:root{--bg-primary: #f5f5f5;--bg-secondary: #ffffff;--bg-tertiary: #e8e8e8;--text-primary: #1a1a1a;--text-secondary: #666666;--text-tertiary: #999999;--border-color: #e0e0e0;--accent-color: #2563eb;--accent-hover: #1d4ed8;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .1);--transition: all .2s ease}body.dark-mode{--bg-primary: #1a1a1a;--bg-secondary: #2a2a2a;--bg-tertiary: #333333;--text-primary: #f5f5f5;--text-secondary: #cccccc;--text-tertiary: #999999;--border-color: #404040;--accent-color: #3b82f6;--accent-hover: #2563eb;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;transition:background-color .3s ease,color .3s ease;min-height:100vh;display:flex;flex-direction:column}.container{max-width:1200px;margin:0 auto;padding:0 20px;width:100%}header{background-color:var(--bg-secondary);box-shadow:var(--shadow-sm);padding:1rem 0;position:sticky;top:0;z-index:100;transition:var(--transition)}.header-content{display:flex;justify-content:space-between;align-items:center}header h1{font-size:1.75rem;font-weight:600;color:var(--text-primary)}.dark-mode-toggle{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:8px;width:44px;height:44px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition)}.dark-mode-toggle:hover{background:var(--accent-color);border-color:var(--accent-color)}.dark-mode-toggle:hover svg{color:#fff}.dark-mode-toggle svg{color:var(--text-primary);transition:var(--transition)}.sun-icon{display:none}.moon-icon,body.dark-mode .sun-icon{display:block}body.dark-mode .moon-icon{display:none}main{flex:1;padding:2rem 0}.intro{text-align:center;margin-bottom:2rem}.intro p{color:var(--text-secondary);font-size:1.1rem;max-width:800px;margin:0 auto}.ad-banner{margin:2rem 0;min-height:90px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--text-tertiary);font-size:.875rem}.main-layout{display:grid;grid-template-columns:1fr 300px;gap:2rem;align-items:start}.converter-section{flex:1}.category-tabs{display:flex;gap:.5rem;margin-bottom:2rem;flex-wrap:wrap;background:var(--bg-secondary);padding:.5rem;border-radius:12px;box-shadow:var(--shadow-sm)}.tab-btn{flex:1;min-width:100px;padding:.75rem 1.25rem;background:transparent;border:none;border-radius:8px;font-size:.95rem;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:var(--transition)}.tab-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}.tab-btn.active{background:var(--accent-color);color:#fff}.converter-card{background:var(--bg-secondary);padding:2rem;border-radius:12px;box-shadow:var(--shadow-md);margin-bottom:2rem}.converter-row{display:grid;grid-template-columns:1fr auto 1fr;gap:1.5rem;align-items:end;margin-bottom:2rem}.input-group{display:flex;flex-direction:column;gap:.5rem}.input-group label{font-size:.875rem;font-weight:500;color:var(--text-secondary)}.input-group input,.input-group select{padding:.875rem;border:1px solid var(--border-color);border-radius:8px;background:var(--bg-primary);color:var(--text-primary);font-size:1rem;font-family:inherit;transition:var(--transition)}.input-group input:focus,.input-group select:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px #2563eb1a}.input-group input[readonly]{background:var(--bg-tertiary);cursor:default}.swap-btn{width:48px;height:48px;padding:0;background:var(--accent-color);border:none;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);box-shadow:var(--shadow-sm)}.swap-btn svg{color:#fff}.swap-btn:hover{background:var(--accent-hover);transform:rotate(180deg)}.result-section{background:var(--bg-primary);padding:1.5rem;border-radius:8px;border:1px solid var(--border-color)}.result-display{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.75rem}#resultText{font-size:1.25rem;font-weight:500;color:var(--text-primary);flex:1}.copy-btn{width:36px;height:36px;padding:0;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:6px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition)}.copy-btn:hover{background:var(--accent-color);border-color:var(--accent-color)}.copy-btn:hover svg{color:#fff}.copy-btn svg{color:var(--text-secondary);transition:var(--transition)}.formula-text{font-size:.875rem;color:var(--text-secondary);font-style:italic}.formulas-section{margin-top:3rem}.formulas-section h2{font-size:1.5rem;margin-bottom:1.5rem;color:var(--text-primary)}.formulas-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem}.formula-item{background:var(--bg-secondary);padding:1.25rem;border-radius:8px;border:1px solid var(--border-color);transition:var(--transition)}.formula-item:hover{border-color:var(--accent-color);box-shadow:var(--shadow-md)}.formula-item-title{font-size:.875rem;font-weight:600;color:var(--accent-color);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem}.formula-item-content{font-size:.95rem;color:var(--text-primary);line-height:1.5;font-family:Courier New,monospace}.formula-item-content strong{font-weight:600}.sidebar-ad{position:sticky;top:100px}.sidebar-ad .ad-banner{min-height:600px}footer{background:var(--bg-secondary);padding:2rem 0;margin-top:4rem;border-top:1px solid var(--border-color)}footer .