:root{
  --ice-blue:#071A33;
  --midnight:#0B2747;
  --aurora:#2DE2E6;
  --track-orange:#FF5A1F;
  --score-red:#E63946;
  --lime:#D7FF3F;
  --ice-white:#F4F8FB;
  --steel:#8FA3B8;
  --fog:#D9E6F2;
  --ink:#02060D;

  --line:rgba(143,163,184,.24);
  --line-soft:rgba(143,163,184,.14);
  --line-cyan:rgba(45,226,230,.34);

  --font-display:"Barlow Condensed","Arial Narrow","Helvetica Neue",Arial,sans-serif;
  --font-mono:"Roboto Mono","DIN Alternate",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;

  --max-w:1280px;
  --gutter:clamp(1.05rem,4vw,2.75rem);
  --header-h:76px;
  --gap:clamp(1rem,2.4vw,1.75rem);

  --cut:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%);
  --cut-sm:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-padding-top:calc(var(--header-h) + 1rem);
}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

body{
  margin:0;
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.75;
  color:var(--ice-white);
  background-color:var(--ice-blue);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.06;
  letter-spacing:.02em;
}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
figure{margin:0}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
strong,b{font-weight:700}

:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
  border-radius:2px;
}
.skip-link:focus-visible{outline-offset:2px}

/* ── layout ────────────────────────────────────── */
.container{
  width:min(var(--max-w),calc(100% - (var(--gutter) * 2)));
  margin-inline:auto;
}

.section{
  position:relative;
  padding-block:clamp(2.6rem,6vw,5rem);
}
.section--dark{background:var(--ice-blue);color:var(--ice-white)}
.section--panel{background:var(--midnight);color:var(--ice-white)}
.section--fog{background:var(--fog);color:var(--ice-blue)}
.section--white{background:var(--ice-white);color:var(--midnight)}

.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.grid--split{grid-template-columns:minmax(0,1fr)}
@media (min-width:900px){
  .grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(1.5rem,4vw,3.5rem)}
}

.divider{
  height:1px;
  border:0;
  background:linear-gradient(90deg,var(--line-cyan),transparent 72%);
  margin-block:clamp(1.6rem,4vw,2.6rem);
}

.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;border:0;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  overflow:hidden;white-space:nowrap;
}

/* ── typography utilities ──────────────────────── */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--aurora);
}
.eyebrow::before{
  content:"";
  width:26px;height:1px;
  background:currentColor;
  flex:none;
}
.section--fog .eyebrow,.section--white .eyebrow{color:#0d6b78}

.lede{
  font-size:clamp(1.02rem,1.6vw,1.2rem);
  line-height:1.75;
  color:var(--fog);
  max-width:46ch;
}
.section--fog .lede,.section--white .lede{color:#26405c}

.prose{
  max-width:68ch;
  font-size:1rem;
  line-height:1.85;
}
.prose > * + *{margin-top:1.05em}
.prose h2{
  font-size:clamp(1.4rem,3vw,1.9rem);
  letter-spacing:.04em;
  margin-top:2em;
}
.prose h3{
  font-size:1.1rem;
  letter-spacing:.06em;
  margin-top:1.6em;
}
.prose a{color:var(--aurora);text-decoration:underline;text-underline-offset:3px}
.section--fog .prose a,.section--white .prose a{color:#0d6b78}
.prose ul{list-style:none}
.prose ul li{
  position:relative;
  padding-left:1.1rem;
}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:6px;height:1.5px;
  background:var(--track-orange);
}

.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:700;
  letter-spacing:-.01em;
}

/* ── tags ──────────────────────────────────────── */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.18rem .55rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--aurora);
  border:1px solid var(--line-cyan);
  background:rgba(45,226,230,.08);
}
.tag--orange{
  color:var(--track-orange);
  border-color:rgba(255,90,31,.5);
  background:rgba(255,90,31,.1);
}
.tag--lime{
  color:var(--lime);
  border-color:rgba(215,255,63,.45);
  background:rgba(215,255,63,.1);
}

