/* ========== 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,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
img,svg,video{max-width:100%;display:block}
table{border-collapse:collapse;width:100%}

/* ========== 2. TOKENS ========== */
:root{
  --ink:#061726;
  --cabin:#0C2436;
  --grid:#123A4F;
  --cyan:#4FE3D0;
  --teal:#2AA79B;
  --gold:#F2B85B;
  --gold-hi:#FFD9A0;
  --text:#E9F1F5;
  --muted:#9FB6C2;
  --violet:#8C6BFF;
  --coral:#E05A6A;
  --line:rgba(18,58,79,.85);
  --serif:"Source Han Serif SC","Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular","DejaVu Sans Mono",Consolas,monospace;
  --wrap:1360px;
  --gutter:clamp(24px,5vw,96px);
  --r-lg:28px;
  --r-md:18px;
  --r-sm:10px;
  --pill:999px;
  --head-h:84px;
}

/* ========== 3. BASE ========== */
body{
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background-color:var(--ink);
  background-image:
    radial-gradient(1200px 620px at 78% -12%,rgba(79,227,208,.10),transparent 62%),
    radial-gradient(900px 540px at 2% 6%,rgba(242,184,91,.07),transparent 64%),
    radial-gradient(760px 520px at 50% 108%,rgba(140,107,255,.07),transparent 60%),
    linear-gradient(180deg,#061726 0%,#082034 46%,#061726 100%);
  background-attachment:fixed;
  min-height:100vh;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(18,58,79,.30) 1px,transparent 1px),
    linear-gradient(90deg,rgba(18,58,79,.30) 1px,transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(120% 92% at 50% 0%,#000 18%,transparent 80%);
  mask-image:radial-gradient(120% 92% at 50% 0%,#000 18%,transparent 80%);
  opacity:.55;
}
h1,h2,h3,h4{font-weight:600;line-height:1.25;letter-spacing:0}
::selection{background:rgba(79,227,208,.28);color:#fff}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

/* ========== 4. UTILITIES ========== */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding-inline:var(--gutter);
  position:relative;
  z-index:1;
}
.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}
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:220;
  padding:10px 18px;border-radius:0 0 var(--r-sm) var(--r-sm);
  background:var(--gold);color:#1B1206;font-size:14px;font-weight:700;text-decoration:none;
  transition:top .2s ease;
}
.skip-link:focus{top:0}
.is-visible{opacity:1;visibility:visible}
.divider{height:1px;border:0;margin:clamp(32px,4vw,64px) 0;background:linear-gradient(90deg,var(--grid),rgba(18,58,79,.2))}

/* ========== 5. HEADER / COMMAND BAR ========== */
.cmdbar{
  position:sticky;top:0;z-index:120;
  background:rgba(6,23,38,.9);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
  border-bottom:1px solid var(--grid);
}
.cmdbar__inner{
  position:relative;
  display:grid;
  grid-template-columns:minmax(190px,auto) minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(14px,2.2vw,40px);
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:14px var(--gutter);
  transition:padding .28s cubic-bezier(.2,.8,.2,1);
}
.cmdbar[data-condensed="true"] .cmdbar__inner{padding-top:8px;padding-bottom:8px}
.cmdbar[data-condensed="true"] .brand__sub{opacity:0;height:0;overflow:hidden}
.cmdbar__scan{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  display:block;overflow:hidden;pointer-events:none;background:rgba(18,58,79,.55);
}
.cmdbar__scan i{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--teal),var(--cyan) 55%,var(--gold));
  transition:transform .12s linear;
}

.brand{display:inline-flex;align-items:center;gap:12px;min-width:0;text-decoration:none}
.brand__mark{position:relative;flex:none;width:30px;height:30px}
.brand__mark i{position:absolute;border-radius:50%}
.brand__mark i:nth-child(1){inset:0;border:1.5px solid var(--cyan);opacity:.55}
.brand__mark i:nth-child(2){inset:6px;border:1.5px solid var(--gold);opacity:.85}
.brand__mark i:nth-child(3){inset:12px;border:0;background:var(--gold-hi);opacity:.95}
.brand__text{display:flex;flex-direction:column;line-height:1.16;min-width:0}
.brand__name{
  font-family:var(--serif);font-weight:700;font-size:19px;letter-spacing:.02em;
  color:var(--text);white-space:nowrap;transition:color .2s ease;
}
.brand:hover .brand__name{color:var(--cyan)}
.brand__sub{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--muted);white-space:nowrap;transition:opacity .2s ease}

