/* ===== 00 reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,figure,blockquote,dl,dd,h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding:0}
ul[class],ol[class]{list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* ===== 01 tokens ===== */
:root{
  --sky:#0B6E8A;
  --sky-mist:#D9EFF4;
  --sky-deep:#064A5E;
  --red:#C7362F;
  --red-deep:#8E211C;
  --fy:#E7B84B;
  --fg:#4F8A6B;
  --fb:#2F5D9A;
  --paper:#F7F5EF;
  --paper-2:#F1EEE5;
  --ink:#1C2321;
  --grey:#5E6A66;
  --line:#C9D6D2;
  --line-soft:rgba(28,35,33,.1);
  --onDark:rgba(247,245,239,.9);
  --r:3px;
  --head-h:4.25rem;
  --gutter:clamp(1.15rem,5.5vw,6.5rem);
  --maxw:1400px;
  --measure:34em;
  --shadow-1:0 1px 0 rgba(28,35,33,.04),0 14px 30px -26px rgba(6,74,94,.6);
  --ff-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --ff-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --t:220ms;
}

/* ===== 02 base type ===== */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--ff-sans);
  font-size:1.0625rem;
  line-height:1.8;
  font-weight:400;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
@media (max-width:640px){body{font-size:1rem;line-height:1.78}}
::selection{background:var(--fy);color:var(--ink)}
:focus-visible{outline:3px solid var(--red);outline-offset:3px;border-radius:2px}
.site-head[data-scrolled="true"] :focus-visible,
.site-foot :focus-visible{outline-color:var(--fy)}

/* ===== 03 utilities ===== */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.mono{font-family:var(--ff-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.measure{max-width:var(--measure)}
.display{
  font-size:clamp(2.8rem,7vw,6.4rem);
  font-weight:900;
  line-height:.95;
  letter-spacing:-.02em;
}
.title-page{
  font-size:clamp(1.8rem,3.6vw,3.2rem);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.02em;
}
.title-sec{
  font-size:clamp(1.3rem,2.2vw,1.9rem);
  font-weight:700;
  line-height:1.3;
  letter-spacing:-.01em;
}
.kicker{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:var(--ff-mono);
  font-size:.7rem;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;
  color:var(--red-deep);
}
.kicker::before{content:"";width:14px;height:2px;background:currentColor}
.lede{
  font-size:clamp(1.02rem,1.6vw,1.22rem);
  line-height:1.78;color:var(--grey);max-width:36em;
}
.rule{height:1px;background:var(--line);border:0;margin:clamp(1.5rem,4vw,2.5rem) 0}
.note{
  font-size:.94rem;line-height:1.75;color:var(--grey);
  border-left:2px solid var(--fy);padding-left:.9rem;max-width:30em;
}
.stat{
  font-family:var(--ff-mono);font-weight:600;
  font-size:clamp(1.6rem,3vw,2.4rem);
  color:var(--sky-deep);letter-spacing:.01em;
}
.prose{max-width:var(--measure);font-size:1.0625rem;line-height:1.85}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:clamp(1.3rem,2.2vw,1.75rem);font-weight:800;line-height:1.35;letter-spacing:-.01em}
.prose h3{font-size:1.15rem;font-weight:700}
.prose a{color:var(--red-deep);text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:.2em}
.prose a:hover{text-decoration-color:var(--red)}
.prose ul{list-style:none;padding-left:0}
.prose ul li{position:relative;padding-left:1.2em}
.prose ul li::before{content:"";position:absolute;left:0;top:.75em;width:8px;height:2px;background:var(--sky)}
.prose strong{font-weight:700}

/* sections & grid */
.section{padding-block:clamp(2.75rem,7vw,6rem)}
.section--mist{background:var(--sky-mist)}
.section--paper2{background:var(--paper-2)}
.section--deep{background:var(--sky-deep);color:var(--onDark)}
.section--deep .title-sec,.section--deep .title-page,.section--deep .display{color:#fff}
.section--deep .lede,.section--deep .note{color:rgba(247,245,239,.75)}
.grid{
  display:grid;gap:clamp(1rem,2.4vw,1.75rem);
  grid-template-columns:repeat(auto-fit,minmax(min(100%,17rem),1fr));
}
.stack{display:grid;gap:clamp(.75rem,2vw,1.25rem)}
.split{display:grid;gap:clamp(1.25rem,3vw,2.5rem);grid-template-columns:1fr}
@media (min-width:900px){
  .split{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .split--aside{grid-template-columns:minmax(0,.85fr) minmax(0,1.6fr)}
  .split--aside > :first-child{position:sticky;top:calc(var(--head-h) + 1.5rem);align-self:start}
}

