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.orb{opacity:.35}[data-theme=dark] .orb-1{background:radial-gradient(circle,#8b5cf638,#0000 70%)}[data-theme=dark] .orb-2{background:radial-gradient(circle,#06b6d429,#0000 70%)}[data-theme=dark] .calc-stage-glow{background:radial-gradient(at 50% 30%,#8b5cf633,#0000 65%)}[data-theme=dark] .feature-card:first-child .feature-icon{background:#8b5cf626}[data-theme=dark] .feature-card:nth-child(2) .feature-icon{background:#06b6d424}[data-theme=dark] .feature-card:nth-child(3) .feature-icon{background:#f9731624}[data-theme=dark] .feature-card:nth-child(4) .feature-icon{background:#ec489924}[data-theme=dark] .feature-card:nth-child(5) .feature-icon{background:#6366f124}[data-theme=dark] .feature-card:nth-child(6) .feature-icon{background:#22c55e24}[data-theme=dark] .result-status.is-exact{color:#4ade80}[data-theme=dark] .result-status.is-approx{color:#fb923c}[data-theme=dark] .result-status.is-info{color:#22d3ee}[data-theme=dark] 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var(--ease-out);background-attachment:fixed;line-height:1.6;position:relative;overflow-x:hidden}body:before{content:"";background:var(--gradient-mesh);z-index:0;pointer-events:none;position:fixed;inset:0}::selection{color:var(--text-primary);background:#8b5cf640}.bg-orbs{z-index:0;pointer-events:none;position:fixed;inset:0;overflow:hidden}.orb{filter:blur(80px);opacity:.5;border-radius:50%;animation:20s ease-in-out infinite orbFloat;position:absolute}.orb-1{background:radial-gradient(circle,#8b5cf626,#0000 70%);width:500px;height:500px;animation-duration:25s;top:-10%;left:-5%}.orb-2{background:radial-gradient(circle,#06b6d41f,#0000 70%);width:450px;height:450px;animation-duration:30s;animation-delay:-5s;top:25%;right:-8%}.orb-3{background:radial-gradient(circle,#f9731614,#0000 70%);width:380px;height:380px;animation-duration:22s;animation-delay:-10s;bottom:5%;left:15%}.orb-4{background:radial-gradient(circle,#ec489914,#0000 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var(--space-md);border-radius:var(--radius-sm);transition:all var(--duration-fast) var(--ease-out);align-items:center;font-size:.9rem;font-weight:500;text-decoration:none;display:inline-flex;position:relative}.nav-link:hover{color:var(--text-primary);background:var(--bg-hover-subtle)}.nav-dropdown{list-style:none;position:relative}.dropdown-trigger{cursor:pointer;background:0 0;border:none;gap:4px;font-family:inherit}.dropdown-chevron{transition:transform var(--duration-fast) var(--ease-out);flex-shrink:0}.nav-dropdown.open .dropdown-chevron{transform:rotate(180deg)}.dropdown-menu{background:var(--bg-glass-strong);-webkit-backdrop-filter:blur(20px)saturate(1.3);border:1px solid var(--border-default);border-radius:var(--radius-md);min-width:240px;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transition:all var(--duration-normal) var(--ease-out);z-index:100;padding:6px;list-style:none;position:absolute;top:calc(100% + 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var(--ease-out);-webkit-backdrop-filter:blur(12px);justify-content:center;align-items:center;display:flex}.theme-toggle:hover{color:var(--primary-500);border-color:var(--border-accent);background:var(--bg-surface);box-shadow:var(--shadow-sm)}.theme-toggle:focus-visible{outline:2px solid var(--primary-400);outline-offset:2px}.theme-toggle .icon-sun{display:none}.theme-toggle .icon-moon,[data-theme=dark] .theme-toggle .icon-sun{display:block}[data-theme=dark] .theme-toggle .icon-moon{display:none}.nav-link.active{color:var(--primary-500);font-weight:600}.nav-link.active:after{content:"";background:var(--gradient-primary);border-radius:2px;width:22px;height:2.5px;position:absolute;bottom:0;left:50%;transform:translate(-50%)}.nav-toggle{cursor:pointer;padding:var(--space-sm);background:0 0;border:none;flex-direction:column;gap:5px;display:none}.nav-toggle span{background:var(--text-primary);width:22px;height:2px;transition:all var(--duration-normal) 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var(--border-default);border-radius:var(--radius-full);color:var(--primary-500);margin-bottom:var(--space-lg);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:var(--shadow-sm);letter-spacing:.02em;align-items:center;gap:8px;padding:7px 16px;font-size:.78rem;font-weight:600;display:inline-flex}.hero-badge-icon{color:var(--warm-500);animation:2.5s ease-in-out infinite starPulse}@keyframes 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var(--ease-out);align-items:center;gap:6px;font-size:.85rem;font-weight:600;text-decoration:none;display:inline-flex}.hero-link:hover{gap:10px}.hero-link svg{animation:2s ease-in-out infinite bounceDown}@keyframes bounceDown{0%,to{transform:translateY(0)}50%{transform:translateY(4px)}}.calc-stage{width:100%;animation:fadeInUp .7s var(--ease-out) .12s both;position:relative}.calc-stage-glow{pointer-events:none;z-index:0;background:radial-gradient(at 50% 30%,#8b5cf61f,#0000 65%);animation:4s ease-in-out infinite glowPulse;position:absolute;inset:-20px -10px}@keyframes glowPulse{0%,to{opacity:.6;transform:scale(1)}50%{opacity:1;transform:scale(1.02)}}.calc-stage .calc-suite{z-index:1;position:relative}.btn{align-items:center;gap:var(--space-sm);border-radius:var(--radius-full);font-family:var(--font-sans);cursor:pointer;transition:all var(--duration-normal) var(--ease-out);letter-spacing:.01em;border:none;padding:14px 30px;font-size:.95rem;font-weight:600;text-decoration:none;display:inline-flex;position:relative;overflow:hidden}.btn-primary{background:var(--gradient-primary);color:var(--text-on-primary);box-shadow:var(--shadow-glow)}.btn-primary:hover{box-shadow:var(--shadow-glow-lg);transform:translateY(-2px)}.btn-primary:active{transform:translateY(0)scale(.98)}.btn-ghost{background:var(--bg-glass-strong);color:var(--text-primary);border:1px solid var(--border-default);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:var(--shadow-sm)}.btn-ghost:hover{background:var(--bg-surface-elevated);border-color:var(--border-accent);box-shadow:var(--shadow-md);transform:translateY(-2px)}.section-header{text-align:center;margin-bottom:var(--space-3xl)}.section-badge{align-items:center;gap:var(--space-sm);background:var(--bg-glass-strong);border:1px solid 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var(--border-light);scrollbar-width:none;gap:4px;display:flex;overflow-x:auto}.calc-suite-nav::-webkit-scrollbar{display:none}.calc-tab{border-radius:var(--radius-md);color:var(--text-secondary);font-family:var(--font-sans);cursor:pointer;transition:all var(--duration-fast) var(--ease-out);white-space:nowrap;background:0 0;border:1px solid #0000;flex-shrink:0;align-items:center;gap:8px;padding:10px 16px;font-size:.84rem;font-weight:500;display:flex}.calc-tab:hover{color:var(--text-primary);background:var(--bg-hover-subtle)}.calc-tab.active{background:var(--gradient-primary);color:var(--text-on-primary);box-shadow:var(--shadow-glow);font-weight:600}.tab-icon{font-size:1rem;font-weight:700}.calc-panels{position:relative}.calc-panel{animation:panelIn .4s var(--ease-out) both;display:none}.calc-panel.active{display:block}@keyframes 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var(--space-xl);flex-direction:column;gap:0;display:flex}.calc-step{padding-bottom:var(--space-lg)}.calc-step--action{padding-bottom:var(--space-md)}.calc-step--results{padding-bottom:var(--space-lg)}.calc-step--history{padding-bottom:0;padding-top:var(--space-md);border-top:1px solid var(--border-light);display:none}.calc-step--history.show{display:block}.btn-calc-primary{border-radius:var(--radius-md);background:var(--gradient-primary);width:100%;color:var(--text-on-primary);font-family:var(--font-sans);cursor:pointer;transition:all var(--duration-normal) var(--ease-out);box-shadow:var(--shadow-glow);letter-spacing:.01em;border:none;justify-content:center;align-items:center;gap:10px;padding:14px 28px;font-size:.95rem;font-weight:600;display:flex;position:relative;overflow:hidden}.btn-calc-primary:before{content:"";transition:transform .6s var(--ease-out);background:linear-gradient(105deg,#0000 40%,#ffffff40,#0000 60%);position:absolute;inset:0;transform:translate(-100%)}.btn-calc-primary:hover:before{transform:translate(100%)}.btn-calc-primary:hover{box-shadow:var(--shadow-glow-lg);transform:translateY(-1px)}.btn-calc-primary:active{transform:translateY(0)scale(.99)}.btn-calc-primary.is-calculating{pointer-events:none;opacity:.92}.btn-calc-primary.is-calculating svg{animation:.8s linear infinite spinCalc}@keyframes spinCalc{to{transform:rotate(360deg)}}.result-panel{border-radius:var(--radius-lg);border:1.5px dashed var(--border-default);background:var(--neutral-25);transition:all var(--duration-normal) var(--ease-out);overflow:hidden}.result-empty{text-align:center;padding:var(--space-xl) var(--space-lg);flex-direction:column;justify-content:center;align-items:center;min-height:140px;display:flex}.result-empty-icon{border-radius:var(--radius-md);background:var(--neutral-100);width:48px;height:48px;color:var(--text-muted);margin-bottom:var(--space-md);justify-content:center;align-items:center;font-size:1.25rem;font-weight:700;display:flex}.result-empty-title{color:var(--text-secondary);margin-bottom:4px;font-size:.92rem;font-weight:600}.result-empty-hint{color:var(--text-muted);font-size:.8rem}.result-panel.has-result{border-style:solid;border-color:var(--primary-300);background:var(--bg-result-panel);box-shadow:0 12px 40px #7c3aed24,inset 0 1px 0 var(--surface-inset-highlight);border-radius:var(--radius-lg);transition:all var(--duration-normal) var(--ease-out);border-width:2px;position:relative;overflow:visible;transform:translateY(-2px)}.result-panel.error{background:var(--bg-error-panel);border-style:solid;border-color:#f43f5e66}.result-filled{padding:var(--space-xl) var(--space-xl) var(--space-lg);animation:resultSlideUp .4s var(--ease-spring) both}@keyframes resultSlideUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.result-panel-header{justify-content:space-between;align-items:center;gap:var(--space-md);margin-bottom:var(--space-md);padding-bottom:var(--space-sm);border-bottom:1px solid var(--border-result-header);display:flex}.result-panel-label{text-transform:uppercase;letter-spacing:.1em;color:var(--primary-500);align-items:center;gap:6px;font-size:.72rem;font-weight:700;display:flex}.result-status{border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.05em;white-space:nowrap;align-items:center;gap:5px;padding:4px 