/* ===== 01 reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;margin:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse}

/* ===== 02 tokens ===== */
:root{
  --ink-900:#08152B;
  --ink-800:#0B1B36;
  --ink-700:#102346;
  --ink-600:#16305C;
  --paper:#F3E9D7;
  --paper-soft:#FBF5EA;
  --brown:#211813;
  --brown-soft:#5A4638;
  --orange:#FF6A2A;
  --cyan:#4DE8CF;
  --green:#3C9B67;
  --mute:#9DB0C8;
  --moon:#F7F4EE;
  --alert:#D84B32;
  --line:rgba(157,176,200,.20);
  --line-strong:rgba(157,176,200,.42);
  --shadow-1:0 18px 44px -34px rgba(0,0,0,.95);
  --font-display:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"DIN Condensed","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --wrap:1240px;
  --radius:2px;
}

/* ===== 03 base ===== */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  background:var(--ink-900);
  color:var(--moon);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.08;letter-spacing:-.01em;color:inherit}
h1{font-size:clamp(40px,6vw,96px);line-height:.98}
h2{font-size:clamp(28px,4.4vw,48px)}
h3{font-size:clamp(20px,2.4vw,26px);line-height:1.2}
p{max-width:70ch}
::selection{background:var(--orange);color:#0A1526}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:1px}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.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}
.skip-link{
  position:fixed;top:-80px;left:16px;z-index:120;
  padding:10px 18px;background:var(--cyan);color:#08152B;
  font-size:14px;font-weight:700;letter-spacing:.06em;
  border-radius:var(--radius);transition:top .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{top:14px;outline:2px solid var(--orange);outline-offset:2px}

/* ===== 04 layout ===== */
.wrap,.header-inner,.footer-inner{
  width:min(100% - 2.5rem,var(--wrap));
  margin-inline:auto;
}
.section{position:relative;padding-block:clamp(48px,7vw,104px)}
.section--paper{background:var(--paper);color:var(--brown)}
.section--paper .section-title{color:var(--brown)}
.section--paper .section-lede{color:var(--brown-soft)}
.section--paper .eyebrow{color:var(--alert)}
.section-head{display:grid;gap:14px;max-width:780px;margin-bottom:clamp(26px,4vw,52px)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor}
.section-title{font-size:clamp(28px,4.4vw,48px)}
.section-lede{font-size:clamp(16px,1.6vw,18px);color:var(--mute);max-width:64ch}
.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid-7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid-5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}

/* ===== 05 chapter / prose ===== */
.chapter{position:relative;border-top:1px solid var(--line);padding-block:clamp(34px,5vw,72px)}
.chapter::before{
  content:"";position:absolute;top:-1px;left:0;width:56px;height:1px;
  background:var(--cyan);opacity:.55;transition:width .35s ease,background-color .35s ease,opacity .35s ease;
}
.chapter.is-active::before{width:150px;background:var(--orange);opacity:1}
.chapter-index{
  display:block;font-family:var(--font-mono);font-size:clamp(30px,4.6vw,54px);
  line-height:1;letter-spacing:-.02em;color:rgba(157,176,200,.5);
  transition:transform .45s ease,color .3s ease;
}
.chapter.is-active .chapter-index{color:var(--orange);transform:translateY(-3px)}
.section--paper .chapter{border-top-color:rgba(33,24,19,.16)}
.section--paper .chapter-index{color:rgba(33,24,19,.35)}
.section--paper .chapter.is-active .chapter-index{color:var(--alert)}
.prose{max-width:760px}
.prose>*+*{margin-top:1.05em}
.prose h2{font-size:clamp(24px,3vw,34px);margin-top:1.8em}
.prose h3{font-size:19px;margin-top:1.6em;letter-spacing:.01em}
.prose ul,.prose ol{padding-left:1.35em;list-style:disc}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.4em}
.prose li::marker{color:var(--orange);font-family:var(--font-mono)}
.prose strong{color:var(--moon)}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.section--paper .prose strong{color:var(--brown)}
.section--paper .prose a{color:#0B6B5D;text-decoration-color:rgba(11,107,93,.45)}

