:root {
  --brand-primary: #0B5FFF;
  --brand-primary-ink: #0847c4;
  --brand-ink: #14181F;
  --brand-muted: #5B6472;
  --brand-line: #E4E8EF;
  --brand-bg: #F6F8FC;
  --brand-card: #FFFFFF;
  --brand-accent: #FFB200;
  --brand-good: #178A4C;

  --space-2xs: .375rem;
  --space-xs: .625rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.25rem;
  --space-xl: 3.25rem;
  --space-2xl: 4.5rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(20,24,31,.05), 0 8px 30px rgba(20,24,31,.08);
  --maxw: 1120px;
  --maxw-narrow: 720px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--brand-ink);
  background: var(--brand-bg);
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}
main { flex: 1 0 auto; }
img { max-width: 100%; height: auto; }
a { color: var(--brand-primary); }

h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.25rem); line-height: 1.1; letter-spacing: -.02em; margin: 0 0 var(--space-sm); }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.1rem); line-height: 1.15; letter-spacing: -.01em; margin: 0 0 var(--space-sm); }
p { margin: 0 0 var(--space-sm); }
.lead { font-size: clamp(1.05rem, 1rem + .5vw, 1.3rem); color: var(--brand-muted); }
.micro { font-size: .85rem; color: var(--brand-muted); }
.hint { color: var(--brand-muted); margin-top: calc(var(--space-xs) * -1); }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--space-md); }
.wrap.narrow { max-width: var(--maxw-narrow); }
.section { padding-block: var(--space-2xl); }

.site-header { background: var(--brand-card); border-bottom: 1px solid var(--brand-line); }
.site-header .wrap { display: flex; align-items: baseline; gap: var(--space-sm); padding-block: var(--space-sm); }
.brand { font-weight: 800; font-size: 1.35rem; letter-spacing: -.02em; text-decoration: none; color: var(--brand-ink); }
.brand-tag { color: var(--brand-muted); font-size: .9rem; }

.hero { text-align: center; }
.hero .lead { margin-bottom: var(--space-md); }
.hero .btn { margin-top: 0; }
.hero .micro { margin: var(--space-sm) 0 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font: inherit; font-weight: 650; cursor: pointer;
  border: 1px solid transparent; border-radius: 999px;
  padding: .72em 1.5em; transition: transform .06s ease, background .15s ease, box-shadow .15s ease;
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand-primary); color: #fff; }
.btn-primary:hover { background: var(--brand-primary-ink); }
.btn-ghost { background: transparent; color: var(--brand-ink); border-color: var(--brand-line); }
.btn-ghost:hover { background: var(--brand-card); }
.btn-lg { padding: .85em 1.9em; font-size: 1.05rem; }

.quiz-shell .wrap { background: var(--brand-card); border: 1px solid var(--brand-line); border-radius: var(--radius); box-shadow: var(--shadow); padding: var(--space-xl); }
.progress { height: 6px; background: var(--brand-line); border-radius: 999px; overflow: hidden; }
.progress-bar { height: 100%; width: 11%; background: var(--brand-primary); border-radius: 999px; transition: width .3s ease; }
.step-count { color: var(--brand-muted); font-size: .85rem; margin: var(--space-xs) 0 var(--space-md); }

.step { border: 0; padding: 0; margin: 0; display: none; }
.step.is-active { display: block; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.field-label { display: block; font-weight: 600; margin: var(--space-md) 0 var(--space-2xs); }
.control {
  width: 100%; font: inherit; color: var(--brand-ink);
  padding: .7em .85em; border: 1px solid var(--brand-line); border-radius: var(--radius-sm);
  background: #fff;
}
.control:focus { outline: 2px solid var(--brand-primary); outline-offset: 1px; border-color: var(--brand-primary); }
textarea.control { resize: vertical; }

