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var(--border-color)}.tm-cat-cell{border:none;outline:none;color:#ffffff;cursor:pointer;font-family:var(--font-sans);font-size:clamp(7px,.85vh,10px);padding:1px;text-align:center;display:flex;align-items:center;justify-content:center;transition:opacity .15s ease,filter .15s ease;text-shadow:0 1px 2px rgba(0,0,0,.6)}.tm-cat-cell:hover{filter:brightness(1.25)}.vert-text{writing-mode:vertical-rl;transform:rotate(180deg);font-size:clamp(7px,.85vh,10px);line-height:1;letter-spacing:.5px}.cat-alkali{flex:1;background:var(--c-alkali);border-bottom:1px solid var(--border-color)}.cat-alkaline{flex:1;background:var(--c-alkaline)}.cat-lanthanoids{flex:1;background:var(--c-lanthanoids);border-bottom:1px solid var(--border-color)}.cat-actinoids{flex:1;background:var(--c-actinoids)}.cat-transition{width:44px;background:var(--c-transition);border-right:1px solid var(--border-color)}.cat-post-trans{width:44px;background:var(--c-post-trans)}.cat-metalloid-bar{width:32px;background:var(--c-metalloid);border-right:1px solid var(--border-color)}.tm-nonmetals{flex:1.8}.tm-nonmetals-inner{display:flex;flex:1}.cat-reactive-nonmetal{flex:1;background:var(--c-reactive-nonmetal);border-right:1px solid var(--border-color)}.cat-noble-gas{flex:1;background:var(--c-noble-gas)}.ptable-cells-grid{flex:1;min-width:0;display:grid;grid-template-columns:repeat(18,minmax(0,1fr));grid-template-rows:repeat(7,var(--ptable-row-h));gap:2px}.p-cell{position:relative;border:1px solid rgba(0,0,0,.45);border-radius:2px;padding:clamp(1px,.2vh,2.5px) clamp(2px,.2vw,3.5px);display:grid;grid-template-columns:1fr auto;grid-template-rows:auto 1fr auto auto;align-items:center;cursor:pointer;min-width:0;box-sizing:border-box;transition:background-color .15s ease,border-color .15s ease,box-shadow .2s cubic-bezier(.16,1,.3,1),transform .2s cubic-bezier(.16,1,.3,1),outline .1s 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th,.compare-table td{padding:10px 12px;border:1px solid var(--border-color);font-size:12px}.compare-table th{background:var(--bg-surface-alt);color:var(--text-primary);font-weight:700;width:180px}.compare-table td{color:var(--text-secondary)}.modal-backdrop{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.85);backdrop-filter:blur(8px);z-index:2000;display:flex;align-items:center;justify-content:center;padding:1rem}.modal-card{position:relative;background:var(--bg-surface);border:1px solid var(--border-color);border-radius:8px;box-shadow:var(--shadow-lg);width:100%;max-width:820px;max-height:90vh;overflow-y:auto;padding:2rem;color:var(--text-primary)}.modal-close-btn{position:absolute;top:1rem;right:1rem;background:var(--bg-surface-alt);border:1px solid var(--border-color);color:var(--text-secondary);font-size:20px;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:color .15s 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h3{font-size:13px;font-weight:700;color:var(--primary);margin-bottom:4px}.btn{display:inline-flex;align-items:center;justify-content:center;font-weight:600;font-size:.9rem;line-height:1.4;padding:9px 18px;border-radius:var(--radius-sm);border:1px solid transparent;cursor:pointer;text-decoration:none !important;transition:background-color .15s ease,border-color .15s ease,color .15s ease}.btn-primary{background:#0284c7;border-color:#0369a1;color:#ffffff !important}.btn-primary:hover{background:#0369a1;border-color:#0284c7;color:#ffffff !important}.btn-secondary{background:var(--bg-surface-alt);border-color:var(--border-color);color:var(--text-primary) !important}.btn-secondary:hover{background:var(--border-color);color:var(--text-primary) !important}.btn-sm{padding:5px 10px;font-size:.8rem}.btn-lg{padding:12px 24px;font-size:1rem;font-weight:700}.full-width{width:100%}.site-footer{background:var(--bg-header);border-top:1px