:root {
  --bg: #060a14;
  --bg-2: #0b1322;
  --panel: #101a2e;
  --panel-2: #15233c;
  --line: #24365a;
  --text: #e8eef7;
  --muted: #94a6c0;
  --green: #76b900;      /* NVIDIA green — brand + primary CTAs */
  --green-2: #9be600;
  --accent: #4cc2ff;     /* electric blue — the store's dominant hue */
  --accent-2: #2f6bff;   /* deep blue */
  --danger: #ff5d5d;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  /* Deep-blue "datacenter blueprint": strong blue washes + a faint engineering
     grid, so the store looks like the hardware it sells. */
  background:
    repeating-linear-gradient(0deg,  rgba(76,194,255,.05) 0 1px, transparent 1px 52px),
    repeating-linear-gradient(90deg, rgba(76,194,255,.05) 0 1px, transparent 1px 52px),
    radial-gradient(1400px 720px at 85% -12%, rgba(47,107,255,.34), transparent 62%),
    radial-gradient(1000px 640px at -8% 12%, rgba(76,194,255,.22), transparent 58%),
    radial-gradient(1000px 640px at 50% 118%, rgba(47,107,255,.22), transparent 62%),
    linear-gradient(180deg, #0a142c, var(--bg) 46%);
  background-attachment: fixed;
  min-height: 100vh;
  color: var(--text);
  font: 16px/1.6 "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  letter-spacing: .1px;
}

/* Typography voices: Space Grotesk for display, JetBrains Mono for numbers —
   headlines read like a tech brand, figures read like a spec sheet. */
h1, h2, h3, h4, .brand-name {
  font-family: "Space Grotesk", "Inter", "Segoe UI", system-ui, sans-serif;
  letter-spacing: -.01em;
}
.stat-value, .bar-val, .build-line .qty, .reqnum strong, code, .mono, td.mono {
  font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-variant-numeric: tabular-nums;
}

a { color: var(--accent); text-decoration: none; }
code { background: var(--panel-2); padding: .15em .45em; border-radius: 6px; color: var(--green-2); font-size: .92em; }

/* Header / footer */
header.site {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
  background: rgba(6,12,28,.78); backdrop-filter: blur(12px);
}
.brand { display: flex; align-items: center; gap: .6rem; color: var(--text); font-weight: 700; }
.brand-mark { color: var(--green); font-size: 1.4rem; }
.brand-name { font-size: 1.05rem; letter-spacing: .3px; }
header nav { display: flex; gap: .4rem; flex-wrap: wrap; }
header nav a {
  color: var(--muted); padding: .45rem .8rem; border-radius: 999px; font-size: .92rem;
  border: 1px solid transparent;
}
header nav a:hover { color: var(--text); background: var(--panel); }
header nav a.active { color: var(--green-2); border-color: var(--line); background: var(--panel); }

main { max-width: 1120px; margin: 0 auto; padding: clamp(1.5rem, 4vw, 3rem); }

footer.site {
  max-width: 1120px; margin: 2rem auto 3rem; padding: 1.5rem clamp(1rem, 4vw, 3rem) 0;
  border-top: 1px solid var(--line); color: var(--muted);
}
footer .fine { font-size: .85rem; }

/* Hero */
.hero { padding: 2.5rem 0 1.5rem; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem); margin: 0 0 .5rem; line-height: 1.05;
  background: linear-gradient(120deg, #fff 10%, var(--accent) 45%, var(--green-2) 85%); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { font-size: 1.25rem; color: var(--text); margin: .3rem 0; }
.sub { color: var(--muted); max-width: 60ch; }
.cta-row { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.4rem; }

/* Buttons */
.btn {
  display: inline-block; padding: .7rem 1.15rem; border-radius: 10px;
  border: 1px solid var(--line); color: var(--text); background: var(--panel);
  font-weight: 600; cursor: pointer; transition: transform .06s ease, background .15s;
}
.btn:hover { transform: translateY(-1px); background: var(--panel-2); }
.btn.primary { background: linear-gradient(120deg, var(--green), #5a9000); color: #06210a; border-color: transparent; }
.btn.primary:hover { background: linear-gradient(120deg, var(--green-2), var(--green)); }
.btn.ghost { background: transparent; }

