:root{
  --ink-900:#0B1522;
  --ink-800:#101F33;
  --ink-700:#17304C;
  --solar-500:#FF7A18;
  --solar-600:#EE6C0E;
  --solar-300:#FFB347;
  --solar-100:#FFE7C9;
  --mint-400:#2BE8B8;
  --volt-500:#7C5CFF;
  --paper-050:#F5F7FA;
  --steel-400:#93A6BA;
  --text-dim:rgba(245,247,250,.76);
  --rail-w:68px;
  --bar-h:76px;
  --bar-h-sm:56px;
  --maxw:1280px;
  --gutter:24px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-serif:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  padding-left:var(--rail-w);
  padding-top:var(--bar-h);
  background:var(--ink-900);
  color:var(--paper-050);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0;}
:focus-visible{outline:2px solid var(--mint-400);outline-offset:3px;}
::selection{background:var(--solar-500);color:var(--ink-900);}

h1,.h1{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(32px,5vw,64px);
  line-height:1.05;
  letter-spacing:-.02em;
}
h2{font-family:var(--font-display);font-weight:800;font-size:clamp(26px,3vw,36px);line-height:1.15;letter-spacing:-.01em;}
h3{font-family:var(--font-display);font-weight:700;font-size:clamp(19px,2vw,24px);line-height:1.3;}
p{color:var(--text-dim);}

.mono{font-family:var(--font-mono);font-size:.92em;letter-spacing:.03em;}

/* ---------- layout ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(20px,4vw,48px);
}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter);}
.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{position:relative;padding-block:clamp(56px,8vw,112px);}
.section--tint{background:var(--ink-800);}
.section--paper{background:var(--paper-050);color:var(--ink-900);}
.section--paper p,.section--paper .lede{color:rgba(11,21,34,.78);}
.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 20px;
  padding-top:20px;margin-bottom:clamp(28px,4vw,48px);
  border-top:1px solid var(--ink-700);
}
.section--paper .section-head{border-top-color:rgba(11,21,34,.18);}
.section-num{
  font-family:var(--font-serif);
  font-size:clamp(28px,4vw,44px);
  line-height:1;
  color:var(--solar-500);
  letter-spacing:.02em;
}
.section-title{font-family:var(--font-display);font-weight:800;font-size:clamp(22px,2.6vw,32px);line-height:1.2;letter-spacing:-.01em;}
.section-kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--steel-400);}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  color:var(--solar-300);text-transform:uppercase;
}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--solar-500);}
.lede{font-size:clamp(17px,1.6vw,20px);line-height:1.7;color:var(--text-dim);max-width:52ch;}
.rule{height:1px;border:0;background:var(--ink-700);margin-block:clamp(24px,4vw,48px);}
.prose{max-width:70ch;font-size:16.5px;line-height:1.85;color:var(--text-dim);}
.prose > * + *{margin-top:1.1em;}
.prose h2,.prose h3{color:var(--paper-050);margin-top:1.9em;}
.prose strong{color:var(--paper-050);font-weight:700;}
.prose a{color:var(--mint-400);border-bottom:1px solid rgba(43,232,184,.4);}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:18px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;
  color:var(--steel-400);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb__link{color:var(--steel-400);border-bottom:1px solid transparent;transition:color 180ms var(--ease),border-color 180ms var(--ease);}
.breadcrumb__link:hover{color:var(--mint-400);border-bottom-color:var(--mint-400);}
.breadcrumb__sep{color:var(--ink-700);}
.breadcrumb__item[aria-current="page"]{color:var(--paper-050);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;
  border:1px solid transparent;
  border-radius:0;
  font-family:var(--font-body);font-size:14px;font-weight:700;
  letter-spacing:.02em;line-height:1.2;
  background:var(--ink-800);color:var(--paper-050);
  transition:background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),box-shadow 200ms var(--ease);
}
.btn--primary{background:var(--solar-500);color:var(--ink-900);box-shadow:0 14px 32px -20px rgba(255,122,24,.95);}
.btn--primary:hover{background:var(--solar-600);color:var(--ink-900);}
.btn--ghost{background:transparent;border-color:var(--ink-700);color:var(--paper-050);}
.btn--ghost:hover{border-color:var(--mint-400);color:var(--mint-400);}
.btn--sm{padding:9px 14px;font-size:13px;}
.btn--block{display:flex;width:100%;justify-content:space-between;}

