:root{--bg-dark: var(--cv-bg);--card-bg: var(--cv-surface);--card-border: var(--cv-border);--text-main: var(--cv-text);--accent-cyan: var(--cv-accent);--accent-pink: #b0325f;--valence-color: #e0315a;--inner-color: #1c7ed6}*{box-sizing:border-box;margin:0;padding:0;font-family:Microsoft YaHei,PingFang SC,system-ui,sans-serif;-webkit-tap-highlight-color:transparent}body{background-color:var(--bg-dark);color:var(--text-main);display:flex;flex-direction:column;align-items:center;min-height:100vh;overflow-x:hidden}.app-content{width:100%;display:flex;flex-direction:column;align-items:center}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}button:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent-cyan);outline-offset:3px}.bg-animation{position:fixed;top:0;left:0;width:100%;height:100%;z-index:-1;background:radial-gradient(circle at 50% 50%,rgba(20,30,50,.5) 0%,transparent 50%),linear-gradient(0deg,rgba(0,243,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(0,243,255,.03) 1px,transparent 1px);background-size:100% 100%,40px 40px,40px 40px;will-change:transform}.control-panel{display:flex;flex-wrap:wrap;gap:15px;background:var(--cv-surface);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:12px 15px;border-bottom:1px solid var(--cv-border);box-shadow:var(--cv-shadow-sm);margin-bottom:15px;z-index:100;width:100%;justify-content:center;align-items:center;position:sticky;top:0}.title-box h1{font-size:20px;font-weight:800;text-transform:uppercase;letter-spacing:2px;background:linear-gradient(90deg,var(--cv-text),var(--accent-cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap}.mode-group{display:flex;background:var(--cv-inset);border-radius:8px;padding:4px;gap:4px;flex-wrap:wrap;justify-content:center}.mode-btn{background:transparent;border:1px solid transparent;color:var(--cv-muted);padding:8px 12px;border-radius:5px;cursor:pointer;font-size:13px;transition:.3s;font-weight:500;white-space:nowrap}.mode-btn:hover{color:var(--cv-text);background:var(--cv-raised)}.mode-btn.active{background:var(--accent-cyan);color:var(--cv-accent-ink);font-weight:700;box-shadow:none}.language-toggle{display:flex;gap:4px;justify-content:center;margin:8px 0}.lang-btn{background:transparent;border:1px solid transparent;color:var(--cv-muted);padding:6px 10px;border-radius:5px;cursor:pointer;font-size:12px;transition:.3s;font-weight:500;white-space:nowrap}.lang-btn:hover{color:var(--cv-text);background:var(--cv-raised)}.lang-btn.active{background:var(--accent-cyan);color:var(--cv-accent-ink);font-weight:700;box-shadow:none}.search-box{width:100%;max-width:280px}.search-box input{background:var(--cv-inset);border:1px solid var(--cv-border);color:var(--cv-text);padding:10px 15px;border-radius:8px;outline:none;width:100%;font-size:14px}.search-box input:focus-visible{outline:2px solid var(--accent-cyan);outline-offset:2px;border-color:var(--accent-cyan)}.table-wrapper{width:100%;overflow-x:auto;overflow-y:hidden;padding:10px;-webkit-overflow-scrolling:touch}.periodic-table{display:grid;grid-template-columns:repeat(18,68px);grid-template-rows:repeat(10,76px);gap:5px;margin:0 auto 30px;transition:.5s;width:max-content}.element{--cat: var(--cv-border-strong);background:color-mix(in srgb,var(--cat) 12%,var(--cv-surface));border:1px solid color-mix(in srgb,var(--cat) 34%,var(--cv-surface));color:var(--cv-text);border-radius:6px;position:relative;cursor:pointer;transition:opacity .3s ease,transform .3s ease,border-color .2s,box-shadow .2s,background .2s;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2px;opacity:0;transform:scale(.8);will-change:transform,opacity;font:inherit;text-align:center}.element.visible{opacity:var(--element-opacity, 1);transform:scale(1);will-change:auto}.element:hover{transform:scale(1.15)!important;z-index:100;box-shadow:0 6px 18px color-mix(in srgb,var(--cat) 28%,transparent);border-color:var(--cat);background:color-mix(in srgb,var(--cat) 20%,var(--cv-surface))}.element .atomic-number{position:absolute;top:4px;left:5px;font-size:10px;color:var(--cv-muted);font-variant-numeric:tabular-nums}.element .symbol{font-size:24px;font-weight:700;color:color-mix(in srgb,var(--cat) 