/* Kautuhal Lab. Whitebox's ink and grid, made round and bright for families. */
:root {
  --ink: #14161a;
  --paper: #ffffff;
  --body: #3a3f47;
  --muted: #4a5059;
  --on-ink-muted: #c9ced4;
  --grid-line: #eef0f3;
  --accent: #ff6a3d;
  --sun: #ffd23f;
  --sky: #7cc6fe;
  --error: #b3261e;
  --display: "Baloo Da 2", "Inter Tight", "Noto Sans Bengali", sans-serif;
  --sans: "Inter Tight", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; background-color: var(--paper); background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px); background-size: 28px 28px; color: var(--ink); font-family: var(--sans); font-size: 17px; line-height: 1.5; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-family: var(--display); line-height: 1; }
h2 { font-size: clamp(34px, 4vw, 52px); font-weight: 800; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: 1200px; margin-inline: auto; padding-inline: 24px; }

.site-header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-block: 20px; }
.brand { display: flex; align-items: center; gap: 12px; min-height: 44px; text-decoration: none; }
.brand svg { width: 38px; height: 38px; flex: none; }
.brand b { display: block; font: 800 24px/1 var(--display); letter-spacing: -0.01em; }
.brand small { display: block; margin-top: 2px; color: var(--muted); font-size: 12px; line-height: 1; }
.home-link { display: inline-flex; align-items: center; min-height: 44px; font: 500 13px/1.2 var(--mono); }

.hero { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); align-items: center; gap: 56px; padding-block: 40px 72px; }
.hero-copy { display: grid; gap: 24px; justify-items: start; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; font: 700 12px/1.3 var(--mono); letter-spacing: 0.06em; }
.pills span { padding: 5px 10px; border: 1.5px solid var(--ink); border-radius: 999px; background: var(--paper); }
.pills .hot { border-color: var(--accent); background: var(--accent); }
h1 { font-size: clamp(38px, 6vw, 72px); font-weight: 800; line-height: 0.98; letter-spacing: -0.02em; }
h1 span { display: inline-block; padding: 0 0.14em; border-radius: 0.18em; background: var(--sun); }
.lede { max-width: 540px; color: var(--body); font-size: 20px; }
.word { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.word [lang="bn"] { font: 700 34px/1.2 var(--display); }
.word span:last-child { color: var(--muted); font: 500 13px/1.3 var(--mono); }
.robot { justify-self: center; width: 100%; max-width: 330px; height: auto; }
.robot text { font: 700 18px var(--display); }

.waitlist { padding-bottom: 80px; }
.card { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); gap: 40px; padding: 36px; border: 3px solid var(--ink); border-radius: 28px; background: var(--paper); box-shadow: 10px 10px 0 var(--ink); }
.card-copy { display: grid; gap: 14px; align-content: start; }
.card-copy h2 { font-size: 40px; }
.card-copy p { color: var(--body); }
.card-copy .small { color: var(--muted); font-size: 15px; }

form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field label { font-size: 15px; font-weight: 600; }
.field label span { color: var(--muted); font-weight: 400; }
input[type="text"], select { width: 100%; min-height: 50px; padding: 0 14px; border: 2px solid var(--ink); border-radius: 12px; background: var(--paper); color: var(--ink); font: 400 16px var(--sans); }
input::placeholder { color: #6b727c; }
[aria-invalid="true"] { border-color: var(--error); }
.wide { grid-column: 1 / -1; }
.consent { display: flex; align-items: flex-start; gap: 12px; min-height: 44px; padding-block: 4px; color: var(--body); font-size: 15px; line-height: 1.45; cursor: pointer; }
.consent input { flex: none; width: 22px; height: 22px; margin: 0; accent-color: var(--ink); }
.error { color: var(--error); font-size: 14px; font-weight: 600; }
.notice { padding: 12px 14px; border: 2px solid var(--ink); border-radius: 12px; background: var(--sky); font-size: 15px; font-weight: 600; }
.submit { min-height: 56px; border: 0; border-radius: 14px; background: var(--ink); color: var(--paper); font: 700 20px var(--display); cursor: pointer; }
.submit:hover { background: #33373f; }
.submit:disabled { opacity: 0.6; cursor: wait; }
.privacy { color: var(--muted); font-size: 14px; }
.thanks { display: grid; align-content: center; gap: 12px; padding: 32px; border: 2px solid var(--ink); border-radius: 20px; background: var(--sun); }
.thanks strong { font: 800 32px/1 var(--display); }

.activities { padding-block: 24px 80px; }
.activities h2 { margin-bottom: 32px; }
.activity-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.activity { display: grid; gap: 10px; align-content: start; padding: 26px; border: 2.5px solid var(--ink); border-radius: 22px; background: var(--paper); }
.activity i { display: block; width: 44px; height: 44px; border: 2.5px solid var(--ink); border-radius: 12px; }
.activity:nth-child(1) i { background: var(--accent); }
.activity:nth-child(2) i { border-radius: 50%; background: var(--sky); }
.activity:nth-child(3) i { background: var(--sun); transform: rotate(45deg) scale(0.85); }
.activity:nth-child(4) i { border-style: dashed; border-radius: 50%; }
.activity h3 { font-size: 24px; font-weight: 700; line-height: 1.1; }
.activity p { color: var(--body); font-size: 16px; }

.parents { padding-bottom: 88px; }
.parents > div { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; padding: 40px; border-radius: 28px; background: var(--ink); color: var(--paper); }
.parents h3 { margin-bottom: 8px; font-size: 22px; font-weight: 700; }
.parents p { color: var(--on-ink-muted); font-size: 16px; }

.site-footer { border-top: 2px solid var(--ink); background: var(--paper); font-size: 14px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 4px 12px; padding-block: 12px; }
.site-footer strong a { display: inline-block; padding-block: 12px; }
.site-footer nav a { display: inline-flex; align-items: center; min-height: 44px; }

@media (max-width: 900px) {
  .hero, .card { grid-template-columns: minmax(0, 1fr); }
  h1 { font-size: clamp(38px, 9.8vw, 72px); }
  .activity-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 600px) {
  .wrap { padding-inline: 16px; }
  .hero { gap: 24px; padding-block: 16px 48px; }
  .lede { font-size: 18px; }
  .robot { max-width: 260px; }
  .card { gap: 24px; padding: 22px 18px; border-radius: 22px; box-shadow: 6px 6px 0 var(--ink); }
  form, .activity-grid, .parents > div { grid-template-columns: minmax(0, 1fr); }
  .parents > div { padding: 28px 22px; }
  .waitlist, .activities { padding-bottom: 56px; }
  .parents { padding-bottom: 56px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}