: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-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;
      --spacing-4xl: 80px;
      --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, 0.15);
      --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;
      --header-height: 60px;
      --container-max-width: 1200px;
      --z-header: 1002;
      --z-progress-bar: 1001;
      --z-scroll-top: 1000;
    }

    *, *::before, *::after { box-sizing: border-box; }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
      font-size: 20px;
      line-height: 1.5;
      color: var(--color-text-primary);
      margin: 0;
      padding: var(--spacing-base);
      padding-top: var(--spacing-4xl);
      background-color: var(--color-bg-light);
    }

    .skip-link {
      position: absolute; top: -40px; left: 0;
      background: var(--color-aws-orange); color: var(--color-text-white);
      padding: 8px 16px; text-decoration: none; border-radius: 0 0 4px 0;
      font-weight: var(--font-weight-bold); z-index: var(--z-scroll-top);
    }
    .skip-link:focus { top: 0; }

    /* ========== Fixed Nav ========== */
    .fixed-nav-header {
      position: fixed; top: 0; left: 0; right: 0;
      height: var(--header-height);
      background: linear-gradient(135deg, var(--color-bg-gradient-start) 0%, var(--color-bg-gradient-end) 100%);
      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: 18px;
      padding: 8px 14px; border-radius: var(--radius-sm);
      transition: all var(--transition-base);
    }
    .fixed-nav-links a:hover { background: rgba(255,153,0,0.2); color: var(--color-aws-orange-original); }

    /* ========== Progress ========== */
    .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);
    }
    .reading-progress-bar {
      height: 100%; width: 0%;
      background: linear-gradient(90deg, var(--color-aws-orange-original), var(--color-aws-orange-hover));
      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: white; border: none; border-radius: var(--radius-full);
      font-size: 24px; 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);
      background: var(--color-bg-white); border-radius: 16px;
      box-shadow: var(--shadow-lg);
    }

    /* ========== Breadcrumb ========== */
    .breadcrumb-nav {
      background: rgba(255,255,255,0.95); padding: 15px 25px;
      border-radius: var(--radius-base); margin-bottom: var(--spacing-xl);
      display: flex; flex-wrap: wrap; align-items: center;
      gap: var(--spacing-sm); box-shadow: var(--shadow-sm); font-size: 20px;
    }
    .breadcrumb-home { color: var(--color-aws-orange); text-decoration: none; font-weight: var(--font-weight-semibold); }
    .breadcrumb-separator { color: var(--color-text-tertiary); user-select: none; }
    .breadcrumb-current { color: var(--color-aws-orange); font-weight: var(--font-weight-bold); }

    /* ========== Hero ========== */
    .hero {
      background: linear-gradient(135deg, #232F3E 0%, #37475A 50%, #485769 100%);
      color: white; padding: var(--spacing-3xl) var(--spacing-2xl);
      border-radius: var(--radius-xl); margin-bottom: var(--spacing-2xl);
      text-align: center; position: relative; overflow: hidden;
    }
    .hero::before {
      content: ''; position: absolute; top: -50%; left: -50%;
      width: 200%; height: 200%;
      background: radial-gradient(ellipse at 30% 50%, rgba(255,153,0,0.08), transparent 60%);
      pointer-events: none;
    }
    .hero-badge {
      display: inline-block; background: rgba(255,153,0,0.2);
      color: var(--color-aws-orange-original); padding: 8px 20px;
      border-radius: 25px; font-size: 20px; font-weight: var(--font-weight-semibold);
      margin-bottom: var(--spacing-base); border: 1px solid rgba(255,153,0,0.3);
    }
    .hero h1 { font-size: 2.2em; margin: 0 0 var(--spacing-md) 0; color: white; line-height: 1.3; }
    .hero-subtitle { font-size: 22px; color: rgba(255,255,255,0.85); max-width: 800px; margin: 0 auto; line-height: 1.6; }

