*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,figure,dl,dt,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

:root{
  --turf:#0C2E1E;
  --night:#05130C;
  --cyan:#14D8C6;
  --cyan-deep:#0A5A63;
  --orange:#FF6A13;
  --amber:#FFAE5C;
  --cream:#F3F7F2;
  --slate:#C6D4CA;
  --indigo:#2B2350;
  --wine:#6E1F3A;
  --ink:#12211A;
  --ink-soft:#405148;
  --on-dark:#F3F7F2;
  --on-dark-soft:#B9CBBF;
  --line:rgba(10,90,99,.26);
  --line-strong:rgba(10,90,99,.5);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-narrow:"Barlow Condensed","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --r-pill:999px;
  --cut:18px;
  --wrap:1200px;
  --gutter:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.2,.7,.2,1);
  --shadow-soft:0 20px 46px -30px rgba(5,19,12,.7);
}

body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.65;
  color:var(--ink);
  background-color:var(--cream);
  background-image:linear-gradient(rgba(10,90,99,.045) 1px,transparent 1px);
  background-size:100% 56px;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-weight:900;line-height:1.22;letter-spacing:-.01em;text-wrap:balance}
h1{font-family:var(--font-narrow);font-size:clamp(34px,5.4vw,72px)}
h2{font-size:clamp(24px,3.4vw,32px)}
h3{font-size:clamp(19px,2.4vw,24px)}
p{text-wrap:pretty}
::selection{background:rgba(20,216,198,.35)}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:3px}

.skip-link{position:absolute;left:var(--gutter);top:-72px;z-index:140;padding:10px 20px;background:var(--orange);color:#1A0C03;font-weight:700;border-radius:0 0 10px 10px;transition:top .2s var(--ease)}
.skip-link:focus{top:0}

.container{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.section{padding-block:clamp(44px,7vw,88px)}
.section--dark{background:var(--turf);color:var(--on-dark)}
.section--deep{background:var(--night);color:var(--on-dark)}
.section--indigo{background:var(--indigo);color:var(--on-dark)}
.section-head{display:grid;gap:12px;max-width:820px;margin-bottom:clamp(24px,4vw,44px)}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan-deep)}
.section--dark .eyebrow,.section--deep .eyebrow,.section--indigo .eyebrow{color:var(--cyan)}
.section-title{font-family:var(--font-narrow);font-size:clamp(26px,4vw,44px)}
.lede{font-size:clamp(16px,1.6vw,18px);color:var(--ink-soft);max-width:68ch}
.section--dark .lede,.section--deep .lede,.section--indigo .lede{color:var(--on-dark-soft)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.4vw,28px)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

.section-slant{position:relative}
.section-slant::before{content:"";position:absolute;left:0;right:0;top:0;height:clamp(24px,4vw,56px);background:repeating-linear-gradient(-12deg,rgba(20,216,198,.14) 0 1px,transparent 1px 18px);pointer-events:none}
.divider-slant{height:2px;border:0;margin:clamp(24px,4vw,48px) 0;background:linear-gradient(90deg,var(--cyan) 0%,rgba(20,216,198,0) 68%);transform:rotate(-.6deg)}

.chapter{position:relative;display:grid;gap:clamp(16px,3vw,28px);padding-block:clamp(30px,4.6vw,56px)}
.chapter-no{display:inline-flex;align-items:center;justify-content:center;min-width:46px;height:28px;padding:0 10px;font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--cream);background:var(--wine);clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,10px 100%,0 calc(100% - 10px))}
.chapter-title{font-family:var(--font-narrow);font-size:clamp(22px,3vw,32px)}
.chapter-body{max-width:68ch;color:var(--ink-soft)}
.section--dark .chapter-body,.section--deep .chapter-body,.section--indigo .chapter-body{color:var(--on-dark-soft)}

.cut-panel{position:relative;padding:clamp(18px,2.6vw,30px);background:#fff;border:1px solid var(--line);clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)))}
.cut-panel--dark{background:var(--turf);border-color:rgba(20,216,198,.3);color:var(--on-dark)}
.cut-panel--flat{background:transparent;border-style:dashed}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.cut-panel--dark .panel-head{border-bottom-color:rgba(20,216,198,.25)}
.panel-meta{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--cyan-deep)}
.cut-panel--dark .panel-meta{color:var(--cyan)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;font-size:14.5px;font-weight:700;border:1px solid transparent;border-radius:var(--r-pill);cursor:pointer;transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease)}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--orange);color:#1A0C03}
.btn-primary:hover{background:var(--amber)}
.btn-ghost{background:transparent;border-color:rgba(20,216,198,.42);color:var(--cyan)}
.btn-ghost:hover{background:rgba(20,216,198,.14);border-color:var(--cyan)}
.btn--sm{padding:7px 14px;font-size:13px}
.btn--block{display:flex;width:100%}
.btn-cut{border-radius:0;clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px))}