/* ===== 04 buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.7rem 1.1rem;border-radius:var(--r);
  border:1px solid transparent;
  font-size:.92rem;font-weight:600;line-height:1.2;
  letter-spacing:.01em;cursor:pointer;
  transition:background-color var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.btn--red{background:var(--red);color:#fff;border-color:var(--red);box-shadow:0 1px 0 rgba(0,0,0,.06)}
.btn--red:hover{background:var(--red-deep);border-color:var(--red-deep)}
.btn--sky{background:var(--sky);color:#fff;border-color:var(--sky)}
.btn--sky:hover{background:var(--sky-deep);border-color:var(--sky-deep)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--sky);color:var(--sky-deep);background:var(--sky-mist)}
.btn--quiet{
  background:none;border:0;padding:.35rem 0;color:var(--red-deep);
  border-bottom:1px solid var(--line);border-radius:0;
}
.btn--quiet::after{content:"→";font-family:var(--ff-mono);transition:transform var(--t) var(--ease)}
.btn--quiet:hover::after{transform:translateX(4px)}

/* ===== 05 skip link ===== */
.skip{
  position:fixed;top:.5rem;left:.5rem;z-index:300;
  transform:translateY(-180%);
  background:var(--sky-deep);color:#fff;
  padding:.7rem 1rem;border-radius:var(--r);
  font-size:.9rem;font-weight:600;
  transition:transform 160ms var(--ease);
}
.skip:focus{transform:none}

/* ===== 06 header ===== */
.brand{display:inline-flex;align-items:center;gap:.65rem;min-width:0}
.brand__mark{
  flex:none;width:32px;height:30px;
  background-image:
    linear-gradient(var(--fy),var(--fy)),
    linear-gradient(var(--red),var(--red)),
    linear-gradient(var(--sky),var(--sky));
  background-repeat:no-repeat;
  background-size:34% 6px,66% 6px,100% 6px;
  background-position:left top,left 12px,left 24px;
  transition:transform var(--t) var(--ease);
}
.brand:hover .brand__mark{transform:translateY(-2px)}
.brand__text{display:grid;gap:.1rem;min-width:0}
.brand__line{
  font-size:1.02rem;font-weight:800;letter-spacing:-.01em;line-height:1.2;
  white-space:nowrap;
}
.brand__sub{
  font-family:var(--ff-mono);font-size:.6rem;letter-spacing:.14em;
  color:var(--grey);white-space:nowrap;
}

.site-head{
  position:sticky;top:0;z-index:100;
  color:var(--ink);
  background:rgba(247,245,239,.9);
  -webkit-backdrop-filter:blur(8px) saturate(1.15);
  backdrop-filter:blur(8px) saturate(1.15);
  border-bottom:1px solid var(--line-soft);
  transition:background-color var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.site-head__inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:1rem;min-height:var(--head-h);
}
.site-head[data-scrolled="true"]{
  background:var(--sky-deep);
  color:#fff;
  border-bottom-color:rgba(255,255,255,.16);
  box-shadow:0 10px 26px -20px rgba(6,74,94,.95);
}
.site-head[data-scrolled="true"] .brand__sub{color:rgba(247,245,239,.68)}
.site-head[data-scrolled="true"] .brand__mark{
  background-image:
    linear-gradient(#fff,#fff),
    linear-gradient(var(--fy),var(--fy)),
    linear-gradient(#fff,#fff);
}

/* scroll progress */
.head-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(11,110,138,.16);overflow:hidden;
}
.head-progress__bar{
  display:block;height:100%;width:100%;
  background:var(--red);
  transform:scaleX(var(--p,0));transform-origin:0 50%;
  transition:transform 90ms linear,background-color var(--t) var(--ease);
}
.site-head[data-scrolled="true"] .head-progress{background:rgba(255,255,255,.2)}
.site-head[data-scrolled="true"] .head-progress__bar{background:var(--fy)}