    /* ========== Key Takeaways ========== */
    .key-takeaways {
      background: linear-gradient(135deg, #FFF7ED 0%, #FFFBF0 100%);
      border: 2px solid var(--color-aws-orange-original);
      border-radius: var(--radius-xl); padding: var(--spacing-2xl);
      margin-bottom: var(--spacing-2xl);
    }
    .key-takeaways h2 {
      color: var(--color-aws-orange); font-size: 1.5em;
      margin: 0 0 var(--spacing-lg) 0; text-align: center;
      border-bottom: none; padding-bottom: 0;
    }
    .takeaway-grid {
      display: grid; grid-template-columns: repeat(2, 1fr);
      gap: var(--spacing-base);
    }
    .takeaway-card {
      background: white; border-radius: var(--radius-lg); padding: var(--spacing-lg);
      box-shadow: var(--shadow-sm); border-top: 5px solid;
      display: flex; flex-direction: column; gap: var(--spacing-sm);
    }
    .takeaway-card:nth-child(1) { border-top-color: #EF4444; }
    .takeaway-card:nth-child(2) { border-top-color: #3B82F6; }
    .takeaway-card:nth-child(3) { border-top-color: #10B981; }
    .takeaway-card:nth-child(4) { border-top-color: #8B5CF6; }
    .takeaway-card .tk-icon { font-size: 36px; }
    .takeaway-card .tk-title { font-size: 22px; font-weight: var(--font-weight-bold); color: var(--color-text-primary); }
    .takeaway-card .tk-desc { font-size: 20px; color: var(--color-text-secondary); line-height: 1.5; }

    /* ========== TOC ========== */
    .toc {
      background: var(--color-bg-light); border-radius: var(--radius-lg);
      padding: var(--spacing-lg); margin-bottom: var(--spacing-2xl);
      border: 1px solid var(--color-border-light);
    }
    .toc h2 {
      font-size: 1.3em; margin: 0 0 var(--spacing-md) 0;
      color: var(--color-text-primary); text-align: center;
      border-bottom: none; padding-bottom: 0;
    }
    .toc-list {
      list-style: none; padding: 0; margin: 0;
      display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
    }
    .toc-list li a {
      display: block; padding: 10px 15px; border-radius: var(--radius-sm);
      text-decoration: none; color: var(--color-text-primary);
      font-size: 20px; transition: all var(--transition-base);
      background: white; border: 1px solid var(--color-border-light);
    }
    .toc-list li a:hover {
      background: #FFF7ED; border-color: var(--color-aws-orange-original);
      color: var(--color-aws-orange);
    }

    /* ========== Section ========== */
    .section {
      margin-bottom: var(--spacing-2xl); background: white;
      padding: var(--spacing-2xl); border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
    }
    .section h2 {
      font-size: 1.6em; color: var(--color-text-primary);
      border-bottom: 3px solid var(--color-aws-orange);
      padding-bottom: var(--spacing-sm); margin: 0 0 var(--spacing-lg) 0;
    }
    .section h3 {
      font-size: 1.3em; color: var(--color-text-primary);
      margin: var(--spacing-xl) 0 var(--spacing-md) 0;
    }
    .section p { font-size: 20px; line-height: 1.7; margin-bottom: var(--spacing-md); }
    .section-header { display: flex; align-items: center; gap: var(--spacing-md); margin-bottom: var(--spacing-lg); }
    .section-icon { font-size: 28px; flex-shrink: 0; }
    .section-header h2 { margin-bottom: 0; }

    /* ========== SVG Container ========== */
    .svg-container {
      background: var(--color-bg-light); border-radius: var(--radius-lg);
      padding: var(--spacing-base); margin: var(--spacing-lg) 0;
      border: 1px solid var(--color-border-light); overflow-x: auto;
    }
    .svg-container svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
    .svg-caption {
      text-align: center; font-size: 20px; color: var(--color-text-secondary);
      margin-top: var(--spacing-sm); font-style: italic;
    }

    /* ========== Analogy Table ========== */
    .analogy-table {
      width: 100%; border-collapse: separate; border-spacing: 0;
      margin: var(--spacing-lg) 0; border-radius: var(--radius-base);
      overflow: hidden; border: 2px solid var(--color-border-light);
      font-size: 20px;
    }
    .analogy-table thead th {
      background: var(--color-aws-dark); color: var(--color-text-white);
      padding: 15px 20px; font-weight: var(--font-weight-bold);
      text-align: left;
    }
    .analogy-table tbody td {
      padding: 14px 20px; 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:last-child td { border-bottom: none; }

    /* ========== Info Box ========== */
    .info-box {
      padding: var(--spacing-base) var(--spacing-lg); border-radius: var(--radius-base);
      margin: var(--spacing-lg) 0; font-size: 20px; line-height: 1.6;
    }
    .info-box-title { font-weight: var(--font-weight-bold); margin-bottom: 8px; font-size: 20px; }
    .info-box.tip { background: #ECFDF5; border-left: 5px solid var(--color-success); }
    .info-box.warning { background: #FEF3C7; border-left: 5px solid var(--color-warning); }
    .info-box.danger { background: #FEF2F2; border-left: 5px solid var(--color-error); }
    .info-box.note { background: #EFF6FF; border-left: 5px solid var(--color-info); }

