/* ============ 1. Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:where(a,button,summary):focus-visible{outline:2px solid var(--cyan-400);outline-offset:3px;border-radius:6px}

/* ============ 2. Tokens ============ */
:root{
  --ink-950:#08111F;
  --ink-900:#0C1B2E;
  --ink-800:#12263D;
  --ink-700:#1B3552;
  --cyan-400:#3FE0D0;
  --cyan-200:#A8F3EC;
  --gold-400:#F2B45C;
  --gold-200:#FFD9A0;
  --rock-300:#C8D2DC;
  --paper-50:#EEF3F7;

  --panel:var(--ink-800);
  --line:rgba(200,210,220,.14);
  --line-strong:rgba(63,224,208,.34);
  --glass:rgba(18,38,61,.55);

  --font-head:"Archivo Narrow","Roboto Condensed","Noto Sans SC","PingFang SC",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","HarmonyOS Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --fs-display:clamp(2.4rem,5.2vw,4rem);
  --fs-h1:clamp(1.85rem,3.4vw,2.75rem);
  --fs-h2:clamp(1.4rem,2.3vw,1.875rem);
  --fs-h3:1.375rem;
  --fs-body:1rem;
  --fs-sm:.875rem;
  --fs-tag:.72rem;

  --sp-section:clamp(3.5rem,7vw,6.5rem);
  --radius:14px;
  --radius-lg:22px;
  --shell:1360px;
  --gutter:clamp(1.25rem,4vw,6rem);
  --rail:72px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ============ 3. Base ============ */
body{
  min-height:100vh;
  color:var(--paper-50);
  font-family:var(--font-body);
  font-size:var(--fs-body);
  line-height:1.75;
  letter-spacing:.005em;
  background:
    radial-gradient(1100px 700px at 12% -12%, rgba(63,224,208,.10), transparent 62%),
    radial-gradient(900px 640px at 92% 2%, rgba(242,180,92,.08), transparent 60%),
    var(--ink-950);
  background-attachment:fixed;
}
h1,h2,h3,h4,h5{font-family:var(--font-head);font-weight:700;line-height:1.2;letter-spacing:-.01em}
h1{font-size:var(--fs-h1)}
h2{font-size:var(--fs-h2);line-height:1.25}
h3{font-size:var(--fs-h3);font-weight:600;line-height:1.35}
p{max-width:42ch}
strong{font-weight:700;color:var(--cyan-200)}
::selection{background:var(--cyan-400);color:var(--ink-950)}

/* ============ 4. Layout ============ */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{position:relative;padding-block:var(--sp-section)}
.section + .section{border-top:1px solid var(--line)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:1rem;margin-bottom:clamp(1.5rem,3vw,2.5rem)}
.section-head__text{max-width:62ch}
.section-head__text p{margin-top:.6rem;font-size:.95rem;color:var(--rock-300);max-width:56ch}
.grid{display:grid;gap:clamp(1rem,2vw,1.75rem)}
.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--5-7{grid-template-columns:5fr 7fr}
.grid--7-5{grid-template-columns:7fr 5fr}

/* ============ 5. Type helpers ============ */
.display-title{font-family:var(--font-head);font-weight:800;font-size:var(--fs-display);line-height:1.05;letter-spacing:-.018em}
.eyebrow{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--font-mono);font-size:var(--fs-tag);letter-spacing:.16em;text-transform:uppercase;color:var(--cyan-400)}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.7}
.lede{max-width:44ch;font-size:clamp(1.02rem,1.5vw,1.15rem);line-height:1.8;color:var(--rock-300)}
.muted{color:var(--rock-300)}
.measure{max-width:42ch}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.gold{color:var(--gold-400)}
.cyan{color:var(--cyan-400)}
.stack{display:flex;flex-direction:column;gap:1rem}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem}

