:root {
  --bg: #f4f6f8;
  --card: #fff;
  --text: #1a1f2e;
  --muted: #5c6578;
  --primary: #1b6b4a;
  --primary-hover: #145a3d;
  --danger: #b42318;
  --danger-hover: #912018;
  --border: #d8dee8;
  --replaced: #ffcccc;
  --new: #ccffcc;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

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

.header {
  background: var(--primary);
  color: #fff;
  padding: 1.25rem 2rem;
}

.header h1 {
  margin: 0;
  font-size: 1.5rem;
}

.hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.35rem 0 0.75rem;
}

.subtitle {
  margin: 0.25rem 0 0;
  opacity: 0.9;
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
}

.sidebar {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow);
  height: fit-content;
  position: sticky;
  top: 1rem;
}

.sidebar h2,
.sidebar h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.nutrient-modes label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.check {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.main {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.tab {
  border: 1px solid var(--border);
  background: var(--bg);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
}

.tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.panel {
  display: none;
}

.panel.active {
  display: block;
}

.input {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.input.narrow {
  width: 6rem;
}

.field {
  display: block;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.add-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1rem;
}

.add-row .input {
  flex: 1;
  min-width: 140px;
  margin-bottom: 0;
}

.btn {
  border: 1px solid var(--border);
  background: var(--bg);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
}

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

.btn.primary:hover {
  background: var(--primary-hover);
}

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

.btn.danger:hover {
  background: var(--danger-hover);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.table th,
.table td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.6rem;
  text-align: left;
}

.table th {
  background: #eef1f6;
}

tr.row-replaced td {
  background: var(--replaced);
}

tr.row-new td {
  background: var(--new);
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.result {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--border);
}

.hidden {
  display: none !important;
}

.summary {
  font-size: 1rem;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1rem 0;
}

.metric {
  background: var(--bg);
  border-radius: 8px;
  padding: 0.75rem 1rem;
}

.metric strong {
  display: block;
  font-size: 1.25rem;
}

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.legend {
  font-size: 0.85rem;
  color: var(--muted);
}

.feedback {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.msg,
.error {
  width: 100%;
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
}

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

.msg.ok {
  color: var(--primary);
}

.msg.warn {
  color: #b54708;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .compare {
    grid-template-columns: 1fr;
  }
  .metrics {
    grid-template-columns: 1fr;
  }
}