.nav{min-width:0}
.nav__list{display:flex;align-items:center;justify-content:center;gap:2px;flex-wrap:wrap}
.nav__link{
  display:inline-flex;align-items:baseline;gap:7px;
  padding:8px 12px;border-radius:var(--pill);
  border:1px solid transparent;
  color:var(--muted);font-size:14px;font-weight:600;letter-spacing:.01em;
  text-decoration:none;white-space:nowrap;
  transition:color .2s ease,background .2s ease,border-color .2s ease;
}
.nav__link:hover{color:var(--text);background:rgba(79,227,208,.09);border-color:rgba(79,227,208,.26)}
.nav__link[aria-current="page"]{color:#04141F;background:var(--cyan);border-color:var(--cyan)}
.nav__link[aria-current="page"] .nav__idx{color:rgba(4,20,31,.6)}
.nav__idx{font-family:var(--mono);font-size:10px;letter-spacing:.06em;color:var(--cyan)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 15px;border-radius:var(--pill);
  background:rgba(18,58,79,.55);border:1px solid var(--grid);
  color:var(--text);font-size:13px;font-weight:600;cursor:pointer;
  transition:border-color .2s ease,background .2s ease;
}
.nav-toggle:hover{border-color:rgba(79,227,208,.45)}
.nav-toggle__bars{display:grid;gap:4px;width:18px;flex:none}
.nav-toggle__bars i{display:block;height:2px;border-radius:2px;background:var(--cyan);transition:transform .22s ease,opacity .22s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

.anchor{
  display:flex;flex-direction:column;align-items:flex-end;gap:6px;
  min-width:222px;padding-left:clamp(12px,1.6vw,24px);
  border-left:1px solid var(--grid);
}
.anchor__row{display:flex;align-items:baseline;gap:9px}
.anchor__key{font-size:10.5px;letter-spacing:.16em;color:var(--muted);white-space:nowrap}
.anchor__time{font-family:var(--mono);font-size:16px;letter-spacing:-.02em;color:var(--gold)}
.anchor__meter{display:flex;align-items:center;gap:9px;width:100%;justify-content:flex-end}
.anchor__num{font-family:var(--mono);font-size:13px;letter-spacing:-.02em;color:var(--cyan);font-variant-numeric:tabular-nums}
.meter{
  position:relative;flex:1 1 auto;max-width:118px;height:6px;
  border-radius:var(--pill);border:1px solid var(--grid);
  background:rgba(18,58,79,.85);overflow:hidden;
}
.meter__fill{
  display:block;height:100%;width:68%;border-radius:var(--pill);
  background:linear-gradient(90deg,var(--teal),var(--cyan));
  transition:width .6s cubic-bezier(.2,.8,.2,1);
}

/* ========== 6. BUTTONS ========== */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 24px;border-radius:var(--pill);
  border:1px solid transparent;background:transparent;
  font-size:14.5px;font-weight:600;letter-spacing:.01em;
  text-decoration:none;cursor:pointer;
  transition:transform .18s ease,background .2s ease,color .2s ease,border-color .2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--gold{background:var(--gold);color:#1E1207;box-shadow:0 12px 28px -16px rgba(242,184,91,.85)}
.btn--gold:hover{background:var(--gold-hi)}
.btn--cyan{background:rgba(79,227,208,.12);border-color:rgba(79,227,208,.5);color:var(--cyan)}
.btn--cyan:hover{background:rgba(79,227,208,.2)}
.btn--ghost{border-color:var(--grid);color:var(--muted)}
.btn--ghost:hover{color:var(--text);border-color:rgba(79,227,208,.45)}

/* ========== 7. BREADCRUMB ========== */
.crumb{margin:clamp(22px,3vw,38px) 0}
.crumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12.5px;color:var(--muted)}
.crumb__item{display:inline-flex;align-items:center;gap:8px}
.crumb__link{color:var(--muted);text-decoration:none;transition:color .2s ease}
.crumb__link:hover{color:var(--cyan)}
.crumb__sep{color:rgba(159,182,194,.42)}
.crumb__current{color:var(--cyan);font-weight:600}

/* ========== 8. TEXT BLOCKS ========== */
.eyebrow{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.24em;
  color:var(--cyan);margin-bottom:12px;
}
.prose{max-width:74ch}
.prose h2{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(24px,2.6vw,32px);line-height:1.3;letter-spacing:-.01em;
  margin:clamp(34px,4vw,54px) 0 14px;
}
.prose h3{font-size:20px;font-weight:600;margin:28px 0 10px}
.prose p{margin:0 0 16px}
.prose ul{margin:0 0 18px}
.prose li{position:relative;padding-left:20px;margin-bottom:8px;color:var(--text)}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:10px;height:2px;border-radius:2px;background:var(--cyan)}
.prose a{color:var(--cyan);text-decoration-color:rgba(79,227,208,.4);text-underline-offset:3px}
.prose a:hover{text-decoration-color:var(--cyan)}
.prose strong{color:var(--gold)}

