/* ===================================================
   QUANTUMER — styles.css
=================================================== */

:root {
  --bg: #000000;
  --glass: rgba(255,255,255,0.04);
  --glass-hov: rgba(255,255,255,0.08);
  --glass-bd: rgba(255,255,255,0.08);
  --glass-bd-hov: rgba(255,255,255,0.22);
  --accent: #6ee7f7;
  --accent2: #a78bfa;
  --accent3: #f472b6;
  --text: #e2e8f0;
  --text-dim: #64748b;
  --text-muted: #94a3b8;
  --radius: 16px;
  --radius-sm: 8px;
  --glow-b: rgba(110,231,247,0.18);
  --glow-p: rgba(167,139,250,0.18);

  /* Element category colours */
  --c-alkali:          #ff6b6b;
  --c-alkaline:        #ffa94d;
  --c-transition:      #ffd43b;
  --c-post-transition: #69db7c;
  --c-metalloid:       #38d9a9;
  --c-nonmetal:        #74c0fc;
  --c-halogen:         #3bc9db;
  --c-noble:           #cc5de8;
  --c-lanthanide:      #f783ac;
  --c-actinide:        #ff922b;
}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:'Space Grotesk',system-ui,sans-serif;
  min-height:100vh;
  overflow-x:hidden;
  line-height:1.6;
}

/* ── CANVAS ─────────────────────────────────────── */
#bg-canvas{
  position:fixed;top:0;left:0;
  width:100%;height:100%;
  z-index:0;pointer-events:none;
}

/* ── GLASSMORPHISM ──────────────────────────────── */
.glass{
  background:var(--glass);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border:1px solid var(--glass-bd);
  border-radius:var(--radius);
}

/* ── NAVBAR ─────────────────────────────────────── */
#navbar{
  position:fixed;top:0;left:0;right:0;
  z-index:1000;
  background:rgba(0,0,0,0.75);
  backdrop-filter:blur(24px);
  -webkit-backdrop-filter:blur(24px);
  border-bottom:1px solid var(--glass-bd);
  padding:0 1.5rem;
  height:60px;
}
.nav-container{
  max-width:1600px;margin:0 auto;
  height:100%;display:flex;align-items:center;gap:0.75rem;
}
.nav-logo{
  font-size:1.25rem;font-weight:700;
  color:var(--accent);text-decoration:none;
  letter-spacing:-0.5px;white-space:nowrap;flex-shrink:0;
}
.nav-logo span{color:var(--text)}
.nav-toggle{
  display:none;background:none;border:none;
  color:var(--text);font-size:1.35rem;
  cursor:pointer;padding:0.2rem;flex-shrink:0;
}
.nav-links{
  display:flex;list-style:none;
  gap:0.15rem;flex:1;
  overflow-x:auto;scrollbar-width:none;
}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{
  color:var(--text-muted);text-decoration:none;
  font-size:0.78rem;font-weight:500;
  padding:0.3rem 0.55rem;border-radius:6px;
  transition:all .2s;white-space:nowrap;
}
.nav-links a:hover{color:var(--accent);background:rgba(110,231,247,.08)}

/* Search */
.search-wrapper{position:relative;flex-shrink:0}
#searchInput{
  background:var(--glass);
  border:1px solid var(--glass-bd);
  border-radius:24px;
  color:var(--text);font-family:inherit;font-size:.82rem;
  padding:.38rem 1rem;width:210px;outline:none;
  transition:all .25s;
}
#searchInput:focus{border-color:var(--accent);width:250px;box-shadow:0 0 14px var(--glow-b)}
#searchInput::placeholder{color:var(--text-dim)}
.search-dropdown{
  position:absolute;top:calc(100% + 6px);right:0;
  width:320px;max-height:420px;overflow-y:auto;
  background:rgba(4,4,12,.96);
  border:1px solid var(--glass-bd);border-radius:var(--radius-sm);
  backdrop-filter:blur(20px);
  z-index:2000;display:none;
}
.search-dropdown.active{display:block}
.search-item{
  padding:.6rem 1rem;cursor:pointer;
  display:flex;align-items:center;gap:.7rem;
  border-bottom:1px solid rgba(255,255,255,.04);
  transition:background .15s;
}
.search-item:hover{background:var(--glass-hov)}
.si-sym{
  width:34px;height:34px;border-radius:6px;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:.88rem;flex-shrink:0;
}
.si-name{font-size:.83rem;font-weight:600;color:var(--text)}
.si-cat{font-size:.7rem;color:var(--text-muted)}