/* ── buttons ───────────────────────────────────── */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  padding:.86rem 1.55rem;
  font-family:var(--font-display);
  font-size:.9rem;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  border:1px solid transparent;
  clip-path:var(--cut-sm);
  transition:transform .18s ease,background-color .2s ease,color .2s ease,border-color .2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--track-orange);color:#fff}
.btn--primary:hover{background:#ff743f}
.btn--ghost{border-color:var(--line-cyan);color:var(--aurora);background:transparent}
.btn--ghost:hover{background:rgba(45,226,230,.14);color:var(--ice-white)}
.btn--quiet{
  background:rgba(217,230,242,.1);
  border-color:var(--line);
  color:var(--ice-white);
}
.btn--quiet:hover{background:rgba(217,230,242,.18)}

/* ── panel ─────────────────────────────────────── */
.panel{
  background:var(--midnight);
  border:1px solid var(--line);
  padding:clamp(1.1rem,2.4vw,1.6rem);
}
.section--fog .panel,.section--white .panel{
  background:#fff;
  border-color:rgba(11,39,71,.14);
  color:var(--midnight);
}

/* ── media containers ──────────────────────────── */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 10;
  background:var(--midnight);
  border:1px solid var(--line);
}
.media--wide{aspect-ratio:21 / 9}
.media--portrait{aspect-ratio:3 / 4}
.media--frame{
  border-color:var(--line-cyan);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 26px),calc(100% - 26px) 100%,0 100%);
}
.media__img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media__placeholder{
  display:grid;
  place-items:center;
  width:100%;
  height:100%;
  padding:1rem;
  text-align:center;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--steel);
  background:
    repeating-linear-gradient(-45deg,rgba(45,226,230,.09) 0 10px,transparent 10px 22px),
    linear-gradient(160deg,var(--midnight),var(--ice-blue));
}
.media__tag{
  position:absolute;
  left:0;bottom:0;
  padding:.34rem .7rem;
  background:var(--ice-blue);
  color:var(--lime);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.18em;
}
.media__caption{
  margin-top:.6rem;
  font-size:.78rem;
  letter-spacing:.06em;
  line-height:1.6;
  color:var(--steel);
}
.section--fog .media__caption,.section--white .media__caption{color:#4a6178}

/* ── table ─────────────────────────────────────── */
.table-scroll{
  width:100%;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.data-table{
  width:100%;
  border-collapse:collapse;
  font-size:.88rem;
  min-width:520px;
}
.data-table th{
  font-family:var(--font-display);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  text-align:left;
  padding:.7rem .85rem;
  color:var(--steel);
  border-bottom:1px solid var(--line);
  white-space:nowrap;
}
.data-table td{
  padding:.78rem .85rem;
  border-bottom:1px solid var(--line-soft);
  vertical-align:top;
}
.data-table tbody tr:hover td{background:rgba(45,226,230,.06)}
.data-table .num{color:var(--lime)}
.section--fog .data-table th,.section--white .data-table th{color:#4a6178;border-bottom-color:rgba(11,39,71,.2)}
.section--fog .data-table td,.section--white .data-table td{border-bottom-color:rgba(11,39,71,.1)}
.section--fog .data-table .num,.section--white .data-table .num{color:#0d6b78}

/* ── breadcrumb ────────────────────────────────── */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--steel);
  padding-block:1.1rem 0;
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.45rem}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:rgba(143,163,184,.5);
}
.breadcrumb a{color:var(--fog);transition:color .2s ease}
.breadcrumb a:hover{color:var(--aurora)}
.breadcrumb [aria-current="page"]{color:var(--lime)}

