:root {
      --color-aws-dark: #232F3E;
      --color-aws-orange: #dc7600;
      --color-aws-orange-original: #FF9900;
      --color-aws-orange-hover: #EC7211;
      --color-text-primary: #374151;
      --color-text-secondary: #6B7280;
      --color-text-tertiary: #6f7682;
      --color-text-white: #FFFFFF;
      --color-bg-light: #F9FAFB;
      --color-bg-white: #FFFFFF;
      --color-bg-dark: #1F2937;
      --color-bg-gradient-start: #232F3E;
      --color-bg-gradient-end: #374151;
      --color-border: #909296;
      --color-border-light: #E5E7EB;
      --color-success: #10B981;
      --color-warning: #F59E0B;
      --color-error: #EF4444;
      --color-info: #3B82F6;
      --spacing-xs: 5px;
      --spacing-sm: 10px;
      --spacing-md: 15px;
      --spacing-base: 20px;
      --spacing-lg: 25px;
      --spacing-xl: 30px;
      --spacing-2xl: 40px;
      --spacing-3xl: 60px;
      --header-height: 60px;
      --container-max-width: 1200px;
      --font-weight-normal: 400;
      --font-weight-medium: 500;
      --font-weight-semibold: 600;
      --font-weight-bold: 700;
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-base: 10px;
      --radius-lg: 15px;
      --radius-xl: 20px;
      --radius-full: 50%;
      --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
      --shadow-lg: 0 10px 40px rgba(0,0,0,0.2);
      --shadow-orange: 0 4px 12px rgba(255,153,0,0.4);
      --shadow-orange-hover: 0 6px 20px rgba(255,153,0,0.6);
      --transition-base: 0.3s ease;
      --z-header: 1002;
      --z-progress-bar: 1001;
      --z-scroll-top: 1000;
    }
    *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
    body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Hiragino Kaku Gothic ProN','Noto Sans JP',sans-serif;font-size:20px;line-height:1.75;color:var(--color-text-primary);background:var(--color-bg-light);padding-top:var(--header-height)}

    /* Header */
    .fixed-nav-header{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:linear-gradient(135deg,var(--color-bg-gradient-start),var(--color-bg-gradient-end));box-shadow:0 2px 10px rgba(0,0,0,0.3);z-index:var(--z-header);display:flex;align-items:center}
    .fixed-nav-container{width:100%;max-width:var(--container-max-width);margin:0 auto;padding:0 var(--spacing-xl);display:flex;align-items:center;justify-content:space-between}
    .fixed-nav-logo{font-size:1.3em;font-weight:var(--font-weight-bold);color:var(--color-aws-orange-original);text-decoration:none;display:flex;align-items:center;gap:8px}
    .fixed-nav-links{display:flex;gap:20px;align-items:center}
    .fixed-nav-links a{color:var(--color-text-white);text-decoration:none;font-weight:var(--font-weight-medium);font-size:0.85em;padding:8px 14px;border-radius:var(--radius-sm);transition:all var(--transition-base);white-space:nowrap}
    .fixed-nav-links a:hover{background:rgba(255,153,0,0.2);color:var(--color-aws-orange-original)}

    /* Progress Bar */
    .reading-progress{position:fixed;top:var(--header-height);left:0;width:100%;height:4px;background:var(--color-border-light);z-index:var(--z-progress-bar);opacity:0;transition:opacity var(--transition-base)}
    .reading-progress.show{opacity:1}
    .reading-progress-bar{height:100%;background:linear-gradient(90deg,var(--color-aws-orange-original),var(--color-aws-orange-hover));width:0%;transition:width 0.1s ease}

    /* Scroll Top */
    .scroll-to-top{position:fixed;bottom:var(--spacing-xl);right:var(--spacing-xl);width:50px;height:50px;background:linear-gradient(135deg,var(--color-aws-orange-original),var(--color-aws-orange-hover));color:#fff;border:none;border-radius:var(--radius-full);font-size:1.5em;cursor:pointer;box-shadow:var(--shadow-orange);opacity:0;visibility:hidden;transition:all var(--transition-base);z-index:var(--z-scroll-top);display:flex;align-items:center;justify-content:center}
    .scroll-to-top.show{opacity:1;visibility:visible}
    .scroll-to-top:hover{transform:translateY(-5px);box-shadow:var(--shadow-orange-hover)}

