/* ==============================
   PERIODIC TABLE CHEMISTRY TOOL
   Green & Gold Luxury Theme
   ============================== */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;600;700;900&family=Crimson+Pro:ital,wght@0,300;0,400;0,600;1,400&display=swap');

:root {
  --bg-deep:       #071a0e;
  --bg-card:       #0b2414;
  --bg-panel:      #0f2e1a;
  --bg-hover:      #143d22;
  --gold-primary:  #d4a017;
  --gold-light:    #f0c040;
  --gold-dim:      #a07810;
  --green-bright:  #2ecc71;
  --green-mid:     #27ae60;
  --green-dark:    #1a7a42;
  --text-primary:  #f0c040;
  --text-secondary:#c8a030;
  --text-dim:      #8a7020;
  --text-white:    #e8f5e9;
  --border-gold:   rgba(212,160,23,0.35);
  --border-green:  rgba(46,204,113,0.25);
  --shadow-gold:   0 0 20px rgba(212,160,23,0.15);
  --shadow-card:   0 4px 24px rgba(0,0,0,0.6);
  --radius-sm:     6px;
  --radius-md:     10px;
  --radius-lg:     16px;

  /* Category colors */
  --cat-alkali:         #c0392b;
  --cat-alkaline:       #e67e22;
  --cat-transition:     #2980b9;
  --cat-post-transition:#8e44ad;
  --cat-metalloid:      #16a085;
  --cat-nonmetal:       #27ae60;
  --cat-halogen:        #d35400;
  --cat-noble:          #2c3e50;
  --cat-lanthanide:     #7f8c8d;
  --cat-actinide:       #95a5a6;
  --cat-unknown:        #34495e;
}

/* ─── WRAPPER ─── */
#ptct-wrapper {
  font-family: 'Crimson Pro', serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  padding: 20px 12px 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-gold);
  box-shadow: var(--shadow-gold), 0 0 80px rgba(0,0,0,0.8);
  position: relative;
  overflow: hidden;
  width: 100%;
  box-sizing: border-box;
}

#ptct-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(46,204,113,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 80%, rgba(212,160,23,0.06) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

#ptct-wrapper > * { position: relative; z-index: 1; }

/* ─── HEADER ─── */
.ptct-header {
  text-align: center;
  margin-bottom: 24px;
}

.ptct-title {
  font-family: 'Cinzel', serif;
  font-size: clamp(20px, 4vw, 38px);
  font-weight: 900;
  color: var(--gold-primary);
  text-shadow: 0 0 30px rgba(212,160,23,0.5), 0 2px 4px rgba(0,0,0,0.8);
  letter-spacing: 0.08em;
  margin: 0 0 4px;
  line-height: 1.1;
}

.ptct-subtitle {
  font-family: 'Crimson Pro', serif;
  font-style: italic;
  color: var(--text-secondary);
  font-size: clamp(13px, 2vw, 17px);
  letter-spacing: 0.12em;
  margin: 0;
}

/* ─── SEARCH BAR ─── */
.ptct-search-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0 auto 24px;
  max-width: 480px;
  flex-wrap: wrap;
}

.ptct-search-input {
  flex: 1;
  min-width: 180px;
  background: var(--bg-card);
  border: 1.5px solid var(--border-gold);
  color: var(--gold-light);
  font-family: 'Cinzel', serif;
  font-size: 15px;
  padding: 10px 16px;
  border-radius: 50px;
  outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.4);
}

.ptct-search-input::placeholder { color: var(--text-dim); }
.ptct-search-input:focus {
  border-color: var(--gold-primary);
  box-shadow: 0 0 0 3px rgba(212,160,23,0.2), inset 0 2px 8px rgba(0,0,0,0.4);
}

.ptct-search-btn {
  background: linear-gradient(135deg, var(--gold-primary), var(--gold-dim));
  color: var(--bg-deep);
  border: none;
  padding: 10px 22px;
  border-radius: 50px;
  font-family: 'Cinzel', serif;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: all 0.25s;
  box-shadow: 0 2px 12px rgba(212,160,23,0.3);
}
.ptct-search-btn:hover {
  background: linear-gradient(135deg, var(--gold-light), var(--gold-primary));
  box-shadow: 0 4px 20px rgba(212,160,23,0.5);
  transform: translateY(-1px);
}

.ptct-search-hint {
  width: 100%;
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
  margin-top: -6px;
  font-style: italic;
}

/* ─── TREND SELECTOR ─── */
.ptct-trend-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 20px;
}

.ptct-trend-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 50px;
  font-family: 'Crimson Pro', serif;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.ptct-trend-btn:hover,
.ptct-trend-btn.active {
  background: var(--gold-primary);
  color: var(--bg-deep);
  border-color: var(--gold-primary);
  font-weight: 600;
}

/* ─── LEGEND ─── */
.ptct-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 20px;
}

