:root{--bg-color: #f4f7f6;--card-bg: #ffffff;--header-bg: #1a1b1e;--accent-blue: #3399cc;--accent-orange: #ff9900;--text-primary: #333333;--text-secondary: #666666;--border-color: #d1d9e0;--shadow-soft: 0 1px 3px rgba(0,0,0,.1);--font-main: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: "JetBrains Mono", Courier, monospace;--group-nonmetal: #a0ffa0;--group-noble: #c0ffff;--group-alkali: #ff6666;--group-alkaline-earth: #ffdead;--group-metalloid: #cccc99;--group-halogen: #ffff99;--group-transition: #ffc0cb;--group-post-transition: #cccccc;--group-lanthanide: #ffbfff;--group-actinide: #ff99cc;--group-unknown: #e8e8e8}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-main);background-color:var(--bg-color);color:var(--text-primary);line-height:1.5}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-header{background-color:var(--header-bg);color:#fff;padding:.75rem 2rem;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 10px #0000001a;z-index:100}.brand{display:flex;align-items:center;gap:12px}.nav-logo-icon{width:32px;height:32px;object-fit:contain}.flag-btn{background:transparent;border:1px solid transparent;font-size:1.5rem;cursor:pointer;padding:.2rem .5rem;border-radius:4px;transition:all .2s}.flag-btn.active{background:#ffffff1a;border-color:#fff3}.tab-bar{display:flex;background:#e9ecef;padding:3px;border-radius:8px;gap:2px}.tab-btn{background:transparent;border:none;padding:6px 14px;font-size:.7rem;font-weight:700;color:#6c757d;cursor:pointer;border-radius:6px;transition:all .2s;letter-spacing:.5px}.tab-btn.active{background:#fff;color:var(--accent-blue);box-shadow:0 2px 4px #0000000d}.input-toggle-group{display:flex;background:#e9ecef;padding:2px;border-radius:6px;gap:1px}.toggle-btn{background:transparent;border:none;padding:4px 10px;font-size:.65rem;font-weight:800;color:#6c757d;cursor:pointer;border-radius:4px;transition:all .2s}.toggle-btn.active{background:#fff;color:var(--accent-orange);box-shadow:0 1px 3px #0000001a}.decoded-text-box{font-size:2.5rem;font-weight:300;color:var(--text-primary);letter-spacing:-1px;text-transform:lowercase}.text-result-display{padding:2.5rem;font-family:Inter,system-ui,sans-serif;font-size:1.8rem;font-weight:600;line-height:1.4;color:var(--text-primary);word-break:break-all;text-align:center}.text-result-display .chemical{color:var(--accent-blue);font-weight:800}.copy-container{display:flex;justify-content:center;margin-top:1.5rem}.copy-btn{display:flex;align-items:center;gap:8px;background:#f1f3f5;border:1px solid #dee2e6;padding:8px 16px;border-radius:6px;font-size:.8rem;font-weight:700;color:#495057;cursor:pointer;transition:all .2s}.copy-btn:hover{background:#e9ecef;border-color:#ced4da;transform:translateY(-1px)}.copy-btn svg{width:16px;height:16px}.copy-feedback{position:absolute;bottom:20px;left:50%;transform:translate(-50%);background:#212529;color:#fff;padding:6px 12px;border-radius:4px;font-size:.75rem;font-weight:600;opacity:0;transition:opacity .3s;pointer-events:none}.copy-feedback.show{opacity:1}.brand h1{font-size:1.1rem;font-weight:700;letter-spacing:1px;text-transform:uppercase}.brand h1 span{font-weight:300;opacity:.7}.header-right{display:flex;align-items:center;gap:1.5rem}.app-nav{display:flex;gap:5px}.nav-btn{background:transparent;border:none;color:#999;padding:6px 12px;font-size:.75rem;font-weight:700;cursor:pointer;border-radius:4px;transition:all .2s ease}.nav-btn.active{color:#fff;background:#ffffff1a}.nav-btn:hover{color:#fff}.lang-switcher select{background:transparent;border:1px solid rgba(255,255,255,.2);color:#fff;padding:4px 