/* ===== 06 media frame ===== */
.media-frame{
  position:relative;overflow:hidden;border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow-1);
  background:
    radial-gradient(120% 90% at 14% 8%,rgba(77,232,207,.16),transparent 60%),
    radial-gradient(100% 80% at 86% 92%,rgba(255,106,42,.14),transparent 62%),
    var(--ink-700);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(247,244,238,.05) 0 1px,transparent 1px 4px);
}
.media-frame img,.media-frame picture,.media-frame video{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--cine{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--fill{aspect-ratio:auto;height:100%}
.section--paper .media-frame{border-color:rgba(33,24,19,.18)}

/* ===== 07 panel / chip / stat / breadcrumbs ===== */
.panel{
  background:var(--ink-700);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow-1);
  padding:clamp(18px,2.4vw,30px);
}
.panel--paper{background:var(--paper-soft);border-color:rgba(33,24,19,.16);color:var(--brown);box-shadow:0 14px 34px -30px rgba(33,24,19,.9)}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:0 15px;
  border:1px solid var(--line-strong);border-radius:999px;
  background:rgba(16,35,70,.55);color:var(--mute);
  font-size:14px;letter-spacing:.02em;cursor:pointer;
  transition:border-color .18s ease,color .18s ease,background-color .18s ease,transform .18s ease;
}
.chip:hover{border-color:var(--cyan);color:var(--moon);transform:translateY(-2px)}
.chip[aria-pressed="true"]{border-color:var(--orange);color:var(--moon);background:rgba(255,106,42,.16)}
.chip[aria-pressed="true"]::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange);flex:0 0 auto}
.stat-row{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);
}
.stat{background:var(--ink-800);padding:18px 16px}
.stat-value{display:block;font-family:var(--font-mono);font-size:clamp(26px,3.4vw,40px);line-height:1;color:var(--cyan);font-weight:700}
.stat-label{display:block;margin-top:8px;font-size:13px;letter-spacing:.06em;color:var(--mute)}
.section--paper .stat-row{background:rgba(33,24,19,.16);border-color:rgba(33,24,19,.16)}
.section--paper .stat{background:var(--paper-soft)}
.section--paper .stat-value{color:#0B6B5D}
.section--paper .stat-label{color:var(--brown-soft)}
.breadcrumbs{margin-block:0 20px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--mute)}
.breadcrumb-item{display:inline-flex;align-items:center;gap:6px}
.breadcrumb-item+.breadcrumb-item::before{content:"/";color:var(--line-strong)}
.breadcrumb-item[aria-current="page"]{color:var(--moon)}
.breadcrumb-link{color:var(--cyan);border-bottom:1px solid transparent;transition:border-color .18s ease}
.breadcrumb-link:hover{border-bottom-color:var(--cyan)}
.section--paper .breadcrumb-list{color:var(--brown-soft)}
.section--paper .breadcrumb-item[aria-current="page"]{color:var(--brown)}

/* ===== 08 buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:40px;padding:0 16px;border:1px solid transparent;border-radius:var(--radius);
  font-family:var(--font-body);font-size:14px;font-weight:600;letter-spacing:.04em;
  text-decoration:none;cursor:pointer;white-space:nowrap;
  transition:transform .18s ease,background-color .18s ease,border-color .18s ease,color .18s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn-signal{background:var(--orange);color:#14100D;box-shadow:0 10px 24px -18px var(--orange)}
.btn-signal:hover{background:#FF8149}
.btn-ghost{border-color:var(--line-strong);color:var(--moon)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-cyan{border-color:rgba(77,232,207,.5);color:var(--cyan);background:rgba(77,232,207,.08)}
.btn-cyan:hover{background:rgba(77,232,207,.16);border-color:var(--cyan)}