/* Cards + grids */
.card {
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.4rem; box-shadow: var(--shadow); margin-bottom: 1.2rem;
}
.grid { display: grid; gap: 1.2rem; }
.grid.one { grid-template-columns: 1fr; }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(min(340px, 100%), 1fr)); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }

.page-head { margin-bottom: 1.4rem; }
.page-head h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 .4rem; }
.page-head h1::after {
  content: ""; display: block; width: 64px; height: 4px; margin-top: .5rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent), var(--green-2));
}
.page-head p { color: var(--muted); max-width: 75ch; }
.math-line code { display: inline-block; margin-top: .4rem; }

.feature h3 { margin: .2rem 0 .5rem; color: var(--green-2); }
.explainer h2 { margin-top: 0; }

/* Product / model cards */
.product .tier, .model .params {
  display: inline-block; font-size: .72rem; text-transform: uppercase; letter-spacing: .12em;
  color: var(--accent); border: 1px solid rgba(76,194,255,.35); padding: .2rem .55rem;
  border-radius: 999px; background: rgba(47,107,255,.08);
}
.product h3, .model h3 { margin: .6rem 0 .3rem; }
.blurb { color: var(--muted); }
.realworld { font-size: .9rem; color: var(--muted); border-top: 1px dashed var(--line); padding-top: .8rem; margin-top: .4rem; }
.model .license { color: var(--accent); font-size: .85rem; margin: .1rem 0 .4rem; }
.model h4 { margin: 1.1rem 0 .5rem; color: var(--text); }

/* Stat + explanation unit */
.stats { display: grid; gap: .55rem; margin: .8rem 0; }
.stat { background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: .6rem .8rem; }
.stat-head { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; }
.stat-label { color: var(--muted); font-size: .9rem; }
.stat-value { font-weight: 700; color: var(--text); text-align: right; }
.explain { margin-top: .35rem; }
.explain summary {
  cursor: pointer; color: var(--accent); font-size: .82rem; list-style: none; user-select: none;
}
.explain summary::before { content: "ⓘ "; }
.explain summary::-webkit-details-marker { display: none; }
.explain[open] summary { color: var(--green-2); }
.explain p { color: var(--muted); font-size: .88rem; margin: .5rem 0 0; }
.explain p.when { color: var(--text); }

/* Build block */
.build-line { display: flex; align-items: baseline; gap: .6rem; font-size: 1.15rem; margin-bottom: .3rem; }
.build-line .qty { color: var(--green-2); font-weight: 800; }
.build-line .unit { font-weight: 600; }
.cluster { margin: .6rem 0; padding: .6rem .8rem; border-radius: 10px; border: 1px solid var(--line); background: var(--bg-2); }
.cluster.on { border-color: rgba(118,185,0,.4); }

/* Journeys */
.journey h3 { color: var(--green-2); margin-top: 0; }
.journey .why { color: var(--muted); }
.journey h4 { margin: 1rem 0 .5rem; }

/* Form */
.form-card form { display: grid; gap: 1rem; max-width: 480px; }
.form-card label { display: grid; gap: .35rem; color: var(--muted); font-size: .9rem; }
.form-card input {
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
  padding: .7rem .8rem; color: var(--text); font-size: 1rem;
}
.form-card input:focus { outline: 2px solid var(--green); border-color: transparent; }
.quote-summary { border: 1px solid var(--line); border-radius: 10px; padding: 1rem; margin-bottom: 1.2rem; background: var(--bg-2); }
.quote-summary h3 { margin-top: 0; color: var(--green-2); }
.quote-summary p { margin: .3rem 0; color: var(--muted); }

/* Confirmation */
.confirm .reqnum { font-size: 1.4rem; }
.confirm .reqnum strong { color: var(--green-2); }
.muted { color: var(--muted); }

/* Table */
.table-card { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: .6rem .7rem; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; }
td.mono, .mono { font-variant-numeric: tabular-nums; font-family: ui-monospace, "SF Mono", Menlo, monospace; }
td.empty { text-align: center; color: var(--muted); padding: 2rem; }

@media (max-width: 640px) {
  header.site { flex-direction: column; align-items: flex-start; }
}

/* --------------------------------------------------------------------------
   Motion & animation — tasteful, GPU-cheap, and fully disabled for users
   who prefer reduced motion.
   -------------------------------------------------------------------------- */

