/* ===== 1. reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--header-h) + 24px)}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid #2FF3D0;outline-offset:3px;border-radius:2px}

/* ===== 2. tokens ===== */
:root{
  --ink-950:#05070F;
  --ink-900:#0A1024;
  --panel-800:#111B36;
  --line:#1E3A5F;
  --cyan:#2FF3D0;
  --blue:#4C8DFF;
  --orange:#FF5A1F;
  --amber:#FFC24B;
  --text:#EAF2FF;
  --text-2:#93A4C4;
  --text-3:#5A6B8C;
  --grad-field:linear-gradient(90deg,#2FF3D0,#4C8DFF 55%,#FF5A1F);
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --shell:1280px;
  --read:720px;
  --header-h:126px;
  --radius:4px;
  --ease:cubic-bezier(.22,.7,.24,1);
}

/* ===== 3. base ===== */
body{
  min-height:100vh;
  padding-top:var(--header-h);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background-color:var(--ink-950);
  background-image:
    radial-gradient(900px 520px at 84% -6%, rgba(76,141,255,.18), transparent 62%),
    radial-gradient(720px 460px at 6% 0%, rgba(47,243,208,.10), transparent 58%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    linear-gradient(rgba(30,58,95,.6) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,58,95,.6) 1px,transparent 1px);
  background-size:72px 72px;
  opacity:.2;
}
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.12;color:var(--text)}
h1{font-size:clamp(34px,4.6vw,64px)}
h2{font-size:clamp(26px,3vw,40px)}
h3{font-size:clamp(19px,1.6vw,24px)}
h4{font-size:17px}
p{text-wrap:pretty}
.tick-num{font-family:var(--font-mono);font-weight:600;font-variant-numeric:tabular-nums;letter-spacing:0}

/* ===== 4. layout ===== */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(20px,4vw,48px)}
.section{padding-block:clamp(56px,8vw,96px)}
.section--tight{padding-block:clamp(32px,4vw,56px)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(20px,3vw,32px)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}
.prose{max-width:var(--read);color:var(--text-2)}
.prose p{margin-bottom:1.1em}
.prose strong{color:var(--text)}
.prose h2,.prose h3{color:var(--text);margin:1.7em 0 .6em}
.prose h2:first-child,.prose h3:first-child{margin-top:0}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(47,243,208,.35)}
.prose a:hover{border-bottom-color:var(--cyan)}
.prose ul li{position:relative;padding-left:20px;margin-bottom:.6em}
.prose ul li::before{content:"";position:absolute;left:0;top:.75em;width:10px;height:1px;background:var(--cyan)}
.rule{height:1px;border:0;background:var(--grad-field);opacity:.45}
.kicker{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan)}
.kicker::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px rgba(47,243,208,.9)}
.lede{font-size:clamp(16px,1.4vw,18px);line-height:1.7;color:var(--text-2);max-width:60ch}

/* ===== 5. components ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 24px;border:1px solid var(--line);border-radius:2px;background:rgba(17,27,54,.72);color:var(--text);font-size:14px;font-weight:700;letter-spacing:.02em;cursor:pointer;transition:background .2s,border-color .2s,color .2s,transform .2s}
.btn:hover{border-color:var(--cyan);color:#FFFFFF;background:rgba(17,27,54,.95)}
.btn:active{transform:translateY(1px)}
.btn--primary{background:linear-gradient(100deg,#2FF3D0,#4C8DFF 55%,#FF5A1F);color:#05070F;border-color:transparent;font-weight:900}
.btn--primary:hover{color:#05070F;filter:brightness(1.08)}
.btn--ghost{background:transparent}
.tag{display:inline-flex;align-items:center;gap:8px;padding:4px 10px;border:1px solid var(--line);border-radius:999px;font-family:var(--font-mono);font-size:12px;font-weight:600;line-height:1.5;letter-spacing:.1em;text-transform:uppercase;color:var(--text-2)}
.tag--cyan{color:var(--cyan);border-color:rgba(47,243,208,.42)}
.tag--orange{color:var(--orange);border-color:rgba(255,90,31,.45)}
.tag--amber{color:var(--amber);border-color:rgba(255,194,75,.45)}
.panel{position:relative;padding:clamp(20px,2.4vw,28px);border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(180deg,rgba(17,27,54,.92),rgba(10,16,36,.9));box-shadow:0 1px 0 rgba(234,242,255,.03) inset}
.panel--glass{background:rgba(17,27,54,.55);backdrop-filter:blur(10px)}
.stat{display:flex;flex-direction:column;gap:8px}
.stat__value{font-family:var(--font-mono);font-weight:600;font-size:clamp(28px,3.4vw,44px);line-height:1;letter-spacing:-.02em;color:var(--cyan)}
.stat__label{font-family:var(--font-mono);font-size:11px;font-weight:600;line-height:1.5;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3)}
.data-bar{height:6px;border-radius:999px;background:rgba(30,58,95,.55);overflow:hidden}
.data-bar__fill{display:block;height:100%;width:var(--value,60%);background:var(--grad-field);border-radius:999px}
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--text-3)}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--text-2)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs li[aria-current="page"]{color:var(--text)}

