*,*::before,*::after{box-sizing:border-box}

:root{
  --arena-base:#0E0F11;
  --panel:#17191D;
  --rock:#2A2D33;
  --terracotta:#8C5A3C;
  --moss:#5C7A5E;
  --chalk:#F3EDE3;
  --orange:#FF4D1C;
  --cyan:#22D3EE;
  --lime:#C6F24E;
  --alloy:#8A939E;

  --shell:min(1280px, 100% - 3rem);
  --shadow-hard:6px 6px 0 rgba(0,0,0,.55);

  --font-display:"Source Han Serif SC","Noto Serif CJK SC","Songti SC",SimSun,Georgia,"Times New Roman",serif;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:160px;
}

body{
  margin:0;
  min-height:100vh;
  background:var(--arena-base);
  color:var(--chalk);
  font-family:var(--font-sans);
  font-size:1rem;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(42,45,51,.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42,45,51,.4) 1px, transparent 1px);
  background-size:88px 88px;
  -webkit-mask-image:radial-gradient(circle at 50% 0%, #000 0%, rgba(0,0,0,.35) 45%, transparent 78%);
  mask-image:radial-gradient(circle at 50% 0%, #000 0%, rgba(0,0,0,.35) 45%, transparent 78%);
  opacity:.5;
}

img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure,blockquote{margin:0}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
}

main{display:block;position:relative;z-index:1}

/* ---------- Skip link ---------- */
.skip-link{
  position:absolute;
  left:1rem;
  top:-120px;
  z-index:400;
  padding:.7rem 1.1rem;
  background:var(--cyan);
  color:#04161B;
  font-weight:700;
  font-size:.85rem;
  letter-spacing:.06em;
  text-decoration:none;
  border:2px solid #04161B;
  transition:top .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{
  top:.75rem;
  outline:2px solid var(--chalk);
  outline-offset:2px;
}

/* ---------- Header ---------- */
.read-progress{
  position:fixed;
  inset:0 auto auto 0;
  width:0;
  height:3px;
  z-index:300;
  pointer-events:none;
  background:linear-gradient(90deg, var(--orange) 0%, var(--orange) 55%, var(--cyan) 100%);
  transition:width .1s linear;
}

.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(14,15,17,.96);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:3px solid var(--rock);
}

.masthead{
  width:var(--shell);
  margin:0 auto;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:1rem;
  padding:1.05rem 0 .9rem;
}

.masthead__brand{
  min-width:0;
  text-align:center;
}

.masthead__title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.5rem, 2.9vw, 2.35rem);
  line-height:1.06;
  letter-spacing:.16em;
  text-indent:.16em;
  color:var(--chalk);
  text-shadow:3px 3px 0 rgba(255,77,28,.22);
  white-space:nowrap;
}

.masthead__sub{
  margin-top:.5rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.3em;
  text-indent:.3em;
  color:var(--alloy);
}

.masthead__side{
  display:flex;
  align-items:center;
  gap:.6rem;
  min-width:0;
}
.masthead__side--right{justify-content:flex-end}

.masthead__issue{
  display:inline-block;
  padding-left:.6rem;
  border-left:3px solid var(--terracotta);
  font-family:var(--font-mono);
  font-size:.66rem;
  line-height:1.6;
  letter-spacing:.18em;
  color:var(--alloy);
}

.status-chip{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.34rem .68rem;
  border:2px solid var(--rock);
  background:var(--panel);
  color:var(--chalk);
  font-size:.75rem;
  letter-spacing:.08em;
  white-space:nowrap;
  box-shadow:3px 3px 0 rgba(0,0,0,.45);
}

.status-chip__dot{
  flex:none;
  width:8px;
  height:8px;
  background:var(--lime);
  box-shadow:0 0 0 3px rgba(198,242,78,.18);
  animation:statusPulse 2.6s ease-in-out infinite;
}

@keyframes statusPulse{
  0%,100%{opacity:1;box-shadow:0 0 0 3px rgba(198,242,78,.18)}
  50%{opacity:.5;box-shadow:0 0 0 6px rgba(198,242,78,.06)}
}

.nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:4px;
  width:44px;
  height:40px;
  padding:0;
  border:2px solid var(--rock);
  background:var(--panel);
  cursor:pointer;
  box-shadow:3px 3px 0 rgba(0,0,0,.45);
  transition:border-color .16s ease, background-color .16s ease;
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle__bar{
  display:block;
  width:20px;
  height:2px;
  background:var(--chalk);
  transition:transform .2s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"]{border-color:var(--orange)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- Index bar ---------- */
.index-bar{
  width:var(--shell);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:.35rem;
  min-height:56px;
  padding:.25rem 0 .3rem;
  border-top:1px solid rgba(42,45,51,.85);
}

.index-bar__list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.1rem;
}

.index-bar__item{flex:none}

.index-bar__link{
  display:inline-block;
  position:relative;
  padding:.5rem .8rem;
  font-size:.92rem;
  letter-spacing:.08em;
  color:var(--alloy);
  text-decoration:none;
  border-bottom:3px solid transparent;
  transition:color .18s ease, background-color .18s ease, border-color .18s ease;
}
.index-bar__link:hover{
  color:var(--chalk);
  background:rgba(42,45,51,.6);
}
.index-bar__link[aria-current="page"]{
  color:var(--chalk);
  border-bottom-color:var(--orange);
  background:linear-gradient(to top, rgba(255,77,28,.16), rgba(255,77,28,0));
}

.index-bar__actions{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:.5rem;
  padding-left:1rem;
}

.index-bar__status{display:none}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.4rem;
  padding:.5rem .95rem;
  border:2px solid var(--rock);
  background:var(--panel);
  color:var(--chalk);
  font-family:var(--font-sans);
  font-size:.82rem;
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.4;
  text-decoration:none;
  cursor:pointer;
  transition:transform .16s ease, box-shadow .16s ease, border-color .16s ease, background-color .16s ease, color .16s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:4px 4px 0 rgba(0,0,0,.6)}
.btn:active{transform:translate(0,0);box-shadow:none}

.btn--primary{
  background:var(--orange);
  border-color:var(--orange);
  color:#1A0904;
  box-shadow:4px 4px 0 rgba(42,45,51,.9);
}
.btn--primary:hover{box-shadow:6px 6px 0 rgba(42,45,51,.9)}

.btn--ghost{
  background:transparent;
  border-color:var(--rock);
  color:var(--alloy);
}
.btn--ghost:hover{color:var(--chalk);border-color:var(--cyan)}

.btn--cyan{
  background:transparent;
  border-color:var(--cyan);
  color:var(--cyan);
}
.btn--cyan:hover{background:rgba(34,211,238,.12);color:var(--chalk)}

.btn--block{width:100%}

/* ---------- Layout primitives ---------- */
.container{
  width:var(--shell);
  margin-inline:auto;
}
.container--narrow{
  width:min(820px, 100% - 3rem);
  margin-inline:auto;
}

.section{padding-block:3.25rem}
.section--tight{padding-block:2rem}

.section-head{
  display:flex;
  align-items:baseline;
  flex-wrap:wrap;
  gap:.85rem;
  margin-bottom:1.6rem;
  padding-bottom:.85rem;
  border-bottom:3px solid var(--rock);
}

.section-title{
  font-family:var(--font-sans);
  font-size:clamp(1.3rem, 2.4vw, 1.75rem);
  font-weight:800;
  letter-spacing:.1em;
  line-height:1.3;
  color:var(--chalk);
}

.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.24em;
  color:var(--cyan);
  text-transform:uppercase;
}

.lead{
  max-width:62ch;
  font-size:1.1rem;
  line-height:1.8;
  color:var(--chalk);
}

.grid{display:grid;gap:1.5rem}
.grid--split{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.grid--halves{grid-template-columns:repeat(2, minmax(0,1fr))}
.grid--thirds{grid-template-columns:repeat(3, minmax(0,1fr))}

