/* NearSpace Education — homepage */

:root{
  --ink:#101418;
  --ink-2:#3D454E;
  --paper:#FFFFFF;
  --panel:#ECEEF0;
  --rule:#D6DBE0;
  --rule-soft:#E6E9EC;
  --muted:#6E7681;
  --blue:#1C75BC;
  --blue-deep:#12507F;
  --maxw:1240px;
  --pad:32px;
  --ease:cubic-bezier(.22,.9,.28,1);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:"Public Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:17px;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}

h1,h2,h3{font-family:Archivo,sans-serif;margin:0;font-weight:600;letter-spacing:-.028em;line-height:1.06}
h1{font-size:clamp(2.5rem,5.4vw,4.15rem);letter-spacing:-.035em}
h2{font-size:clamp(1.85rem,3.4vw,2.7rem)}
h3{font-size:1.16rem;letter-spacing:-.015em}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
section{padding:clamp(64px,8vw,108px) 0}

/* ---- labels ---- */
.label{
  font-size:.7rem;font-weight:700;letter-spacing:.15em;text-transform:uppercase;
  color:var(--muted);display:flex;align-items:center;gap:12px;margin:0 0 26px;
}
.label::before{content:"";width:26px;height:1px;background:var(--blue);flex:none}
.label .n{color:var(--blue)}

.sect-h{max-width:22ch;margin-bottom:clamp(26px,3.4vw,40px)}
.lead{font-size:clamp(1.15rem,1.9vw,1.42rem);line-height:1.5;color:var(--ink);max-width:30ch;font-weight:400}
p{margin:0 0 18px}
.body p{color:var(--ink-2);max-width:60ch;font-size:1.03rem}
.body p:last-child{margin-bottom:0}

/* ---- links / buttons ---- */
.btn{
  display:inline-flex;align-items:center;gap:10px;min-height:48px;padding:0 26px;
  background:var(--blue);color:#fff;font-size:.97rem;font-weight:600;letter-spacing:.005em;
  border:1px solid var(--blue);cursor:pointer;
  transition:background .25s var(--ease),border-color .25s var(--ease);
}
.btn:hover{background:var(--blue-deep);border-color:var(--blue-deep)}
.btn-light{background:#fff;color:var(--ink);border-color:#fff}
.btn-light:hover{background:#E8EBEE;border-color:#E8EBEE}
.btn-line{background:transparent;color:var(--ink);border-color:var(--rule)}
.btn-line:hover{background:transparent;border-color:var(--ink)}
.on-dark .btn-line{color:#fff;border-color:rgba(255,255,255,.32)}
.on-dark .btn-line:hover{border-color:#fff;background:transparent}
.btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:34px}

.tlink{
  display:inline-flex;align-items:center;gap:9px;font-weight:600;font-size:.95rem;
  color:var(--blue);padding-bottom:3px;border-bottom:1px solid rgba(28,117,188,.3);
  transition:border-color .25s;
}
.tlink:hover{border-bottom-color:var(--blue)}

/* ---- header ---- */
.hdr{
  position:fixed;top:0;left:0;right:0;z-index:60;height:64px;display:flex;align-items:center;
  gap:30px;padding:0 var(--pad);
  background:rgba(255,255,255,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:border-color .3s,background .3s;
}
.hdr.lit{border-bottom-color:var(--rule-soft)}
.hdr-logo img{height:30px}
.hdr nav{display:flex;gap:2px;margin-left:auto}
.hdr nav a{
  padding:8px 13px;font-size:.9rem;font-weight:500;color:var(--ink-2);
  transition:color .2s;position:relative;
}
.hdr nav a::after{
  content:"";position:absolute;left:13px;right:13px;bottom:2px;height:1px;
  background:var(--blue);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .3s var(--ease);
}
.hdr nav a:hover{color:var(--ink)}
.hdr nav a:hover::after{transform:scaleX(1)}
.hdr .btn{min-height:38px;padding:0 18px;font-size:.88rem}
.burger{display:none;margin-left:auto;width:44px;height:44px;border:0;background:none;cursor:pointer;position:relative}
.burger i{position:absolute;left:12px;width:20px;height:1.5px;background:var(--ink);transition:transform .32s var(--ease)}
.burger i:first-child{top:19px}
.burger i:last-child{top:25px}
.burger.x i:first-child{transform:translateY(3px) rotate(45deg)}
.burger.x i:last-child{transform:translateY(-3px) rotate(-45deg)}

