:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #14213d;
  --muted: #5f6b7a;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #15803d;
  --warning: #a16207;
  --danger: #b91c1c;
  --border: #dbe3ef;
  --soft: #eef4ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #e8f0ff 0, var(--bg) 38rem);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell { width: min(100% - 24px, 560px); margin: 0 auto; padding: 22px 0 36px; }
.brand { display: flex; align-items: center; gap: 10px; margin: 0 4px 18px; font-weight: 800; font-size: 19px; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: white; background: var(--primary); border-radius: 10px; }
.card { padding: 26px; background: var(--card); border: 1px solid rgba(219,227,239,.9); border-radius: 22px; box-shadow: 0 18px 50px rgba(47,72,117,.12); }
.eyebrow { margin: 0 0 10px; color: var(--primary); font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(30px, 8vw, 42px); line-height: 1.08; letter-spacing: -.035em; }
h2 { margin: 0 0 12px; font-size: 25px; }
h3 { margin: 0 0 8px; font-size: 17px; }
p { color: var(--muted); line-height: 1.55; }
.lead { margin: 16px 0 20px; font-size: 17px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 20px 0 24px; }
.feature { padding: 13px 10px; background: #f8fafc; border: 1px solid var(--border); border-radius: 14px; text-align: center; font-size: 13px; color: var(--muted); }
.feature strong { display: block; color: var(--text); font-size: 15px; margin-bottom: 4px; }
label { display: block; margin: 16px 0 7px; font-size: 14px; font-weight: 700; }
input { width: 100%; min-height: 50px; padding: 13px 14px; border: 1px solid #b8c5d8; border-radius: 12px; background: white; color: var(--text); font: inherit; }
input:focus { outline: 3px solid rgba(37,99,235,.18); border-color: var(--primary); }
.button { display: inline-flex; align-items: center; justify-content: center; width: 100%; min-height: 52px; padding: 13px 18px; border: 0; border-radius: 13px; background: var(--primary); color: white; font: inherit; font-weight: 800; text-decoration: none; cursor: pointer; transition: .15s ease; }
.button:hover { background: var(--primary-dark); transform: translateY(-1px); }
.button:disabled { opacity: .58; cursor: wait; transform: none; }
.button.secondary { color: var(--primary); background: var(--soft); }
.button.success { background: var(--success); }
.stack { display: grid; gap: 12px; }
.price { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin: 18px 0; padding: 18px; background: var(--soft); border-radius: 16px; }
.price strong { font-size: 30px; letter-spacing: -.03em; }
.price span { color: var(--muted); font-size: 14px; text-align: right; }
.order-code { margin: 18px 0; padding: 16px; border: 1px dashed #93a8c7; border-radius: 14px; text-align: center; background: #fbfdff; }
.order-code small { display: block; color: var(--muted); margin-bottom: 5px; }
.order-code strong { font-size: 24px; letter-spacing: .1em; }
.payment-box { margin: 14px 0; padding: 16px; border: 1px solid var(--border); border-radius: 15px; }
.card-number { display: flex; gap: 8px; align-items: center; }
.card-number code { flex: 1; padding: 12px; background: #f3f6fa; border-radius: 10px; font-size: 16px; font-weight: 800; text-align: center; }
.mini { width: auto; min-height: 42px; padding: 8px 12px; }
.qr { display: block; width: min(230px, 100%); margin: 12px auto 0; border-radius: 12px; }
.notice { margin: 16px 0; padding: 14px 16px; border-radius: 13px; background: #f8fafc; border-left: 4px solid #94a3b8; color: var(--muted); line-height: 1.5; }
.notice.success { background: #f0fdf4; border-color: var(--success); }
.notice.warning { background: #fffbeb; border-color: var(--warning); }
.notice.danger { background: #fef2f2; border-color: var(--danger); }
.file-label { display: block; padding: 14px; border: 1px dashed #8295b2; border-radius: 12px; text-align: center; cursor: pointer; }
.file-label input { position: absolute; opacity: 0; pointer-events: none; }
.muted { color: var(--muted); font-size: 13px; }
.error { min-height: 20px; margin: 10px 0 0; color: var(--danger); font-size: 14px; }
.divider { height: 1px; margin: 22px 0; background: var(--border); }
details { margin-top: 16px; }
summary { cursor: pointer; font-weight: 700; }
footer { padding: 20px 4px 0; color: var(--muted); text-align: center; font-size: 13px; }
footer a { color: var(--primary); }

@media (max-width: 460px) {
  .shell { width: min(100% - 16px, 560px); padding-top: 12px; }
  .card { padding: 21px 17px; border-radius: 18px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature { display: flex; align-items: center; justify-content: space-between; text-align: left; }
  .feature strong { margin: 0; }
  .price { align-items: center; }
}