/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:132px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,picture,video{display:block;max-width:100%}
button{background:none;border:0;font:inherit;color:inherit;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ===== tokens ===== */
:root{
  --ink-night:#0B0713;
  --panel-deep:#150E24;
  --cream:#F4E9D8;
  --dark-brown:#231636;
  --mist:#A7AECB;
  --neon-purple:#B44CFF;
  --neon-cyan:#35E6E0;
  --warm-orange:#FF8A3D;
  --alert-magenta:#FF3D6E;
  --cream-grey:#E4DED2;
  --hairline:#2A1C46;
  --font-display:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --edge:3px;
  --shadow-hard:8px 8px 0 var(--dark-brown);
  --shadow-soft:6px 6px 0 rgba(180,76,255,.55);
  --wrap:1180px;
}

/* ===== base ===== */
body{
  min-height:100vh;
  background-color:var(--ink-night);
  background-image:
    radial-gradient(680px 420px at 12% -6%, rgba(180,76,255,.20), transparent 70%),
    radial-gradient(620px 380px at 96% 6%, rgba(53,230,224,.14), transparent 72%),
    radial-gradient(520px 340px at 58% 106%, rgba(255,138,61,.12), transparent 70%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.014) 0 1px, transparent 1px 4px);
  background-attachment:fixed;
  background-repeat:no-repeat;
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.22;color:var(--cream);letter-spacing:-.01em}
h1{font-size:clamp(40px,7vw,76px);line-height:1.05;letter-spacing:-.02em}
h2{font-size:clamp(28px,3.6vw,40px)}
h3{font-size:clamp(20px,2.2vw,26px);font-weight:800}
h4{font-size:18px;font-weight:800}
p{max-width:68ch}
strong,b{font-weight:800}
::selection{background:var(--neon-purple);color:#160726}
:focus-visible{outline:2px solid var(--neon-purple);outline-offset:2px}

/* ===== layout ===== */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}
.section{padding:56px 0}
.section--wide{padding:72px 0}
.section--slim{padding:28px 0}
.section+.section{border-top:1px solid var(--hairline)}
.section__head{display:flex;flex-direction:column;gap:10px;margin-bottom:28px;max-width:64ch}
.stack{display:grid;gap:16px}
.split{display:grid;gap:32px;grid-template-columns:minmax(0,58fr) minmax(0,42fr);align-items:start}
.grid-auto{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* ===== surfaces ===== */
.panel{background:var(--panel-deep);border:1px solid var(--hairline);padding:24px}
.card{
  display:flex;flex-direction:column;gap:10px;
  background:var(--cream);color:#1D1230;
  border:var(--edge) solid var(--dark-brown);
  box-shadow:var(--shadow-hard);
  padding:20px;
  transition:transform .18s ease, box-shadow .18s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:12px 14px 0 var(--dark-brown)}
.card__title{font-family:var(--font-display);font-size:20px;font-weight:900;line-height:1.3;color:#160C24}
.card__meta{font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;color:#5A4A6E}
.card--dark{background:var(--panel-deep);color:var(--cream);border-color:var(--neon-purple);box-shadow:12px 12px 0 rgba(11,7,19,.8)}
.card--dark .card__title{color:var(--cream)}
.card--dark .card__meta{color:var(--neon-cyan)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:13px;letter-spacing:.12em;color:var(--neon-purple);text-transform:uppercase}
.tag,.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:2px solid currentColor;border-radius:2px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;line-height:1.6}
.tag{color:var(--neon-cyan)}
.stat{display:grid;gap:4px}
.stat__value{font-family:var(--font-mono);font-size:clamp(28px,4vw,44px);font-weight:800;letter-spacing:.02em;color:var(--neon-cyan);line-height:1.1}
.stat__label{font-size:14px;letter-spacing:.5px;color:var(--mist)}
.rule-cut{height:6px;border:0;background:linear-gradient(90deg,var(--neon-purple),var(--neon-cyan) 52%,var(--warm-orange));clip-path:polygon(0 0,100% 0,calc(100% - 18px) 100%,0 100%)}
.divider-dots{height:14px;color:rgba(167,174,203,.5);background-image:radial-gradient(currentColor 1.5px, transparent 1.5px);background-size:14px 14px;background-repeat:repeat-x}
.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}