/* mobile toggle */
.nav-toggle{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.45rem .6rem;border:1px solid var(--line);border-radius:var(--r);
  font-family:var(--ff-mono);font-size:.72rem;letter-spacing:.12em;
  color:inherit;
  transition:border-color var(--t) var(--ease),background-color var(--t) var(--ease);
}
.nav-toggle:hover{border-color:var(--sky);background:var(--sky-mist);color:var(--sky-deep)}
.site-head[data-scrolled="true"] .nav-toggle{border-color:rgba(255,255,255,.34)}
.site-head[data-scrolled="true"] .nav-toggle:hover{background:rgba(255,255,255,.12);color:#fff}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:2px;background:currentColor;transition:transform var(--t) var(--ease),opacity var(--t) var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) 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(-5px) rotate(-45deg)}

/* nav — mobile panel */
.nav{
  position:fixed;left:0;right:0;top:var(--head-h);
  display:flex;flex-direction:column;gap:.9rem;
  padding:1rem var(--gutter) 1.6rem;
  background:var(--sky-deep);color:#fff;
  border-top:1px solid rgba(255,255,255,.16);
  max-height:calc(100dvh - var(--head-h));overflow:auto;
  visibility:hidden;opacity:0;transform:translateY(-.5rem);
  transition:opacity var(--t) var(--ease),transform var(--t) var(--ease),visibility 0s linear var(--t);
}
.nav[data-open]{
  visibility:visible;opacity:1;transform:none;
  transition:opacity var(--t) var(--ease),transform var(--t) var(--ease),visibility 0s;
}
.nav__list{display:grid;gap:0}
.nav__item{--step:0;border-bottom:1px solid rgba(247,245,239,.14)}
.nav__item:nth-child(2){--step:.55rem}
.nav__item:nth-child(3){--step:1.1rem}
.nav__item:nth-child(4){--step:1.65rem}
.nav__item:nth-child(5){--step:2.2rem}
.nav__item:nth-child(6){--step:2.75rem}
.nav__link{
  display:flex;align-items:baseline;gap:.6rem;
  padding:.85rem 0 .85rem var(--step,0);
  font-size:1rem;font-weight:600;color:#fff;
  transition:color var(--t) var(--ease),background-color var(--t) var(--ease);
}
.nav__link:hover{background:rgba(255,255,255,.06)}
.nav__num{
  font-family:var(--ff-mono);font-size:.64rem;font-weight:600;
  letter-spacing:.12em;color:var(--fy);
}
.nav__link[aria-current="page"]{color:var(--fy)}
.nav__util{
  align-self:flex-start;
  font-family:var(--ff-mono);font-size:.74rem;letter-spacing:.1em;
  color:rgba(247,245,239,.8);
  border-bottom:1px solid rgba(247,245,239,.3);
  padding-bottom:.15rem;
}
.nav__util:hover{color:#fff;border-bottom-color:var(--fy)}
.nav__cta{align-self:flex-start;margin-top:.3rem}

/* nav — desktop */
@media (min-width:900px){
  :root{--head-h:5rem}
  .nav-toggle{display:none}
  .nav{
    position:static;visibility:visible;opacity:1;transform:none;
    flex-direction:row;align-items:center;gap:1.15rem;
    padding:0;background:none;color:inherit;border:0;
    max-height:none;overflow:visible;
  }
  .nav__list{display:flex;align-items:center;gap:1.05rem}
  .nav__item{border:0}
  .nav__link{
    position:relative;padding:.45rem 0;
    font-size:.93rem;color:inherit;gap:.3rem;
  }
  .nav__link::after{
    content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;
    background:var(--red);transform:scaleX(0);transform-origin:0 50%;
    transition:transform 200ms var(--ease);
  }
  .nav__link:hover::after{transform:scaleX(1)}
  .nav__link[aria-current="page"]{color:var(--red-deep)}
  .nav__link[aria-current="page"]::after{transform:scaleX(1)}
  .site-head[data-scrolled="true"] .nav__link[aria-current="page"]{color:#fff}
  .site-head[data-scrolled="true"] .nav__link::after{background:var(--fy)}
  .nav__num{font-size:.58rem;order:2;opacity:.75}
  .site-head[data-scrolled="true"] .nav__num{color:var(--fy)}
  .nav__util{display:none}
}
@media (min-width:1240px){
  .nav__util{display:inline-block;font-size:.72rem;color:var(--grey);border-bottom-color:var(--line)}
  .site-head[data-scrolled="true"] .nav__util{color:rgba(247,245,239,.8);border-bottom-color:rgba(255,255,255,.34)}
  .site-head[data-scrolled="true"] .nav__util:hover{color:#fff}
  .nav__list{gap:1.35rem}
}

