/* ============ 1. Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,picture{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
hr{border:0}

/* ============ 2. Tokens ============ */
:root{
  --deep:#040C16;
  --deep-2:#0A1B2C;
  --panel:#102B41;
  --grid:#1E3F58;
  --cyan:#22F0D6;
  --cyan-deep:#0E8F86;
  --coral:#FF7A55;
  --sand:#E9C88A;
  --sky:#A8D8F0;
  --white:#F4F8FC;
  --muted:#8FA9BF;

  --font-display:"Archivo Black","Noto Sans SC","PingFang SC",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,monospace;

  --rail-w:68px;
  --rail-r-w:56px;
  --strip-h:64px;

  --ease:cubic-bezier(.22,1,.36,1);
  --maxw:1240px;
}

/* ============ 3. Base ============ */
html{background:var(--deep)}
body{
  min-height:100dvh;
  background-color:var(--deep);
  background-image:
    radial-gradient(120% 80% at 12% -10%,rgba(34,240,214,.10),transparent 55%),
    radial-gradient(90% 60% at 88% 4%,rgba(255,122,85,.07),transparent 60%),
    radial-gradient(100% 70% at 50% 100%,rgba(14,143,134,.10),transparent 62%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:300;
  line-height:1.75;
  padding-left:var(--rail-w);
  padding-right:var(--rail-r-w);
  padding-top:var(--strip-h);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:500;line-height:1.2;letter-spacing:-.01em}
h1,h2{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:.98}
strong{font-weight:500;color:var(--white)}
::selection{background:rgba(34,240,214,.28);color:var(--white)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}

/* ============ 4. Utilities ============ */
.shell{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(18px,4vw,56px)}
.section{padding-block:clamp(44px,7vw,96px);position:relative}
.stack{display:flex;flex-direction:column;gap:clamp(12px,1.6vw,20px)}
.grid{display:grid;gap:clamp(16px,2.4vw,24px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr))}
.rule{height:1px;width:100%;background:linear-gradient(90deg,var(--grid),rgba(30,63,88,.15));border:0}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;
  color:var(--sand);text-transform:uppercase;
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--cyan)}
.section-head{display:grid;gap:12px;max-width:min(100%,760px)}
.section-head__title{font-family:var(--font-display);font-size:clamp(1.9rem,4vw,3rem);line-height:1.02}
.section-head__note{color:var(--muted);font-size:14px;max-width:52ch}
.prose{max-width:64ch;font-size:17px;line-height:1.8;color:#DCE8F2}
.prose p + p{margin-top:1.2em}
.prose a{color:var(--sky);border-bottom:1px solid rgba(168,216,240,.35)}
.prose a:hover{border-color:var(--cyan);color:var(--cyan)}

/* ============ 5. Skip link ============ */
.skip-link{
  position:fixed;top:8px;left:calc(var(--rail-w) + 12px);z-index:200;
  padding:10px 18px;background:var(--cyan);color:#04191A;
  font-size:13px;font-weight:500;letter-spacing:.04em;
  border-radius:2px;transform:translateY(-180%);
  transition:transform .25s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);outline:2px solid var(--white);outline-offset:2px}