/* ── SECTIONS ────────────────────────────────────── */
main{position:relative;z-index:1}
.section{
  max-width:1500px;margin:0 auto;
  padding:7rem 2rem 4rem;
}
.fade-section{opacity:0;transform:translateY(28px);transition:opacity .65s ease,transform .65s ease}
.fade-section.visible{opacity:1;transform:translateY(0)}
.section-title{
  font-size:clamp(1.5rem,3vw,2.3rem);
  font-weight:700;margin-bottom:.4rem;color:var(--text);
}
.section-title span{color:var(--accent);font-weight:400;font-size:.65em}
.section-desc{color:var(--text-muted);margin-bottom:2.5rem;font-size:1rem}
.subsection{margin-top:3rem}
.subsection h3{
  font-size:1.2rem;font-weight:600;
  margin-bottom:1.5rem;color:var(--text-muted);
  border-left:3px solid var(--accent);padding-left:.9rem;
}
.subsection h3 span{color:var(--accent2);font-weight:400;font-size:.8em}

/* ── HERO ────────────────────────────────────────── */
.hero-section{
  min-height:100vh;
  display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  text-align:center;padding:0 2rem;
  opacity:1!important;transform:none!important;
}
.hero-content{max-width:820px}
.hero-logo{
  font-size:clamp(3rem,8vw,5.5rem);
  font-weight:700;color:var(--accent);
  margin-bottom:.25rem;
  animation:pulseGlow 3.5s ease-in-out infinite;
}
@keyframes pulseGlow{
  0%,100%{text-shadow:0 0 50px rgba(110,231,247,.45),0 0 100px rgba(110,231,247,.2)}
  50%{text-shadow:0 0 80px rgba(110,231,247,.8),0 0 160px rgba(110,231,247,.35)}
}
.hero-content h1{
  font-size:clamp(2rem,5.5vw,4.5rem);
  font-weight:700;letter-spacing:.18em;margin-bottom:.9rem;
}
.hero-subtitle{
  font-size:clamp(.9rem,1.8vw,1.25rem);
  color:var(--accent);margin-bottom:.9rem;font-weight:500;
}
.hero-desc{
  color:var(--text-muted);font-size:1rem;
  margin:0 auto 2rem;max-width:580px;
}
.hero-btn{
  display:inline-block;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  color:#000;font-weight:700;font-size:.95rem;
  padding:.8rem 2.2rem;border-radius:50px;
  text-decoration:none;transition:all .3s;
  box-shadow:0 0 28px rgba(110,231,247,.3);
}
.hero-btn:hover{transform:translateY(-3px);box-shadow:0 0 48px rgba(110,231,247,.55)}
.hero-scroll-hint{
  position:absolute;bottom:2rem;
  font-size:1.4rem;color:var(--text-dim);
  animation:bounce .8s ease-in-out infinite alternate;
}
@keyframes bounce{from{transform:translateY(0)}to{transform:translateY(6px)}}

/* ── PARTICLE CARDS (generic) ───────────────────── */
.particle-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(195px,1fr));
  gap:1rem;
}
.particle-card{
  background:var(--glass);
  border:1px solid var(--glass-bd);
  border-radius:var(--radius);
  padding:1.4rem 1.2rem;
  cursor:pointer;transition:all .25s;
  position:relative;overflow:hidden;
}
.particle-card::before{
  content:'';position:absolute;
  top:0;left:0;right:0;height:3px;
  background:var(--cc,var(--accent));
  border-radius:var(--radius) var(--radius) 0 0;
}
.particle-card:hover{
  transform:translateY(-5px);
  border-color:var(--glass-bd-hov);
  box-shadow:0 10px 36px rgba(0,0,0,.45),0 0 22px var(--glow-b);
  background:var(--glass-hov);
}
.pc-symbol{font-size:2rem;font-weight:700;color:var(--cc,var(--accent));line-height:1}
.pc-name{font-size:.85rem;font-weight:600;margin-top:.2rem}
.pc-en{font-size:.7rem;color:var(--text-muted);margin-bottom:.7rem}
.pc-props{display:flex;flex-direction:column;gap:.22rem}
.pc-prop{font-size:.74rem;color:var(--text-muted)}
.pc-prop span{color:var(--text)}
.pc-quarks{
  margin-top:.6rem;
  font-size:.75rem;
  background:rgba(255,255,255,.06);
  border-radius:6px;padding:.2rem .5rem;
  color:var(--accent2);font-weight:600;
  display:inline-block;
}
.pc-badge{
  display:inline-block;font-size:.64rem;
  padding:.12rem .4rem;border-radius:4px;
  margin-top:.5rem;font-weight:700;
}
.badge-theoretical{
  background:rgba(167,139,250,.15);
  color:var(--accent2);
  border:1px solid rgba(167,139,250,.3);
}
.badge-unconfirmed{
  background:rgba(255,107,107,.12);
  color:#ff6b6b;
  border:1px solid rgba(255,107,107,.3);
}

