:root {
  --page-bg: oklch(0.982 0.006 266);
  --surface: oklch(1 0 0);
  --surface-soft: oklch(0.965 0.008 266);
  --ink: oklch(0.19 0.02 264);
  --ink-secondary: oklch(0.42 0.025 264);
  --ink-muted: oklch(0.53 0.02 264);
  --line: oklch(0.89 0.012 264);
  --line-strong: oklch(0.77 0.02 264);
  --accent: oklch(0.56 0.25 270);
  --accent-strong: oklch(0.49 0.28 282);
  --success: oklch(0.52 0.16 156);
  --danger: oklch(0.57 0.21 27);
  --focus: oklch(0.64 0.22 270 / 0.28);
  --shadow: 0 20px 64px oklch(0.18 0.03 264 / 0.09);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page-bg: oklch(0.145 0.018 257);
    --surface: oklch(0.18 0.021 257);
    --surface-soft: oklch(0.225 0.024 257);
    --ink: oklch(0.94 0.012 257);
    --ink-secondary: oklch(0.75 0.025 257);
    --ink-muted: oklch(0.63 0.025 257);
    --line: oklch(0.30 0.025 257);
    --line-strong: oklch(0.42 0.035 257);
    --accent: oklch(0.68 0.23 270);
    --accent-strong: oklch(0.62 0.28 285);
    --success: oklch(0.69 0.16 156);
    --danger: oklch(0.69 0.19 25);
    --focus: oklch(0.68 0.23 270 / 0.3);
    --shadow: 0 24px 80px oklch(0.04 0.01 257 / 0.3);
    color-scheme: dark;
  }
}

html {
  background: var(--page-bg);
}

body {
  color: var(--ink);
  background: var(--page-bg);
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app {
  width: min(100%, 520px);
  padding: max(24px, env(safe-area-inset-top)) 24px max(24px, env(safe-area-inset-bottom));
}

.brand {
  height: 52px;
  margin-bottom: 24px;
  justify-content: flex-start;
}

.brand img {
  width: 92px;
}

.screen {
  margin: 0 0 auto;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: none;
}

.screen.hidden {
  display: none;
}

.merchant {
  margin: 0 0 24px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.015em;
}

.payment-method {
  min-height: 44px;
  margin: 0 0 28px;
  padding: 0 0 14px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-secondary);
  font-size: 13px;
  font-weight: 500;
}

.payment-method-name {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.payment-method-name img {
  width: 18px;
  height: 22px;
}

.amount-label {
  margin: 0 0 8px;
  color: var(--ink-secondary);
  font-size: 13px;
  font-weight: 500;
}

.amount-control {
  min-height: 80px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

.amount-control:focus-within {
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 4px var(--focus);
}

input {
  padding: 18px 92px 18px 20px;
  color: var(--ink);
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

input::placeholder {
  color: var(--ink-muted);
}

.currency {
  color: var(--ink-secondary);
  font-family: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 16px;
}

.limits {
  margin: 10px 1px 24px;
  color: var(--ink-muted);
  font-family: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}

button,
.bank-link {
  min-height: 56px;
  border-radius: 8px;
  background: linear-gradient(108deg, #0062ff 0%, #617eff 42%, #6817ff 72%, #9a00a2 100%);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  box-shadow: none;
  transition: transform 120ms ease, filter 120ms ease, opacity 120ms ease;
}

button:hover,
.bank-link:hover {
  filter: brightness(1.05);
}

button:active,
.bank-link:active {
  transform: translateY(1px);
}

button:focus-visible,
.bank-link:focus-visible,
input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.secondary {
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
}

.secondary:hover {
  border-color: var(--ink-muted);
  background: var(--surface-soft);
  color: var(--ink);
  filter: none;
}

.error {
  margin: 14px 2px 0;
  color: var(--danger);
  font-size: 14px;
  line-height: 1.45;
}

.loading-block {
  padding: 4px 0;
}

.loading-line {
  background: var(--surface-soft);
}

.loading-line::after,
.qr-placeholder::after {
  background: linear-gradient(90deg, transparent, color-mix(in oklch, var(--ink) 8%, transparent), transparent);
}

.result-head {
  margin-bottom: 24px;
  align-items: flex-end;
  text-align: left;
}

.result-merchant {
  margin-bottom: 5px;
  color: var(--ink-secondary);
  font-size: 13px;
  font-weight: 500;
}

.result-amount {
  color: var(--ink);
  font-family: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.result-method {
  min-height: auto;
  margin: 0 0 3px;
  padding: 0;
  border: 0;
}

.result-method .payment-method-name {
  font-size: 18px;
}

.result-method .payment-method-name img {
  width: 23px;
  height: 29px;
}

.qr-frame {
  width: min(100%, 304px);
  margin: 0 auto;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.qr,
.qr-placeholder {
  border-radius: 4px;
}

.payment-status {
  margin: 18px 0;
}

.status-title {
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
}

.status-help,
.payment-expiry {
  color: var(--ink-secondary);
  font-size: 12px;
}

.payment-expiry {
  min-height: 18px;
  margin: 8px 0 0;
  font-family: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.payment-expiry.expired {
  color: var(--danger);
}

.status-line {
  width: 100%;
  height: 2px;
  margin: 14px 0 0;
  background: var(--line);
}

.status-line::after {
  width: 56px;
  background: var(--accent);
}

.state {
  min-height: 400px;
  align-items: flex-start;
  justify-content: center;
  text-align: left;
}

.state-mark,
.state-mark.error-mark {
  width: 52px;
  height: 52px;
  margin-bottom: 24px;
  display: grid;
  place-items: center;
  border: 1px solid color-mix(in oklch, var(--success) 44%, var(--line));
  border-radius: 50%;
  background: color-mix(in oklch, var(--success) 9%, var(--surface));
  color: var(--success);
  font-size: 28px;
  animation: none;
}

.state-mark.error-mark {
  border-color: color-mix(in oklch, var(--danger) 44%, var(--line));
  background: color-mix(in oklch, var(--danger) 8%, var(--surface));
  color: var(--danger);
  font-size: 25px;
}

.state-title {
  color: var(--ink);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.state-amount {
  margin-top: 10px;
  color: var(--ink);
  font-family: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 22px;
  font-weight: 500;
}

.state-help {
  margin: 8px 0 26px;
  color: var(--ink-secondary);
}

.state .secondary {
  max-width: none;
  margin-top: 28px;
}

.powered {
  min-height: 64px;
  padding: 18px 4px 0;
  color: var(--ink-muted);
  font-size: 11px;
}

.powered img {
  width: 17px;
  height: 17px;
}

.powered strong {
  color: var(--ink-secondary);
  font-size: 11px;
  font-weight: 600;
}

@media (max-width: 520px) {
  .app {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand {
    height: 44px;
    margin-bottom: 18px;
  }

  .brand img {
    width: 82px;
  }

  .screen {
    padding: 24px 20px;
    border-radius: 12px;
  }

  input {
    font-size: 34px;
  }

  .result-head {
    gap: 16px;
  }

  .result-method .payment-method-name {
    font-size: 16px;
  }

  .result-method .payment-method-name img {
    width: 20px;
    height: 25px;
  }

  .qr-frame {
    width: min(100%, 280px);
  }
}

@media (max-height: 720px) and (min-width: 521px) {
  .app {
    padding-top: 16px;
    padding-bottom: 16px;
  }

  .brand {
    margin-bottom: 14px;
  }

  .screen {
    padding-top: 24px;
    padding-bottom: 24px;
  }

  .qr-frame {
    width: 238px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }
}