/* ============ 0. RESET ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,dl,dd,blockquote{margin:0}
ul,ol{margin:0;padding:0}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit}
a{color:inherit}
:focus-visible{outline:2px solid var(--red);outline-offset:3px}
.site-header :focus-visible,.site-footer :focus-visible,.section--ink :focus-visible{outline-color:var(--gold);outline-offset:3px}
::selection{background:var(--gold);color:var(--ink-900)}

/* ============ 1. TOKENS ============ */
:root{
  --ink-900:#0B2239;
  --ink-800:#122E4A;
  --ink-soft:rgba(11,34,57,.78);
  --paper:#F4EFE4;
  --paper-0:#FBF8F0;
  --paper-hi:#E8DFCC;
  --gold:#C8A24A;
  --gold-deep:#8A6A22;
  --red:#B4462F;
  --green:#6E8F7E;
  --fog:#C9C2B4;
  --mono-ink:#1A1A1A;
  --rail-w:112px;
  --bw:2px;
  --shadow-hard:6px 6px 0 var(--ink-900);
  --shadow-hard-sm:3px 3px 0 var(--ink-900);
  --dur:180ms;
  --ease:cubic-bezier(.2,.7,.3,1);
  --wrap:1180px;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-serif:"Source Serif 4","Noto Serif SC","Songti SC",Georgia,serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ============ 2. BASE TYPE ============ */
body{
  background:var(--paper);
  color:var(--ink-900);
  font-family:var(--font-sans);
  font-size:clamp(15px,1.02vw,17px);
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-sans);font-weight:900;line-height:1.22;letter-spacing:-.01em}
h1{font-size:clamp(30px,4.4vw,52px)}
h2{font-size:clamp(22px,2.6vw,32px)}
h3{font-size:clamp(18px,1.9vw,23px)}
h4{font-size:17px}
strong{font-weight:800}
.mono{font-family:var(--font-mono)}
#main-content{display:block}

/* ============ 3. LAYOUT PRIMITIVES ============ */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}
.section{padding-block:clamp(34px,5vw,72px)}
.section--tight{padding-block:clamp(22px,3vw,40px)}
.section--ink{background:var(--ink-900);color:var(--paper-0)}
.section--paper0{background:var(--paper-0)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-deep)}
.eyebrow::before{content:"";display:block;width:22px;height:2px;background:var(--red)}
.section--ink .eyebrow{color:var(--gold)}
.section-title{margin:0 0 14px;font-size:clamp(22px,2.6vw,32px);font-weight:900;line-height:1.25}
.section-lede{margin:0;max-width:44ch;color:var(--ink-soft);font-size:clamp(15px,1.1vw,17px)}
.section--ink .section-lede{color:rgba(251,248,240,.78)}
.rule{height:2px;background:var(--ink-900);border:0;margin-block:clamp(18px,3vw,32px)}
.rule--gold{background:var(--gold)}

.grid{display:grid;gap:clamp(16px,2.2vw,28px);grid-template-columns:1fr;align-items:start}
@media (min-width:768px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:900px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--4-8{grid-template-columns:4fr 8fr}
  .grid--8-4{grid-template-columns:8fr 4fr}
  .grid--5-7{grid-template-columns:5fr 7fr}
  .grid--7-5{grid-template-columns:7fr 5fr}
}

/* ============ 4. BUTTONS / TAGS ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;font-family:var(--font-sans);font-size:14.5px;font-weight:800;letter-spacing:.02em;line-height:1.3;text-decoration:none;border:var(--bw) solid var(--ink-900);background:var(--paper-0);color:var(--ink-900);box-shadow:4px 4px 0 var(--ink-900);cursor:pointer;transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease)}
.btn:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 var(--ink-900)}
.btn:active{transform:translate(1px,1px);box-shadow:2px 2px 0 var(--ink-900)}
.btn--primary{background:var(--red);color:#FFF6EC}
.btn--gold{background:var(--gold);color:var(--ink-900)}
.btn--ghost{background:transparent;color:var(--paper-0);border-color:var(--gold);box-shadow:none}
.btn--ghost:hover{background:rgba(200,162,74,.14);box-shadow:none;transform:none}