/* ── header ────────────────────────────────────── */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  color:var(--ice-white);
  background:linear-gradient(180deg,rgba(7,26,51,.985),rgba(7,26,51,.93));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:rgba(143,163,184,.16);
  overflow:hidden;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--aurora),var(--lime) 55%,var(--track-orange));
  box-shadow:0 0 10px rgba(45,226,230,.7);
  transition:width .14s linear;
}

.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-100px;
  z-index:200;
  padding:.6rem 1.05rem;
  background:var(--lime);
  color:var(--ice-blue);
  font-family:var(--font-display);
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
  transition:top .2s ease;
}
.skip-link:focus{top:.55rem}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(.7rem,2vw,1.8rem);
  min-height:var(--header-h);
  padding-block:.5rem;
}

/* brand */
.brand{
  display:inline-flex;
  align-items:center;
  gap:.68rem;
  flex:none;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:38px;height:38px;
  flex:none;
  font-family:var(--font-display);
  font-size:1rem;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--ice-blue);
  background:var(--lime);
  clip-path:polygon(0 0,100% 0,100% 70%,80% 100%,0 100%);
}
.brand__text{
  display:flex;
  flex-direction:column;
  line-height:1.05;
}
.brand__name{
  font-family:var(--font-display);
  font-size:1.02rem;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--ice-white);
}
.brand__tag{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.34em;
  text-transform:uppercase;
  color:var(--aurora);
}

/* center meter */
.header-meter{
  display:none;
  align-items:center;
  gap:.4rem;
  margin-inline:auto;
}
.header-meter__label{
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--steel);
  margin-right:.25rem;
}
.chip{
  display:inline-flex;
  align-items:center;
  padding:.2rem .62rem;
  font-size:.7rem;
  letter-spacing:.14em;
  color:var(--steel);
  border:1px solid var(--line);
  border-radius:999px;
  white-space:nowrap;
}
.chip--on{
  color:var(--ice-blue);
  background:var(--aurora);
  border-color:var(--aurora);
  font-weight:700;
}

/* nav */
.header-nav{
  display:flex;
  align-items:center;
  gap:.7rem;
  margin-left:auto;
}
.nav__list{
  display:flex;
  align-items:center;
  gap:clamp(.35rem,1.3vw,1.3rem);
}
.nav__item{display:flex}
.nav__link{
  position:relative;
  display:inline-block;
  padding:.5rem .1rem;
  font-family:var(--font-body);
  font-size:.82rem;
  letter-spacing:.14em;
  color:var(--fog);
  white-space:nowrap;
  transition:color .2s ease;
}
.nav__link::after{
  content:"";
  position:absolute;
  left:0;right:100%;bottom:.18rem;
  height:2px;
  background:var(--track-orange);
  transition:right .28s cubic-bezier(.2,.8,.3,1);
}
.nav__link:hover{color:var(--ice-white)}
.nav__link:hover::after{right:0}
.nav__link[aria-current="page"]{color:var(--lime)}
.nav__link[aria-current="page"]::after{right:0;background:var(--lime)}

/* toggle */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.52rem .78rem;
  border:1px solid var(--line-cyan);
  color:var(--fog);
  font-family:var(--font-display);
  font-size:.72rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  transition:color .2s ease,border-color .2s ease;
}
.nav-toggle:hover{color:var(--aurora);border-color:var(--aurora)}
.nav-toggle__bars{
  display:grid;
  gap:4px;
  width:16px;
  flex:none;
}
.nav-toggle__bars span{
  display:block;
  height:1.5px;
  background:currentColor;
  transition:transform .22s ease;
}
.site-header[data-open] .nav-toggle__bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}

@media (min-width:1100px){
  .header-meter{display:flex}
}
@media (min-width:981px){
  .nav-toggle{display:none}
}

