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

:root{
  --paper:#F4EFE6;
  --ink:#101317;
  --red:#C6152B;
  --red-deep:#7A0C1B;
  --blue:#16324F;
  --purple:#4A2B63;
  --cyan:#35E0D0;
  --orange:#FF7A1A;
  --gray:#8A8F98;

  --line:rgba(138,143,152,.30);
  --line-strong:rgba(16,19,23,.16);
  --line-light:rgba(244,239,230,.16);
  --on-dark:rgba(244,239,230,.78);
  --on-dark-dim:rgba(244,239,230,.55);

  --font-display:"Arial Black","Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-serif:Georgia,"Times New Roman","Songti SC","Noto Serif SC","SimSun",serif;
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --wrap:1280px;
  --gutter:clamp(16px,4vw,40px);
  --radius:2px;
  --t-fast:120ms;
  --t-mid:160ms;
  --shadow-1:0 1px 2px rgba(16,19,23,.05);
  --shadow-2:0 2px 12px -8px rgba(198,21,43,.55);
}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

img,svg{max-width:100%;display:block}
a{color:inherit}
button{font:inherit}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.08;
  letter-spacing:-.015em;
}

p{margin:0}
ul,ol{margin:0}

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

.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

#main-content{scroll-margin-top:96px}

.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  transform:translateY(-220%);
  padding:10px 18px;
  background:var(--red);
  color:#fff;
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  border-radius:var(--radius);
  transition:transform var(--t-mid) ease;
}
.skip-link:focus{transform:translateY(0)}

/* ================= HEADER ================= */

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink);
  color:var(--paper);
  transition:box-shadow var(--t-mid) ease;
}
.site-header::after{
  content:"";
  display:block;
  height:3px;
  background:linear-gradient(90deg,var(--red) 0 30%,var(--orange) 30% 38%,var(--cyan) 38% 46%,var(--blue) 46% 100%);
}
.site-header[data-scrolled="true"]{
  box-shadow:0 12px 26px -22px rgba(16,19,23,.95);
}

.header-inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
  min-height:72px;
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  transition:min-height var(--t-mid) ease;
}
.site-header[data-scrolled="true"] .header-inner{min-height:56px}

.brand{
  flex:0 0 auto;
  display:flex;
  align-items:baseline;
  gap:10px;
  padding-right:clamp(10px,2vw,20px);
  border-right:1px solid var(--line-light);
  color:var(--paper);
  text-decoration:none;
}
.brand-mark{
  font-family:var(--font-display);
  font-weight:900;
  font-size:22px;
  line-height:1;
  letter-spacing:.02em;
}
.brand-ver{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--on-dark-dim);
  white-space:nowrap;
}

.site-nav{
  flex:1 1 auto;
  display:flex;
  justify-content:flex-end;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(4px,1.4vw,22px);
  list-style:none;
  margin:0;
  padding:0;
}
.nav-item{display:block}
.nav-link{
  position:relative;
  display:inline-block;
  padding:10px 2px;
  color:rgba(244,239,230,.72);
  font-size:14px;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  transition:color var(--t-mid) ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:5px;
  height:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--t-mid) ease;
}
.nav-link:hover,.nav-link:focus-visible{color:#fff}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{
  color:#fff;
  font-weight:600;
}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--red);
}

.update-badge{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:8px;
  margin:0;
  padding:6px 12px;
  border:1px solid var(--line-light);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.02em;
  color:var(--on-dark);
  white-space:nowrap;
}
.badge-dot{
  flex:0 0 auto;
  width:7px;height:7px;
  border-radius:50%;
  background:var(--red);
  box-shadow:0 0 0 3px rgba(198,21,43,.22);
}

.nav-toggle{
  display:none;
  flex:0 0 auto;
  align-items:center;
  justify-content:center;
  width:42px;height:42px;
  margin-left:auto;
  padding:0;
  background:transparent;
  border:1px solid var(--line-light);
  border-radius:var(--radius);
  color:var(--paper);
  cursor:pointer;
  transition:border-color var(--t-mid) ease,background-color var(--t-mid) ease;
}
.nav-toggle:hover{border-color:var(--red);background:rgba(198,21,43,.14)}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;height:12px;
}
.nav-toggle-bars span{
  position:absolute;
  left:0;right:0;
  height:2px;
  background:currentColor;
  transition:transform var(--t-fast) ease,opacity var(--t-fast) ease;
}
.nav-toggle-bars span:nth-child(1){top:0}
.nav-toggle-bars span:nth-child(2){top:5px}
.nav-toggle-bars span:nth-child(3){top:10px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