/* ===== text helpers ===== */
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.link-underline{color:var(--neon-purple);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:2px}
.link-underline:hover{color:var(--neon-cyan)}

/* ===== buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 20px;
  font-family:var(--font-display);font-size:14px;font-weight:800;letter-spacing:.5px;
  border:var(--edge) solid var(--dark-brown);border-radius:2px;
  background:var(--cream);color:#1A1026;
  box-shadow:var(--shadow-hard);
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:10px 10px 0 var(--dark-brown)}
.btn:active{transform:translate(2px,2px);box-shadow:3px 3px 0 var(--dark-brown)}
.btn--primary{background:var(--warm-orange);color:#24102C}
.btn--ghost{background:transparent;color:var(--cream);border-color:var(--neon-purple)}
.btn--ghost:hover{background:var(--neon-purple);color:#160726}

/* ===== breadcrumbs ===== */
.breadcrumbs{font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;color:var(--mist)}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:4px}
.breadcrumbs__item{display:flex;align-items:center}
.breadcrumbs__item+.breadcrumbs__item::before{content:"／";margin:0 8px;color:#5A4A6E}
.breadcrumbs__link{color:var(--mist);min-height:44px;display:inline-flex;align-items:center}
.breadcrumbs__link:hover{color:var(--neon-purple);text-decoration:underline;text-underline-offset:3px}
.breadcrumbs__item[aria-current="page"]{color:var(--cream)}

/* ===== prose ===== */
.prose{max-width:68ch;font-size:17px;line-height:1.8;color:var(--cream)}
.prose p+p{margin-top:14px}
.prose h2{font-size:clamp(24px,3vw,32px);margin-top:40px}
.prose h3{margin-top:28px}
.prose h4{margin-top:22px}
.prose ul,.prose ol{margin-top:14px;display:grid;gap:8px}
.prose li{position:relative;padding-left:22px}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:8px;background:var(--neon-cyan)}
.prose a{color:var(--neon-purple);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--neon-cyan)}
.prose blockquote{margin-top:20px;padding:14px 18px;background:var(--panel-deep);border-left:6px solid var(--warm-orange);color:var(--cream-grey)}

/* ===== media frames ===== */
.frame-media{
  position:relative;overflow:hidden;
  background:var(--panel-deep);
  border:var(--edge) solid var(--dark-brown);
  box-shadow:var(--shadow-hard);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 24px),calc(100% - 24px) 100%,0 100%);
}
.frame-media__media{
  display:block;width:100%;aspect-ratio:16/10;object-fit:cover;
  background:linear-gradient(135deg,#2C1546,#141024 58%,#0B0713);
}
.frame-media--wide .frame-media__media{aspect-ratio:21/9}
.frame-media--tall .frame-media__media{aspect-ratio:4/5}
.frame-media__caption{
  position:absolute;left:0;bottom:0;max-width:calc(100% - 24px);
  padding:6px 12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  background:rgba(11,7,19,.88);color:var(--neon-cyan);
  border-top:2px solid var(--neon-purple);
}