.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;line-height:1.5;border:1px solid var(--fog);background:transparent;color:var(--ink-800)}
.tag--green{color:#3F5D4D;background:rgba(110,143,126,.18);border-color:var(--green)}
.tag--gold{color:var(--gold-deep);background:rgba(200,162,74,.16);border-color:var(--gold)}
.tag--red{color:#8E3122;background:rgba(180,70,47,.12);border-color:var(--red)}

/* ============ 5. CARD ============ */
.card{background:var(--paper-0);border:var(--bw) solid var(--ink-900);box-shadow:var(--shadow-hard);padding:clamp(16px,2vw,24px);display:flex;flex-direction:column;gap:10px;transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
.card:hover{transform:translateY(-2px);box-shadow:8px 8px 0 var(--ink-900)}
.card__kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--gold-deep)}
.card__title{margin:0;font-size:18px;font-weight:800;line-height:1.35}
.card__text{margin:0;font-size:14.5px;line-height:1.7;color:var(--ink-soft)}
.card__foot{margin-top:auto;padding-top:10px;border-top:1px solid var(--fog);display:flex;flex-wrap:wrap;gap:8px;align-items:center}

/* ============ 6. TABLE ============ */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border:var(--bw) solid var(--ink-900);background:var(--paper-0);box-shadow:var(--shadow-hard-sm)}
.table{width:100%;min-width:560px;border-collapse:collapse;font-size:14.5px}
.table caption{text-align:left;padding:12px 14px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--gold-deep);border-bottom:1px solid var(--fog)}
.table th,.table td{padding:10px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--fog)}
.table thead th{background:var(--ink-800);color:var(--paper-0);font-family:var(--font-mono);font-size:11.5px;font-weight:600;letter-spacing:.1em;position:sticky;top:0;z-index:1}
.table tbody tr:hover{background:var(--paper-hi)}
.table tbody tr:last-child td{border-bottom:0}
.table .is-num{font-family:var(--font-mono);text-align:right;letter-spacing:.02em;color:var(--mono-ink)}

/* ============ 7. FIGURE ============ */
.figure{margin:0;display:flex;flex-direction:column;gap:8px}
.figure__frame{position:relative;border:var(--bw) solid var(--ink-900);box-shadow:var(--shadow-hard);background:var(--ink-800);overflow:hidden;aspect-ratio:3/2}
.figure__frame--wide{aspect-ratio:16/9}
.figure__frame--tall{aspect-ratio:4/5}
.figure__img{width:100%;height:100%;object-fit:cover;filter:saturate(.78) contrast(1.03)}
.figure__cap{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--ink-soft)}
.figure__placeholder{position:absolute;inset:0;display:grid;place-items:center;padding:12px;text-align:center;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;color:rgba(251,248,240,.55);background-color:var(--ink-800);background-image:linear-gradient(to right,rgba(200,162,74,.22) 1px,transparent 1px),linear-gradient(to bottom,rgba(200,162,74,.22) 1px,transparent 1px);background-size:36px 36px}

/* ============ 8. BREADCRUMB ============ */
.breadcrumb{margin:0 0 18px;padding:0}
.breadcrumb__list{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--gold-deep)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--fog)}
.breadcrumb__link{color:inherit;text-decoration:none;border-bottom:1px solid var(--fog);transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.breadcrumb__link:hover{color:var(--red);border-bottom-color:var(--red)}

/* ============ 9. SKIP LINK ============ */
.skip-link{position:absolute;left:8px;top:-72px;z-index:200;display:inline-block;padding:10px 16px;background:var(--paper-0);color:var(--ink-900);border:var(--bw) solid var(--ink-900);font-weight:800;font-size:14px;text-decoration:none;transition:top var(--dur) var(--ease)}
.skip-link:focus{top:8px}

/* ============ 10. HEADER / RAIL ============ */
.site-header{position:sticky;top:0;z-index:70;display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--ink-900);color:var(--paper-0);border-bottom:var(--bw) solid var(--gold)}

