/* ============ 1. Tokens ============ */
:root{
  --c-bg:#0B1512;
  --c-bg-2:#10201C;
  --c-panel:#16262A;
  --c-ink:#F2F5F2;
  --c-ink-2:#D7E3DC;
  --c-muted:#9AA7A0;
  --c-cyan:#7FE7D4;
  --c-amber:#FFB454;
  --c-violet:#A78BFA;
  --c-line:#2E4740;
  --c-line-soft:rgba(46,71,64,.55);
  --r-sm:12px;
  --r-md:18px;
  --r-lg:28px;
  --r-pill:999px;
  --w-max:1180px;
  --pad:clamp(20px,5vw,48px);
  --gap:clamp(16px,3vw,32px);
  --font-display:"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --font-num:ui-monospace,"SF Mono","JetBrains Mono","Roboto Mono",Menlo,Consolas,"Courier New",monospace;
}

/* ============ 2. Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--c-bg);
  background-image:
    linear-gradient(to right,rgba(46,71,64,.22) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(46,71,64,.13) 1px,transparent 1px);
  background-size:96px 96px;
  background-position:center top;
  background-attachment:fixed;
  color:var(--c-ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{display:block;max-width:100%}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.15;
  color:var(--c-ink);
}
p{margin:0}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px;border-radius:6px}
::selection{background:var(--c-cyan);color:#06110E}

/* ============ 3. Utilities ============ */
.container{
  width:min(calc(100% - var(--pad) * 2),var(--w-max));
  margin-inline:auto;
}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.num{
  font-family:var(--font-num);
  font-weight:700;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}
.label{
  font-size:12.5px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--c-muted);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  font-weight:500;
  letter-spacing:.18em;
  color:var(--c-cyan);
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:18px;height:1px;
  background:var(--c-cyan);
}
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;
  border-radius:var(--r-pill);
  border:1px solid var(--c-line);
  background:var(--c-bg-2);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--c-ink-2);
}
.tag{
  display:inline-flex;align-items:center;
  padding:3px 10px;
  border-radius:var(--r-pill);
  background:rgba(167,139,250,.14);
  border:1px solid rgba(167,139,250,.4);
  color:var(--c-violet);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.06em;
}

/* ============ 4. Skip link ============ */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  transform:translateY(-220%);
  padding:10px 20px;
  border-radius:var(--r-pill);
  background:var(--c-cyan);
  color:#06110E;
  font-size:14px;
  font-weight:700;
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ============ 5. Scroll progress ============ */
.scroll-progress{
  position:fixed;
  inset:0 0 auto 0;
  height:2px;
  z-index:190;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-amber));
  pointer-events:none;
}

/* ============ 6. Header : topline ============ */
.site-header{position:relative}
.topline{
  position:sticky;
  top:0;
  z-index:120;
  height:48px;
  display:flex;
  align-items:center;
  background:var(--c-bg-2);
  border-bottom:1px solid var(--c-line);
}
.topline__inner{
  width:min(calc(100% - var(--pad) * 2),var(--w-max));
  margin-inline:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-size:12.5px;
  letter-spacing:.05em;
  color:var(--c-muted);
}
.topline__link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 2px;
  color:var(--c-ink-2);
  transition:color .18s ease;
}
.topline__link:hover{color:var(--c-cyan)}
.topline__dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--c-cyan);
  box-shadow:0 0 0 3px rgba(127,231,212,.16);
}

/* ============ 7. Header : masthead ============ */
.masthead{
  background:var(--c-bg);
  border-bottom:1px solid var(--c-line);
  padding-block:clamp(18px,3.4vw,32px);
}
.masthead__inner{
  width:min(calc(100% - var(--pad) * 2),var(--w-max));
  margin-inline:auto;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:12px;
}
.masthead__brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:4px;
  text-align:center;
  padding-inline:8px;
}
.masthead__brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(28px,5.4vw,44px);
  letter-spacing:-.02em;
  line-height:1;
  color:var(--c-ink);
  transition:color .2s ease;
}
.masthead__brand:hover .masthead__brand-name{color:var(--c-cyan)}
.masthead__brand-tag{
  font-size:10.5px;
  font-weight:500;
  letter-spacing:.3em;
  color:var(--c-muted);
  text-transform:uppercase;
  white-space:nowrap;
}
.masthead__meta,
.masthead__save{
  display:inline-flex;
  align-items:center;
  gap:8px;
  width:max-content;
  padding:8px 14px;
  border-radius:var(--r-pill);
  border:1px solid var(--c-line);
  background:var(--c-bg-2);
  font-size:12.5px;
  color:var(--c-ink-2);
  transition:border-color .2s ease,color .2s ease;
}
.masthead__meta{justify-self:start}
.masthead__save{justify-self:end}
.masthead__meta:hover,
.masthead__save:hover{border-color:var(--c-cyan);color:var(--c-cyan)}
.masthead__dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--c-cyan);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(127,231,212,.35)}
  50%{opacity:.6;box-shadow:0 0 0 5px rgba(127,231,212,0)}
}
.masthead__meta-k,
.masthead__save-k{
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--c-muted);
}
.masthead__meta-v,
.masthead__save-v{
  font-size:15px;
  color:var(--c-amber);
}

