:root {
  --bg-color: #f5f7fa;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --accent-color: #326ce5;
  --accent-color-hover: #2851a3;
  --text-color: #1a202c;
  --muted-text: #4a5568;
  --error-color: #e53e3e;
  --success-color: #2f855a;
  --input-bg: #f7fafc;
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.card {
  width: 100%;
  max-width: 720px;
  background-color: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
  padding: 20px 18px 22px;
}

.card-header {
  margin-bottom: 16px;
}

.card-title {
  margin: 0 0 4px;
  font-size: 1.4rem;
  font-weight: 600;
}

.card-subtitle {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted-text);
}

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

.field-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.field-row .field-group {
  flex: 1 1 0;
}

label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted-text);
}

input[type="number"] {
  width: 100%;
  padding: 9px 11px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--input-bg);
  font-size: 0.95rem;
  color: var(--text-color);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
  appearance: none;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 1px rgba(50, 108, 229, 0.3);
  background-color: #ffffff;
}

.hint {
  font-size: 0.8rem;
  color: var(--muted-text);
}

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.button {
  border: none;
  border-radius: 8px;
  background-color: var(--accent-color);
  color: #ffffff;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background-color 0.15s ease, box-shadow 0.15s ease, transform 0.05s ease;
}

.button:hover {
  background-color: var(--accent-color-hover);
  box-shadow: 0 8px 18px rgba(50, 108, 229, 0.35);
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
  box-shadow: none;
}

.button:disabled {
  background-color: #a0aec0;
  box-shadow: none;
  cursor: default;
  transform: none;
}

.button-icon {
  font-size: 1rem;
}

.message {
  font-size: 0.85rem;
}

.message.error {
  color: var(--error-color);
}

.message.success {
  color: var(--success-color);
}

@media (max-width: 600px) {
  .page {
    padding: 12px;
  }

  .card {
    padding: 16px 14px 18px;
    border-radius: 10px;
  }

  .card-title {
    font-size: 1.25rem;
  }

  .field-row {
    flex-direction: column;
  }

  .actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    justify-content: center;
    width: 100%;
  }
}