/* ── STANDARD MODEL TABLE ───────────────────────── */
#sm-container{
  display:flex;gap:1.5rem;
  align-items:flex-start;flex-wrap:wrap;
}
.sm-group{flex:1;min-width:280px}
.sm-group-label{
  font-size:.75rem;font-weight:700;
  color:var(--text-dim);text-transform:uppercase;
  letter-spacing:.12em;margin-bottom:.6rem;
  padding-left:.3rem;
}
.sm-subgroup-label{
  font-size:.65rem;font-weight:700;
  color:var(--text-dim);text-transform:uppercase;
  letter-spacing:.1em;padding:.3rem .5rem;
}
.sm-gen-row{
  display:grid;
  grid-template-columns:72px repeat(3,1fr);
  gap:4px;margin-bottom:4px;
}
.sm-gen-header{
  display:grid;
  grid-template-columns:72px repeat(3,1fr);
  gap:4px;margin-bottom:2px;
}
.sm-gh-empty{background:transparent;border:none}
.sm-gh-label{
  font-size:.65rem;font-weight:700;
  color:var(--text-dim);text-align:center;
  padding:.2rem;
}
.sm-row-label{
  font-size:.65rem;font-weight:700;
  color:var(--text-dim);
  display:flex;align-items:center;
  padding:0 .5rem;
  border-right:1px solid var(--glass-bd);
}
.sm-cell{
  background:var(--glass);
  border:1px solid var(--glass-bd);
  border-radius:6px;padding:.55rem .4rem;
  cursor:pointer;transition:all .2s;
  text-align:center;position:relative;
  overflow:hidden;
}
.sm-cell::after{
  content:'';position:absolute;
  bottom:0;left:0;right:0;height:2px;
  background:var(--cc,var(--accent));
}
.sm-cell:hover{
  transform:scale(1.07);
  border-color:var(--cc,var(--accent));
  box-shadow:0 0 16px rgba(110,231,247,.2);
  z-index:5;
}
.smc-sym{font-size:1.1rem;font-weight:700;color:var(--cc,var(--accent));line-height:1}
.smc-name{font-size:.6rem;color:var(--text-muted);margin-top:.15rem}
.smc-mass{font-size:.55rem;color:var(--text-dim)}

.sm-bosons{min-width:180px;max-width:220px}
.sm-boson-col{display:flex;flex-direction:column;gap:4px}

/* ── PERIODIC TABLE ──────────────────────────────── */
.pt-controls{
  display:flex;gap:1rem;
  margin-bottom:1rem;flex-wrap:wrap;
}
#ptSearch,#ptFilter{
  background:var(--glass);
  border:1px solid var(--glass-bd);
  border-radius:var(--radius-sm);
  color:var(--text);font-family:inherit;font-size:.82rem;
  padding:.45rem .9rem;outline:none;
  transition:border-color .2s;
}
#ptSearch{flex:1;min-width:140px}
#ptSearch:focus,#ptFilter:focus{border-color:var(--accent)}
#ptFilter option{background:#06060e}
.pt-legend{
  display:flex;flex-wrap:wrap;gap:.5rem;
  margin-bottom:1.2rem;
}
.pt-legend-item{
  display:flex;align-items:center;gap:.35rem;
  font-size:.7rem;color:var(--text-muted);
}
.pt-legend-dot{width:10px;height:10px;border-radius:3px;flex-shrink:0}

