/**
 * Churn demo — cards, form, metrics (content chrome on top of layout-shell.css)
 */
:root {
  --accent: var(--main-color);
  --accent-hover: #e0ac06;
  --btn-text-on-accent: #1a1a1a;
  --radius-card: 4px;
  --success: #4caf50;
  --warning: #ffc107;
  --danger: #f44336;
  --font-mono: "Courier Prime", ui-monospace, monospace;
  --text-primary: var(--text-1);
  --text-secondary: var(--text-2);
  --text-muted: var(--text-3);
  --border-hairline: var(--border-soft);
  --content: var(--content-bg);
  --input-bg: rgb(25, 25, 35);
  --shadow-sm: var(--shadow-2);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--main-color);
  color: var(--btn-text-on-accent);
  font-weight: 600;
  z-index: 999999;
  border-radius: 4px;
  font-size: 14px;
}
.skip-link:focus {
  left: 0.5rem;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--main-color);
  outline-offset: 2px;
}

/* Sidebar: demo note block */
.art-info-bar .churn-demo-note {
  margin: 0;
  padding: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-2);
  font-weight: 300;
}
.art-info-bar .churn-demo-note strong {
  color: var(--text-1);
  font-weight: 600;
}

.art-info-bar .art-knowledge-list a {
  color: var(--main-color);
  font-weight: 600;
  text-decoration: none;
}
.art-info-bar .art-knowledge-list a:hover {
  text-decoration: underline;
}

/* Main column content */
.shell-content .page-title {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--text-1);
}
.shell-content .page-lead {
  font-size: 0.9rem;
  color: var(--text-2);
  margin: 0 0 1rem;
  max-width: 52ch;
  line-height: 1.55;
}
.shell-content .page-lead a {
  color: var(--main-color);
  font-weight: 600;
  text-decoration: none;
}
.shell-content .page-lead a:hover {
  text-decoration: underline;
  color: var(--accent-hover);
}

.demo-jump-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.85rem;
  align-items: center;
  margin: 0 0 1.35rem;
  padding: 0 0 1rem;
  border-bottom: 1px solid var(--border-soft);
}
.demo-jump-nav a {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.15s;
}
.demo-jump-nav a:hover {
  color: var(--main-color);
  text-shadow: var(--text-neon);
}

.shell-content {
  max-width: 900px;
}

.art-card {
  background: linear-gradient(159deg, var(--card-a) 0%, var(--card-b) 100%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.art-section-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-2);
  margin: 0 0 1rem;
}

.about-block p {
  color: var(--text-2);
  font-size: 0.88rem;
  margin: 0 0 0.75rem;
  line-height: 1.6;
}
.about-block p strong {
  color: var(--text-1);
}
.about-block ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--text-2);
  font-size: 0.85rem;
}
.about-block li {
  margin-bottom: 0.35rem;
}
.about-block a {
  color: var(--main-color);
  font-weight: 600;
  text-decoration: none;
}
.about-block a:hover {
  text-decoration: underline;
}
.about-block code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--input-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  color: var(--text-1);
}

.metrics-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
  line-height: 1.5;
}
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.85rem;
}
.metrics-grid .m {
  background: var(--input-bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  padding: 0.85rem 1rem;
}
.metrics-grid .m .k {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.metrics-grid .m .v {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  margin-top: 0.25rem;
  color: var(--main-color);
}

#metricsCard {
  display: none;
}
#metricsCard.is-visible {
  display: block;
}

.findings-list {
  margin: 0 0 1rem;
  padding-left: 1.15rem;
  color: var(--text-2);
  font-size: 0.88rem;
  line-height: 1.6;
}
.findings-list li {
  margin-bottom: 0.45rem;
}
.findings-list strong {
  color: var(--text-1);
}

.findings-fig {
  margin: 0 0 0.75rem;
}
.findings-fig img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  border: 1px solid var(--border-soft);
  display: block;
}
.findings-fig figcaption {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.45rem;
  font-family: var(--font-mono);
}
.fig-missing {
  display: none;
  padding: 1.1rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--input-bg);
  border-radius: var(--radius-card);
  border: 1px dashed var(--border-soft);
  font-family: var(--font-mono);
  line-height: 1.5;
}

.notebooks-cta {
  font-size: 0.86rem;
  color: var(--text-2);
  margin: 0;
}
.notebooks-cta a {
  color: var(--main-color);
  font-weight: 600;
  text-decoration: none;
}
.notebooks-cta a:hover {
  text-decoration: underline;
}

.limitations-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-2);
  font-size: 0.86rem;
  line-height: 1.58;
}
.limitations-list li {
  margin-bottom: 0.4rem;
}
.limitations-list strong {
  color: var(--text-1);
}

.cta-wrap {
  text-align: center;
  margin: 0.25rem 0 0;
}
a.cta-github {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--main-color);
  color: var(--btn-text-on-accent) !important;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-card);
  text-decoration: none !important;
  transition: background 0.15s;
}
a.cta-github:hover {
  background: var(--accent-hover);
}
a.cta-github svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: currentColor;
}
.cta-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 1.25rem 0 0;
  padding: 0 0.5rem;
  line-height: 1.5;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 520px) {
  .row {
    grid-template-columns: 1fr;
  }
}

.shell-content label {
  display: block;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}
.shell-content input,
.shell-content select {
  width: 100%;
  padding: 0.55rem 0.7rem;
  background: var(--input-bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  color: var(--text-1);
  font-family: "Poppins", sans-serif;
  font-size: 0.88rem;
}
.shell-content input:focus,
.shell-content select:focus {
  outline: none;
  border-color: var(--main-color);
}

.btns {
  display: flex;
  gap: 0.65rem;
  margin-top: 1.2rem;
  flex-wrap: wrap;
}
button.primary {
  font-family: "Poppins", sans-serif;
  font-size: 0.86rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-card);
  border: none;
  cursor: pointer;
  background: var(--main-color);
  color: var(--btn-text-on-accent);
  transition: background 0.15s;
}
button.primary:hover:not(:disabled) {
  background: var(--accent-hover);
}
button.primary:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}
button.secondary {
  font-family: "Poppins", sans-serif;
  font-size: 0.86rem;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-card);
  cursor: pointer;
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border-soft);
  transition: color 0.15s, border-color 0.15s;
}
button.secondary:hover {
  color: var(--text-1);
  border-color: var(--text-2);
}

#error {
  color: var(--danger);
  font-size: 0.84rem;
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  display: none;
}
#error.visible {
  display: block;
}

#result {
  display: none;
  margin-top: 1.25rem;
  padding: 1.2rem 1.25rem;
  background: var(--input-bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
}
#result.visible {
  display: block;
}
#result .art-section-title {
  color: var(--main-color);
  margin-bottom: 0.85rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}
@media (max-width: 480px) {
  .result-grid {
    grid-template-columns: 1fr;
  }
}

.result-item {
  background: var(--content-bg);
  border-radius: var(--radius-card);
  padding: 0.85rem;
  border: 1px solid var(--border-soft);
}
.result-item .label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
}
.result-item .value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
}
.result-item.risk-high .value {
  color: var(--danger);
}
.result-item.risk-medium .value {
  color: var(--warning);
}
.result-item.risk-low .value {
  color: var(--success);
}

.footer .art-copy a {
  color: var(--main-color);
  font-weight: 600;
}
.footer .art-copy a:hover {
  color: var(--text-1);
}