@media (max-width:1180px){
  .brand-ver{display:none}
  .brand{padding-right:12px}
}
@media (max-width:1080px){
  .update-badge{display:none}
}
@media (max-width:960px){
  .header-inner{min-height:60px}
  .site-header[data-scrolled="true"] .header-inner{min-height:60px}
  .brand{padding-right:0;border-right:0}
  .nav-toggle{display:inline-flex;position:relative;z-index:95}
  .site-nav{
    position:fixed;
    inset:0;
    z-index:90;
    display:block;
    padding:calc(78px + env(safe-area-inset-top,0px)) var(--gutter) 48px;
    background:var(--ink);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-6px);
    transition:opacity var(--t-mid) ease,transform var(--t-mid) ease,visibility var(--t-mid) linear;
  }
  .site-nav[data-open="true"]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .nav-list{display:block}
  .nav-item{border-bottom:1px solid var(--line-light)}
  .nav-link{
    display:block;
    padding:18px 0 18px 24px;
    font-family:var(--font-serif);
    font-size:22px;
    letter-spacing:.02em;
    color:var(--paper);
  }
  .nav-link::after{display:none}
  .nav-link::before{
    content:"";
    position:absolute;
    left:0;top:50%;
    width:8px;height:8px;
    margin-top:-4px;
    border:1px solid var(--line-light);
    border-radius:50%;
    transition:background-color var(--t-fast) ease,border-color var(--t-fast) ease;
  }
  .nav-link:hover::before,.nav-link:focus-visible::before{border-color:var(--orange)}
  .nav-link[aria-current="page"]{color:#fff}
  .nav-link[aria-current="page"]::before{
    background:var(--red);
    border-color:var(--red);
  }
}

/* ================= FOOTER ================= */

.site-footer{
  background:var(--ink);
  color:var(--paper);
}
.footer-inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(40px,6vw,72px) var(--gutter) clamp(28px,4vw,40px);
}
.footer-top{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:12px 24px;
  padding-bottom:26px;
  border-bottom:1px solid var(--line-light);
}
.footer-brand{
  display:flex;
  align-items:baseline;
  gap:12px;
  margin:0;
}
.footer-brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:26px;
  line-height:1;
  letter-spacing:.02em;
  color:var(--paper);
}
.footer-brand-ver{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--on-dark-dim);
}
.footer-domain{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--on-dark-dim);
}

.footer-grid{
  display:grid;
  grid-template-columns:1.05fr 1fr 1.6fr;
  gap:clamp(24px,4vw,56px);
  padding-top:clamp(28px,4vw,44px);
}
.footer-col{min-width:0}
.footer-title{
  margin:0 0 16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line-light);
  font-family:var(--font-serif);
  font-size:14px;
  font-weight:400;
  letter-spacing:.14em;
  color:var(--cyan);
}
.footer-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:9px;
}
.footer-list a{
  position:relative;
  display:inline-block;
  color:var(--on-dark);
  font-size:15px;
  text-decoration:none;
  transition:color var(--t-mid) ease;
}
.footer-list a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:1px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--t-mid) ease;
}
.footer-list a:hover,.footer-list a:focus-visible{color:#fff}
.footer-list a:hover::after,.footer-list a:focus-visible::after{transform:scaleX(1)}

.footer-meta-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:10px;
}
.footer-meta-list li{
  display:flex;
  align-items:baseline;
  gap:12px;
}
.meta-key{
  flex:0 0 auto;
  width:40px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:rgba(244,239,230,.45);
}
.meta-val{
  min-width:0;
  font-size:13.5px;
  line-height:1.6;
  color:var(--on-dark);
  word-break:break-word;
}
.meta-val.is-numeric{
  font-family:var(--font-mono);
  font-weight:600;
  font-variant-numeric:tabular-nums;
  letter-spacing:.01em;
}

.footer-bottom{
  margin-top:clamp(28px,4vw,44px);
  padding-top:20px;
  border-top:1px solid var(--line-light);
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 28px;
}
.footer-note{
  margin:0;
  max-width:64ch;
  font-size:12.5px;
  line-height:1.7;
  color:var(--on-dark-dim);
}
.footer-copy{
  margin:0;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--on-dark-dim);
}

