/* ============ reset ============ */
*,
*::before,
*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
[hidden]{display:none !important}

/* ============ tokens ============ */
:root{
  --night:#0B1220;
  --stand:#131E33;
  --line:#22314C;
  --green:#35F2A0;
  --cyan:#2BE0D0;
  --orange:#FF7A1A;
  --amber:#FFC24B;
  --white:#E9F1F7;
  --mist:#9AA9BC;
  --deep-green:#0E3A2E;

  --mono:'JetBrains Mono','IBM Plex Mono','Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,monospace;
  --sans:'Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;

  --wrap:1280px;
  --header-h:56px;
  --cut:12px;
  --read-progress:0;
  --gap:24px;
}

/* ============ base ============ */
body{
  min-height:100vh;
  background-color:var(--night);
  background-image:
    linear-gradient(rgba(34,49,76,.30) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,49,76,.18) 1px,transparent 1px),
    radial-gradient(1100px 560px at 80% -8%,rgba(43,224,208,.13),transparent 62%),
    radial-gradient(880px 480px at 4% 6%,rgba(53,242,160,.07),transparent 66%);
  background-size:100% 48px,64px 100%,100% 100%,100% 100%;
  color:var(--white);
  font-family:var(--sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
}
h1,h2,h3,h4{font-weight:800;line-height:1.22;letter-spacing:-.01em}
h1{font-size:clamp(28px,5vw,52px)}
h2{font-size:clamp(22px,3vw,34px)}
h3{font-size:clamp(18px,2vw,22px)}
p{max-width:64ch}
strong{font-weight:700}
::selection{background:rgba(53,242,160,.28);color:var(--white)}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}

@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

/* ============ skip link ============ */
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--green);color:var(--night);
  padding:10px 16px;font-family:var(--mono);font-size:12px;letter-spacing:.08em;
  text-decoration:none;border-radius:0 0 8px 0;
}
.skip-link:focus{left:0}

/* ============ header ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(11,18,32,.93);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.read-progress{position:absolute;left:0;right:0;bottom:-1px;height:3px;overflow:hidden;background:transparent}
.read-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--cyan),var(--green) 55%,var(--orange));
  transform:scaleX(var(--read-progress));
  transform-origin:left center;
  transition:transform .12s linear;
}
.site-header__inner{
  display:flex;align-items:center;gap:18px;
  height:var(--header-h);max-width:var(--wrap);margin:0 auto;padding:0 24px;
}

/* brand */
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto}
.brand__mark{
  display:grid;place-items:center;width:28px;height:28px;
  background:linear-gradient(135deg,var(--green),var(--cyan));
  color:var(--night);font-family:var(--mono);font-weight:700;font-size:13px;
  clip-path:polygon(0 0,calc(100% - 8px) 0,100% 8px,100% 100%,8px 100%,0 calc(100% - 8px));
}
.brand__text{display:flex;flex-direction:column;line-height:1.05}
.brand__name{font-size:15px;font-weight:800;letter-spacing:.06em}
.brand__tag{font-family:var(--mono);font-size:9px;letter-spacing:.14em;color:var(--mist)}

/* nav */
.nav{flex:1 1 auto;min-width:0}
.nav__list{display:flex;align-items:center;gap:2px;overflow-x:auto;scrollbar-width:none}
.nav__list::-webkit-scrollbar{display:none}
.nav__item{margin:0}
.nav__link{
  display:inline-flex;align-items:center;gap:7px;
  padding:7px 10px;border-radius:6px;text-decoration:none;
  color:var(--mist);font-size:14px;white-space:nowrap;
  transition:color .18s ease,background-color .18s ease;
}
.nav__idx{font-family:var(--mono);font-size:11px;color:rgba(154,169,188,.55);font-variant-numeric:tabular-nums}
.nav__link:hover{color:var(--white);background:rgba(34,49,76,.55)}
.nav__link:hover .nav__idx{color:var(--cyan)}
.nav__link[aria-current="page"]{color:var(--green);background:rgba(53,242,160,.09)}
.nav__link[aria-current="page"] .nav__idx{color:var(--green)}
.nav__link[aria-current="page"] .nav__label::after{
  content:"";display:inline-block;width:5px;height:5px;margin-left:7px;
  vertical-align:middle;border-radius:50%;background:var(--green);
  box-shadow:0 0 0 3px rgba(53,242,160,.16);
}

/* header utilities */
.header-utils{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.round-status{
  display:inline-flex;align-items:center;gap:7px;max-width:none;
  font-family:var(--mono);font-size:11px;color:var(--mist);
  border:1px solid var(--line);border-radius:999px;padding:4px 10px;white-space:nowrap;
}
.round-status__dot{width:6px;height:6px;border-radius:50%;background:var(--green);animation:pulse 1.8s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}

