:root{--primary:#1e90ff;--secondary:#4169e1;--accent:#00bfff;--success:#228b22;--warning:#ff8c00;--danger:#dc143c;--dark:#2c3e50;--light:#f0f8ff;--bg-primary:#ffffff;--bg-secondary:#f8fbff;--bg-tertiary:#f0f8ff;--surface:#ffffff;--surface-elevated:#f8f9fa;--text-primary:#2c3e50;--text-secondary:#6c757d;--text-muted:#95a5a6;--text-inverse:#ffffff;--border:rgba(30,144,255,0.1);--border-light:rgba(30,144,255,0.05);--shadow-sm:0 1px 3px rgba(0,0,0,0.1);--shadow-md:0 4px 6px rgba(0,0,0,0.1);--shadow-lg:0 10px 15px rgba(0,0,0,0.1);--shadow-xl:0 20px 25px rgba(0,0,0,0.1);--gradient-primary:linear-gradient(135deg,#1e90ff 0%,#4169e1 100%);--gradient-secondary:linear-gradient(135deg,#4169e1 0%,#6495ed 100%);--gradient-accent:linear-gradient(135deg,#00bfff 0%,#87ceeb 100%);--space-xs:0.25rem;--space-sm:0.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-2xl:3rem;--space-3xl:4rem;--font-size-xs:0.75rem;--font-size-sm:0.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:1.875rem;--font-size-4xl:2.25rem;--font-size-5xl:3rem;--transition-fast:0.15s ease-in-out;--transition-normal:0.3s ease-in-out;--transition-slow:0.5s ease-in-out;--container-max-width:1200px;--container-padding:1rem;--section-padding:2rem 0;--hero-height:60vh;--button-radius:0.5rem;--card-radius:1rem;--input-radius:0.375rem}[data-theme="dark"]{--primary:#87ceeb;--secondary:#6495ed;--accent:#87cefa;--success:#00ff7f;--warning:#ffa500;--danger:#ff6347;--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-tertiary:#3d3d3d;--surface:#2d2d2d;--surface-elevated:#3d3d3d;--text-primary:#f5f5f5;--text-secondary:#b0b0b0;--text-muted:#6c757d;--text-inverse:#1a1a1a;--border:rgba(135,206,235,0.2);--border-light:rgba(135,206,235,0.1);--shadow-sm:0 1px 3px rgba(0,0,0,0.3);--shadow-md:0 4px 6px rgba(0,0,0,0.4);--shadow-lg:0 10px 15px rgba(0,0,0,0.5);--shadow-xl:0 20px 25px rgba(0,0,0,0.6);--gradient-primary:linear-gradient(135deg,#87ceeb 0%,#6495ed 100%);--gradient-secondary:linear-gradient(135deg,#6495ed 0%,#4682b4 100%);--gradient-accent:linear-gradient(135deg,#87cefa 0%,#5f9ea0 100%)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px;line-height:1.6}body{font-family:'Times New Roman', Times, serif;color:var(--text-primary);background:var(--bg-primary);transition:background-color var(--transition-normal),color var(--transition-normal);overflow-x:hidden}.container{max-width:var(--container-max-width);margin:0 auto;padding:0 var(--container-padding);width:100%}.progress-container{position:fixed;top:0;left:0;width:100%;height:4px;background:rgba(0,0,0,0.1);z-index:9999;backdrop-filter:blur(10px)}.progress-bar{height:100%;background:var(--gradient-primary);width:0%;transition:width 0.1s ease;box-shadow:0 0 10px rgba(30,144,255,0.5)}.theme-toggle{position:fixed;bottom:20px;right:20px;width:60px;height:60px;border-radius:50%;background:var(--gradient-primary);color:var(--text-inverse);border:none;box-shadow:var(--shadow-xl);cursor:pointer;transition:all var(--transition-normal);display:flex;align-items:center;justify-content:center;font-size:1.5rem;z-index:1000}.theme-toggle:hover{transform:scale(1.1);box-shadow:0 25px 50px rgba(0,0,0,0.25)}.theme-toggle:active{transform:scale(0.95)}.theme-icon{transition:all var(--transition-normal)}.theme-toggle .sun-icon{display:none}.theme-toggle .moon-icon{display:block}[data-theme="dark"] .theme-toggle .sun-icon{display:block}[data-theme="dark"] .theme-toggle .moon-icon{display:none}.hero-section{background:var(--gradient-primary);color:var(--text-inverse);padding:var(--space-3xl) 