/* ============================================================
   Noqta STEM pages — /stem, /stem/g10|g11|g12, /stem/stem-seekers.
   One look for the three: the home page's palette (navy, sky, soft
   surfaces), Space Grotesk headings, and each section's own colour
   through --c. Motion lives in stem-ui.js and respects reduced motion.
   ============================================================ */

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #0D1E2D;
  --primary-light: #162840;
  --accent: #4BBDE8;
  --accent-dark: #2AA8D8;
  --accent-light: #E8F7FD;
  --surface: #F7F9FC;
  --border: #E4EBF2;
  --text-muted: #5B6B7C;
  --text-light: #8899AA;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(13, 30, 45, 0.06);
  --shadow-md: 0 4px 16px rgba(13, 30, 45, 0.08), 0 2px 8px rgba(13, 30, 45, 0.04);
  --shadow-lg: 0 18px 40px rgba(13, 30, 45, 0.12), 0 4px 12px rgba(13, 30, 45, 0.06);
  --c: #4BBDE8;
  --c-soft: color-mix(in srgb, var(--c) 10%, var(--nq-paper));
  --c-ink: color-mix(in srgb, var(--c) 72%, var(--nq-ink));
  --ease: cubic-bezier(.2, .7, .2, 1);
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'IBM Plex Sans Arabic', -apple-system, sans-serif;
  color: var(--nq-ink);
  background: var(--nq-page);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, .display { font-family: 'Space Grotesk', 'IBM Plex Sans Arabic', sans-serif; letter-spacing: -0.01em; }
a { color: inherit; }
button { font-family: inherit; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ── Buttons ── */
.btn {
  border: 1.5px solid transparent;
  cursor: pointer;
  font-weight: 700;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-size: 0.92rem;
  line-height: 1.2;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
  transition: transform .18s var(--ease), background .18s, border-color .18s, box-shadow .18s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-light); box-shadow: var(--shadow-md); }
.btn-accent { background: var(--accent); color: var(--nq-ink-fixed); }
.btn-accent:hover { background: var(--nq-sky-light); }
.btn-ghost { background: var(--nq-paper); color: var(--nq-ink); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--nq-ink); }
.btn-soft { background: var(--surface); color: var(--nq-ink); }
.btn-soft:hover { background: var(--nq-panel-3); }
.btn-owned { background: var(--nq-green-soft); color: var(--nq-green); border-color: var(--nq-green-line); }
.btn-c { background: var(--c); color: #fff; }
.btn-c:hover { filter: brightness(1.06); box-shadow: 0 10px 24px color-mix(in srgb, var(--c) 35%, transparent); }
.btn .arr { display: inline-block; transition: transform .2s var(--ease); }
.btn:hover .arr { transform: translateX(3px); }
.btn-sm { padding: 9px 14px; font-size: 0.86rem; }

/* ── Small labels ── */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-ink);
}
.kicker::before { content: ''; width: 22px; height: 2px; background: var(--c); border-radius: 2px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border-radius: 999px;
  padding: 4px 11px;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
  line-height: 1.4;
}
.chip::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.chip.live { background: var(--nq-green-soft); color: var(--nq-green); }
.chip.live::before { box-shadow: 0 0 0 0 rgba(27, 127, 75, .45); animation: ping 2.2s infinite; }
.chip.soon { background: var(--nq-amber-soft); color: var(--nq-amber-ink); }
.chip.owned { background: var(--accent-light); color: var(--nq-sky-deep); }
@keyframes ping { 0% { box-shadow: 0 0 0 0 rgba(27, 127, 75, .45); } 70% { box-shadow: 0 0 0 7px rgba(27, 127, 75, 0); } 100% { box-shadow: 0 0 0 0 rgba(27, 127, 75, 0); } }