/* Scroll reveal (elements get .reveal from app.js, .in when visible) */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s ease, transform .55s cubic-bezier(.2, .7, .3, 1);
  will-change: opacity, transform;
}
.reveal.in { opacity: 1; transform: none; }

/* Hero title shimmer */
.hero h1 {
  background-size: 200% auto;
  animation: shimmer 7s ease-in-out infinite alternate;
}
@keyframes shimmer {
  from { background-position: 0% center; }
  to   { background-position: 100% center; }
}

/* Brand lightning pulse */
.brand-mark {
  display: inline-block;
  transform-origin: 50% 60%;
  animation: sparkle 3s ease-in-out infinite;
}
@keyframes sparkle {
  0%, 100% { transform: scale(1);    filter: drop-shadow(0 0 0 rgba(155,230,0,0)); }
  50%      { transform: scale(1.12); filter: drop-shadow(0 0 7px rgba(155,230,0,.55)); }
}

/* Card hover: lift + green glow */
.card { transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease; }
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(76,194,255,.5);
  box-shadow: 0 14px 40px rgba(0,0,0,.45),
              0 0 0 1px rgba(76,194,255,.14),
              0 0 28px rgba(47,107,255,.12);
}

/* Stat rows warm up on hover */
.stat { transition: border-color .2s ease, background .2s ease; }
.stat:hover { border-color: rgba(53,193,255,.45); background: var(--panel); }

/* Buttons: lift + sheen sweep on primary */
.btn { position: relative; overflow: hidden; transition: transform .15s ease, background .2s, box-shadow .2s; }
.btn:hover { transform: translateY(-2px); }
.btn.primary:hover { box-shadow: 0 6px 24px rgba(118,185,0,.35); }
.btn.primary::after {
  content: ""; position: absolute; top: 0; left: -70%; width: 45%; height: 100%;
  background: linear-gradient(115deg, transparent, rgba(255,255,255,.35), transparent);
  transform: skewX(-20deg); transition: left .5s ease; pointer-events: none;
}
.btn.primary:hover::after { left: 130%; }

/* Explanations slide open gently */
.explain p { animation: fadeDown .3s ease both; }
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}

/* Nav + table rows */
header nav a { transition: color .2s ease, background .2s ease; }
tbody tr { transition: background .15s ease; }
tbody tr:hover { background: rgba(53,193,255,.05); }

/* Accessibility: honor reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero h1, .brand-mark { animation: none; }
  .card, .btn, .stat { transition: none; }
}

/* --------------------------------------------------------------------------
   Aurora background — two slow-drifting blue glows behind the content.
   -------------------------------------------------------------------------- */
body::before, body::after {
  content: ""; position: fixed; z-index: -1; border-radius: 50%;
  filter: blur(80px); opacity: .55; pointer-events: none;
}
body::before {
  width: 780px; height: 780px; top: -260px; right: -180px;
  background: radial-gradient(circle, rgba(47,107,255,.55), rgba(76,194,255,.2) 45%, transparent 68%);
  animation: drift1 22s ease-in-out infinite alternate;
}
body::after {
  width: 680px; height: 680px; bottom: -240px; left: -180px;
  background: radial-gradient(circle, rgba(76,194,255,.45), rgba(47,107,255,.18) 45%, transparent 68%);
  animation: drift2 28s ease-in-out infinite alternate;
}
@keyframes drift1 { to { transform: translate(-170px, 120px) scale(1.2); } }
@keyframes drift2 { to { transform: translate(190px, -110px) scale(1.15); } }

