/* Inter, self-hosted — the same files as ariantra.com (fonts/OFL.txt is the licence). */
@font-face { font-family: "Inter"; font-style: normal; font-weight: 100 900; font-display: swap;
  src: url("assets/fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 100 900; font-display: swap;
  src: url("assets/fonts/inter-rupee.woff2") format("woff2"); unicode-range: U+20B9; }
/* Arial sized to Inter's shape, so the page does not jump when Inter arrives. Same list as ariantra.com. */
@font-face { font-family: "Inter Fallback";
  src: local("Arial"), local("Liberation Sans"), local("Helvetica Neue"), local("Helvetica"), local("Nimbus Sans"), local("Albany AMT");
  size-adjust: 107.12%; ascent-override: 90.49%; descent-override: 22.56%; line-gap-override: 0%; }

/* Ariantra AI Foundry — design tokens. Never hardcode colours in pages; extend here.
   Look: quiet and premium. Generous but not empty space, light headings, hairlines
   instead of boxes, the accent used sparingly (the logo dot, small markers, a soft glow
   behind the hero, button hover). Tinted bands (--surface-2) break up long white runs. */
:root {
  --accent: #FF5C00;
  --accent-deep: #C24600;
  --accent-light: #FFF0E8;
  --ink: #0f172a;
  --ink-muted: #5A6478;
  --ink-soft: #64748b;
  --surface: #FFFFFF;
  --surface-2: #FAF8F6;
  --card: #FFFFFF;
  --line: #E7E5E4;
  --glow: color-mix(in srgb, var(--accent) 14%, transparent);
  --shadow: 0 1px 2px rgb(15 23 42 / .04), 0 12px 32px -8px rgb(15 23 42 / .12);
  --on-accent: #FFFFFF;
  --panel: #0f172a;
  --on-panel: #FFFFFF;
  --radius: 999px;
  --maxw: 1120px;
  --measure: 640px;
  --space-section: clamp(64px, 8vw, 112px);
  --font: "Inter", "Inter Fallback", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #F1F5F9; --ink-muted: #B6BFCC; --ink-soft: #94A3B8;
    --surface: #0B1220; --surface-2: #0F1729; --card: #131D33; --line: #1F2A40;
    --panel: #131D33; --on-panel: #F1F5F9;
    --glow: color-mix(in srgb, var(--accent) 18%, transparent);
    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 16px 40px -10px rgb(0 0 0 / .6);
    --accent-light: #2A1608; --accent-deep: #FF8A4C;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--surface); line-height: 1.7; font-size: 17px; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration-color: var(--line); text-underline-offset: 4px; transition: text-decoration-color .2s, color .2s; }
a:hover { text-decoration-color: var(--accent); }
img { max-width: 100%; height: auto; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
@media (max-width: 520px) { .wrap { padding: 0 16px; } }
.skip { position: absolute; left: -999px; } .skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 8px; z-index: 10; }

/* Header */
header.site { background: color-mix(in srgb, var(--surface) 88%, transparent); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); position: sticky; top: 0; z-index: 5; }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 88px; gap: 16px; }
/* Logo — copied from ariantra.com's nav (text, line-dot-line, sub-line). */
.logo { display: flex; flex-direction: column; align-items: flex-start; text-decoration: none; }
.logo-text { font-size: 17px; font-weight: 300; letter-spacing: 7px; text-transform: uppercase; color: var(--ink); line-height: 1; }
.logo-divider { display: flex; align-items: center; width: 100%; gap: 5px; margin: 4px 0 3px; }
.logo-line { flex: 1; height: 1px; background: var(--ink); opacity: .3; }
.logo-dot { width: 4px; height: 4px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }
.logo-sub { font-size: 7px; font-weight: 500; letter-spacing: 2.5px; text-transform: uppercase; color: var(--ink-soft); line-height: 1; }
nav.main { display: flex; gap: 36px; }
nav.main a { text-decoration: none; color: var(--ink-soft); font-size: 14px; letter-spacing: .02em; padding: 6px 0; border-bottom: 1px solid transparent; }
nav.main a:hover { color: var(--ink); }
nav.main a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }
.menu-btn { display: none; background: none; border: 0; padding: 8px 0; color: var(--ink); font: inherit; font-size: 14px; letter-spacing: .02em; }
@media (max-width: 720px) {
  .menu-btn { display: inline-block; }
  header.site .wrap { flex-wrap: wrap; min-height: 72px; }
  nav.main { display: none; width: 100%; flex-direction: column; gap: 4px; padding: 8px 0 24px; }
  nav.main.open { display: flex; }
  nav.main a { font-size: 22px; font-weight: 300; padding: 8px 0; align-self: flex-start; }
}