0;position:relative;overflow:hidden;min-height:var(--hero-height);display:flex;align-items:center}.hero-section::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20"><defs><radialGradient id="a" cx="50" cy="50" r="50"><stop offset="0" stop-color="rgba(255,255,255,.1)"/><stop offset="100" stop-color="rgba(255,255,255,0)"/></radialGradient></defs><rect width="100" height="20" fill="url(%23a)"/></svg>') repeat;opacity:0.1}.hero-content{position:relative;z-index:2;text-align:center;width:100%}.hero-title{font-size:clamp(2.5rem,5vw,4rem);font-weight:700;margin-bottom:var(--space-lg);text-shadow:0 4px 8px rgba(0,0,0,0.3);line-height:1.1}.hero-subtitle{font-size:clamp(1.1rem,2.5vw,1.5rem);opacity:0.9;margin-bottom:var(--space-2xl);max-width:800px;margin-left:auto;margin-right:auto}.toc-container{background:var(--surface);border-radius:var(--card-radius);padding:var(--space-2xl);margin:var(--space-2xl) 0;box-shadow:var(--shadow-lg);border:1px solid var(--border);position:sticky;top:80px;z-index:100}.toc-header{text-align:center;margin-bottom:var(--space-xl);color:var(--text-primary)}.toc-header i{color:var(--primary);font-size:2rem;margin-right:var(--space-sm)}.toc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--space-lg);margin-top:var(--space-xl)}.toc-item{padding:var(--space-lg);border-radius:var(--card-radius);background:var(--bg-secondary);border-left:4px solid var(--primary);transition:all var(--transition-normal);cursor:pointer;min-height:80px;display:flex;align-items:center;text-decoration:none;color:var(--text-primary);position:relative;overflow:hidden}.toc-item::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:var(--gradient-primary);transition:left var(--transition-normal);z-index:1;opacity:0.1}.toc-item:hover::before{left:0}.toc-item:hover{transform:translateX(10px);color:var(--primary);box-shadow:var(--shadow-md)}.toc-item-content{position:relative;z-index:2;width:100%}.toc-item a{color:inherit;text-decoration:none;font-weight:500;display:flex;align-items:center;font-size:var(--font-size-base)}.toc-item a i{margin-right:var(--space-sm);font-size:1.2rem}.content-section{padding:var(--section-padding)}.feature-box{background:var(--surface);border-radius:var(--card-radius);padding:var(--space-2xl);margin-bottom:var(--space-3xl);box-shadow:var(--shadow-lg);border:1px solid var(--border);transition:all var(--transition-normal);position:relative;overflow:hidden;color:var(--text-primary)}.feature-box::before{content:'';position:absolute;top:0;left:0;width:100%;height:4px;background:var(--gradient-primary)}.feature-box:hover{transform:translateY(-5px);box-shadow:var(--shadow-xl)}.feature-box h2{color:var(--text-primary);margin-bottom:var(--space-xl);font-size:var(--font-size-3xl);font-weight:700;display:flex;align-items:center}.feature-box h2 i{color:var(--primary);margin-right:var(--space-md);font-size:var(--font-size-2xl)}.feature-box h3{color:var(--text-primary);margin:var(--space-2xl) 0 var(--space-lg) 0;font-size:var(--font-size-2xl);font-weight:600}.feature-box h4{color:var(--primary);margin:var(--space-xl) 0 var(--space-lg) 0;font-size:var(--font-size-xl);font-weight:600}.feature-box h5{color:var(--text-primary);margin:var(--space-lg) 0 var(--space-sm) 0;font-size:var(--font-size-lg);font-weight:600}.feature-box h6{color:var(--text-primary);margin:var(--space-md) 0 var(--space-sm) 0;font-size:var(--font-size-base);font-weight:600}.lead{font-size:var(--font-size-lg);font-weight:400;line-height:1.6;color:var(--text-secondary);margin-bottom:var(--space-xl)}.interactive-demo{background:var(--bg-secondary);border-radius:var(--card-radius);padding:var(--space-2xl);margin:var(--space-xl) 