:root {
  --accent: #6c4ee3;
  --accent-2: #17b2a0;
  --text: #1f2430;
  --muted: #6b7280;
  --card-bg: #ffffff;
  --error-bg: #fdecec;
  --error-text: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, #6c4ee3 0%, #17b2a0 100%);
  min-height: 100vh;
  color: var(--text);
}

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.hero {
  text-align: center;
  color: #fff;
  margin-bottom: 32px;
}


.hero h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.hero p {
  opacity: 0.9;
  margin: 0 0 12px;
}

.hero nav a {
  color: #fff;
  font-weight: 600;
  text-decoration: underline;
}

.card {
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  padding: 32px;
}

.field-group {
  margin-bottom: 28px;
}

.field-group h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--accent);
}

label {
  display: block;
  margin-bottom: 16px;
  font-weight: 600;
  font-size: 0.9rem;
}

label input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid #d8dce5;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 400;
  font-family: inherit;
}

label small {
  display: block;
  font-weight: 400;
  color: var(--muted);
  margin-top: 4px;
}

.budget-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px;
}

.budget-field {
  margin-bottom: 0;
  font-size: 0.85rem;
}

button[type="submit"] {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.2s ease;
}

button[type="submit"]:hover {
  transform: translateY(-1px);
}

button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.error-banner {
  background: var(--error-bg);
  color: var(--error-text);
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.error-banner.hidden {
  display: none;
}

footer {
  text-align: center;
  color: #fff;
  opacity: 0.85;
  margin-top: 24px;
  font-size: 0.85rem;
}

.guide h2 {
  color: var(--accent);
  margin-top: 28px;
}

.guide section:first-child h2 {
  margin-top: 0;
}

.guide dt {
  font-weight: 700;
  margin-top: 12px;
}

.guide dd {
  margin: 4px 0 0;
  color: var(--text);
}

.guide ul {
  padding-left: 20px;
}

.guide li {
  margin-bottom: 8px;
}

@media (max-width: 600px) {
  .page {
    padding: 28px 14px 56px;
  }

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

  .hero nav a {
    display: inline-block;
    padding: 6px 4px;
  }

  .card {
    padding: 20px;
    border-radius: 16px;
  }

  label input {
    font-size: 16px; /* prevents iOS Safari from zooming in on focus */
    padding: 12px;
  }

  .budget-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
}

@media (max-width: 360px) {
  .budget-grid {
    grid-template-columns: 1fr;
  }
}