/* ============================================================
   LIBRARY MODEL — honest framing of public-domain + imports
   ============================================================ */
.section-dark {
  background:
    linear-gradient(180deg,
      var(--td-bg-base) 0%,
      color-mix(in oklab, var(--td-bg-surface) 60%, var(--td-bg-base)) 100%);
  position: relative;
  overflow: hidden;
}
.section-dark::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 50% 35% at 20% 20%, color-mix(in oklab, var(--td-accent) 8%, transparent), transparent 60%),
    radial-gradient(ellipse 50% 35% at 80% 80%, color-mix(in oklab, var(--td-accent-secondary) 10%, transparent), transparent 60%);
  pointer-events: none;
}
.section-dark > .shell { position: relative; }

.section-head-center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.section-head-center .eyebrow { justify-content: center; }

.lm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 48px;
}
.lm-card {
  position: relative;
  padding: 36px 32px 32px;
  border-radius: var(--td-radius-2xl);
  border: 1px solid var(--td-border-default);
  background: color-mix(in oklab, var(--td-bg-elevated) 70%, transparent);
  backdrop-filter: blur(14px);
  overflow: hidden;
  transition: transform .3s cubic-bezier(.2,.8,.3,1), border-color .25s, box-shadow .3s;
}
.lm-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 60px -28px rgba(0,0,0,.4);
}

.lm-card-public {
  border-color: color-mix(in oklab, var(--td-accent) 30%, var(--td-border-default));
}
.lm-card-public::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 0% 0%, color-mix(in oklab, var(--td-accent) 12%, transparent), transparent 60%);
  pointer-events: none;
}

.lm-card-import {
  border-color: color-mix(in oklab, var(--td-accent-secondary) 30%, var(--td-border-default));
}
.lm-card-import::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 100% 0%, color-mix(in oklab, var(--td-accent-secondary) 14%, transparent), transparent 60%);
  pointer-events: none;
}

.lm-num {
  position: absolute;
  top: 24px; right: 28px;
  font-family: var(--td-font-display);
  font-size: 48px;
  font-weight: 600;
  line-height: 1;
  color: color-mix(in oklab, var(--td-text-primary) 8%, transparent);
  letter-spacing: -0.04em;
  pointer-events: none;
}

.lm-icon {
  width: 56px; height: 56px;
  border-radius: var(--td-radius-xl);
  background: color-mix(in oklab, var(--td-accent) 12%, var(--td-bg-surface));
  color: var(--td-accent);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}
.lm-card-import .lm-icon {
  background: color-mix(in oklab, var(--td-accent-secondary) 14%, var(--td-bg-surface));
  color: var(--td-accent-secondary);
}

.lm-eyebrow {
  font-size: 11px; font-weight: 800; letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--td-text-tertiary);
  margin-bottom: 8px;
  position: relative; z-index: 1;
}

.lm-title {
  font-family: var(--td-font-display);
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--td-text-primary);
  margin: 0 0 14px;
  position: relative; z-index: 1;
}
.lm-title em {
  font-style: italic;
  color: var(--td-accent);
  font-weight: 500;
}
.lm-card-import .lm-title em {
  color: var(--td-accent-secondary);
}

.lm-body {
  font-size: 15px;
  line-height: 1.6;
  color: var(--td-text-secondary);
  margin: 0 0 20px;
  position: relative; z-index: 1;
}

.lm-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative; z-index: 1;
}
.lm-item {
  font-size: 13px;
  display: flex; align-items: center; gap: 10px;
  color: var(--td-text-secondary);
}
.lm-item svg {
  color: var(--td-success);
  flex-shrink: 0;
}
.lm-tag {
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  background: color-mix(in oklab, var(--td-accent) 18%, transparent);
  color: var(--td-accent);
  border: 1px solid color-mix(in oklab, var(--td-accent) 30%, transparent);
}

/* Honesty banner */
.lm-honest {
  margin-top: 36px;
  padding: 24px 28px;
  border-radius: var(--td-radius-xl);
  background: color-mix(in oklab, var(--td-bg-surface) 80%, transparent);
  border: 1px solid var(--td-border-default);
  display: flex;
  gap: 18px;
  align-items: flex-start;
  position: relative;
}
.lm-honest::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--td-accent);
  border-radius: var(--td-radius-xl) 0 0 var(--td-radius-xl);
}
.lm-honest-icon {
  flex-shrink: 0;
  width: 40px; height: 40px;
  border-radius: var(--td-radius-md);
  background: color-mix(in oklab, var(--td-accent) 14%, var(--td-bg-elevated));
  color: var(--td-accent);
  display: flex; align-items: center; justify-content: center;
}
.lm-honest-title {
  font-family: var(--td-font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--td-text-primary);
  margin-bottom: 6px;
}
.lm-honest-body p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--td-text-secondary);
  margin: 0;
}
.lm-honest-body b {
  color: var(--td-text-primary);
  font-weight: 600;
}

/* Equation row */
.lm-equation {
  margin-top: 40px;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 12px;
  align-items: center;
  padding: 28px 24px;
  border-radius: var(--td-radius-2xl);
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--td-accent) 8%, var(--td-bg-elevated)),
    color-mix(in oklab, var(--td-accent-secondary) 8%, var(--td-bg-elevated)));
  border: 1px solid var(--td-border-default);
}
.lm-eq-block {
  text-align: center;
  padding: 12px;
}
.lm-eq-num {
  font-family: var(--td-font-display);
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--td-accent);
  line-height: 1;
  margin-bottom: 8px;
}
.lm-eq-result .lm-eq-num {
  font-size: 28px;
  color: var(--td-text-primary);
}
.lm-eq-block:nth-child(3) .lm-eq-num {
  color: var(--td-accent-secondary);
}
.lm-eq-label {
  font-size: 12px;
  color: var(--td-text-tertiary);
  line-height: 1.5;
  letter-spacing: 0.1px;
}
.lm-eq-op {
  font-family: var(--td-font-display);
  font-size: 36px;
  font-weight: 300;
  color: var(--td-text-tertiary);
  line-height: 1;
  padding: 0 12px;
}

@media (max-width: 920px) {
  .lm-grid { grid-template-columns: 1fr; }
  .lm-equation { grid-template-columns: 1fr; gap: 4px; padding: 24px 16px; }
  .lm-eq-op { transform: rotate(90deg); padding: 8px 0; }
}