@media (max-width:980px){
  .nav{
    position:absolute;
    top:100%;left:0;right:0;
    display:none;
    z-index:70;
    padding:.4rem var(--gutter) 1.15rem;
    background:var(--midnight);
    border-bottom:1px solid var(--line-cyan);
    box-shadow:0 26px 48px rgba(2,6,13,.62);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
  }
  .site-header[data-open] .nav{display:block}
  .nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav__link{
    display:block;
    padding:.9rem .25rem;
    font-size:.95rem;
    letter-spacing:.12em;
    border-bottom:1px solid var(--line-soft);
  }
  .nav__link::after{display:none}
  .nav__link:hover{color:var(--aurora)}
  .nav__link[aria-current="page"]{
    color:var(--lime);
    padding-left:.95rem;
    box-shadow:inset 3px 0 0 var(--track-orange);
    background:rgba(215,255,63,.06);
  }
  .brand__name{font-size:.95rem}
  .brand__tag{font-size:.55rem;letter-spacing:.28em}
}

/* ── footer ────────────────────────────────────── */
.site-footer{
  position:relative;
  padding-top:clamp(2.6rem,6vw,4.5rem);
  color:var(--fog);
  border-top:1px solid var(--line-cyan);
  background:
    radial-gradient(120% 90% at 84% 0%,rgba(45,226,230,.11),transparent 56%),
    radial-gradient(90% 70% at 8% 100%,rgba(255,90,31,.09),transparent 60%),
    linear-gradient(180deg,#04101f 0%,var(--ink) 100%);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:1px;
  background:linear-gradient(90deg,var(--track-orange),var(--aurora) 38%,transparent 88%);
  opacity:.7;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(1.9rem,4vw,3rem);
  padding-bottom:clamp(2rem,4vw,3rem);
}
@media (min-width:860px){
  .footer-top{
    grid-template-columns:minmax(0,1.05fr) minmax(0,2fr);
    gap:clamp(2rem,5vw,4.5rem);
  }
}

.footer-brand .brand{margin-bottom:1rem}
.footer-summary{
  font-size:.92rem;
  line-height:1.8;
  color:var(--fog);
  max-width:34ch;
}
.footer-meta{
  margin-top:.85rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  line-height:1.9;
  color:var(--steel);
}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(148px,1fr));
  gap:1.7rem 2rem;
}
.footer-col__title{
  font-family:var(--font-display);
  font-size:.74rem;
  font-weight:600;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--aurora);
  margin-bottom:.85rem;
}
.footer-list a{
  display:inline-block;
  padding:.26rem 0;
  font-size:.9rem;
  color:var(--fog);
  transition:color .2s ease,transform .2s ease;
}
.footer-list a:hover{color:var(--lime);transform:translateX(3px)}

.footer-list--contact{display:grid;gap:.6rem}
.footer-list--contact li{
  display:grid;
  gap:.1rem;
  padding-bottom:.5rem;
  border-bottom:1px solid rgba(143,163,184,.14);
}
.footer-key{
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--steel);
}
.footer-val{
  font-size:.86rem;
  line-height:1.6;
  color:var(--fog);
  word-break:break-word;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.45rem 1.6rem;
  padding-block:1.15rem 1.9rem;
  border-top:1px solid rgba(143,163,184,.18);
  font-size:.76rem;
  letter-spacing:.08em;
  color:var(--steel);
}
.footer-bottom__icp{
  font-family:var(--font-mono);
  letter-spacing:.12em;
  color:var(--fog);
}
.footer-bottom__note{
  font-family:var(--font-mono);
  letter-spacing:.1em;
}
.footer-bottom__note [data-year]{color:var(--lime)}

/* ── scroll interactions ───────────────────────── */
.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s ease,transform .55s ease;
}
.js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}
[data-chapter]{
  border-left:2px solid transparent;
  padding-left:1rem;
  transition:border-color .3s ease,background-color .3s ease;
}
[data-chapter].is-current{
  border-left-color:var(--track-orange);
  background:rgba(45,226,230,.06);
}

/* ── 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;
    scroll-behavior:auto !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .btn:hover,.footer-list a:hover{transform:none}
}