.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;border:1px solid var(--line-strong);color:var(--cyan-deep);background:rgba(10,90,99,.06)}
.tag--orange{border-color:var(--orange);color:#8A3403;background:rgba(255,106,19,.1)}
.tag--cyan{border-color:var(--cyan);color:#065049;background:rgba(20,216,198,.12)}
.tag--wine{border-color:var(--wine);color:var(--wine);background:rgba(110,31,58,.08)}
.tag--on-dark{color:var(--on-dark);border-color:rgba(20,216,198,.5);background:rgba(20,216,198,.1)}

.data-figure{margin:0}
.data-num{display:inline-block;font-family:var(--font-mono);font-weight:700;font-size:clamp(34px,5vw,56px);line-height:1;letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--ink)}
.section--dark .data-num,.section--deep .data-num,.section--indigo .data-num{color:var(--on-dark)}
.data-unit{font-family:var(--font-mono);font-size:.42em;margin-left:2px;color:var(--cyan-deep)}
.section--dark .data-unit,.section--deep .data-unit,.section--indigo .data-unit{color:var(--cyan)}
.data-label{display:block;margin-top:8px;font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--ink-soft)}
.section--dark .data-label,.section--deep .data-label,.section--indigo .data-label{color:var(--on-dark-soft)}
.data-row{display:flex;flex-wrap:wrap;gap:clamp(18px,3vw,40px)}

.data-table{width:100%;font-size:15px}
.data-table th,.data-table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line)}
.data-table th{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--cyan-deep);font-weight:400}
.data-table tbody tr:nth-child(even){background:rgba(198,212,202,.22)}

.timeline{display:grid;gap:18px}
.timeline-item{display:grid;grid-template-columns:72px 1fr;gap:16px;align-items:start;padding-bottom:16px;border-bottom:1px solid var(--line)}
.timeline-mark{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--orange)}

.media-frame{position:relative;overflow:hidden;aspect-ratio:16/9;background:linear-gradient(150deg,var(--turf),var(--night));border:1px solid rgba(20,216,198,.28);clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,22px 100%,0 calc(100% - 22px))}
.media-frame::before{content:"";position:absolute;inset:0;background-image:repeating-linear-gradient(-12deg,rgba(20,216,198,.15) 0 1px,transparent 1px 22px);pointer-events:none}
.media-frame>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.media-frame__label{position:absolute;left:14px;bottom:12px;z-index:2;padding:4px 9px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--on-dark);background:rgba(5,19,12,.74)}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--hero{aspect-ratio:4/5}

.tabs{display:grid;gap:clamp(16px,2.4vw,26px)}
.tablist{position:relative;display:flex;flex-wrap:wrap;gap:4px;padding:5px;border:1px solid var(--line-strong);background:#fff}
.tab{position:relative;z-index:1;padding:9px 16px;font-family:var(--font-mono);font-size:14px;letter-spacing:.04em;color:var(--ink-soft);transition:color .18s var(--ease)}
.tab:hover{color:var(--ink)}
.tab[aria-selected="true"]{color:var(--on-dark);font-weight:700}
.tab-indicator{position:absolute;top:5px;left:0;z-index:0;height:calc(100% - 10px);width:0;background:var(--turf);transition:transform .24s var(--ease),width .24s var(--ease)}
.tabpanel{animation:panelIn .28s var(--ease)}
.tabpanel[hidden]{display:none}
@keyframes panelIn{from{opacity:0}to{opacity:1}}

.breadcrumb{padding-block:14px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:13px;color:var(--ink-soft)}
.breadcrumb-item+ .breadcrumb-item::before{content:"/";margin-right:8px;color:var(--slate)}
.breadcrumb-item a{color:var(--cyan-deep)}
.breadcrumb-item a:hover{color:var(--orange)}