0;border:2px solid var(--border);position:relative;overflow:hidden}.interactive-demo::before{content:'';position:absolute;top:-50%;right:-50%;width:100%;height:100%;background:var(--gradient-primary);opacity:0.03;transform:rotate(45deg);pointer-events:none}.current-flow-animation{display:flex;justify-content:center;align-items:center;margin:var(--space-2xl) 0;position:relative;flex-wrap:wrap;gap:var(--space-lg)}.current-component{width:clamp(100px,15vw,140px);height:clamp(60px,10vw,90px);border-radius:var(--card-radius);margin:var(--space-sm);position:relative;transition:all var(--transition-normal);cursor:pointer;overflow:hidden;display:flex;align-items:center;justify-content:center;color:var(--text-inverse);font-weight:600;font-size:clamp(0.7rem,1.5vw,0.9rem);text-align:center;flex-shrink:0;box-shadow:var(--shadow-md)}.current-component::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.3),transparent);transition:left 2s ease-in-out}.current-component:hover::before{left:100%}.voltage-source{background:linear-gradient(135deg,#ff6b6b,#ee5a24);box-shadow:0 0 20px rgba(255,107,107,0.4)}.conductor{background:var(--gradient-primary);box-shadow:0 0 20px rgba(30,144,255,0.4)}.load-component{background:linear-gradient(135deg,#4834d4,#6c5ce7);box-shadow:0 0 20px rgba(72,52,212,0.4)}.current-arrow{position:relative;width:clamp(30px,5vw,50px);height:4px;background:var(--primary);border-radius:2px;animation:currentFlow 3s ease-in-out infinite}.current-arrow::after{content:'';position:absolute;right:-8px;top:-6px;width:0;height:0;border-left:12px solid var(--primary);border-top:7px solid transparent;border-bottom:7px solid transparent}.current-component:hover{transform:scale(1.05);box-shadow:var(--shadow-xl)}.type-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:var(--space-xl);margin:var(--space-2xl) 0}.type-card{background:var(--surface);border-radius:var(--card-radius);padding:var(--space-xl);box-shadow:var(--shadow-md);border:1px solid var(--border);transition:all var(--transition-normal);position:relative;overflow:hidden;color:var(--text-primary);min-height:280px;display:flex;flex-direction:column}.type-card::before{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:var(--gradient-primary);opacity:0;transition:opacity var(--transition-normal);z-index:1}.type-card:hover::before{opacity:0.05}.type-card:hover{transform:translateY(-10px) scale(1.02);box-shadow:var(--shadow-xl);border-color:var(--primary)}.type-card-content{position:relative;z-index:2;flex-grow:1;display:flex;flex-direction:column}.type-card-icon{font-size:clamp(2.5rem,4vw,3.5rem);color:var(--primary);margin-bottom:var(--space-lg);display:block}.type-card h4{color:var(--primary);margin-bottom:var(--space-lg);font-size:var(--font-size-xl);font-weight:600;flex-shrink:0}.type-card p{color:var(--text-secondary);margin-bottom:var(--space-lg);flex-shrink:0}.type-card ul{flex-grow:1;padding-left:var(--space-lg)}.type-card li{margin-bottom:var(--space-sm);color:var(--text-primary)}.enhanced-table{background:var(--surface);border-radius:var(--card-radius);overflow:hidden;overflow-x:auto;box-shadow:var(--shadow-lg);margin:var(--space-2xl) 0;border:1px solid var(--border)}.enhanced-table table{width:100%;min-width:600px;border-collapse:collapse;font-size:var(--font-size-sm)}.enhanced-table th{background:var(--gradient-primary);color:var(--text-inverse);padding:var(--space-lg);text-align:left;font-weight:600;font-size:var(--font-size-sm);white-space:nowrap;position:sticky;top:0;z-index:10}.enhanced-table