/* ── Reveal on scroll (stem-ui.js adds .in) ── */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .7s var(--ease); transition-delay: calc(var(--i, 0) * 70ms); }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  .chip.live::before { animation: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   /stem — hub
   ============================================================ */
.hero { padding: 56px 0 36px; position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(2.2rem, 4.6vw, 3.5rem); line-height: 1.08; margin: 18px 0 16px; letter-spacing: -0.02em; }
.hero h1 em { font-style: normal; color: var(--accent-dark); }
.hero-sub { font-size: 1.08rem; color: var(--text-muted); max-width: 46ch; }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-figures { display: flex; gap: 34px; margin-top: 38px; padding-top: 22px; border-top: 1px solid var(--border); flex-wrap: wrap; }
.figure strong { display: block; font-family: 'Space Grotesk', sans-serif; font-size: 1.9rem; line-height: 1; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.figure span { display: block; margin-top: 6px; font-size: 0.82rem; color: var(--text-muted); font-weight: 600; }

/* The deck: the four sections as tickets, fanned, tilting with the pointer. */
.deck { position: relative; height: 420px; perspective: 1200px; }
.deck-inner { position: absolute; inset: 0; transform-style: preserve-3d; transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)); transition: transform .35s var(--ease); }
.ticket {
  --t: var(--c);
  position: absolute;
  left: 50%;
  top: 50%;
  width: 290px;
  height: 170px;
  margin: -85px 0 0 -145px;
  border-radius: 20px;
  background: linear-gradient(145deg, var(--t) 0%, color-mix(in srgb, var(--t) 75%, var(--nq-navy)) 100%);
  color: #fff;
  padding: 18px 20px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 24px 50px rgba(13, 30, 45, .22), inset 0 1px 0 rgba(255, 255, 255, .25);
  transform: translate(var(--x), var(--y)) rotate(var(--r)) translateZ(var(--z));
  transition: transform .5s var(--ease), box-shadow .3s;
  will-change: transform;
}
.ticket::after { content: ''; position: absolute; inset: 0; border-radius: inherit; background: radial-gradient(120px 90px at 85% 15%, rgba(255, 255, 255, .22), transparent 70%); pointer-events: none; }
.ticket:hover { transform: translate(var(--x), var(--y)) rotate(0deg) translateZ(60px) scale(1.04); box-shadow: 0 36px 70px rgba(13, 30, 45, .3); z-index: 9; }
.ticket .t-badge { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 1.55rem; letter-spacing: -0.01em; display: flex; align-items: center; justify-content: space-between; }
.ticket .t-badge small { font-size: 0.72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; opacity: .85; }
.ticket .t-name { font-weight: 700; font-size: 1.05rem; }
.ticket .t-sub { font-size: 0.8rem; opacity: .82; }
.ticket .t-state { font-size: 0.78rem; font-weight: 700; display: inline-flex; gap: 6px; align-items: center; }
.ticket .t-state::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--nq-paper); }
.ticket .t-state.soon { opacity: .75; }
.ticket.k0 { --x: -120px; --y: -70px; --r: -12deg; --z: 0px; }
.ticket.k1 { --x: 40px; --y: -90px; --r: 6deg; --z: 20px; }
.ticket.k2 { --x: -60px; --y: 50px; --r: -4deg; --z: 40px; }
.ticket.k3 { --x: 110px; --y: 70px; --r: 10deg; --z: 60px; }
.deck-hint { position: absolute; bottom: -4px; left: 50%; transform: translateX(-50%); font-size: 0.76rem; color: var(--text-light); letter-spacing: .08em; text-transform: uppercase; font-weight: 700; }