@media (max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col--meta{grid-column:1 / -1}
}
@media (max-width:600px){
  .footer-grid{grid-template-columns:1fr}
  .footer-col--meta{grid-column:auto}
  .footer-brand-name{font-size:22px}
}

/* ================= LAYOUT PRIMITIVES ================= */

.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}
.wrap--prose{max-width:720px}

.grid{display:grid;gap:clamp(16px,2.5vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}

@media (max-width:900px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:600px){
  .grid--3,.grid--2{grid-template-columns:1fr}
}

.band{
  position:relative;
  padding:clamp(36px,6vw,80px) 0;
  background:var(--ink);
  color:var(--paper);
}
.band--paper{background:var(--paper);color:var(--ink)}
.band--blue{background:var(--blue)}
.band--slant{
  clip-path:polygon(0 0,100% 3.2vw,100% 100%,0 calc(100% - 3.2vw));
}

/* ================= TYPOGRAPHY TOKENS ================= */

.display-xl{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(56px,9vw,120px);
  line-height:.92;
  letter-spacing:-.03em;
}
.display-lg{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(32px,4.4vw,56px);
  line-height:1;
  letter-spacing:-.025em;
}
.kicker{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--red);
}
.band .kicker,.card--dark .kicker,.card--blue .kicker{color:var(--cyan)}
.section-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-serif);
  font-size:19px;
  font-weight:400;
  line-height:1.4;
  letter-spacing:.04em;
  color:var(--ink);
}
.section-label::before{
  content:"";
  flex:0 0 auto;
  width:22px;
  height:2px;
  background:var(--red);
}
.band .section-label,.card--dark .section-label,.card--blue .section-label{color:var(--paper)}
.band .section-label::before,.card--dark .section-label::before,.card--blue .section-label::before{background:var(--cyan)}

.num{
  font-family:var(--font-mono);
  font-weight:600;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}

.prose{
  max-width:40em;
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
}
.prose p+p{margin-top:1.15em}
.prose h2{
  font-family:var(--font-display);
  font-size:clamp(24px,2.6vw,32px);
  margin:2.2em 0 .7em;
}
.prose h3{
  font-family:var(--font-serif);
  font-size:22px;
  font-weight:400;
  letter-spacing:.03em;
  margin:1.8em 0 .6em;
}
.prose ul,.prose ol{padding-left:1.2em;margin:1em 0}
.prose li+li{margin-top:.4em}
.prose a{
  color:var(--red);
  text-decoration:none;
  border-bottom:1px solid rgba(198,21,43,.35);
  transition:color var(--t-mid) ease,border-color var(--t-mid) ease;
}
.prose a:hover,.prose a:focus-visible{
  color:var(--orange);
  border-bottom-color:var(--orange);
}

/* ================= INDEX / RULES ================= */

.index-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px;
  padding:10px 0;
  border-top:1px solid var(--line-strong);
  border-bottom:1px solid var(--line-strong);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--gray);
}
.band .index-bar,.card--dark .index-bar,.card--blue .index-bar{
  border-color:var(--line-light);
  color:var(--on-dark-dim);
}
.index-num{
  font-family:var(--font-mono);
  font-weight:700;
  color:var(--red);
}
.band .index-num,.card--dark .index-num,.card--blue .index-num{color:var(--cyan)}

.rule{
  height:1px;
  margin:0;
  border:0;
  background:var(--line-strong);
}
.rule--light{background:var(--line-light)}

/* ================= CARDS ================= */

.card{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  background:#FBF8F2;
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-1);
  transition:border-color var(--t-mid) ease,box-shadow var(--t-mid) ease;
}
.card:hover,.card:focus-within{
  border-color:var(--red);
  box-shadow:var(--shadow-2);
}
.card--dark{
  background:var(--ink);
  border-color:var(--line-light);
  color:var(--paper);
}
.card--dark:hover,.card--dark:focus-within{
  border-color:var(--cyan);
  box-shadow:0 2px 14px -10px rgba(53,224,208,.7);
}
.card--blue{
  background:var(--blue);
  border-color:rgba(244,239,230,.16);
  color:var(--paper);
}
.card--blue:hover,.card--blue:focus-within{
  border-color:var(--orange);
  box-shadow:0 2px 14px -10px rgba(255,122,26,.7);
}