/* image container */
.figure{position:relative;margin:0;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(160deg,rgba(17,27,54,.95),rgba(5,7,15,.9))}
.figure::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,transparent 55%,rgba(5,7,15,.55))}
.figure img{width:100%;height:100%;object-fit:cover}
.figure--16x9{aspect-ratio:16/9}
.figure--4x3{aspect-ratio:4/3}
.figure--21x9{aspect-ratio:21/9}
.figure--1x1{aspect-ratio:1/1}
.figure__caption{display:block;margin-top:10px;font-size:13px;color:var(--text-3)}
@media (max-width:640px){.figure--21x9{aspect-ratio:16/9}}

/* skill-tree path */
.path{display:grid}
.path__step{position:relative;display:grid;grid-template-columns:56px minmax(0,1fr);gap:clamp(14px,2vw,24px);padding:22px 0;border-bottom:1px solid rgba(30,58,95,.7)}
.path__step::before{content:"";position:absolute;left:27px;top:0;bottom:0;width:1px;background:linear-gradient(180deg,transparent,rgba(47,243,208,.45) 18%,rgba(30,58,95,.9) 82%,transparent)}
.path__index{position:relative;z-index:1;display:grid;place-items:center;width:54px;height:54px;border:1px solid var(--line);border-radius:50%;background:var(--ink-900);font-family:var(--font-mono);font-size:14px;font-weight:600;color:var(--cyan);letter-spacing:.04em}
.path__body{min-width:0}
.path__title{margin-bottom:6px}
.path__text{color:var(--text-2);font-size:15px}
.path__step:hover .path__index{border-color:var(--cyan);box-shadow:0 0 0 4px rgba(47,243,208,.08)}

/* left data rail */
.rail{display:none}
@media (min-width:1440px){
  .rail{display:flex;flex-direction:column;gap:14px;position:fixed;left:20px;top:calc(var(--header-h) + 32px);width:72px;z-index:40;padding:14px 8px;border:1px solid var(--line);border-radius:var(--radius);background:rgba(10,16,36,.72);backdrop-filter:blur(10px)}
  .rail__label{font-family:var(--font-mono);font-size:10px;font-weight:600;letter-spacing:.12em;line-height:1.4;color:var(--text-3);text-align:center}
  .rail__list{display:flex;flex-direction:column;gap:4px}
  .rail__link{display:block;padding:8px 4px;border:1px solid transparent;border-radius:2px;font-family:var(--font-mono);font-size:11px;font-weight:600;line-height:1.35;color:var(--text-2);text-align:center}
  .rail__link:hover{color:var(--cyan);border-color:rgba(47,243,208,.35)}
  .rail__link[aria-current]{color:var(--ink-950);background:var(--cyan);border-color:transparent}
}

