*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,picture,video,canvas,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:900;letter-spacing:-.02em;line-height:1.15}

:root{
  --ink-900:#06111F;
  --ink-850:#08182A;
  --ink-800:#0B1F36;
  --ink-700:#122B47;
  --blue:#0A6CFF;
  --blue-soft:#3D93FF;
  --cyan:#00E5C3;
  --orange:#FF7A1A;
  --mist:#F2F7FF;
  --slate:#9DB1CB;
  --green:#3DDB8A;
  --red:#FF5C7A;
  --line:rgba(157,177,203,.16);
  --line-strong:rgba(157,177,203,.32);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"JetBrains Mono","Cascadia Mono","Roboto Mono",Menlo,Consolas,monospace;
  --edge:clamp(16px,3vw,44px);
  --maxw:1320px;
  --radius-lg:20px 6px 20px 6px;
  --radius-md:14px 5px 14px 5px;
  --pill:999px;
  --dur:.2s;
  --ease:cubic-bezier(.22,1,.36,1);
}

body{
  background-color:var(--ink-900);
  background-image:
    radial-gradient(120% 90% at 6% -12%,rgba(10,108,255,.16),transparent 55%),
    radial-gradient(90% 70% at 100% 0%,rgba(0,229,195,.07),transparent 60%);
  background-attachment:fixed;
  color:var(--mist);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

:where(a,button):focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

#main-content{scroll-margin-top:92px}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-180%);
  padding:10px 18px;border-radius:var(--pill);
  background:var(--cyan);color:#04202a;
  font-size:13px;font-weight:700;letter-spacing:.04em;
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus-visible{transform:translateY(0);outline:2px solid var(--mist);outline-offset:3px}

.container{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding-inline:var(--edge);
}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:
    linear-gradient(180deg,rgba(6,17,31,.97),rgba(6,17,31,.9)),
    radial-gradient(120% 180% at 10% 0%,rgba(10,108,255,.3),transparent 62%);
  border-bottom:1px solid var(--line);
  color:var(--mist);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(0,229,195,.65),rgba(10,108,255,.55),transparent);
  pointer-events:none;
}
.header-shell{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  column-gap:clamp(10px,1.8vw,26px);
  max-width:1440px;margin-inline:auto;
  padding:11px var(--edge);
}

.brand-mark{display:inline-flex;align-items:center;gap:12px;min-width:0}
.brand-glyph{
  display:grid;place-items:center;flex:0 0 auto;
  width:44px;height:44px;
  border-radius:var(--radius-md);
  font-family:var(--font-mono);
  font-size:15px;font-weight:700;letter-spacing:-.03em;
  color:#03131f;
  background:linear-gradient(145deg,var(--cyan),var(--blue-soft));
  box-shadow:0 0 0 1px rgba(0,229,195,.45),0 12px 26px -14px rgba(0,229,195,.9);
}
.brand-text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-name{
  font-size:17px;font-weight:900;letter-spacing:.01em;line-height:1.25;
  white-space:nowrap;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10.5px;letter-spacing:.16em;
  color:var(--slate);white-space:nowrap;
}
.brand-mark:hover .brand-glyph{box-shadow:0 0 0 1px var(--cyan),0 14px 30px -12px rgba(0,229,195,1)}
.brand-mark:hover .brand-name{color:var(--cyan)}

.primary-nav{display:flex;justify-content:center;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-list a{
  position:relative;
  display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 11px;border-radius:9px;
  color:var(--slate);
  font-size:14.5px;font-weight:600;letter-spacing:.01em;
  white-space:nowrap;
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-index{
  font-family:var(--font-mono);
  font-size:10px;font-weight:500;letter-spacing:0;
  color:rgba(157,177,203,.62);
  transform:translateY(-2px);
}
.nav-list a:hover{color:var(--mist);background:rgba(10,108,255,.16)}
.nav-list a[aria-current="page"]{color:var(--cyan);background:rgba(0,229,195,.1)}
.nav-list a[aria-current="page"] .nav-index{color:var(--cyan)}
.nav-list a[aria-current="page"]::after{
  content:"";position:absolute;left:11px;right:11px;bottom:3px;height:2px;
  border-radius:2px;background:var(--cyan);
}

.header-actions{display:flex;align-items:center;gap:8px}
.util-link{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 11px;
  border:1px solid var(--line-strong);
  border-radius:var(--pill);
  font-size:12.5px;font-weight:500;letter-spacing:.02em;
  color:var(--slate);white-space:nowrap;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.util-link::before{
  content:"";width:5px;height:5px;border-radius:50%;
  background:var(--blue-soft);
  box-shadow:0 0 7px rgba(61,147,255,.95);
  transition:background-color var(--dur) var(--ease);
}
.util-link:hover{color:var(--mist);border-color:rgba(0,229,195,.55);background:rgba(0,229,195,.08)}
.util-link:hover::before{background:var(--cyan)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;
  border:1px solid var(--line-strong);
  border-radius:10px;
  background:rgba(11,31,54,.75);
  color:var(--mist);
  font-size:13px;font-weight:700;letter-spacing:.04em;
}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:var(--cyan);
  transition:transform var(--dur) var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-4px) rotate(-45deg)}

