*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:#F5F2EA;
  color:#0C1720;
  font-family:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{max-width:100%;display:block}
h1,h2,h3,h4,p,figure,ul,ol{margin:0}
ul,ol{padding:0}
button{font:inherit;color:inherit}
a{color:inherit}
:focus-visible{outline:2px solid #0E8C55;outline-offset:3px}
::selection{background:#FFD02E;color:#0C1720}

:root{
  --paper:#F5F2EA;
  --card:#FFFFFF;
  --ink:#0C1720;
  --ink-2:#1B2C39;
  --green:#0E8C55;
  --green-bright:#23C57C;
  --green-deep:#073A25;
  --whistle:#FFD02E;
  --red-card:#D8342A;
  --amber:#F0A81E;
  --grid:#C6CCC7;
  --on-dark:rgba(245,242,234,.82);
  --on-dark-dim:rgba(245,242,234,.6);
  --shell:1280px;
  --tick:72px;
  --serif:"Noto Serif SC","Songti SC","Source Han Serif SC",Georgia,"SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"IBM Plex Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}

h1,h2,h3,h4{font-family:var(--serif);font-weight:900;letter-spacing:-.02em;line-height:1.16;text-wrap:balance}
p{text-wrap:pretty}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:12px;top:-72px;z-index:999;
  background:#FFD02E;color:#0C1720;
  padding:10px 18px;font-size:14px;font-weight:600;
  text-decoration:none;border:1px solid #0C1720;
  transition:top .16s ease-out;
}
.skip-link:focus{top:12px}

/* ---------- header ---------- */
.ledger-head{
  position:sticky;top:0;z-index:80;
  background:var(--paper);
  border-bottom:1px solid var(--grid);
  isolation:isolate;
}
.ledger-head::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:repeating-linear-gradient(to bottom,rgba(12,23,32,.05) 0 1px,transparent 1px 26px);
}
.ledger-head__inner{
  position:relative;z-index:2;
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:16px clamp(16px,4vw,40px);
  min-height:78px;
  display:flex;align-items:center;gap:14px 20px;
  flex-wrap:nowrap;
  transition:min-height .18s ease-out,padding .18s ease-out;
}
.ledger-head[data-stuck="true"] .ledger-head__inner{min-height:60px;padding-top:8px;padding-bottom:8px}
.ledger-head[data-stuck="true"] .brand__meta{display:none}

.brand{
  display:flex;flex-direction:column;gap:4px;
  text-decoration:none;color:var(--ink);
  flex:0 0 auto;
}
.brand__word{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--serif);font-weight:900;font-size:26px;
  letter-spacing:.02em;line-height:1;
}
.brand__dot{width:9px;height:9px;background:var(--whistle);display:inline-block;flex:0 0 auto}
.brand__meta{
  font-family:var(--mono);font-size:11px;line-height:1.4;
  letter-spacing:.12em;color:var(--green);
}

.nav{margin-left:auto;display:flex;align-items:center}
.nav__list{
  display:flex;align-items:center;gap:clamp(12px,1.8vw,26px);
  list-style:none;margin:0;padding:0;
}
.nav__item{list-style:none}
.nav__link{
  position:relative;display:inline-flex;align-items:center;gap:6px;
  padding:6px 0;font-size:15px;font-weight:500;
  color:var(--ink);text-decoration:none;white-space:nowrap;
  transition:color .16s ease-out;
}
.nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:var(--green);transform:scaleX(0);transform-origin:left;
  transition:transform .18s ease-out;
}
.nav__link:hover::after,.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--green)}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav__flag{width:6px;height:6px;background:var(--amber);display:inline-block;flex:0 0 auto}
.nav__item--cta{display:none}
.nav__cta{
  display:inline-flex;align-items:center;justify-content:center;
  width:100%;margin-top:18px;padding:12px 16px;
  background:var(--whistle);border:1px solid var(--ink);
  color:var(--ink);font-size:15px;font-weight:600;text-decoration:none;
}

.head-cta{
  flex:0 0 auto;
  display:inline-flex;align-items:center;
  padding:10px 16px;
  background:var(--ink);color:var(--paper);
  font-size:14px;font-weight:500;text-decoration:none;white-space:nowrap;
  border:1px solid var(--ink);
  transition:background .16s ease-out,color .16s ease-out;
}
.head-cta:hover,.head-cta:focus-visible{background:var(--whistle);color:var(--ink)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;background:transparent;
  border:1px solid var(--ink);color:var(--ink);
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  cursor:pointer;
  transition:background .16s ease-out,color .16s ease-out;
}
.nav-toggle:hover,.nav-toggle:focus-visible{background:var(--ink);color:var(--paper)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars span{display:block;height:2px;background:currentColor;transition:transform .16s ease-out,opacity .16s ease-out}
.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)}
.nav-toggle__label{line-height:1}

