:root{
  --ink:#0A1626;
  --ink-2:#10233A;
  --ink-3:#0C1C30;
  --line:#1E3A5F;
  --orange:#FF6A1A;
  --cyan:#16D5C8;
  --acid:#C6F24E;
  --text:#E9EEF5;
  --muted:#9FB0C4;
  --abyss:#060D16;
  --alert:#FF4D5E;
  --shell:1160px;
  --shadow:8px 8px 0 rgba(6,13,22,.9),0 18px 40px rgba(0,0,0,.45);
  --shadow-soft:4px 4px 0 rgba(6,13,22,.75);
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-display:"PingFang SC","Helvetica Neue",Helvetica,Arial,"Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background-color:var(--ink);
  background-image:repeating-linear-gradient(90deg,rgba(30,58,95,.30) 0 1px,transparent 1px 104px);
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{display:block;max-width:100%}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--acid);outline-offset:3px}
::selection{background:var(--orange);color:var(--abyss)}

.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(1rem,4vw,2.5rem)}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:1rem;top:-4.5rem;z-index:200;
  background:var(--acid);color:var(--abyss);border:2px solid var(--abyss);
  font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;
  padding:.6rem 1rem;text-decoration:none;transition:top .18s ease;
}
.skip-link:focus{top:.75rem}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  padding:.68rem 1.15rem;border:2px solid var(--line);background:var(--ink-2);
  color:var(--text);font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;
  text-decoration:none;box-shadow:var(--shadow-soft);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease,background .18s ease,color .18s ease;
}
.btn:hover{transform:translateY(-2px);border-color:var(--cyan);box-shadow:var(--shadow);color:var(--text)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:var(--abyss);font-weight:700}
.btn--primary:hover{background:#ff7f3c;border-color:var(--acid);color:var(--abyss)}
.btn--ghost{background:transparent;color:var(--muted)}
.btn--ghost:hover{color:var(--acid)}
.btn--acid{background:var(--acid);border-color:var(--acid);color:var(--abyss);font-weight:700}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--ink);border-bottom:1px solid var(--line)}
.header-utility{background:var(--ink);border-bottom:1px solid var(--line)}
.utility-inner{display:flex;align-items:center;gap:1rem;min-height:74px;padding-block:.7rem;flex-wrap:wrap}

.brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;color:var(--text)}
.brand-mark{
  display:grid;place-items:center;width:46px;height:46px;flex:0 0 auto;
  border:2px solid var(--orange);background:var(--ink);color:var(--orange);
  font-family:var(--font-mono);font-weight:700;font-size:.85rem;letter-spacing:.04em;
  box-shadow:4px 4px 0 rgba(255,106,26,.16);
}
.brand-text{display:flex;flex-direction:column;gap:.1rem;line-height:1.15}
.brand-name{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;font-size:1.15rem}
.brand-line{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;color:var(--muted)}

.utility-note{
  margin-right:auto;font-family:var(--font-mono);font-size:.72rem;
  letter-spacing:.08em;color:var(--muted);
}
.utility-dot{
  display:inline-block;width:8px;height:8px;margin-inline:.5rem;vertical-align:middle;
  background:var(--cyan);border-radius:50%;box-shadow:0 0 0 4px rgba(22,213,200,.14);
  animation:pulse 3s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.32}}
.utility-actions{display:flex;align-items:center;gap:.85rem;flex-wrap:wrap}