.prose{max-width:68ch;font-size:17px;line-height:1.65}
.prose>*+*{margin-top:1em}
.prose h2{margin-top:1.8em;font-size:clamp(22px,2.6vw,28px)}
.prose h3{margin-top:1.4em;font-size:clamp(18px,2vw,21px)}
.prose ul{list-style:disc;padding-left:1.2em}
.prose ol{list-style:decimal;padding-left:1.4em}
.prose li+li{margin-top:.4em}
.prose a{color:var(--cyan-deep);border-bottom:1px solid rgba(10,90,99,.35)}
.prose a:hover{border-bottom-color:var(--orange)}
.prose code{font-family:var(--font-mono);font-size:.92em;background:rgba(10,90,99,.08);padding:.1em .35em}
.prose blockquote{margin:1.4em 0;padding:14px 18px;border-left:3px solid var(--cyan);background:rgba(20,216,198,.08);color:var(--ink-soft)}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:80;color:var(--on-dark);background:linear-gradient(180deg,rgba(5,19,12,.98),rgba(12,46,30,.95));border-bottom:1px solid rgba(20,216,198,.24);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.header-strip{max-height:44px;overflow:hidden;background:rgba(5,19,12,.7);border-bottom:1px solid rgba(20,216,198,.16);transition:max-height .3s var(--ease),opacity .3s var(--ease),border-color .3s var(--ease)}
.site-header[data-scrolled] .header-strip{max-height:0;opacity:0;border-bottom-color:transparent}
.strip-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:34px}
.strip-item{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--on-dark-soft)}
.strip-item--meta{color:var(--cyan);white-space:nowrap}
.status-dot{flex:0 0 auto;width:8px;height:8px;border-radius:50%;background:var(--orange);box-shadow:0 0 0 3px rgba(255,106,19,.22)}

.header-shell{display:flex;align-items:center;flex-wrap:wrap;gap:14px;padding-top:12px;padding-bottom:12px;transition:padding .3s var(--ease)}
.site-header[data-scrolled] .header-shell{padding-top:8px;padding-bottom:8px}

.brand{order:1;display:inline-flex;align-items:center;gap:10px;padding:6px 14px 6px 6px;border:1px solid rgba(20,216,198,.3);border-radius:var(--r-pill);background:rgba(12,46,30,.65);transition:border-color .2s var(--ease),background .2s var(--ease)}
.brand:hover{border-color:var(--cyan);background:rgba(12,46,30,.9)}
.brand-mark{display:grid;place-items:center;flex:0 0 34px;width:34px;height:34px;font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--night);background:linear-gradient(140deg,var(--cyan),#0AA79A);clip-path:polygon(0 0,70% 0,100% 30%,100% 100%,30% 100%,0 70%)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-line{font-size:15.5px;font-weight:700;letter-spacing:.02em;color:var(--on-dark)}
.brand-sub{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;color:var(--cyan)}
.brand--footer{padding:0;border:0;background:none}
.brand--footer:hover{border-color:transparent;background:none}

.capsule-nav{order:3;margin:0 auto;padding:5px;border:1px solid rgba(20,216,198,.26);border-radius:var(--r-pill);background:rgba(5,19,12,.6)}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{display:block;padding:8px 15px;font-size:14.5px;color:var(--on-dark-soft);white-space:nowrap;border-radius:var(--r-pill);transition:color .18s var(--ease),background .18s var(--ease)}
.nav-link:hover{color:var(--on-dark);background:rgba(20,216,198,.14)}
.nav-link[aria-current="page"]{color:var(--night);background:var(--cyan);font-weight:700}

.header-actions{order:4;display:flex;align-items:center;gap:10px}

.nav-toggle{order:2;display:none;align-items:center;gap:8px;margin-left:auto;padding:9px 14px;border:1px solid rgba(20,216,198,.35);border-radius:var(--r-pill);background:rgba(5,19,12,.6);color:var(--on-dark);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;transition:border-color .2s var(--ease)}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars i{display:block;height:2px;background:var(--cyan);transition:transform .24s var(--ease),opacity .24s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.scroll-progress{position:absolute;left:0;bottom:-1px;width:100%;height:3px;transform:scaleX(0);transform-origin:left center;background:linear-gradient(90deg,var(--cyan),var(--orange))}