.brand{display:flex;align-items:center;gap:10px;flex:0 1 auto;min-width:0;text-decoration:none;color:var(--paper-0)}
.brand__mark{display:grid;place-items:center;flex:0 0 auto;width:38px;height:38px;border:var(--bw) solid var(--gold);background:var(--ink-800);color:var(--gold);font-family:var(--font-mono);font-size:13px;letter-spacing:.06em}
.brand__text{display:flex;flex-direction:column;min-width:0;line-height:1.2}
.brand__name{font-size:17px;font-weight:900;letter-spacing:.04em;white-space:nowrap}
.brand__domain{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;color:var(--gold);white-space:nowrap}
.brand--footer{color:var(--paper-0)}
.brand--footer .brand__mark{border-color:var(--gold);background:var(--ink-800)}
.brand--footer:hover .brand__name{color:var(--gold)}

.nav-toggle{display:inline-flex;align-items:center;gap:8px;margin-left:auto;padding:8px 12px;background:transparent;border:var(--bw) solid var(--fog);color:var(--paper-0);font-size:13px;font-weight:800;letter-spacing:.08em;cursor:pointer;transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease)}
.nav-toggle:hover{border-color:var(--gold);background:rgba(200,162,74,.12)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;background:var(--gold);box-shadow:0 -5px 0 var(--gold),0 5px 0 var(--gold);transition:background var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:var(--red);box-shadow:0 -5px 0 var(--red),0 5px 0 var(--red)}
.nav-toggle__text{line-height:1}

.nav-scrim{position:fixed;inset:0;z-index:65;background:rgba(11,34,57,.62);opacity:0;pointer-events:none;transition:opacity var(--dur) var(--ease)}
.nav-scrim[data-open="true"]{opacity:1;pointer-events:auto}

.nav{position:fixed;top:0;left:0;bottom:0;z-index:70;display:flex;flex-direction:column;gap:14px;width:min(86vw,330px);padding:20px 18px 24px;background:var(--ink-900);color:var(--paper-0);border-right:var(--bw) solid var(--gold);overflow-y:auto;transform:translateX(-103%);transition:transform var(--dur) var(--ease)}
.nav[data-open="true"]{transform:translateX(0)}
.nav__head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;padding-bottom:10px;border-bottom:var(--bw) solid rgba(200,162,74,.45)}
.nav__head-title{font-size:13px;font-weight:900;letter-spacing:.22em;color:var(--gold)}
.nav__head-code{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--fog)}
.nav__list{list-style:none;display:flex;flex-direction:column;margin:0;padding:0}
.nav__item{border-bottom:1px solid rgba(201,194,180,.18)}
.nav__link{display:grid;grid-template-columns:32px 1fr;align-items:center;gap:10px;padding:12px 10px;text-decoration:none;color:rgba(251,248,240,.78);font-size:16px;font-weight:800;border-left:3px solid transparent;transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.nav__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--gold)}
.nav__label{letter-spacing:.06em}
.nav__link:hover{background:rgba(200,162,74,.12);color:var(--paper-0);border-left-color:var(--gold)}
.nav__link[aria-current="page"]{background:var(--paper-0);color:var(--ink-900);border-left-color:var(--red)}
.nav__link[aria-current="page"] .nav__num{color:var(--red)}
.nav__foot{margin-top:auto;display:grid;gap:10px;padding-top:16px;border-top:1px solid rgba(201,194,180,.25)}
.nav__foot-note{margin:0;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;color:var(--fog)}
.nav__cta{width:100%;font-size:13px;padding:10px 8px;white-space:normal;line-height:1.4;text-align:center}

.progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(200,162,74,.22);overflow:hidden;pointer-events:none}
.progress__bar{display:block;height:100%;width:calc(var(--progress,0) * 100%);background:var(--red);transition:width 120ms linear}