.periodic-table{
  display:grid;
  grid-template-columns:repeat(18,minmax(52px,1fr));
  grid-template-rows:repeat(10,auto);
  gap:2px;
  overflow-x:auto;
  padding-bottom:.5rem;
}
.element-cell{
  aspect-ratio:1;
  min-width:52px;
  background:var(--glass);
  border:1px solid rgba(255,255,255,.06);
  border-radius:4px;
  padding:3px 3px 2px;
  cursor:pointer;
  transition:all .18s;
  display:flex;flex-direction:column;
  justify-content:space-between;
  overflow:hidden;position:relative;
}
.element-cell::before{
  content:'';
  position:absolute;inset:0;
  background:var(--ec,var(--accent));
  opacity:.09;
  border-radius:4px;
  transition:opacity .18s;
}
.element-cell:hover::before{opacity:.22}
.element-cell:hover{
  transform:scale(1.18);z-index:10;
  border-color:var(--ec,var(--accent));
  box-shadow:0 4px 20px rgba(0,0,0,.6),0 0 10px var(--ec,var(--accent));
}
.element-cell.dimmed{opacity:.12;pointer-events:none}
.el-num{font-size:.48rem;color:var(--text-dim);line-height:1}
.el-sym{
  font-size:.95rem;font-weight:700;
  color:var(--ec,var(--text));
  text-align:center;line-height:1.1;
}
.el-name{
  font-size:.38rem;color:var(--text-muted);
  text-align:center;overflow:hidden;
  white-space:nowrap;text-overflow:ellipsis;
}
.el-mass{font-size:.38rem;color:var(--text-dim);text-align:center}

/* lanthanide/actinide placeholder cells */
.pt-placeholder{
  background:var(--glass);border:1px solid rgba(255,255,255,.06);
  border-radius:4px;
  display:flex;align-items:center;justify-content:center;
  font-size:.52rem;color:var(--text-dim);
  font-weight:600;text-align:center;
  cursor:default;
}

/* ── FORCES ──────────────────────────────────────── */
.forces-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(270px,1fr));
  gap:1.5rem;
}
.force-card{
  background:var(--glass);border:1px solid var(--glass-bd);
  border-radius:var(--radius);padding:2rem 1.8rem;
  transition:all .25s;position:relative;overflow:hidden;
}
.force-card::before{
  content:'';position:absolute;
  top:0;left:0;right:0;height:3px;
  background:var(--fc,var(--accent));
}
.force-card:hover{
  transform:translateY(-5px);
  box-shadow:0 12px 40px rgba(0,0,0,.4),0 0 20px rgba(110,231,247,.06);
}
.fc-icon{font-size:2.2rem;margin-bottom:.9rem;display:block}
.fc-name{font-size:1.05rem;font-weight:700;margin-bottom:.2rem}
.fc-en{font-size:.78rem;color:var(--text-muted);margin-bottom:1rem}
.fc-props{display:flex;flex-direction:column;gap:.45rem;margin-bottom:1rem}
.fc-prop{font-size:.8rem;color:var(--text-muted)}
.fc-prop strong{color:var(--text)}
.fc-desc{font-size:.8rem;color:var(--text-muted);line-height:1.65}

/* ── EM SPECTRUM ─────────────────────────────────── */
.em-strip{
  display:flex;height:88px;
  border-radius:12px;overflow:hidden;
  margin-bottom:1.5rem;
  box-shadow:0 0 30px rgba(0,0,0,.5);
}
.em-band{
  flex:1;display:flex;align-items:center;justify-content:center;
  font-size:.56rem;font-weight:700;
  color:rgba(255,255,255,.9);
  text-align:center;cursor:pointer;
  transition:all .2s;
  border-right:1px solid rgba(0,0,0,.25);
  padding:.2rem;writing-mode:horizontal-tb;
  user-select:none;
}
.em-band:last-child{border-right:none}
.em-band:hover{filter:brightness(1.35);z-index:2;transform:scaleY(1.12)}
.em-band.em-active{transform:scaleY(1.18);z-index:3;outline:2px solid rgba(255,255,255,.5)}

.em-detail-box{
  background:var(--glass);
  border:1px solid var(--glass-bd);
  border-radius:var(--radius);
  padding:1.5rem;
  min-height:100px;
  animation:fadeIn .3s ease;
}
.em-detail-box h3{font-size:1.1rem;font-weight:700;margin-bottom:.25rem}
.em-detail-box .em-en{font-size:.8rem;color:var(--text-muted);margin-bottom:1rem}
.em-detail-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));
  gap:.75rem;margin-bottom:1rem;
}
.em-detail-prop{
  background:rgba(255,255,255,.04);
  border-radius:var(--radius-sm);padding:.7rem;
}
.edp-label{font-size:.68rem;color:var(--text-muted);font-weight:700;text-transform:uppercase;letter-spacing:.06em;margin-bottom:.2rem}
.edp-val{font-size:.9rem;font-weight:600;color:var(--text)}
.em-uses{font-size:.82rem;color:var(--text-muted);line-height:1.65}