/* ---------- tags & chips ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  border:1px solid var(--ink-700);color:var(--steel-400);
  background:rgba(255,255,255,.02);
  white-space:nowrap;
}
.tag--solar{color:var(--solar-300);border-color:rgba(255,179,71,.5);}
.tag--mint{color:var(--mint-400);border-color:rgba(43,232,184,.5);}
.tag--volt{color:var(--volt-500);border-color:rgba(124,92,255,.55);}
.chip{
  display:inline-flex;align-items:center;
  padding:8px 14px;
  border:1px solid var(--ink-700);
  font-size:13px;font-weight:500;color:var(--steel-400);
  background:transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease),background 180ms var(--ease);
}
.chip:hover{color:var(--paper-050);border-color:var(--mint-400);}
.chip.is-active,.chip[aria-pressed="true"]{
  background:var(--solar-500);border-color:var(--solar-500);color:var(--ink-900);font-weight:700;
}

/* ---------- cards ---------- */
.card{
  position:relative;
  display:flex;flex-direction:column;gap:12px;
  padding:clamp(20px,2.4vw,28px);
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  border-radius:0;
  transition:border-color 240ms var(--ease),transform 240ms var(--ease);
}
.card::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  box-shadow:inset 0 0 0 1px transparent;
  transition:box-shadow 240ms var(--ease);
}
.card:hover{border-color:var(--mint-400);transform:translateY(-2px);}
.card:hover::after{box-shadow:inset 0 0 0 1px rgba(43,232,184,.35);}
.card__index{
  font-family:var(--font-serif);font-size:20px;line-height:1;
  color:var(--solar-500);letter-spacing:.04em;
}
.card__tag{position:absolute;top:14px;right:14px;}
.card__title{font-family:var(--font-display);font-weight:700;font-size:19px;line-height:1.35;color:var(--paper-050);}
.card__text{font-size:14.5px;line-height:1.75;color:var(--steel-400);}

/* ---------- media placeholders ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  width:100%;aspect-ratio:16/9;
  background:linear-gradient(135deg,#14263C 0%,#0B1522 70%);
  border:1px solid var(--ink-700);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(120% 90% at 82% 0%,rgba(255,122,24,.22),transparent 62%);
}
.media--hero{aspect-ratio:21/9;}
.media--square{aspect-ratio:1/1;}
.media--portrait{aspect-ratio:3/4;}
.media__img{width:100%;height:100%;object-fit:cover;}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--paper-050);
  background:linear-gradient(0deg,rgba(11,21,34,.92),transparent);
}

/* ---------- state / motion protocol ---------- */
@keyframes solar-flash{
  0%{box-shadow:inset 0 0 0 2px var(--mint-400),0 0 0 4px rgba(43,232,184,.22);}
  100%{box-shadow:inset 0 0 0 0 rgba(43,232,184,0),0 0 0 4px rgba(43,232,184,0);}
}
.is-flash{animation:solar-flash 180ms var(--ease) 1;}
html[data-motion="on"] [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity 320ms var(--ease),transform 320ms var(--ease);
}
html[data-motion="on"] [data-reveal].is-in{opacity:1;transform:none;}

/* =========================================================
   HEADER
   ========================================================= */
.site-header{position:fixed;top:0;left:0;right:0;height:0;z-index:200;}
.skip-link{
  position:fixed;top:10px;left:calc(var(--rail-w) + 12px);z-index:300;
  padding:10px 16px;
  background:var(--mint-400);color:var(--ink-900);
  font-family:var(--font-body);font-size:14px;font-weight:700;
  transform:translateY(-220%);
  transition:transform 180ms var(--ease);
}
.skip-link:focus{transform:translateY(0);}

.frame-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  padding:18px 0 16px;
  background:var(--ink-800);
  border-right:1px solid var(--ink-700);
  z-index:210;
}
.frame-rail::before{
  content:"";position:absolute;top:0;bottom:0;left:50%;width:1px;
  background-image:repeating-linear-gradient(180deg,rgba(147,166,186,.28) 0 1px,transparent 1px 18px);
  opacity:.55;pointer-events:none;
}
.frame-rail__mark{
  width:12px;height:12px;
  background:linear-gradient(135deg,var(--solar-500),var(--solar-300));
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.frame-rail__word{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.34em;
  color:var(--steel-400);
}
.frame-rail__year{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--mint-400);
}
.frame-rail__track{
  position:absolute;right:0;bottom:0;width:2px;height:100%;
  background:var(--ink-700);
}
.frame-rail__bar{
  position:absolute;left:0;bottom:0;width:100%;height:0;
  background:linear-gradient(0deg,var(--solar-500),var(--mint-400));
}