td{padding:var(--space-lg);border-bottom:1px solid var(--border);transition:background-color var(--transition-fast);color:var(--text-primary);font-size:var(--font-size-sm);vertical-align:top}.enhanced-table tr:hover td{background-color:var(--bg-secondary)}.enhanced-table tr:last-child td{border-bottom:none}.enhanced-table strong{color:var(--primary);font-weight:600}.formula-box{background:var(--gradient-primary);color:var(--text-inverse);border-radius:var(--card-radius);padding:var(--space-2xl);margin:var(--space-2xl) 0;text-align:center;position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}.formula-box::before{content:'';position:absolute;top:-50%;right:-50%;width:100%;height:100%;background:rgba(255,255,255,0.1);transform:rotate(45deg);transition:all var(--transition-slow)}.formula-box:hover::before{right:-40%}.formula-text{font-family:'JetBrains Mono',monospace;font-size:clamp(1.2rem,3vw,2rem);font-weight:500;margin:0;position:relative;z-index:2;word-break:break-all;line-height:1.4}.formula-description{margin-top:var(--space-lg);font-size:var(--font-size-base);opacity:0.9;position:relative;z-index:2}.key-points-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:var(--space-xl);margin:var(--space-2xl) 0}.key-point{background:var(--surface);border-radius:var(--card-radius);padding:var(--space-xl);border-left:4px solid var(--success);box-shadow:var(--shadow-md);transition:all var(--transition-normal);color:var(--text-primary);position:relative;overflow:hidden}.key-point::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(30,144,255,0.1),transparent);transition:left var(--transition-slow)}.key-point:hover::before{left:100%}.key-point:hover{transform:translateX(10px);box-shadow:var(--shadow-lg)}.key-point-icon{color:var(--primary);font-size:2rem;margin-bottom:var(--space-lg);display:block}.key-point h5{color:var(--text-primary);font-weight:600;margin-bottom:var(--space-sm);font-size:var(--font-size-lg)}.key-point p{color:var(--text-secondary);line-height:1.6}.collapsible-header{cursor:pointer;padding:var(--space-lg);background:var(--bg-secondary);border-radius:var(--card-radius);margin-bottom:var(--space-sm);transition:all var(--transition-normal);display:flex;justify-content:space-between;align-items:center;color:var(--text-primary);font-size:var(--font-size-lg);font-weight:600;border:1px solid var(--border);box-shadow:var(--shadow-sm)}.collapsible-header:hover{background:var(--primary);color:var(--text-inverse);transform:translateY(-2px);box-shadow:var(--shadow-md)}.collapsible-content{max-height:0;overflow:hidden;transition:max-height var(--transition-slow),padding var(--transition-slow);background:var(--surface);border-radius:var(--card-radius);margin-bottom:var(--space-lg);color:var(--text-primary);border:1px solid var(--border)}.collapsible-content.active{max-height:10000px;padding:var(--space-2xl);box-shadow:var(--shadow-md)}.collapsible-icon{transition:transform var(--transition-normal);font-size:1.2rem}.collapsible-header.active .collapsible-icon{transform:rotate(180deg)}.alert-box{padding:var(--space-xl);border-radius:var(--card-radius);margin:var(--space-xl) 0;border-left:4px