand__mark{display:grid;place-items:center;width:34px;height:34px;border-radius:2px;background:var(--cyan);color:var(--ink-900);font-family:var(--font-mono);font-weight:700;font-size:18px;box-shadow:0 0 22px -6px rgba(0,229,204,.95)}
.brand__type{display:flex;flex-direction:column;line-height:1.16}
.brand__name{font-family:var(--font-display);font-weight:700;font-size:15px;letter-spacing:.14em;color:var(--paper)}
.brand__tagline{font-size:11px;letter-spacing:.07em;color:var(--cyan-soft);opacity:.76}

.header-hint{display:inline-flex;align-items:center;gap:8px;margin-inline-start:auto;padding:5px 12px;border:1px solid var(--line-strong);border-radius:999px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--cyan-soft);white-space:nowrap;background:rgba(0,229,204,.06)}
.header-hint__dot{width:6px;height:6px;border-radius:50%;background:var(--cyan);animation:hintPulse 2.6s ease-out infinite}
.header-actions{display:flex;align-items:center;gap:8px;margin-inline-start:auto}

.nav-toggle{display:none;align-items:center;gap:9px;min-height:40px;padding:8px 12px;border:1px solid rgba(191,247,242,.3);border-radius:2px;color:var(--paper);font-size:12px;letter-spacing:.16em;transition:border-color .18s ease,color .18s ease}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;background:var(--cyan);transition:background .2s ease}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--cyan);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)}
.nav-toggle__text{font-family:var(--font-mono)}

.primary-nav{display:block;border-top:1px solid rgba(191,247,242,.09)}
.primary-nav__inner{display:flex;align-items:center;gap:18px;padding-bottom:8px}
.primary-nav__list{display:flex;flex-wrap:wrap;gap:2px}
.primary-nav__item{display:block}
.primary-nav__link{position:relative;display:inline-flex;align-items:baseline;gap:7px;padding:8px 12px;border-radius:2px;font-size:13.5px;letter-spacing:.05em;color:rgba(244,239,228,.78);transition:color .18s ease,background .18s ease}
.primary-nav__label{white-space:nowrap}
.primary-nav__idx{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;color:rgba(191,247,242,.58)}
.primary-nav__link::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:1px;background:var(--amber);transform:scaleX(0);transform-origin:left;transition:transform .2s ease}
.primary-nav__link:hover{color:var(--paper);background:rgba(0,229,204,.09)}
.primary-nav__link:hover::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{background:var(--cyan);color:var(--ink-900)}
.primary-nav__link[aria-current="page"] .primary-nav__idx{color:rgba(6,18,38,.68)}
.primary-nav__link[aria-current="page"]::after{display:none}
.primary-nav__status{margin-inline-start:auto;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--amber);white-space:nowrap}

.site-footer{position:relative;background:linear-gradient(180deg,#061226,#04101F 68%,#061226);border-top:1px solid var(--line-strong);padding-top:clamp(34px,6vw,62px);color:var(--paper);overflow:hidden}
.site-footer::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(0,229,204,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(0,229,204,.07) 1px,transparent 1px);background-size:52px 52px;-webkit-mask-image:linear-gradient(180deg,#000,transparent 64%);mask-image:linear-gradient(180deg,#000,transparent 64%)}
.site-footer__grid{position:relative;display:grid;grid-template-columns:minmax(230px,1.6fr) repeat(3,minmax(110px,1fr));gap:clamp(20px,3.6vw,44px);padding-bottom:clamp(26px,4vw,44px)}
.footer-brand{display:flex;flex-direction:column;gap:14px}
.brand--footer .brand__mark{background:transparent;color:var(--cyan);box-shadow:inset 0 0 0 1px rgba(0,229,204,.6)}
.brand--footer .brand__name{font-size:14.5px}
.footer-brand__desc{max-width:36ch;font-size:14px;line-height:1.72;color:rgba(244,239,228,.72)}
.footer-actions{display:flex;flex-wrap:wrap;gap:8px}
.footer-col__heading{font-family:var(--font-mono);font-size:11.5px;font-weight:500;letter-spacing:.2em;color:var(--cyan);margin-bottom:14px}
.footer-col__list{display:flex;flex-direction:column;gap:10px}
.footer-col__link{display:inline-block;font-size:14px;color:rgba(244,239,228,.78);transition:color .18s ease,padding-inline-start .18s ease}
.footer-col__link:hover,.footer-col__link:focus-visible{color:var(--cyan);padding-inline-start:8px}
.footer-contact{grid-column:1/-1;display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px 30px;padding-top:22px;border-top:1px dashed rgba(191,247,242,.22)}
.footer-contact__item{font-size:13.5px;line-height:1.6;color:rgba(244,239,228,.7)}
.footer-contact__key{display:block;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;color:var(--cyan-soft);opacity:.78;margin-bottom:5px}
.footer-contact__value{color:var(--paper);font-size:14px;word-break:break-word}
.footer-contact__note{grid-column:1/-1;font-size:12.5px;line-height:1.65;color:rgba(244,239,228,.55)}
.site-footer__base{position:relative;display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;padding-block:18px 22px;border-top:1px solid rgba(191,247,242,.14);font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;color:rgba(244,239,228,.6)}
.footer-copy{margin:0}
.footer-icp{margin:0;color:rgba(191,247,242,.68)}
.footer-base__links{display:flex;flex-wrap:wrap;gap:16px;margin-inline-start:auto}
.footer-base__link{color:rgba(244,239,228,.66);transition:color .18s ease}
.footer-base__link:hover,.footer-base__link:focus-visible{color:var(--cyan)}

@keyframes hintPulse{
0%{box-shadow:0 0 0 0 rgba(0,229,204,.8)}
70%{box-shadow:0 0 0 7px rgba(0,229,204,0)}
100%{box-shadow:0 0 0 0 rgba(0,229,204,0)}
}
@keyframes navIn{
from{opacity:0;transform:translateY(-6px)}
to{opacity:1;transform:none}
}

@media (max-width:1100px){
.index-rail{display:none}
}
@media (max-width:900px){
.nav-toggle{display:inline-flex}
.header-hint{display:none}
.site-header__inner{min-height:60px}
.primary-nav{display:none;border-top:1px solid var(--line);background:#050F1F}
.primary-nav[data-open]{display:block;animation:navIn .22s ease-out both}
.primary-nav__inner{flex-direction:column;align-items:stretch;padding-block:8px 16px}
.primary-nav__list{flex-direction:column;gap:0}
.primary-nav__link{width:100%;justify-content:flex-start;padding:13px 10px;border-bottom:1px solid rgba(191,247,242,.1);border-radius:0;font-size:15px}
.primary-nav__link::after{display:none}
.primary-nav__status{margin-inline-start:0;padding-top:12px}
.header-actions .btn--ghost{display:none}
.grid--2,.grid--3,.grid--aside{grid-template-columns:1fr}
.site-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.footer-brand{grid-column:1/-1}
}
@media (max-width:640px){
body{font-size:16px}
.brand__tagline{display:none}
.brand__mark{width:30px;height:30px;font-size:16px}
.brand__name{font-size:13.5px;letter-spacing:.1em}
.header-actions .btn{padding:7px 10px;font-size:11.5px;letter-spacing:.04em}
.nav-toggle{padding:7px 10px;gap:7px}
.nav-toggle__text{display:none}
.site-footer__grid{grid-template-columns:1fr;gap:26px}
.footer-contact{grid-template-columns:1fr}
.footer-base__links{margin-inline-start:0;width:100%}
}
@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}
}