/* ============ 6. Components ============ */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.82rem 1.45rem;border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-head);font-weight:700;font-size:.95rem;letter-spacing:.04em;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--cyan-400);border-color:var(--cyan-400);color:var(--ink-950)}
.btn--primary:hover{background:var(--cyan-200);border-color:var(--cyan-200)}
.btn--gold{background:var(--gold-400);border-color:var(--gold-400);color:var(--ink-950)}
.btn--gold:hover{background:var(--gold-200);border-color:var(--gold-200)}
.btn--ghost{background:rgba(18,38,61,.6);border-color:var(--line-strong);color:var(--paper-50)}
.btn--ghost:hover{border-color:var(--cyan-400);color:var(--cyan-200)}
.btn__arrow{font-family:var(--font-mono);font-size:.85em;opacity:.85}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.22rem .6rem;border-radius:6px;
  border:1px solid var(--line);background:rgba(27,53,82,.5);color:var(--rock-300);
  font-family:var(--font-mono);font-size:var(--fs-tag);letter-spacing:.1em;text-transform:uppercase;
}
.tag--cyan{background:var(--cyan-200);border-color:var(--cyan-200);color:var(--ink-950)}
.tag--gold{background:rgba(242,180,92,.12);border-color:rgba(242,180,92,.45);color:var(--gold-200)}

.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-lg);padding:clamp(1.1rem,2vw,1.75rem)}
.glass-panel{background:var(--glass);border:1px solid rgba(200,210,220,.16);border-radius:var(--radius-lg);backdrop-filter:blur(14px) saturate(140%);padding:clamp(1.1rem,2vw,1.75rem)}
.panel--accent{border-color:var(--line-strong);box-shadow:0 26px 64px -44px rgba(63,224,208,.8)}

.breadcrumb{padding-top:1.5rem}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-family:var(--font-mono);font-size:.76rem;letter-spacing:.06em;color:var(--rock-300)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.5rem}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(200,210,220,.4)}
.breadcrumb__list a:hover{color:var(--cyan-200)}
.breadcrumb__item[aria-current="page"]{color:var(--gold-400)}

.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--line);border-radius:var(--radius-lg);
  background:linear-gradient(140deg,var(--ink-800),var(--ink-900));
}
.media-frame img,.media-frame video{width:100%;height:100%;object-fit:cover}
.media-frame::after{content:"";position:absolute;inset:9px;border:1px solid rgba(63,224,208,.22);border-radius:calc(var(--radius-lg) - 9px);pointer-events:none}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:1;
  padding:1.6rem 1rem .8rem;
  font-family:var(--font-mono);font-size:var(--fs-tag);letter-spacing:.1em;text-transform:uppercase;color:var(--paper-50);
  background:linear-gradient(180deg,transparent,rgba(8,17,31,.9));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}

.rail-scroll{
  display:flex;gap:clamp(.9rem,1.6vw,1.4rem);
  overflow-x:auto;scroll-snap-type:x mandatory;
  padding-bottom:1rem;
  scrollbar-color:var(--line-strong) transparent;
}
.rail-scroll > *{flex:0 0 min(360px,78vw);scroll-snap-align:start}

.index-rail{position:sticky;top:132px;display:grid;gap:.3rem;align-self:start}
.index-rail__item{
  display:flex;align-items:baseline;gap:.6rem;
  padding:.5rem .7rem;border-left:2px solid transparent;border-radius:0 10px 10px 0;
  font-size:.84rem;color:var(--rock-300);
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.index-rail__item:hover{color:var(--paper-50);background:rgba(63,224,208,.07)}
.index-rail__item[aria-current="true"]{color:var(--cyan-200);border-left-color:var(--cyan-400);background:rgba(63,224,208,.08)}
.index-rail__num{font-family:var(--font-mono);font-size:.7rem;color:var(--gold-400)}

/* ============ 7. Header ============ */
.skip-link{
  position:absolute;left:1rem;top:-5rem;z-index:200;
  padding:.7rem 1.15rem;border-radius:10px;
  background:var(--cyan-400);color:var(--ink-950);
  font-family:var(--font-head);font-weight:700;font-size:.85rem;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:1rem}