/* ============ 6. Buttons ============ */
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:10px 18px;border:1px solid transparent;border-radius:2px;
  font-size:14px;font-weight:400;letter-spacing:.04em;line-height:1.2;
  overflow:hidden;isolation:isolate;white-space:nowrap;
  transition:background-color .28s var(--ease),color .28s var(--ease),border-color .28s var(--ease),transform .28s var(--ease);
}
.btn::after{
  content:"";position:absolute;left:var(--rx,50%);top:var(--ry,50%);
  width:240px;height:240px;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,rgba(34,240,214,.45),rgba(34,240,214,0) 70%);
  transform:translate(-50%,-50%) scale(.2);opacity:0;z-index:-1;
}
.btn.is-rippling::after{animation:ripple .6s ease-out forwards}
@keyframes ripple{
  0%{opacity:.9;transform:translate(-50%,-50%) scale(.2)}
  100%{opacity:0;transform:translate(-50%,-50%) scale(1)}
}
.btn--primary{background:var(--cyan);color:#04191A;border-color:var(--cyan);font-weight:500}
.btn--primary:hover{background:#5CF6E3;border-color:#5CF6E3;transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--white);border-color:var(--grid)}
.btn--ghost:hover{border-color:var(--cyan-deep);color:var(--cyan);background:rgba(34,240,214,.06)}
.btn--top{
  margin-left:auto;padding:8px 14px;font-family:var(--font-mono);
  font-size:11px;letter-spacing:.18em;color:var(--sky);
  background:rgba(16,43,65,.55);border-color:var(--grid);
}
.btn--top:hover{border-color:var(--cyan);color:var(--cyan)}

/* ============ 7. Header strip ============ */
.site-header{position:static}
.header-strip{
  position:fixed;top:0;left:var(--rail-w);right:var(--rail-r-w);
  height:var(--strip-h);z-index:80;
  display:flex;align-items:center;gap:clamp(12px,2vw,26px);
  padding:0 clamp(16px,2.4vw,32px);
  background:rgba(10,27,44,.94);
  border-bottom:1px solid var(--grid);
  backdrop-filter:blur(6px);
  transition:background-color .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header[data-scrolled="true"] .header-strip{
  background:rgba(6,18,30,.98);
  box-shadow:0 1px 0 rgba(34,240,214,.22),0 14px 30px -26px rgba(0,0,0,.9);
}
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand__glyph{
  position:relative;width:13px;height:13px;flex:0 0 auto;
  border:1px solid var(--cyan);display:inline-block;
}
.brand__glyph::after{content:"";position:absolute;inset:3px;background:var(--coral)}
.brand__text{
  display:inline-flex;align-items:baseline;gap:.4em;
  font-family:var(--font-display);font-size:15px;font-weight:800;
  letter-spacing:.08em;color:var(--white);
}
.brand__sep{color:var(--coral);font-weight:400}
.brand__text .mono{font-size:10px;letter-spacing:.24em;color:var(--sky)}
.header-strip__edition{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 10px;border:1px solid var(--grid);border-radius:1px;
  font-size:10px;letter-spacing:.2em;color:var(--sand);white-space:nowrap;
}
.header-strip__edition::before{
  content:"";width:5px;height:5px;background:var(--cyan);
  box-shadow:0 0 8px rgba(34,240,214,.9);flex:0 0 auto;
}
.header-strip__note{
  font-size:12px;color:var(--muted);letter-spacing:.04em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:34ch;
}
.header-strip__actions{margin-left:auto;display:flex;align-items:center;gap:10px}

/* mobile toggle */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;border:1px solid var(--grid);border-radius:2px;
  font-size:11px;letter-spacing:.2em;color:var(--sky);
  background:rgba(16,43,65,.6);
  transition:color .25s,border-color .25s;
}
.nav-toggle:hover{color:var(--cyan);border-color:var(--cyan-deep)}
.nav-toggle__bars{position:relative;width:16px;height:10px;display:inline-block;flex:0 0 auto}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:1px;background:currentColor;
  transition:transform .3s var(--ease),top .3s var(--ease),opacity .3s var(--ease);
}
.nav-toggle__bars::before{top:2px}
.nav-toggle__bars::after{top:7px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