.frame-bar{
  position:fixed;top:0;left:var(--rail-w);right:0;
  height:var(--bar-h);z-index:205;
  background:rgba(11,21,34,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--ink-700);
  transition:height 240ms var(--ease),background 240ms var(--ease);
}
.site-header[data-compact] .frame-bar{height:var(--bar-h-sm);background:rgba(11,21,34,.98);}
.frame-bar__slash{
  position:absolute;top:0;right:0;bottom:0;width:clamp(110px,17vw,260px);
  background:linear-gradient(100deg,rgba(255,122,24,0) 0%,rgba(255,122,24,.16) 56%,rgba(255,179,71,.06) 100%);
  clip-path:polygon(38% 0,100% 0,100% 100%,0 100%);
  pointer-events:none;z-index:1;
}
.frame-bar__inner{
  position:relative;z-index:2;
  width:100%;max-width:var(--maxw);height:100%;
  margin-inline:auto;
  padding-inline:clamp(16px,3vw,40px);
  display:flex;align-items:center;gap:clamp(16px,2.4vw,36px);
}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;}
.brand__glyph{
  width:34px;height:34px;flex:0 0 auto;
  background:linear-gradient(135deg,var(--solar-500),var(--solar-300));
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15;}
.brand__name{
  font-family:var(--font-display);font-weight:900;font-size:17px;
  letter-spacing:-.01em;color:var(--paper-050);white-space:nowrap;
}
.brand__meta{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--steel-400);white-space:nowrap;
  transition:opacity 200ms var(--ease);
}
.site-header[data-compact] .brand__meta{opacity:.55;}

.nav{display:flex;align-items:center;gap:clamp(12px,1.6vw,24px);flex:1 1 auto;min-width:0;}
.nav__list{
  display:flex;align-items:center;gap:clamp(10px,1.4vw,22px);
  overflow-x:auto;scrollbar-width:none;min-width:0;
}
.nav__list::-webkit-scrollbar{display:none;}
.nav__item{flex:0 0 auto;}
.nav__link{
  position:relative;display:inline-block;
  padding:8px 2px;
  font-size:15px;color:var(--steel-400);white-space:nowrap;
  transition:color 200ms var(--ease);
}
.nav__link::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;
  background:linear-gradient(90deg,var(--solar-500),var(--solar-300));
  transition:right 240ms var(--ease);
}
.nav__link:hover{color:var(--paper-050);}
.nav__link:hover::after{right:0;}
.nav__link[aria-current="page"]{color:var(--paper-050);font-weight:700;}
.nav__link[aria-current="page"]::after{right:0;}
.nav__quick{display:flex;align-items:center;gap:8px;margin-left:auto;flex:0 0 auto;}