.site-header{
  position:sticky;top:0;z-index:80;
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(8,17,31,.94),rgba(8,17,31,.76));
  backdrop-filter:blur(14px) saturate(140%);
  transition:background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:4px;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(63,224,208,.3) 0 1px,transparent 1px 26px);
  opacity:.55;
}
.header-inner{
  display:flex;align-items:center;gap:clamp(.6rem,1.6vw,1.5rem);
  width:100%;max-width:var(--shell);margin-inline:auto;
  min-height:78px;padding:clamp(.7rem,1.4vw,1rem) var(--gutter);
  transition:min-height .24s var(--ease),padding .24s var(--ease);
}
.site-header[data-scrolled] .header-inner{min-height:62px;padding-block:.5rem}

.brand{display:flex;align-items:center;gap:.7rem;flex:0 0 auto}
.brand-mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:38px;height:38px;border-radius:11px;
  background:linear-gradient(150deg,var(--cyan-400),#1c7f8c 72%);
  color:var(--ink-950);font-family:var(--font-head);font-weight:800;font-size:1.15rem;
  box-shadow:0 0 0 1px rgba(63,224,208,.4),0 12px 26px -14px rgba(63,224,208,.8);
}
.brand-text{display:flex;flex-direction:column;line-height:1.12}
.brand-name{font-family:var(--font-head);font-weight:700;font-size:1.02rem;letter-spacing:.02em}
.brand-sub{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.14em;text-transform:uppercase;color:var(--rock-300)}
.brand-version{
  padding:.18rem .45rem;border-radius:6px;
  border:1px solid rgba(242,180,92,.45);background:rgba(242,180,92,.1);
  color:var(--gold-400);font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;
}
.brand:hover .brand-name{color:var(--cyan-200)}

.nav-capsule{flex:1 1 auto;display:flex;justify-content:center}
.nav-list{
  display:flex;align-items:center;gap:.15rem;
  padding:.3rem;border-radius:999px;
  background:rgba(27,53,82,.55);border:1px solid var(--line);
  backdrop-filter:blur(10px);
}
.nav-link{
  display:block;padding:.5rem .92rem;border-radius:999px;
  font-size:.9rem;color:var(--rock-300);white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-link:hover{color:var(--paper-50);background:rgba(63,224,208,.12)}
.nav-link[aria-current="page"]{
  background:var(--cyan-400);color:var(--ink-950);font-weight:700;
  box-shadow:0 10px 22px -14px rgba(63,224,208,.95);
}

.header-actions{display:flex;align-items:center;gap:.6rem;flex:0 0 auto}
.account-chip{
  display:flex;flex-direction:column;gap:.05rem;
  padding:.42rem .85rem;border-radius:12px;
  border:1px solid var(--line-strong);background:rgba(12,27,46,.72);
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.account-chip:hover{border-color:var(--cyan-400);background:rgba(63,224,208,.1)}
.account-chip__label{font-family:var(--font-head);font-weight:700;font-size:.84rem;letter-spacing:.03em}
.account-chip__hint{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.1em;color:var(--gold-400)}
.batch-status{display:inline-flex;align-items:center;gap:.45rem;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;color:var(--rock-300)}
.batch-status__dot{width:8px;height:8px;border-radius:50%;background:var(--cyan-400);box-shadow:0 0 0 3px rgba(63,224,208,.18);animation:status-pulse 2.6s var(--ease) infinite}
@keyframes status-pulse{
  0%,100%{box-shadow:0 0 0 3px rgba(63,224,208,.18)}
  50%{box-shadow:0 0 0 7px rgba(63,224,208,.04)}
}

.nav-toggle{
  display:none;align-items:center;gap:.5rem;
  padding:.5rem .85rem;border-radius:999px;
  border:1px solid var(--line-strong);background:rgba(27,53,82,.62);
  font-family:var(--font-head);font-weight:700;font-size:.82rem;letter-spacing:.06em;
}
.nav-toggle:hover{border-color:var(--cyan-400)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars i{display:block;height:2px;border-radius:2px;background:var(--cyan-400);transition:transform .18s var(--ease),opacity .18s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.header-progress{
  position:absolute;left:0;bottom:0;z-index:2;height:2px;width:100%;pointer-events:none;
  background:linear-gradient(90deg,var(--cyan-400),var(--gold-400));
  transform:scaleX(var(--progress,0));transform-origin:left center;
  transition:transform .1s linear;
}

