/*
 * about.css — ห้องสมุดโรงพยาบาลศรีธัญญา (about.html)
 * --------------------------------------------------
 * ใช้ร่วมกับ style.css (โหลดก่อนหน้าในหน้า about.html)
 * อาศัย CSS variables (--clr-*, --space-*, --radius-*, --shadow-*, --dur-*, --ease-out)
 * ที่ประกาศไว้ใน :root ของ style.css อยู่แล้ว ไม่ต้องประกาศซ้ำ
 *
 * ครอบคลุม:
 *   0. Back-home link (header)
 *   1. In-page nav tabs
 *   2. ส่วนที่ 4.1 — About intro + History timeline + Rules grid
 *   3. ส่วนที่ 4.2 — Map floorplan placeholder + Zone cards + Zone lightbox
 *   4. ส่วนที่ 4.3 — Staff cards (grid + card + skeleton)
 * --------------------------------------------------
 */

/* =============================================================
   0. BACK-HOME LINK (header, about.html เท่านั้น)
   ============================================================= */
.back-home-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: rgba(255,255,255,0.85);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1.5px solid rgba(255,255,255,0.25);
  transition: background var(--dur-fast), color var(--dur-fast), border-color var(--dur-fast);
}

.back-home-link:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.4);
  color: #fff;
}

/* =============================================================
   1. IN-PAGE NAV TABS
   ============================================================= */
.about-tabs {
  background: var(--clr-surface);
  border-bottom: 1.5px solid var(--clr-border);
  position: sticky;
  top: 0;
  z-index: 90;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.about-tabs::-webkit-scrollbar { display: none; }

.about-tabs-inner {
  display: flex;
  gap: 0.5rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  white-space: nowrap;
}

.about-tab-link {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--clr-text-sub);
  background: var(--clr-bg);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-pill);
  flex-shrink: 0;
  transition: background var(--dur-fast), color var(--dur-fast), border-color var(--dur-fast);
}

.about-tab-link:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  background: var(--clr-primary-pale);
}

/* =============================================================
   2. ส่วนที่ 4.1 — ABOUT INTRO + RULES
   ============================================================= */
.about-intro-card {
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-card);
  margin-bottom: var(--space-xl);
}

.about-intro-card p {
  font-size: 0.92rem;
  color: var(--clr-text-sub);
  line-height: 1.85;
  margin: 0;
}

/* ── History timeline (ประวัติความเป็นมา) ── */
.history-section {
  margin-bottom: var(--space-xl);
}

.history-section-head {
  margin-bottom: 1.75rem;
}

.history-section-title {
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  font-weight: 800;
  color: var(--clr-primary);
  line-height: 1.3;
  margin: 0.25rem 0 0;
}

.history-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

/* เส้นไทม์ไลน์แนวตั้ง */
.history-timeline::before {
  content: '';
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 27px;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-primary-light), var(--clr-border));
}

@media (min-width: 640px) {
  .history-timeline::before { left: 39px; }
}

.history-item {
  position: relative;
  display: flex;
  gap: 1rem;
  padding-bottom: 1.5rem;
}

.history-item:last-child { padding-bottom: 0; }

.history-marker {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  width: 56px;
  display: flex;
  justify-content: center;
  padding-top: 2px;
}

@media (min-width: 640px) { .history-marker { width: 80px; } }

.history-year-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  padding: 6px 8px;
  background: var(--clr-primary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 800;
  line-height: 1.25;
  border-radius: var(--radius-pill);
  box-shadow: 0 0 0 4px var(--clr-bg);
  text-align: center;
}

@media (min-width: 640px) {
  .history-year-badge { min-width: 72px; font-size: 0.8rem; padding: 7px 10px; }
}

.history-card {
  flex: 1;
  min-width: 0;
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--dur-mid) var(--ease-out),
              border-color var(--dur-mid);
}

.history-card:hover {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(13,115,119,0.08), var(--shadow-lift);
}

.history-director {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--clr-text-main);
  margin: 0 0 0.6rem;
  line-height: 1.4;
}

.history-role {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--clr-primary);
  background: var(--clr-primary-pale);
  padding: 2px 10px;
  border-radius: var(--radius-pill);
}

.history-desc {
  font-size: 0.85rem;
  color: var(--clr-text-sub);
  line-height: 1.8;
  margin: 0;
}

.history-date-note {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  margin: 0.6rem 0 0;
}

.history-closing {
  margin-top: 1.75rem;
  margin-bottom: 0;
}

.history-credit {
  font-size: 0.76rem;
  color: var(--clr-text-muted);
  margin: 0.85rem 0 0;
  text-align: right;
  font-style: italic;
}