/* Type */
section { padding: var(--space-section) 0; }
section + section { border-top: 1px solid var(--line); }
section.hero { padding-top: clamp(48px, 7vw, 96px); }
/* Soft accent glow behind the hero — the only decorative colour on the page. */
section.hero { background: radial-gradient(ellipse 42% 50% at 86% 50%, var(--glow), transparent); }
section.band { background: var(--surface-2); }
section.band + section, section + section.band { border-top: 0; }
h1 { font-size: clamp(2.5rem, 6.4vw, 4.75rem); line-height: 1.04; letter-spacing: -0.035em; font-weight: 300; margin: 0 0 32px; max-width: 18ch; }
h1 em, h2 em { font-style: normal; color: var(--ink-soft); }
h2 { font-size: clamp(1.75rem, 3.6vw, 2.6rem); line-height: 1.12; letter-spacing: -0.025em; font-weight: 300; margin: 0 0 24px; }
h3 { font-size: 1.15rem; font-weight: 500; letter-spacing: -0.01em; margin: 0 0 8px; }
p { margin: 0 0 1em; }
.lead { font-size: clamp(1.1rem, 1.8vw, 1.3rem); line-height: 1.6; color: var(--ink-muted); max-width: 32em; font-weight: 300; }
.eyebrow { display: flex; align-items: center; gap: 12px; text-transform: uppercase; letter-spacing: .22em; font-size: 11px; font-weight: 500; color: var(--ink-soft); margin-bottom: 32px; }
.eyebrow::before { content: ""; width: 4px; height: 4px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }
.quiet { font-size: 14px; color: var(--ink-soft); }

/* Buttons and arrow links */
.actions { display: flex; gap: 32px; flex-wrap: wrap; align-items: center; margin-top: 48px; }
.btn { display: inline-block; padding: 15px 30px; border-radius: var(--radius); text-decoration: none; font-weight: 500; font-size: 15px; letter-spacing: .01em; border: 1px solid transparent; transition: background .2s, border-color .2s, color .2s; font-family: inherit; cursor: pointer; }
.btn.primary { background: var(--ink); color: var(--surface); }
.btn.primary:hover { background: var(--accent); color: var(--on-accent); }
.btn.ghost { border-color: var(--line); color: var(--ink); }
.btn.ghost:hover { border-color: var(--ink); }
.arrow { text-decoration: none; font-size: 15px; font-weight: 500; color: var(--ink); white-space: nowrap; }
.arrow::after { content: " →"; color: var(--accent); }
.arrow:hover { color: var(--accent-deep); }