/* ============ 8. Left frame nav ============ */
.rail-nav{
  position:fixed;top:0;left:0;width:var(--rail-w);height:100dvh;z-index:60;
  display:flex;flex-direction:column;align-items:center;gap:16px;
  padding:20px 0 18px;
  background:linear-gradient(180deg,#0A1B2C 0%,#061220 55%,#0A1B2C 100%);
  border-right:1px solid var(--grid);
  overflow-y:auto;overscroll-behavior:contain;scrollbar-width:none;
}
.rail-nav::-webkit-scrollbar{display:none}
.rail-nav__title{
  writing-mode:vertical-rl;text-orientation:upright;
  font-size:9px;line-height:1;letter-spacing:.34em;color:var(--sand);opacity:.8;
}
.rail-nav__list{display:flex;flex-direction:column;align-items:center;gap:2px;margin:auto 0;width:100%}
.rail-nav__item{display:block;width:100%;text-align:center}
.rail-nav__link{
  position:relative;display:inline-block;
  writing-mode:vertical-rl;text-orientation:upright;
  font-size:13px;letter-spacing:.16em;line-height:1;color:var(--muted);
  padding:14px 7px;border-radius:1px;
  transition:color .3s var(--ease),background-color .3s var(--ease);
}
.rail-nav__link::before{
  content:attr(data-num);
  font-family:var(--font-mono);font-size:9px;letter-spacing:.16em;
  color:var(--sand);opacity:.85;margin-inline-end:.75em;
}
.rail-nav__label{display:inline-block}
.rail-nav__link:hover{color:var(--white);background:rgba(34,240,214,.08)}
.rail-nav__link[aria-current="page"]{color:var(--cyan)}
.rail-nav__link[aria-current="page"]::before{color:var(--coral);opacity:1}
.rail-nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:-9px;top:8px;bottom:8px;width:2px;
  background:var(--cyan);box-shadow:0 0 10px rgba(34,240,214,.75);
}
.rail-nav__foot{
  writing-mode:vertical-rl;text-orientation:upright;
  font-size:9px;line-height:1;letter-spacing:.24em;color:var(--muted);opacity:.75;
}

/* ============ 9. Right depth rail ============ */
.depth-rail{
  position:fixed;top:0;right:0;width:var(--rail-r-w);height:100dvh;z-index:55;
  display:flex;flex-direction:column;align-items:center;gap:14px;
  padding:18px 0;
  background:linear-gradient(180deg,#0A1B2C,#050F1A);
  border-left:1px solid var(--grid);
}
.depth-rail__label{
  writing-mode:vertical-rl;text-orientation:upright;
  font-size:9px;line-height:1;letter-spacing:.34em;color:var(--muted);
}
.depth-rail__track{position:relative;flex:1 1 auto;width:2px;min-height:80px;background:var(--grid);overflow:hidden}
.depth-rail__fill{
  position:absolute;left:0;top:0;width:100%;height:0%;
  background:linear-gradient(180deg,var(--cyan),var(--cyan-deep));
  box-shadow:0 0 10px rgba(34,240,214,.6);
  transition:height .12s linear;
}
.depth-rail__pct{
  writing-mode:vertical-rl;text-orientation:upright;
  font-size:9px;line-height:1;letter-spacing:.18em;color:var(--sand);
}

/* ============ 10. Content primitives ============ */
#main-content{display:block}
#main-content:focus{outline:none}
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--muted);padding-block:20px;
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--grid)}
.breadcrumb a{color:var(--muted);transition:color .25s}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--sky)}

.card{
  position:relative;background:var(--panel);border:1px solid var(--grid);
  border-radius:2px;padding:clamp(18px,2.4vw,28px);
  transition:transform .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
@media (hover:hover){
  .card:hover{
    transform:translateY(-2px);border-color:var(--cyan-deep);
    box-shadow:0 18px 40px -28px rgba(34,240,214,.75);
  }
}
.panel{
  position:relative;border:1px solid var(--grid);border-radius:2px;
  padding:clamp(18px,2.4vw,32px);
  background:linear-gradient(158deg,rgba(16,43,65,.96),rgba(4,12,22,.96));
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--grid);border-radius:1px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;color:var(--sky);
}
.tag--cyan{color:var(--cyan);border-color:rgba(34,240,214,.4);background:rgba(34,240,214,.07)}
.tag--coral{color:var(--coral);border-color:rgba(255,122,85,.45);background:rgba(255,122,85,.07)}

