:root{
  --ink:#141422;
  --glass: rgba(18, 18, 28, .62);
  --stroke: rgba(255,255,255,.14);
  --shadow: rgba(0,0,0,.45);

  /* Retro grade colors */
  --k5:#ffe86b;
  --ms:#6ef2ff;
  --hs:#ff75d6;
  --beyond:#98ff88;

  --text: rgba(255,255,255,.95);
  --muted: rgba(255,255,255,.82);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }

body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: #0b0b12;
  overflow-x:hidden;
}

/* ---- Background: “edutainment portal” gradient + sparkles ---- */
.bg{
  position:fixed;
  inset:0;
  z-index:-2;
  background:
    radial-gradient(circle at 12% 18%, rgba(255,232,107,.35), transparent 42%),
    radial-gradient(circle at 82% 22%, rgba(255,117,214,.28), transparent 46%),
    radial-gradient(circle at 55% 90%, rgba(110,242,255,.26), transparent 52%),
    radial-gradient(circle at 8% 88%, rgba(152,255,136,.18), transparent 50%),
    linear-gradient(120deg, #4b1f7a 0%, #a02f54 38%, #ff7a18 100%);
  filter:saturate(1.05);
}

/* sparkles layer */
.sparkles{
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.45;
  background:
    radial-gradient(rgba(255,255,255,.85) 1px, transparent 1px) 0 0/90px 90px,
    radial-gradient(rgba(255,255,255,.55) 1px, transparent 1px) 45px 45px/140px 140px,
    radial-gradient(rgba(255,255,255,.35) 1px, transparent 1px) 20px 70px/200px 200px;
  mix-blend-mode: screen;
}

/* subtle vignette */
.vignette{
  position:fixed;
  inset:-20%;
  pointer-events:none;
  z-index:0;
  background: radial-gradient(circle at center, transparent 35%, rgba(0,0,0,.42) 78%);
}

/* ---- Layout ---- */
.wrap{
  min-height:100%;
  display:grid;
  place-items:center;
  padding: clamp(18px, 4vw, 48px);
}

.card{
  width:min(880px, 100%);
  padding: clamp(22px, 4.5vw, 52px);
  border-radius: 28px;
  background: var(--glass);
  border: 1px solid var(--stroke);
  box-shadow: 0 28px 80px var(--shadow), inset 0 1px 0 rgba(255,255,255,.10);
  backdrop-filter: blur(8px);
  text-align:center;
  position:relative;
  overflow:hidden;
}

/* a soft “retro glow stripe” */
.card::before{
  content:"";
  position:absolute;
  inset:-40%;
  background: conic-gradient(
    from 210deg,
    rgba(255,232,107,.18),
    rgba(110,242,255,.14),
    rgba(255,117,214,.16),
    rgba(152,255,136,.12),
    rgba(255,232,107,.18)
  );
  filter: blur(32px);
  opacity:.65;
  z-index:-1;
}

.brand{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:14px;
  margin-bottom: 10px;
}

.logo{
  width:54px; height:54px;
  display:grid; place-items:center;
  border-radius: 16px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.18);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.14);
}

.logo svg{ width:34px; height:34px; }

h1{
  margin: 10px 0 6px;
  font-weight: 900;
  letter-spacing: .02em;
  font-size: clamp(34px, 5.2vw, 56px);
}

.sub{
  margin: 0 auto 22px;
  max-width: 60ch;
  color: var(--muted);
  font-size: clamp(16px, 2.0vw, 20px);
  line-height:1.5;
}

.pill{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(0,0,0,.18);
  color: rgba(255,255,255,.92);
  letter-spacing: .18em;
  font-weight: 800;
  font-size: 12px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

/* ---- Grade “portal tabs” ---- */
.tabs{
  margin-top: 22px;
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap: 14px;
}

.tab{
  appearance:none;
  border: 2px solid rgba(0,0,0,.40);
  border-radius: 16px;
  padding: 12px 18px;
  font-weight: 900;
  letter-spacing: .02em;
  color: #1b1b26;
  box-shadow:
    0 10px 0 rgba(0,0,0,.22),
    inset 0 2px 0 rgba(255,255,255,.75);
  cursor: pointer;
  user-select:none;
  min-width: 120px;
  text-align:center;
  display:inline-block;
  text-decoration:none;
}

.tab small{
  display:block;
  font-weight:800;
  letter-spacing:.12em;
  opacity:.75;
  margin-top:4px;
  font-size:11px;
}

.k5{ background: var(--k5); }
.ms{ background: var(--ms); }
.hs{ background: var(--hs); }
.beyond{ background: var(--beyond); }

.footer{
  margin-top: 26px;
  color: rgba(255,255,255,.72);
  font-size: 13px;
}

.footer a{
  color: rgba(255,255,255,.88);
  text-decoration: none;
  border-bottom: 1px dotted rgba(255,255,255,.40);
}

/* Responsive tightening */
@media (max-width: 520px){
  .tab{ min-width: 46%; }
}