/* ===== 09 header ===== */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(8,21,43,.94);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  color:var(--moon);
}
.masthead{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto auto;
  align-items:center;gap:clamp(12px,2vw,34px);
  min-height:74px;padding-block:10px;
}
.brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;color:var(--moon)}
.brand-bars{display:flex;align-items:flex-end;gap:3px;height:24px;flex:0 0 auto}
.brand-bar{display:block;width:4px;background:var(--cyan);transition:height .22s ease,background-color .22s ease}
.brand-bar:nth-child(1){height:14px;background:var(--orange)}
.brand-bar:nth-child(2){height:24px}
.brand-bar:nth-child(3){height:9px;background:var(--mute)}
.brand:hover .brand-bar:nth-child(1){height:24px}
.brand:hover .brand-bar:nth-child(3){height:17px;background:var(--cyan)}
.brand-text{display:grid;line-height:1.2;gap:2px}
.brand-name{font-family:var(--font-display);font-size:17px;font-weight:800;letter-spacing:.03em;color:var(--moon)}
.brand-line{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--mute)}
.header-context{
  display:flex;align-items:center;gap:10px;min-width:0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--mute);white-space:nowrap;overflow:hidden;
}
.context-dot{
  flex:0 0 auto;width:7px;height:7px;border-radius:50%;background:var(--green);
  box-shadow:0 0 0 3px rgba(60,155,103,.2);
  animation:j9-pulse 2.6s ease-in-out infinite;
}
@keyframes j9-pulse{0%,100%{opacity:1;box-shadow:0 0 0 3px rgba(60,155,103,.2)}50%{opacity:.55;box-shadow:0 0 0 6px rgba(60,155,103,0)}}
.header-actions{display:flex;align-items:center;gap:10px}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  min-height:40px;padding:0 11px;
  border:1px solid var(--line-strong);border-radius:var(--radius);
  color:var(--moon);font-size:13px;letter-spacing:.1em;cursor:pointer;
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars>span{display:block;height:2px;background:var(--cyan);transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars>span:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}
.nav-toggle-label{font-family:var(--font-mono);font-size:12px}
.site-nav{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  border-top:1px solid var(--line);
}
.nav-list{display:flex;flex-wrap:wrap;align-items:center;gap:clamp(4px,1.6vw,24px)}
.nav-item{display:block}
.nav-link{
  display:inline-flex;align-items:baseline;gap:7px;
  padding:14px 2px 12px;
  font-size:15px;letter-spacing:.02em;color:var(--mute);
  border-bottom:2px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.nav-link:hover{color:var(--moon);border-bottom-color:var(--line-strong)}
.nav-link[aria-current="page"]{color:var(--moon);border-bottom-color:var(--orange)}
.nav-index{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--cyan)}
.nav-link[aria-current="page"] .nav-index{color:var(--orange)}
.nav-status{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--mute);white-space:nowrap;
}
.status-dot{width:6px;height:6px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(60,155,103,.18)}
.read-progress{position:relative;height:2px;background:rgba(157,176,200,.18);overflow:hidden}
.read-progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--orange) 0%,var(--cyan) 100%);
  transition:transform .12s linear;
}