.choice-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: var(--space-sm); margin-top: var(--space-sm); }
.choice {
  font: inherit; text-align: left; cursor: pointer;
  padding: var(--space-sm); border: 1.5px solid var(--brand-line); border-radius: var(--radius-sm);
  background: #fff; transition: border-color .12s ease, box-shadow .12s ease;
}
.choice:hover { border-color: var(--brand-primary); }
.choice.is-selected { border-color: var(--brand-primary); box-shadow: 0 0 0 3px rgba(11,95,255,.12); }
.swatch { position: relative; padding-left: 3.2rem; }
.swatch::before {
  content: ""; position: absolute; left: var(--space-sm); top: 50%; transform: translateY(-50%);
  width: 2rem; height: 1.1rem; border-radius: 4px;
  background: linear-gradient(90deg, var(--a) 0 33%, var(--b) 33% 66%, var(--c) 66% 100%);
}

.build-options { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); margin-top: var(--space-sm); }
.build-card {
  font: inherit; text-align: left; cursor: pointer; display: flex; flex-direction: column; gap: var(--space-2xs);
  padding: var(--space-md); border: 1.5px solid var(--brand-line); border-radius: var(--radius); background: #fff;
  position: relative; transition: border-color .12s ease, box-shadow .12s ease;
}
.build-card:hover { border-color: var(--brand-primary); }
.build-card.is-selected { border-color: var(--brand-primary); box-shadow: 0 0 0 3px rgba(11,95,255,.12); }
.build-name { font-weight: 700; font-size: 1.1rem; }
.build-price { font-weight: 700; color: var(--brand-primary); }
.build-desc { color: var(--brand-muted); font-size: .92rem; }
.build-badge { align-self: flex-start; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--brand-good); background: rgba(23,138,76,.1); padding: .2em .6em; border-radius: 999px; }
.build-sub { margin-top: var(--space-2xs); font-size: .9rem; color: var(--brand-muted); display: none; }
.build-card.is-selected .build-sub { display: block; }
.radio { display: flex; align-items: center; gap: .4em; margin-top: var(--space-2xs); }

.summary { background: var(--brand-bg); border: 1px solid var(--brand-line); border-radius: var(--radius-sm); padding: var(--space-sm); margin: var(--space-md) 0; font-size: .92rem; }
.summary dt { color: var(--brand-muted); }
.summary dd { margin: 0 0 var(--space-2xs); font-weight: 600; }
.check { display: flex; gap: .5em; align-items: flex-start; font-size: .92rem; margin-top: var(--space-sm); }

.notice { background: rgba(11,95,255,.06); border: 1px solid rgba(11,95,255,.22); border-radius: var(--radius-sm); padding: var(--space-md); margin: var(--space-md) 0; }
.notice-title { margin: 0 0 var(--space-xs); font-weight: 700; }
.notice ul { margin: 0; padding-left: 1.2em; }
.notice li { margin-bottom: var(--space-2xs); color: #2a2f38; }
.notice li:last-child { margin-bottom: 0; }

.pay-area { margin-top: var(--space-md); }

.nav { display: flex; justify-content: space-between; gap: var(--space-sm); margin-top: var(--space-lg); }
.nav .btn-primary { margin-left: auto; }

.field-error { color: #C81E1E; font-size: .85rem; margin-top: var(--space-2xs); }
.control.invalid { border-color: #C81E1E; }

.done { text-align: center; }

.site-footer { border-top: 1px solid var(--brand-line); background: var(--brand-card); }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: var(--space-sm); justify-content: space-between; align-items: center; padding-block: var(--space-md); color: var(--brand-muted); font-size: .9rem; }
.site-footer nav { display: flex; gap: var(--space-md); flex-wrap: wrap; }
.site-footer a { color: var(--brand-muted); text-decoration: none; }
.site-footer a:hover { color: var(--brand-ink); }

.legal { max-width: var(--maxw-narrow); }
.legal h1 { margin-bottom: var(--space-md); }
.legal h2 { font-size: 1.25rem; margin-top: var(--space-lg); }
.legal p, .legal li { color: #2a2f38; }
.legal .updated { color: var(--brand-muted); font-size: .9rem; }

@media (max-width: 620px) {
  .quiz-shell .wrap { padding: var(--space-md); }
  .build-options { grid-template-columns: 1fr; }
}