/* tactics board */
.tactics{position:relative;display:flex;align-items:stretch;border:2px solid var(--orange);background:rgba(255,106,26,.10);box-shadow:4px 4px 0 rgba(6,13,22,.85)}
.tactics-link{display:flex;flex-direction:column;justify-content:center;gap:.1rem;padding:.42rem .8rem;text-decoration:none;color:var(--text)}
.tactics-label{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em}
.tactics-code{font-family:var(--font-mono);font-weight:700;font-size:.95rem;color:var(--acid);font-variant-numeric:tabular-nums}
.tactics-toggle{display:grid;place-items:center;width:36px;border-left:1px solid rgba(255,106,26,.5);color:var(--orange)}
.tactics-toggle:hover{color:var(--acid)}
.tactics-caret{width:0;height:0;border-left:5px solid transparent;border-right:5px solid transparent;border-top:6px solid currentColor;transition:transform .2s ease}
.tactics[data-open="true"] .tactics-caret{transform:rotate(180deg)}
.tactics-panel{
  position:absolute;right:0;top:calc(100% + 10px);width:250px;z-index:70;
  background:var(--ink-2);border:2px solid var(--line);box-shadow:var(--shadow);
  padding:.85rem .9rem;opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
}
.tactics:hover .tactics-panel,
.tactics[data-open="true"] .tactics-panel{opacity:1;visibility:visible;transform:none}
.tactics-title{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;color:var(--acid);border-bottom:1px solid var(--line);padding-bottom:.5rem;margin-bottom:.5rem}
.tactics-list li a{
  display:block;padding:.4rem .5rem;text-decoration:none;font-size:.9rem;color:var(--muted);
  border-left:2px solid transparent;transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.tactics-list li a:hover,.tactics-list li a:focus-visible{color:var(--text);border-left-color:var(--cyan);background:rgba(22,213,200,.08)}

.header-cta{display:flex;gap:.5rem;flex-wrap:wrap}

/* nav tier */
.primary-nav{position:relative;background:var(--ink-3);border-bottom:2px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:1rem;min-height:56px}
.nav-toggle{
  display:none;align-items:center;gap:.6rem;border:2px solid var(--line);background:var(--ink-2);
  padding:.5rem .75rem;font-family:var(--font-mono);font-size:.76rem;letter-spacing:.08em;color:var(--text);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--acid)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle-bar{display:block;height:2px;width:100%;background:var(--orange)}
.nav-toggle-bar:nth-child(2){width:70%}
.nav-list{display:flex;align-items:stretch;gap:.15rem;flex:1;flex-wrap:wrap}
.nav-list a{
  display:inline-flex;align-items:baseline;gap:.45rem;
  padding:.75rem .85rem;text-decoration:none;font-size:.95rem;color:var(--muted);
  border-bottom:2px solid transparent;border-top:2px solid transparent;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.nav-list a:hover{color:var(--text);border-bottom-color:var(--cyan);background:rgba(22,213,200,.06)}
.nav-list a[aria-current="page"]{color:var(--text);border-bottom-color:var(--orange);background:rgba(255,106,26,.10)}
.nav-index{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.06em;color:var(--acid)}
.nav-meta{
  display:flex;align-items:center;gap:.45rem;margin-left:auto;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--muted);
}
.nav-clock{
  color:var(--acid);font-weight:700;font-size:.82rem;font-variant-numeric:tabular-nums;
  border:1px solid rgba(198,242,78,.42);padding:.1rem .42rem;
}
.scroll-meter{position:absolute;left:0;right:0;bottom:-2px;height:3px;overflow:hidden}
.scroll-meter__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--orange),var(--cyan) 55%,var(--acid));transition:width .12s linear}

/* ---------- footer ---------- */
.site-footer{position:relative;margin-top:auto;background:var(--abyss);border-top:1px solid var(--line)}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:4px;
  background:linear-gradient(90deg,var(--orange) 0 22%,var(--cyan) 22% 56%,var(--acid) 56% 76%,transparent 76%);
}
.footer-inner{
  display:grid;gap:2.25rem;
  grid-template-columns:minmax(0,1.3fr) repeat(3,minmax(0,1fr));
  padding-block:clamp(2.25rem,5vw,3.25rem) clamp(1.75rem,4vw,2.5rem);
}
.footer-brandline{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;font-size:1.2rem}
.footer-text{color:var(--muted);font-size:.94rem;margin-top:.6rem;max-width:38ch}
.footer-actions{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.25rem}
.footer-col-title{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;color:var(--acid);
  border-bottom:1px solid var(--line);padding-bottom:.55rem;margin-bottom:.65rem;font-weight:400;
}
.footer-list li a{
  display:inline-block;padding-block:.24rem;font-size:.93rem;color:var(--muted);text-decoration:none;
  border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease;
}
.footer-list li a:hover,.footer-list li a:focus-visible{color:var(--text);border-bottom-color:var(--cyan)}
.footer-base{
  display:grid;gap:.4rem;
  border-top:1px dashed var(--line);
  padding-block:1.35rem clamp(1.75rem,4vw,2.5rem);
  font-size:.82rem;color:var(--muted);
}
.footer-contact{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.04em;color:var(--muted)}
.footer-note{font-size:.78rem;color:rgba(159,176,196,.8);max-width:70ch}
.footer-legal{font-family:var(--font-mono);font-size:.76rem;letter-spacing:.04em}
.footer-icp{color:var(--acid)}