/* Numbered rows (products, beliefs) */
.rows { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.row { display: grid; grid-template-columns: 72px minmax(0, 1fr) minmax(0, 1.4fr) 150px; gap: 24px; align-items: baseline; padding: 44px 0; border-bottom: 1px solid var(--line); }
.row .arrow { justify-self: end; }
.row .num { font-size: 13px; color: var(--ink-soft); letter-spacing: .1em; font-variant-numeric: tabular-nums; }
.row h3 { font-size: clamp(1.5rem, 2.6vw, 2rem); font-weight: 300; letter-spacing: -0.02em; margin: 0; }
.row p { color: var(--ink-muted); margin: 0; max-width: 32em; }
/* Second half of a product name ("Ari  Game Development Agent"). */
h2 .sub, h3 .sub { font-size: max(.5em, 14px); letter-spacing: 0; color: var(--ink-soft); white-space: nowrap; }
.row .tagline { display: block; font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--ink-soft); margin-top: 12px; font-weight: 500; }
.rows.plain .row { grid-template-columns: 72px minmax(0, 1fr) minmax(0, 1.4fr); }
@media (max-width: 820px) { .row, .rows.plain .row { grid-template-columns: 1fr; gap: 12px; padding: 36px 0; } .row .arrow { justify-self: start; } }

/* Numbers */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 48px; margin-top: 72px; }
.stat b { display: block; font-size: clamp(2.75rem, 6vw, 4.5rem); font-weight: 200; letter-spacing: -0.04em; line-height: 1; font-variant-numeric: tabular-nums; }
.stat span { display: block; margin-top: 16px; color: var(--ink-soft); font-size: 15px; max-width: 16em; }
@media (max-width: 720px) { .stats { grid-template-columns: 1fr; gap: 44px; } }

/* Split: heading column + content column */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 48px; }
.split > :first-child h2 { margin: 0; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; gap: 28px; } }

dl.facts { display: grid; grid-template-columns: max-content 1fr; gap: 0; margin: 0; border-top: 1px solid var(--line); }
dl.facts dt, dl.facts dd { padding: 18px 0; border-bottom: 1px solid var(--line); margin: 0; }
dl.facts dt { color: var(--ink-soft); font-size: 14px; letter-spacing: .02em; padding-right: 40px; }
@media (max-width: 560px) { dl.facts { grid-template-columns: 1fr; } dl.facts dt { border-bottom: 0; padding-bottom: 0; } dl.facts dd { padding-top: 4px; } }

.placeholder { background: var(--accent-light); color: var(--accent-deep); padding: 0 6px; border-radius: 4px; font-weight: 500; }
.prose { max-width: var(--measure); }
.prose h2 { font-size: 1.5rem; margin-top: 64px; }
.prose p, .prose li { color: var(--ink-muted); }

/* Form */
form.contact { display: grid; gap: 28px; max-width: 560px; }
form.contact label { display: block; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--ink-soft); }
form.contact input, form.contact select, form.contact textarea { width: 100%; padding: 12px 0; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; font: inherit; background: transparent; color: var(--ink); outline: none; transition: border-color .2s; }
form.contact input:focus, form.contact select:focus, form.contact textarea:focus { border-bottom-color: var(--ink); }
form.contact select option { background: var(--surface); color: var(--ink); }
form.contact textarea { min-height: 120px; resize: vertical; }
.form-msg { display: none; margin-top: 12px; color: var(--ink-muted); }
.form-msg.show { display: block; }

/* Footer */
footer.site { border-top: 1px solid var(--line); padding: 72px 0 40px; font-size: 14px; color: var(--ink-soft); }
footer.site .top { display: flex; justify-content: space-between; align-items: flex-start; gap: 40px; flex-wrap: wrap; }
footer.site nav { display: flex; gap: 28px; flex-wrap: wrap; }
footer.site nav a { text-decoration: none; }
footer.site nav a:hover { color: var(--ink); }
footer.site .legal { margin-top: 56px; font-size: 12px; line-height: 1.8; max-width: 60em; }
.spaced { margin-top: 56px; }
h1, h2 { text-wrap: balance; }

