/* Genconstruct's own pages in the chat (join, plans), in Gencloud's palette as in brand/theme.json.
 * The landing page is a static site in the landing-sites repo (genconstruct-site/). */
:root {
  --bg: 246 249 253; --bg-alt: 238 244 251; --card: 255 255 255;
  --ink: 16 28 46; --ink-2: 52 66 88; --muted: 91 107 130;
  --line: 220 231 245; --accent: 107 116 196; --accent-hover: 88 96 176; --sky: 116 200 242;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: 9 13 21; --bg-alt: 13 18 29; --card: 21 27 40;
    --ink: 233 241 251; --ink-2: 200 212 228; --muted: 147 164 188;
    --line: 30 40 58; --accent: 128 137 214; --accent-hover: 150 158 226; --sky: 116 200 242;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: rgb(var(--bg)); color: rgb(var(--ink));
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 999px;
  font-weight: 600; text-decoration: none; transition: background .15s, transform .15s, border-color .15s;
}
.btn-primary { background: rgb(var(--accent)); color: #fff; box-shadow: 0 8px 24px -10px rgb(var(--accent) / .7); }
.btn-primary:hover { background: rgb(var(--accent-hover)); transform: translateY(-1px); }
.btn-ghost { border: 1px solid rgb(var(--line)); color: rgb(var(--ink)); }
.btn-ghost:hover { border-color: rgb(var(--accent)); }

/* Header */
header { position: sticky; top: 0; z-index: 10; backdrop-filter: blur(12px); background: rgb(var(--bg) / .8); border-bottom: 1px solid rgb(var(--line) / .6); }
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; text-decoration: none; }
.brand img { width: 34px; height: 34px; }
nav { display: flex; align-items: center; gap: 28px; }
nav a.link { text-decoration: none; color: rgb(var(--ink-2)); font-size: 15px; }
nav a.link:hover { color: rgb(var(--ink)); }
nav .btn { padding: 9px 18px; font-size: 15px; }
@media (max-width: 720px) { nav a.link { display: none; } }

.checks { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 12px; }
.checks li { display: flex; gap: 12px; align-items: flex-start; }
.checks li::before {
  content: "✓"; flex: none; display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%;
  font-size: 13px; font-weight: 700; color: #fff; background: linear-gradient(135deg, rgb(var(--sky)), rgb(var(--accent)));
}

.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; max-width: 880px; margin: 0 auto; }
@media (max-width: 760px) { .plans { grid-template-columns: 1fr; } }
.plan { position: relative; padding: 32px; border-radius: 20px; background: rgb(var(--card)); border: 1px solid rgb(var(--line)); display: flex; flex-direction: column; }
.plan h3 { margin: 0 0 4px; font-size: 20px; }
.plan .sub { color: rgb(var(--muted)); font-size: 14.5px; margin: 0 0 18px; }
.price { font-size: 44px; font-weight: 800; letter-spacing: -0.02em; line-height: 1; }
.price small { font-size: 15px; font-weight: 500; color: rgb(var(--muted)); letter-spacing: 0; }
.plan .checks { margin: 24px 0 28px; flex: 1; font-size: 15px; }
.plan .btn { justify-content: center; }

footer { padding: 32px 0 48px; color: rgb(var(--muted)); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
footer a { text-decoration: none; }
footer a:hover { color: rgb(var(--ink)); }

/* Join and plans: one card under the header, as GenCollege's Join. */
.page { min-height: calc(100vh - 68px); padding: 64px 0 80px; position: relative; overflow: hidden; }
.page::before {
  content: ""; position: absolute; inset: -30% -10% auto; height: 90%; z-index: -1;
  background: radial-gradient(closest-side, rgb(var(--sky) / .18), transparent 70%) 20% 30% / 60% 60% no-repeat,
              radial-gradient(closest-side, rgb(var(--accent) / .18), transparent 70%) 80% 20% / 60% 60% no-repeat;
}
.card { max-width: 440px; margin: 0 auto; padding: 36px 32px; border-radius: 20px; background: rgb(var(--card)); border: 1px solid rgb(var(--line)); box-shadow: 0 30px 80px -40px rgb(16 28 46 / .35); }
.card.wide { max-width: 880px; }
.card h1 { font-size: 30px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 10px; }
.card .lead { color: rgb(var(--ink-2)); margin: 0 0 24px; }
.field { display: grid; gap: 6px; margin-bottom: 16px; }
.field span { font-size: 13px; font-weight: 600; color: rgb(var(--ink-2)); }
.field input {
  font: inherit; padding: 12px 14px; border-radius: 12px; border: 1px solid rgb(var(--line));
  background: rgb(var(--bg)); color: rgb(var(--ink));
}
.field input:focus { outline: 2px solid rgb(var(--sky)); outline-offset: 1px; }
.btn-block { width: 100%; justify-content: center; border: 0; cursor: pointer; font: inherit; font-weight: 600; }
button.btn { border: 0; cursor: pointer; font: inherit; font-weight: 600; }
button.btn-ghost { border: 1px solid rgb(var(--line)); background: transparent; }
.btn[disabled] { opacity: .6; cursor: default; transform: none; }
.notice { padding: 12px 14px; border-radius: 12px; font-size: 14.5px; margin-bottom: 16px; }
.notice-err { background: rgb(220 70 70 / .1); color: rgb(190 50 50); border: 1px solid rgb(220 70 70 / .3); }
.notice-ok { background: rgb(52 168 110 / .1); color: rgb(36 150 92); border: 1px solid rgb(52 168 110 / .3); }
.form-foot { text-align: center; color: rgb(var(--muted)); font-size: 14px; margin: 18px 0 0; }
.steps-mini { display: flex; gap: 8px; justify-content: center; margin-bottom: 22px; font-size: 13px; color: rgb(var(--muted)); }
.steps-mini b { color: rgb(var(--accent)); }

.choice { display: block; cursor: pointer; }
.choice input { position: absolute; opacity: 0; pointer-events: none; }
.choice .plan { height: 100%; transition: border-color .15s, box-shadow .15s; }
.choice input:checked + .plan { border: 2px solid rgb(var(--accent)); box-shadow: 0 24px 60px -30px rgb(var(--accent) / .6); }
.choice input:focus-visible + .plan { outline: 2px solid rgb(var(--sky)); outline-offset: 2px; }
.addon { display: flex; gap: 14px; align-items: flex-start; padding: 18px 20px; border-radius: 16px; border: 1px solid rgb(var(--line)); background: rgb(var(--card)); cursor: pointer; margin-top: 12px; }
.addon input { margin-top: 4px; width: 18px; height: 18px; accent-color: rgb(var(--accent)); }
.addon div { flex: 1; }
.addon small { display: block; color: rgb(var(--muted)); }
.summary { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 24px; padding-top: 20px; border-top: 1px solid rgb(var(--line)); }
.summary .total { font-size: 15px; color: rgb(var(--ink-2)); }
.summary .total b { font-size: 20px; color: rgb(var(--ink)); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.muted { color: rgb(var(--muted)); }
[hidden] { display: none !important; }