45%,var(--cv-text));text-shadow:none;line-height:1.1;margin-top:4px;font-family:Arial,sans-serif}.element .name{font-size:11px;color:var(--cv-text-2);margin-top:0;font-weight:500}.element .detail-val{font-size:9px;line-height:1.1;margin-top:1px;color:var(--cv-text-2);display:none;font-weight:600;font-variant-numeric:tabular-nums;white-space:nowrap}.element.placeholder{border-style:dashed;background:color-mix(in srgb,var(--cat) 6%,var(--cv-surface));justify-content:center;align-items:center;gap:2px}.element.placeholder .range-num{font-size:11px;color:color-mix(in srgb,var(--cat) 55%,var(--cv-text));font-weight:700}.element.placeholder .name{font-size:11px;opacity:.8;margin:0}.element.placeholder:hover{background:color-mix(in srgb,var(--cat) 14%,var(--cv-surface));border-style:solid;transform:scale(1.05)!important}.periodic-table.heatmap-active .element:hover{box-shadow:var(--cv-shadow-sm)}.periodic-table.heatmap-active .element .detail-val{display:block}.legend-wrapper{width:100%;padding:0 10px;margin-bottom:15px}.legend{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;max-width:1000px;margin:0 auto}.legend-item{font-size:12px;display:flex;align-items:center;padding:6px 10px;border-radius:15px;background:var(--cv-inset);cursor:pointer;border:1px solid transparent;transition:.3s;color:inherit;font-family:inherit}.legend-item:hover{background:var(--cv-raised)}.legend-item.active{background:var(--cv-raised);border-color:var(--accent-cyan);box-shadow:none}.legend-color{width:10px;height:10px;border-radius:3px;margin-right:6px;flex-shrink:0}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#1c272159;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:1000;display:flex;justify-content:center;align-items:center;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .3s,visibility 0s linear .3s;padding:10px;contain:layout style}.modal-overlay.open{opacity:1;visibility:visible;pointer-events:all;transition-delay:0s}.hologram-card{width:100%;max-width:1100px;max-height:90vh;background:var(--cv-surface);border:1px solid var(--cv-accent-border);box-shadow:none;border-radius:16px;display:flex;overflow:hidden;position:relative}.close-btn{position:absolute;top:15px;right:15px;font-size:24px;color:var(--cv-text);cursor:pointer;z-index:2000;width:36px;height:36px;background:var(--cv-surface);border-radius:50%;display:flex;align-items:center;justify-content:center;border:1px solid var(--cv-border);transition:all .2s;padding:0;line-height:1}.close-btn:hover{background:#fbecf1;transform:rotate(90deg)}.atom-visualizer{width:30%;min-width:250px;background:radial-gradient(circle at center,#1f6b5510,transparent 70%);display:flex;justify-content:center;align-items:center;perspective:800px;border-right:1px solid var(--cv-border);position:relative;cursor:grab;-webkit-user-select:none;user-select:none;touch-action:none}.atom-visualizer:active{cursor:grabbing}.expand-btn{position:absolute;top:15px;left:15px;width:36px;height:36px;background:var(--cv-accent-soft);border:1px solid var(--cv-accent-border);border-radius:8px;color:var(--accent-cyan);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;z-index:10}.expand-btn:hover{background:var(--cv-selected);border-color:var(--accent-cyan);transform:scale(1.1);box-shadow:none}.expand-btn svg{width:18px;height:18px}.visualizer-hint{position:absolute;bottom:15px;color:var(--cv-subtle);font-size:12px;pointer-events:none}.atom-container{width:200px;height:200px;position:relative;transform-style:preserve-3d;transition:transform .1s linear;will-change:transform}.nucleus{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:12px;height:12px;background:#c27a35;border-radius:50%;box-shadow:none;transform-style:preserve-3d}.orbit-ring{position:absolute;top:50%;left:50%;border-radius:50%;border:1px solid var(--cv-border);transform-style:preserve-3d;will-change:transform}.electron{position:absolute;top:50%;left:50%;border-radius:50%;transform-origin:0 0}.electron.inner{width:5px;height:5px;background:var(--inner-color);box-shadow:0 0 5px var(--inner-color)}.electron.valence{width:8px;height:8px;background:var(--valence-color);box-shadow:0 0 12px var(--valence-color);z-index:10}.electron.expanded.inner{width:8px;height:8px;box-shadow:0 