solid var(--border-color);margin-top:auto;width:100%;max-width:100%;box-sizing:border-box;overflow:hidden}.footer-top{width:100%;max-width:1680px;margin:0 auto;padding:2.5rem 1rem 1.5rem 1rem;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2rem;box-sizing:border-box}.footer-desc{color:var(--text-secondary);font-size:12.5px;line-height:1.6;margin:10px 0 14px 0}.footer-badges{display:flex;flex-wrap:wrap;gap:6px}.footer-badges .badge{display:inline-block;padding:3px 8px;font-size:11px;font-weight:600;background:var(--bg-surface-alt);border:1px solid var(--border-color);border-radius:3px;color:var(--text-secondary)}.footer-col h4{font-size:12px;font-weight:700;text-transform:uppercase;color:var(--text-primary);margin-bottom:.75rem}.footer-links{list-style:none;display:flex;flex-direction:column;gap:6px;font-size:12px}.footer-links a{color:var(--text-secondary);font-weight:500}.footer-links a:hover{color:var(--primary);text-decoration:underline}.footer-bottom{width:100%;max-width:100%;border-top:1px solid var(--border-subtle);padding:1rem;font-size:12px;color:var(--text-muted);box-sizing:border-box;overflow:hidden}.footer-bottom-inner{width:100%;max-width:1680px;margin:0 auto;display:flex;justify-content:space-between;box-sizing:border-box}.footer-regions-bar{width:100%;max-width:1680px;margin:0 auto .75rem auto;display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;padding-bottom:.75rem;border-bottom:1px solid var(--border-subtle);font-size:11.5px}.footer-regions-title{color:var(--text-muted);font-weight:600}.footer-reg-link{color:var(--text-secondary);font-weight:500;transition:color .15s ease}.footer-reg-link:hover,.footer-reg-link.active{color:var(--primary);text-decoration:underline}.footer-legal-links{display:flex;gap:8px}.footer-legal-links a{color:var(--text-secondary);font-weight:500}.footer-legal-links a:hover{color:var(--primary)}.footer-legal-links a:not(:last-child)::after{content:" •";margin-left:8px;color:var(--text-muted)}@media (max-width:1300px){.footer-top{grid-template-columns:1fr 1fr}}@media (max-width:1024px){.ptable-master-split{flex-direction:column;gap:12px}.ptable-board-area{order:1;width:100%}.ptable-hero-sidebar{order:2;position:static;width:100%;max-width:100%;display:flex;flex-direction:row;align-items:stretch;gap:12px}.hero-tile-box{width:150px;min-width:140px;max-width:160px;aspect-ratio:1 / 1;flex-shrink:0}.sidebar-properties-sheet{flex:1;min-width:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:0;align-content:start}.sp-row{padding:4px 8px;border-right:1px solid var(--border-subtle)}.sp-action-row{grid-column:1 / -1}.bohr-view-container{grid-template-columns:1fr}}@media (max-width:860px){.mobile-toggle-btn{display:flex !important;flex-shrink:0}.main-nav{display:none 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12px;padding:8px;width:100%;max-width:100%;box-sizing:border-box;overflow:hidden}.temp-title{font-size:14px}.temp-step-btn{width:32px;height:32px;font-size:18px}.temp-slider-container{flex:1;min-width:140px}.temp-values-triple{width:100%;margin-left:0;justify-content:center;gap:16px;padding-top:6px;border-top:1px solid var(--border-subtle)}.temp-num-input{width:48px;font-size:16px}.temp-unit-tag{font-size:15px}.mobile-table-quick-nav{display:flex;flex-direction:column;gap:6px;margin:6px 0 4px 0;background:var(--bg-surface);border:1px solid var(--border-color);border-radius:4px;padding:6px 8px;width:100%;max-width:100%;box-sizing:border-box;overflow:hidden}.mtq-hint{display:flex;align-items:center;justify-content:center;gap:6px;font-size:11px;color:var(--text-secondary);font-weight:600}.mtq-chips{display:flex;gap:4px;overflow-x:auto;-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain;padding-bottom:2px;width:100%;max-width:100%;box-sizing:border-box}.mtq-chip{flex:1;min-width:76px;padding:5px 