:root {
  --primary: #00b557;
  --primary-dark: #00964a;
  --bg: #f0f0f0;
  --card: #ffffff;
  --text: #212121;
  --muted: #666666;
  --border: #dddddd;
  --danger: #ff3b30;
  --danger-bg: #fff2f1;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

.page {
  width: 100%;
  max-width: 28rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
}

.brand {
  text-align: center;
  margin-bottom: 1.25rem;
}

.brand-name {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.brand-tag {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.card h1 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
  line-height: 1.25;
}

.card h2 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1.05rem;
}

.card p,
.card li {
  color: var(--text);
}

.card ul,
.card ol {
  margin: 0.35rem 0 0;
  padding-left: 1.25rem;
}

.steps-list li + li {
  margin-top: 0.35rem;
}

.hidden {
  display: none !important;
}

.warning {
  margin: 1rem 0;
  padding: 0.85rem 0.9rem;
  border-radius: var(--radius);
  background: var(--danger-bg);
  border: 1px solid #ffc5c1;
  color: #8a1f18;
  font-size: 0.95rem;
}

.warning-strong {
  font-weight: 600;
}

label {
  display: block;
  margin: 0.85rem 0 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
}

input {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  color: var(--text);
  background: #fff;
}

input:focus {
  outline: 2px solid rgba(0, 181, 87, 0.35);
  border-color: var(--primary);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

.btn {
  appearance: none;
  border: none;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  flex: 1 1 auto;
  min-height: 2.75rem;
}

.actions-center {
  display: flex;
  justify-content: center;
  margin-top: 0.25rem;
}

.actions-center .btn {
  flex: 0 1 auto;
  min-width: 12rem;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
}

.btn-secondary {
  background: #e8e8e8;
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover:not(:disabled) {
  background: #e03228;
}

.error {
  margin: 0.6rem 0 0;
  color: var(--danger);
  font-size: 0.9rem;
}

.footer-note {
  margin: 1.5rem 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
}

.loading {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.72);
  z-index: 20;
  font-weight: 600;
  color: var(--text);
}

@media (min-width: 768px) {
  .page {
    max-width: 36rem;
    padding: 2.5rem 1.5rem 3rem;
  }

  .card {
    padding: 1.75rem;
  }

  .brand-name {
    font-size: 2rem;
  }

  .card h1 {
    font-size: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .page {
    max-width: 40rem;
  }
}