/* --------------------------------------------------------------------------
   Compare page — product chips + animated bars.
   -------------------------------------------------------------------------- */
.compare-picker { display: flex; flex-wrap: wrap; gap: .5rem; margin: .4rem 0 1.2rem; }
.chip {
  border: 1px solid var(--line); background: var(--panel); border-radius: 999px;
  padding: .5rem .95rem; cursor: pointer; color: var(--muted); font-size: .9rem;
  transition: all .2s ease; user-select: none;
}
.chip:hover { transform: translateY(-1px); border-color: var(--accent); color: var(--text); }
.chip.on {
  color: #041018; font-weight: 700; border-color: transparent;
  background: linear-gradient(120deg, var(--accent-2), var(--accent));
  box-shadow: 0 4px 18px rgba(47,107,255,.35);
}
.bar-group { margin-top: 1.3rem; }
.bar-group h4 { margin: 0 0 .2rem; }
.bar-group .bar-note { color: var(--muted); font-size: .85rem; margin: 0 0 .6rem; }
.bar-row { display: grid; grid-template-columns: 230px 1fr 120px; gap: .7rem; align-items: center; margin: .4rem 0; }
.bar-name { font-size: .88rem; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-track { display: block; background: var(--bg-2); border: 1px solid var(--line); border-radius: 999px; height: 14px; overflow: hidden; }
.bar-fill {
  display: block;
  height: 100%; border-radius: 999px; width: 0;
  transition: width .8s cubic-bezier(.2, .7, .3, 1);
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
}
.bar-fill.green { background: linear-gradient(90deg, #5a9000, var(--green-2)); }
.bar-fill.amber { background: linear-gradient(90deg, #b8860b, #ffd34d); }
.bar-val { font-size: .88rem; text-align: right; font-variant-numeric: tabular-nums; }
@media (max-width: 640px) {
  .bar-row { grid-template-columns: 1fr; gap: .15rem; }
  .bar-val { text-align: left; }
}

/* --------------------------------------------------------------------------
   Find-my-match wizard.
   -------------------------------------------------------------------------- */
.wizard .progress {
  height: 6px; background: var(--bg-2); border: 1px solid var(--line);
  border-radius: 999px; overflow: hidden; margin-bottom: 1.4rem;
}
.wizard .progress i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transition: width .45s ease;
}
.wstep { display: none; }
.wstep.on { display: block; animation: stepIn .4s ease both; }
@keyframes stepIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.option-grid { display: grid; gap: .8rem; margin-top: 1rem; }
.opt {
  text-align: left; border: 1px solid var(--line); border-radius: 12px;
  background: var(--panel); color: var(--text); padding: 1rem 1.1rem;
  cursor: pointer; transition: all .2s ease; font: inherit; font-size: 1rem;
}
.opt small { display: block; color: var(--muted); margin-top: .25rem; }
.opt:hover { border-color: var(--accent); transform: translateX(5px); background: var(--panel-2); }
.wizard .back { margin-top: 1.2rem; background: transparent; }
.match-result .big { font-size: 1.45rem; margin: .3rem 0 .1rem; color: var(--accent); }
.match-note {
  border: 1px solid rgba(255,211,77,.4); background: rgba(255,211,77,.06);
  border-radius: 10px; padding: .7rem .9rem; margin: .8rem 0; font-size: .92rem;
}

@media (prefers-reduced-motion: reduce) {
  body::before, body::after { animation: none; }
  .bar-fill, .wizard .progress i { transition: none; }
  .wstep.on { animation: none; }
}

/* --------------------------------------------------------------------------
   Circuitscape — AI chips etched into the background, with circuit traces
   and light pulses traveling along them like data packets. Plus a slowly
   scrolling perspective floor. Built by app.js as progressive enhancement.
   -------------------------------------------------------------------------- */
.circuitscape {
  position: fixed; inset: 0; z-index: -1;
  pointer-events: none; overflow: hidden;
}
.circuitscape .floor {
  position: absolute; left: -25%; right: -25%; bottom: -42%; height: 62%;
  background:
    repeating-linear-gradient(90deg, rgba(76,194,255,.14) 0 1px, transparent 1px 90px),
    repeating-linear-gradient(0deg,  rgba(76,194,255,.14) 0 1px, transparent 1px 64px);
  transform: perspective(650px) rotateX(58deg);
  transform-origin: 50% 0;
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.8), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0,0,0,.8), transparent 78%);
  animation: floorscroll 16s linear infinite;
}
@keyframes floorscroll {
  from { background-position: 0 0, 0 0; }
  to   { background-position: 0 0, 0 64px; }
}
.circuitscape svg { width: 100%; height: 100%; display: block; }
.chip-body { fill: rgba(12,22,44,.8); stroke: rgba(76,194,255,.4); stroke-width: 1.5; }
.chip-die  { fill: rgba(47,107,255,.16); stroke: rgba(76,194,255,.55); stroke-width: 1; animation: diePulse 4.5s ease-in-out infinite; }
.chip-pin  { stroke: rgba(76,194,255,.45); stroke-width: 2; }
.chip-label {
  fill: #7fd4ff; font-family: "JetBrains Mono", ui-monospace, monospace;
  font-weight: 700; letter-spacing: .08em; opacity: .9;
}
.trace { fill: none; stroke: rgba(76,194,255,.22); stroke-width: 1.5; }
.trace-end { fill: #4cc2ff; animation: ledblink 2.8s ease-in-out infinite; }
.trace-end.amber { fill: #f2a93b; }
.pulse { fill: #a8dcff; filter: drop-shadow(0 0 4px #4cc2ff); }
@keyframes diePulse {
  0%, 100% { fill: rgba(47,107,255,.14); }
  50%      { fill: rgba(76,194,255,.32); }
}
@keyframes ledblink {
  0%, 100% { opacity: .2; }
  50%      { opacity: 1; }
}
@media (max-width: 980px) {
  .circuitscape svg { display: none; }   /* keep small screens clean; floor stays */
}
@media (prefers-reduced-motion: reduce) {
  .circuitscape { display: none; }
}

