/* Минимальный клиент обмена RUB → BTC. Тёмная тема, одна карточка. */

:root {
  --bg: #0b0d10;
  --bg-elev: #14181d;
  --bg-elev2: #1b2026;
  --border: #262c33;
  --text: #e9edf1;
  --text-dim: #8b95a2;
  --text-mute: #5c6672;
  --accent: #f7931a;
  --accent-hover: #ffa534;
  --accent-text: #000;
  --error: #ef5b5b;
  --ok: #4ade80;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, system-ui, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

body {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 16px env(safe-area-inset-bottom);
}

.shell {
  width: 100%;
  max-width: 440px;
}

.hd {
  text-align: center;
  margin: 12px 0 20px;
}

.pair {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: var(--text-dim);
  text-transform: uppercase;
}

.rate {
  margin-top: 6px;
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
}

.view[hidden] { display: none; }

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* --- поле ввода --- */

.field { display: flex; flex-direction: column; gap: 6px; }

.field__label {
  font-size: 13px;
  color: var(--text-dim);
}

.field__row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-elev2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  transition: border-color .15s;
}

.field__row:focus-within {
  border-color: var(--accent);
}

.field__row input {
  flex: 1;
  background: transparent;
  border: 0;
  outline: 0;
  color: var(--text);
  font-size: 18px;
  font-weight: 500;
  font-family: inherit;
  min-width: 0;
}

.field__row input::placeholder { color: var(--text-mute); }

.field__suffix {
  font-size: 15px;
  color: var(--text-dim);
  font-weight: 500;
}

.arrow {
  text-align: center;
  color: var(--text-mute);
  font-size: 20px;
  margin: -4px 0;
  user-select: none;
}

/* --- кнопки --- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  border-radius: 10px;
  padding: 14px 18px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, color .15s, opacity .15s;
}

.btn[hidden] { display: none; }

.btn--primary {
  background: var(--accent);
  color: var(--accent-text);
}
.btn--primary:hover:not([disabled]) { background: var(--accent-hover); }
.btn--primary[disabled] { opacity: .4; cursor: not-allowed; }

.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn--ghost:hover { background: var(--bg-elev2); }

.btn--link {
  background: transparent;
  color: var(--accent);
  padding: 8px;
  font-size: 14px;
}

.btn--small {
  padding: 6px 10px;
  font-size: 13px;
}

.error {
  color: var(--error);
  font-size: 13px;
}

/* --- экран оплаты --- */

.order {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
}

.order__id {
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.3px;
}

.order__amounts {
  font-size: 20px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.order__sep { color: var(--text-mute); font-weight: 400; }

.order__status {
  margin-top: 8px;
  font-size: 15px;
  color: var(--text);
}

.order__status[data-status="completed"] { color: var(--ok); }
.order__status[data-status="cancelled"],
.order__status[data-status="expired"],
.order__status[data-status="payout_failed"] { color: var(--error); }

.order__timer {
  font-size: 13px;
  color: var(--text-dim);
}

.pay {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pay[hidden] { display: none; }

.pay__req {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-elev2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
}

.pay__row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 28px;
}

.pay__row[hidden] { display: none; }

.pay__k {
  flex: 0 0 42%;
  font-size: 13px;
  color: var(--text-dim);
}

.pay__v {
  flex: 1;
  font-size: 15px;
  color: var(--text);
  word-break: break-all;
}

.pay__v--mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
}

.pay__qr {
  display: block;
  width: 180px;
  height: 180px;
  margin: 0 auto;
  background: #fff;
  border-radius: 10px;
  padding: 8px;
  object-fit: contain;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

/* --- тост --- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--bg-elev2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
  z-index: 1000;
  max-width: calc(100vw - 32px);
}

.toast[hidden] { display: none; }

/* --- мобильная подгонка --- */

@media (max-width: 380px) {
  .pay__k { flex-basis: 40%; }
  .pay__v { font-size: 14px; }
  .pay__v--mono { font-size: 13px; }
}