    /* Container */
    .container{max-width:var(--container-max-width);margin:0 auto;padding:var(--spacing-2xl) var(--spacing-xl)}

    /* TOC */
    .toc{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-2xl);box-shadow:var(--shadow-sm);border-left:4px solid var(--color-aws-orange)}
    .toc h2{font-size:1.4em;margin-bottom:var(--spacing-md);color:var(--color-aws-dark);border-bottom:none;padding-bottom:0}
    .toc ol{list-style:none;counter-reset:toc;padding-left:0}
    .toc ol li{counter-increment:toc;margin-bottom:var(--spacing-sm)}
    .toc ol li::before{content:counter(toc) ". ";color:var(--color-aws-orange);font-weight:var(--font-weight-bold)}
    .toc a{color:var(--color-text-primary);text-decoration:none;transition:color var(--transition-base)}
    .toc a:hover{color:var(--color-aws-orange)}

    /* Hero */
    .hero{background:linear-gradient(135deg,var(--color-bg-gradient-start),var(--color-bg-gradient-end));border-radius:var(--radius-xl);padding:var(--spacing-3xl) var(--spacing-2xl);margin-bottom:var(--spacing-2xl);color:#fff;text-align:center;box-shadow:var(--shadow-lg)}
    .hero-emoji{font-size:3em;margin-bottom:var(--spacing-base)}
    .hero h1{font-size:2em;margin-bottom:var(--spacing-md);color:#fff;line-height:1.3}
    .hero-subtitle{font-size:1.1em;opacity:0.9;max-width:800px;margin:0 auto var(--spacing-xl)}
    .hero-tags{display:flex;justify-content:center;flex-wrap:wrap;gap:var(--spacing-sm)}
    .hero-tag{background:rgba(255,153,0,0.2);color:var(--color-aws-orange-original);padding:6px 18px;border-radius:var(--radius-xl);font-size:0.9em;font-weight:var(--font-weight-semibold);border:1px solid rgba(255,153,0,0.3)}

    /* Key Takeaways */
    .key-takeaways{background:linear-gradient(135deg,#FFF7ED,#FFFBF5);border-radius:var(--radius-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-2xl);border:2px solid var(--color-aws-orange-original);box-shadow:var(--shadow-sm)}
    .key-takeaways h2{font-size:1.4em;color:var(--color-aws-dark);margin-bottom:var(--spacing-md);border-bottom:none;padding-bottom:0}
    .takeaway-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-md)}
    .takeaway-item{background:#fff;border-radius:var(--radius-base);padding:var(--spacing-md);display:flex;align-items:flex-start;gap:var(--spacing-sm);box-shadow:var(--shadow-xs)}
    .takeaway-icon{font-size:1.5em;flex-shrink:0;line-height:1}
    .takeaway-text{font-size:0.95em;line-height:1.6}

    /* Section */
    .content-section{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-2xl);box-shadow:var(--shadow-sm)}
    .content-section h2{font-size:1.5em;color:var(--color-aws-dark);margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-sm);border-bottom:3px solid var(--color-aws-orange)}
    .content-section h3{font-size:1.2em;color:var(--color-text-primary);margin-bottom:var(--spacing-md);margin-top:var(--spacing-lg)}
    .content-section p{margin-bottom:var(--spacing-md);line-height:1.75}

    /* Analogy Table */
    .analogy-table-wrapper{overflow-x:auto;margin:var(--spacing-lg) 0}
    .analogy-table{width:100%;border-collapse:collapse;font-size:0.95em}
    .analogy-table thead th{background:var(--color-aws-dark);color:#fff;padding:14px 18px;text-align:left;font-weight:var(--font-weight-semibold)}
    .analogy-table tbody td{padding:14px 18px;border-bottom:1px solid var(--color-border-light);vertical-align:top}
    .analogy-table tbody tr:nth-child(even){background:var(--color-bg-light)}
    .analogy-table tbody tr:hover{background:#FFF7ED}