.cmd-btn{
  display:inline-flex;align-items:center;gap:8px;
  background:transparent;border:1px solid var(--line);border-radius:6px;
  color:var(--mist);font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  padding:5px 9px;cursor:pointer;
  transition:border-color .18s ease,color .18s ease;
}
.cmd-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.cmd-btn__key{
  display:inline-grid;place-items:center;min-width:16px;height:16px;padding:0 3px;
  border:1px solid var(--line);border-radius:3px;font-size:10px;
}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  background:transparent;border:1px solid var(--line);border-radius:6px;
  color:var(--white);font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  padding:7px 10px;cursor:pointer;
}
.nav-toggle__bar{position:relative;display:block;width:16px;height:2px;background:var(--green);transition:background-color .2s ease}
.nav-toggle__bar::before,
.nav-toggle__bar::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:var(--green);
  transition:transform .2s ease;
}
.nav-toggle__bar::before{top:-5px}
.nav-toggle__bar::after{top:5px}
.site-header[data-open="true"] .nav-toggle{border-color:var(--green);color:var(--green)}
.site-header[data-open="true"] .nav-toggle__bar{background:transparent}
.site-header[data-open="true"] .nav-toggle__bar::before{transform:translateY(5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bar::after{transform:translateY(-5px) rotate(-45deg)}

/* command bar */
.cmdbar{
  position:absolute;left:0;right:0;top:var(--header-h);
  background:rgba(19,30,51,.985);
  border-bottom:1px solid var(--line);
  box-shadow:0 26px 52px rgba(0,0,0,.5);
}
.cmdbar__inner{max-width:var(--wrap);margin:0 auto;padding:18px 24px 22px;display:grid;gap:14px}
.cmdbar__title{
  max-width:none;margin:0;font-family:var(--mono);font-size:11px;
  letter-spacing:.16em;color:var(--white);text-transform:uppercase;
}
.cmdbar__hint{margin-left:10px;color:var(--mist);letter-spacing:0;text-transform:none}
.cmdbar__chips{display:flex;flex-wrap:wrap;gap:8px}
.cmdbar__chip{
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  padding:5px 11px;border-radius:999px;border:1px solid var(--line);
  background:transparent;color:var(--mist);cursor:pointer;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.cmdbar__chip:hover{color:var(--white);border-color:var(--mist)}
.cmdbar__chip[aria-pressed="true"]{color:var(--green);border-color:var(--green);background:rgba(53,242,160,.1)}
.cmdbar__grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:8px}
.cmdbar__item{margin:0}
.cmdbar__link{
  display:flex;align-items:baseline;gap:10px;
  padding:10px 12px;font-size:14px;text-decoration:none;
  color:var(--white);background:rgba(34,49,76,.35);
  border-left:2px solid var(--line);
  transition:border-color .18s ease,color .18s ease,background-color .18s ease;
}
.cmdbar__link:hover{border-left-color:var(--green);color:var(--green);background:rgba(53,242,160,.07)}
.cmdbar__idx{font-family:var(--mono);font-size:10px;letter-spacing:.08em;color:var(--mist)}
.cmdbar__link:hover .cmdbar__idx{color:var(--green)}

/* ============ buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 16px;font-size:14px;font-weight:600;line-height:1;
  text-decoration:none;border:1px solid transparent;cursor:pointer;
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,10px 100%,0 calc(100% - 10px));
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn--sm{padding:7px 13px;font-size:13px}
.btn--primary{background:var(--green);color:var(--night);box-shadow:inset 0 -2px 0 var(--deep-green)}
.btn--primary:hover{background:var(--cyan)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--white)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn:focus-visible{outline:none;box-shadow:0 0 0 2px var(--night),0 0 0 4px var(--cyan)}
.header-cta{white-space:nowrap}

/* ============ footer ============ */
.site-footer{
  position:relative;margin-top:88px;
  background:linear-gradient(180deg,#0B1220 0%,#0E1729 42%,#0B1220 100%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:-1px;height:2px;
  background:linear-gradient(90deg,var(--green),var(--cyan) 38%,var(--line) 72%,var(--orange));
}
.footer__wrap{max-width:var(--wrap);margin:0 auto;padding:48px 24px 26px;display:grid;gap:40px}
.footer__top{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:32px}

.footer__brand{min-width:0}
.footer__name{max-width:none;font-size:20px;font-weight:800;letter-spacing:.06em;margin-bottom:6px}
.footer__tagline{max-width:34ch;color:var(--mist);font-size:13px;margin-bottom:12px}
.footer__mono{max-width:none;font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:rgba(154,169,188,.65)}