.read-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;z-index:3;
  background:rgba(198,204,199,.55);
  pointer-events:none;
}
.read-progress__bar{
  display:block;height:100%;width:0;
  background:var(--green-bright);
  transition:width .12s linear;
}

/* ---------- footer ---------- */
.ledger-foot{
  position:relative;
  background:var(--green-deep);
  color:var(--on-dark);
  border-top:3px solid var(--green);
}
.ledger-foot__inner{
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:clamp(40px,6vw,72px) clamp(16px,4vw,40px) clamp(28px,4vw,40px);
  display:grid;
  grid-template-columns:minmax(220px,1fr) minmax(0,2.4fr);
  gap:clamp(28px,5vw,64px);
  align-items:start;
}
.foot-brand{display:block}
.foot-word{
  font-family:var(--serif);font-weight:900;font-size:24px;
  letter-spacing:.02em;color:var(--paper);line-height:1.2;
}
.foot-motto{
  margin-top:14px;max-width:22em;
  font-size:14px;line-height:1.9;color:var(--on-dark);
}
.foot-sign{
  margin-top:16px;font-size:11px;letter-spacing:.16em;
  color:var(--whistle);
}
.foot-cols{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(18px,2.4vw,32px);
}
.foot-col{min-width:0}
.foot-col__title{
  margin:0 0 14px;padding-bottom:10px;
  border-bottom:1px solid rgba(245,242,234,.2);
  font-family:var(--mono);font-size:12px;font-weight:600;
  letter-spacing:.14em;color:var(--whistle);
  line-height:1.5;
}
.foot-list{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.foot-list li{font-size:13px;line-height:1.6;color:var(--on-dark-dim)}
.foot-list a{
  color:var(--on-dark);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease-out,border-color .16s ease-out;
}
.foot-list a:hover,.foot-list a:focus-visible{color:var(--whistle);border-bottom-color:var(--whistle)}

.ledger-foot__contact{
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:22px clamp(16px,4vw,40px);
  border-top:1px solid rgba(245,242,234,.16);
  display:flex;flex-wrap:wrap;gap:10px 28px;
  font-size:13px;line-height:1.7;color:var(--on-dark-dim);
}
.foot-contact__item{display:inline-flex;flex-wrap:wrap;gap:6px}
.foot-contact__item .mono{color:var(--whistle);font-size:12px;letter-spacing:.04em}
.foot-contact__note{
  flex-basis:100%;max-width:62em;
  font-size:13px;line-height:1.8;color:var(--on-dark-dim);
}
.ledger-foot__legal{
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:16px clamp(16px,4vw,40px) clamp(32px,5vw,48px);
  border-top:1px solid rgba(245,242,234,.12);
  display:flex;flex-wrap:wrap;gap:8px 24px;
  align-items:center;justify-content:space-between;
  font-size:11px;letter-spacing:.06em;color:rgba(245,242,234,.5);
}

/* ---------- layout & utilities ---------- */
.shell{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:clamp(16px,4vw,40px);
}
.grid-12{
  display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.span-4{grid-column:span 4}
.span-6{grid-column:span 6}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:12px;letter-spacing:.16em;
  color:var(--green);text-transform:uppercase;
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--green);display:block}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 20px;border:1px solid var(--ink);
  background:transparent;color:var(--ink);
  font-size:15px;font-weight:500;text-decoration:none;
  border-radius:0;cursor:pointer;
  transition:background .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.btn--whistle{background:var(--whistle);border-color:var(--whistle);color:var(--ink);font-weight:600}
.btn--whistle:hover,.btn--whistle:focus-visible{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:var(--ink);color:var(--paper)}

/* ---------- breadcrumb ---------- */
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  list-style:none;margin:0;padding:0;
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  color:var(--ink-2);
}
.crumb li{display:flex;align-items:center;gap:8px}
.crumb li+li::before{content:"/";color:var(--grid)}
.crumb a{color:var(--green);text-decoration:none;border-bottom:1px solid transparent}
.crumb a:hover,.crumb a:focus-visible{border-bottom-color:var(--green)}