/* Section list: one row per section. */
.sections { padding: 24px 0 8px; }
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.sec-head h2 { font-size: 1.6rem; margin-top: 10px; letter-spacing: -0.015em; }
.sec-head p { color: var(--text-muted); max-width: 52ch; }
.srows { list-style: none; border-top: 1px solid var(--border); }
.srow {
  --c: var(--accent);
  position: relative;
  display: grid;
  grid-template-columns: 56px 64px 1fr auto 44px;
  gap: 22px;
  align-items: center;
  padding: 24px 12px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  isolation: isolate;
}
.srow::before { content: ''; position: absolute; inset: 0; background: var(--c-soft); transform: scaleX(0); transform-origin: left; transition: transform .45s var(--ease); z-index: -1; }
.srow:hover::before, .srow:focus-visible::before { transform: scaleX(1); }
.srow:focus-visible { outline: none; box-shadow: inset 0 0 0 2px var(--c); }
.srow .ord { font-family: 'Space Grotesk', sans-serif; font-size: 1.6rem; font-weight: 700; color: var(--border); transition: color .3s; font-variant-numeric: tabular-nums; }
.srow:hover .ord { color: var(--c); }
.srow .badge {
  width: 64px; height: 64px; border-radius: 18px; background: var(--c); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 1.3rem;
  box-shadow: 0 10px 22px color-mix(in srgb, var(--c) 35%, transparent);
  transition: transform .4s var(--ease);
}
.srow:hover .badge { transform: rotate(-6deg) scale(1.06); }
.srow .name { font-size: 1.25rem; font-weight: 700; font-family: 'Space Grotesk', sans-serif; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.srow .sub { display: block; color: var(--text-muted); font-size: 0.9rem; margin-top: 2px; }
.srow .subjects { display: block; color: var(--text-light); font-size: 0.86rem; margin-top: 8px; }
.srow .subjects b { color: var(--text-muted); font-weight: 600; }
.srow .stat { text-align: right; min-width: 150px; }
.srow .stat strong { display: block; font-family: 'Space Grotesk', sans-serif; font-size: 1.15rem; line-height: 1.2; font-variant-numeric: tabular-nums; }
.srow .stat span { font-size: 0.82rem; color: var(--text-muted); }
.srow .go { width: 44px; height: 44px; border-radius: 50%; border: 1.5px solid var(--border); display: flex; align-items: center; justify-content: center; color: var(--nq-ink); transition: background .3s, border-color .3s, color .3s, transform .4s var(--ease); }
.srow:hover .go { background: var(--c); border-color: var(--c); color: #fff; transform: translateX(4px); }
.srow .go svg { width: 18px; height: 18px; }

/* How it works: a numbered line. */
.how { padding: 64px 0 40px; }
.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 28px; position: relative; }
.how-grid::before { content: ''; position: absolute; left: 0; right: 0; top: 30px; height: 1px; background: linear-gradient(90deg, transparent, var(--border) 15%, var(--border) 85%, transparent); }
.step { position: relative; padding-top: 14px; isolation: isolate; }
.step .n { position: relative; width: 34px; height: 34px; border-radius: 50%; background: var(--nq-paper); border: 2px solid var(--nq-ink); color: var(--nq-ink); display: flex; align-items: center; justify-content: center; font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 0.9rem; margin-bottom: 18px; transition: background .3s, color .3s, transform .4s var(--ease); }
.step:hover .n { background: var(--primary); color: var(--accent); transform: scale(1.08); }
.step .ghost { position: absolute; right: 0; top: -14px; font-family: 'Space Grotesk', sans-serif; font-size: 4.4rem; font-weight: 700; line-height: 1; color: var(--surface); z-index: -1; letter-spacing: -0.04em; }
.step h3 { font-size: 1.1rem; margin-bottom: 6px; }
.step p { color: var(--text-muted); font-size: 0.92rem; max-width: 34ch; }

/* Closing band. */
.band { background: var(--primary); color: #fff; padding: 44px 0; margin-top: 30px; position: relative; overflow: hidden; }
.band::after { content: ''; position: absolute; width: 520px; height: 520px; right: -180px; top: -260px; border-radius: 50%; background: radial-gradient(circle, rgba(75, 189, 232, .35), transparent 65%); pointer-events: none; }
.band-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; position: relative; z-index: 1; }
.band h2 { font-size: 1.5rem; }
.band p { color: rgba(255, 255, 255, .75); margin-top: 6px; max-width: 56ch; }
.band .kicker { color: var(--accent); }
.band .kicker::before { background: var(--accent); }