.footer-index__title{
  margin-bottom:14px;font-family:var(--mono);font-size:11px;font-weight:500;
  letter-spacing:.16em;color:var(--mist);text-transform:uppercase;
}
.footer-index__list{display:grid;gap:9px}
.footer-index__link{
  display:inline-flex;align-items:baseline;gap:9px;
  font-size:14px;text-decoration:none;color:var(--white);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-index__link:hover{color:var(--green);border-bottom-color:var(--green)}
.footer-idx{font-family:var(--mono);font-size:10px;color:rgba(154,169,188,.6);font-variant-numeric:tabular-nums}

/* season strip */
.season-strip{
  position:relative;padding:20px 22px 48px;
  background:rgba(19,30,51,.72);
  border:1px solid var(--line);
  box-shadow:inset 2px 0 0 var(--green);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.season-strip__head{display:flex;flex-wrap:wrap;gap:12px;align-items:baseline;justify-content:space-between;margin-bottom:20px}
.season-strip__title{max-width:none;font-size:14px;font-weight:700;letter-spacing:.04em}
.season-strip__meta{max-width:none;font-family:var(--mono);font-size:12px;color:var(--cyan);font-variant-numeric:tabular-nums}
.season-strip__track{position:relative;height:6px;border-radius:3px;background:rgba(34,49,76,.95)}
.season-strip__fill{
  position:absolute;left:0;top:0;height:6px;width:89%;border-radius:3px;
  background:linear-gradient(90deg,var(--cyan),var(--green));
}
.season-strip__mark{
  position:absolute;top:-12px;left:89%;transform:translateX(-50%);
  font-family:var(--mono);font-size:10px;line-height:1.5;
  padding:1px 6px;border:1px solid var(--green);border-radius:3px;
  background:var(--night);color:var(--white);font-variant-numeric:tabular-nums;
}
.season-strip__flag{
  position:absolute;top:16px;padding-left:11px;
  font-family:var(--mono);font-size:10px;letter-spacing:.1em;
  color:var(--orange);white-space:nowrap;
}
.season-strip__flag::before{
  content:"";position:absolute;left:0;top:4px;
  width:0;height:0;
  border-top:4px solid transparent;
  border-bottom:4px solid transparent;
  border-left:8px solid var(--orange);
}
.season-strip__flag--summer{left:7%}
.season-strip__flag--winter{left:54%}

/* contact + legal */
.footer__bottom{
  display:grid;grid-template-columns:1.5fr 1fr;gap:32px;
  padding-top:28px;border-top:1px solid var(--line);
}
.footer-contact__title{
  margin-bottom:14px;font-family:var(--mono);font-size:11px;font-weight:500;
  letter-spacing:.16em;color:var(--mist);text-transform:uppercase;
}
.footer-contact__list{display:grid;gap:9px;margin-bottom:14px}
.footer-contact__item{display:flex;flex-wrap:wrap;gap:10px;align-items:baseline;max-width:none;font-size:14px}
.footer-contact__label{
  font-family:var(--mono);font-size:10px;letter-spacing:.08em;
  color:var(--green);min-width:60px;
}
.footer-contact__value{color:var(--white);word-break:break-all}
.footer-contact__note{max-width:52ch;font-size:12px;line-height:1.7;color:var(--mist)}

.footer__legal{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:10px 20px}
.footer__legal-link{
  font-size:13px;text-decoration:none;color:var(--mist);
  border-bottom:1px dashed rgba(154,169,188,.45);
  transition:color .18s ease,border-color .18s ease;
}
.footer__legal-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer__copy{max-width:none;font-family:var(--mono);font-size:11px;letter-spacing:.05em;color:rgba(154,169,188,.7)}

/* ============ shared page primitives ============ */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.section{padding:72px 0}
.section--tight{padding:48px 0}

.chapter-head{
  display:grid;grid-template-columns:auto 1fr;gap:10px 16px;align-items:baseline;
  margin-bottom:28px;padding-bottom:14px;border-bottom:1px solid var(--line);
  transition:opacity .35s ease;
}
.chapter-head__idx{font-family:var(--mono);font-size:13px;letter-spacing:.12em;color:var(--green);font-variant-numeric:tabular-nums}
.chapter-head__title{max-width:none;font-size:clamp(22px,3vw,34px)}
.chapter-head__meta{
  grid-column:2;max-width:none;
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--mist);
}
[data-chapter]{scroll-margin-top:80px;transition:opacity .35s ease}
[data-chapter][data-state="idle"] .chapter-head{opacity:.4}
[data-chapter][data-state="active"] .chapter-head{opacity:1}
[data-chapter][data-state="active"] .chapter-head__title{color:var(--white)}
[data-toc-link][data-active="true"]{color:var(--green);border-color:var(--green)}

.lede{max-width:42ch;font-size:17px;line-height:1.85;color:rgba(233,241,247,.88)}