/* image containers */
.media{
  position:relative;overflow:hidden;border:1px solid var(--grid);border-radius:2px;
  aspect-ratio:16 / 10;
  background-color:var(--panel);
  background-image:
    radial-gradient(120% 90% at 18% 0%,rgba(34,240,214,.18),transparent 58%),
    radial-gradient(100% 100% at 92% 100%,rgba(255,122,85,.13),transparent 62%),
    linear-gradient(158deg,#102B41 0%,#071523 55%,#040C16 100%);
}
.media img,.media picture > img{width:100%;height:100%;object-fit:cover;display:block}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(244,248,252,.06) 0 1px,transparent 1px 3px);
  opacity:.4;mix-blend-mode:overlay;
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--square{aspect-ratio:1 / 1}
.media__caption{
  margin-top:10px;font-family:var(--font-mono);font-size:12px;
  line-height:1.6;letter-spacing:.04em;color:var(--muted);
}

/* ============ 11. Footer ============ */
.site-footer{
  position:relative;margin-top:clamp(56px,8vw,120px);
  background:linear-gradient(180deg,#0A1B2C 0%,#040C16 100%);
  border-top:1px solid var(--grid);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan) 22%,var(--coral) 62%,transparent);
  opacity:.7;
}
.site-footer__inner{
  max-width:var(--maxw);margin-inline:auto;
  padding:clamp(40px,6vw,80px) clamp(18px,4vw,56px) 28px;
}
.footer-head{
  display:grid;grid-template-columns:minmax(240px,1fr) minmax(0,1.35fr);
  gap:clamp(28px,5vw,72px);align-items:start;
}
.brand--footer .brand__text{font-size:17px}
.footer-brand__tagline{
  margin-top:18px;font-family:var(--font-display);font-weight:800;
  font-size:clamp(1.7rem,4vw,2.6rem);line-height:1.04;letter-spacing:-.02em;
  color:var(--white);
}
.footer-brand__meta{margin-top:14px;font-size:10px;letter-spacing:.26em;color:var(--sand)}
.footer-cols{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;
  border-left:1px solid var(--grid);padding-left:clamp(20px,3vw,48px);
}
.footer-col__title{
  font-family:var(--font-mono);font-size:10px;font-weight:400;
  letter-spacing:.3em;color:var(--sand);margin-bottom:14px;
}
.footer-col ul{display:grid;gap:8px}
.footer-col a{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;color:var(--muted);padding-block:3px;
  transition:color .25s var(--ease);
}
.footer-col a::before{
  content:"";width:0;height:1px;background:var(--cyan);
  transition:width .25s var(--ease);flex:0 0 auto;
}
.footer-col a:hover{color:var(--white)}
.footer-col a:hover::before{width:14px}
.footer-contact{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;
  margin-top:clamp(32px,5vw,56px);padding-top:clamp(24px,3vw,32px);
  border-top:1px solid var(--grid);
}
.footer-contact__label{
  display:block;font-family:var(--font-mono);font-size:10px;
  letter-spacing:.28em;color:var(--sand);margin-bottom:6px;
}
.footer-contact__value{font-size:14px;line-height:1.65;color:var(--white);word-break:break-word}
.footer-contact__note{grid-column:1 / -1;font-size:12px;color:var(--muted)}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px 24px;
  margin-top:clamp(28px,4vw,44px);padding-top:20px;border-top:1px solid var(--grid);
}
.footer-base__legal{font-size:11px;letter-spacing:.1em;color:var(--muted)}
.footer-base__links{display:flex;flex-wrap:wrap;gap:16px;font-size:12px;color:var(--muted)}
.footer-base__links a{transition:color .25s}
.footer-base__links a:hover{color:var(--cyan)}
.footer-base__copy{font-size:11px;letter-spacing:.08em;color:var(--muted)}