/* ===== skip link ===== */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:120;
  transform:translateY(-180%);
  padding:10px 16px;
  background:var(--neon-cyan);color:#12061F;
  font-family:var(--font-display);font-size:14px;font-weight:800;letter-spacing:.5px;
  border:var(--edge) solid var(--dark-brown);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ===== header ===== */
.site-header{position:sticky;top:0;z-index:60}
.brand-bar{background:var(--panel-deep);border-bottom:1px solid var(--hairline)}
.brand-bar__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 20px}
.brand-mark{display:flex;align-items:center;gap:12px;min-height:44px}
.brand-mark__glyph{
  display:grid;place-items:center;flex:0 0 auto;
  width:38px;height:38px;
  background:linear-gradient(135deg,var(--neon-purple),var(--alert-magenta));
  color:#140522;font-family:var(--font-mono);font-weight:800;font-size:19px;
  border:2px solid #0B0713;
  box-shadow:3px 3px 0 rgba(53,230,224,.75);
}
.brand-mark__text{display:flex;flex-direction:column;gap:2px}
.brand-mark__name{display:block;font-family:var(--font-display);font-size:18px;font-weight:900;line-height:1.2;letter-spacing:.02em;color:var(--cream)}
.brand-mark__tag{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--neon-cyan)}
.brand-mark:hover .brand-mark__name{color:var(--neon-purple)}
.utility-list{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.utility-list__item{display:flex;align-items:center}
.chip--lang{color:var(--neon-cyan)}
.utility-link{
  display:inline-flex;align-items:center;min-height:40px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.03em;color:var(--mist);
  border-bottom:1px dashed transparent;
  transition:color .18s ease,border-color .18s ease;
}
.utility-link:hover{color:var(--neon-purple);border-bottom-color:var(--neon-purple)}

.nav-bar{background:#0F0A1B;border-bottom:var(--edge) solid var(--dark-brown)}
.nav-bar__inner{display:flex;align-items:center;gap:16px;padding:8px 20px}
.primary-nav{flex:1 1 auto;min-width:0}
.primary-nav__list{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.primary-nav__item{display:block}
.primary-nav__link{
  display:inline-flex;align-items:center;min-height:44px;padding:8px 14px;
  font-family:var(--font-display);font-size:15px;font-weight:700;letter-spacing:.02em;
  color:var(--mist);border:2px solid transparent;border-radius:2px;
  transition:color .18s ease,background .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.primary-nav__link:hover{color:var(--cream);border-color:var(--neon-purple)}
.primary-nav__link[aria-current="page"]{
  background:var(--neon-purple);color:#150725;border-color:var(--neon-purple);
  box-shadow:3px 3px 0 rgba(53,230,224,.6);
}
.nav-bar__cta{flex:0 0 auto;color:#24102C;box-shadow:4px 4px 0 rgba(180,76,255,.85)}
.nav-bar__cta:hover{box-shadow:7px 7px 0 rgba(180,76,255,.9)}
.nav-toggle{
  display:none;align-items:center;gap:10px;
  min-height:44px;padding:8px 14px;
  background:var(--panel-deep);color:var(--cream);
  font-family:var(--font-display);font-size:14px;font-weight:800;letter-spacing:.5px;
  border:var(--edge) solid var(--neon-purple);border-radius:2px;
}
.nav-toggle__bars{position:relative;display:block;width:20px;height:2px;background:var(--cream)}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:20px;height:2px;background:var(--cream);transition:transform .18s ease}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle__label{display:inline}
.site-header[data-open="true"] .nav-toggle__bars{background:transparent}
.site-header[data-open="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}
.scroll-meter{
  position:absolute;left:0;right:0;bottom:0;height:3px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--neon-purple),var(--neon-cyan) 55%,var(--warm-orange));
  pointer-events:none;
}