/* ---------- prose ---------- */
.prose{max-width:38em}
.prose p{margin-bottom:1.1em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin:1.8em 0 .6em}
.prose ul,.prose ol{margin-bottom:1.1em;padding-left:1.4em}
.prose li{margin-bottom:.4em}
.prose a{color:var(--green);text-decoration:none;border-bottom:1px solid var(--green)}
.prose strong{font-weight:600;color:var(--ink)}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:6px 10px;border:1px solid var(--grid);
  background:var(--card);color:var(--ink-2);
  font-family:var(--mono);font-size:12px;line-height:1.2;letter-spacing:.04em;
  border-radius:0;text-decoration:none;
  transition:background .14s ease-out,color .14s ease-out,border-color .14s ease-out;
}
.tag:hover{border-color:var(--ink);color:var(--ink)}
.tag--selected,.tag[data-state="selected"]{background:var(--whistle);border-color:var(--whistle);color:var(--ink);font-weight:600}
.tag--amber{border-color:var(--amber);color:#8a5c00;background:rgba(240,168,30,.14)}
.tag--red{border-color:var(--red-card);color:var(--red-card);background:rgba(216,52,42,.08)}

/* ---------- sheet ---------- */
.sheet{
  background:var(--card);
  border:1px solid var(--grid);
  border-top:3px solid var(--green);
  padding:clamp(16px,2.2vw,26px);
  border-radius:0;
}
.sheet__head{
  display:flex;flex-wrap:wrap;gap:8px 12px;
  align-items:baseline;justify-content:space-between;
  margin-bottom:12px;padding-bottom:10px;
  border-bottom:1px solid var(--grid);
}
.sheet__title{
  margin:0;font-family:var(--serif);font-size:20px;font-weight:700;
  letter-spacing:-.01em;line-height:1.35;
}

/* ---------- media frame ---------- */
.frame-media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/10;
  background:var(--ink-2);
  border:1px solid var(--grid);
  border-radius:0;
}
.frame-media--wide{aspect-ratio:21/9}
.frame-media--tall{aspect-ratio:3/4}
.frame-media__img{display:block;width:100%;height:100%;object-fit:cover}
.frame-media__grid{
  position:absolute;inset:0;pointer-events:none;opacity:.45;
  background-image:
    linear-gradient(to right,rgba(245,242,234,.22) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(245,242,234,.22) 1px,transparent 1px);
  background-size:25% 33.333%;
}
.frame-media__caption{
  position:absolute;left:0;right:0;bottom:0;
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;
  padding:10px 12px;
  background:rgba(7,58,37,.88);
  border-top:1px solid rgba(245,242,234,.2);
  color:var(--paper);
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;
}

/* ---------- tick (chapter scale) ---------- */
.tick{
  display:flex;align-items:baseline;gap:10px;
  padding:8px 0 8px 12px;
  border-left:2px solid var(--grid);
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  color:var(--ink-2);text-decoration:none;
  transition:color .18s ease-out,border-color .18s ease-out;
}
.tick__num{font-weight:600;letter-spacing:.1em;color:inherit}
.tick[data-active="true"]{color:var(--green);border-left-color:var(--green-bright)}
.tick:hover{color:var(--green)}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .foot-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(20px,3vw,30px)}
}
@media (max-width:900px){
  body{font-size:16px}
  .ledger-head__inner{min-height:64px;padding-block:12px;gap:10px}
  .head-cta{display:none}
  .nav-toggle{display:inline-flex;margin-left:auto}
  .nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;margin-left:0;
    background:var(--paper);
    border-top:1px solid var(--grid);
    border-bottom:1px solid var(--ink);
    padding:6px clamp(16px,4vw,40px) 22px;
    max-height:76vh;overflow-y:auto;
  }
  .nav[data-open="true"]{display:block}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px solid var(--grid)}
  .nav__link{display:flex;padding:13px 0;font-size:17px}
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{color:var(--green);background:rgba(255,208,46,.26);padding-left:10px;padding-right:10px}
  .nav__item--cta{display:block;border-bottom:0}
  .ledger-foot__inner{grid-template-columns:1fr;gap:clamp(26px,5vw,40px)}
  .span-4,.span-6,.span-8{grid-column:span 12}
}
@media (max-width:600px){
  .brand__word{font-size:22px}
  .brand__meta{font-size:10px;letter-spacing:.08em}
  .foot-cols{grid-template-columns:1fr;gap:24px}
  .foot-word{font-size:21px}
  .ledger-foot__legal{flex-direction:column;align-items:flex-start;gap:6px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
}