/* ── ANTIMATTER TABLE ────────────────────────────── */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--glass-bd);
  border-radius:var(--radius);margin-top:1rem;
}
.antimatter-table{
  width:100%;border-collapse:collapse;
  font-size:.83rem;min-width:620px;
}
.antimatter-table th{
  background:rgba(255,255,255,.05);
  padding:.7rem 1rem;text-align:left;
  font-weight:700;color:var(--accent);
  border-bottom:1px solid var(--glass-bd);
  white-space:nowrap;
}
.antimatter-table td{
  padding:.6rem 1rem;
  border-bottom:1px solid rgba(255,255,255,.04);
  color:var(--text-muted);
  vertical-align:middle;
}
.antimatter-table td:first-child{color:var(--text);font-weight:600}
.antimatter-table tr:hover td{background:var(--glass)}
.self-anti{color:var(--accent)!important;font-style:italic}
.am-cat-header td{
  background:rgba(255,255,255,.03);
  color:var(--accent2)!important;
  font-weight:700!important;
  font-size:.78rem;text-transform:uppercase;
  letter-spacing:.08em;padding:.5rem 1rem;
}

/* ── ATOM STRUCTURE ──────────────────────────────── */
.atom-layout{
  display:flex;gap:2.5rem;flex-wrap:wrap;
  align-items:flex-start;
}
.atom-svg-wrap{
  flex:0 0 auto;display:flex;
  align-items:center;justify-content:center;
}
.atom-info-panel{flex:1;min-width:280px}
.atom-info-card{
  background:var(--glass);
  border:1px solid var(--glass-bd);
  border-radius:var(--radius);
  padding:1.4rem 1.5rem;margin-bottom:1rem;
}
.atom-info-card h4{
  font-size:.95rem;font-weight:700;
  margin-bottom:.5rem;color:var(--accent);
}
.atom-info-card p{font-size:.82rem;color:var(--text-muted);line-height:1.7}
.atom-info-card .tag{
  display:inline-block;
  font-size:.68rem;font-weight:700;
  padding:.12rem .45rem;border-radius:4px;
  margin:.2rem .2rem 0 0;
  background:rgba(110,231,247,.1);
  color:var(--accent);
  border:1px solid rgba(110,231,247,.2);
}

/* ── RESOURCES ───────────────────────────────────── */
.resource-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(270px,1fr));
  gap:1rem;
}
.resource-card{
  background:var(--glass);
  border:1px solid var(--glass-bd);
  border-radius:var(--radius);
  padding:1.4rem 1.5rem;
  transition:all .25s;
  text-decoration:none;color:inherit;
  display:block;
}
.resource-card:hover{
  transform:translateY(-4px);
  border-color:var(--accent);
  box-shadow:0 8px 28px rgba(0,0,0,.35);
}
.rc-type{
  font-size:.68rem;font-weight:700;
  color:var(--accent);text-transform:uppercase;
  letter-spacing:.08em;margin-bottom:.45rem;
}
.rc-name{font-size:1rem;font-weight:700;margin-bottom:.35rem}
.rc-desc{font-size:.78rem;color:var(--text-muted);line-height:1.55}
.rc-url{
  display:block;margin-top:.6rem;
  font-size:.7rem;color:var(--accent2);
  text-decoration:none;
}

/* ── ABOUT ───────────────────────────────────────── */
.about-card{
  max-width:740px;padding:2.5rem;
  font-size:.95rem;line-height:1.85;
  color:var(--text-muted);
}
.about-card p{margin-bottom:.9rem}
.about-placeholder{color:var(--text-dim);font-style:italic}

