/* ==========================================================================
   Dental Decision Library — hub, category pages and editorial articles
   templates/library/*.html

   Builds on static/css/lumben-page-kit.css (tokens, buttons, hero shell, cards)
   and static/css/treatments.css (listing + article reading components), which
   must load first. Only Library-specific pieces live here: category chips, the
   audience filter, grouped sections, the featured card, editorial card media,
   and the editorial article blocks (short answer, practical block, LUMBEN
   context, sources, CTA band). No new colours or fonts — LUMBEN tokens only.
   ========================================================================== */

/* ── Hero ────────────────────────────────────────────────────────────────── */
.lb-hero .hero-title .title {
  font-size: clamp(30px, 6.2vw, 84px);
  line-height: 1.05;
  overflow-wrap: break-word;
}
.lb-hero .tl-hero-sub { font-size: clamp(16px, 1.6vw, 19px); line-height: 1.6; }
.lb-hero__crumbs { margin-bottom: 8px; }

/* ── Category chips ──────────────────────────────────────────────────────── */
.lb-cats { margin: 0 0 24px; }
.lb-cats__list {
  display: flex; flex-wrap: wrap; gap: 8px;
  list-style: none; margin: 0; padding: 0;
}
.lb-cat {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 44px; padding: 10px 16px;
  background: var(--td-surface); border: 1px solid var(--td-line); border-radius: 999px;
  color: var(--td-navy); font-size: 14px; line-height: 1.2; letter-spacing: .02em;
  text-decoration: none;
  transition: background-color .15s, border-color .15s, color .15s;
}
.lb-cat .td-icon { width: 16px; height: 16px; color: var(--td-accent); }
.lb-cat:hover { border-color: #c9d4e2; background: var(--td-accent-soft); color: var(--td-navy); text-decoration: none; }
.lb-cat[aria-current="page"] { background: var(--td-navy); border-color: var(--td-navy); color: #fff; font-weight: 600; }
.lb-cat[aria-current="page"] .td-icon { color: var(--td-accent-bright); }

/* ── Toolbar: search + audience filter + count ───────────────────────────── */
.lb-toolbar { justify-content: flex-start; margin-bottom: 32px; }
.lb-toolbar .tl-count { margin-left: auto; }
.lb-segment {
  display: inline-flex; flex-wrap: wrap; gap: 4px; padding: 4px;
  background: var(--td-surface); border: 1px solid #cdd5df; border-radius: 999px;
}
.lb-segment__btn {
  min-height: 44px; padding: 8px 16px;
  background: transparent; border: 0; border-radius: 999px;
  color: var(--td-ink-2); font-size: 14px; line-height: 1.2;
  cursor: pointer;
  transition: background-color .15s, color .15s;
}
.lb-segment__btn:hover { background: var(--td-accent-soft); color: var(--td-navy); }
.lb-segment__btn[aria-pressed="true"] { background: var(--td-navy); color: #fff; font-weight: 600; }
@media (max-width: 575px) {
  .lb-segment { width: 100%; justify-content: space-between; }
  .lb-segment__btn { flex: 1 1 auto; padding: 8px 10px; }
  .lb-toolbar .tl-count { margin-left: 0; }
}