/* ================= BUTTONS & TAGS ================= */

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background-color var(--t-mid) ease,color var(--t-mid) ease,border-color var(--t-mid) ease;
}
.btn--primary{
  background:var(--red);
  color:#fff;
}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--red-deep)}
.btn--ghost{
  background:transparent;
  color:var(--ink);
  border-color:var(--line-strong);
}
.btn--ghost::after{
  content:"→";
  transition:transform var(--t-mid) ease;
}
.btn--ghost:hover,.btn--ghost:focus-visible{
  color:var(--red);
  border-color:var(--red);
}
.btn--ghost:hover::after,.btn--ghost:focus-visible::after{transform:translateX(4px)}
.btn--invert{
  background:transparent;
  color:var(--paper);
  border-color:var(--line-light);
}
.btn--invert::after{
  content:"→";
  transition:transform var(--t-mid) ease;
}
.btn--invert:hover,.btn--invert:focus-visible{
  color:var(--cyan);
  border-color:var(--cyan);
}
.btn--invert:hover::after,.btn--invert:focus-visible::after{transform:translateX(4px)}

.tag{
  display:inline-flex;
  align-items:center;
  padding:7px 13px;
  background:transparent;
  border:1px solid var(--line-strong);
  border-radius:999px;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:13px;
  line-height:1;
  text-decoration:none;
  cursor:pointer;
  transition:background-color var(--t-fast) ease,color var(--t-fast) ease,border-color var(--t-fast) ease;
}
.tag:hover{border-color:var(--red);color:var(--red)}
.tag[aria-pressed="true"],.tag.is-active{
  background:var(--ink);
  border-color:var(--ink);
  color:var(--paper);
}
.tag--invert{
  border-color:var(--line-light);
  color:var(--on-dark);
}
.tag--invert:hover{border-color:var(--cyan);color:var(--cyan)}
.tag--invert[aria-pressed="true"],.tag--invert.is-active{
  background:var(--paper);
  border-color:var(--paper);
  color:var(--ink);
}

/* ================= BREADCRUMB ================= */

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--gray);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:rgba(138,143,152,.6)}
.breadcrumb a{
  color:var(--gray);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--t-mid) ease,border-color var(--t-mid) ease;
}
.breadcrumb a:hover,.breadcrumb a:focus-visible{
  color:var(--orange);
  border-bottom-color:var(--orange);
}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ================= MEDIA SHELL ================= */

.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 10;
  background:linear-gradient(140deg,var(--blue) 0%,var(--purple) 55%,var(--ink) 100%);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.media > img{
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center 30%;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(160deg,rgba(198,21,43,.34) 0%,rgba(16,19,23,0) 46%,rgba(16,19,23,.58) 100%);
}
.media--wide{aspect-ratio:21 / 9}
.media--square{aspect-ratio:1 / 1}
.media--portrait{aspect-ratio:3 / 4}
.media--flat::after{background:none}

.media-caption{
  display:block;
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--gray);
}
.band .media-caption,.card--dark .media-caption,.card--blue .media-caption{color:var(--on-dark-dim)}

/* ================= MEASURE BAR ================= */

.measure{
  display:flex;
  align-items:center;
  gap:12px;
}
.measure-track{
  position:relative;
  flex:1 1 auto;
  height:8px;
  background:rgba(138,143,152,.22);
  border-radius:2px;
  overflow:hidden;
}
.measure-fill{
  display:block;
  height:100%;
  width:var(--v,40%);
  background:var(--red);
  transform-origin:left center;
  transform:scaleX(1);
}
.measure-value{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-weight:600;
  font-size:14px;
  font-variant-numeric:tabular-nums;
  color:var(--ink);
}
.measure--invert .measure-track{background:rgba(244,239,230,.16)}
.measure--invert .measure-fill{background:var(--cyan)}
.measure--invert .measure-value{color:var(--cyan)}
.band .measure-track,.card--dark .measure-track{background:rgba(244,239,230,.16)}
.band .measure-fill,.card--dark .measure-fill{background:var(--cyan)}
.band .measure-value,.card--dark .measure-value{color:var(--cyan)}

.has-js [data-measure] .measure-fill{
  transform:scaleX(0);
  transition:transform 420ms cubic-bezier(.22,.68,.28,1);
}
.has-js [data-measure].is-measured .measure-fill{transform:scaleX(1)}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-measure] .measure-fill{transform:scaleX(1)}
}