    /* ========== VS Panel ========== */
    .vs-panel {
      display: grid; grid-template-columns: 1fr auto 1fr;
      gap: 0; margin: var(--spacing-lg) 0;
      border-radius: var(--radius-lg); overflow: hidden;
      border: 2px solid var(--color-border-light);
    }
    .vs-side { padding: var(--spacing-lg); }
    .vs-side.left { background: linear-gradient(135deg, #ECFDF5, #F0FFF4); }
    .vs-side.right { background: linear-gradient(135deg, #FEF2F2, #FFF5F5); }
    .vs-divider {
      display: flex; align-items: center; justify-content: center;
      background: var(--color-aws-dark); color: var(--color-aws-orange-original);
      font-weight: var(--font-weight-bold); font-size: 24px;
      writing-mode: vertical-rl; padding: 0 12px;
    }
    .vs-side h3 {
      font-size: 24px; margin: 0 0 var(--spacing-md) 0;
      display: flex; align-items: center; gap: 10px;
    }
    .vs-side.left h3 { color: #059669; }
    .vs-side.right h3 { color: var(--color-error); }
    .vs-side ul { padding-left: var(--spacing-lg); margin: 0; }
    .vs-side li { font-size: 20px; line-height: 1.6; margin-bottom: 8px; }

    /* ========== Direction Cards ========== */
    .direction-grid {
      display: grid; grid-template-columns: repeat(2, 1fr);
      gap: var(--spacing-base); margin: var(--spacing-lg) 0;
    }
    .direction-card {
      border-radius: var(--radius-lg); padding: var(--spacing-lg);
      text-align: center; position: relative; overflow: hidden;
    }
    .direction-card.outbound {
      background: linear-gradient(135deg, #EEF2FF, #F0F4FF);
      border: 2px solid #818CF8;
    }
    .direction-card.inbound {
      background: linear-gradient(135deg, #FFF7ED, #FFFBF0);
      border: 2px solid #FDBA74;
    }
    .direction-card .dir-icon { font-size: 48px; margin-bottom: var(--spacing-sm); }
    .direction-card .dir-title { font-size: 24px; font-weight: var(--font-weight-bold); margin-bottom: 6px; }
    .direction-card .dir-sub { font-size: 20px; color: var(--color-text-secondary); margin-bottom: var(--spacing-md); }
    .direction-card .dir-method {
      display: inline-block; background: white;
      padding: 10px 20px; border-radius: 25px;
      font-size: 22px; font-weight: var(--font-weight-bold);
      box-shadow: var(--shadow-sm);
    }
    .direction-card.outbound .dir-method { color: #4338CA; border: 2px solid #818CF8; }
    .direction-card.inbound .dir-method { color: #9A3412; border: 2px solid #FDBA74; }

    /* ========== Attribute Cards ========== */
    .attr-grid {
      display: grid; grid-template-columns: repeat(3, 1fr);
      gap: var(--spacing-base); margin: var(--spacing-lg) 0;
    }
    .attr-card {
      background: white; border-radius: var(--radius-lg);
      padding: var(--spacing-lg); border: 2px solid;
      text-align: center;
    }
    .attr-card.lp { border-color: #3B82F6; }
    .attr-card.asp { border-color: #10B981; }
    .attr-card.med { border-color: #F59E0B; }
    .attr-card .attr-icon { font-size: 40px; margin-bottom: var(--spacing-sm); }
    .attr-card .attr-name { font-size: 22px; font-weight: var(--font-weight-bold); margin-bottom: 6px; }
    .attr-card .attr-analogy { font-size: 20px; color: var(--color-text-secondary); margin-bottom: var(--spacing-sm); font-style: italic; }
    .attr-card .attr-rule {
      display: inline-block; padding: 6px 14px;
      border-radius: 20px; font-size: 20px; font-weight: var(--font-weight-semibold);
    }
    .attr-card.lp .attr-rule { background: #EFF6FF; color: #1D4ED8; }
    .attr-card.asp .attr-rule { background: #ECFDF5; color: #047857; }
    .attr-card.med .attr-rule { background: #FEF3C7; color: #92400E; }