.panel{
  padding:1.35rem;
  background:var(--panel);
  border:2px solid var(--rock);
  box-shadow:var(--shadow-hard);
}

.rule{
  height:3px;
  margin:2rem 0;
  border:0;
  background:var(--rock);
}

.tag{
  display:inline-block;
  padding:.22rem .55rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  background:var(--moss);
  border:1px solid var(--rock);
  color:var(--chalk);
  text-transform:uppercase;
}
.tag--orange{background:var(--orange);border-color:var(--orange);color:#170A05}
.tag--cyan{background:transparent;border-color:var(--cyan);color:var(--cyan)}

/* ---------- Breadcrumb ---------- */
.breadcrumb{
  width:var(--shell);
  margin:0 auto;
  padding:1.15rem 0 .2rem;
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.1em;
  color:var(--alloy);
}
.breadcrumb__item{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:var(--rock);
}
.breadcrumb__item a{
  color:var(--alloy);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease, border-color .16s ease;
}
.breadcrumb__item a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.breadcrumb__item[aria-current="page"]{color:var(--chalk)}

/* ---------- Media frame ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:3 / 2;
  background-color:#101215;
  background-image:repeating-linear-gradient(135deg, rgba(42,45,51,.85) 0 2px, rgba(16,18,21,0) 2px 14px);
  border:3px solid var(--rock);
  box-shadow:var(--shadow-hard);
  overflow:hidden;
}
.media-frame > img,
.media-frame > picture,
.media-frame > svg{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:16 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame__caption{
  margin-top:.6rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--alloy);
}

/* ---------- Prose ---------- */
.prose{
  max-width:68ch;
  font-size:1.05rem;
  line-height:1.8;
  color:var(--chalk);
}
.prose > * + *{margin-top:1.2em}
.prose p{margin:0}
.prose h2{
  margin-top:2em;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.45rem, 2.6vw, 1.9rem);
  letter-spacing:.03em;
  line-height:1.35;
}
.prose h3{
  margin-top:1.6em;
  font-family:var(--font-sans);
  font-weight:800;
  font-size:1.15rem;
  letter-spacing:.06em;
}
.prose a{
  color:var(--cyan);
  text-decoration:underline;
  text-underline-offset:3px;
}
.prose a:hover{color:var(--chalk)}
.prose ul,
.prose ol{
  margin-top:1.2em;
  padding-left:1.4em;
}
.prose ul{list-style:square}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.4em}
.prose code{
  padding:.1em .35em;
  font-family:var(--font-mono);
  font-size:.9em;
  background:var(--panel);
  border:1px solid var(--rock);
}
.prose blockquote{
  margin-top:1.5em;
  padding:1rem 1.2rem;
  border-left:4px solid var(--terracotta);
  background:var(--panel);
  font-family:var(--font-display);
  color:var(--chalk);
}

/* ---------- Footer ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:4.5rem;
  background:var(--panel);
  border-top:3px solid var(--rock);
  color:var(--chalk);
}

.site-footer__grid{
  width:var(--shell);
  margin-inline:auto;
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:2rem;
  padding:2.75rem 0 2.25rem;
}

.footer-brand__title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:1.45rem;
  letter-spacing:.14em;
  line-height:1.2;
  color:var(--chalk);
  text-shadow:3px 3px 0 rgba(255,77,28,.2);
}
.footer-brand__domain{
  margin-top:.45rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.12em;
  color:var(--cyan);
}
.footer-brand__meta{
  margin-top:1rem;
  display:grid;
  gap:.35rem;
  max-width:28ch;
  font-size:.82rem;
  line-height:1.7;
  color:var(--alloy);
}

.footer-col__title{
  margin-bottom:.8rem;
  padding-bottom:.55rem;
  border-bottom:2px solid var(--rock);
  font-family:var(--font-sans);
  font-size:.78rem;
  font-weight:800;
  letter-spacing:.22em;
  color:var(--chalk);
}
.footer-col__list{display:grid;gap:.45rem}
.footer-col__link{
  display:inline-block;
  font-size:.88rem;
  color:var(--alloy);
  text-decoration:none;
  transition:color .16s ease, transform .16s ease;
}
.footer-col__link:hover{
  color:var(--chalk);
  transform:translateX(2px);
}