.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:12px 24px;margin-bottom:clamp(20px,2.4vw,32px);
}
.section-head__title{font-family:var(--serif);font-weight:700;font-size:clamp(26px,3vw,40px);letter-spacing:-.01em}
.section-head__more{font-size:13px;font-weight:600;color:var(--cyan);text-decoration:none}
.section-head__more:hover{color:var(--gold)}

/* ========== 9. GRID / PANEL / TAG / NUMBER ========== */
.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

.panel{
  border:1px solid var(--grid);border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(12,36,54,.9),rgba(12,36,54,.5));
  padding:clamp(20px,2.4vw,32px);
}
.panel__head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px 20px;margin-bottom:16px}
.panel__title{font-size:17px;font-weight:600}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--pill);
  border:1px solid currentColor;background:rgba(255,255,255,.02);
  font-size:12px;font-weight:600;white-space:nowrap;
}
.tag--gold{color:var(--gold)}
.tag--cyan{color:var(--cyan)}
.tag--violet{color:var(--violet)}
.tag--coral{color:var(--coral)}

.num{font-family:var(--mono);letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--gold)}
.num--lg{display:block;font-size:clamp(32px,4.4vw,60px);line-height:1;font-weight:700}
.num--xl{display:block;font-size:clamp(56px,9vw,132px);line-height:.92;font-weight:700}
.num--cyan{color:var(--cyan)}

/* ========== 10. TABS (DEVICE SWITCH) ========== */
.tabs{
  display:flex;gap:6px;width:max-content;max-width:100%;
  padding:6px;border:1px solid var(--grid);border-radius:var(--pill);
  background:rgba(12,36,54,.72);overflow-x:auto;
}
.tab{
  appearance:none;border:0;background:transparent;cursor:pointer;
  padding:9px 18px;border-radius:var(--pill);white-space:nowrap;
  color:var(--muted);font-size:13.5px;font-weight:600;
  transition:color .2s ease,background .2s ease;
}
.tab:hover{color:var(--text)}
.tab[data-active="true"]{background:rgba(79,227,208,.16);color:var(--cyan)}
.tabs__panel{margin-top:20px}
.tabs__panel[hidden]{display:none}
@keyframes panelIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:no-preference){
  .tabs__panel:not([hidden]){animation:panelIn .32s cubic-bezier(.2,.8,.2,1) both}
}

/* ========== 11. SECTION RAIL ========== */
.rail{position:sticky;top:calc(var(--head-h) + 22px);align-self:start}
.rail__title{font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--muted);margin-bottom:14px}
.rail__list{display:flex;flex-direction:column;gap:2px;border-left:1px solid var(--grid)}
.rail__link{
  display:block;margin-left:-1px;padding:8px 16px;
  border-left:2px solid transparent;
  border-radius:0 var(--pill) var(--pill) 0;
  color:var(--muted);font-size:13.5px;text-decoration:none;
  transition:color .2s ease,background .2s ease,border-color .2s ease;
}
.rail__link:hover{color:var(--text);background:rgba(79,227,208,.06)}
.rail__link[aria-current="true"]{color:#04141F;background:var(--cyan);border-left-color:var(--gold)}

/* ========== 12. FIGURE ========== */
.figure{margin:0}
.figure__frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;border-radius:var(--r-lg);border:1px solid var(--grid);
  background:
    radial-gradient(120% 120% at 18% 0%,rgba(79,227,208,.16),transparent 56%),
    radial-gradient(90% 90% at 92% 100%,rgba(242,184,91,.14),transparent 60%),
    linear-gradient(160deg,#0C2436,#061726);
}
.figure--square .figure__frame{aspect-ratio:1/1}
.figure--tall .figure__frame{aspect-ratio:3/4}
.figure__img{width:100%;height:100%;object-fit:cover}
.figure__caption{margin-top:10px;font-size:12.5px;color:var(--muted)}

/* ========== 13. FOOTER ========== */
.foot{
  position:relative;z-index:1;
  margin-top:clamp(72px,10vw,140px);
  border-top:1px solid var(--grid);
  background:linear-gradient(180deg,rgba(6,23,38,0) 0%,#0A2033 34%,#08192A 100%);
}
.foot::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(79,227,208,.5),rgba(242,184,91,.45),transparent);
}
.foot__inner{
  max-width:var(--wrap);margin:0 auto;
  padding:clamp(44px,6vw,84px) var(--gutter) 28px;
}
.foot__head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:12px 26px;
  padding-bottom:clamp(22px,3vw,38px);
  border-bottom:1px solid var(--grid);
  margin-bottom:clamp(26px,3.4vw,48px);
}
.foot__brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none}
.foot__brandname{font-family:var(--serif);font-weight:700;font-size:22px;letter-spacing:.02em;color:var(--text)}
.foot__brand:hover .foot__brandname{color:var(--cyan)}
.foot__tagline{font-size:13.5px;color:var(--muted);max-width:52ch}