.rules-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px)  { .rules-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .rules-grid { grid-template-columns: repeat(4, 1fr); } }

.rule-card {
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-out),
              border-color var(--dur-mid);
}

.rule-card:hover {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(13,115,119,0.08), var(--shadow-lift);
  transform: translateY(-4px);
}

.rule-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--clr-primary-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.rule-card-title {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--clr-text-main);
  margin: 0 0 0.6rem;
  line-height: 1.4;
}

.rule-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.rule-list li {
  font-size: 0.82rem;
  color: var(--clr-text-sub);
  line-height: 1.6;
  padding-left: 1.1rem;
  position: relative;
}

.rule-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clr-primary-light);
}

.rule-text {
  font-size: 0.82rem;
  color: var(--clr-text-sub);
  line-height: 1.7;
  margin: 0;
}

/* =============================================================
   3. ส่วนที่ 4.2 — MAP FLOORPLAN + ZONE CARDS + LIGHTBOX
   ============================================================= */
.map-floorplan-frame {
  border: 1.5px dashed var(--clr-border-hover);
  border-radius: var(--radius-lg);
  background: var(--clr-surface);
  margin-bottom: var(--space-xl);
  overflow: hidden;
}

.map-floorplan-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 3rem 1.5rem;
  color: var(--clr-text-muted);
  text-align: center;
}

.map-floorplan-placeholder p {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0;
  color: var(--clr-text-sub);
}

.map-floorplan-hint {
  font-size: 0.72rem;
  color: var(--clr-text-muted);
}

.map-floorplan-img {
  width: 100%;
  height: auto;
  display: block;
}

.zone-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px)  { .zone-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .zone-grid { grid-template-columns: repeat(3, 1fr); } }

.zone-card {
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-align: left;
  cursor: pointer;
  padding: 0;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-out),
              border-color var(--dur-mid);
}

.zone-card:hover {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(13,115,119,0.08), var(--shadow-lift);
  transform: translateY(-4px);
}

.zone-card-img-wrap {
  position: relative;
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, var(--clr-primary-pale), var(--clr-border));
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.zone-card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.zone-card-placeholder {
  color: var(--clr-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.zone-card-zoom {
  position: absolute;
  bottom: 10px;
  right: 10px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(255,255,255,0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  box-shadow: var(--shadow-card);
}

.zone-card-body {
  padding: 1rem 1.1rem 1.2rem;
}

.zone-card-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--clr-text-main);
  margin: 0 0 0.35rem;
}

.zone-card-desc {
  font-size: 0.78rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
  margin: 0;
}

.zone-grid-hint {
  font-size: 0.74rem;
  color: var(--clr-text-muted);
  margin-top: 1rem;
  text-align: center;
}

/* ── Zone lightbox (popup ดูรูปขนาดใหญ่) ── */
.zone-lightbox-box {
  max-width: 720px;
}

.zone-lightbox-body {
  display: flex;
}

.zone-lightbox-placeholder {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 3rem 1.5rem;
  color: var(--clr-text-muted);
  text-align: center;
}

.zone-lightbox-placeholder p {
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0;
  color: var(--clr-text-sub);
}

/* =============================================================
   4. ส่วนที่ 4.3 — STAFF CARDS
   ============================================================= */
.staff-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 640px)  { .staff-grid { grid-template-columns: repeat(3, 1fr); gap: 1.25rem; } }
@media (min-width: 1024px) { .staff-grid { grid-template-columns: repeat(4, 1fr); } }

.staff-card {
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-out),
              border-color var(--dur-mid);
}

.staff-card:hover {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(13,115,119,0.08), var(--shadow-lift);
  transform: translateY(-4px);
}

.staff-card--skeleton { cursor: default; }
.staff-card--skeleton:hover {
  border-color: var(--clr-border);
  box-shadow: var(--shadow-card);
  transform: none;
}

.staff-photo,
.staff-photo-skeleton {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 0.85rem;
  background: var(--clr-primary-pale);
  display: block;
}

.staff-photo--fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--clr-text-muted);
}

.staff-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--clr-text-main);
  line-height: 1.4;
  margin: 0;
}

.staff-position {
  font-size: 0.78rem;
  color: var(--clr-primary-light);
  font-weight: 600;
  margin: 0.25rem 0 0;
}

.staff-contact {
  font-size: 0.74rem;
  color: var(--clr-text-muted);
  margin: 0.4rem 0 0;
  word-break: break-word;
}