/* ============================================================
   Section pages — grade and STEM Seekers
   ============================================================ */
.crumbs { font-size: 0.86rem; color: var(--text-muted); padding: 18px 0 0; display: flex; gap: 8px; align-items: center; }
.crumbs a { color: var(--accent-dark); text-decoration: none; font-weight: 600; }
.crumbs span { color: var(--text-light); }

.ghead { position: relative; overflow: hidden; padding: 36px 0 40px; }
.ghead::before { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, var(--c-soft) 0%, var(--nq-paper) 100%); z-index: -2; }
.ghead .ghost { position: absolute; right: -10px; top: -30px; font-family: 'Space Grotesk', sans-serif; font-size: clamp(9rem, 26vw, 19rem); font-weight: 700; line-height: 1; color: transparent; -webkit-text-stroke: 1.5px color-mix(in srgb, var(--c) 28%, transparent); letter-spacing: -0.05em; user-select: none; pointer-events: none; z-index: -1; direction: ltr; transform: translateY(var(--py, 0px)); }
.ghead h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.05; margin: 14px 0 12px; letter-spacing: -0.02em; }
.ghead .tagline { color: var(--text-muted); font-size: 1.05rem; max-width: 56ch; }
.ghead-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 20px; }
.gfigures { display: flex; gap: 0; margin-top: 26px; border: 1px solid var(--border); border-radius: var(--radius-lg); background: color-mix(in srgb, var(--nq-paper) 82%, transparent); backdrop-filter: blur(6px); width: fit-content; max-width: 100%; overflow: hidden; }
.gfig { padding: 14px 22px; min-width: 120px; }
.gfig + .gfig { border-left: 1px solid var(--border); }
.gfig strong { display: block; font-family: 'Space Grotesk', sans-serif; font-size: 1.6rem; line-height: 1; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; color: var(--c-ink); }
.gfig span { display: block; margin-top: 5px; font-size: 0.78rem; color: var(--text-muted); font-weight: 600; }

.note-line { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-radius: var(--radius-md); background: var(--nq-amber-soft); border: 1px solid var(--nq-amber-line); color: var(--nq-amber-ink); font-size: 0.92rem; margin: 24px 0 0; }
.note-line.live { background: var(--nq-green-soft); border-color: var(--nq-green-line); color: var(--nq-green); }
.note-line svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 2px; }

.block { padding: 28px 0 0; }
.block-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.block-head h2 { font-size: 1.35rem; }
.block-head p { color: var(--text-muted); font-size: 0.9rem; }

/* Bundles */
.bundle {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 22px 24px 22px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--nq-paper);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow .3s, transform .3s var(--ease);
}
.bundle + .bundle { margin-top: 12px; }
.bundle::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 6px; background: var(--c); }
.bundle:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.bundle h3 { font-size: 1.2rem; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.bundle p { color: var(--text-muted); font-size: 0.9rem; margin-top: 4px; }
.bundle .includes { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.bundle .includes span { background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 2px 10px; font-size: 0.78rem; font-weight: 600; }
.bundle .price-row { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-top: 10px; }
.bundle .now { font-family: 'Space Grotesk', sans-serif; font-size: 1.7rem; font-weight: 700; letter-spacing: -0.02em; }
.bundle .was { color: var(--text-light); text-decoration: line-through; }
.bundle .save { background: var(--c-soft); color: var(--c-ink); border-radius: 999px; padding: 3px 10px; font-size: 0.78rem; font-weight: 700; }

/* Question lookup */
.qsearch { display: flex; gap: 8px; margin-top: 28px; }
.qsearch label { position: relative; flex: 1; min-width: 0; }
.qsearch svg { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 18px; height: 18px; color: var(--text-light); }
.qsearch input { width: 100%; height: 48px; border: 1.5px solid var(--border); border-radius: var(--radius-md); padding: 0 14px 0 42px; font: inherit; font-size: 0.95rem; background: var(--nq-paper); transition: border-color .2s, box-shadow .2s; }
.qsearch input:focus { outline: none; border-color: var(--c); box-shadow: 0 0 0 4px var(--c-soft); }
.qsearch .btn { height: 48px; }