0 10px var(--inner-color)}.electron.expanded.valence{width:12px;height:12px;box-shadow:0 0 20px var(--valence-color)}.info-panel{flex:1;padding:20px 25px;display:flex;flex-direction:column;overflow-y:auto;min-width:0}.header-row{display:flex;align-items:flex-start;gap:15px;margin-bottom:15px;padding-bottom:15px;border-bottom:1px solid var(--cv-border);padding-right:40px}.big-symbol{font-size:52px;font-weight:700;color:color-mix(in srgb,var(--cat, var(--cv-accent)) 50%,var(--cv-text));line-height:1;font-family:Arial,sans-serif}.header-details{flex:1;min-width:0}.big-name{font-size:22px;color:var(--cv-text);font-weight:700;margin-bottom:8px}.en-name{font-size:14px;color:var(--cv-muted);margin-left:8px;font-weight:400}.header-meta{display:flex;flex-wrap:wrap;gap:8px}.category-tag,.phase-tag,.block-tag{padding:4px 10px;border:1px solid var(--cv-border);border-radius:4px;font-size:11px;color:var(--cv-muted);text-transform:uppercase}.category-tag{background:color-mix(in srgb,var(--cat, var(--cv-border-strong)) 12%,var(--cv-surface));border-color:color-mix(in srgb,var(--cat, var(--cv-border-strong)) 45%,var(--cv-surface));color:color-mix(in srgb,var(--cat, var(--cv-border-strong)) 50%,var(--cv-text))}.phase-tag{background:var(--cv-inset)}.block-tag{background:var(--cv-accent-soft);border-color:var(--cv-accent-border);color:var(--accent-cyan);font-weight:700}.summary-box{background:var(--cv-inset);padding:12px 15px;border-radius:8px;margin-bottom:15px;border-left:3px solid var(--cv-accent-border)}.summary-box p{font-size:13px;line-height:1.6;color:var(--cv-text-2)}.tab-nav{display:flex;gap:4px;background:var(--cv-inset);padding:4px;border-radius:8px;margin-bottom:15px}.tab-btn{flex:1;background:transparent;border:none;color:var(--cv-muted);padding:8px 12px;border-radius:5px;cursor:pointer;font-size:12px;transition:.3s;font-weight:500}.tab-btn:hover{color:var(--cv-text);background:var(--cv-raised)}.tab-btn.active{background:var(--accent-cyan);color:var(--cv-accent-ink);font-weight:700}.tab-content{flex:1;overflow-y:auto}.tab-pane{display:none}.tab-pane.active{display:block}.tab-pane[hidden]{display:none}.info-section{margin-bottom:18px}.info-section h3{font-size:12px;color:var(--accent-cyan);margin-bottom:10px;text-transform:uppercase;letter-spacing:1px;border-bottom:1px solid var(--cv-accent-border);padding-bottom:5px}.config-box{background:var(--cv-accent-soft);padding:12px 15px;border-radius:8px;font-family:Courier New,monospace}.config-text{font-size:14px;color:var(--cv-text);letter-spacing:1px;word-break:break-all;line-height:1.5}.config-semantic,.config-shell{font-size:12px;color:var(--cv-muted);margin-top:5px}.props-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.props-grid-4{grid-template-columns:repeat(4,1fr)}.prop-item{background:var(--cv-inset);padding:8px 10px;border-radius:6px;border-left:3px solid var(--cv-accent-border)}.prop-item label{font-size:10px;color:var(--cv-muted);display:block;margin-bottom:3px}.prop-item span{font-size:14px;color:var(--cv-text);font-weight:500}.valence-tags{display:flex;flex-wrap:wrap;gap:8px}.valence-tag{background:#fbecf1;border:1px solid #eab8c9;padding:4px 12px;border-radius:15px;font-size:14px;color:#b0325f;font-weight:600}.isotope-tags{display:flex;flex-wrap:wrap;gap:8px}.isotope-tag{background:#e8f1f9;border:1px solid #bcd6ec;padding:4px 10px;border-radius:4px;font-size:12px;color:#1f6aa5}.isotope-tag .mass-num{font-size:9px;vertical-align:super}.isotope-stable{background:var(--cv-success-soft);border-color:#a9d6b8;color:var(--cv-success)}.appearance-text{font-size:14px;color:var(--cv-text-2);line-height:1.5}.ionization-list{display:flex;flex-direction:column;gap:6px;max-height:200px;overflow-y:auto}.ionization-item{display:flex;justify-content:space-between;align-items:center;padding:6px 10px;background:var(--cv-inset);border-radius:4px}.ion-label{font-size:12px;color:var(--cv-muted)}.ion-value{font-size:13px;color:var(--cv-text);font-weight:500}.history-item{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--cv-border)}.history-item label{font-size:12px;color:var(--cv-muted)}.history-item