6px;background:var(--bg-surface-alt);border:1px solid var(--border-color);border-radius:3px;color:var(--text-primary);font-size:10.5px;font-weight:600;cursor:pointer;white-space:nowrap;text-align:center}.mtq-chip:active,.mtq-chip:hover{background:#0284c7;border-color:#0369a1;color:#ffffff}.mobile-table-scrollbar-container{display:flex !important;flex-direction:column;gap:6px;margin:8px 0 14px 0;background:var(--bg-surface);border:1px solid var(--border-color);border-radius:6px;padding:8px 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rgba(56,189,248,.6);cursor:grab}.mts-range-slider::-webkit-slider-thumb:active{cursor:grabbing;transform:scale(1.08)}.mts-range-slider::-moz-range-thumb{width:44px;height:22px;border-radius:11px;background:linear-gradient(135deg,#38bdf8,#2563eb);border:2px solid #ffffff;box-shadow:0 2px 8px rgba(0,0,0,.8);cursor:grab}.ptable-board-scroll{overflow-x:auto !important;-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain;touch-action:pan-x pan-y;padding-bottom:8px;scrollbar-width:thin !important;scrollbar-color:#38bdf8 #161616 !important;width:100% !important;max-width:100% !important;min-width:0 !important;box-sizing:border-box !important}.ptable-board-scroll::-webkit-scrollbar{display:block !important;height:10px !important}.ptable-board-scroll::-webkit-scrollbar-track{background:#121212 !important;border:1px solid #262626 !important;border-radius:5px !important;margin:0 4px !important}.ptable-board-scroll::-webkit-scrollbar-thumb{background:linear-gradient(90deg,#2563eb,#38bdf8) !important;border-radius:5px !important;border:2px solid #121212 !important}.ptable-board-scroll::-webkit-scrollbar-thumb:hover,.ptable-board-scroll::-webkit-scrollbar-thumb:active{background:#38bdf8 !important}.ptable-board-canvas{min-width:780px}.ptable-cells-grid{grid-template-rows:repeat(7,58px)}.ptable-periods-column{grid-template-rows:repeat(7,58px)}.f-series-row{height:58px}.p-cell{padding:2px}.p-cell-top,.p-cell-num{font-size:9.5px}.p-cell-symbol{font-size:16px}.p-cell-name{font-size:8px}.p-cell-weight{display:none}.ptable-center-hollow{grid-template-columns:105px 85px 1fr;gap:4px;padding:2px}.gk-sample-cell{width:48px;height:58px}.gk-labels-stack{height:58px;font-size:9.5px}.toolbar-tabs{overflow-x:auto;-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain;flex-wrap:nowrap;padding-bottom:4px;width:100%;max-width:100%;box-sizing:border-box}.tool-tab-btn{flex-shrink:0;white-space:nowrap}.bohr-canvas-box{width:100%;overflow:hidden}#largeBohrCanvas{max-width:100%;height:auto}.compounds-grid{grid-template-columns:1fr;width:100%;max-width:100%;box-sizing:border-box}.isotopes-container{flex-direction:column;width:100%;max-width:100%;box-sizing:border-box}.modal-card{padding:1.25rem 1rem;max-height:94vh;width:95%;max-width:95%;box-sizing:border-box}.modal-hero{flex-direction:column;align-items:flex-start;gap:1rem}.modal-props-grid{grid-template-columns:1fr !important}.site-footer{width:100%;max-width:100%;box-sizing:border-box;overflow:hidden}.footer-top{grid-template-columns:1fr !important;gap:1.5rem;text-align:center;padding:1.5rem 1rem 1rem 1rem;width:100% !important;max-width:100% !important;box-sizing:border-box !important;overflow:hidden}.footer-links{align-items:center}.footer-bottom{width:100%;max-width:100%;box-sizing:border-box;overflow:hidden}.footer-bottom-inner{flex-direction:column;gap:8px;text-align:center;align-items:center;width:100%;max-width:100%;box-sizing:border-box}.footer-legal-links{justify-content:center;flex-wrap:wrap}}@media (max-width:480px){.brand-logo{height:22px;max-width:110px}.header-search{max-width:125px;min-width:0}.search-input{font-size:11px;padding:0 20px 0 24px}.action-btn{padding:0 4px;height:26px}.lang-code{display:none}.sidebar-properties-sheet{grid-template-columns:1fr}.ptable-board-canvas{min-width:750px}}[data-theme="light"]{color-scheme:light}[data-theme="light"] .p-cell{border-color:rgba(0,0,0,.25)}[data-theme="light"] .p-cell:hover{outline:2px