/* ── Featured ────────────────────────────────────────────────────────────── */
.lb-featured { margin: 0 0 48px; }
.lb-featured[hidden] { display: none; }
.lb-featured__label {
  margin: 0 0 12px; color: var(--td-ink-2);
  font-size: 12px; letter-spacing: .14em; text-transform: uppercase;
}
.lb-feature {
  position: relative; display: grid; grid-template-columns: minmax(0, 1fr);
  background: var(--td-surface); border: 1px solid var(--td-line); border-radius: 18px;
  overflow: hidden;
  transition: box-shadow .2s var(--td-ease), border-color .2s;
}
.lb-feature:hover { box-shadow: 0 16px 40px rgba(16, 24, 40, .10); border-color: #d0d8e3; }
.lb-feature:has(.tl-card__link:focus-visible) { outline: 3px solid var(--td-accent-bright); outline-offset: 3px; }
.lb-feature__media { position: relative; aspect-ratio: 16 / 9; background: #e9eef4; }
.lb-feature__media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.lb-feature__body { display: flex; flex-direction: column; gap: 12px; padding: 24px; }
.lb-feature__title { margin: 0; font-size: clamp(22px, 2.6vw, 30px); line-height: 1.2; letter-spacing: .02em; text-wrap: balance; }
.lb-feature__excerpt { margin: 0; color: var(--td-ink-2); font-size: 17px; line-height: 1.6; max-width: 60ch; }
@media (min-width: 768px) {
  .lb-feature { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  .lb-feature__media { aspect-ratio: auto; min-height: 280px; }
  .lb-feature__body { padding: 32px 36px; justify-content: center; }
}

/* ── Category groups (hub) ───────────────────────────────────────────────── */
.lb-group { margin: 0 0 64px; scroll-margin-top: var(--td-nav-offset, 92px); }
.lb-group[hidden] { display: none; }
.lb-group:last-child { margin-bottom: 0; }
.lb-group__head {
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 8px 24px;
  margin: 0 0 20px; padding-top: 18px; border-top: 1px solid var(--td-line);
}
.lb-group__title {
  margin: 0 0 6px; color: var(--td-navy);
  font-size: clamp(22px, 2.6vw, 30px); line-height: 1.2; letter-spacing: .01em;
}
.lb-group__title a { color: inherit; text-decoration: none; }
.lb-group__title a:hover { color: var(--td-accent); text-decoration: none; }
.lb-group__desc { margin: 0; max-width: 64ch; color: var(--td-ink-2); font-size: 16px; line-height: 1.55; }
.lb-group__more {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px;
  color: var(--td-accent); font-size: 13px; letter-spacing: .08em; text-transform: uppercase;
  text-decoration: none; white-space: nowrap;
}
.lb-group__more .td-icon { width: 16px; height: 16px; transition: transform .2s var(--td-ease); }
.lb-group__more:hover { color: var(--td-navy); text-decoration: none; }
.lb-group__more:hover .td-icon { transform: translateX(4px); }

/* ── Editorial cards ─────────────────────────────────────────────────────── */
.lb-card__eyebrow {
  margin: 0; color: var(--td-accent);
  font-size: 11px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; line-height: 1.4;
}
/* Decorative category artwork for articles without an editorial image. The category
   is always named in text (eyebrow), never by colour alone. */
.lb-card__placeholder {
  position: relative; color: rgba(255, 255, 255, .92);
  background:
    radial-gradient(rgba(255, 255, 255, .14) 1px, transparent 1.4px) 0 0 / 18px 18px,
    radial-gradient(120% 120% at 100% 0%, #1d4f86 0%, var(--td-navy) 62%);
}
.lb-card__placeholder .td-icon { width: 52px; height: 52px; }
.lb-card__media--dental-ai .lb-card__placeholder {
  background:
    radial-gradient(rgba(255, 255, 255, .14) 1px, transparent 1.4px) 0 0 / 18px 18px,
    radial-gradient(120% 120% at 100% 0%, #155e97 0%, #04101f 70%);
}
.lb-card__media--imaging .lb-card__placeholder {
  background:
    radial-gradient(rgba(255, 255, 255, .14) 1px, transparent 1.4px) 0 0 / 18px 18px,
    radial-gradient(120% 120% at 0% 100%, #2a6fa8 0%, #0b2544 65%);
}
.lb-card__media--patient-guides .lb-card__placeholder {
  background:
    radial-gradient(rgba(255, 255, 255, .14) 1px, transparent 1.4px) 0 0 / 18px 18px,
    radial-gradient(120% 120% at 100% 100%, #1f6e86 0%, #062437 68%);
}
.lb-card__media--professional .lb-card__placeholder {
  background:
    radial-gradient(rgba(255, 255, 255, .14) 1px, transparent 1.4px) 0 0 / 18px 18px,
    radial-gradient(120% 120% at 0% 0%, #34508a 0%, #0b1733 66%);
}
.lb-feature__media .lb-card__placeholder { display: flex; align-items: center; justify-content: center; height: 100%; min-height: 200px; }
.lb-feature__media .lb-card__placeholder .td-icon { width: 72px; height: 72px; }