.nav-toggle{
  display:none;align-items:center;gap:8px;margin-left:auto;
  padding:8px 12px;border:1px solid var(--ink-700);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--paper-050);
  transition:border-color 200ms var(--ease),color 200ms var(--ease);
}
.nav-toggle__bars{
  width:16px;height:10px;flex:0 0 auto;
  background:
    linear-gradient(var(--solar-500),var(--solar-500)) 0 0/100% 2px no-repeat,
    linear-gradient(var(--mint-400),var(--mint-400)) 0 50%/100% 2px no-repeat,
    linear-gradient(var(--paper-050),var(--paper-050)) 0 100%/100% 2px no-repeat;
}
.nav-toggle__label{line-height:1;}
.site-header[data-open] .nav-toggle{border-color:var(--mint-400);color:var(--mint-400);}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer{
  position:relative;
  background:var(--ink-800);
  border-top:1px solid var(--ink-700);
  padding-top:clamp(48px,7vw,88px);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,var(--solar-500),var(--mint-400) 55%,transparent 92%);
}
.footer__glow{
  position:absolute;top:0;right:0;
  width:min(560px,64vw);height:220px;
  background:radial-gradient(120% 100% at 100% 0,rgba(255,122,24,.18),transparent 70%);
  pointer-events:none;
}
.footer__grid{
  position:relative;
  display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gutter);
}
.footer__brand{grid-column:span 4;display:flex;flex-direction:column;gap:16px;}
.footer__statement{
  font-size:15px;line-height:1.75;color:var(--text-dim);
  max-width:24ch;
}
.footer__badge{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--solar-300);
}
.footer__col{grid-column:span 2;min-width:0;}
.footer__col--contact{grid-column:span 4;}
.footer__title{
  margin:0 0 16px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;
  color:var(--steel-400);
}
.footer__list{display:flex;flex-direction:column;gap:2px;}
.footer__link{
  display:inline-block;
  padding:5px 0;
  font-size:14.5px;color:var(--steel-400);
  border-bottom:1px solid transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.footer__link:hover{color:var(--mint-400);border-bottom-color:rgba(43,232,184,.5);}
.footer__contact{display:flex;flex-direction:column;gap:2px;margin-bottom:12px;}
.footer__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--solar-300);
}
.footer__value{
  font-size:14.5px;line-height:1.6;color:var(--paper-050);
  word-break:break-word;overflow-wrap:anywhere;
}
.footer__note{
  margin-top:10px;padding-top:14px;
  border-top:1px solid var(--ink-700);
  font-size:12.5px;line-height:1.7;color:var(--steel-400);
}
.footer__base{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 24px;
  margin-top:clamp(40px,6vw,72px);
  padding-block:20px 28px;
  border-top:1px solid var(--ink-700);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--steel-400);
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width:1200px){
  .brand__meta{display:none;}
  .nav__link{font-size:14px;}
  .nav__quick .btn{padding:8px 12px;font-size:12.5px;}
}
@media (max-width:1023px){
  :root{--rail-w:0px;}
  body{padding-left:0;}
  .frame-rail{display:none;}
  .frame-bar{left:0;-webkit-backdrop-filter:none;backdrop-filter:none;background:var(--ink-900);}
  .frame-bar__slash{width:120px;opacity:.7;}
  .brand__meta{display:block;}
  .nav-toggle{display:inline-flex;}
  .nav{
    position:fixed;top:var(--bar-h);left:0;right:0;bottom:0;
    flex-direction:column;align-items:stretch;gap:0;flex:none;
    padding:24px clamp(20px,6vw,44px) 48px;
    background:var(--ink-900);
    border-top:1px solid var(--ink-700);
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-10px);
    transition:opacity 240ms var(--ease),transform 240ms var(--ease),visibility 240ms var(--ease);
  }
  .site-header[data-compact] .nav{top:var(--bar-h-sm);}
  .site-header[data-open] .nav{opacity:1;visibility:visible;pointer-events:auto;transform:none;}
  .nav__list{flex-direction:column;align-items:stretch;gap:0;overflow:visible;}
  .nav__item{border-bottom:1px solid var(--ink-700);}
  .nav__link{
    display:block;padding:16px 0;
    font-family:var(--font-display);font-size:21px;font-weight:700;
    color:var(--paper-050);
  }
  .nav__link::after{display:none;}
  .nav__link[aria-current="page"]{color:var(--solar-500);padding-left:16px;}
  .nav__link[aria-current="page"]::before{
    content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
    width:3px;height:22px;background:var(--solar-500);
  }
  .nav__quick{
    flex-direction:column;align-items:stretch;gap:10px;
    margin-top:28px;margin-left:0;
  }
  .nav__quick .btn{width:100%;justify-content:center;padding:14px 18px;font-size:14px;}
  html.is-nav-open{overflow:hidden;}
}
@media (max-width:900px){
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12;}
  .footer__brand{grid-column:span 12;}
  .footer__col{grid-column:span 6;}
  .footer__col--contact{grid-column:span 12;}
  .footer__statement{max-width:38ch;}
}
@media (max-width:640px){
  :root{--bar-h:64px;--bar-h-sm:54px;--gutter:16px;}
  .brand__glyph{width:28px;height:28px;}
  .brand__name{font-size:15px;}
  .brand__meta{font-size:9.5px;letter-spacing:.1em;}
  .nav-toggle__label{display:none;}
  .footer__col{grid-column:span 12;}
  .footer__base{flex-direction:column;gap:6px;}
  .section-head{gap:8px 14px;}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html[data-motion="on"] [data-reveal]{opacity:1;transform:none;}
  .card:hover{transform:none;}
  .is-flash{animation:none;box-shadow:inset 0 0 0 2px var(--mint-400);}
}