/* ===== footer ===== */
.site-footer{position:relative;background:var(--panel-deep);border-top:1px solid var(--hairline);color:var(--mist)}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--neon-purple),var(--neon-cyan) 55%,var(--warm-orange))}
.site-footer__top{padding:52px 0 36px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px;align-items:start}
.footer-brand{display:flex;flex-direction:column;gap:14px;max-width:40ch}
.footer-brand__name{font-family:var(--font-display);font-size:22px;font-weight:900;letter-spacing:.02em;color:var(--cream);max-width:none}
.footer-brand__line{font-size:15px;line-height:1.7;color:var(--mist);max-width:38ch}
.footer-contact{display:flex;flex-direction:column;gap:8px;font-family:var(--font-mono);font-size:13px;letter-spacing:.03em;color:var(--cream-grey)}
.footer-contact__item{display:flex;gap:10px;align-items:flex-start;max-width:none}
.footer-contact__key{flex:0 0 auto;color:var(--neon-cyan)}
.footer-contact__link{color:var(--cream);border-bottom:1px dashed rgba(53,230,224,.5)}
.footer-contact__link:hover{color:var(--neon-cyan);border-bottom-style:solid}
.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-col__title{font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--neon-cyan);text-transform:uppercase;max-width:none}
.footer-col__list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-flex;align-items:center;min-height:44px;padding:2px 0;
  font-size:15px;color:var(--mist);
  transition:color .18s ease,transform .18s ease;
}
.footer-link::before{content:"▸";margin-right:8px;font-family:var(--font-mono);font-size:11px;color:var(--warm-orange);opacity:.85}
.footer-link:hover{color:var(--neon-purple);transform:translateX(4px)}
.site-footer__legal{border-top:1px solid var(--hairline);padding:20px 0 28px}
.footer-legal__meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px 20px;font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;color:var(--mist);max-width:none}
.legal-line{display:inline-flex;align-items:center;gap:8px}
.footer-legal__note{margin-top:10px;font-size:13px;line-height:1.7;color:#7C86A8;max-width:76ch}

/* ===== back to top ===== */
.to-top{
  position:fixed;right:18px;bottom:22px;z-index:55;
  display:inline-flex;align-items:center;gap:8px;
  min-height:44px;padding:10px 16px;
  background:var(--neon-purple);color:#160726;
  font-family:var(--font-display);font-size:14px;font-weight:900;letter-spacing:.5px;
  border:var(--edge) solid var(--dark-brown);border-radius:2px;
  box-shadow:5px 5px 0 rgba(11,7,19,.75);
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease,background .18s ease;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--neon-cyan)}

/* ===== tablet ===== */
@media (max-width:900px){
  html{scroll-padding-top:120px}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;top:0;right:0;z-index:70;
    width:min(86vw,360px);height:100vh;
    padding:92px 18px 32px;
    background:var(--panel-deep);border-left:var(--edge) solid var(--neon-purple);
    overflow-y:auto;
    transform:translateX(103%);visibility:hidden;
    transition:transform .2s ease,visibility .2s ease;
  }
  .site-header[data-open="true"] .primary-nav{transform:translateX(0);visibility:visible;box-shadow:-10px 0 0 rgba(180,76,255,.28)}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:8px}
  .primary-nav__link{display:flex;justify-content:space-between;font-size:17px;padding:12px 14px;border-color:var(--hairline)}
  .primary-nav__link::after{content:"›";font-family:var(--font-mono);color:var(--neon-cyan)}
  .primary-nav__link[aria-current="page"]::after{color:#150725}
  html[data-nav-open="true"]{overflow:hidden}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1/-1}
  .split{grid-template-columns:1fr}
  .section{padding:44px 0}
  .section--wide{padding:56px 0}
}

/* ===== phone ===== */
@media (max-width:560px){
  .brand-bar__inner{padding:10px 16px;gap:10px}
  .nav-bar__inner{padding:8px 16px;gap:10px}
  .utility-list{gap:8px}
  .brand-mark__tag{display:none}
  .nav-bar__cta{padding:8px 12px;font-size:13px;letter-spacing:.2px}
  .footer-grid{grid-template-columns:1fr}
  .to-top{right:12px;bottom:14px;padding:8px 14px}
  .frame-media__media{aspect-ratio:4/3}
}
@media (max-width:380px){
  .nav-bar__cta{display:none}
}

/* ===== reduced motion ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .card:hover{transform:none;box-shadow:var(--shadow-hard)}
  .btn:hover{transform:none;box-shadow:var(--shadow-hard)}
  .footer-link:hover{transform:none}
  .to-top{transition:none}
}