    /* ========== Community Tag Cards ========== */
    .community-grid {
      display: grid; grid-template-columns: repeat(3, 1fr);
      gap: var(--spacing-base); margin: var(--spacing-lg) 0;
    }
    .community-card {
      border-radius: var(--radius-lg); padding: var(--spacing-lg);
      text-align: center; border: 2px solid;
    }
    .community-card.low { background: #FEF2F2; border-color: #F87171; }
    .community-card.mid { background: #FEF3C7; border-color: #FBBF24; }
    .community-card.high { background: #ECFDF5; border-color: #34D399; }
    .community-card .comm-tag { font-size: 28px; font-weight: var(--font-weight-bold); margin-bottom: 6px; font-family: 'Courier New', monospace; }
    .community-card.low .comm-tag { color: #DC2626; }
    .community-card.mid .comm-tag { color: #D97706; }
    .community-card.high .comm-tag { color: #059669; }
    .community-card .comm-label { font-size: 20px; font-weight: var(--font-weight-semibold); margin-bottom: 4px; }
    .community-card .comm-desc { font-size: 20px; color: var(--color-text-secondary); }

    /* ========== Step Flow ========== */
    .step-flow {
      display: flex; align-items: flex-start; gap: var(--spacing-base);
      margin: var(--spacing-lg) 0; flex-wrap: nowrap;
    }
    .step-item {
      flex: 1; background: white; border-radius: var(--radius-lg);
      padding: var(--spacing-base); border: 2px solid var(--color-border-light);
      text-align: center; position: relative;
    }
    .step-item::after {
      content: '→'; position: absolute; right: -22px; top: 50%;
      transform: translateY(-50%); font-size: 28px; color: var(--color-aws-orange);
      font-weight: var(--font-weight-bold);
    }
    .step-item:last-child::after { display: none; }
    .step-num {
      display: inline-flex; align-items: center; justify-content: center;
      width: 36px; height: 36px; background: var(--color-aws-dark);
      color: var(--color-aws-orange-original); border-radius: var(--radius-full);
      font-weight: var(--font-weight-bold); font-size: 20px; margin-bottom: 8px;
    }
    .step-title { font-size: 20px; font-weight: var(--font-weight-bold); margin-bottom: 4px; }
    .step-desc { font-size: 20px; color: var(--color-text-secondary); line-height: 1.4; }

    /* ========== 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-aws-dark); }
    .code-tab-btn {
      background: transparent; border: none; color: rgba(255,255,255,0.7);
      padding: 14px 24px; font-size: 20px; font-weight: var(--font-weight-medium);
      cursor: pointer; transition: all var(--transition-base);
      border-bottom: 3px solid transparent;
    }
    .code-tab-btn.active {
      color: var(--color-aws-orange-original);
      border-bottom-color: var(--color-aws-orange-original);
      background: rgba(255,153,0,0.1);
    }
    .code-panel { display: none; background: #1a1a2e; padding: var(--spacing-base); overflow-x: auto; }
    .code-panel.active { display: block; }
    .code-panel pre {
      margin: 0; font-family: 'Courier New', Consolas, monospace;
      font-size: 20px; line-height: 1.5; color: #e0e0e0; white-space: pre;
    }
    .code-comment { color: #6a9955; }
    .code-keyword { color: #569cd6; }
    .code-string { color: #ce9178; }
    .code-value { color: #b5cea8; }

    /* ========== Practice Grid ========== */
    .practice-grid {
      display: grid; grid-template-columns: repeat(2, 1fr);
      gap: var(--spacing-base); margin: var(--spacing-lg) 0;
    }
    .practice-card { padding: var(--spacing-lg); border-radius: var(--radius-lg); }
    .practice-card.good { background: #ECFDF5; border: 2px solid var(--color-success); }
    .practice-card.bad { background: #FEF2F2; border: 2px solid var(--color-error); }
    .practice-card h3 {
      margin: 0 0 var(--spacing-md) 0; font-size: 22px;
      display: flex; align-items: center; gap: 8px;
    }
    .practice-card.good h3 { color: #059669; }
    .practice-card.bad h3 { color: var(--color-error); }
    .practice-card ul { padding-left: var(--spacing-lg); margin: 0; }
    .practice-card li { margin-bottom: 8px; line-height: 1.5; font-size: 20px; }

    /* ========== Exam Tips ========== */
    .exam-tips {
      background: linear-gradient(135deg, #EEF2FF, #F0F4FF);
      border: 2px solid #818CF8; border-radius: var(--radius-xl);
      padding: var(--spacing-2xl); margin-bottom: var(--spacing-2xl);
    }
    .exam-tips h2 {
      color: #4338CA; font-size: 1.5em;
      margin: 0 0 var(--spacing-lg) 0; text-align: center;
      border-bottom: none; padding-bottom: 0;
    }
    .exam-tip-item {
      background: white; border-radius: var(--radius-lg);
      padding: var(--spacing-lg); margin-bottom: var(--spacing-base);
      border-left: 5px solid #818CF8;
    }
    .exam-tip-item:last-child { margin-bottom: 0; }
    .exam-tip-q { font-weight: var(--font-weight-bold); color: #4338CA; margin-bottom: 8px; font-size: 20px; }
    .exam-tip-a { color: var(--color-text-primary); font-size: 20px; line-height: 1.6; }