solid;color:var(--text-primary);font-size:var(--font-size-base);box-shadow:var(--shadow-sm);position:relative;overflow:hidden}.alert-box::before{content:'';position:absolute;top:0;left:0;width:4px;height:100%;background:inherit}.alert-info{background:rgba(30,144,255,0.1);border-color:var(--primary);color:var(--text-primary)}.alert-warning{background:rgba(255,140,0,0.1);border-color:var(--warning);color:var(--text-primary)}.alert-success{background:rgba(34,139,34,0.1);border-color:var(--success);color:var(--text-primary)}.alert-danger{background:rgba(220,20,60,0.1);border-color:var(--danger);color:var(--text-primary)}.alert-box h5,.alert-box h6{margin-bottom:var(--space-md);display:flex;align-items:center}.alert-box i{margin-right:var(--space-sm)}.alert-box ul{margin-bottom:0;padding-left:var(--space-lg)}.alert-box li{margin-bottom:var(--space-xs)}.example-box{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--card-radius);padding:var(--space-xl);margin:var(--space-xl) 0;color:var(--text-primary);position:relative;overflow:hidden}.example-box::before{content:'';position:absolute;top:0;left:0;width:100%;height:3px;background:var(--gradient-accent)}.example-box h6{color:var(--primary);margin-bottom:var(--space-md);font-weight:600;display:flex;align-items:center}.example-box h6 i{margin-right:var(--space-sm);color:var(--accent)}.example-box ul{margin-bottom:0;padding-left:var(--space-lg)}.example-box li{margin-bottom:var(--space-sm);line-height:1.5}.example-box strong{color:var(--primary)}.step-by-step{counter-reset:step-counter;margin:var(--space-xl) 0}.step-item{counter-increment:step-counter;position:relative;padding-left:3rem;margin-bottom:var(--space-xl);background:var(--surface-elevated);padding:var(--space-lg) var(--space-lg) var(--space-lg) 3.5rem;border-radius:var(--card-radius);box-shadow:var(--shadow-sm);border:1px solid var(--border);transition:all var(--transition-normal)}.step-item::before{content:counter(step-counter);position:absolute;left:var(--space-lg);top:var(--space-lg);width:2rem;height:2rem;background:var(--gradient-primary);color:var(--text-inverse);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:bold;font-size:var(--font-size-sm);flex-shrink:0;box-shadow:var(--shadow-sm)}.step-item:hover{transform:translateX(5px);box-shadow:var(--shadow-md)}.step-item strong{color:var(--primary);font-weight:600}.highlight-text{background:var(--gradient-primary);color:var(--text-inverse);padding:0.2rem 0.6rem;border-radius:0.25rem;font-weight:500;font-size:var(--font-size-base);display:inline-block;box-shadow:0 2px 4px rgba(30,144,255,0.2)}.converter-image{width:100%;max-width:720px;height:auto;border-radius:var(--card-radius);box-shadow:var(--shadow-lg);margin:var(--space-xl) auto;display:block;transition:transform var(--transition-normal)}.converter-image:hover{transform:scale(1.02)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:var(--space-md) var(--space-xl);border-radius:var(--button-radius);text-decoration:none;font-weight:500;transition:all var(--transition-normal);border:none;cursor:pointer;font-size:var(--font-size-base);font-family:inherit;box-shadow:var(--shadow-sm)}.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn:active{transform:translateY(0)}.btn-light{background:var(--text-inverse);color:var(--primary);border:2px solid transparent}.btn-light:hover{background:var(--bg-secondary);color:var(--primary)}.btn-outline-light{background:transparent;color:var(--text-inverse);border:2px solid var(--text-inverse)}.btn-outline-light:hover{background:var(--text-inverse);color:var(--primary)}.btn-lg{padding:var(--space-lg) var(--space-2xl);font-size:var(--font-size-lg)}.btn i{margin-right:var(--space-sm)}.breadcrumb{background:transparent;padding:0;margin-bottom:var(--space-lg);list-style:none;display:flex;flex-wrap:wrap}.breadcrumb-item{display:flex;align-items:center}.breadcrumb-item+.breadcrumb-item::before{content:'/';margin:0 