/* --------------------------------------------------------------------------
   Mobile polish — tighter header, scrollable pill nav, comfortable spacing.
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  header.site { padding: .7rem 1rem; gap: .5rem; }
  header nav {
    width: 100%; flex-wrap: nowrap; overflow-x: auto;
    -webkit-overflow-scrolling: touch; scrollbar-width: none;
    padding-bottom: .2rem; margin: 0 -1rem; padding-left: 1rem; padding-right: 1rem;
  }
  header nav::-webkit-scrollbar { display: none; }
  header nav a { white-space: nowrap; font-size: .88rem; padding: .4rem .7rem; }
  .hero { padding: 1.6rem 0 1rem; }
  .lede { font-size: 1.1rem; }
  .cta-row .btn { flex: 1 1 46%; text-align: center; }
  .card { padding: 1.1rem; }
  .stat-head { flex-wrap: wrap; gap: .25rem .8rem; }
  .stat-value { text-align: left; }
  .build-line { font-size: 1.05rem; flex-wrap: wrap; }
  table { font-size: .84rem; }
  th, td { padding: .5rem .5rem; }
  .opt { padding: .85rem .9rem; }
  .compare-picker { gap: .4rem; }
  .chip { padding: .42rem .75rem; font-size: .84rem; }
}

/* --------------------------------------------------------------------------
   The Math Lab — the parameters→hardware slider on the models page.
   -------------------------------------------------------------------------- */
.mathlab h2 { margin-top: 0; }
.lab-slider-row { display: flex; align-items: center; gap: 1.2rem; margin: 1rem 0 .6rem; flex-wrap: wrap; }
.lab-params-label { font-size: 1.15rem; white-space: nowrap; }
.lab-params-label b { color: var(--accent); font-family: "JetBrains Mono", monospace; font-size: 1.35rem; }
#lab-params {
  flex: 1 1 260px; height: 8px; appearance: none; -webkit-appearance: none;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  border-radius: 999px; outline: none; cursor: pointer;
}
#lab-params::-webkit-slider-thumb {
  -webkit-appearance: none; width: 26px; height: 26px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #d6f1ff, var(--accent) 60%, var(--accent-2));
  border: 2px solid #fff2; box-shadow: 0 0 14px rgba(76,194,255,.6); cursor: grab;
}
#lab-params::-moz-range-thumb {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent); border: 2px solid #fff3;
  box-shadow: 0 0 14px rgba(76,194,255,.6); cursor: grab;
}
.lab-math { color: var(--green-2); background: var(--bg-2); border: 1px solid var(--line);
  border-radius: 8px; padding: .55rem .8rem; font-size: .92rem; overflow-x: auto; white-space: nowrap; }
.lab-build { font-size: 1.2rem; font-weight: 700; margin: .8rem 0 .6rem; }
.lab-build .qty { color: var(--green-2); font-family: "JetBrains Mono", monospace; }
.lab-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(150px, 100%), 1fr)); gap: .6rem; }
.lab-cell { background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: .6rem .7rem; }
.lab-cell span { display: block; font-family: "JetBrains Mono", monospace; font-weight: 700; font-size: 1.05rem; }
.lab-cell small { color: var(--muted); }
.lab-note { margin: .7rem 0 0; font-size: .9rem; }