    /* Cards */
    .card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-base);margin:var(--spacing-lg) 0}
    .card-grid-3{grid-template-columns:repeat(3,1fr)}
    .card-grid-4{grid-template-columns:repeat(4,1fr)}
    .info-card{background:var(--color-bg-light);border-radius:var(--radius-base);padding:var(--spacing-base);border:1px solid var(--color-border-light);transition:all var(--transition-base)}
    .info-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
    .info-card-header{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}
    .info-card-emoji{font-size:1.6em}
    .info-card-title{font-size:1.05em;font-weight:var(--font-weight-bold);color:var(--color-aws-dark)}
    .info-card-body{font-size:0.9em;line-height:1.7;color:var(--color-text-secondary)}
    .info-card.feature{border-left:4px solid var(--color-aws-orange)}
    .info-card.blue{border-left:4px solid var(--color-info)}
    .info-card.green{border-left:4px solid var(--color-success)}
    .info-card.red{border-left:4px solid var(--color-error)}
    .info-card.yellow{border-left:4px solid var(--color-warning)}
    .info-card.purple{border-left:4px solid #8B5CF6}

    /* SVG Container */
    .svg-container{margin:var(--spacing-lg) 0;overflow-x:auto}
    .svg-container svg{display:block;margin:0 auto;max-width:100%;height:auto}

    /* Callout */
    .callout{border-radius:var(--radius-base);padding:var(--spacing-base);margin:var(--spacing-lg) 0;display:flex;align-items:flex-start;gap:var(--spacing-sm)}
    .callout-icon{font-size:1.4em;flex-shrink:0;line-height:1}
    .callout-body{font-size:0.95em;line-height:1.7}
    .callout.tip{background:#ECFDF5;border:1px solid #34D399}
    .callout.warning{background:#FFFBEB;border:1px solid #FBBF24}
    .callout.danger{background:#FEF2F2;border:1px solid #F87171}
    .callout.info{background:#EFF6FF;border:1px solid #60A5FA}

    /* Comparison */
    .comparison-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-base);margin:var(--spacing-lg) 0}
    .comparison-col{border-radius:var(--radius-base);padding:var(--spacing-base)}
    .comparison-col.good{background:#ECFDF5;border:2px solid #34D399}
    .comparison-col.bad{background:#FEF2F2;border:2px solid #F87171}
    .comparison-col h3{font-size:1.1em;margin-bottom:var(--spacing-sm);margin-top:0}
    .comparison-item{font-size:0.9em;padding:8px 0;border-bottom:1px solid rgba(0,0,0,0.06);line-height:1.6}
    .comparison-item:last-child{border-bottom:none}

    /* Code Tabs */
    .code-tabs{margin:var(--spacing-lg) 0;border-radius:var(--radius-base);overflow:hidden;border:1px solid var(--color-border-light)}
    .code-tab-buttons{display:flex;background:var(--color-bg-dark);overflow-x:auto}
    .code-tab-btn{padding:12px 24px;background:transparent;color:#fff;border:none;cursor:pointer;font-size:0.85em;font-weight:var(--font-weight-medium);opacity:0.6;transition:all var(--transition-base);white-space:nowrap;font-family:inherit}
    .code-tab-btn.active{opacity:1;background:rgba(255,153,0,0.2);border-bottom:2px solid var(--color-aws-orange-original)}
    .code-tab-btn:hover{opacity:0.9}
    .code-tab-content{display:none}
    .code-tab-content.active{display:block}
    .code-tab-content pre{margin:0;padding:var(--spacing-base);background:#1a1a2e;color:#E5E7EB;font-family:'SFMono-Regular',Consolas,monospace;font-size:0.8em;line-height:1.6;overflow-x:auto}

    /* FAQ */
    .faq-item{border:1px solid var(--color-border-light);border-radius:var(--radius-base);margin-bottom:var(--spacing-sm);overflow:hidden}
    .faq-question{width:100%;background:var(--color-bg-light);border:none;padding:var(--spacing-md) var(--spacing-base);text-align:left;font-size:0.95em;font-weight:var(--font-weight-semibold);cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-sm);color:var(--color-text-primary);transition:background var(--transition-base);font-family:inherit}
    .faq-question:hover{background:#FFF7ED}
    .faq-question .arrow{transition:transform var(--transition-base);flex-shrink:0;font-size:0.8em}
    .faq-question.open .arrow{transform:rotate(180deg)}
    .faq-answer{display:none;padding:var(--spacing-md) var(--spacing-base);font-size:0.9em;line-height:1.7;background:#fff;color:var(--color-text-secondary)}
    .faq-answer.open{display:block}