var(--space-sm);color:rgba(255,255,255,0.5)}.breadcrumb-item a{color:rgba(255,255,255,0.7);text-decoration:none;transition:color var(--transition-normal)}.breadcrumb-item a:hover{color:var(--text-inverse)}.breadcrumb-item.active{color:var(--text-inverse)}.row{display:flex;flex-wrap:wrap;margin:0 -0.75rem}.col,.col-md-6,.col-md-8,.col-md-4,.col-lg-11{flex:0 0 auto;padding:0 0.75rem}.col{flex:1 0 0%}.col-md-4{width:33.333333%}.col-md-6{width:50%}.col-md-8{width:66.666667%}.col-lg-11{width:91.666667%}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.text-primary{color:var(--primary) !important}.text-secondary{color:var(--text-secondary) !important}.text-muted{color:var(--text-muted) !important}.text-white{color:var(--text-inverse) !important}.text-white-50{color:rgba(255,255,255,0.5) !important}.mb-0{margin-bottom:0 !important}.mb-3{margin-bottom:var(--space-lg) !important}.mb-4{margin-bottom:var(--space-xl) !important}.mt-2{margin-top:var(--space-sm) !important}.mt-3{margin-top:var(--space-lg) !important}.mt-4{margin-top:var(--space-xl) !important}.my-4{margin:var(--space-xl) 0 !important}.d-flex{display:flex !important}.d-block{display:block !important}.d-inline-block{display:inline-block !important}.justify-content-center{justify-content:center !important}.justify-content-between{justify-content:space-between !important}.align-items-center{align-items:center !important}.gap-3{gap:var(--space-lg) !important}@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes currentFlow{0%{opacity:0.3;transform:translateX(-30px)}50%{opacity:1;transform:translateX(0)}100%{opacity:0.3;transform:translateX(30px)}}@keyframes shimmer{0%{transform:translateX(-100%)}100%{transform:translateX(100%)}}.animate-pulse{animation:pulse 2s infinite}.flow-animation{animation:currentFlow 3s ease-in-out infinite}[data-theme="dark"] .hero-section{background:var(--gradient-primary)}[data-theme="dark"] .progress-bar{background:var(--gradient-primary);box-shadow:0 0 10px rgba(135,206,235,0.5)}[data-theme="dark"] .highlight-text{color:var(--text-inverse)}[data-theme="dark"] .alert-info{background:rgba(135,206,235,0.1);color:var(--text-primary)}[data-theme="dark"] .alert-warning{background:rgba(255,165,0,0.1);color:var(--text-primary)}[data-theme="dark"] .alert-success{background:rgba(0,255,127,0.1);color:var(--text-primary)}[data-theme="dark"] .alert-danger{background:rgba(255,99,71,0.1);color:var(--text-primary)}@media (min-width:1400px){:root{--container-max-width:1400px;--container-padding:2rem;--section-padding:4rem 0;--hero-height:70vh}.hero-title{font-size:4.5rem}.hero-subtitle{font-size:1.75rem}.type-grid{grid-template-columns:repeat(auto-fit,minmax(350px,1fr))}.enhanced-table th,.enhanced-table td{padding:1.5rem}}@media (min-width:1200px) and (max-width:1399px){:root{--container-padding:1.5rem}.type-grid{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}}@media (min-width:992px) and (max-width:1199px){:root{--container-padding:1.5rem;--section-padding:3rem 0}.hero-title{font-size:3rem}.type-grid{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.toc-grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.key-points-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}}@media (min-width:768px) and (max-width:991px){:root{--container-padding:1rem;--section-padding:2.5rem 