12px;font-size:.68rem;font-weight:700;display:inline-flex}.result-status:before{content:"";border-radius:50%;flex-shrink:0;width:6px;height:6px}.result-status.is-exact{color:var(--green-500);background:#22c55e1f;border:1px solid #22c55e40}.result-status.is-exact:before{background:var(--green-500)}.result-status.is-approx{color:var(--warm-500);background:#f973161f;border:1px solid #f9731640}.result-status.is-approx:before{background:var(--warm-500)}.result-status.is-info{color:var(--accent-500);background:#06b6d41f;border:1px solid #06b6d440}.result-status.is-info:before{background:var(--accent-500)}.result-status.is-decrease{color:var(--rose-500);background:#f43f5e1f;border:1px solid #f43f5e40}.result-status.is-decrease:before{background:var(--rose-500)}.result-expression{font-family:var(--font-mono);color:var(--text-muted);margin-bottom:var(--space-sm);background:var(--neutral-50);border-radius:var(--radius-sm);border:1px solid var(--border-light);padding:4px 12px;font-size:.92rem;line-height:1.5;display:inline-block}.result-answer{font-family:var(--font-mono);background:var(--gradient-hero);-webkit-text-fill-color:transparent;word-break:break-all;margin-bottom:var(--space-md);letter-spacing:-.02em;text-shadow:0 4px 12px #7c3aed26;-webkit-background-clip:text;background-clip:text;font-size:clamp(2.5rem,6vw,3.5rem);font-weight:800;line-height:1.15}.result-breakdown{gap:var(--space-sm);margin-bottom:var(--space-md);grid-template-columns:repeat(auto-fit,minmax(130px,1fr));display:grid}.result-stat{background:var(--bg-surface);border:1px solid var(--border-medium);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);transition:all var(--duration-fast) var(--ease-out);padding:12px 16px}.result-stat:hover{border-color:var(--primary-300);box-shadow:var(--shadow-md);transform:translateY(-2px)}.result-stat-label{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:4px;font-size:.65rem;font-weight:600;display:block}.result-stat-value{font-family:var(--font-mono);color:var(--text-stat-value);word-break:break-word;font-size:.85rem;font-weight:600;line-height:1.3;display:block}.result-summary{background:var(--bg-summary);border:1px solid var(--border-summary);border-radius:var(--radius-sm);color:var(--text-secondary);align-items:flex-start;gap:10px;padding:12px 14px;font-size:.82rem;line-height:1.5;display:flex}.result-summary-icon{background:var(--primary-100);width:24px;height:24px;color:var(--primary-500);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;margin-top:1px;display:flex}.result-steps{margin-top:var(--space-md);padding-top:var(--space-md);border-top:1px solid #8b5cf61f}.result-steps-header{text-transform:uppercase;letter-spacing:.08em;color:var(--primary-500);cursor:pointer;-webkit-user-select:none;user-select:none;justify-content:space-between;align-items:center;gap:8px;margin-bottom:0;padding:8px 0;font-size:.72rem;font-weight:700;list-style:none;display:flex}.result-steps-header::-webkit-details-marker{display:none}.result-steps[open] .result-steps-header{margin-bottom:var(--space-md)}.steps-chevron{transition:transform var(--duration-normal) var(--ease-spring)}.result-steps[open] .steps-chevron{transform:rotate(180deg)}.result-steps-header svg{flex-shrink:0}.result-steps-list{flex-direction:column;gap:0;list-style:none;display:flex;position:relative}.result-steps-list:before{content:"";background:linear-gradient(180deg,var(--primary-200),var(--accent-200));border-radius:2px;width:2px;position:absolute;top:20px;bottom:20px;left:15px}.result-step{gap:var(--space-md);opacity:0;animation:stepReveal .45s var(--ease-out) 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answerPop{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}.result-error{align-items:center;gap:var(--space-md);padding:var(--space-lg);animation:.4s ease-out shake;display:flex}.result-error-icon{border-radius:var(--radius-sm);width:40px;height:40px;color:var(--rose-500);background:#f43f5e1f;flex-shrink:0;justify-content:center;align-items:center;font-size:1.1rem;font-weight:700;display:flex}.result-error-text{color:var(--rose-500);font-size:.9rem;font-weight:500;line-height:1.4}.input-group{flex-direction:column;flex:1;gap:6px;display:flex}.input-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;font-size:.72rem;font-weight:600}.input-wrapper{align-items:center;display:flex;position:relative}.input-prefix{color:var(--primary-400);pointer-events:none;z-index:1;font-size:.95rem;font-weight:700;position:absolute;left:14px}.calc-input{background:var(--bg-input);border:1.5px solid var(--border-default);border-radius:var(--radius-md);width:100%;color:var(--text-primary);font-family:var(--font-mono);transition:all var(--duration-normal) var(--ease-out);-moz-appearance:textfield;outline:none;padding:12px 14px 12px 42px;font-size:1rem;font-weight:500}.calc-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.calc-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.calc-input:focus{border-color:var(--primary-400);background:var(--bg-input-focus);box-shadow:var(--shadow-input-focus)}.calc-input::placeholder{color:var(--text-muted);font-weight:400}.input-row{gap:var(--space-md);display:flex}.fraction-workspace{justify-content:center;align-items:center;gap:var(--space-lg);padding:var(--space-md) 