:root {
  --bg: #f5f6f4;
  --surface: #ffffff;
  --text: #1d2521;
  --text-muted: #66706b;
  --accent: #2f6b4f;
  --accent-light: #eaf2ed;
  --error: #c0392b;
  --border: #dde3df;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.page {
  max-width: 600px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-header {
  text-align: center;
  padding: 8px 0 4px;
}

.page-header.hero {
  background: var(--accent-light);
  border-radius: 16px;
  padding: 32px 20px;
}

.page-header h1 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.page-header p {
  margin: 0;
  color: var(--text-muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.card-tint {
  background: var(--accent-light);
}

.card h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
}

.step-label {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.section-description {
  margin: -8px 0 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.field-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.field-row[hidden] {
  display: none;
}

.field-row label {
  font-weight: 600;
  font-size: 0.9rem;
}

.field-help {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.field-row input,
.field-row select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  width: 100%;
}

.field-row input:focus,
.field-row select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.input-with-suffix {
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-with-suffix input {
  flex: 1;
}

.suffix {
  color: var(--text-muted);
}

.error-message {
  color: var(--error);
  font-size: 0.9rem;
  min-height: 1.2em;
  margin: 0 0 10px;
}

.target-grade-display {
  color: var(--text);
  font-weight: 600;
  margin: 0;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 1rem;
  cursor: pointer;
}

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

.btn-secondary {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  align-self: center;
}

.btn-delete {
  padding: 6px 12px;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.category-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.category-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.empty-message {
  color: var(--text-muted);
  margin: 0;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.result-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: center;
}

.result-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.result-value {
  font-size: 1.1rem;
  font-weight: 600;
}

.grade-needed {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.grade-needed-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.grade-needed-value {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--accent);
}

.grade-needed-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

@media (max-width: 480px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
}