/* ---------- page basics ---------- */
.page-head{
  padding-block:clamp(2rem,5vw,3.5rem) clamp(1.5rem,3vw,2.5rem);
  border-bottom:1px solid var(--line);
}
.page-head__title{
  font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;
  font-size:clamp(2rem,6vw,4rem);line-height:1.02;margin-top:.75rem;
}
.page-head__sub{margin-top:1rem;color:var(--muted);max-width:64ch}
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.16em;color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--acid)}
.lede{font-size:1.05rem;color:var(--muted);max-width:62ch}

.section{padding-block:clamp(2.5rem,6vw,5rem)}
.section--tight{padding-block:clamp(1.5rem,3.5vw,2.5rem)}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:1.5rem;flex-wrap:wrap;
  border-bottom:2px solid var(--line);padding-bottom:.9rem;margin-bottom:1.75rem;
}
.section-title{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;font-size:clamp(1.5rem,3.4vw,2.3rem);line-height:1.15}

.grid{display:grid;gap:clamp(1rem,2.5vw,1.75rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.grid--aside{grid-template-columns:minmax(0,1fr)}
@media (min-width:1000px){.grid--aside{grid-template-columns:minmax(0,1fr) 270px;align-items:start}}

.prose{max-width:72ch}
.prose>*+*{margin-top:1.05rem}
.prose h2{
  font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;
  font-size:clamp(1.35rem,2.6vw,1.85rem);line-height:1.2;margin-top:2.25rem;padding-top:1rem;
  border-top:2px solid var(--line);
}
.prose h3{font-size:1.12rem;font-weight:700;margin-top:1.75rem}
.prose ul li{position:relative;padding-left:1.25rem;margin-top:.4rem}
.prose ul li::before{content:"";position:absolute;left:0;top:.78em;width:9px;height:2px;background:var(--cyan)}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--acid)}
.prose strong{color:#fff}

.card{
  border:2px solid var(--line);background:var(--ink-2);padding:clamp(1rem,2.4vw,1.5rem);
  box-shadow:var(--shadow-soft);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card:hover,.card:focus-within{transform:translateY(-2px);border-color:var(--cyan);box-shadow:var(--shadow)}
.card__title{font-family:var(--font-display);font-weight:800;letter-spacing:-.01em;font-size:1.12rem;line-height:1.35}
.card__meta{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;color:var(--muted);margin-top:.5rem}
.panel{border:1px solid var(--line);background:var(--ink-2);padding:clamp(.9rem,2vw,1.35rem)}

.scoreboard{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:1.1rem;align-items:center;
  border:2px solid var(--line);background:var(--ink-2);padding:1.05rem 1.2rem;box-shadow:var(--shadow-soft);
}
.scoreboard__score{
  font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;
  font-size:clamp(1.8rem,5vw,2.6rem);line-height:1;color:var(--orange);letter-spacing:-.02em;
}
.scoreboard__meta{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--muted)}

.data-bar{position:relative;height:10px;background:var(--ink-2);border:1px solid var(--line);overflow:hidden}
.data-bar__fill{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--acid));transition:width .4s ease}

.stat{display:flex;flex-direction:column;gap:.2rem;border-left:2px solid var(--line);padding-left:.9rem}
.stat__value{
  font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;
  font-size:clamp(1.5rem,3.6vw,2.1rem);line-height:1.05;color:var(--orange);
}
.stat__label{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;color:var(--muted)}

.steps{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));counter-reset:step}
.step{
  position:relative;border:2px solid var(--line);background:var(--ink-2);
  padding:1.25rem 1.1rem 1.1rem;box-shadow:var(--shadow-soft);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.step:hover{transform:translateY(-2px);border-color:var(--cyan);box-shadow:var(--shadow)}
.step::before{
  counter-increment:step;content:"0" counter(step);
  display:block;margin-bottom:.5rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--acid);
}
.step__title{font-family:var(--font-display);font-weight:800;letter-spacing:-.01em;font-size:1.08rem;margin-bottom:.35rem}
.step__text{color:var(--muted);font-size:.92rem;line-height:1.7}

