:root {
  color-scheme: light;
  --bg: #f6f7f8;
  --panel: #ffffff;
  --panel-soft: #f1f5f4;
  --text: #1d2523;
  --muted: #58645f;
  --border: #d8dedb;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --accent-soft: #d9f3ef;
  --focus: #b45309;
  --code: #26312e;
  --shadow: 0 12px 30px rgba(30, 45, 42, 0.08);
}

* {
  box-sizing: border-box;
}

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

a {
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  min-height: 2.35rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
  padding: 0.45rem 0.7rem;
}

button:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(180, 83, 9, 0.35);
  outline-offset: 2px;
}

.site-header {
  align-items: end;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 1.5rem;
  justify-content: space-between;
  padding: 1.5rem clamp(1rem, 3vw, 2rem);
}

.header-copy {
  max-width: 760px;
}

.header-copy h1 {
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1;
  margin: 0.25rem 0 0.65rem;
}

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

.header-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: flex-end;
}

.eyebrow {
  color: var(--accent-dark);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0;
  text-transform: uppercase;
}

.app-shell {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(260px, 0.85fr) minmax(280px, 0.9fr) minmax(420px, 1.45fr);
  padding: 1rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  min-width: 0;
}

.panel-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem;
}

.panel-header h2 {
  font-size: 1.15rem;
  line-height: 1.2;
  margin: 0.15rem 0 0;
}

.picker-panel,
.learning-panel,
.builder-panel {
  min-height: 70vh;
}

.artifact-picker {
  max-height: calc(100vh - 180px);
  overflow: auto;
  padding: 0.75rem;
}

.bucket-group + .bucket-group {
  margin-top: 1rem;
}

.bucket-title {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  margin: 0 0 0.45rem;
  text-transform: uppercase;
}

.artifact-option {
  border: 1px solid var(--border);
  border-radius: 8px;
  display: block;
  padding: 0.7rem;
  text-align: left;
  width: 100%;
}

.artifact-option + .artifact-option {
  margin-top: 0.45rem;
}

.artifact-option[aria-pressed="true"] {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.artifact-option strong {
  display: block;
  line-height: 1.25;
}

.artifact-option span {
  color: var(--muted);
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  margin-top: 0.25rem;
}

.learning-content {
  padding: 1rem;
}

.learning-content h3 {
  font-size: 1.45rem;
  line-height: 1.15;
  margin: 0 0 0.35rem;
}

.summary-text {
  color: var(--muted);
  margin: 0.5rem 0 1rem;
}

.meta-list {
  display: grid;
  gap: 0.4rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0 0 1rem;
}

.meta-item {
  background: var(--panel-soft);
  border-radius: 6px;
  padding: 0.6rem;
}

.meta-item dt {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
}

.meta-item dd {
  font-weight: 700;
  margin: 0.15rem 0 0;
}

.lifecycle-block {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  border-radius: 6px;
  margin: 0 0 1rem;
  padding: 0.75rem;
}

.lifecycle-block h4 {
  font-size: 0.95rem;
  margin: 0 0 0.35rem;
}

.lifecycle-block p {
  color: var(--muted);
  margin: 0;
}

.lifecycle-block p + p {
  margin-top: 0.5rem;
}

.runtime-warning {
  color: #7c2d12;
  font-weight: 700;
}

.info-block {
  border-top: 1px solid var(--border);
  padding: 0.9rem 0 0;
}

.info-block + .info-block {
  margin-top: 0.9rem;
}

.info-block h4 {
  font-size: 0.95rem;
  margin: 0 0 0.45rem;
}

.info-block ul {
  margin: 0;
  padding-left: 1.15rem;
}

.info-block li + li {
  margin-top: 0.35rem;
}

.builder-header {
  align-items: start;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
}

.control-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: flex-end;
}

.builder-grid {
  display: grid;
  gap: 0;
  grid-template-columns: minmax(260px, 0.95fr) minmax(300px, 1.05fr);
  min-height: calc(70vh - 90px);
}

.artifact-form {
  border-right: 1px solid var(--border);
  padding: 1rem;
}

.field-group + .field-group {
  margin-top: 1rem;
}

.field-label-row {
  align-items: baseline;
  display: flex;
  gap: 0.4rem;
  justify-content: space-between;
}

.field-label-row label {
  font-weight: 800;
}

.required-marker {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
}

.field-help {
  color: var(--muted);
  font-size: 0.86rem;
  margin: 0.25rem 0 0.4rem;
}

.field-group input,
.field-group select,
.field-group textarea,
.markdown-preview {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  display: block;
  width: 100%;
}

.field-group input,
.field-group select,
.field-group textarea {
  padding: 0.6rem;
}

.field-group textarea {
  min-height: 6.8rem;
  resize: vertical;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1rem;
}

.preview-heading-row {
  align-items: baseline;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
}

.preview-heading-row h3 {
  font-size: 1rem;
  margin: 0 0 0.65rem;
}

.control-status {
  color: var(--accent-dark);
  font-size: 0.88rem;
  font-weight: 700;
  min-height: 1.3rem;
  margin: 0;
}

.markdown-preview {
  color: var(--code);
  flex: 1;
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.55;
  min-height: 560px;
  padding: 0.85rem;
  resize: vertical;
  white-space: pre;
}

@media (max-width: 1180px) {
  .site-header,
  .builder-header {
    align-items: stretch;
    flex-direction: column;
  }

  .header-links,
  .control-row {
    justify-content: flex-start;
  }

  .app-shell {
    grid-template-columns: 1fr;
  }

  .picker-panel,
  .learning-panel,
  .builder-panel {
    min-height: 0;
  }

  .artifact-picker {
    max-height: none;
  }
}

@media (max-width: 760px) {
  .site-header {
    padding: 1rem;
  }

  .app-shell {
    padding: 0.5rem;
  }

  .builder-grid,
  .meta-list {
    grid-template-columns: 1fr;
  }

  .artifact-form {
    border-bottom: 1px solid var(--border);
    border-right: 0;
  }

  .control-row button {
    flex: 1 1 11rem;
  }
}