    /* Exam Tips */
    .exam-tips{background:linear-gradient(135deg,#EFF6FF,#F0F9FF);border-radius:var(--radius-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-2xl);border:2px solid #60A5FA;box-shadow:var(--shadow-sm)}
    .exam-tips h2{color:#1E40AF;border-bottom:3px solid #60A5FA}
    .exam-tip-item{background:#fff;border-radius:var(--radius-base);padding:var(--spacing-md);margin-bottom:var(--spacing-sm);border-left:4px solid #3B82F6}
    .exam-tip-item strong{color:#1E40AF}

    /* Cheatsheet */
    .cheatsheet{background:linear-gradient(135deg,var(--color-bg-gradient-start),#2D3748);border-radius:var(--radius-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-2xl);color:#fff;box-shadow:var(--shadow-lg)}
    .cheatsheet h2{color:var(--color-aws-orange-original);border-bottom:2px solid rgba(255,153,0,0.3)}
    .cheatsheet-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-md);margin-top:var(--spacing-lg)}
    .cheatsheet-item{background:rgba(255,255,255,0.08);border-radius:var(--radius-base);padding:var(--spacing-md);border:1px solid rgba(255,255,255,0.1)}
    .cheatsheet-item-title{font-size:0.95em;font-weight:var(--font-weight-bold);color:var(--color-aws-orange-original);margin-bottom:6px}
    .cheatsheet-item-body{font-size:0.85em;opacity:0.9;line-height:1.6}

    /* Glossary */
    .glossary-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-sm);margin-top:var(--spacing-md)}
    .glossary-item{background:var(--color-bg-light);border-radius:var(--radius-sm);padding:var(--spacing-sm) var(--spacing-md);border-left:3px solid var(--color-info)}
    .glossary-term{font-weight:var(--font-weight-bold);color:var(--color-aws-dark);font-size:0.9em}
    .glossary-def{font-size:0.85em;color:var(--color-text-secondary);line-height:1.5}

    /* Step Flow */
    .step-flow{display:flex;align-items:center;gap:0;margin:var(--spacing-lg) 0;overflow-x:auto;padding:var(--spacing-sm) 0}
    .step-item{flex:1;min-width:140px;text-align:center;padding:var(--spacing-md);background:var(--color-bg-light);border-radius:var(--radius-base);border:2px solid var(--color-border-light)}
    .step-number{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--color-aws-orange-original);color:#fff;border-radius:var(--radius-full);font-weight:var(--font-weight-bold);font-size:0.9em;margin-bottom:8px}
    .step-label{font-size:0.85em;font-weight:var(--font-weight-semibold);color:var(--color-text-primary)}
    .step-arrow{flex-shrink:0;font-size:1.5em;color:var(--color-aws-orange);padding:0 6px}

    /* Helpers */
    .highlight{color:var(--color-aws-orange);font-weight:var(--font-weight-bold)}
    .tag-inline{display:inline-block;background:#EEF2FF;color:#4338CA;padding:2px 10px;border-radius:12px;font-size:0.85em;font-weight:var(--font-weight-semibold)}
    .svg-caption{text-align:center;font-size:0.85em;color:var(--color-text-secondary);margin-top:8px;font-style:italic}

    @media(max-width:768px){
      body{font-size:18px}
      .hero h1{font-size:1.5em}
      .takeaway-grid,.card-grid,.card-grid-3,.card-grid-4,.comparison-grid,.cheatsheet-grid,.glossary-grid{grid-template-columns:1fr}
      .fixed-nav-links{display:none}
      .step-flow{flex-direction:column}
      .step-arrow{transform:rotate(90deg)}
      /* SVG responsive: horizontal scroll with readable minimum width */
      .svg-container{-webkit-overflow-scrolling:touch;overflow-x:auto;padding-bottom:var(--spacing-sm)}
      .svg-container svg{min-width:800px}
      .svg-container::after{content:'← 横にスクロールできます →';display:block;text-align:center;font-size:0.75em;color:var(--color-text-tertiary);margin-top:6px;opacity:0.7}
    }