.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:20px;font-family:var(--mono);font-size:11px;color:var(--mist)}
.breadcrumb__item{display:inline-flex;gap:8px;align-items:center;max-width:none}
.breadcrumb__item a{text-decoration:none;color:var(--mist);transition:color .18s ease}
.breadcrumb__item a:hover{color:var(--cyan)}
.breadcrumb__sep{color:var(--line)}

.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--gap)}
.col-main{grid-column:1 / span 7;min-width:0}
.col-side{grid-column:9 / span 4;min-width:0}

/* == data blocks == */
.data-panel{
  padding:22px;
  background:rgba(19,30,51,.78);
  border:1px solid var(--line);
  box-shadow:inset 2px 0 0 var(--green);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.data-panel--orange{box-shadow:inset 2px 0 0 var(--orange)}
.data-panel__head{display:flex;flex-wrap:wrap;gap:12px;align-items:baseline;justify-content:space-between;margin-bottom:14px}
.data-panel__label{max-width:none;font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--mist)}
.data-panel__value{max-width:none;font-family:var(--mono);font-size:26px;color:var(--white);font-variant-numeric:tabular-nums}

.stat-score{display:grid;gap:8px;padding:24px 0}
.stat-score__value{
  max-width:none;font-family:var(--mono);font-weight:700;
  font-size:clamp(54px,10vw,116px);line-height:.9;letter-spacing:-.03em;
  color:var(--white);font-variant-numeric:tabular-nums;
}
.stat-score__unit{margin-left:10px;font-family:var(--mono);font-size:14px;color:var(--green);letter-spacing:.06em}
.stat-score__label{max-width:none;font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--mist)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--line);border-radius:3px;
  font-family:var(--mono);font-size:10px;letter-spacing:.1em;
  color:var(--mist);white-space:nowrap;
}
.tag--green{color:var(--green);border-color:rgba(53,242,160,.45);background:rgba(53,242,160,.08)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,26,.45);background:rgba(255,122,26,.08)}
.tag--amber{color:var(--amber);border-color:rgba(255,194,75,.45);background:rgba(255,194,75,.08)}
.tag--cyan{color:var(--cyan);border-color:rgba(43,224,208,.45);background:rgba(43,224,208,.08)}

/* == media == */
.media-frame{
  position:relative;overflow:hidden;width:100%;aspect-ratio:16 / 9;
  background-color:#101A2C;
  background-image:
    linear-gradient(rgba(34,49,76,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,49,76,.55) 1px,transparent 1px);
  background-size:32px 32px;
  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)));
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame__img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  filter:saturate(.72) contrast(1.08) brightness(.9);
}
.media-frame__scan{
  position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(233,241,247,.055) 0 1px,transparent 1px 4px);
}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;max-width:none;
  padding:11px 13px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  color:var(--mist);background:linear-gradient(180deg,transparent,rgba(11,18,32,.92));
}

/* ============ responsive ============ */
@media (max-width:1080px){
  .round-status{display:none}
}
@media (max-width:980px){
  .wrap{padding:0 18px}
  .site-header__inner{padding:0 16px;gap:12px}
  .nav-toggle{display:inline-flex}
  .nav{
    position:fixed;left:0;right:0;top:var(--header-h);
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
    display:none;padding:8px 0 18px;
    background:rgba(11,18,32,.99);
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 52px rgba(0,0,0,.55);
  }
  .site-header[data-open="true"] .nav{display:block}
  .nav__list{flex-direction:column;align-items:stretch;gap:0;padding:0 16px;overflow:visible}
  .nav__item{border-bottom:1px solid rgba(34,49,76,.7)}
  .nav__item:last-child{border-bottom:0}
  .nav__link{width:100%;padding:15px 10px;font-size:16px;border-radius:0}
  .nav__link:hover{background:rgba(34,49,76,.35)}
  .nav__link[aria-current="page"] .nav__label::after{display:none}
  .nav__link[aria-current="page"]{border-left:2px solid var(--green)}
  .cmdbar{position:fixed;top:var(--header-h);max-height:calc(100vh - var(--header-h));overflow-y:auto}
  .grid-12{grid-template-columns:1fr}
  .col-main,.col-side{grid-column:1 / -1}
  .section{padding:52px 0}
  .footer__top{grid-template-columns:1fr 1fr;gap:26px}
  .footer__bottom{grid-template-columns:1fr;gap:26px}
}
@media (max-width:640px){
  body{font-size:15px}
  .brand__tag{display:none}
  .cmd-btn__label{display:none}
  .header-cta{display:none}
  .footer__wrap{padding:36px 16px 22px;gap:32px}
  .footer__top{grid-template-columns:1fr}
  .season-strip{padding:18px 16px 46px}
  .season-strip__flag--winter{left:48%}
  .cmdbar__inner{padding:16px}
  .cmdbar__grid{grid-template-columns:1fr}
}

/* ============ reduced motion ============ */
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html{scroll-behavior:auto}
  .read-progress__bar{transition:none}
}