.scroll-meter{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(157,177,203,.12);
  overflow:hidden;pointer-events:none;
}
.scroll-meter-fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--blue),var(--cyan) 68%,var(--orange));
  transition:width .12s linear;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--pill);
  font-size:14px;font-weight:700;letter-spacing:.03em;
  border:1px solid transparent;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.btn-sm{padding:8px 16px;font-size:13px}
.btn-accent{background:var(--orange);color:#1b0c01;box-shadow:0 0 0 1px rgba(255,122,26,.5),0 12px 26px -16px rgba(255,122,26,.95)}
.btn-accent:hover{background:#ff8f38}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 0 0 1px rgba(10,108,255,.5),0 14px 30px -18px rgba(10,108,255,1)}
.btn-primary:hover{background:var(--blue-soft)}
.btn-ghost{background:transparent;color:var(--mist);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,120px);
  background:
    radial-gradient(130% 150% at 86% -10%,rgba(10,108,255,.2),transparent 58%),
    linear-gradient(180deg,rgba(11,31,54,.92),rgba(6,17,31,1));
  border-top:1px solid var(--line);
  color:var(--mist);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(circle at 18% 118%,rgba(0,229,195,.16),transparent 46%),
    radial-gradient(circle at 82% -30%,rgba(10,108,255,.22),transparent 52%);
}
.footer-inner{
  position:relative;
  max-width:var(--maxw);margin-inline:auto;
  padding:clamp(36px,5vw,66px) var(--edge) clamp(26px,3vw,40px);
  display:grid;
  grid-template-columns:minmax(240px,1.05fr) minmax(0,1.75fr);
  gap:clamp(28px,5vw,72px);
}
.footer-wordmark{
  font-size:clamp(20px,2.2vw,26px);font-weight:900;letter-spacing:-.02em;
  padding-bottom:10px;margin-bottom:12px;
  border-bottom:2px solid var(--cyan);
  display:inline-block;
}
.footer-tagline{
  font-size:13.5px;line-height:1.8;color:var(--slate);
  max-width:32ch;
}
.footer-contact{
  display:grid;gap:9px;
  margin-top:22px;
  font-size:13.5px;line-height:1.7;
}
.footer-contact-row{display:flex;align-items:baseline;gap:10px}
.footer-contact-label{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:10.5px;letter-spacing:.16em;
  color:rgba(157,177,203,.72);
}
.footer-contact-value{color:var(--mist);opacity:.86;word-break:break-word}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer-col-title{
  font-family:var(--font-mono);
  font-size:11.5px;font-weight:600;letter-spacing:.2em;
  color:var(--cyan);
  margin-bottom:14px;
}
.footer-link-list li+li{margin-top:9px}
.footer-link{
  position:relative;
  display:inline-block;
  font-size:14.5px;font-weight:500;
  color:var(--slate);
  padding-left:0;
  transition:color var(--dur) var(--ease),padding-left var(--dur) var(--ease);
}
.footer-link::before{
  content:"";position:absolute;left:0;top:50%;
  width:0;height:1px;background:var(--cyan);
  transform:translateY(-50%);
  transition:width var(--dur) var(--ease);
}
.footer-link:hover{color:var(--mist);padding-left:14px}
.footer-link:hover::before{width:9px}

.footer-meta{
  position:relative;
  max-width:var(--maxw);margin-inline:auto;
  padding:16px var(--edge) 28px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:8px 26px;
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.06em;
  color:rgba(157,177,203,.78);
}
.footer-meta-item--dim{color:rgba(157,177,203,.5)}

/* ---------- generic content ---------- */
.section{padding-block:clamp(40px,6vw,88px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 20px;
  margin-bottom:clamp(20px,3vw,36px);
}
.section-kicker{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.22em;
  color:var(--cyan);
}
.section-title{
  font-size:clamp(24px,3.4vw,42px);font-weight:900;letter-spacing:-.025em;line-height:1.1;
}
.lede{
  font-size:clamp(15px,1.5vw,17px);line-height:1.85;
  color:rgba(242,247,255,.82);
  max-width:62ch;
}
.rule{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--line-strong),transparent)}

.breadcrumbs{
  font-family:var(--font-mono);
  font-size:12.5px;letter-spacing:.04em;
  color:var(--slate);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:rgba(157,177,203,.45);margin-right:8px}
.breadcrumbs a{transition:color var(--dur) var(--ease)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--mist)}

