:root{--primary-color:#06f;--primary-hover:#004edb;--primary-light:#08f;--primary-glow:rgba(0,102,255,.25);--accent-color:#00c8ff;--bg-color:#f8fafc;--card-bg:#fff;--card-border:rgba(0,102,255,.12);--text-color:#0f172a;--text-muted:#64748b;--text-link:#06f;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--max-width:1200px;--transition:all .25s cubic-bezier(.4, 0, .2, 1);--shadow-card:inset 0 1px 0 #fff, 0 1px 3px rgba(0,0,0,.02), 0 8px 24px -4px rgba(0,102,255,.08), 0 20px 48px -8px rgba(0,102,255,.06)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-color);font-family:var(--font-sans);flex-direction:column;min-height:100vh;line-height:1.6;display:flex;overflow-x:hidden}.lang-nav-container{max-width:var(--max-width);-webkit-backdrop-filter:blur(12px);width:100%;transition:var(--transition);background:rgba(255,255,255,.8);border-bottom:1px solid rgba(0,0,0,.05);margin:0 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var(--card-border);box-shadow:var(--shadow-card);transition:var(--transition);border-radius:16px;margin:12px 0 16px;padding:24px}button,.btn{color:#fff;cursor:pointer;transition:var(--transition);background:linear-gradient(135deg,#0048ff 0%,#06f 50%,#08f 100%);border:none;border-radius:8px;justify-content:center;align-items:center;gap:6px;padding:10px 24px;font-size:14px;font-weight:700;display:inline-flex;box-shadow:0 4px 16px rgba(0,102,255,.42),0 2px 6px rgba(0,72,255,.25)}button:hover,.btn:hover{background:linear-gradient(135deg,#003cdb 0%,#0055e8 50%,#0077f5 100%);transform:translateY(-1.5px);box-shadow:0 8px 26px rgba(0,102,255,.55),0 4px 12px rgba(0,72,255,.35)}button:active,.btn:active{transform:translateY(0)}.app-footer{max-width:var(--max-width);-webkit-backdrop-filter:blur(10px);background:rgba(255,255,255,.5);border-top:1px solid rgba(0,0,0,.05);width:100%;margin:auto auto 0}.footer-content{max-width:var(--max-width);text-align:center;flex-direction:column;align-items:center;gap:16px;margin:0 auto;padding:20px;display:flex}.footer-lang-nav{flex-wrap:wrap;justify-content:center;gap:12px 16px;width:100%;padding:4px 0 12px;display:flex}.footer-links{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px 16px;display:flex}.footer-link{color:var(--primary-color);transition:var(--transition);background:rgba(0,102,255,.05);border:1px solid rgba(0,102,255,.25);border-radius:20px;padding:6px 14px;font-size:13px;font-weight:600;text-decoration:none;display:inline-block}.footer-link:hover{color:var(--primary-hover);background:rgba(0,102,255,.12);border-color:rgba(0,102,255,.5);transform:translateY(-1px)}.footer-copyright{color:rgba(0,0,0,.35);font-size:13px}@media (max-width:1024px){.brand-section{text-align:left;flex-direction:column;align-items:flex-start;gap:24px}.brand-info{align-items:flex-start}.app-header{text-align:left}.toolbox-badge-wrapper{justify-content:flex-start}}@media (max-width:768px){.app-title{font-size:1.4rem}.header-ad{display:none}.lang-nav,.app-container{padding-left:10px;padding-right:10px}.footer-lang-nav{justify-content:flex-start}}.custom-toast-container{z-index:999999;pointer-events:none;flex-direction:column;align-items:center;gap:10px;display:flex;position:fixed;top:24px;left:50%;transform:translate(-50%)}.custom-toast{color:#fff;-webkit-backdrop-filter:blur(8px);opacity:0;pointer-events:auto;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;background:rgba(15,23,42,.9);border-radius:30px;align-items:center;gap:8px;padding:9px 18px;font-size:13px;font-weight:600;transition:opacity .25s cubic-bezier(.4,0,.2,1),transform .25s 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0;padding:32px 36px}.article-section{margin-bottom:30px}.article-section:last-child{margin-bottom:0}.article-h2{color:#0f172a;border-bottom:2px solid #f1f5f9;margin-bottom:12px;padding-bottom:8px;font-size:1.25rem;font-weight:800}.article-h3{color:#1e293b;margin:16px 0 10px;font-size:1.05rem;font-weight:700}.article-p{color:#334155;margin-bottom:12px;font-size:14.5px;line-height:1.75}.article-p:last-child{margin-bottom:0}.article-formula-box{background:#f8fafc;border:1px dashed #cbd5e1;border-radius:10px;margin:14px 0;padding:14px 20px;overflow-x:auto}.article-steps-flow{flex-direction:column;gap:12px;margin:14px 0;display:flex}.flow-step{background:#f8fafc;border:1px solid #f1f5f9;border-radius:10px;align-items:flex-start;gap:12px;padding:12px 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