/* ===== 6. header ===== */
.skip-link{position:absolute;left:16px;top:-64px;z-index:120;padding:10px 16px;border-radius:2px;background:var(--cyan);color:#05070F;font-size:14px;font-weight:700;transition:top .2s var(--ease)}
.skip-link:focus{top:12px}
.site-header{position:fixed;top:0;left:0;right:0;z-index:90}
.brand-band{max-height:76px;overflow:hidden;background:var(--ink-950);border-bottom:1px solid var(--line);transition:max-height .32s var(--ease),opacity .22s linear,border-color .32s linear}
.site-header[data-collapsed] .brand-band{max-height:0;opacity:0;border-color:transparent}
.brand-band__inner{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:clamp(16px,3vw,40px);min-height:66px;padding-block:10px}
.brand{display:inline-flex;align-items:center;gap:12px;min-width:0}
.brand__mark{display:grid;place-items:center;width:38px;height:38px;flex:0 0 38px;border:1px solid rgba(47,243,208,.45);border-radius:2px;background:linear-gradient(160deg,rgba(47,243,208,.14),rgba(76,141,255,.05));font-family:var(--font-mono);font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--cyan)}
.brand__text{display:flex;flex-direction:column;line-height:1.2;min-width:0}
.brand__name{font-size:16px;font-weight:900;letter-spacing:.02em;color:var(--text)}
.brand__line{font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--text-3)}
.brand:hover .brand__name{color:var(--cyan)}
.brand--compact{display:none;font-size:15px;font-weight:900;letter-spacing:.04em;color:var(--text);white-space:nowrap}
.site-header[data-collapsed] .brand--compact{display:inline-flex}
.quick-nav{margin-left:auto}
.quick-nav__list{display:flex;flex-wrap:wrap;gap:clamp(12px,2vw,28px)}
.quick-nav__link{position:relative;display:inline-block;padding-block:4px;font-size:13px;color:var(--text-2);transition:color .2s}
.quick-nav__link::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--cyan);transform:scaleX(0);transform-origin:left;transition:transform .24s var(--ease)}
.quick-nav__link:hover{color:var(--text)}
.quick-nav__link:hover::after{transform:scaleX(1)}
.live-strip{display:inline-flex;align-items:center;gap:10px;padding:9px 14px;border:1px solid var(--line);border-radius:999px;background:rgba(17,27,54,.6);font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.06em;color:var(--text-2);white-space:nowrap}
.live-strip__dot{width:8px;height:8px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 0 rgba(255,194,75,.55);animation:pulse 2.4s ease-out infinite}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(255,194,75,.5)}
  70%{box-shadow:0 0 0 10px rgba(255,194,75,0)}
  100%{box-shadow:0 0 0 0 rgba(255,194,75,0)}
}
.live-strip__label{color:var(--text-3)}
.live-strip__timer{color:var(--amber)}
.live-strip__feed{color:var(--cyan)}
.primary-band{background:rgba(10,16,36,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.primary-band__inner{display:flex;align-items:center;gap:clamp(16px,3vw,36px);min-height:58px;padding-block:6px}
.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:clamp(10px,1.8vw,24px)}
.site-nav__link{position:relative;display:inline-flex;align-items:baseline;gap:7px;padding:10px 2px;font-size:14px;font-weight:700;color:var(--text-2);transition:color .2s}
.site-nav__idx{font-family:var(--font-mono);font-size:10px;font-weight:600;letter-spacing:.1em;color:var(--text-3);transition:color .2s}
.site-nav__link::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--grad-field);transform:scaleX(0);transform-origin:left;transition:transform .28s var(--ease)}
.site-nav__link:hover{color:var(--text)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link:hover .site-nav__idx{color:var(--cyan)}
.site-nav__link[aria-current="page"]{color:var(--cyan)}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav-toggle{display:none;align-items:center;gap:10px;margin-left:auto;padding:10px 14px;border:1px solid var(--line);border-radius:2px;background:rgba(17,27,54,.75);color:var(--text);font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.12em;cursor:pointer;position:relative;z-index:96}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:var(--cyan);transition:background .2s}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--cyan);transition:transform .24s var(--ease)}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--grad-field);transform:scaleX(0);transform-origin:left;transition:transform .12s linear}
.mobile-dock{display:none}
.to-top{position:fixed;right:clamp(16px,3vw,32px);bottom:clamp(16px,3vw,32px);z-index:80;padding:12px 16px;border:1px solid var(--line);border-radius:2px;background:rgba(10,16,36,.92);backdrop-filter:blur(10px);color:var(--text-2);font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.1em;cursor:pointer;opacity:0;pointer-events:none;transform:translateY(10px);transition:opacity .28s var(--ease),transform .28s var(--ease),border-color .2s,color .2s}
.to-top.is-visible{opacity:1;pointer-events:auto;transform:none}
.to-top:hover{border-color:var(--cyan);color:var(--cyan)}
body.is-nav-open{overflow:hidden}