/* ── Empty state ─────────────────────────────────────────────────────────── */
.lb-empty[hidden] { display: none; }
.lb-empty .td-btn { margin-top: 4px; }

/* ==========================================================================
   Editorial article
   ========================================================================== */
.lb-article-hero { min-height: clamp(420px, 66vh, 640px); }
.lb-hero-pattern {
  position: absolute; inset: 0;
  background:
    radial-gradient(rgba(168, 220, 250, .16) 1px, transparent 1.5px) 0 0 / 22px 22px,
    radial-gradient(70% 90% at 85% 10%, rgba(75, 176, 232, .32) 0%, rgba(75, 176, 232, 0) 70%),
    linear-gradient(135deg, #04101f 0%, #0b2544 100%);
}
.lb-article-title { overflow-wrap: break-word; hyphens: auto; }
.lb-standfirst { font-size: clamp(16px, 1.8vw, 20px); letter-spacing: .01em; line-height: 1.55; }
@media (max-width: 575px) {
  .lb-crumb-current { display: none !important; }   /* the H1 right below says the same */
  .lb-cat { padding: 10px 13px; font-size: 13px; }
}
.lb-crumb-current {
  display: inline-block !important; max-width: min(36ch, 70vw);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; vertical-align: middle;
}

/* Short answer */
.lb-answer {
  margin: 0 0 24px; padding: 22px 24px; max-width: 76ch;
  background: var(--td-surface); border: 1px solid var(--td-line); border-top: 4px solid var(--td-navy);
  border-radius: var(--td-radius); box-shadow: var(--td-shadow);
  scroll-margin-top: var(--td-nav-offset);
}
.lb-answer__title {
  display: flex; align-items: center; gap: 10px;
  margin: 0 0 10px; color: var(--td-navy);
  font-size: 14px; letter-spacing: .12em; text-transform: uppercase;
}
.lb-answer__title .td-icon { width: 20px; height: 20px; color: var(--td-accent); }
.lb-answer__body { color: var(--td-ink); font-size: 18px; line-height: 1.65; }
.lb-answer__body p { margin: 0 0 12px; color: inherit; font-size: inherit; line-height: inherit; }
.lb-answer__body p:last-child { margin-bottom: 0; }

/* What this means for you */
.lb-practical > .td-rich {
  padding: 22px 24px; max-width: 76ch;
  background: var(--td-good-soft); border-radius: var(--td-radius);
}
.lb-practical .td-rich ul > li::before { background: var(--td-good); }

/* LUMBEN context */
.lb-context {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 16px; align-items: start;
  margin: -16px 0 56px; padding: 22px; max-width: 76ch;
  background: var(--td-accent-soft); border: 1px solid #cfe3f3; border-radius: var(--td-radius);
}
.lb-context__title { margin: 4px 0 8px; color: var(--td-navy); font-size: 14px; letter-spacing: .12em; text-transform: uppercase; }
.lb-context .td-rich { font-size: 16px; }
.lb-context .td-inline-cta__icon { background: var(--td-surface); }