/* ---- hero ---- */
.hero{position:relative;min-height:92svh;display:flex;align-items:flex-end;padding:0;background:#05070A;overflow:hidden}
.hero-img{position:absolute;inset:0}
.hero-img img{width:100%;height:100%;object-fit:cover;object-position:center 40%;transform:scale(1.06);will-change:transform}
.hero-img::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(5,7,10,.55) 0%,rgba(5,7,10,.1) 30%,rgba(5,7,10,.86) 100%);
}
.hero-in{position:relative;z-index:2;width:100%;padding-bottom:clamp(50px,7vw,78px);color:#fff}
.hero h1{color:#fff;max-width:17ch}
.hero .lead{color:rgba(255,255,255,.78);max-width:36ch;margin-top:24px}
.hero .label{color:rgba(255,255,255,.62)}

/* ---- spec bar ---- */
.spec{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.spec-in{display:grid;grid-template-columns:repeat(4,1fr)}
.spec-in div{padding:22px 0;border-left:1px solid var(--rule-soft);padding-left:22px}
.spec-in div:first-child{border-left:0;padding-left:0}
.spec dt{font-size:.68rem;font-weight:700;letter-spacing:.15em;text-transform:uppercase;color:var(--muted);margin:0 0 6px}
.spec dd{margin:0;font-size:1rem;font-weight:500}

/* ---- intro ---- */
.two{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:clamp(36px,6vw,90px);align-items:start}

/* ---- figures ---- */
figure{margin:0}
.fig img{width:100%;object-fit:cover}
.fig figcaption{
  margin-top:14px;font-size:.83rem;color:var(--muted);
  padding-left:14px;border-left:2px solid var(--rule);
}

/* ---- numbers ---- */
.nums{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:clamp(30px,4vw,46px)}
.nums div{padding:26px 24px 26px 0;border-top:1px solid var(--ink)}
.nums b{
  display:block;font-family:Archivo,sans-serif;font-weight:600;
  font-size:clamp(2.1rem,4.4vw,3.1rem);letter-spacing:-.04em;line-height:1;
  font-variant-numeric:tabular-nums;
}
.nums span{display:block;margin-top:10px;font-size:.92rem;color:var(--muted)}

/* ---- program index (signature) ---- */
.index{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:clamp(30px,5vw,64px);align-items:start}
.idx-list{border-top:1px solid var(--ink)}

.idx{
  display:grid;grid-template-columns:52px 1fr;gap:20px;align-items:baseline;
  padding:30px 4px;border-bottom:1px solid var(--rule-soft);cursor:pointer;
  transition:background .3s var(--ease),padding-left .3s var(--ease);
}
.idx:hover,.idx.act{background:#F7F8F9;padding-left:14px}
.idx .no{font-size:.78rem;font-weight:700;letter-spacing:.1em;color:var(--muted);transition:color .3s}
.idx:hover .no,.idx.act .no{color:var(--blue)}
.idx h3{margin-bottom:0;font-size:1.28rem;max-width:30ch}
.idx p{margin:0;font-size:.97rem;color:var(--muted);max-width:46ch}
.idx .meta{font-size:.78rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
.idx-thumb{display:none;border-radius:2px;overflow:hidden;margin-top:14px}
.idx-thumb img{width:100%;aspect-ratio:16/10;object-fit:cover}