span{font-size:13px;color:var(--cv-text)}.source-link{display:inline-flex;align-items:center;gap:8px;color:var(--accent-cyan);text-decoration:none;font-size:13px;padding:8px 12px;background:var(--cv-accent-soft);border-radius:6px;transition:.3s}.source-link:hover{background:var(--cv-selected)}.media-container{min-height:100px}.load-media-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;width:100%;padding:25px;background:var(--cv-inset);border:2px dashed var(--cv-border);border-radius:10px;color:var(--cv-muted);cursor:pointer;transition:.3s}.load-media-btn:hover{background:var(--cv-accent-soft);border-color:var(--cv-accent-border);color:var(--accent-cyan)}.load-media-btn.disabled{opacity:.4;cursor:not-allowed}.load-media-btn.disabled:hover{background:var(--cv-inset);border-color:var(--cv-border);color:var(--cv-muted)}.load-media-btn.loading{pointer-events:none;border-color:var(--cv-accent-border);color:var(--accent-cyan)}.load-media-btn.loading svg{animation:spin 1s linear infinite}.load-media-btn.error{border-color:var(--cv-danger);color:var(--cv-danger);cursor:not-allowed}.load-media-btn.error:hover{background:var(--cv-inset);border-color:var(--cv-danger);color:var(--cv-danger)}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.image-display{text-align:center}.image-display img{max-width:100%;max-height:250px;border-radius:8px;object-fit:contain;background:var(--cv-inset)}.image-caption{font-size:11px;color:var(--cv-muted);margin-top:8px;line-height:1.4}.model-viewer{width:100%;height:300px;border-radius:8px;overflow:hidden;background:var(--cv-inset)}.no-data{color:var(--cv-subtle);font-size:13px}.expanded-atom-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#1c272159;-webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px);z-index:2000;display:flex;justify-content:center;align-items:center;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .3s,visibility 0s linear .3s}.expanded-atom-overlay.open{opacity:1;visibility:visible;pointer-events:all;transition-delay:0s}.expanded-atom-card{width:90vw;height:90vh;max-width:900px;max-height:700px;background:var(--cv-surface);border:1px solid var(--cv-accent-border);border-radius:20px;display:flex;flex-direction:column;position:relative;box-shadow:var(--cv-shadow)}.expanded-atom-header{padding:20px 60px 20px 25px;border-bottom:1px solid var(--cv-border);display:flex;align-items:center;gap:15px}.expanded-atom-symbol{font-size:42px;font-weight:700;font-family:Arial,sans-serif;color:color-mix(in srgb,var(--cat, var(--cv-accent)) 50%,var(--cv-text))}.expanded-atom-name{font-size:20px;color:var(--cv-muted)}.expanded-atom-wrapper{flex:1;display:flex;justify-content:center;align-items:center;perspective:1200px;cursor:grab;-webkit-user-select:none;user-select:none;background:radial-gradient(circle at center,#1f6b5510,transparent 60%);position:relative;overflow:hidden;touch-action:none}.expanded-atom-wrapper:active{cursor:grabbing}.expanded-atom-container{width:500px;height:500px;position:relative;transform-style:preserve-3d;transition:transform .1s linear;will-change:transform}.expanded-atom-container .nucleus{width:20px;height:20px;box-shadow:none}.expanded-atom-container .orbit-ring{border-width:2px;border-color:var(--cv-border)}.expanded-atom-info{padding:15px 25px 20px;border-top:1px solid var(--cv-border);display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:15px}.shell-legend{display:flex;flex-wrap:wrap;gap:12px}.shell-legend-item{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--cv-muted);padding:4px 10px;background:var(--cv-inset);border-radius:4px}.shell-legend-item.valence{background:#fbecf1;border:1px solid #eab8c9;color:#b0325f}.shell-dot{width:10px;height:10px;border-radius:50%}.shell-dot.inner{background:var(--inner-color);box-shadow:0 0 6px var(--inner-color)}.shell-dot.valence{background:var(--valence-color);box-shadow:0 0 8px var(--valence-color)}.expanded-hint{color:var(--cv-subtle);font-size:12px}.rotate-hint{display:none;position:fixed;top:0;left:0;right:0;background:var(--cv-accent-soft);border-bottom:1px solid var(--accent-cyan);padding:8px 