/* ===== 07 breadcrumbs ===== */
.crumbs{
  font-family:var(--ff-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--grey);
}
.crumbs ol{display:flex;flex-wrap:wrap;gap:.45rem}
.crumbs li{display:inline-flex;align-items:center;gap:.45rem}
.crumbs li + li::before{content:"/";color:var(--line)}
.crumbs a:hover{color:var(--red-deep)}
.crumbs [aria-current="page"]{color:var(--ink)}

/* ===== 08 cards, tags, stats ===== */
.card{
  position:relative;
  background:#fff;border:1px solid var(--line);border-radius:var(--r);
  padding:clamp(1rem,2vw,1.5rem);
  box-shadow:var(--shadow-1);
  transition:border-color var(--t) var(--ease),transform var(--t) var(--ease);
}
.card:hover{border-color:var(--sky)}
.card__index{
  display:block;margin-bottom:.5rem;
  font-family:var(--ff-mono);font-size:.7rem;font-weight:600;
  letter-spacing:.12em;color:var(--sky);
}
.tag{
  display:inline-flex;align-items:center;gap:.3rem;
  padding:.18rem .5rem;border-radius:2px;
  border:1px solid var(--line);background:var(--paper);
  font-family:var(--ff-mono);font-size:.66rem;font-weight:600;
  letter-spacing:.12em;text-transform:uppercase;color:var(--grey);
}
.tag--yellow{border-color:rgba(231,184,75,.7);background:rgba(231,184,75,.14);color:#7a5a10}
.tag--green{border-color:rgba(79,138,107,.6);background:rgba(79,138,107,.12);color:#2f5e46}
.tag--blue{border-color:rgba(47,93,154,.5);background:rgba(47,93,154,.1);color:#203f6b}
.tag--red{border-color:rgba(199,54,47,.45);background:rgba(199,54,47,.1);color:var(--red-deep)}

/* ===== 09 figures (page stage fills) ===== */
.figure{
  position:relative;margin:0;overflow:hidden;
  border-radius:var(--r);border:1px solid var(--line);
  background:var(--sky-mist);
}
.figure__img{
  display:block;width:100%;height:100%;object-fit:cover;
  aspect-ratio:16/10;
}
.figure__ph{
  aspect-ratio:16/10;
  background-image:
    linear-gradient(135deg,rgba(11,110,138,.18),rgba(217,239,244,.7) 45%,rgba(199,54,47,.14)),
    repeating-linear-gradient(115deg,rgba(6,74,94,.1) 0 1px,transparent 1px 26px);
}
.figure--tall .figure__img,
.figure--tall .figure__ph{aspect-ratio:3/4}
.figure--wide .figure__img,
.figure--wide .figure__ph{aspect-ratio:21/9}
.figure--square .figure__img,
.figure--square .figure__ph{aspect-ratio:1/1}
.figure__caption{
  margin-top:.6rem;
  font-size:.82rem;line-height:1.7;color:var(--grey);
}

/* ===== 10 filter bar ===== */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  padding:.85rem 0;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.filter-btn{
  display:inline-flex;align-items:center;
  padding:.4rem .8rem;border-radius:2px;
  border:1px solid var(--line);background:transparent;
  font-family:var(--ff-mono);font-size:.72rem;font-weight:600;
  letter-spacing:.1em;color:var(--grey);
  transition:background-color var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease);
}
.filter-btn:hover{border-color:var(--sky);color:var(--sky-deep)}
.filter-btn[aria-pressed="true"]{background:var(--sky);border-color:var(--sky);color:#fff}
.filter-count{
  margin-left:auto;
  font-family:var(--ff-mono);font-size:.72rem;letter-spacing:.1em;color:var(--grey);
}
[data-filter-item][hidden]{display:none}