solid #0f172a;box-shadow:0 4px 12px rgba(0,0,0,.25)}[data-theme="light"] .p-cell.selected{outline:2px solid #0284c7;box-shadow:0 0 0 2px #bae6fd}[data-theme="light"] .hero-tile-box{border-color:rgba(15,23,42,.2);box-shadow:0 4px 14px rgba(0,0,0,.15)}[data-theme="light"] .modal-backdrop{background:rgba(15,23,42,.65)}[data-theme="light"] .bohr-canvas-box{background:#090d16}[data-theme="light"] .temp-step-btn{background:#e2e8f0;border-color:#cbd5e1;color:#0f172a}[data-theme="light"] .temp-step-btn:hover{background:#cbd5e1;color:#0f172a}[data-theme="light"] .mobile-toggle-btn span{background:#0f172a}[data-theme="light"] .ptable-footnote{color:#334155}[data-theme="light"] .sm-box.solid-box{background:#ffffff;color:#0f172a !important;border-color:rgba(15,23,42,.4)}[data-theme="light"] .sm-box.liquid-box{background:#ffffff;color:#0284c7 !important;border-color:rgba(2,132,199,.6)}[data-theme="light"] .sm-box.gas-box{background:#ffffff;color:#dc2626 !important;border-color:rgba(220,38,38,.6)}[data-theme="light"] .sm-box.unknown-box{background:#ffffff;color:#64748b !important;border-color:rgba(100,116,139,.4)}.ptable-seo-article{width:100%;max-width:1200px;margin:36px auto 24px auto;padding:32px 28px;background:var(--bg-card,#131d31);border:1px solid var(--border-color,rgba(255,255,255,.08));border-radius:14px;box-shadow:0 8px 24px rgba(0,0,0,.25);color:var(--text-primary,#f1f5f9);font-family:var(--font-main,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif);line-height:1.7;box-sizing:border-box}.psa-header{margin-bottom:24px;border-bottom:1px solid var(--border-color,rgba(255,255,255,.08));padding-bottom:18px}.psa-badge{display:inline-block;padding:3px 10px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;background:rgba(56,189,248,.15);color:#38bdf8;border:1px solid rgba(56,189,248,.35);border-radius:999px;margin-bottom:10px}.psa-title{font-size:clamp(1.4rem,2.5vw,2.1rem);font-weight:700;line-height:1.3;margin:0 0 10px 0;color:#f8fafc}.psa-lead{font-size:1.05rem;color:var(--text-secondary,#94a3b8);margin:0}.psa-section{margin-top:28px}.psa-section h3{font-size:1.3rem;font-weight:700;color:#38bdf8;margin:0 0 12px 0;display:flex;align-items:center;gap:8px}.psa-section p{font-size:.96rem;color:var(--text-secondary,#cbd5e1);margin:0 0 14px 0}.psa-section ul{margin:10px 0 16px 20px;padding:0;color:var(--text-secondary,#cbd5e1);font-size:.95rem}.psa-section li{margin-bottom:8px;line-height:1.6}.psa-section strong{color:#f8fafc}.psa-callout{background:rgba(56,189,248,.08);border-left:4px solid #38bdf8;padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0}.psa-callout p{margin:0;font-size:.95rem;color:#e2e8f0}.psa-table-wrap{overflow-x:auto;margin:20px 0;border-radius:8px;border:1px solid var(--border-color,rgba(255,255,255,.08))}.psa-periods-table{width:100%;border-collapse:collapse;font-size:.9rem;text-align:left}.psa-periods-table th{background:rgba(15,23,42,.6);color:#38bdf8;font-weight:600;padding:10px 14px;border-bottom:1px solid var(--border-color,rgba(255,255,255,.1));white-space:nowrap}.psa-periods-table td{padding:10px 14px;border-bottom:1px solid var(--border-color,rgba(255,255,255,.05));color:#cbd5e1}.psa-periods-table tr:last-child td{border-bottom:none}.psa-periods-table tr:hover td{background:rgba(255,255,255,.03)}.psa-mono{font-family:var(--font-mono,monospace);font-size:.85rem;color:#93c5fd}.psa-faq-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(440px,1fr));gap:18px;margin-top:18px}@media (max-width:640px){.psa-faq-grid{grid-template-columns:1fr}}.psa-faq-card{background:rgba(15,23,42,.45);border:1px solid var(--border-color,rgba(255,255,255,.08));border-radius:10px;padding:20px;transition:transform .2s ease,border-color .2s