0;display:flex}.frac-block{align-items:center;gap:var(--space-sm);flex-direction:column;display:flex}.frac-block-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;font-size:.72rem;font-weight:600}.frac-stacked{flex-direction:column;align-items:center;gap:2px;min-width:100px;display:flex}.frac-stacked .input-label{align-self:center;margin-bottom:4px}.frac-input{background:var(--bg-input);border:1.5px solid var(--border-default);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);font-family:var(--font-mono);text-align:center;transition:all var(--duration-normal) var(--ease-out);-moz-appearance:textfield;outline:none;padding:10px 12px;font-size:1rem;font-weight:500}.frac-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.frac-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.frac-input:focus{border-color:var(--primary-400);background:var(--bg-input-focus);box-shadow:var(--shadow-input-focus)}.frac-input::placeholder{color:var(--text-muted);font-weight:400}.frac-bar{background:linear-gradient(90deg,transparent,var(--primary-300),transparent);border-radius:2px;width:100%;height:3px;margin:2px 0}.operation-selector{background:var(--neutral-100);border:1px solid var(--border-default);border-radius:var(--radius-md);grid-template-columns:1fr 1fr;align-self:center;gap:4px;padding:4px;display:grid}.op-btn{border-radius:var(--radius-sm);width:40px;height:40px;color:var(--text-secondary);cursor:pointer;transition:all var(--duration-fast) var(--ease-out);font-size:1.1rem;font-weight:600;font-family:var(--font-sans);background:0 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14px;font-size:.82rem;font-weight:500}.quick-btn:hover{color:var(--primary-500);border-color:var(--border-accent);background:var(--primary-50);box-shadow:var(--shadow-xs)}.history-header{margin-bottom:var(--space-md);justify-content:space-between;align-items:center;display:flex}.history-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;font-size:.75rem;font-weight:700}.history-count{color:var(--primary-500);background:var(--primary-50);border-radius:var(--radius-full);padding:2px 10px;font-size:.72rem;font-weight:600}.history-list{flex-direction:column;gap:6px;display:flex}.history-item{padding:10px var(--space-md);background:var(--neutral-50);border:1px solid var(--border-light);border-radius:var(--radius-sm);font-family:var(--font-mono);color:var(--text-secondary);animation:fadeInUp .3s var(--ease-out) both;transition:all var(--duration-fast) var(--ease-out);justify-content:space-between;align-items:center;font-size:.82rem;display:flex}.history-item:hover{background:var(--primary-50);border-color:var(--border-accent)}.history-expression{flex:1}.history-result{color:var(--primary-500);margin-left:var(--space-md);font-weight:600}.seo-article{z-index:1;position:relative}.article-section{padding:var(--space-4xl) var(--space-lg);position:relative}.article-section--alt{background:var(--neutral-25);border-top:1px solid var(--border-light);border-bottom:1px solid var(--border-light)}[data-theme=dark] .article-section--alt{background:#16162a66}.article-container{max-width:920px;margin:0 auto}.section-eyebrow{background:var(--bg-glass-strong);border:1px solid var(--border-default);border-radius:var(--radius-full);color:var(--primary-500);margin-bottom:var(--space-lg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:var(--shadow-xs);letter-spacing:.02em;align-items:center;gap:8px;padding:6px 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0;box-shadow:var(--shadow-sm);overflow-x:auto}.math-formula{font-family:var(--font-mono);color:var(--primary-500);white-space:nowrap;font-size:1.05rem;font-weight:600;line-height:1.6}[data-theme=dark] .math-formula{color:var(--primary-300,#c4b5fd)}.examples-grid{gap:var(--space-md);margin:var(--space-xl) 0;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));display:grid}.example-card{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:var(--space-lg);text-align:center;transition:all var(--duration-normal) 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thead{top:0}.table-scroll-hint{background:var(--neutral-50);border-bottom:1px solid var(--border-light);color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;align-items:center;gap:8px;padding:8px 16px;font-size:.72rem;font-weight:600;display:flex}[data-theme=dark] .table-scroll-hint{background:var(--neutral-100)}.table-scroll-wrapper>:last-child{max-height:inherit;scrollbar-width:thin;scrollbar-color:var(--color-scrollbar-thumb) var(--color-scrollbar-track);overflow:auto}.table-scroll-wrapper:after{content:"";background:linear-gradient(to left,var(--bg-surface),transparent);pointer-events:none;z-index:2;opacity:.8;width:40px;height:100%;position:absolute;top:0;right:0}.data-table{border-collapse:collapse;white-space:nowrap;width:100%;font-size:.9rem}.data-table thead{z-index:3;position:sticky;top:0}.data-table th{background:var(--neutral-100);border-bottom:2px solid var(--border-default);text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);text-align:left;padding:12px 