.foot__grid{
  display:grid;
  grid-template-columns:1.05fr .85fr 1.35fr 1.05fr;
  gap:clamp(24px,3vw,48px);
}
.foot__title{
  font-family:var(--mono);font-size:11.5px;font-weight:600;letter-spacing:.18em;
  color:var(--cyan);margin-bottom:14px;
}
.foot__list li + li{margin-top:7px}
.foot__list--contact{word-break:break-word}
.foot__link{
  display:inline-block;padding:2px 0;font-size:14px;color:var(--text);
  text-decoration:none;border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.foot__link:hover{color:var(--cyan);border-bottom-color:rgba(79,227,208,.5)}
.foot__text{display:block;font-size:13.5px;line-height:1.7;color:var(--muted)}
.foot__note{
  margin-top:14px;padding-left:12px;
  border-left:2px solid var(--grid);
  font-size:12.5px;line-height:1.7;color:var(--muted);
}
.foot__ver{font-family:var(--mono);color:var(--violet);font-weight:600;letter-spacing:0}
.foot__time{font-family:var(--mono);color:var(--gold);letter-spacing:-.02em}
.foot__base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 24px;margin-top:clamp(30px,4vw,54px);padding-top:20px;
  border-top:1px solid var(--grid);
}
.foot__copy{font-size:12.5px;color:var(--muted)}
.foot__copy--meta{font-family:var(--mono);letter-spacing:.01em;color:rgba(159,182,194,.7)}

/* ========== 14. BACK TO TOP ========== */
.totop{
  position:fixed;right:clamp(16px,3vw,40px);bottom:clamp(16px,3vw,36px);z-index:140;
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;border-radius:var(--pill);
  border:1px solid rgba(79,227,208,.4);background:rgba(8,25,42,.94);
  color:var(--cyan);font-size:13px;font-weight:600;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .26s ease,transform .26s ease,visibility .26s ease,border-color .2s ease;
}
.totop:hover{border-color:var(--gold);color:var(--gold-hi)}
.totop__label{white-space:nowrap}

/* ========== 15. RESPONSIVE ========== */
@media (max-width:1240px){
  .nav__link{padding:8px 9px;font-size:13.5px}
  .anchor{min-width:190px}
}
@media (max-width:1080px){
  .nav__idx{display:none}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  :root{--head-h:112px}
  .cmdbar__inner{
    display:flex;flex-wrap:wrap;align-items:center;
    gap:10px 14px;padding:10px var(--gutter) 12px;
  }
  .cmdbar[data-condensed="true"] .cmdbar__inner{padding-top:8px;padding-bottom:10px}
  .brand{flex:1 1 auto}
  .nav-toggle{display:inline-flex;order:2}
  .anchor{
    order:3;flex:1 1 100%;flex-direction:row;align-items:center;justify-content:space-between;
    gap:14px;min-width:0;padding-left:0;padding-top:9px;border-left:0;
    border-top:1px solid var(--grid);
  }
  .anchor__meter{width:auto;flex:1 1 auto;justify-content:flex-start}
  .meter{max-width:none}
  .nav{
    position:absolute;left:0;right:0;top:100%;z-index:130;
    display:none;padding:12px var(--gutter) 20px;
    max-height:calc(100vh - 130px);overflow-y:auto;
    background:rgba(8,25,42,.985);
    -webkit-backdrop-filter:blur(16px);
    backdrop-filter:blur(16px);
    border-bottom:1px solid var(--grid);
  }
  .nav[data-open="true"]{display:block;animation:navDrop .22s cubic-bezier(.2,.8,.2,1) both}
  .nav__list{flex-direction:column;align-items:stretch;gap:4px}
  .nav__link{justify-content:flex-start;padding:12px 14px;font-size:15px;border-radius:var(--r-sm)}
  .nav__idx{display:inline}
  .grid--2{grid-template-columns:minmax(0,1fr)}
}
@keyframes navDrop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
@media (max-width:640px){
  .foot__grid{grid-template-columns:minmax(0,1fr)}
  .grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .brand__sub{display:none}
  .brand__name{font-size:17px}
  .nav-toggle__label{display:none}
  .foot__base{flex-direction:column;align-items:flex-start}
  .totop{padding:10px 14px}
  .totop__label{display:none}
}

/* ========== 16. MOTION PREFERENCES ========== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .nav[data-open="true"]{animation:none}
  .tabs__panel:not([hidden]){animation:none}
}