.data-table{font-size:.94rem}
.data-table th{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--muted);
  text-align:left;padding:.7rem .8rem;border-bottom:2px solid var(--line);font-weight:400;
}
.data-table td{padding:.78rem .8rem;border-bottom:1px solid var(--line)}
.data-table tbody tr{transition:background .18s ease}
.data-table tbody tr:hover{background:rgba(22,213,200,.07)}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--orange);font-weight:700}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;
  padding:.2rem .5rem;border:1px solid var(--line);background:rgba(16,35,58,.7);color:var(--muted);
}
.tag--live{color:var(--acid);border-color:rgba(198,242,78,.5)}
.tag--cost{color:var(--orange);border-color:rgba(255,106,26,.5)}
.tag--cycle{color:var(--cyan);border-color:rgba(22,213,200,.5)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--muted);
}
.breadcrumbs li{display:inline-flex;align-items:center;gap:.45rem}
.breadcrumbs li+li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover{color:var(--cyan)}

.anchor-index{
  position:fixed;right:1.25rem;top:50%;transform:translateY(-50%);z-index:40;
  display:none;flex-direction:column;gap:.3rem;
  border-left:2px solid var(--line);padding-left:.8rem;
}
@media (min-width:1240px){.anchor-index{display:flex}}
.anchor-index a{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;
  color:var(--muted);text-decoration:none;padding:.12rem 0;
}
.anchor-index a:hover{color:var(--cyan)}
.anchor-index a[aria-current="true"]{color:var(--acid)}
.anchor-index a[aria-current="true"]::before{content:"▍";margin-right:.25rem;color:var(--orange)}

.media-frame{
  position:relative;overflow:hidden;border:2px solid var(--line);background:var(--ink-2);
  aspect-ratio:var(--ratio,16/9);width:100%;
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.88) contrast(1.08)}
.media-frame--wide{--ratio:21/9}
.media-frame--tall{--ratio:4/5}
.media-frame--square{--ratio:1/1}
.media-frame__watermark{
  position:absolute;right:.6rem;bottom:.6rem;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;color:var(--acid);
  background:rgba(6,13,22,.74);border:1px solid var(--line);padding:.15rem .45rem;
}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:1.7rem .9rem .7rem;font-size:.84rem;color:var(--text);
  background:linear-gradient(180deg,transparent,rgba(6,13,22,.94));
}

/* ---------- motion ---------- */
.has-js .reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.has-js .reveal.is-visible{opacity:1;transform:none}

/* ---------- breakpoints ---------- */
@media (max-width:1080px){
  .utility-note{display:none}
}
@media (max-width:979px){
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .header-cta .btn--ghost{display:none}
}
@media (max-width:899px){
  .nav-toggle{display:inline-flex}
  .nav-inner{flex-wrap:wrap;row-gap:.2rem;padding-block:.45rem}
  .nav-list{display:none;width:100%;grid-template-columns:repeat(2,minmax(0,1fr));gap:.1rem;padding-bottom:.9rem}
  .primary-nav[data-open="true"] .nav-list{display:grid}
  .primary-nav[data-open="true"] .nav-toggle{border-color:var(--acid);color:var(--acid)}
  .nav-list a{width:100%;border:1px solid var(--line);border-bottom-width:1px;background:var(--ink-2);padding:.6rem .7rem}
  .nav-list a:hover{border-color:var(--cyan)}
  .nav-list a[aria-current="page"]{border-color:var(--orange)}
  .nav-meta{order:3;margin-left:0;width:100%;justify-content:flex-start}
  .tactics-panel{right:auto;left:0;width:min(280px,84vw)}
}
@media (max-width:640px){
  body{font-size:16px}
  .utility-inner{min-height:64px;gap:.7rem}
  .brand-mark{width:40px;height:40px;font-size:.75rem}
  .brand-name{font-size:1.02rem}
  .brand-line{font-size:.62rem}
  .utility-actions{width:100%;gap:.55rem}
  .tactics{flex:1}
  .header-cta{flex:1}
  .header-cta .btn--primary{width:100%}
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .scoreboard{grid-template-columns:minmax(0,1fr)}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html{scroll-behavior:auto}
  .has-js .reveal{opacity:1;transform:none}
  .card:hover,.step:hover,.btn:hover{transform:none}
  .utility-dot{animation:none}
}