/* ── MODAL ───────────────────────────────────────── */
.modal-overlay{
  position:fixed;inset:0;
  background:rgba(0,0,0,.82);
  backdrop-filter:blur(10px);
  z-index:5000;
  display:flex;align-items:center;justify-content:center;
  padding:1rem;
  opacity:0;pointer-events:none;
  transition:opacity .25s;
}
.modal-overlay.active{opacity:1;pointer-events:all}
.modal-box{
  max-width:600px;width:100%;
  max-height:90vh;overflow-y:auto;
  padding:2rem 2rem 1.8rem;
  position:relative;
  animation:slideUp .25s ease;
}
@keyframes slideUp{
  from{transform:translateY(18px);opacity:0}
  to{transform:translateY(0);opacity:1}
}
.modal-close{
  position:absolute;top:1rem;right:1rem;
  background:var(--glass);border:1px solid var(--glass-bd);
  color:var(--text);width:30px;height:30px;
  border-radius:50%;cursor:pointer;
  font-size:.85rem;
  display:flex;align-items:center;justify-content:center;
  transition:all .2s;
}
.modal-close:hover{background:rgba(255,255,255,.1)}

.m-symbol{font-size:3.2rem;font-weight:700;line-height:1;margin-bottom:.3rem}
.m-name{font-size:1.5rem;font-weight:700;margin-bottom:.2rem}
.m-en{font-size:.9rem;color:var(--text-muted);margin-bottom:1.3rem}
.m-props{
  display:grid;grid-template-columns:1fr 1fr;
  gap:.65rem;margin-bottom:1.3rem;
}
.m-prop{
  background:rgba(255,255,255,.04);
  border-radius:var(--radius-sm);padding:.7rem;
}
.mp-label{
  font-size:.65rem;font-weight:700;
  color:var(--text-muted);text-transform:uppercase;
  letter-spacing:.06em;margin-bottom:.2rem;
}
.mp-val{font-size:.88rem;font-weight:600;color:var(--text)}
.m-desc{font-size:.85rem;color:var(--text-muted);line-height:1.7}
.m-badge{
  display:inline-block;font-size:.68rem;font-weight:700;
  padding:.15rem .55rem;border-radius:4px;
  margin-bottom:.75rem;
}

/* ── FOOTER ──────────────────────────────────────── */
footer{
  position:relative;z-index:1;
  text-align:center;padding:2rem;
  color:var(--text-dim);font-size:.78rem;
  border-top:1px solid var(--glass-bd);
  margin-top:4rem;
}

/* ── ANIMATIONS ──────────────────────────────────── */
@keyframes fadeIn{
  from{opacity:0;transform:translateY(8px)}
  to{opacity:1;transform:translateY(0)}
}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes orbit{
  from{transform:rotate(0deg) translateX(var(--r)) rotate(0deg)}
  to{transform:rotate(360deg) translateX(var(--r)) rotate(-360deg)}
}

/* atom animation */
.atom-nucleus{
  width:44px;height:44px;
  background:radial-gradient(circle,#ffd43b,#ff922b);
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:.6rem;font-weight:700;color:#000;
  box-shadow:0 0 20px rgba(255,212,59,.5);
  position:relative;z-index:2;
}
.orbit-ring{
  position:absolute;
  border:1px solid rgba(110,231,247,.25);
  border-radius:50%;
  animation:spin var(--d,4s) linear infinite;
}
.orbit-electron{
  width:8px;height:8px;
  background:var(--accent);
  border-radius:50%;
  box-shadow:0 0 8px var(--accent);
  position:absolute;top:0;left:50%;
  transform:translate(-50%,-50%);
}

/* ── RESPONSIVE ──────────────────────────────────── */
@media(max-width:960px){
  .nav-links{display:none}
  .nav-links.open{
    display:flex;flex-direction:column;
    position:absolute;top:60px;left:0;right:0;
    background:rgba(0,0,0,.97);
    border-bottom:1px solid var(--glass-bd);
    padding:.75rem 1rem;gap:.35rem;z-index:999;
  }
  .nav-toggle{display:block;order:-1}
  .search-wrapper{margin-left:auto}
  #searchInput{width:150px}
  #searchInput:focus{width:190px}
  .section{padding:5rem 1rem 3rem}
  .m-props{grid-template-columns:1fr}
}
@media(max-width:700px){
  .periodic-table{grid-template-columns:repeat(18,minmax(36px,1fr))}
  .element-cell{min-width:36px}
  .el-sym{font-size:.72rem}
  .el-name,.el-mass,.el-num{display:none}
  .em-band{font-size:.48rem}
}
@media(max-width:480px){
  .periodic-table{grid-template-columns:repeat(18,minmax(26px,1fr))}
  .element-cell{min-width:26px;padding:2px 1px}
  .el-sym{font-size:.52rem}
}