/* ============ 8. Header : nav ============ */
.nav{
  background:var(--c-bg);
  border-bottom:1px solid var(--c-line);
}
.nav__inner{
  width:min(calc(100% - var(--pad) * 2),var(--w-max));
  margin-inline:auto;
  display:flex;
  align-items:center;
  justify-content:center;
}
.nav__list{
  display:flex;
  align-items:center;
  gap:clamp(2px,1.6vw,18px);
  flex-wrap:wrap;
  justify-content:center;
}
.nav__link{
  position:relative;
  display:block;
  padding:17px 12px;
  font-size:14px;
  letter-spacing:.05em;
  color:var(--c-ink-2);
  transition:color .2s ease;
}
.nav__link::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:10px;
  height:1px;
  background:var(--c-cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s ease;
}
.nav__link:hover{color:var(--c-cyan)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--c-cyan)}
.nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-amber)}
.nav__toggle{
  display:none;
  align-items:center;
  gap:10px;
  width:100%;
  padding:14px var(--pad);
  font-size:12.5px;
  letter-spacing:.2em;
  color:var(--c-ink-2);
  border-bottom:1px solid var(--c-line-soft);
  transition:color .2s ease;
}
.nav__toggle:hover{color:var(--c-cyan)}
.nav__toggle-bars{
  position:relative;
  display:inline-block;
  width:18px;height:2px;
  border-radius:2px;
  background:var(--c-cyan);
}
.nav__toggle-bars::before,
.nav__toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;height:2px;
  border-radius:2px;
  background:var(--c-cyan);
  transition:transform .22s ease;
}
.nav__toggle-bars::before{top:-6px}
.nav__toggle-bars::after{top:6px}
.nav[data-open] .nav__toggle-bars{background:transparent}
.nav[data-open] .nav__toggle-bars::before{transform:translateY(6px) rotate(45deg)}
.nav[data-open] .nav__toggle-bars::after{transform:translateY(-6px) rotate(-45deg)}

/* ============ 9. Footer ============ */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  border-top:1px solid var(--c-line);
  background:linear-gradient(180deg,rgba(16,32,28,.7),rgba(11,21,18,.2));
}
.footer__inner{
  width:min(calc(100% - var(--pad) * 2),var(--w-max));
  margin-inline:auto;
  padding-top:clamp(32px,5vw,52px);
}
.footer__grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:var(--gap);
  padding-bottom:clamp(28px,4vw,44px);
}
.footer__col{min-width:0}
.footer__title{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
  font-family:var(--font-body);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--c-muted);
}
.footer__title::before{
  content:"";
  width:14px;height:1px;
  background:var(--c-cyan);
}
.footer__list{display:flex;flex-direction:column;gap:2px}
.footer__link{
  display:inline-block;
  padding-block:5px;
  font-size:14px;
  color:var(--c-ink-2);
  transition:color .18s ease,transform .18s ease;
}
.footer__link:hover{color:var(--c-cyan);transform:translateX(3px)}
.footer__label{
  display:block;
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--c-muted);
  margin-top:10px;
}
.footer__label:first-child{margin-top:0}
.footer__text{
  display:block;
  font-size:14px;
  color:var(--c-ink-2);
  overflow-wrap:anywhere;
}
.footer__text--mono{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  letter-spacing:.01em;
  color:var(--c-ink);
}
.footer__note{
  margin-top:14px;
  max-width:34ch;
  font-size:12.5px;
  line-height:1.7;
  color:var(--c-muted);
}
.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding-block:18px 22px;
  border-top:1px solid var(--c-line);
  font-size:12px;
  color:var(--c-muted);
}
.footer__brand{
  letter-spacing:.12em;
  color:var(--c-ink-2);
  font-weight:600;
}
.footer__legal{letter-spacing:.04em}

/* ============ 10. Buttons ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 24px;
  border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  cursor:pointer;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--c-cyan);color:#06110E}
.btn--primary:hover{background:#9BF2E2}
.btn--amber{background:var(--c-amber);color:#1A1206}
.btn--amber:hover{background:#FFC87C}
.btn--ghost{background:transparent;border-color:var(--c-line);color:var(--c-ink-2)}
.btn--ghost:hover{border-color:var(--c-cyan);color:var(--c-cyan)}
.btn--sm{padding:8px 16px;font-size:13px}

/* ============ 11. Surfaces ============ */
.panel{
  position:relative;
  overflow:hidden;
  padding:clamp(18px,3vw,28px);
  border:1px solid var(--c-line);
  border-radius:var(--r-lg);
  background:var(--c-panel);
}
.panel::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--c-cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s ease;
}
.panel:hover::after{transform:scaleX(1)}
.card{
  padding:clamp(16px,2.4vw,24px);
  border:1px solid var(--c-line);
  border-radius:var(--r-md);
  background:var(--c-bg-2);
}