18px;font-size:.72rem;font-weight:700}[data-theme=dark] .data-table th{background:var(--neutral-150)}.data-table td{border-bottom:1px solid var(--border-light);font-family:var(--font-mono);color:var(--text-primary);transition:background-color var(--duration-fast) var(--ease-out);padding:10px 18px;font-size:.88rem;font-weight:500}.data-table tbody tr:hover td{background:var(--bg-hover-subtle)}.data-table tbody tr:last-child td{border-bottom:none}.data-table--compact td,.data-table--compact th{padding:8px 14px}.data-table--comparison td:first-child,.data-table--comparison th:first-child{color:var(--text-primary);font-weight:600;font-family:var(--font-sans)}.data-table--reference{font-size:.82rem}.data-table--reference td,.data-table--reference th{text-align:center;padding:8px 12px}.data-table--reference th{font-size:.68rem}.td-bold{color:var(--primary-500)!important;font-weight:700!important}.data-table--vertical{font-size:.9rem}.data-table--vertical td,.data-table--vertical th{text-align:left;padding:10px 20px}.data-table--vertical th{font-size:.74rem}.data-table--vertical td:first-child{color:var(--text-primary);min-width:70px;font-weight:700}.data-table--vertical td:nth-child(2){font-family:var(--font-mono);color:var(--primary-600);min-width:120px;font-weight:600}[data-theme=dark] .data-table--vertical td:nth-child(2){color:var(--primary-300)}.data-table--vertical td:nth-child(3){font-family:var(--font-sans);color:var(--text-muted);font-size:.8rem;font-weight:500}.tr-perfect td{background:#7c3aed0d!important}.tr-perfect td:first-child{color:var(--primary-600)!important}[data-theme=dark] .tr-perfect td{background:#8b5cf61a!important}.badge-perfect{background:var(--primary-50);color:var(--primary-600);border:1px solid var(--primary-100);border-radius:var(--radius-full);letter-spacing:.02em;white-space:nowrap;align-items:center;gap:4px;padding:3px 10px;font-size:.72rem;font-weight:700;display:inline-flex}[data-theme=dark] .badge-perfect{color:var(--primary-200);background:#8b5cf626;border-color:#8b5cf64d}.table-highlight td{font-weight:700;background:#22c55e14!important}[data-theme=dark] .table-highlight td{background:#22c55e1f!important}.footer-brand-wrap{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;width:100%;display:flex}.footer-social{align-items:center;gap:12px;display:flex}.social-icon-btn{border-radius:var(--radius-full);background:var(--bg-hover-subtle);width:38px;height:38px;color:var(--primary-500);border:1px solid var(--border-default);justify-content:center;align-items:center;text-decoration:none;transition:all .2s;display:inline-flex}.social-icon-btn:hover{color:#fff;background:#1877f2;border-color:#1877f2;transform:translateY(-2px);box-shadow:0 4px 14px #1877f266}.cell-check{text-align:center;font-size:1.15rem}.table-note{color:var(--text-muted);margin-top:var(--space-sm);font-size:.82rem;font-style:italic}.steps-visual{gap:var(--space-md);margin:var(--space-xl) 0;flex-direction:column;display:flex;position:relative}.steps-visual:before{content:"";background:linear-gradient(180deg,var(--primary-200),var(--accent-200));z-index:0;border-radius:3px;width:3px;position:absolute;top:40px;bottom:40px;left:27px}.step-card{gap:var(--space-lg);z-index:1;align-items:flex-start;display:flex;position:relative}.step-number{background:var(--gradient-primary);color:#fff;width:56px;height:56px;box-shadow:var(--shadow-glow);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:1.4rem;font-weight:800;display:flex}.step-content{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:var(--space-lg) var(--space-xl);box-shadow:var(--shadow-sm);transition:all var(--duration-normal) var(--ease-out);flex:1}.step-content:hover{border-color:var(--border-accent);box-shadow:var(--shadow-card-hover);transform:translate(4px)}.step-content h4{color:var(--text-heading);margin-bottom:6px;font-size:1.08rem;font-weight:700}.step-content p{color:var(--text-secondary);margin-bottom:0;font-size:.9rem;line-height:1.6}.law-cards{gap:var(--space-xl);margin:var(--space-2xl) 0;counter-reset:law-counter;flex-direction:column;display:flex}.law-card{background:var(--bg-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-medium);border-radius:var(--radius-xl);padding:var(--space-2xl) var(--space-xl) var(--space-2xl) var(--space-2xl);transition:all var(--duration-slow) var(--ease-spring);flex-direction:column;display:flex;position:relative;overflow:hidden;box-shadow:0 4px 24px #0000000a,inset 0 1px #fff9}.law-card:before{content:"";background:var(--gradient-primary);opacity:.8;height:4px;transition:height var(--duration-normal) var(--ease-out);position:absolute;top:0;left:0;right:0}.law-card:hover{border-color:var(--primary-300);transform:translateY(-6px);box-shadow:0 20px 40px #7c3aed1f,inset 0 1px #fffc}.law-card:hover:before{height:6px}.law-label{text-transform:uppercase;letter-spacing:.1em;color:var(--primary-600);background:var(--primary-50);border:1px solid var(--primary-100);border-radius:var(--radius-full);margin-bottom:var(--space-lg);align-self:flex-start;align-items:center;gap:8px;padding:6px 