* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: clamp(12px, 4vw, 32px);
  min-height: 100vh;
  -webkit-text-size-adjust: 100%;
}
.card {
  width: 100%;
  max-width: 440px;
  background: #1e293b;
  border-radius: 18px;
  padding: clamp(16px, 5vw, 28px);
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
}
.head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
h1 { font-size: 22px; margin: 0; }
.badge {
  font-size: 11px; padding: 3px 9px; border-radius: 999px;
  background: #334155; color: #94a3b8; text-transform: uppercase; letter-spacing: .5px;
}
.badge.mock { background: #422006; color: #fbbf24; }
.badge.live { background: #052e16; color: #4ade80; }

form { display: flex; flex-direction: column; gap: 14px; }
label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: #94a3b8; }
input, select {
  background: #0f172a; border: 1px solid #334155; color: #e2e8f0;
  border-radius: 10px; padding: 12px; font-size: 15px; outline: none;
}
input:focus, select:focus { border-color: #6366f1; }

button { cursor: pointer; font-size: 15px; border: none; border-radius: 10px; }
#submit, .primary-btn {
  background: #6366f1; color: #fff; padding: 14px; font-weight: 600; margin-top: 4px;
  text-align: center; text-decoration: none; display: block;
}
#submit:hover, .primary-btn:hover { background: #4f46e5; }

.hidden { display: none !important; }
.error { margin-top: 14px; background: #450a0a; color: #fca5a5; padding: 12px; border-radius: 10px; font-size: 14px; }
.loading { margin-top: 14px; color: #94a3b8; font-size: 14px; text-align: center; }

.result { margin-top: 8px; }
.amount-box { text-align: center; padding: 18px 0; }
.amount-label { font-size: 12px; color: #94a3b8; text-transform: uppercase; letter-spacing: .5px; }
.amount-value { font-size: clamp(28px, 9vw, 36px); font-weight: 700; margin-top: 4px; }

.req { background: #0f172a; border-radius: 12px; padding: 6px 14px; margin: 14px 0; }
.req-row { display: flex; align-items: center; gap: 10px; padding: 11px 0; border-bottom: 1px solid #1e293b; }
.req-row:last-child { border-bottom: none; }
.req-label { font-size: 12px; color: #94a3b8; width: 78px; flex-shrink: 0; }
.req-value { flex: 1; min-width: 0; font-size: 15px; font-family: "SF Mono", Menlo, monospace; word-break: break-word; }
.copy { background: #334155; color: #cbd5e1; padding: 6px 10px; font-size: 12px; }
.copy:hover { background: #475569; }
.copy.done { background: #052e16; color: #4ade80; }

.hint { font-size: 13px; color: #fbbf24; background: #422006; padding: 11px; border-radius: 10px; margin-top: 10px; }
.timer { text-align: center; font-size: 13px; color: #94a3b8; margin-top: 14px; }
.timer.expired { color: #fca5a5; }

.actions { display: flex; gap: 10px; margin-top: 16px; }
.ghost-btn { flex: 1; background: transparent; border: 1px solid #334155; color: #cbd5e1; padding: 11px; }
.ghost-btn:hover { background: #334155; }

.meta { margin-top: 16px; font-size: 11px; color: #64748b; display: flex; flex-direction: column; gap: 4px; }
.meta code { color: #94a3b8; word-break: break-all; }

/* Узкие экраны (компактные телефоны) — подпись над значением */
@media (max-width: 400px) {
  .req-row { flex-wrap: wrap; }
  .req-label { width: 100%; margin-bottom: 2px; }
  .req-value { font-size: 14px; }
  .copy { padding: 5px 8px; font-size: 11px; }
  .actions { flex-direction: column; }
  h1 { font-size: 20px; }
}

/* Большие экраны/десктоп — не растягиваем, держим карточку по центру */
@media (min-width: 600px) {
  body { align-items: center; }
}