/* Subjects ledger */
.ledger { border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--nq-paper); overflow: hidden; }
.subject + .subject { border-top: 1px solid var(--border); }
.subject.open { background: color-mix(in srgb, var(--c) 4%, var(--nq-paper)); }
.subject .head {
  width: 100%; background: none; border: none; cursor: pointer; text-align: left;
  display: grid; grid-template-columns: 52px 1fr auto 28px; gap: 16px; align-items: center;
  padding: 16px 18px; color: inherit; transition: background .2s;
}
.subject .head:hover { background: color-mix(in srgb, var(--c) 5%, var(--nq-paper)); }
.subject .head:focus-visible { outline: none; box-shadow: inset 0 0 0 2px var(--c); }
.mono {
  width: 52px; height: 52px; border-radius: 14px; flex-shrink: 0;
  background: var(--c-soft); color: var(--c-ink);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 1.05rem; letter-spacing: .02em;
  transition: transform .4s var(--ease), background .3s, color .3s;
}
.subject.open .mono, .subject .head:hover .mono { background: var(--c); color: #fff; }
.subject .head:hover .mono { transform: rotate(-6deg); }
.subject h3 { font-size: 1.1rem; }
.subject .meta { color: var(--text-muted); font-size: 0.86rem; }
.subject .chev { width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; color: var(--text-light); transition: transform .35s var(--ease), color .2s; }
.subject .chev svg { width: 18px; height: 18px; }
.subject.open .chev { transform: rotate(180deg); color: var(--c-ink); }
.subject .panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .45s var(--ease); }
.subject.open .panel { grid-template-rows: 1fr; }
.subject .panel > div { overflow: hidden; }
.los { border-top: 1px solid var(--border); }
.lo { display: grid; grid-template-columns: 1fr auto; gap: 14px; align-items: center; padding: 14px 18px 14px 86px; }
.lo + .lo { border-top: 1px dashed var(--border); }
.lo-title { font-weight: 700; }
.lo-meta { color: var(--text-muted); font-size: 0.84rem; }
.lo-side { display: flex; align-items: center; gap: 14px; }
.lo-price { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 1.1rem; letter-spacing: -0.01em; }
.lo-empty { padding: 14px 18px 16px 86px; color: var(--text-muted); font-size: 0.9rem; }
.lo-empty a { color: var(--accent-dark); font-weight: 700; text-decoration: none; }

/* Three facts in a strip */
.facts { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 40px; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; background: var(--surface); }
.fact { padding: 20px 22px; display: flex; gap: 14px; align-items: flex-start; }
.fact + .fact { border-left: 1px solid var(--border); }
.fact svg { width: 22px; height: 22px; color: var(--c-ink); flex-shrink: 0; margin-top: 2px; }
.fact h3 { font-size: 0.98rem; }
.fact p { color: var(--text-muted); font-size: 0.86rem; }

/* Other sections */
.others { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 14px; }
.other { --oc: var(--accent); display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius-md); text-decoration: none; background: var(--nq-paper); transition: transform .3s var(--ease), border-color .2s, box-shadow .3s; }
.other:hover { transform: translateY(-3px); border-color: var(--oc); box-shadow: var(--shadow-md); }
.other .ob { width: 40px; height: 40px; border-radius: 12px; background: var(--oc); color: #fff; display: flex; align-items: center; justify-content: center; font-family: 'Space Grotesk', sans-serif; font-weight: 700; flex-shrink: 0; direction: ltr; }
.other strong { display: block; font-size: 0.95rem; }
.other span { font-size: 0.78rem; color: var(--text-muted); }

.contact-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 36px 0 72px; }
.state { border: 1px dashed var(--border); border-radius: var(--radius-lg); padding: 32px; text-align: center; color: var(--text-muted); margin-top: 24px; }
.state a { color: var(--accent-dark); font-weight: 700; }