/* ============ 12. Motion / reveal ============ */
.js [data-reveal]{
  opacity:0;transform:translateY(24px);
  transition:opacity .48s var(--ease),transform .48s var(--ease);
  transition-delay:calc(var(--reveal-i,0) * 60ms);
}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ============ 13. Responsive ============ */
@media (max-width:1240px){
  .header-strip__note{display:none}
}
@media (max-width:1080px){
  :root{--rail-r-w:0px}
  .depth-rail{display:none}
  body{padding-right:0}
  .header-strip{right:0}
}
@media (max-height:820px){
  .rail-nav__title{display:none}
  .rail-nav__link{padding:9px 7px;font-size:12px}
  .rail-nav__foot{font-size:8px}
}
@media (max-height:640px){
  .rail-nav__foot{display:none}
}

@media (max-width:900px){
  .footer-head{grid-template-columns:1fr}
  .footer-cols{
    border-left:0;padding-left:0;padding-top:24px;
    border-top:1px solid var(--grid);
  }
}

@media (max-width:860px){
  :root{--rail-w:0px;--strip-h:56px}
  body{padding-left:0;padding-right:0;padding-top:var(--strip-h);background-attachment:scroll}
  .header-strip{left:0;right:0;height:var(--strip-h);padding:0 14px;gap:10px;backdrop-filter:none}
  .header-strip__actions{margin-left:auto}
  .header-strip__actions .btn{padding:8px 12px;font-size:12px}
  .nav-toggle{display:inline-flex}
  .brand__text{font-size:14px}

  .rail-nav{
    position:fixed;inset:0;width:auto;height:100dvh;
    align-items:stretch;gap:0;padding:calc(var(--strip-h) + 28px) 22px 32px;
    background-color:var(--deep);border-right:0;
    background-image:
      linear-gradient(rgba(30,63,88,.32) 1px,transparent 1px),
      linear-gradient(90deg,rgba(30,63,88,.32) 1px,transparent 1px);
    background-size:100% 64px,64px 100%;
    transform:translateY(-100%);opacity:0;pointer-events:none;
    transition:transform .42s var(--ease),opacity .3s var(--ease);
    z-index:70;overflow-y:auto;
  }
  .rail-nav[data-open="true"]{transform:none;opacity:1;pointer-events:auto}
  .rail-nav__title{
    writing-mode:horizontal-tb;text-orientation:mixed;
    font-size:10px;letter-spacing:.3em;margin-bottom:18px;
  }
  .rail-nav__list{flex-direction:column;align-items:stretch;gap:0;margin:0 0 auto;width:100%}
  .rail-nav__item{text-align:left;width:100%}
  .rail-nav__link{
    display:flex;align-items:baseline;gap:14px;width:100%;
    writing-mode:horizontal-tb;text-orientation:mixed;
    padding:16px 4px;font-size:19px;letter-spacing:.06em;color:var(--white);
    border-bottom:1px solid var(--grid);
  }
  .rail-nav__link::before{margin-inline-end:0;font-size:11px;color:var(--sand)}
  .rail-nav__link[aria-current="page"]{color:var(--cyan)}
  .rail-nav__link[aria-current="page"]::after{
    display:none;
  }
  .rail-nav__link:hover{background:rgba(34,240,214,.06)}
  .rail-nav__foot{
    writing-mode:horizontal-tb;text-orientation:mixed;
    font-size:10px;letter-spacing:.24em;color:var(--muted);
  }
  .skip-link{left:12px}
  .footer-contact{grid-template-columns:1fr 1fr}
}

@media (max-width:640px){
  .header-strip__edition{display:none}
  .header-strip__actions .btn--ghost{display:none}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
  .footer-contact{grid-template-columns:1fr}
  .footer-base__copy{order:3}
  .btn--top{margin-left:0}
  .section{padding-block:clamp(32px,9vw,56px)}
}

@media (max-width:420px){
  .header-strip__actions .btn--primary{display:none}
  .footer-cols{grid-template-columns:1fr}
}

/* ============ 14. 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;
    transition-delay:0ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .btn::after{display:none}
  .rail-nav{transition:none}
  .depth-rail__fill{transition:none}
}