:root {
  --color-bg: #f4f5f7;
  --color-card: #ffffff;
  --color-border: #e0e2e7;
  --color-primary: #1660d1;
  --color-primary-dark: #0f4aa8;
  --color-text: #202226;
  --color-muted: #6b7078;
  --color-red: #d81212;
  --color-green: #1a9c1a;
  --color-blue: #1660d1;
  --color-warning-bg: #fff4e5;
  --color-warning-border: #f0b429;
  --radius: 12px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

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

.app-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

.app-header h1 {
  font-size: 1.5rem;
  margin: 8px 0 4px;
}

.subtitle {
  color: var(--color-muted);
  margin: 0 0 20px;
  font-size: 0.95rem;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.card h2 {
  font-size: 1.1rem;
  margin: 0 0 14px;
}

.field-label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}

.shape-heading {
  display: flex;
  align-items: baseline;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 4px 12px;
  margin-bottom: 8px;
}

.shape-heading .field-label {
  margin-bottom: 0;
}

.shape-help-link {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}

.shape-help-link:hover {
  text-decoration: underline;
}

.select-input, input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: #fff;
  color: var(--color-text);
}

.select-small {
  width: auto;
  min-width: 70px;
  display: inline-block;
}

.select-input:focus, input[type="number"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(22,96,209,0.15);
}

.shape-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 4px;
}

@media (max-width: 560px) {
  .shape-grid { grid-template-columns: repeat(2, 1fr); }
}

.shape-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  padding: 10px 8px 12px;
  cursor: pointer;
  font-family: inherit;
  text-align: center;
  color: var(--color-text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.shape-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  background: #fff;
  border-radius: 6px;
  pointer-events: none;
}

.shape-card span {
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.25;
}

.shape-card:hover {
  border-color: var(--color-primary);
}

.shape-card.selected {
  border-color: var(--color-primary);
  background: #eef4ff;
  box-shadow: 0 0 0 2px rgba(22, 96, 209, 0.15);
}

.shape-grid.has-selection {
  display: none;
}

.btn-change-shape {
  display: block;
  width: 100%;
  background: none;
  border: none;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.1rem;
  font-family: inherit;
  cursor: pointer;
  padding: 4px 0 6px;
  text-align: center;
  text-decoration: underline;
}

.shape-display {
  margin-top: 18px;
}

.diagram-box {
  width: 100%;
  max-width: 500px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

.diagram-box img {
  width: 100%;
  height: 100%;
  display: block;
}

.shape-caption {
  text-align: center;
  margin-top: 12px;
}

.shape-naam {
  font-weight: 700;
  font-size: 1.05rem;
}

.shape-wiskundig {
  color: #4a4d53;
  font-style: italic;
  font-size: 15px;
  margin-top: 2px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--color-muted);
  margin: 14px 0 0;
  padding: 0;
}

.legend-item { display: inline-flex; align-items: center; gap: 6px; }

.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot-green { background: var(--color-green); }
.dot-red { background: var(--color-red); }
.dot-blue { background: var(--color-blue); }

.fields-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 10px;
}

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

.field label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.field.invalid input, .field.invalid select {
  border-color: var(--color-red);
  background: #fff6f6;
}

.fabric-toggle-block {
  margin: 18px 0 6px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
  width: 20px;
  height: 20px;
}

.hint-text {
  color: var(--color-muted);
  font-size: 0.88rem;
  margin: 4px 0 0 30px;
}

.hint-small { margin-left: 0; margin-top: 6px; }

.fabric-fields {
  margin-top: 14px;
  padding: 14px;
  background: #fafbfc;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.pattern-detail-fields {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

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

.pattern-direction-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.warnings {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: 8px;
  padding: 12px 14px;
  margin: 14px 0;
  font-size: 0.9rem;
}

.warnings ul { margin: 6px 0 0; padding-left: 20px; }

.btn-primary {
  display: block;
  width: 100%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 14px 18px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: 6px;
}

.btn-primary:hover { background: var(--color-primary-dark); }
.btn-primary:active { transform: translateY(1px); }

.result-card { border-left: 4px solid var(--color-primary); }

.result-values {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.result-label { color: var(--color-muted); margin-right: 6px; }

.result-number {
  font-weight: 700;
  font-size: 1.15rem;
}

.fabric-layout {
  margin: 4px 0 14px;
  padding: 12px 14px;
  background: #f6f8fb;
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.fabric-layout-intro {
  margin: 0 0 8px;
  font-weight: 600;
  font-size: 0.92rem;
}

.fabric-layout-list {
  margin: 0;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--color-text);
}

.fabric-layout-list li {
  margin-bottom: 6px;
}

.explanation summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--color-primary);
  padding: 6px 0;
}

.explanation ol {
  margin: 8px 0 0;
  padding-left: 20px;
  color: var(--color-text);
  font-size: 0.92rem;
}

.explanation li { margin-bottom: 6px; }

/* ============ "Welke vorm kies ik voor mijn kussen?" (onder de calculator) ============ */

#vormen-uitleg h2 {
  margin-bottom: 12px;
}

.uitleg-intro p {
  margin: 0 0 10px;
  font-size: 0.95rem;
}

.uitleg-intro p:last-child { margin-bottom: 0; }
.uitleg-intro strong { color: var(--color-primary); }

.inhoudsopgave {
  margin: 18px 0 22px;
}

.inhoudsopgave-vragen {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 8px;
}

.inhoudsopgave-vragen a {
  display: flex;
  align-items: center;
  text-decoration: none;
  font-weight: 600;
  padding: 0.6rem 0.9rem;
  min-height: 44px;
  line-height: 1.3;
  background: #f7f0e7;
  border: 1px solid #e0dcd6;
  border-radius: 8px;
  color: var(--color-text);
  font-size: 0.85rem;
  text-align: center;
  justify-content: center;
}

.inhoudsopgave-vragen a:hover {
  background: #efe6d8;
}

.uitleg-shape-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.uitleg-card {
  display: flex;
  gap: 16px;
  align-items: center;
  background: #fafbfc;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 14px;
  scroll-margin-top: 16px;
}

.uitleg-img-btn {
  flex: 0 0 auto;
  display: block;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 8px;
  background: none;
  cursor: pointer;
  line-height: 0;
}

.uitleg-img-btn:hover,
.uitleg-img-btn:focus-visible {
  border-color: var(--color-primary);
}

.uitleg-card img {
  width: 88px;
  height: 88px;
  object-fit: contain;
  background: #fff;
  border-radius: 7px;
  pointer-events: none;
}

.uitleg-bereken-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.uitleg-bereken-link:hover {
  text-decoration: underline;
}

.uitleg-card .txt h3 {
  margin: 0 0 2px;
  font-size: 1rem;
}

.uitleg-card .txt .officieel {
  font-size: 0.82rem;
  color: var(--color-muted);
  font-style: italic;
  margin: 0 0 6px;
}

.uitleg-card .txt p {
  margin: 0;
  font-size: 0.92rem;
}

.uitleg-rank {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #eef4ff;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 480px) {
  .uitleg-card { flex-wrap: wrap; }
  .uitleg-card img { width: 68px; height: 68px; }
}

.app-footer {
  text-align: center;
  color: var(--color-muted);
  font-size: 0.8rem;
  margin-top: 20px;
}