/* ============================================================
   PHI RESILIENCE — Periodic Table CSS
   These styles were missing from style.css, so periodic.html
   was rendering without visual layout.
   ============================================================ */

/* Layout wrapper */
#periodic .periodic-grid{
  width: 100%;
  display: grid;
  grid-template-columns: repeat(7, minmax(170px, 1fr));
  gap: 18px;
  align-items: start;
  margin-top: 1.75rem;
}

/* Column */
.pt-col{
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Column header */
.pt-header{
  height: 52px;
  border-radius: 14px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
}

.pt-sym{
  color: #fff;
  font-weight: 900;
  letter-spacing: .12em;
  font-size: 1.05rem;
  line-height: 1;
}

.pt-cat{
  color: rgba(255,255,255,.85);
  font-weight: 650;
  font-size: .72rem;
  letter-spacing: .02em;
  line-height: 1.1;
  text-transform: uppercase;
}

/* Items list */
.pt-items{
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}

/* Each element tile */
.pt-item{
  position: relative;
  border-radius: 14px;
  border: 1px solid rgba(13,115,119,.22);
  background: linear-gradient(180deg, rgba(13,115,119,.06), rgba(13,115,119,.02));
  padding: 14px 12px;
  cursor: default;
  box-shadow: 0 8px 26px rgba(13,115,119,.10);
  transition: transform .25s cubic-bezier(.2,.8,.2,1),
              box-shadow .25s,
              border-color .25s,
              background .25s;
  min-height: 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}

.pt-item:hover{
  transform: translateY(-4px);
  border-color: rgba(212,160,23,.55);
  box-shadow: 0 14px 40px rgba(0,0,0,.12);
  background: linear-gradient(180deg, rgba(212,160,23,.12), rgba(13,115,119,.04));
}

.pt-item .pt-code{
  font-family: var(--font-serif, "Playfair Display", Georgia, serif);
  font-weight: 900;
  font-size: .92rem;
  color: var(--teal, #0D7377);
}

.pt-item span:not(.pt-code){
  font-size: .86rem;
  color: var(--navy, #1A2E4A);
  font-weight: 650;
  line-height: 1.2;
}

/* Tooltip for hover/touch */
.pt-tooltip{
  position: fixed;
  left: -9999px;
  top: -9999px;
  z-index: 99999;
  pointer-events: none;
  max-width: 260px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(13,115,119,.22);
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 18px 60px rgba(0,0,0,.18);
  opacity: 0;
  transform: translateY(6px) scale(.98);
  transition: opacity .15s ease, transform .15s ease;
}

.pt-tooltip.show{
  opacity: 1;
  transform: translateY(0) scale(1);
}

.pt-tooltip strong{
  display: block;
  font-family: var(--font-serif, "Playfair Display", Georgia, serif);
  font-size: .95rem;
  color: var(--navy, #1A2E4A);
  margin-bottom: 6px;
}

.pt-tooltip small{
  font-size: .78rem;
  color: var(--teal-bright, #1a9a9f);
}

.pt-tooltip::after{
  content: '';
  position: absolute;
  width: 10px;
  height: 10px;
  left: 18px;
  bottom: -6px;
  background: rgba(255,255,255,.96);
  border-right: 1px solid rgba(13,115,119,.22);
  border-bottom: 1px solid rgba(13,115,119,.22);
  transform: rotate(45deg);
}

/* Responsive */
@media (max-width: 1200px){
  #periodic .periodic-grid{ grid-template-columns: repeat(4, minmax(170px, 1fr)); }
}

@media (max-width: 900px){
  #periodic .periodic-grid{ grid-template-columns: repeat(2, minmax(170px, 1fr)); }
}

@media (max-width: 560px){
  #periodic .periodic-grid{ grid-template-columns: 1fr; }
  .pt-header{ height: auto; }
}

@media (prefers-reduced-motion: reduce){
  .pt-item{ transition: none; }
  .pt-tooltip{ transition: none; }
}