0;--hero-height:50vh}.hero-title{font-size:2.5rem}.hero-subtitle{font-size:1.2rem}.toc-container{position:relative;top:auto}.type-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--space-lg)}.toc-grid{grid-template-columns:1fr}.key-points-grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.current-flow-animation{flex-direction:column;align-items:center}.current-arrow{transform:rotate(90deg);margin:var(--space-md) 0}.col-md-4,.col-md-6,.col-md-8{width:100%}.enhanced-table{font-size:var(--font-size-sm)}.feature-box{padding:var(--space-xl)}}@media (min-width:576px) and (max-width:767px){:root{--container-padding:1rem;--section-padding:2rem 0;--hero-height:45vh}.hero-title{font-size:2rem}.hero-subtitle{font-size:1.1rem}.type-grid{grid-template-columns:1fr;gap:var(--space-lg)}.toc-grid{grid-template-columns:1fr;gap:var(--space-md)}.key-points-grid{grid-template-columns:1fr;gap:var(--space-lg)}.theme-toggle{bottom:15px;right:15px;width:55px;height:55px;font-size:1.3rem}.back-to-top{bottom:75px;right:15px;width:45px;height:45px;font-size:1.1rem}.current-flow-animation{flex-direction:column;gap:var(--space-md)}.current-component{margin:var(--space-sm) 0}.enhanced-table th,.enhanced-table td{padding:var(--space-md)}.feature-box{padding:var(--space-xl)}.type-card{min-height:250px}}@media (max-width:575px){:root{--container-padding:0.75rem;--section-padding:1.5rem 0;--hero-height:40vh;--font-size-base:0.9rem;--font-size-lg:1rem;--font-size-xl:1.1rem;--font-size-2xl:1.3rem;--font-size-3xl:1.6rem}html{font-size:14px}.hero-title{font-size:1.8rem;line-height:1.1}.hero-subtitle{font-size:1rem}.type-grid{grid-template-columns:1fr;gap:var(--space-md)}.toc-grid{grid-template-columns:1fr;gap:var(--space-sm)}.toc-item{padding:var(--space-md);min-height:60px}.key-points-grid{grid-template-columns:1fr;gap:var(--space-md)}.theme-toggle{bottom:10px;right:10px;width:50px;height:50px;font-size:1.2rem}.back-to-top{bottom:65px;right:10px;width:40px;height:40px;font-size:1rem}.current-flow-animation{flex-direction:column;gap:var(--space-sm);margin:var(--space-lg) 0}.current-component{width:120px;height:60px;margin:var(--space-xs) 0;font-size:0.7rem}.current-arrow{display:none}.enhanced-table{font-size:0.8rem;border-radius:var(--input-radius)}.enhanced-table th,.enhanced-table td{padding:var(--space-sm)}.enhanced-table table{min-width:400px}.formula-text{font-size:1rem;word-break:break-all}.collapsible-header{padding:var(--space-md);font-size:var(--font-size-base)}.step-item{padding-left:2.5rem}.step-item::before{width:1.8rem;height:1.8rem;font-size:0.8rem;left:var(--space-sm)}.type-card{min-height:220px;padding:var(--space-lg)}.alert-box{padding:var(--space-lg);font-size:var(--font-size-sm)}.feature-box{padding:var(--space-lg)}.interactive-demo{padding:var(--space-lg)}.toc-container{padding:var(--space-lg)}.btn{padding:var(--space-sm) var(--space-lg);font-size:var(--font-size-sm)}.btn-lg{padding:var(--space-md) var(--space-xl);font-size:var(--font-size-base)}}@media (max-width:479px){:root{--container-padding:0.5rem;--space-sm:0.25rem;--space-md:0.5rem;--space-lg:0.75rem;--space-xl:1rem;--space-2xl:1.5rem}html{font-size:13px}.hero-title{font-size:1.6rem}.hero-subtitle{font-size:0.9rem}.feature-box{padding:var(--space-md)}.interactive-demo{padding:var(--space-md)}.current-component{width:100px;height:50px;font-size:0.6rem}.type-card{padding:var(--space-md);min-height:200px}}@media (max-width:320px){:root{--container-padding:0.25rem}html{font-size:12px}.theme-toggle{width:45px;height:45px;font-size:1rem}.back-to-top{width:35px;height:35px;font-size:0.9rem}.current-component{width:90px;height:45px;font-size:0.5rem}}@media (orientation:landscape) and (max-height:600px){.hero-section{min-height:80vh;padding:var(--space-xl) 0}.hero-title{font-size:clamp(1.8rem,4vw,2.5rem)}.hero-subtitle{font-size:clamp(0.9rem,2vw,1.1rem)}}@media (orientation:portrait) and (min-width:768px) and (max-width:1024px){.type-grid{grid-template-columns:repeat(2,1fr)}.key-points-grid{grid-template-columns:repeat(2,1fr)}.toc-grid{grid-template-columns:repeat(2,1fr)}}@media (prefers-reduced-motion:reduce){*{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important}.current-component::before{animation:none}.current-arrow{animation:none}}.toc-item:focus,.type-card:focus,.collapsible-header:focus,.theme-toggle:focus,.back-to-top:focus,.btn:focus{outline:2px solid var(--primary);outline-offset:2px}@media (hover:none) and (pointer:coarse){.toc-item:hover,.type-card:hover,.key-point:hover,.feature-box:hover,.current-component:hover{transform:none}.theme-toggle:hover,.back-to-top:hover,.btn:hover{transform:scale(1)}.step-item:hover{transform:none}}@media print{*{background:white !important;color:black !important;box-shadow:none !important}.theme-toggle,.back-to-top,.progress-container{display:none !important}.hero-section{background:white !important;color:black !important}.feature-box,.type-card,.enhanced-table{break-inside:avoid;page-break-inside:avoid}.hero-title,.feature-box h2,.feature-box h3{page-break-after:avoid}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--primary);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--secondary)}.loading{opacity:0.6;pointer-events:none}.loading::after{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.4),transparent);animation:shimmer 1.5s infinite}::selection{background:var(--primary);color:var(--text-inverse)}::-moz-selection{background:var(--primary);color:var(--text-inverse)}
/* ===== Topic-page UI refinements (2026-09): compact formula cards, readable FAQ, no oversized card icons ===== */
.content-section .formula-box{background:linear-gradient(135deg,#f5f9ff 0%,#eaf1fb 100%);color:#16233b;border:1px solid #d7e3f4;border-left:4px solid #2563eb;border-radius:12px;padding:.85rem 1.3rem;margin:1.15rem auto;width:fit-content;max-width:100%;text-align:center;box-shadow:0 2px 8px rgba(37,99,235,.08);overflow:hidden}
.content-section .formula-box::before{display:none}
.content-section .formula-box .formula-text{color:#12325c;font-size:clamp(1rem,2.4vw,1.4rem);font-weight:600;line-height:1.35;margin:0;word-break:normal;overflow-wrap:anywhere}
.content-section .formula-box .formula-description{margin-top:.45rem;color:#54637d;font-size:.9rem;opacity:1}
[data-theme="dark"] .content-section .formula-box{background:linear-gradient(135deg,#16233f 0%,#0f1a30 100%);color:#e8edf7;border-color:#26324b;border-left-color:#5b8cff;box-shadow:0 2px 10px rgba(0,0,0,.35)}
[data-theme="dark"] .content-section .formula-box .formula-text{color:#dbe6ff}
[data-theme="dark"] .content-section .formula-box .formula-description{color:#9fb0cc}
.content-section .collapsible-header h4{color:inherit;margin:0}
.content-section .collapsible-header:hover,.content-section .collapsible-header.active{background:#eaf1fb;color:#12325c;transform:none}
.content-section .collapsible-header:hover .collapsible-icon,.content-section .collapsible-header.active .collapsible-icon{color:#2563eb}
[data-theme="dark"] .content-section .collapsible-header:hover,[data-theme="dark"] .content-section .collapsible-header.active{background:#1c2c4d;color:#dbe6ff}
.content-section .type-card-icon{display:none !important}