15px;text-align:center;font-size:12px;color:var(--accent-cyan);z-index:99}@media(max-width:900px){.hologram-card{flex-direction:column;max-height:95vh}.atom-visualizer{width:100%;min-width:auto;height:180px;border-right:none;border-bottom:1px solid var(--cv-border);flex-shrink:0}.atom-container{width:160px;height:160px}.props-grid,.props-grid-4{grid-template-columns:repeat(2,1fr)}.info-panel{padding:15px 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8px}.legend-color{width:8px;height:8px;margin-right:4px}.modal-overlay{padding:0;align-items:flex-end}.hologram-card{max-height:100dvh;height:100dvh;border-radius:16px 16px 0 0}.close-btn{top:10px;right:10px;width:40px;height:40px;background:var(--cv-surface)}.expand-btn{top:10px;left:10px;width:32px;height:32px}.expand-btn svg{width:16px;height:16px}.atom-visualizer{height:160px;min-height:160px}.atom-container{width:140px;height:140px}.visualizer-hint{font-size:11px;bottom:8px}.info-panel{padding:12px 15px 80px}.header-row{margin-bottom:10px;padding-bottom:10px;gap:10px;padding-right:0}.big-symbol{font-size:36px}.big-name{font-size:16px;margin-bottom:6px}.en-name{font-size:12px}.header-meta{gap:5px}.category-tag,.phase-tag,.block-tag{font-size:10px;padding:3px 8px}.summary-box{padding:10px 12px;margin-bottom:12px}.summary-box p{font-size:12px}.tab-nav{margin-bottom:12px}.tab-btn{padding:6px 8px;font-size:11px}.info-section{margin-bottom:15px}.info-section h3{font-size:11px;margin-bottom:8px}.config-box{padding:10px 12px}.config-text{font-size:12px}.props-grid{grid-template-columns:repeat(2,1fr);gap:8px}.props-grid-4{grid-template-columns:repeat(2,1fr)}.prop-item{padding:6px 8px}.prop-item label{font-size:9px}.prop-item span{font-size:12px}.valence-tags,.isotope-tags{gap:6px}.valence-tag{font-size:12px;padding:3px 10px}.isotope-tag{font-size:10px;padding:3px 8px}.load-media-btn{padding:20px}.model-viewer{height:220px}.expanded-atom-card{width:100%;height:100dvh;max-width:none;max-height:none;border-radius:0}.expanded-atom-header{padding:15px 50px 15px 15px}.expanded-atom-symbol{font-size:32px}.expanded-atom-name{font-size:16px}.expanded-atom-container{width:280px;height:280px}.expanded-atom-info{padding:12px 15px 20px;flex-direction:column;gap:10px}.shell-legend{gap:8px}.shell-legend-item{font-size:11px;padding:3px 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10px 2px 2px;border-radius:999px;border:1px solid var(--cv-border);background:var(--cv-surface);font-size:12px;color:var(--cv-text-2);transition:border-color .15s,color .15s}.film-chips button b{width:20px;height:20px;display:grid;place-items:center;border-radius:50%;background:var(--cv-inset);font:600 11px var(--cv-mono);color:var(--cv-muted)}.film-chips button:hover{border-color:#ffb36b}.film-chips button.is-active{border-color:#ffb36b;color:#a8501a}.film-chips button.is-active b{background:#ff9f43;color:#fff}@keyframes story-pop{0%{opacity:0;transform:translateY(8px)}}.learning-app{background:var(--cv-page);background-attachment:fixed}.skip-link{position:fixed;top:-100px;left:20px;z-index:1000;background:var(--cv-accent);color:var(--cv-accent-ink)!important;padding:10px 20px}.skip-link:focus{top:10px}#learning-content{max-width:1180px;margin:0 auto;padding:16px 20px 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solid var(--cv-border);background:#fff;box-shadow:var(--cv-shadow-sm);text-align:left;font-size:.95rem;line-height:1.45;color:var(--cv-text);animation:bubble-float 3s ease-in-out infinite}.home-bubble b{display:block;font-size:.75rem;color:var(--cv-muted)}.home-bubble span{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.home-bubble.is-dad{left:14px;top:14px;border-radius:20px 20px 20px 4px}.home-bubble.is-nian{right:14px;top:92px;border-radius:20px 20px 4px;background:#fff7e6;animation-delay:1.4s}.home-duo{position:relative}.home-planet-actions{position:absolute;z-index:2;right:16px;bottom:16px;display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}.home-go{padding:8px 20px;border-radius:999px;background:var(--cv-accent);color:var(--cv-accent-ink)!important;font-weight:700;box-shadow:var(--cv-shadow-sm)}.home-go:hover{background:var(--cv-accent-hover)}.home-next{padding:8px 16px;border:2px solid 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