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}footer p{color:var(--text-secondary);font-size:.875rem}footer nav a{color:var(--accent-color);text-decoration:none;font-size:.875rem;transition:var(--transition)}footer nav a:hover{color:var(--accent-hover);text-decoration:underline}@media (max-width: 1024px){.main-layout{grid-template-columns:1fr}.sidebar-ad{position:static}.sidebar-ad .ad-banner{min-height:250px}}@media (max-width: 768px){header h1{font-size:1.5rem}.converter-row{grid-template-columns:1fr;gap:1rem}.swap-btn{transform:rotate(90deg)}.swap-btn:hover{transform:rotate(270deg)}.converter-card{padding:1.5rem}.category-tabs{gap:.25rem}.tab-btn{min-width:80px;padding:.625rem .75rem;font-size:.875rem}.conversion-cards{grid-template-columns:1fr}footer .container{flex-direction:column;text-align:center}}@media (max-width: 480px){.intro p,#resultText{font-size:1rem}.converter-card{padding:1rem}}.formulas-section{margin-top:3rem;background:var(--bg-primary);border-radius:12px;padding:1.5rem}.formulas-section h2{font-size:1.75rem;margin-bottom:1.5rem;color:var(--text-primary);font-weight:600;border-bottom:2px solid var(--accent-color);padding-bottom:.75rem;display:inline-block}.formulas-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem;max-height:600px;overflow-y:auto;padding-right:.5rem}.formulas-list::-webkit-scrollbar{width:8px}.formulas-list::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:4px}.formulas-list::-webkit-scrollbar-thumb{background:var(--accent-color);border-radius:4px}.formulas-list::-webkit-scrollbar-thumb:hover{background:var(--accent-hover)}.formula-item{background:var(--bg-secondary);padding:1.25rem;border-radius:10px;border:1px solid var(--border-color);transition:all .3s ease;position:relative;overflow:hidden}.formula-item:before{content:"";position:absolute;left:0;top:0;height:100%;width:4px;background:var(--accent-color);opacity:0;transition:opacity .3s ease}.formula-item:hover{transform:translateY(-2px);border-color:var(--accent-color);box-shadow:var(--shadow-lg)}.formula-item:hover:before{opacity:1}.formula-item-title{font-size:.85rem;font-weight:600;color:var(--accent-color);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem;padding-right:1rem}.formula-item-content{font-size:1rem;color:var(--text-primary);line-height:1.5;font-family:Courier New,monospace;background:var(--bg-primary);padding:.5rem;border-radius:6px;border:1px solid var(--border-color)}.formula-item-content strong{font-weight:600;color:var(--accent-color)}.formula-item-category{position:absolute;top:.5rem;right:.5rem;font-size:.7rem;padding:.2rem .5rem;background:var(--accent-color);color:#fff;border-radius:4px;opacity:.8;text-transform:uppercase}@media (max-width: 768px){.formulas-list{grid-template-columns:1fr;max-height:500px}.formulas-section h2{font-size:1.5rem}.formula-item{padding:1rem}.formula-item-content{font-size:.9rem}}@media (max-width: 480px){.formulas-section{padding:1rem}.formula-item-title{font-size:.8rem}}.formula-category-tabs{display:flex;gap:.5rem;margin-bottom:2rem;flex-wrap:wrap;background:var(--bg-secondary);padding:.5rem;border-radius:12px;box-shadow:var(--shadow-sm)}.formula-tab-btn{flex:1;min-width:100px;padding:.75rem 1.25rem;background:transparent;border:none;border-radius:8px;font-size:.95rem;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:var(--transition)}.formula-tab-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}.formula-tab-btn.active{background:var(--accent-color);color:#fff}@media (max-width: 768px){.formula-tab-btn{min-width:80px;padding:.625rem .75rem;font-size:.875rem}}.report-issue-section{background:var(--bg-secondary);padding:3rem 0;margin:2rem 0 0;border-top:1px solid var(--border-color);border-bottom:1px solid var(--border-color)}.report-issue-section h2{font-size:1.75rem;margin-bottom:1.5rem;color:var(--text-primary);text-align:center}.report-form{max-width:600px;margin:0 auto}.form-group{margin-bottom:1.5rem;text-align:left}.form-group label{display:block;margin-bottom:.5rem;font-weight:500;color:var(--text-primary);font-size:1rem}.form-group textarea{width:100%;padding:.875rem;border:1px solid var(--border-color);border-radius:8px;background:var(--bg-primary);color:var(--text-primary);font-family:inherit;font-size:1rem;transition:var(--transition);resize:vertical}.form-group textarea:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px #2563eb1a}.submit-btn{background:var(--accent-color);color:#fff;border:none;padding:1rem 2rem;font-size:1rem;font-weight:500;border-radius:8px;cursor:pointer;transition:var(--transition);width:100%}.submit-btn:hover{background:var(--accent-hover)}.submit-btn:disabled{opacity:.7;cursor:not-allowed}.success-message{margin-top:2rem;padding:1rem;background:#10b981;color:#fff;border-radius:8px;text-align:center;font-weight:500}body.dark-mode .success-message{background:#059669}@media (min-width: 768px){.submit-btn{width:auto;display:block;margin:0 auto}}