16px;font-size:.8rem;font-weight:800;display:inline-flex}[data-theme=dark] .law-label{color:var(--primary-200);background:#8b5cf626;border-color:#8b5cf64d}.law-header{align-items:center;gap:var(--space-md);margin-bottom:var(--space-lg);display:flex}.law-number{background:var(--gradient-hero);color:#fff;width:44px;height:44px;box-shadow:var(--shadow-glow);letter-spacing:-.02em;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:1.15rem;font-weight:800;display:flex}.law-subtitle{color:var(--text-muted);margin-top:2px;font-size:.82rem;font-weight:500;line-height:1.3}.law-card .math-block{margin:0 0 var(--space-lg) 0;border:none;border-left:4px solid var(--primary-400);background:var(--neutral-50);padding:var(--space-md) var(--space-lg);border-radius:0 var(--radius-md) var(--radius-md) 0;box-shadow:inset 0 2px 4px #00000005}[data-theme=dark] .law-card .math-block{background:var(--neutral-100)}.law-card .math-formula{color:var(--primary-600);font-size:1.15rem}[data-theme=dark] .law-card .math-formula{color:var(--primary-300)}.law-example{color:var(--text-secondary);background:var(--neutral-25);padding:var(--space-md);border-radius:var(--radius-md);border:1px dashed var(--border-medium);flex-grow:1;margin:0;font-size:.92rem;line-height:1.7}[data-theme=dark] .law-example{background:var(--neutral-50)}.law-explanation{color:var(--text-secondary);margin:var(--space-md) 0 0 0;font-size:.94rem;line-height:1.75}.law-example strong{color:var(--text-primary);font-weight:700}.warning-box{gap:var(--space-lg);border:1px solid #f9731633;border-left:4px solid var(--warm-400);border-radius:var(--radius-lg);padding:var(--space-xl);margin:var(--space-2xl) 0;background:#f973160f;align-items:flex-start;display:flex}[data-theme=dark] .warning-box{background:#f9731614;border-color:#f9731640}.warning-icon{flex-shrink:0;margin-top:2px;font-size:1.8rem}.warning-content{flex:1}.warning-content strong{color:var(--text-primary);font-size:1.05rem}.warning-content p{color:var(--text-secondary);margin-bottom:0;font-size:.9rem}.method-example{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:var(--space-lg) var(--space-xl);margin:var(--space-md) 0 var(--space-lg);box-shadow:var(--shadow-sm)}.method-title{font-family:var(--font-mono);color:var(--primary-500);margin-bottom:var(--space-md);padding-bottom:var(--space-sm);border-bottom:1px solid var(--border-light);font-size:.88rem;font-weight:700}.method-steps-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.method-steps-list li{color:var(--text-secondary);padding-left:24px;font-size:.9rem;line-height:1.6;position:relative}.method-steps-list li:before{content:"→";color:var(--primary-400);font-weight:700;position:absolute;left:0}.applications-grid{gap:var(--space-lg);margin:var(--space-xl) 0;flex-direction:column;display:flex}.app-card{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-xl);padding:var(--space-xl) var(--space-2xl);box-shadow:var(--shadow-sm);transition:all var(--duration-normal) var(--ease-out);align-items:flex-start;gap:var(--space-xl);display:flex;position:relative;overflow:hidden}@media(max-width:600px){.app-card{flex-direction:column}}.app-card:before{content:"";background:var(--gradient-primary);opacity:0;height:3px;transition:opacity var(--duration-normal) var(--ease-out);position:absolute;top:0;left:0;right:0}.app-card:hover{border-color:var(--border-accent);box-shadow:var(--shadow-card-hover);transform:translateY(-4px)}.app-card:hover:before{opacity:1}.app-icon{border-radius:var(--radius-lg);background:var(--primary-50);border:1px solid var(--primary-100);width:56px;height:56px;color:var(--primary-500);flex-shrink:0;justify-content:center;align-items:center;font-size:2rem;display:flex}[data-theme=dark] .app-icon{color:var(--primary-300);background:#8b5cf61f;border-color:#8b5cf640}.app-card-content{flex:1;min-width:0}.app-card h4{color:var(--text-heading);margin-bottom:var(--space-md);font-size:1.08rem;font-weight:700}.app-card ul{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.app-card li{color:var(--text-secondary);padding-left:18px;font-size:.88rem;line-height:1.55;position:relative}.app-card li:before{content:"•";color:var(--primary-400);font-weight:700;position:absolute;left:0}.app-card li strong{color:var(--text-primary);font-weight:600}.faq-list{gap:var(--space-md);counter-reset:faq-counter;flex-direction:column;display:flex}.faq-item{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);transition:all var(--duration-normal) var(--ease-out);box-shadow:var(--shadow-xs);counter-increment:faq-counter;overflow:hidden}.faq-item:hover{border-color:var(--border-accent);box-shadow:var(--shadow-md)}.faq-item[open]{border-color:var(--border-accent-strong);box-shadow:var(--shadow-card-hover);border-left:3px solid var(--primary-500)}.faq-question{align-items:center;gap:var(--space-md);padding:var(--space-lg) var(--space-xl);color:var(--text-primary);cursor:pointer;transition:background-color var(--duration-fast) var(--ease-out);-webkit-user-select:none;user-select:none;font-size:1rem;font-weight:600;list-style:none;display:flex}.faq-question::-webkit-details-marker{display:none}.faq-question:before{content:counter(faq-counter);background:var(--primary-50);border:1.5px solid var(--border-accent);width:28px;height:28px;color:var(--primary-500);transition:all