:root {
  --bg: #0f1217;
  --panel: #171c24;
  --card: #1f2633;
  --accent: #4db6ac;
  --muted: #aeb7c6;
  --text: #e6edf3;
  --danger: #ff6b6b;
  --border: #252d3a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem;
}

.layout {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-header {
  background: linear-gradient(120deg, rgba(77, 182, 172, 0.08), rgba(77, 182, 172, 0.02));
  border-bottom: 1px solid var(--border);
}

.lead {
  color: var(--muted);
  margin-top: 0.25rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

h1, h2, h3 {
  margin: 0 0 0.5rem 0;
  font-weight: 700;
}

p {
  margin-top: 0;
}

.eyebrow {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 0.15rem 0;
}

.small {
  font-size: 0.9rem;
}

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

.fieldset {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 0.75rem;
  background: var(--panel);
}

.fieldset-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

label {
  font-weight: 600;
  color: var(--muted);
}

select,
button,
input[type="checkbox"],
input[type="number"],
input[type="text"],
textarea {
  font: inherit;
}

select {
  padding: 0.75rem 0.85rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  width: 100%;
}

input[type="text"],
input[type="number"],
textarea {
  padding: 0.75rem 0.85rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  width: 100%;
}

textarea {
  resize: vertical;
}

.primary-btn {
  margin-top: 0.75rem;
  padding: 0.95rem 1rem;
  background: var(--accent);
  color: #0c1418;
  border: none;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  transition: transform 0.1s ease, box-shadow 0.2s ease;
}

.primary-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(77, 182, 172, 0.25);
}

.secondary-btn {
  padding: 0.8rem 1rem;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
}

.ghost-btn {
  background: transparent;
  color: var(--accent);
  border: 1px solid rgba(77, 182, 172, 0.4);
  padding: 0.55rem 0.75rem;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
}

.sensor-checkboxes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}

.sensor-checkboxes label {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.6rem 0.7rem;
  border-radius: 8px;
}

.error-banner {
  display: none;
  background: rgba(255, 107, 107, 0.1);
  color: var(--danger);
  border: 1px solid rgba(255, 107, 107, 0.4);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  margin-bottom: 0.75rem;
}

.rf-chains {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.rf-chain-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.5rem;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.6rem;
  border-radius: 10px;
}

.rf-chain-row .remove-btn {
  background: rgba(255, 107, 107, 0.12);
  border: 1px solid rgba(255, 107, 107, 0.4);
  color: var(--danger);
  padding: 0.45rem 0.7rem;
  border-radius: 10px;
  cursor: pointer;
}

.result-line {
  margin: 0.25rem 0;
}

.result-section {
  margin-top: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
}

.result-list {
  padding-left: 1.25rem;
  color: var(--muted);
}

.result-label {
  color: var(--muted);
  font-weight: 600;
}

.warning-note {
  margin-top: 0.5rem;
  padding: 0.65rem 0.75rem;
  border-radius: 10px;
  background: rgba(255, 193, 7, 0.12);
  border: 1px solid rgba(255, 193, 7, 0.4);
  color: #f2d480;
}

.summary-bar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  background: linear-gradient(135deg, rgba(77, 182, 172, 0.16), rgba(77, 182, 172, 0.08));
  border: 1px solid rgba(77, 182, 172, 0.35);
  border-radius: 12px;
  padding: 0.85rem;
  margin-bottom: 0.75rem;
}

.summary-block .summary-label {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.summary-block .summary-value {
  font-size: 1.25rem;
  font-weight: 800;
}

.env-grid,
.constraints-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.button-stack {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.5rem;
}

.file-btn input[type="file"] {
  display: none;
}

.role-checkboxes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.5rem;
}

.role-checkboxes label {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
}

.stacked-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.designs-list {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  padding: 0.75rem;
}

.design-entry {
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 0;
}

.design-entry:last-child {
  border-bottom: none;
}

.design-entry h4 {
  margin: 0 0 0.15rem 0;
}

.design-entry .tag {
  display: inline-block;
  background: rgba(77, 182, 172, 0.14);
  color: var(--text);
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  font-size: 0.8rem;
  margin-right: 0.3rem;
  border: 1px solid rgba(77, 182, 172, 0.45);
}

.design-entry .meta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

.design-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.design-action-buttons {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.design-entry .delete-btn {
  background: rgba(255, 107, 107, 0.12);
  border: 1px solid rgba(255, 107, 107, 0.4);
  color: var(--danger);
  padding: 0.35rem 0.55rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
}

.inline-note {
  font-size: 0.9rem;
  color: var(--muted);
}

@media (min-width: 720px) {
  .layout {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    gap: 1.25rem;
    align-items: start;
  }

  .primary-btn {
    width: auto;
  }

  .rf-chain-row {
    grid-template-columns: 1fr 1fr auto;
  }

  .summary-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .env-grid,
  .constraints-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}