/* Hero: words left, a small picture of the two products right. */
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 56px; align-items: center; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 48px; } }
.hero-art { position: relative; display: grid; gap: 16px; max-width: 440px; justify-self: end; width: 100%; }
@media (max-width: 900px) { .hero-art { justify-self: start; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 22px 24px; box-shadow: var(--shadow); }
.card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--ink-soft); font-weight: 500; margin-bottom: 18px; }
.card-head b { display: block; color: var(--ink); font-weight: 500; letter-spacing: .02em; text-transform: none; font-size: 14px; }
.card-head small { display: block; margin-top: 2px; font-size: 13px; letter-spacing: 0; text-transform: none; font-weight: 400; color: var(--ink-soft); }
.hero-art .card:nth-child(2) { margin-left: 40px; margin-right: -12px; }
@media (max-width: 520px) { .hero-art .card:nth-child(2) { margin-left: 20px; margin-right: 0; } }
/* "Handwriting": short strokes standing in for a student's answer. */
.scribble { display: grid; gap: 10px; margin-bottom: 18px; }
.scribble i { display: block; height: 7px; border-radius: 4px; background: var(--line); }
.scribble i:nth-child(1) { width: 92%; } .scribble i:nth-child(2) { width: 78%; } .scribble i:nth-child(3) { width: 60%; }
.score { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 14px; color: var(--ink-muted); }
.score b { font-size: 26px; font-weight: 300; letter-spacing: -0.02em; color: var(--ink); }
.pill { display: inline-flex; align-items: center; gap: 8px; font-size: 12px; padding: 5px 12px; border-radius: 999px; background: var(--accent-light); color: var(--accent-deep); font-weight: 500; }
.pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.prompt { font-size: 15px; color: var(--ink); background: var(--surface-2); border-radius: 12px; padding: 12px 16px; margin-bottom: 14px; }
.prompt::before { content: "“"; color: var(--accent); }
.prompt::after { content: "”"; color: var(--accent); }
/* A tiny game board: rows of tiles, one of them the player. */
.board { display: grid; grid-template-columns: repeat(10, 1fr); gap: 4px; }
.board i { aspect-ratio: 1; border-radius: 3px; background: var(--line); }
.board i.on { background: var(--ink); opacity: .85; }
.board i.me { background: var(--accent); }

/* Products on home: rows lift slightly on hover. */
.rows .row { transition: background .25s, padding .25s; }
@media (hover: hover) and (min-width: 821px) { .rows .row:hover { background: var(--surface-2); padding-left: 16px; padding-right: 16px; } }

/* Numbers in a band, split by hairlines. */
.band .stats { gap: 0; margin-top: 56px; border-top: 1px solid var(--line); }
.band .stat { padding: 36px 32px 8px 0; }
.band .stat + .stat { padding-left: 32px; border-left: 1px solid var(--line); }
@media (max-width: 720px) { .band .stat, .band .stat + .stat { padding: 28px 0 8px; border-left: 0; } .band .stat + .stat { border-top: 1px solid var(--line); } }
.band-head { display: flex; justify-content: space-between; align-items: end; gap: 32px; flex-wrap: wrap; }
.band-head h2 { margin: 0; }
.band-head p { margin: 0; max-width: 26em; }

/* Closing call to action: one dark panel in both themes. */
.cta { background: var(--panel); color: var(--on-panel); border: 1px solid color-mix(in srgb, var(--on-panel) 8%, transparent); border-radius: 28px; padding: clamp(40px, 6vw, 72px); display: flex; justify-content: space-between; align-items: center; gap: 32px; flex-wrap: wrap; position: relative; overflow: hidden; }
.cta::after { content: ""; position: absolute; right: -120px; top: -160px; width: 420px; aspect-ratio: 1; background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 35%, transparent), transparent); pointer-events: none; }
.cta h2 { margin: 0; max-width: 16ch; color: inherit; }
.cta p { margin: 12px 0 0; opacity: .7; max-width: 28em; }
.cta .btn { background: var(--on-panel); color: var(--panel); position: relative; z-index: 1; }
.cta .btn:hover { background: var(--accent); color: var(--on-accent); }
section.cta-wrap { border-top: 0; }

/* Long two-column sections: keep the heading in view while the details scroll. */
@media (min-width: 821px) { .split > :first-child { position: sticky; top: 120px; align-self: start; } }