/* STEM Seekers: the system chooser */
.chooser { margin-top: 28px; border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 28px; background: var(--nq-paper); box-shadow: var(--shadow-sm); }
.chooser h2 { font-size: 1.4rem; }
.chooser .sub { color: var(--text-muted); margin-top: 6px; }
.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin-top: 20px; }
.choice { position: relative; border: 1.5px solid var(--border); border-radius: var(--radius-lg); padding: 22px; background: var(--nq-paper); cursor: pointer; text-align: left; transition: border-color .2s, transform .3s var(--ease), box-shadow .3s; overflow: hidden; }
.choice::after { content: ''; position: absolute; inset: auto 0 0 0; height: 4px; background: var(--c); transform: scaleX(0); transform-origin: left; transition: transform .4s var(--ease); }
.choice:hover { border-color: var(--c); transform: translateY(-3px); box-shadow: var(--shadow-md); }
.choice:hover::after { transform: scaleX(1); }
.choice .big { font-family: 'Space Grotesk', sans-serif; font-size: 1.4rem; font-weight: 700; display: block; }
.choice .what { color: var(--text-muted); font-size: 0.9rem; margin-top: 6px; display: block; line-height: 1.55; }
.trackbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; background: var(--c-soft); border: 1px solid color-mix(in srgb, var(--c) 25%, #fff); border-radius: var(--radius-md); padding: 12px 16px; margin-top: 24px; }
.trackbar strong { font-size: 0.98rem; }
.trackbar .who { color: var(--text-muted); font-size: 0.86rem; }
.linkbtn { background: none; border: none; color: var(--c-ink); font-weight: 700; cursor: pointer; font-size: 0.9rem; padding: 6px 10px; border-radius: var(--radius-sm); }
.linkbtn:hover { background: var(--nq-paper); }
.sgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.scard { border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 18px; background: var(--nq-paper); display: flex; flex-direction: column; gap: 8px; transition: transform .3s var(--ease), box-shadow .3s, border-color .2s; }
.scard:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--c); }
.scard .top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.scard h3 { font-size: 1.08rem; }
.scard .meta { color: var(--text-muted); font-size: 0.86rem; }
.scard .price { font-family: 'Space Grotesk', sans-serif; font-size: 1.35rem; font-weight: 700; letter-spacing: -0.02em; margin-top: 4px; }
.scard .btn { margin-top: auto; }

/* ── Responsive ── */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .deck { display: none; }
  .srow { grid-template-columns: 56px 1fr auto; gap: 16px; }
  .srow .ord { display: none; }
  .srow .stat { grid-column: 2; text-align: left; min-width: 0; }
  .srow .go { grid-column: 3; grid-row: 1 / span 2; }
  .how-grid { grid-template-columns: 1fr; gap: 22px; }
  .how-grid::before { display: none; }
  .facts { grid-template-columns: 1fr; }
  .fact + .fact { border-left: 0; border-top: 1px solid var(--border); }
  .others { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .hero { padding: 36px 0 24px; }
  .hero-figures { gap: 22px; }
  .srow { padding: 18px 8px; grid-template-columns: 52px 1fr 40px; }
  .srow .badge { width: 52px; height: 52px; border-radius: 14px; font-size: 1.05rem; }
  .srow .name { font-size: 1.1rem; }
  .srow .go { width: 40px; height: 40px; }
  .ghead { padding: 24px 0 28px; }
  .ghead .ghost { font-size: 8rem; right: -14px; top: 0; }
  .gfigures { width: 100%; }
  .gfig { flex: 1; min-width: 0; padding: 12px 14px; }
  .gfig strong { font-size: 1.3rem; }
  .bundle { grid-template-columns: 1fr; }
  .subject .head { grid-template-columns: 44px 1fr 24px; }
  .subject .head .chip { grid-column: 2; justify-self: start; }
  .mono { width: 44px; height: 44px; border-radius: 12px; font-size: 0.95rem; }
  .lo, .lo-empty { padding-left: 18px; grid-template-columns: 1fr; }
  .lo-side { justify-content: space-between; }
  .qsearch { flex-direction: column; }
  .band h2 { font-size: 1.25rem; }
}