.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(11,31,54,.95),rgba(8,24,42,.92));
  transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.card:hover{border-color:rgba(0,229,195,.45);box-shadow:0 26px 52px -34px rgba(0,229,195,.55)}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.card-title{font-size:clamp(16px,1.6vw,19px);font-weight:800;letter-spacing:-.01em}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:var(--pill);
  font-size:11.5px;font-weight:600;letter-spacing:.06em;
  border:1px solid transparent;white-space:nowrap;
}
.tag-blue{color:var(--blue-soft);background:rgba(10,108,255,.16);border-color:rgba(10,108,255,.42)}
.tag-cyan{color:var(--cyan);background:rgba(0,229,195,.12);border-color:rgba(0,229,195,.42)}
.tag-orange{color:var(--orange);background:rgba(255,122,26,.13);border-color:rgba(255,122,26,.44)}
.tag-green{color:var(--green);background:rgba(61,219,138,.12);border-color:rgba(61,219,138,.4)}
.tag-red{color:var(--red);background:rgba(255,92,122,.12);border-color:rgba(255,92,122,.42)}
.tag-muted{color:var(--slate);background:rgba(157,177,203,.1);border-color:rgba(157,177,203,.28)}

.reading{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:700;letter-spacing:-.02em;line-height:1;
}

.media-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:radial-gradient(120% 120% at 18% 0%,rgba(10,108,255,.28),rgba(6,17,31,.94) 66%);
}
.media-frame img,.media-frame picture,.media-frame video,.media-frame svg{
  width:100%;height:100%;object-fit:cover;
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,transparent 55%,rgba(6,17,31,.6));
}
.media-frame--ratio-16x9{aspect-ratio:16/9}
.media-frame--ratio-4x3{aspect-ratio:4/3}
.media-frame--ratio-1x1{aspect-ratio:1/1}
.media-frame--ratio-21x9{aspect-ratio:21/9}
.media-frame--placeholder{
  display:grid;place-items:center;min-height:180px;
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.2em;
  color:rgba(157,177,203,.72);
  text-align:center;padding:20px;
}

.scanlines{position:relative;isolation:isolate}
.scanlines::after{
  content:"";position:absolute;inset:0;pointer-events:none;border-radius:inherit;
  background:repeating-linear-gradient(180deg,rgba(157,177,203,.09) 0 1px,transparent 1px 4px);
  opacity:.45;
}

.auto-grid{
  display:grid;gap:clamp(14px,2vw,24px);
  grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));
}
.split-grid{
  display:grid;gap:clamp(20px,3vw,40px);
  grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);
}
.stack{display:flex;flex-direction:column;gap:var(--stack-gap,14px)}

/* ---------- reveal protocol ---------- */
[data-reveal]{transition:opacity .55s var(--ease),transform .55s var(--ease)}
html[data-reveal-ready="true"] [data-reveal]{opacity:0;transform:translateY(16px)}
html[data-reveal-ready="true"] [data-reveal][data-reveal-state="in"]{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .util-link{padding:6px 9px;font-size:12px}
}

@media (max-width:1040px){
  .header-shell{
    grid-template-columns:minmax(0,1fr) auto;
  }
  .brand-mark{grid-column:1;grid-row:1}
  .nav-toggle{display:inline-flex;grid-column:2;grid-row:1}
  .primary-nav{
    display:none;
    grid-column:1/-1;grid-row:2;
    padding-top:10px;
  }
  .header-actions{display:none;grid-column:1/-1;grid-row:3}
  .util-link{display:none}

  .site-header[data-open="true"] .primary-nav{display:block;animation:nav-reveal .22s var(--ease) both}
  .site-header[data-open="true"] .header-actions{
    display:flex;flex-wrap:wrap;gap:8px;
    margin-top:10px;padding-top:12px;
    border-top:1px solid var(--line);
  }
  .site-header[data-open="true"] .util-link{display:inline-flex}

  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-list a{
    padding:12px 14px;border-radius:10px;
    font-size:15px;justify-content:flex-start;
  }
  .nav-list a[aria-current="page"]::after{display:none}
  .nav-list a[aria-current="page"]{box-shadow:inset 3px 0 0 var(--cyan)}
  .nav-index{font-size:10.5px}

  @keyframes nav-reveal{
    from{opacity:0;transform:translateY(-6px)}
    to{opacity:1;transform:none}
  }

  body{background-attachment:scroll}
}

@media (max-width:900px){
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr))}
  .split-grid{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:640px){
  .brand-glyph{width:38px;height:38px;font-size:13px;border-radius:12px 4px 12px 4px}
  .brand-name{font-size:15.5px}
  .brand-sub{font-size:9.5px;letter-spacing:.12em}
  .footer-nav{grid-template-columns:minmax(0,1fr);gap:22px}
  .footer-contact-row{flex-direction:column;gap:2px}
  .footer-meta{font-size:11px;letter-spacing:.04em}
  .btn{padding:11px 18px;font-size:13.5px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html[data-reveal-ready="true"] [data-reveal]{opacity:1;transform:none}
  .scroll-meter-fill{transition:none}
}