/* ===== 11 reveal ===== */
[data-reveal]{transition:opacity 240ms var(--ease),transform 260ms var(--ease)}
.js-reveal [data-reveal]:not(.is-in){opacity:0;transform:translateY(16px)}

/* ===== 12 footer ===== */
.flag-strip{
  display:block;height:6px;
  background-image:linear-gradient(90deg,
    var(--fy) 0 20%,
    var(--fg) 20% 40%,
    var(--fb) 40% 60%,
    var(--red) 60% 80%,
    var(--sky) 80% 100%);
}
.site-foot{
  background:var(--sky-deep);
  color:var(--onDark);
  margin-top:clamp(3rem,8vw,7rem);
}
.site-foot__top{
  display:grid;gap:clamp(1.75rem,4vw,2.75rem);
  grid-template-columns:1fr;
  padding-block:clamp(2.5rem,5vw,4.5rem) clamp(2rem,4vw,3rem);
}
@media (min-width:700px){
  .site-foot__top{grid-template-columns:1fr 1fr}
}
@media (min-width:1024px){
  .site-foot__top{grid-template-columns:1.2fr .8fr .85fr 1.15fr;gap:clamp(1.5rem,3vw,3rem)}
}
.brand--foot{color:#fff}
.brand--foot .brand__sub{color:rgba(247,245,239,.62)}
.brand--foot .brand__mark{
  background-image:
    linear-gradient(var(--fy),var(--fy)),
    linear-gradient(var(--red),var(--red)),
    linear-gradient(#fff,#fff);
}
.foot-brand__line{
  margin-top:1rem;font-size:1rem;line-height:1.7;color:rgba(247,245,239,.82);
  max-width:16em;
}
.foot-brand__issue{
  margin-top:.75rem;
  font-size:.78rem;letter-spacing:.06em;color:rgba(247,245,239,.58);
}
.foot-brand__issue .mono{color:var(--fy);font-weight:600}
.foot-col__title{
  margin-bottom:.9rem;
  font-family:var(--ff-mono);font-size:.68rem;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;color:var(--fy);
}
.foot-list li{border-top:1px solid rgba(247,245,239,.16)}
.foot-list a{
  display:block;padding:.62rem 0;font-size:.94rem;
  color:rgba(247,245,239,.86);
  transition:color var(--t) var(--ease),background-color var(--t) var(--ease),padding-left var(--t) var(--ease);
}
.foot-list li:nth-child(1) a{padding-left:0}
.foot-list li:nth-child(2) a{padding-left:.45rem}
.foot-list li:nth-child(3) a{padding-left:.9rem}
.foot-list li:nth-child(4) a{padding-left:1.35rem}
.foot-list li:nth-child(5) a{padding-left:1.8rem}
.foot-list li:nth-child(6) a{padding-left:2.25rem}
.foot-list a:hover{
  color:#fff;
  background-image:linear-gradient(90deg,rgba(231,184,75,.16),transparent 70%);
}
.foot-contact{display:grid;gap:.7rem}
.foot-contact li{display:grid;gap:.1rem;border-top:1px solid rgba(247,245,239,.16);padding-top:.55rem}
.foot-contact li:first-child{border-top:0;padding-top:0}
.foot-contact__k{
  font-family:var(--ff-mono);font-size:.64rem;letter-spacing:.14em;
  color:rgba(247,245,239,.5);
}
.foot-contact__v{
  font-size:.92rem;line-height:1.6;color:rgba(247,245,239,.9);
  overflow-wrap:anywhere;
}
.foot-note{
  margin-top:1rem;max-width:28em;
  font-size:.8rem;line-height:1.72;color:rgba(247,245,239,.58);
}
.site-foot__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.5rem 1rem;
  padding-block:1.1rem 1.4rem;
  border-top:1px solid rgba(247,245,239,.18);
  font-family:var(--ff-mono);font-size:.74rem;letter-spacing:.08em;
  color:rgba(247,245,239,.62);
}
.foot-copy{margin:0}

/* ===== 13 reduced motion ===== */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .js-reveal [data-reveal]:not(.is-in){opacity:1;transform:none}
  .brand:hover .brand__mark{transform:none}
}