    /* ========== FAQ Accordion ========== */
    .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-base) var(--spacing-lg);
      font-size: 20px; font-weight: var(--font-weight-semibold);
      color: var(--color-text-primary); cursor: pointer;
      text-align: left; display: flex; justify-content: space-between;
      align-items: center; transition: background var(--transition-base);
    }
    .faq-question:hover { background: #FFF7ED; }
    .faq-question::after { content: '+'; font-size: 24px; color: var(--color-aws-orange); font-weight: var(--font-weight-bold); transition: transform var(--transition-base); }
    .faq-item.active .faq-question::after { content: '−'; }
    .faq-answer {
      display: none; padding: var(--spacing-base) var(--spacing-lg);
      font-size: 20px; line-height: 1.7; color: var(--color-text-secondary);
      border-top: 1px solid var(--color-border-light);
    }
    .faq-item.active .faq-answer { display: block; }

    /* ========== Cheat Sheet ========== */
    .cheat-sheet {
      background: linear-gradient(135deg, #232F3E, #37475A);
      color: white; border-radius: var(--radius-xl);
      padding: var(--spacing-2xl); margin-bottom: var(--spacing-2xl);
    }
    .cheat-sheet h2 {
      color: var(--color-aws-orange-original); font-size: 1.5em;
      margin: 0 0 var(--spacing-lg) 0; text-align: center;
      border-bottom: none; padding-bottom: 0;
    }
    .cheat-grid {
      display: grid; grid-template-columns: repeat(2, 1fr);
      gap: var(--spacing-base);
    }
    .cheat-card {
      background: rgba(255,255,255,0.08); border-radius: var(--radius-lg);
      padding: var(--spacing-base); border: 1px solid rgba(255,255,255,0.15);
    }
    .cheat-card h3 { color: var(--color-aws-orange-original); margin: 0 0 8px 0; font-size: 20px; }
    .cheat-card p { color: rgba(255,255,255,0.85); font-size: 20px; margin: 0; line-height: 1.5; }

    /* ========== Evaluation Order ========== */
    .eval-flow {
      display: flex; align-items: center; justify-content: center;
      gap: 0; margin: var(--spacing-lg) 0; flex-wrap: wrap;
    }
    .eval-step {
      padding: 14px 24px; border-radius: var(--radius-base);
      font-weight: var(--font-weight-bold); font-size: 20px;
      text-align: center; color: white;
    }
    .eval-arrow {
      font-size: 28px; color: var(--color-text-tertiary);
      padding: 0 6px; font-weight: var(--font-weight-bold);
    }
    .eval-step.s1 { background: #3B82F6; }
    .eval-step.s2 { background: #10B981; }
    .eval-step.s3 { background: #F59E0B; color: #1F2937; }
    .eval-step.s4 { background: #8B5CF6; }

    /* ========== Troubleshooting ========== */
    .ts-grid {
      display: grid; grid-template-columns: repeat(2, 1fr);
      gap: var(--spacing-base); margin: var(--spacing-lg) 0;
    }
    .ts-card {
      background: white; border-radius: var(--radius-lg);
      padding: var(--spacing-lg); border: 1px solid var(--color-border-light);
    }
    .ts-card .ts-symptom { font-weight: var(--font-weight-bold); color: var(--color-error); margin-bottom: 8px; font-size: 20px; }
    .ts-card .ts-cause { color: var(--color-text-secondary); margin-bottom: 8px; font-size: 20px; }
    .ts-card .ts-fix { color: var(--color-success); font-weight: var(--font-weight-semibold); font-size: 20px; }

    /* ========== Glossary ========== */
    .glossary-grid {
      display: grid; grid-template-columns: repeat(2, 1fr);
      gap: var(--spacing-sm); margin: var(--spacing-lg) 0;
    }
    .glossary-item {
      padding: 12px var(--spacing-base); background: var(--color-bg-light);
      border-radius: var(--radius-sm); border-left: 4px solid var(--color-aws-orange);
    }
    .glossary-term { font-weight: var(--font-weight-bold); color: var(--color-text-primary); font-size: 20px; }
    .glossary-def { font-size: 20px; color: var(--color-text-secondary); }

    /* ========== Footer ========== */
    .page-footer {
      text-align: center; padding: var(--spacing-xl);
      color: var(--color-text-tertiary); font-size: 20px;
      border-top: 1px solid var(--color-border-light);
      margin-top: var(--spacing-2xl);
    }