var(--duration-normal) var(--ease-out);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.8rem;font-weight:700;display:flex}[data-theme=dark] .faq-question:before{background:#8b5cf626}.faq-item[open] .faq-question:before{background:var(--gradient-primary);color:#fff;border-color:#0000}.faq-question:after{content:"+";border-radius:var(--radius-sm);background:var(--neutral-50);border:1px solid var(--border-light);width:28px;height:28px;color:var(--primary-500);transition:all var(--duration-normal) var(--ease-out);flex-shrink:0;justify-content:center;align-items:center;margin-left:auto;font-size:1.1rem;font-weight:700;display:flex}[data-theme=dark] .faq-question:after{background:var(--neutral-800);border-color:var(--neutral-700)}.faq-item[open] .faq-question:after{content:"−";background:var(--gradient-primary);color:#fff;border-color:#0000;transform:rotate(180deg)}.faq-question:hover{background:var(--bg-hover-subtle)}.faq-answer{padding:0 var(--space-xl) var(--space-lg);padding-left:calc(var(--space-xl) + 2px);animation:faqOpen .35s var(--ease-out)}@keyframes faqOpen{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.faq-answer p{color:var(--text-secondary);margin-bottom:0;font-size:.92rem;line-height:1.7}.faq-answer a{color:var(--primary-500);transition:color var(--duration-fast) var(--ease-out);font-weight:600;text-decoration:none}.faq-answer a:hover{color:var(--primary-600);text-decoration:underline}.tips-grid{gap:var(--space-md);margin:var(--space-xl) 0;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));display:grid}.tip-card{gap:var(--space-md);background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-sm);transition:all var(--duration-normal) var(--ease-out);align-items:flex-start;display:flex}.tip-card:hover{border-color:var(--border-accent);box-shadow:var(--shadow-card-hover);transform:translateY(-3px)}.tip-number{background:var(--gradient-primary);color:#fff;width:36px;height:36px;box-shadow:var(--shadow-glow);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.9rem;font-weight:800;display:flex}.tip-card p{color:var(--text-secondary);margin-bottom:0;font-size:.9rem;line-height:1.6}.tip-card p strong{color:var(--text-primary)}.cta-block{text-align:center;margin-top:var(--space-2xl);padding:var(--space-2xl);background:var(--bg-surface);border:1px solid var(--border-accent);border-radius:var(--radius-2xl);box-shadow:var(--shadow-card)}.cta-button{background:var(--gradient-primary);color:#fff;font-family:var(--font-sans);border-radius:var(--radius-full);cursor:pointer;transition:all var(--duration-normal) var(--ease-out);box-shadow:var(--shadow-glow-lg);letter-spacing:.01em;border:none;align-items:center;gap:10px;padding:16px 36px;font-size:1.05rem;font-weight:700;text-decoration:none;display:inline-flex}.cta-button:hover{transform:translateY(-3px);box-shadow:0 12px 48px #7c3aed66}.cta-subtitle{color:var(--text-muted);margin-top:var(--space-md);margin-bottom:0;font-size:.88rem}.footer{z-index:1;border-top:1px solid var(--border-default);padding:var(--space-3xl) var(--space-lg) var(--space-xl);background:var(--bg-glass);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);margin-top:0;position:relative}.footer-container{max-width:1200px;margin:0 auto}.footer-top{text-align:center;margin-bottom:var(--space-2xl)}.footer-brand{align-items:center;gap:var(--space-sm);margin-bottom:var(--space-sm);font-size:1.15rem;font-weight:700;display:inline-flex}.footer-tagline{color:var(--text-secondary);font-size:.92rem}.footer-grid{gap:var(--space-2xl);padding-bottom:var(--space-2xl);border-bottom:1px solid var(--border-light);grid-template-columns:repeat(4,1fr);display:grid}.footer-col-title{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin-bottom:var(--space-md);font-size:.8rem;font-weight:700}.footer-col-links{gap:var(--space-sm);flex-direction:column;display:flex}.footer-col-links a{color:var(--text-secondary);transition:color var(--duration-fast) var(--ease-out);font-size:.9rem;font-weight:500;text-decoration:none}.footer-col-links a:hover{color:var(--primary-500)}.footer-bottom{padding-top:var(--space-lg);justify-content:space-between;align-items:center;display:flex}.footer-copy,.footer-made{color:var(--text-muted);font-size:.82rem}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.reveal{opacity:0;transition:all .7s var(--ease-out);transform:translateY(30px)}.reveal.visible{opacity:1;transform:translateY(0)}@media(max-width:1200px){.logo-text{max-width:180px}.nav-container{gap:10px}.nav-link{padding-inline:10px;font-size:.85rem}.applications-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:1024px){.nav-links{background:var(--bg-mobile-nav);-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);justify-content:center;align-items:center;gap:var(--space-md);z-index:999;flex-direction:column;display:none;position:fixed;inset:0}.nav-links.open{display:flex}.nav-link{padding:var(--space-md) var(--space-xl);font-size:1.2rem}.nav-dropdown{text-align:center;width:100%}.dropdown-trigger{padding:var(--space-md) var(--space-xl);justify-content:center;width:100%;font-size:1.2rem}.dropdown-menu{min-width:unset;width:100%;max-width:320px;margin:var(--space-sm) auto 