/* =====================================================
   Periodic Table Explorer — style.css
===================================================== */

/* ---- Hero ---- */
.hero {
  background: linear-gradient(135deg, var(--brand-navy) 0%, #1a3a5c 60%, #0d2137 100%);
  padding: 3rem 1rem 2.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(255,107,0,0.15) 0%, transparent 65%);
  pointer-events: none;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
  position: relative;
}
.hero-title span { color: var(--brand-saffron); }
.hero-sub {
  color: rgba(255,255,255,0.7);
  font-size: 1rem;
  margin-bottom: 1.5rem;
  position: relative;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 1.5rem;
  position: relative;
}
.hero-badge {
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.85);
  padding: 5px 14px;
  border-radius: var(--r-pill);
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid rgba(255,255,255,0.15);
}
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; position: relative; }

/* ---- Game Mode Cards ---- */
.game-modes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  padding: 1.5rem 0;
}
.mode-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.2rem 1rem;
  text-align: center;
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--t-mid);
  cursor: pointer;
  display: block;
}
.mode-card:hover {
  border-color: var(--brand-saffron);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.mode-icon { font-size: 2.2rem; margin-bottom: 8px; }
.mode-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.mode-desc { font-size: 0.75rem; color: var(--text-muted); line-height: 1.4; }

/* ---- Filter Bar ---- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 1rem 0;
  margin-bottom: 0.5rem;
}
.filter-btn {
  padding: 5px 14px;
  border-radius: var(--r-pill);
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--t-fast);
  white-space: nowrap;
}
.filter-btn:hover { border-color: var(--brand-saffron); color: var(--brand-saffron); }
.filter-btn.active { background: var(--brand-saffron); border-color: var(--brand-saffron); color: #fff; }
.search-box {
  margin-left: auto;
  position: relative;
  flex-shrink: 0;
}
.search-box input {
  padding: 6px 14px 6px 36px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-card);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  width: 200px;
  transition: all var(--t-fast);
  outline: none;
}
.search-box input:focus { border-color: var(--brand-saffron); width: 240px; }
.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
  pointer-events: none;
}

/* ---- Periodic Table Grid ---- */
.pt-wrapper {
  overflow-x: auto;
  padding-bottom: 1rem;
  -webkit-overflow-scrolling: touch;
}
.periodic-table {
  display: grid;
  grid-template-columns: repeat(18, 1fr);
  gap: 3px;
  min-width: 900px;
}
.element-cell {
  aspect-ratio: 1;
  border-radius: 6px;
  padding: 4px 3px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all var(--t-fast);
  border: 1.5px solid transparent;
  position: relative;
  min-width: 0;
  user-select: none;
}
.element-cell:hover {
  transform: scale(1.15);
  z-index: 10;
  box-shadow: var(--shadow-md);
}
.element-cell .at-num {
  font-size: 0.5rem;
  opacity: 0.7;
  line-height: 1;
}
.element-cell .symbol {
  font-family: var(--font-display);
  font-size: clamp(0.7rem, 1.2vw, 1rem);
  font-weight: 700;
  line-height: 1.1;
}
.element-cell .el-name {
  font-size: 0.38rem;
  opacity: 0.75;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
  line-height: 1;
}
.element-cell .el-mass {
  font-size: 0.35rem;
  opacity: 0.6;
  line-height: 1;
}

/* Category-based cell colors */
.cat-alkali         { background: var(--c-alkali-bg);          border-color: var(--c-alkali);          color: var(--text-primary); }
.cat-alkaline       { background: var(--c-alkaline-bg);        border-color: var(--c-alkaline);        color: var(--text-primary); }
.cat-lanthanide     { background: var(--c-lanthanide-bg);      border-color: var(--c-lanthanide);      color: var(--text-primary); }
.cat-actinide       { background: var(--c-actinide-bg);        border-color: var(--c-actinide);        color: var(--text-primary); }
.cat-transition     { background: var(--c-transition-bg);      border-color: var(--c-transition);      color: var(--text-primary); }
.cat-post           { background: var(--c-post-transition-bg); border-color: var(--c-post-transition); color: var(--text-primary); }
.cat-metalloid      { background: var(--c-metalloid-bg);       border-color: var(--c-metalloid);       color: var(--text-primary); }
.cat-nonmetal       { background: var(--c-nonmetal-bg);        border-color: var(--c-nonmetal);        color: var(--text-primary); }
.cat-halogen        { background: var(--c-halogen-bg);         border-color: var(--c-halogen);         color: var(--text-primary); }
.cat-noble          { background: var(--c-noble-bg);           border-color: var(--c-noble);           color: var(--text-primary); }

.element-cell.dimmed { opacity: 0.18; }
.element-cell.highlighted { transform: scale(1.12); box-shadow: 0 0 0 3px var(--brand-saffron); z-index: 5; }
.element-cell.bookmarked::after {
  content: '★';
  position: absolute;
  top: 1px; right: 2px;
  font-size: 0.4rem;
  color: var(--brand-gold);
}

/* Lanthanide / Actinide placeholder row */
.pt-spacer {
  grid-column: 3 / span 15;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.55rem;
  color: var(--text-muted);
  opacity: 0.6;
  padding: 3px;
}

/* Legend */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 1rem 0 0.5rem;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 600;
}
.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ---- Element Detail Modal ---- */
.el-modal-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.el-symbol-big {
  width: 72px;
  height: 72px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.el-symbol-big .num { font-size: 0.7rem; opacity: 0.8; }
.el-symbol-big .sym {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}
.el-symbol-big .nm { font-size: 0.65rem; opacity: 0.8; }
.el-modal-title { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; }
.el-modal-sub { color: var(--text-secondary); font-size: 0.85rem; margin-top: 2px; }

.el-props {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 1.2rem;
}
.el-prop {
  background: var(--bg-card2);
  border-radius: var(--r-sm);
  padding: 10px 12px;
}
.el-prop-label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; font-weight: 700; margin-bottom: 2px; }
.el-prop-value { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); }

.el-uses { margin-bottom: 1rem; }
.el-uses-title { font-size: 0.8rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
.el-use-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.el-use-tag {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 3px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.el-funfact {
  background: linear-gradient(135deg, rgba(255,107,0,0.08), rgba(255,193,7,0.08));
  border: 1px solid rgba(255,107,0,0.2);
  border-radius: var(--r-md);
  padding: 12px 14px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.el-funfact strong { color: var(--brand-saffron); }

.el-modal-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Stats bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 10px;
  margin-bottom: 1.5rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 12px;
  text-align: center;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--brand-saffron);
  line-height: 1;
}
.stat-label { font-size: 0.72rem; color: var(--text-muted); font-weight: 600; margin-top: 3px; }

@media (max-width: 600px) {
  .el-props { grid-template-columns: 1fr 1fr; }
  .filter-bar { gap: 6px; }
  .search-box input { width: 140px; }
  .search-box input:focus { width: 160px; }
  .game-modes { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .mode-icon { font-size: 1.6rem; }
  .mode-title { font-size: 0.85rem; }
  .mode-desc { display: none; }
}