/* Sources */
.lb-sources__list {
  margin: 0; padding: 0; max-width: 76ch; list-style: none; counter-reset: lb-src;
  border-top: 1px solid var(--td-line);
}
.lb-source {
  position: relative; counter-increment: lb-src;
  display: flex; flex-direction: column; gap: 2px;
  padding: 14px 0 14px 40px; border-bottom: 1px solid var(--td-line);
}
.lb-source::before {
  content: counter(lb-src); position: absolute; left: 0; top: 14px;
  width: 26px; height: 26px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--td-accent-soft); color: var(--td-navy); font-size: 13px; font-weight: 600;
}
.lb-source__link {
  color: var(--td-accent); font-size: 16px; line-height: 1.5;
  text-decoration: underline; text-underline-offset: 3px;
  overflow-wrap: anywhere;
}
.lb-source__link .td-icon { width: 14px; height: 14px; margin-left: 4px; vertical-align: -1px; }
.lb-source__link:hover { color: var(--td-navy); }
.lb-source__meta { color: var(--td-ink-2); font-size: 14px; line-height: 1.5; }
.lb-sources__reviewed { margin: 14px 0 0; color: var(--td-ink-2); font-size: 14px; }

/* Single call to action */
.lb-cta-band { padding: 56px 0; background: var(--td-bg); border-top: 1px solid var(--td-line); }
.lb-cta { margin: 0; }
.lb-cta--soft {
  background:
    radial-gradient(90% 140% at 100% 0%, rgba(75, 176, 232, .22) 0%, rgba(75, 176, 232, 0) 60%),
    var(--td-accent-soft);
  color: var(--td-ink); border: 1px solid #cfe3f3;
}
.lb-cta--soft .td-cta__title { color: var(--td-navy); }
.lb-cta--soft .td-cta__sub { color: var(--td-ink); }
.lb-cta--soft .td-cta__badge { background: var(--td-surface); border-color: #cfe3f3; color: var(--td-navy); }
.lb-cta--soft .td-btn--light { background: var(--td-navy); color: #fff; }
.lb-cta--soft .td-btn--light:hover { background: #0a2d5c; color: #fff; }
.lb-side-cta--soft { background: var(--td-accent-soft); border: 1px solid #cfe3f3; color: var(--td-ink); }
.lb-side-cta--soft .td-ai-card__title { color: var(--td-navy); }
.lb-side-cta--soft .td-btn--light { background: var(--td-navy); color: #fff; }
.lb-side-cta--soft .td-btn--light:hover { background: #0a2d5c; color: #fff; }

/* Staff preview notice */
.lb-preview {
  position: fixed; left: 50%; bottom: 20px; z-index: 99990; transform: translateX(-50%);
  display: flex; align-items: center; gap: 10px; width: min(640px, calc(100vw - 32px));
  margin: 0; padding: 12px 18px; border-radius: 14px;
  background: var(--td-caution); color: #fff; font-size: 14px; line-height: 1.45;
  box-shadow: 0 8px 32px rgba(0, 0, 0, .25);
}
.lb-preview .td-icon { width: 18px; height: 18px; }

/* "Not available in this language" */
.lb-unavailable { padding-top: 160px; }
.lb-unavailable__card {
  max-width: 720px; margin: 0 auto; padding: clamp(24px, 4vw, 40px);
  background: var(--td-surface); border: 1px solid var(--td-line); border-radius: 18px;
}
.lb-unavailable__title { margin: 8px 0 14px; color: var(--td-navy); font-size: clamp(24px, 3vw, 34px); line-height: 1.2; }
.lb-unavailable__card p { color: var(--td-ink-2); font-size: 17px; line-height: 1.6; }
.lb-unavailable__list { display: grid; gap: 12px; margin: 20px 0; padding: 0; list-style: none; }
.lb-unavailable__list li { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; }
.lb-unavailable__list .td-btn { text-transform: none; letter-spacing: .02em; font-size: 15px; text-align: left; }
.lb-unavailable__lang { color: var(--td-ink-2); font-size: 14px; }
.lb-unavailable__more a { color: var(--td-accent); text-decoration: underline; text-underline-offset: 3px; }

/* Focus ring for Library-only controls (the page kit covers links/buttons/inputs) */
.lb-page .lb-segment__btn:focus-visible,
.lb-page .lb-cat:focus-visible { outline: 3px solid var(--td-accent-bright); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  .lb-page *, .lb-page *::before, .lb-page *::after { transition-duration: .01ms !important; }
  .lb-group__more:hover .td-icon { transform: none; }
}