/* AI Lab 28-day index + day detail */

.lab-28-page {
  background: var(--navy-darker);
  padding-top: var(--header-h);
}

.lab-28-page .site-header {
  position: fixed;
  background: rgba(6, 21, 45, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.lab-28-page .header-inner {
  justify-content: space-between;
}

.lab-28-page .logo--sr {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
  font-weight: 700;
  font-size: 1.05rem;
}

.lab-28-wrap {
  padding-block: clamp(2rem, 6vw, 3rem) clamp(3rem, 8vw, 4.5rem);
}

.lab-28-back {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  transition: color 0.2s;
}

.lab-28-back:hover,
.lab-28-back:focus-visible {
  color: var(--accent);
}

.lab-28-header {
  max-width: 40rem;
  margin-bottom: 2.5rem;
}

.lab-28-header .section-label {
  margin-bottom: 0.5rem;
}

.lab-28-header .lab-section-preview {
  margin-bottom: 0.75rem;
}

.lab-28-header h1 {
  font-size: clamp(1.625rem, 5vw, 2.25rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

.lab-28-intro {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0;
}

.lab-28-grid {
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 560px) {
  .lab-28-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .lab-28-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.875rem;
  }
}

.lab-28-item {
  display: block;
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 1.15rem;
  transition: border-color 0.2s, transform 0.2s var(--ease);
}

.lab-28-item:hover {
  border-color: rgba(255, 255, 255, 0.14);
  transform: translateY(-1px);
}

.lab-28-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.lab-28-item-num {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0 0 0.45rem;
}

.lab-28-item-title {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
  margin: 0;
}

.lab-28-item--soon .lab-28-item-title {
  color: color-mix(in srgb, var(--text) 88%, var(--text-muted) 12%);
}

.lab-section-preview {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 0.65rem;
}

.lab-day-wrap {
  padding-block: clamp(2rem, 6vw, 3rem) clamp(3rem, 8vw, 4.5rem);
}

.lab-day-header {
  max-width: 40rem;
  margin-bottom: 2rem;
}

.lab-day-header .lab-eyebrow {
  margin-bottom: 0.75rem;
}

.lab-day-header h1 {
  font-size: clamp(1.5rem, 4.5vw, 2rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

.lab-day-body {
  max-width: 40rem;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-muted);
}

.lab-day-body p {
  margin: 0 0 1.15rem;
}

.lab-day-nav {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  max-width: 40rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.lab-day-nav a {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--accent);
}

.lab-day-nav a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.lab-day-nav-label {
  color: var(--text-muted);
  font-weight: 500;
}

.lab-day-status {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}