/* ============ 8. Footer ============ */
.site-footer{
  position:relative;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(12,27,46,.5),var(--ink-950) 62%),var(--ink-900);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(63,224,208,.55),rgba(242,180,92,.45),transparent);
}
.footer-inner{width:100%;max-width:var(--shell);margin-inline:auto;padding:clamp(2.5rem,5vw,4.5rem) var(--gutter) 1.5rem}
.footer-grid{display:grid;gap:clamp(1.6rem,3vw,3rem);grid-template-columns:1.4fr 1fr 1fr 1.35fr}
.footer-col{min-width:0}
.footer-col__title{margin-bottom:.9rem;font-family:var(--font-mono);font-size:.7rem;font-weight:400;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan-400)}
.footer-brand{display:flex;align-items:center;gap:.7rem;margin-bottom:.9rem}
.footer-note{max-width:36ch;font-size:.85rem;line-height:1.75;color:var(--rock-300)}
.footer-version{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:1rem}
.footer-links{display:grid;gap:.55rem}
.footer-links a{
  display:inline-flex;align-items:center;gap:.55rem;
  font-size:.9rem;color:var(--rock-300);
  transition:color .18s var(--ease);
}
.footer-links a::before{content:"";width:5px;height:5px;border:1px solid currentColor;border-radius:1px;opacity:.6}
.footer-links a:hover{color:var(--cyan-200)}
.footer-links a:hover::before{background:var(--cyan-400);border-color:var(--cyan-400);opacity:1}
.footer-contact{display:grid;gap:.7rem}
.footer-contact__row{display:flex;gap:.7rem;align-items:flex-start}
.footer-contact__key{
  flex:0 0 auto;min-width:42px;padding-top:.22rem;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-400);
}
.footer-contact__val{font-size:.88rem;line-height:1.65;color:var(--rock-300);overflow-wrap:anywhere}
.footer-tip{
  margin-top:1rem;padding-left:.85rem;border-left:2px solid var(--line-strong);
  font-size:.78rem;line-height:1.75;color:rgba(200,210,220,.75);
}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.5rem;
  margin-top:clamp(2rem,4vw,3rem);padding-top:1.2rem;border-top:1px solid var(--line);
}
.footer-bottom__meta{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.05em;color:rgba(200,210,220,.7)}

/* ============ 9. Motion ============ */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .32s var(--ease),transform .32s var(--ease)}
.js .reveal[data-visible]{opacity:1;transform:none}

/* ============ 10. Responsive ============ */
@media (max-width:1180px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .batch-status{display:none}
}
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:960px){
  :root{--gutter:clamp(1.1rem,5vw,2rem)}
  html{scroll-padding-top:88px}
  .nav-toggle{display:inline-flex}
  .nav-capsule{
    position:absolute;left:var(--gutter);right:var(--gutter);top:calc(100% + 8px);
    display:block;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s linear;
  }
  .nav-capsule[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{
    flex-direction:column;align-items:stretch;gap:.2rem;
    padding:.6rem;border-radius:18px;
    background:rgba(12,27,46,.97);
    box-shadow:0 30px 64px -30px rgba(0,0,0,.92);
    max-height:calc(100vh - 120px);overflow-y:auto;
  }
  .nav-link{padding:.75rem .9rem;border-radius:12px;font-size:1rem}
  .grid--2,.grid--3,.grid--5-7,.grid--7-5{grid-template-columns:1fr}
  .index-rail{position:static;grid-auto-flow:column;grid-auto-columns:max-content;overflow-x:auto;padding-bottom:.5rem}
}
@media (max-width:640px){
  .brand-sub{display:none}
  .account-chip__hint{display:none}
  .account-chip{padding:.5rem .75rem}
  .brand-version{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .rail-scroll > *{flex:0 0 82vw}
}

/* ============ 11. 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}
  .js .reveal{opacity:1;transform:none}
  .header-progress{transition:none}
}