.ptct-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  cursor: pointer;
  padding: 3px 8px;
  border-radius: 20px;
  border: 1px solid transparent;
  transition: all 0.2s;
}
.ptct-legend-item:hover {
  border-color: var(--border-gold);
  background: var(--bg-card);
}
.ptct-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ─── PERIODIC TABLE GRID ─── */
.ptct-table-scroll {
  overflow-x: auto;
  overflow-y: visible;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
}

.ptct-grid {
  display: grid;
  grid-template-columns: repeat(18, minmax(48px, 1fr));
  grid-template-rows: repeat(10, auto);
  gap: 3px;
  min-width: 900px;
  width: 100%;
}

/* ─── ELEMENT CELL ─── */
.ptct-element {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-sm);
  padding: 4px 3px 3px;
  cursor: pointer;
  text-align: center;
  position: relative;
  transition: all 0.2s ease;
  min-height: 54px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
  overflow: hidden;
}

.ptct-element::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--el-color, var(--gold-dim));
  opacity: 0.8;
}

.ptct-element:hover {
  transform: scale(1.12) translateY(-2px);
  z-index: 10;
  border-color: var(--gold-primary);
  box-shadow: 0 6px 24px rgba(0,0,0,0.7), 0 0 12px var(--el-color, rgba(212,160,23,0.4));
}

.ptct-element.highlighted {
  border-color: var(--gold-light) !important;
  box-shadow: 0 0 0 2px var(--gold-light), 0 6px 24px rgba(212,160,23,0.4) !important;
  transform: scale(1.15) translateY(-3px) !important;
  z-index: 11;
}

.ptct-el-number {
  font-size: 8.5px;
  color: var(--text-dim);
  line-height: 1;
  align-self: flex-start;
  padding-left: 3px;
  font-family: 'Cinzel', serif;
}

.ptct-el-symbol {
  font-family: 'Cinzel', serif;
  font-size: clamp(14px, 1.5vw, 18px);
  font-weight: 700;
  color: var(--el-color, var(--gold-primary));
  line-height: 1.1;
  text-shadow: 0 1px 4px rgba(0,0,0,0.5);
}

.ptct-el-name {
  font-size: 8px;
  color: var(--text-secondary);
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  padding: 0 2px;
}

.ptct-el-mass {
  font-size: 7.5px;
  color: var(--text-dim);
  line-height: 1;
}

/* Trend overlay */
.ptct-element.trend-active {
  opacity: 0.5;
}
.ptct-element.trend-active.trend-hl {
  opacity: 1;
  border-color: var(--gold-light) !important;
}

/* ─── PERIOD / GROUP LABELS ─── */
.ptct-period-label,
.ptct-group-label {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Cinzel', serif;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  min-height: 54px;
}

/* ─── LANTHANIDES / ACTINIDES SEPARATOR ─── */
.ptct-separator-row {
  grid-column: 1 / -1;
  height: 12px;
}

.ptct-series-label {
  font-family: 'Cinzel', serif;
  font-size: 8px;
  font-weight: 600;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 4px;
  white-space: nowrap;
  min-height: 54px;
}

/* ─── POPUP MODAL ─── */
.ptct-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(6px);
  z-index: 99999;
  align-items: center;
  justify-content: center;
  padding: 16px;
  box-sizing: border-box;
}
.ptct-overlay.active { display: flex; }

.ptct-popup {
  background: var(--bg-panel);
  border: 1.5px solid var(--border-gold);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card), 0 0 60px rgba(212,160,23,0.2);
  max-width: 680px;
  width: 100%;
  max-height: 92vh;
  overflow-y: auto;
  position: relative;
  animation: ptctPopIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes ptctPopIn {
  from { opacity: 0; transform: scale(0.85) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.ptct-popup-header {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(212,160,23,0.1) 100%);
  border-bottom: 1px solid var(--border-gold);
  padding: 24px 24px 20px;
  position: sticky;
  top: 0;
  z-index: 2;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.ptct-popup-top {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.ptct-popup-symbol-box {
  width: 72px;
  height: 72px;
  background: var(--bg-deep);
  border: 2px solid;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
}

.ptct-popup-symbol-box .num {
  font-family: 'Cinzel', serif;
  font-size: 11px;
  color: var(--text-dim);
  align-self: flex-start;
  padding: 2px 4px;
  position: absolute;
  top: 2px; left: 2px;
}

.ptct-popup-symbol-box .sym {
  font-family: 'Cinzel', serif;
  font-size: 32px;
  font-weight: 900;
  line-height: 1;
}

.ptct-popup-symbol-box .mass-small {
  font-size: 10px;
  color: var(--text-secondary);
}

.ptct-popup-info h2 {
  font-family: 'Cinzel', serif;
  font-size: clamp(20px, 4vw, 28px);
  font-weight: 700;
  color: var(--gold-primary);
  margin: 0 0 6px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

.ptct-popup-category-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-family: 'Cinzel', serif;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.ptct-popup-tagline {
  font-style: italic;
  color: var(--text-secondary);
  font-size: 14px;
}

