*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --green: #3fb950;
  --orange: #d29922;
  --red: #f85149;
  --radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 24px 16px;
}

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

header {
  text-align: center;
  margin-bottom: 32px;
}

header h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 6px;
}

header p {
  color: var(--text-dim);
  font-size: 14px;
}

.lang-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 14px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 13px;
  transition: border-color 0.2s;
}

.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* Screens */
.screen { display: none; }
.screen.active { display: block; }

/* Plan cards */
.plans {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.plan-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.1s;
}

.plan-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.plan-card.selected {
  border-color: var(--accent);
}

.plan-card h3 {
  font-size: 18px;
  margin-bottom: 4px;
}

.plan-card .desc {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 12px;
}

.plan-card .price {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
}

.plan-card .price span {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-dim);
}

.btn {
  display: block;
  width: 100%;
  padding: 14px;
  margin-top: 20px;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn:hover { background: var(--accent-hover); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Payment screen */
.payment-info {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 16px;
}

.payment-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.payment-row:last-child { border-bottom: none; }

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

.payment-row .value {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 14px;
  word-break: break-all;
  text-align: right;
  max-width: 260px;
}

.payment-row .value.amount {
  font-size: 20px;
  font-weight: 700;
  color: var(--green);
}

.qr-container {
  display: flex;
  justify-content: center;
  margin: 20px 0;
}

.qr-container canvas {
  border-radius: 8px;
}

.status-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
  color: var(--text-dim);
  font-size: 14px;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.timer {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 8px;
}

.timer.warn { color: var(--orange); }
.timer.urgent { color: var(--red); }

/* Config screen */
.config-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-top: 16px;
}

.url-box {
  display: flex;
  gap: 8px;
  margin: 12px 0;
}

.url-box input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-family: monospace;
  font-size: 13px;
}

.url-box button {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--accent);
  padding: 10px 16px;
  cursor: pointer;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color 0.2s;
}

.url-box button:hover { border-color: var(--accent); }

.steps {
  list-style: none;
  margin-top: 16px;
}

.steps li {
  padding: 8px 0;
  color: var(--text-dim);
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

.steps li:last-child { border-bottom: none; }

.app-links {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.app-links a {
  flex: 1;
  text-align: center;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
  transition: border-color 0.2s;
}

.app-links a:hover { border-color: var(--accent); }

.success-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #0d2818;
  border: 1px solid #238636;
  border-radius: var(--radius);
  padding: 14px;
  margin-top: 16px;
  color: var(--green);
  font-weight: 600;
}

.error-msg {
  background: #2d1214;
  border: 1px solid var(--red);
  border-radius: var(--radius);
  padding: 14px;
  margin-top: 16px;
  color: var(--red);
  font-size: 14px;
  text-align: center;
}

@media (max-width: 480px) {
  .payment-row { flex-direction: column; align-items: flex-start; gap: 4px; }
  .payment-row .value { text-align: left; max-width: 100%; }
}