.footer__bottom{
  width:var(--shell);
  margin-inline:auto;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:flex-start;
  gap:1rem 2rem;
  padding:1.2rem 0 2rem;
  border-top:1px solid var(--rock);
  font-size:.78rem;
  line-height:1.8;
  color:var(--alloy);
}

.footer__legal{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem 1.1rem;
}
.footer__legal-link{
  color:var(--alloy);
  text-decoration:none;
  padding-bottom:1px;
  border-bottom:1px solid var(--rock);
  transition:color .16s ease, border-color .16s ease;
}
.footer__legal-link:hover{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
}

.footer__meta{
  display:grid;
  gap:.3rem;
  max-width:54ch;
  font-size:.78rem;
}
.footer__meta p{margin:0}

/* ---------- Responsive ---------- */
@media (max-width:1120px){
  .site-footer__grid{grid-template-columns:1.4fr 1fr 1fr;gap:1.75rem}
}

@media (max-width:960px){
  :root{--shell:min(1280px, 100% - 2rem)}

  .masthead{
    grid-template-columns:1fr auto;
    gap:.75rem;
    padding:.85rem 0 .75rem;
  }
  .masthead__side--left{display:none}
  .masthead__brand{text-align:left}
  .masthead__title{
    font-size:clamp(1.3rem, 5.2vw, 1.8rem);
    letter-spacing:.1em;
    text-indent:.1em;
    white-space:normal;
  }
  .masthead__sub{
    margin-top:.35rem;
    font-size:.6rem;
    letter-spacing:.18em;
    text-indent:.18em;
  }
  .masthead__side--right{justify-content:flex-end}
  .status-chip{display:none}
  .nav-toggle{display:inline-flex}

  .index-bar{
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    min-height:0;
    max-height:calc(100vh - 96px);
    overflow-y:auto;
    padding:.25rem 0 1.1rem;
  }
  .index-bar[data-open="true"]{display:flex}

  .index-bar__list{
    flex-direction:column;
    align-items:stretch;
    flex-wrap:nowrap;
    width:100%;
  }
  .index-bar__item{width:100%}
  .index-bar__link{
    display:block;
    width:100%;
    padding:.75rem .5rem;
    font-size:1rem;
    border-bottom:2px solid var(--rock);
  }
  .index-bar__link[aria-current="page"]{
    padding-left:.9rem;
    background:rgba(255,77,28,.12);
    border-bottom-color:var(--orange);
  }
  .index-bar__status{
    display:flex;
    align-items:center;
    gap:.5rem;
    margin-top:1rem;
    font-family:var(--font-mono);
    font-size:.72rem;
    letter-spacing:.12em;
    color:var(--alloy);
  }
  .index-bar__actions{
    margin-left:0;
    padding-left:0;
    margin-top:1rem;
    flex-direction:column;
    gap:.6rem;
  }
  .index-bar__actions .btn{width:100%}

  .breadcrumb{padding-top:.9rem}
  html{scroll-padding-top:120px}
}

@media (max-width:900px){
  .grid--split,
  .grid--halves,
  .grid--thirds{grid-template-columns:1fr}

  .site-footer__grid{
    grid-template-columns:repeat(2, minmax(0,1fr));
    gap:1.75rem;
    padding:2.25rem 0 1.75rem;
  }
  .footer-brand{grid-column:1 / -1}
  .footer__bottom{flex-direction:column;gap:1rem}
}

@media (max-width:640px){
  body{font-size:.95rem}
  .section{padding-block:2.5rem}
  .lead{font-size:1rem}
  .panel{padding:1.1rem}
  .masthead__title{font-size:1.28rem;letter-spacing:.06em;text-indent:.06em}
  .site-footer__grid{grid-template-columns:1fr}
  .footer__meta{font-size:.74rem}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .read-progress{transition:none}
}