body.is-nav-open{overflow:hidden}

/* ============ 11. FOOTER ============ */
.site-footer{position:relative;background:var(--ink-900);color:rgba(251,248,240,.82);border-top:var(--bw) solid var(--gold);padding:clamp(34px,5vw,62px) 0 104px}
.footer__inner{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}
.footer__grid{display:grid;gap:clamp(24px,3vw,32px);grid-template-columns:1fr}
.footer__col{display:flex;flex-direction:column;gap:12px;min-width:0}
.footer__col--brand{gap:14px}
.footer__title{margin:0;font-family:var(--font-mono);font-size:10.5px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:var(--gold)}
.footer__list{list-style:none;display:grid;gap:8px;margin:0;padding:0}
.footer__link{display:inline-block;font-size:14.5px;color:rgba(251,248,240,.8);text-decoration:none;border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.footer__link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.footer__line{margin:0;max-width:34ch;font-size:14px;line-height:1.7;color:rgba(251,248,240,.72)}
.footer__note{margin:0;max-width:36ch;font-size:12.5px;line-height:1.65;color:rgba(251,248,240,.58)}
.footer__facts{margin:0;display:grid;gap:10px}
.footer__fact{margin:0;display:grid;gap:2px}
.footer__fact dt{font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--fog)}
.footer__fact dd{margin:0;font-size:14px;color:var(--paper-0)}
.footer__mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;word-break:break-word}
.footer__bottom{margin-top:clamp(24px,3vw,36px);padding-top:16px;border-top:1px solid rgba(201,194,180,.25);display:flex;flex-wrap:wrap;gap:10px 24px;align-items:center;justify-content:space-between}
.footer__copy{margin:0;font-size:12.5px;color:rgba(251,248,240,.6)}
.footer__icp{margin:0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:var(--fog)}

.feedback-pill{position:fixed;right:clamp(10px,2vw,24px);bottom:clamp(10px,2vw,24px);z-index:90;display:inline-flex;align-items:center;gap:8px;padding:10px 14px;background:var(--red);color:#FFF6EC;font-size:14px;font-weight:800;letter-spacing:.04em;text-decoration:none;border:var(--bw) solid var(--ink-900);box-shadow:4px 4px 0 var(--ink-900);transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
.feedback-pill:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 var(--ink-900)}
.feedback-pill__dot{display:block;flex:0 0 auto;width:8px;height:8px;background:#FFF6EC}
.feedback-pill__text{line-height:1.2}

/* ============ 12. REVEAL ============ */
html.reveal-ready [data-reveal]{opacity:0;transform:translateY(10px);transition:opacity 220ms var(--ease),transform 220ms var(--ease)}
html.reveal-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ============ 13. RESPONSIVE SHELL ============ */
@media (min-width:640px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__col--brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .site-header{position:fixed;inset:0 auto 0 0;width:var(--rail-w);height:100vh;flex-direction:column;align-items:stretch;gap:16px;padding:20px 12px 18px;border-bottom:0;border-right:var(--bw) solid var(--gold);overflow:visible}
  .site-header .brand{flex-direction:column;align-items:flex-start;gap:8px}
  .site-header .brand__mark{width:100%;height:42px;font-size:12px}
  .site-header .brand__name{font-size:15px;letter-spacing:.02em}
  .site-header .brand__domain{font-size:8.5px;line-height:1.35;white-space:normal;overflow-wrap:anywhere}
  .nav-toggle{display:none}
  .nav-scrim{display:none}
  .nav{position:static;transform:none;width:auto;flex:1 1 auto;padding:0;background:transparent;border:0;overflow-y:auto;overflow-x:hidden;gap:0}
  .nav__head{padding-bottom:8px;margin-bottom:8px}
  .nav__head-title{font-size:11px;letter-spacing:.14em}
  .nav__head-code{display:none}
  .nav__item{border-bottom:1px solid rgba(201,194,180,.14)}
  .nav__link{grid-template-columns:1fr;gap:2px;padding:9px 8px;font-size:13px;line-height:1.3}
  .nav__num{font-size:9.5px;letter-spacing:.1em}
  .nav__foot{padding-top:12px;gap:8px}
  .nav__foot-note{font-size:9px;line-height:1.4}
  .nav__cta{font-size:11.5px;padding:8px 6px;letter-spacing:0}
  .progress{left:auto;top:0;right:-2px;bottom:0;width:2px;height:auto}
  .progress__bar{width:100%;height:calc(var(--progress,0) * 100%);transition:height 120ms linear}
  body.is-nav-open{overflow:auto}
  .footer__grid{grid-template-columns:1.5fr .9fr .9fr 1.1fr;gap:clamp(20px,2.4vw,32px)}
  .footer__col--brand{grid-column:auto}
}
@media (min-width:1280px){
  :root{--rail-w:120px}
}

/* ============ 14. MOTION PREFERENCES ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .card:hover,.btn:hover,.feedback-pill:hover{transform:none}
  .progress__bar{transition:none}
  html.reveal-ready [data-reveal]{opacity:1;transform:none;transition:none}
}