8px;font-size:.7rem;font-weight:700;border-radius:4px;cursor:pointer}.app-content{flex:1;padding:2rem;max-width:1400px;margin:0 auto;width:100%}.cipher-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:stretch}.cipher-card{background:var(--card-bg);border:1px solid var(--border-color);box-shadow:var(--shadow-soft);display:flex;flex-direction:column;height:calc(100vh - 200px);min-height:500px}.input-card,.output-card{border-radius:6px}.card-title-bar{background:#fdfdfd;border-bottom:2px solid var(--bg-color);padding:1rem 1.5rem;display:flex;justify-content:space-between;align-items:center}.title-content h2{font-size:.85rem;font-weight:800;color:#444;text-transform:uppercase;letter-spacing:.5px}.card-body{flex:1;padding:1.5rem;overflow-y:hidden;position:relative}textarea{width:100%;height:100%;border:none;resize:none;font-family:var(--font-mono);font-size:1rem;color:var(--text-primary);background:transparent;outline:none;overflow:hidden}.machine-status-mini{margin-top:1rem;display:none;align-items:center;gap:8px;font-size:.6rem;font-weight:700;color:#999}.status-indicator{width:6px;height:6px;border-radius:50%;background:#ccc}.status-indicator.active{background:#27ae60}#outputArea{display:flex;flex-wrap:wrap;align-content:flex-start;gap:10px}.element-node{width:70px;height:90px;background:#fff;border:1px solid var(--border-color);border-radius:4px;display:flex;flex-direction:column;position:relative;padding:6px;transition:border-color .2s}.element-node:hover{border-color:var(--accent-blue)}.atomic-number{font-size:.6rem;color:#999;font-weight:700}.symbol-box{flex:1;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:800;font-family:var(--font-mono)}.element-name{font-size:.55rem;text-align:center;color:#666;text-transform:uppercase;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.element-node:after{content:"";position:absolute;bottom:-1px;left:20%;right:20%;height:3px;border-radius:3px 3px 0 0}.element-node.alkali:after{background-color:var(--group-alkali)}.element-node.alkaline-earth:after{background-color:var(--group-alkaline-earth)}.element-node.transition:after{background-color:var(--group-transition)}.element-node.post-transition:after{background-color:var(--group-post-transition)}.element-node.metalloid:after{background-color:var(--group-metalloid)}.element-node.nonmetal:after{background-color:var(--group-nonmetal)}.element-node.halogen:after{background-color:var(--group-halogen)}.element-node.noble:after{background-color:var(--group-noble)}.element-node.lanthanide:after{background-color:var(--group-lanthanide)}.element-node.actinide:after{background-color:var(--group-actinide)}.element-node.unknown:after{background-color:var(--group-unknown)}.element-node.literal{width:35px;border-style:dotted;background:#f9f9f9}.element-node.literal .symbol-box{font-size:1.1rem;color:#999}.about-container{background:#fff;border:1px solid var(--border-color);padding:3rem;border-radius:6px}.about-container h2{font-size:1.5rem;color:var(--text-primary);margin-bottom:2rem}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem}.about-card h3{font-size:1rem;color:var(--accent-blue);margin-bottom:1rem}.hidden{display:none}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#0f172a99;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:2000;opacity:0;pointer-events:none;transition:opacity .3s ease}.modal-overlay.visible{opacity:1;pointer-events:auto}.modal-content{background:#fff;width:90%;max-width:450px;border-radius:24px;padding:2.5rem;position:relative;transform:scale(.9) translateY(20px);transition:transform .4s cubic-bezier(.34,1.56,.64,1);box-shadow:0 25px 50px -12px #00000040}.modal-overlay.visible .modal-content{transform:scale(1) translateY(0)}.modal-close{position:absolute;top:1.5rem;right:1.5rem;background:var(--bg-secondary);border:none;width:36px;height:36px;border-radius:12px;font-size:1.5rem;line-height:1;cursor:pointer;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;transition:all .2s ease}.modal-close:hover{background:#fee2e2;color:#ef4444}.modal-element-header{display:flex;align-items:center;gap:1.5rem;margin-bottom:2rem}.modal-symbol-box{width:80px;height:80px;border-radius:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;font-weight:700;box-shadow:0 10px 15px -3px #0000001a}.modal-symbol-box.alkali{background-color:var(--group-alkali)}.modal-symbol-box.alkaline-earth{background-color:var(--group-alkaline-earth)}.modal-symbol-box.transition{background-color:var(--group-transition)}.modal-symbol-box.post-transition{background-color:var(--group-post-transition)}.modal-symbol-box.metalloid{background-color:var(--group-metalloid)}.modal-symbol-box.nonmetal{background-color:var(--group-nonmetal)}.modal-symbol-box.halogen{background-color:var(--group-halogen)}.modal-symbol-box.noble{background-color:var(--group-noble)}.modal-symbol-box.lanthanide{background-color:var(--group-lanthanide)}.modal-symbol-box.actinide{background-color:var(--group-actinide)}.modal-symbol-box.unknown{background-color:var(--group-unknown)}.modal-symbol-box .m-atomic{font-size:.9rem;margin-bottom:2px}.modal-symbol-box .m-symbol{font-size:2.2rem;line-height:1}.modal-info h2{font-size:1.75rem;margin:0;color:var(--text-primary);text-transform:capitalize}.modal-info p{color:var(--text-secondary);font-size:.95rem;margin:.25rem 0 0}.modal-description{line-height:1.6;color:var(--text-primary);font-size:1.1rem;padding:1.5rem;background:var(--bg-secondary);border-radius:16px}@media(max-width:900px){.cipher-grid{grid-template-columns:1fr}.input-card{border-radius:6px 6px 0 0;height:auto;min-height:200px}.output-card{border-radius:0 0 6px 6px;height:auto;min-height:300px}.cipher-arrow-area{height:auto;padding:.75rem 1rem;border-left:1px solid var(--border-color);border-right:1px solid var(--border-color);flex-direction:row;justify-content:center}.transition-pipe{width:auto;padding:.5rem 1rem;gap:.75rem}.molecule-svg{width:40px;height:40px}.arrow-separator{width:20px}.cipher-pill{font-size:.65rem;padding:3px 8px}.about-grid{grid-template-columns:1fr}.cipher-card{height:auto;min-height:250px}.card-title-bar{flex-wrap:wrap;gap:8px}.tab-bar{width:100%;justify-content:space-between}}@media(max-width:600px){.app-header{flex-direction:column;gap:.75rem;padding:.75rem 1rem}.header-right{width:100%;justify-content:space-between}.app-nav{gap:2px}.nav-btn{padding:5px 8px;font-size:.65rem}.flag-btn{font-size:1.2rem;padding:.1rem .3rem}.app-content{padding:1rem}.text-result-display{font-size:1.2rem;padding:1.5rem 1rem}}.modal-data-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:1.5rem 0}.modal-info-card{background:#ffffff08;padding:10px 14px;border-radius:8px;border:1px solid rgba(255,255,255,.05);display:flex;flex-direction:column;gap:4px}.modal-info-card .label{font-size:.65rem;text-transform:uppercase;color:var(--gold);letter-spacing:1px;font-weight:600}.modal-info-card .value{font-size:.95rem;color:var(--text-primary);font-family:Space Mono,monospace}.modal-description{line-height:1.6;color:var(--text-primary);font-size:1rem;padding:1rem;background:var(--bg-secondary);border-radius:12px;margin-top:1rem;border-left:3px solid var(--gold)}