.idx-view{position:sticky;top:110px}
.idx-frame{position:relative;aspect-ratio:4/5;background:var(--panel);overflow:hidden}
.idx-frame img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0;transform:scale(1.03);
  transition:opacity .6s var(--ease),transform 1.1s var(--ease);
}
.idx-frame img.show{opacity:1;transform:scale(1)}
.idx-cap{margin-top:14px;font-size:.83rem;color:var(--muted);min-height:2.6em}

/* ---- dark band ---- */
.band{background:var(--ink);color:#fff}
.band h2,.band h3{color:#fff}
.band .body p{color:#AEB6BF}
.band .label{color:#7C8794}
.band .fig figcaption{color:#8A929C;border-left-color:rgba(255,255,255,.2)}

/* ---- video ---- */
.video{aspect-ratio:16/9;background:#000}
.video iframe{width:100%;height:100%;border:0;display:block}

/* ---- partners ---- */
.marks{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:34px}
.marks figure{
  background:#fff;border:1px solid var(--rule-soft);height:118px;
  display:flex;align-items:center;justify-content:center;padding:20px 22px;
  transition:border-color .3s var(--ease),transform .3s var(--ease);
}
.marks figure:hover{border-color:var(--rule);transform:translateY(-2px)}
.marks img{max-height:100%;max-width:100%;width:auto;object-fit:contain}
.marks-3{grid-template-columns:repeat(3,1fr);max-width:720px}
.marks-3 figure{height:150px;padding:26px 30px}

/* ---- closing ---- */
.close{border-top:1px solid var(--rule)}

/* ---- footer ---- */
.ftr{background:var(--panel);padding:clamp(50px,7vw,76px) 0 32px;font-size:.94rem}
.ftr-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px}
.ftr img{height:36px}
.ftr h4{font-size:.7rem;font-weight:700;letter-spacing:.15em;text-transform:uppercase;color:var(--muted);margin:0 0 15px}
.ftr ul{list-style:none;padding:0;margin:0}
.ftr li{margin-bottom:10px}
.ftr a{color:var(--ink-2)}
.ftr a:hover{color:var(--blue)}
.ftr-base{margin-top:44px;padding-top:22px;border-top:1px solid var(--rule);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:.85rem}

/* ---- reveal ---- */
[data-r]{opacity:0;transform:translateY(18px)}
[data-r].in{opacity:1;transform:none;transition:opacity .8s var(--ease),transform .8s var(--ease)}

/* ---- responsive ---- */
@media(max-width:1040px){
  .index{grid-template-columns:1fr}
  .idx-view{display:none}
  .idx-thumb{display:block}
  .marks{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:820px){
  :root{--pad:22px}
  .hdr nav{
    position:fixed;top:64px;left:0;right:0;flex-direction:column;gap:0;
    background:#fff;border-bottom:1px solid var(--rule);padding:10px var(--pad) 22px;
    opacity:0;transform:translateY(-8px);pointer-events:none;transition:.28s var(--ease);
  }
  .hdr nav.open{opacity:1;transform:none;pointer-events:auto}
  .hdr nav a{padding:14px 2px;font-size:1.02rem}
  .hdr>.btn{display:none}
  .burger{display:block}
  .spec-in{grid-template-columns:1fr 1fr}
  .spec-in div{border-left:0;padding-left:0;border-top:1px solid var(--rule-soft)}
  .spec-in div:nth-child(-n+2){border-top:0}
  .two{grid-template-columns:1fr;gap:28px}
  .nums{grid-template-columns:1fr 1fr}
  .idx{grid-template-columns:34px 1fr;gap:14px}
  .marks{grid-template-columns:repeat(2,1fr)}
  .ftr-grid{grid-template-columns:1fr;gap:32px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:.001ms!important;animation-duration:.001ms!important}
  [data-r]{opacity:1;transform:none}
  .hero-img img{transform:none}
}