.ptct-popup-close {
  position: absolute;
  top: 14px; right: 14px;
  background: var(--bg-deep);
  border: 1px solid var(--border-gold);
  color: var(--gold-primary);
  width: 32px; height: 32px;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  line-height: 1;
}
.ptct-popup-close:hover {
  background: var(--gold-primary);
  color: var(--bg-deep);
}

/* ─── POPUP BODY ─── */
.ptct-popup-body {
  padding: 20px 24px 24px;
}

.ptct-props-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-bottom: 20px;
}

.ptct-prop-card {
  background: var(--bg-card);
  border: 1px solid var(--border-green);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  transition: border-color 0.2s;
}
.ptct-prop-card:hover { border-color: var(--border-gold); }

.ptct-prop-label {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 3px;
  font-family: 'Cinzel', serif;
}

.ptct-prop-value {
  font-size: 15px;
  color: var(--gold-light);
  font-weight: 600;
  font-family: 'Crimson Pro', serif;
}

.ptct-prop-unit {
  font-size: 11px;
  color: var(--text-secondary);
  margin-left: 2px;
}

/* ─── TREND BARS ─── */
.ptct-trend-section {
  margin-top: 16px;
}

.ptct-trend-section h4 {
  font-family: 'Cinzel', serif;
  font-size: 13px;
  color: var(--gold-dim);
  margin: 0 0 10px;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border-gold);
  padding-bottom: 6px;
}

.ptct-trend-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.ptct-trend-lbl {
  font-size: 11px;
  color: var(--text-secondary);
  width: 150px;
  flex-shrink: 0;
}

.ptct-trend-bar-track {
  flex: 1;
  height: 8px;
  background: var(--bg-deep);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--border-gold);
}

.ptct-trend-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.6s ease;
}

.ptct-trend-val {
  font-size: 11px;
  color: var(--gold-primary);
  width: 70px;
  text-align: right;
  flex-shrink: 0;
}

/* Electron config display */
.ptct-electron-config {
  font-family: 'Cinzel', serif;
  font-size: 13px;
  color: var(--green-bright);
  background: var(--bg-deep);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-green);
  letter-spacing: 0.04em;
  margin-top: 10px;
  word-break: break-all;
}

.ptct-electron-label {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
  font-family: 'Cinzel', serif;
}

/* Uses section */
.ptct-uses-section {
  margin-top: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-green);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.ptct-uses-section h4 {
  font-family: 'Cinzel', serif;
  font-size: 12px;
  color: var(--gold-dim);
  margin: 0 0 6px;
  letter-spacing: 0.06em;
}
.ptct-uses-text {
  font-size: 13px;
  color: var(--text-white);
  line-height: 1.6;
}

/* ─── TREND INFO PANEL ─── */
.ptct-trend-info {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-top: 16px;
  display: none;
}
.ptct-trend-info.visible { display: block; }
.ptct-trend-info h3 {
  font-family: 'Cinzel', serif;
  font-size: 14px;
  color: var(--gold-primary);
  margin: 0 0 6px;
}
.ptct-trend-info p {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

/* ─── SCROLL BAR ─── */
.ptct-table-scroll::-webkit-scrollbar { height: 6px; }
.ptct-table-scroll::-webkit-scrollbar-track { background: var(--bg-deep); border-radius: 3px; }
.ptct-table-scroll::-webkit-scrollbar-thumb { background: var(--gold-dim); border-radius: 3px; }

.ptct-popup::-webkit-scrollbar { width: 5px; }
.ptct-popup::-webkit-scrollbar-track { background: var(--bg-deep); }
.ptct-popup::-webkit-scrollbar-thumb { background: var(--gold-dim); border-radius: 3px; }

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  #ptct-wrapper { padding: 14px 8px 30px; }
  .ptct-props-grid { grid-template-columns: 1fr 1fr; }
  .ptct-popup-top { flex-direction: column; }
  .ptct-popup-body { padding: 14px 14px 20px; }
  .ptct-popup-header { padding: 16px 14px 14px; }
  .ptct-trend-lbl { width: 110px; font-size: 10px; }
}

@media (max-width: 480px) {
  .ptct-props-grid { grid-template-columns: 1fr; }
  .ptct-popup-symbol-box { width: 60px; height: 60px; }
  .ptct-popup-symbol-box .sym { font-size: 24px; }
  .ptct-legend { display: none; }
  .ptct-legend.show-mobile { display: flex; }
}

/* ─── HELPERS ─── */
.ptct-empty-cell {
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  cursor: default !important;
}
.ptct-empty-cell:hover { transform: none !important; }

.ptct-section-divider {
  text-align: center;
  font-family: 'Cinzel', serif;
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  margin: 10px 0 4px;
  border-top: 1px solid var(--border-gold);
  padding-top: 8px;
}

.ptct-notice {
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
  font-style: italic;
  margin-top: 16px;
}

/* Nav arrows for mobile */
.ptct-scroll-hint {
  text-align: center;
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 6px;
  display: none;
}
@media (max-width: 900px) { .ptct-scroll-hint { display: block; } }