/* ---------- Footer ---------- */
.site-footer{position:relative;overflow:hidden;background:var(--night);color:var(--on-dark-soft);border-top:1px solid rgba(20,216,198,.22)}
.site-footer::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:repeating-linear-gradient(-12deg,rgba(20,216,198,.07) 0 1px,transparent 1px 16px)}
.footer-shell{position:relative;padding-top:clamp(40px,6vw,72px);padding-bottom:26px}
.footer-top{display:grid;grid-template-columns:minmax(280px,1.1fr) 2fr;gap:clamp(28px,4vw,64px);padding-bottom:clamp(28px,4vw,48px);border-bottom:1px solid rgba(20,216,198,.18)}
.footer-brand{display:grid;gap:16px;align-content:start}
.footer-tagline{font-size:15px;color:var(--on-dark-soft);max-width:44ch}
.footer-facts{display:grid;gap:12px}
.fact-item{display:grid;gap:2px}
.fact-key{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan)}
.fact-val{font-size:14px;color:var(--on-dark-soft)}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px)}
.footer-col-title{margin-bottom:14px;font-family:var(--font-mono);font-size:12px;font-weight:400;letter-spacing:.14em;color:var(--cyan)}
.footer-links{display:grid;gap:10px}
.footer-links a{display:inline-block;padding-bottom:1px;font-size:15px;color:var(--on-dark-soft);border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.footer-links a:hover{color:var(--on-dark);border-bottom-color:var(--orange)}

.footer-contact{margin-top:clamp(24px,3.5vw,44px);padding:clamp(18px,2.4vw,28px);background:rgba(12,46,30,.62);border:1px solid rgba(20,216,198,.24);clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,22px 100%,0 calc(100% - 22px))}
.contact-title{margin-bottom:14px;font-family:var(--font-mono);font-size:12.5px;font-weight:400;letter-spacing:.14em;color:var(--cyan)}
.contact-list{display:grid;gap:12px}
.contact-item{display:flex;align-items:center;flex-wrap:wrap;gap:10px;font-size:15px}
.contact-key{min-width:76px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--on-dark-soft)}
.contact-val{font-family:var(--font-mono);font-size:14px;letter-spacing:.02em;color:var(--on-dark)}
.copy-btn{padding:4px 10px;border:1px solid rgba(20,216,198,.4);border-radius:var(--r-pill);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--cyan);transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease)}
.copy-btn:hover{background:rgba(20,216,198,.16)}
.copy-btn[data-copied]{background:var(--orange);border-color:var(--orange);color:#1A0C03}
.contact-note{margin-top:16px;padding-top:14px;border-top:1px dashed rgba(20,216,198,.25);font-size:13.5px;color:var(--on-dark-soft)}

.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:20px}
.footer-copy{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;color:var(--on-dark-soft)}
.footer-legal{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;color:var(--cyan)}
.footer-note{margin-top:14px;font-size:13px;color:rgba(198,212,202,.72)}

/* ---------- Motion ---------- */
@media (prefers-reduced-motion:no-preference){
  html[data-motion="on"] [data-reveal]{opacity:0;transform:translateY(16px);clip-path:inset(0 0 14% 0);transition:opacity .42s var(--ease),transform .42s var(--ease),clip-path .42s var(--ease);transition-delay:var(--reveal-delay,0ms)}
  html[data-motion="on"] [data-reveal].is-visible{opacity:1;transform:none;clip-path:inset(0 0 0 0)}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  .tabpanel{animation:none}
}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .col-3,.col-4,.col-5,.col-7,.col-8{grid-column:span 6}
  .header-shell{row-gap:10px}
  .brand,.nav-toggle{order:1}
  .nav-toggle{order:2;display:inline-flex}
  .capsule-nav{display:none;order:3;flex:1 1 100%;width:100%;margin:0;padding:8px;border-radius:18px;background:rgba(5,19,12,.86)}
  .capsule-nav[data-open]{display:block;animation:navDrop .24s var(--ease)}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-link{padding:12px 14px;font-size:16px;border-radius:12px}
  .header-actions{display:none;order:4;flex:1 1 100%;flex-wrap:wrap}
  .site-header[data-open] .header-actions{display:flex}
  .header-actions .btn{flex:1 1 150px}
  .footer-top{grid-template-columns:1fr}
}
@keyframes navDrop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
@media (max-width:720px){
  body{font-size:16px}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12}
  .brand-sub{display:none}
  .strip-item--meta{display:none}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .timeline-item{grid-template-columns:56px 1fr;gap:12px}
}