/* ===== 10 footer ===== */
.site-footer{background:var(--ink-800);color:var(--mute);border-top:1px solid var(--line)}
.footer-console{position:relative}
.footer-inner{
  display:grid;grid-template-columns:minmax(250px,1fr) minmax(0,1.45fr);
  gap:clamp(28px,4vw,64px);
  padding-block:clamp(36px,5vw,68px);
}
.footer-brand{display:grid;gap:16px;align-content:start}
.brand--footer .brand-name{font-size:17px}
.brand--footer .brand-line{color:var(--mute)}
.footer-summary{font-size:15px;line-height:1.8;color:var(--mute);max-width:42ch}
.footer-contact{display:grid;gap:6px;font-size:14px;line-height:1.7}
.contact-line{display:flex;gap:10px;align-items:baseline;color:var(--moon);max-width:none}
.contact-k{
  flex:0 0 auto;min-width:38px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--cyan);
}
.contact-note{margin-top:6px;font-size:12px;line-height:1.75;color:rgba(157,176,200,.78);max-width:48ch}
.footer-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,2.4vw,32px)}
.footer-col{display:grid;gap:12px;align-content:start}
.footer-col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.2em;
  text-transform:uppercase;color:var(--moon);
  padding-bottom:8px;border-bottom:1px solid var(--line);
}
.footer-list{display:grid;gap:8px}
.footer-link{
  display:inline-block;font-size:14px;color:var(--mute);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease,transform .18s ease;
}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--cyan);transform:translateX(2px)}
.footer-col--meter .footer-list{gap:10px}
.footer-pace{display:flex;align-items:baseline;gap:9px;font-size:13px;color:var(--mute)}
.pace-num{
  flex:0 0 auto;min-width:44px;
  font-size:12px;letter-spacing:.06em;color:var(--orange);
}
.footer-meter{
  height:22px;
  border-top:1px solid var(--line);
  background-image:
    repeating-linear-gradient(90deg,var(--line-strong) 0 1px,transparent 1px 28px),
    repeating-linear-gradient(90deg,rgba(157,176,200,.35) 0 1px,transparent 1px 7px);
  background-size:auto 100%,auto 45%;
  background-position:0 0,0 100%;
  background-repeat:repeat-x;
  opacity:.7;
}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 26px;
  border-top:1px solid var(--line);
  padding-block:18px;
  padding-inline:max(1.25rem,calc((100% - var(--wrap)) / 2));
  font-size:12px;letter-spacing:.05em;
}
.legal-copy,.legal-icp{font-family:var(--font-mono);color:rgba(157,176,200,.82);max-width:none}
.legal-links{display:flex;flex-wrap:wrap;align-items:center;gap:6px 18px}
.legal-link{
  font-size:12px;color:var(--mute);border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.legal-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

/* ===== 11 reveal states ===== */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ===== 12 responsive ===== */
@media (max-width:1080px){
  .header-context{font-size:11px}
  .footer-inner{grid-template-columns:minmax(0,1fr);gap:32px}
}
@media (max-width:900px){
  .masthead{grid-template-columns:minmax(0,1fr) auto;gap:12px}
  .header-context{display:none}
  .header-actions{display:none}
  .nav-toggle{display:inline-flex;justify-self:end}
  .site-nav{display:none;flex-direction:column;align-items:stretch;gap:0;border-top:0;padding-bottom:14px}
  .site-nav[data-open="true"]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item+.nav-item{border-top:1px solid var(--line)}
  .nav-link{
    width:100%;padding:14px 12px;
    border-bottom:0;border-left:2px solid transparent;
    font-size:16px;
  }
  .nav-link:hover{border-left-color:var(--line-strong);background:rgba(16,35,70,.6)}
  .nav-link[aria-current="page"]{border-left-color:var(--orange);background:rgba(255,106,42,.1);border-bottom-color:transparent}
  .nav-status{margin-top:10px;padding:14px 12px 0;border-top:1px solid var(--line)}
  .grid-7-5,.grid-5-7,.grid-3,.grid-2{grid-template-columns:minmax(0,1fr)}
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 20px}
  .footer-col--meter{grid-column:1 / -1}
}
@media (max-width:620px){
  .wrap,.header-inner,.footer-inner{width:min(100% - 2rem,var(--wrap))}
  body{font-size:16px}
  .brand-line{display:none}
  .masthead{min-height:64px}
  .footer-columns{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:8px}
  .prose{max-width:none}
}

/* ===== 13 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;
  }
  .btn:hover,.chip:hover,.footer-link:hover{transform:none}
  [data-reveal]{opacity:1;transform:none}
  .chapter-index,.chapter::before{transition:none}
}