ease}.psa-faq-card:hover{border-color:rgba(56,189,248,.4);transform:translateY(-2px)}.psa-faq-q{font-size:1.05rem;font-weight:700;color:#f8fafc;margin:0 0 10px 0;display:flex;align-items:flex-start;gap:10px;line-height:1.4}.psa-faq-q::before,.psa-faq-q-icon{content:"?";display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:50%;background:rgba(56,189,248,.2);color:#38bdf8;font-size:.8rem;font-weight:800;flex-shrink:0;margin-top:1px}.psa-faq-a{font-size:.93rem;color:var(--text-secondary,#94a3b8);line-height:1.65;margin:0}.psa-faq-a p{margin:0 0 8px 0}.psa-faq-a p:last-child{margin-bottom:0}.psa-faq-a ul{margin:6px 0 10px 18px;padding:0;color:#cbd5e1}.psa-faq-a li{margin-bottom:5px}[data-theme="light"] .ptable-seo-article{background:#ffffff;border-color:#e2e8f0;box-shadow:0 6px 20px rgba(0,0,0,.06);color:#1e293b}[data-theme="light"] .psa-header{border-bottom-color:#e2e8f0}[data-theme="light"] .psa-title{color:#0f172a}[data-theme="light"] .psa-lead{color:#475569}[data-theme="light"] .psa-section h3{color:#0284c7}[data-theme="light"] .psa-section p{color:#334155}[data-theme="light"] .psa-section ul{color:#334155}[data-theme="light"] .psa-section strong{color:#0f172a}[data-theme="light"] .psa-callout{background:#f0f9ff;border-left-color:#0284c7}[data-theme="light"] .psa-callout p{color:#0c4a6e}[data-theme="light"] .psa-table-wrap{border-color:#e2e8f0}[data-theme="light"] .psa-periods-table th{background:#f8fafc;color:#0369a1;border-bottom-color:#cbd5e1}[data-theme="light"] .psa-periods-table td{color:#334155;border-bottom-color:#f1f5f9}[data-theme="light"] .psa-periods-table tr:hover td{background:#f8fafc}[data-theme="light"] .psa-mono{color:#0369a1}[data-theme="light"] .psa-faq-card{background:#f8fafc;border-color:#e2e8f0}[data-theme="light"] .psa-faq-card:hover{border-color:#0284c7}[data-theme="light"] .psa-faq-q{color:#0f172a}[data-theme="light"] .psa-faq-q::before,[data-theme="light"] .psa-faq-q-icon{background:#e0f2fe;color:#0284c7}[data-theme="light"] .psa-faq-a{color:#475569}[data-theme="light"] .psa-faq-a ul{color:#334155}.psa-figure{margin:22px auto;max-width:860px;text-align:center}.psa-figure-compact{margin:16px auto 14px auto;max-width:100%}.psa-figure picture{display:block;width:100%;border-radius:10px;overflow:hidden;background:#0f172a;border:1px solid var(--border-color,rgba(255,255,255,.1));box-shadow:0 4px 16px rgba(0,0,0,.25)}.psa-figure-img{display:block;width:100%;height:auto;aspect-ratio:16 / 9;object-fit:cover;transition:transform .3s ease}.psa-figure:hover .psa-figure-img{transform:scale(1.015)}.psa-figcaption{margin-top:10px;font-size:.85rem;color:var(--text-secondary,#94a3b8);font-style:italic;line-height:1.5}[data-theme="light"] .psa-figure picture{background:#f1f5f9;border-color:#cbd5e1;box-shadow:0 4px 16px rgba(0,0,0,.08)}[data-theme="light"] .psa-figcaption{color:#64748b}.psa-regional-callout{border-left:4px solid #0284c7;background:rgba(2,132,199,.08);margin:1.25rem 0;padding:1rem 1.25rem;border-radius:0 8px 8px 0}[data-theme="light"] .psa-regional-callout{background:#f0f9ff;border-left-color:#0284c7}@media print{.site-header,.footer-top,.footer-regions-bar,.header-actions,.header-search,.ptable-temperature-row,.ptable-subtabs-nav,.toolbar-options,.ehc-close-btn,.modal-backdrop,.skip-link{display:none !important}body{background:#ffffff !important;color:#000000 !important;font-size:10pt}.ptable-application-container{padding:0 !important;width:100% !important}.ptable-master-split{display:block !important}.ptable-hero-sidebar{display:none !important}.ptable-board-area{width:100% !important}.ptable-cells-grid{gap:1px !important}.p-cell{border:1px solid #999999 !important;page-break-inside:avoid}.ptable-seo-article{margin-top:2rem !important;page-break-before:always;border:none !important;box-shadow:none !important;background:transparent !important}}