0;background:var(--bg-surface-elevated);border:1px solid var(--border-default);box-shadow:none;opacity:0;visibility:hidden;max-height:0;transition:all var(--duration-normal) var(--ease-out);position:static;overflow:hidden;transform:none}.nav-dropdown.open .dropdown-menu{opacity:1;visibility:visible;max-height:300px;transform:none}.nav-actions{z-index:1001;gap:8px}.nav-toggle{display:flex}}@media(max-width:768px){.page-shell{padding:88px var(--space-md) var(--space-2xl)}.above-fold{padding:80px var(--space-md) var(--space-xl);min-height:auto}.above-fold-stack{gap:var(--space-lg)}.calc-tab{padding:10px 12px;font-size:.8rem}.tab-label{display:none}.tab-icon{font-size:1.2rem}.calc-widget-head{padding:var(--space-lg) var(--space-md) var(--space-md)}.calc-widget-flow{padding:var(--space-md) var(--space-md) var(--space-lg)}.result-filled{padding:var(--space-md)}.result-answer{font-size:1.75rem}.result-breakdown{grid-template-columns:1fr 1fr}.input-row{flex-direction:column}.fraction-workspace{gap:var(--space-md);flex-direction:column}.frac-stacked{min-width:80px}.footer-bottom{gap:var(--space-sm);text-align:center;flex-direction:column}.footer-grid{gap:var(--space-xl);grid-template-columns:repeat(2,1fr)}.article-section{padding:var(--space-2xl) var(--space-md)}.article-h2{font-size:1.6rem}.article-h3{font-size:1.15rem}.examples-grid,.applications-grid,.tips-grid{grid-template-columns:1fr}.steps-visual:before{left:22px}.step-number{width:44px;height:44px;font-size:1.1rem}.step-content{padding:var(--space-md)}.law-card{padding:var(--space-lg)}.warning-box{gap:var(--space-md);flex-direction:column}.faq-question{padding:var(--space-md) var(--space-lg);font-size:.92rem}.faq-answer{padding:0 var(--space-lg) var(--space-md)}.math-block{padding:var(--space-md)}.math-formula{font-size:.9rem}.cta-block{padding:var(--space-xl) var(--space-md)}.cta-button{padding:14px 28px;font-size:.95rem}}@media(max-width:480px){.nav-container{padding:0 var(--space-md);gap:8px}.logo-icon{width:36px;height:36px}.nav-logo .logo-text{max-width:96px}.hero-title{font-size:2rem}.result-answer{font-size:1.6rem}.result-breakdown{grid-template-columns:1fr}.step-card{text-align:center;flex-direction:column;align-items:center}.steps-visual:before{display:none}.data-table--reference td,.data-table--reference th{padding:6px 8px;font-size:.75rem}}@media(max-width:420px){.nav-logo .logo-text{display:none}.nav-actions{margin-left:auto}}::-webkit-scrollbar{width:7px;height:7px}::-webkit-scrollbar-track{background:var(--color-scrollbar-track)}::-webkit-scrollbar-thumb{background:var(--color-scrollbar-thumb);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--color-scrollbar-thumb-hover)}:focus-visible{outline:2px solid var(--primary-400);outline-offset:2px}input[type=number]{-moz-appearance:textfield}.back-to-top{bottom:var(--space-xl);right:var(--space-lg);border-radius:var(--radius-full);background:var(--bg-surface);width:48px;height:48px;color:var(--primary-500);border:1px solid var(--border-default);cursor:pointer;opacity:0;pointer-events:none;transition:all var(--duration-normal) var(--ease-spring);z-index:999;box-shadow:var(--shadow-md);-webkit-backdrop-filter:blur(12px);justify-content:center;align-items:center;display:flex;position:fixed;transform:translateY(20px)}.back-to-top.visible{opacity:1;pointer-events:auto;transform:translateY(0)}.back-to-top:hover{background:var(--bg-hover-subtle);color:var(--primary-600);box-shadow:var(--shadow-lg);border-color:var(--border-accent);transform:translateY(-3px)}.premium-check{color:var(--green-500);width:22px;height:22px;margin:0 auto;display:block}.mobile-bottom-nav{display:none}@media(max-width:768px){.mobile-bottom-nav{background:var(--bg-glass-strong);-webkit-backdrop-filter:blur(16px);border-top:1px solid var(--border-default);z-index:1000;padding-bottom:env(safe-area-inset-bottom,0px);height:calc(64px + env(safe-area-inset-bottom,0px));justify-content:space-around;align-items:center;display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -4px 12px #0000000d}.mobile-nav-item{color:var(--text-muted);height:100%;transition:color var(--duration-fast) var(--ease-out);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:4px;padding:8px 0;text-decoration:none;display:flex}.mobile-nav-item svg{transition:transform var(--duration-fast) var(--ease-out)}.mobile-nav-item span{font-size:.65rem;font-weight:600}.mobile-nav-item.active,.mobile-nav-item:active{color:var(--primary-500)}.mobile-nav-item.active svg{transform:translateY(-2px)}body{padding-bottom:calc(76px + env(safe-area-inset-bottom,0px))!important}.nav-toggle{display:none!important}.navbar{padding:12px 16px;position:sticky;top:0}.hero-section{padding-top:2rem!important;padding-bottom:2rem!important}.hero-title{font-size:clamp(2rem,8vw,2.5rem)!important}.calc-btn,.btn-calc-primary{min-height:48px}.calc-input{min-height:48px;font-size:16px!important}@media(hover:none){.calc-btn:hover,.btn-calc-primary:hover,.app-card:hover,.law-card:hover{box-shadow:none!important;transform:none!important}.calc-btn:active,.btn-calc-primary:active{transform:scale(.98)!important}}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}