/* ============ 12. Sections ============ */
.section{padding-block:clamp(36px,6vw,72px)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px;
  margin-bottom:clamp(20px,3vw,32px);
}
.section-title{
  font-size:clamp(22px,3.6vw,32px);
  line-height:1.15;
}

/* ============ 13. Breadcrumb ============ */
.breadcrumb{padding-block:16px}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:12.5px;
  color:var(--c-muted);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:var(--c-line);
}
.breadcrumb__link{color:var(--c-ink-2);transition:color .18s ease}
.breadcrumb__link:hover{color:var(--c-cyan)}

/* ============ 14. Grid ============ */
.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ============ 15. Prose ============ */
.prose{max-width:68ch;color:var(--c-ink-2)}
.prose > * + *{margin-top:1.2em}
.prose h2,
.prose h3{color:var(--c-ink);margin-top:1.8em}
.prose a{
  color:var(--c-cyan);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}

/* ============ 16. Image frame ============ */
.img-frame{
  position:relative;
  display:grid;
  place-items:center;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--c-line);
  border-radius:var(--r-lg);
  background:
    radial-gradient(130% 110% at 18% 0%,rgba(127,231,212,.16),transparent 62%),
    radial-gradient(90% 90% at 100% 100%,rgba(255,180,84,.1),transparent 60%),
    linear-gradient(160deg,#16262A,#0B1512 72%);
}
.img-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(46,71,64,.5) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(46,71,64,.5) 1px,transparent 1px);
  background-size:44px 44px;
  opacity:.5;
}
.img-frame img{
  width:100%;height:100%;
  object-fit:cover;
  position:relative;
  z-index:1;
}
.img-frame--wide{aspect-ratio:21 / 9}
.img-frame--tall{aspect-ratio:3 / 4}
.img-frame--square{aspect-ratio:1 / 1}
.img-frame__caption{
  position:absolute;
  left:16px;right:16px;bottom:14px;
  z-index:2;
  font-size:12px;
  line-height:1.5;
  letter-spacing:.02em;
  color:var(--c-ink-2);
  text-shadow:0 1px 8px rgba(0,0,0,.6);
}

/* ============ 17. Tabs ============ */
.tabs{display:block}
.tabs__list{
  display:inline-flex;
  flex-wrap:wrap;
  gap:6px;
  max-width:100%;
  padding:6px;
  border:1px solid var(--c-line);
  border-radius:var(--r-pill);
  background:var(--c-bg-2);
}
.tabs__tab{
  padding:9px 18px;
  border-radius:var(--r-pill);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.03em;
  color:var(--c-ink-2);
  transition:background .2s ease,color .2s ease;
}
.tabs__tab:hover{color:var(--c-cyan)}
.tabs__tab[aria-selected="true"]{
  background:var(--c-violet);
  color:#0B1020;
}
.tabs__panel{padding-top:clamp(16px,2.6vw,26px)}
.tabs__panel[hidden]{display:none}

/* ============ 18. Reveal ============ */
[data-reveal="pending"]{opacity:0;transform:translateY(16px)}
[data-reveal="shown"]{
  opacity:1;
  transform:translateY(0);
  transition:opacity .5s ease-out,transform .6s cubic-bezier(.2,.7,.3,1);
}

/* ============ 19. Responsive ============ */
@media (max-width:1023px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__col:last-child{grid-column:1 / -1}
}
@media (max-width:860px){
  .nav__inner{
    width:100%;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
  }
  .nav__toggle{display:flex}
  .nav__list{
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
    padding-bottom:10px;
  }
  .nav[data-open] .nav__list{display:flex}
  .nav__item{border-top:1px solid var(--c-line-soft)}
  .nav__link{padding:15px var(--pad);font-size:15px}
  .nav__link::after{display:none}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  body{font-size:16.5px;background-attachment:scroll}
  .masthead__inner{grid-template-columns:auto 1fr auto;gap:8px}
  .masthead__meta,
  .masthead__save{padding:7px 11px;gap:6px}
  .masthead__meta-k,
  .masthead__save-k{font-size:10.5px;letter-spacing:.04em}
  .masthead__meta-v,
  .masthead__save-v{font-size:14px}
  .masthead__brand-tag{letter-spacing:.2em;font-size:9.5px}
  .footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer__col:last-child{grid-column:auto}
  .footer__note{max-width:none}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:6px}
  .img-frame{border-radius:var(--r-md)}
}
@media (max-width:380px){
  .masthead__meta-k,
  .masthead__save-k{display:none}
}

/* ============ 20. Motion / print ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal="pending"]{opacity:1;transform:none}
  .scroll-progress{transition:none}
}
@media print{
  body{background:#fff;color:#000}
  .scroll-progress,.nav__toggle,.topline{display:none}
}