/* ===== 7. footer ===== */
.site-footer{position:relative;margin-top:clamp(64px,10vw,128px);background:linear-gradient(180deg,var(--ink-900),var(--ink-950));border-top:1px solid var(--line)}
.site-footer::before{content:"";position:absolute;left:0;right:0;top:-1px;height:1px;background:var(--grad-field);opacity:.65}
.footer__inner{display:grid;gap:clamp(28px,4vw,48px);padding-block:clamp(48px,7vw,80px)}
.footer__top{display:grid;grid-template-columns:minmax(240px,1.5fr) 3fr;gap:clamp(24px,4vw,56px)}
.footer__mark{font-size:20px;font-weight:900;letter-spacing:.02em}
.footer__tag{margin-top:6px;font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan)}
.footer__note{margin-top:14px;font-size:14px;color:var(--text-3);max-width:26ch}
.footer__cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(18px,2.4vw,32px)}
.footer-col__title{font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3)}
.footer-col__list{display:grid;gap:10px;margin-top:14px}
.footer-link{display:inline-block;font-size:14px;color:var(--text-2);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.footer-link:hover{color:var(--cyan);border-bottom-color:rgba(47,243,208,.5)}
.footer__contact{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px 32px;padding-top:clamp(24px,3vw,36px);border-top:1px solid rgba(30,58,95,.7)}
.contact-item{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px}
.contact-item--wide{grid-column:1/-1}
.contact-item__label{width:100%;font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3)}
.contact-item__value{font-size:14px;color:var(--text);word-break:break-all}
.contact-item__copy{padding:4px 10px;border:1px solid var(--line);border-radius:2px;font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--text-2);cursor:pointer;transition:border-color .2s,color .2s,background .2s}
.contact-item__copy:hover{border-color:var(--cyan);color:var(--cyan)}
.contact-item__copy.is-done{border-color:var(--cyan);color:var(--ink-950);background:var(--cyan)}
.footer__hint{grid-column:1/-1;font-size:13px;color:var(--text-3)}
.footer__meta{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-top:20px;border-top:1px solid rgba(30,58,95,.7);font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--text-3)}
.footer__icp{color:var(--text-3)}
.footer__copyright{color:var(--text-3)}

/* ===== 8. reveal ===== */
html.has-js [data-reveal]{opacity:0;transform:translateY(16px)}
html.has-js [data-reveal].is-in{opacity:1;transform:none;transition:opacity .32s var(--ease),transform .32s var(--ease)}

/* ===== 9. responsive ===== */
@media (max-width:1100px){
  .footer__top{grid-template-columns:1fr}
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:960px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4{grid-column:span 6}
  .brand-band__inner{grid-template-columns:minmax(0,1fr) auto;gap:14px}
  .quick-nav{display:none}
  .brand--compact{display:inline-flex}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;top:0;right:0;z-index:94;
    width:min(86vw,360px);height:100vh;height:100dvh;
    padding:calc(var(--header-h) + 16px) clamp(20px,5vw,32px) 32px;
    margin-left:0;
    background:linear-gradient(200deg,var(--panel-800),var(--ink-900) 62%);
    border-left:1px solid var(--line);
    box-shadow:-24px 0 60px rgba(5,7,15,.72);
    transform:translateX(102%);
    transition:transform .32s var(--ease);
    overflow-y:auto;
  }
  .site-nav[data-open]{transform:translateX(0)}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__link{justify-content:flex-start;padding:16px 10px;font-size:17px;border-bottom:1px solid rgba(30,58,95,.7)}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{background:linear-gradient(90deg,rgba(47,243,208,.12),transparent 72%)}
  .mobile-dock{display:block;position:fixed;left:0;right:0;bottom:0;z-index:88;background:rgba(5,7,15,.94);backdrop-filter:blur(12px);border-top:1px solid var(--line)}
  .mobile-dock__nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
  .mobile-dock__link{padding:13px 6px;text-align:center;font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--text-2);border-left:1px solid rgba(30,58,95,.6)}
  .mobile-dock__nav>.mobile-dock__link:first-child{border-left:0}
  .mobile-dock__link[aria-current="page"]{color:var(--cyan)}
  body{padding-bottom:58px}
  .to-top{bottom:74px}
}
@media (max-width:640px){
  .col-3,.col-4,.col-6,.col-8{grid-column:span 6}
  .live-strip__label{display:none}
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__meta{flex-direction:column;align-items:flex-start;gap:6px}
  .footer__note{max-width:none}
}

/* ===== 10. motion / a11y ===== */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .live-strip__dot{animation:none}
  html.has-js [data-reveal]{opacity:1;transform:none}
  .to-top{transform:none}
}
@media print{
  .site-header,.mobile-dock,.to-top,.rail{display:none}
  body{padding-top:0;background:#fff;color:#000}
}