:root{--primary-color: #0066cc;--success-color: #28a745;--warning-color: #ffc107;--danger-color: #dc3545;--bg-color: #f5f7fa;--card-bg: #ffffff;--text-primary: #2c3e50;--text-secondary: #6c757d;--border-color: #e0e6ed;--shadow: 0 2px 8px rgba(0,0,0,.08)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:var(--bg-color);color:var(--text-primary);line-height:1.6}#app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:var(--card-bg);border-bottom:1px solid var(--border-color);padding:1.5rem 2rem;box-shadow:var(--shadow)}.header-content{display:flex;justify-content:space-between;align-items:center}.header-title{font-size:1.75rem;font-weight:600;color:var(--primary-color)}.header-subtitle{font-size:.875rem;color:var(--text-secondary);margin-top:.25rem}.main-container{margin:2rem 0;padding:0 2rem;flex:1}.d8-layout{display:grid;grid-template-columns:240px 1fr;gap:0;min-height:calc(100vh - 140px);margin:0 -2rem}.d8-sidebar{background:#fff;color:var(--text-primary);position:sticky;top:80px;height:calc(100vh - 80px);overflow-y:auto;padding:1.5rem 1rem;box-shadow:2px 0 12px #00000014;border-right:1px solid var(--border-color)}.sidebar-header{display:flex;align-items:center;gap:.75rem;font-size:1.125rem;font-weight:600;padding:.75rem;margin-bottom:1.5rem;border-bottom:2px solid #f0f0f0;color:var(--primary-color)}.sidebar-header sl-icon{font-size:1.5rem;color:var(--primary-color)}.sidebar-progress{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:12px;padding:1.25rem;margin-bottom:1.5rem;box-shadow:0 4px 12px #667eea33;color:#fff}.progress-text{font-size:.75rem;text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem;opacity:.95;font-weight:600}.progress-bar{background:#ffffff40;height:10px;border-radius:5px;overflow:hidden;margin-bottom:.75rem;box-shadow:inset 0 1px 3px #0000001a}.progress-fill{background:linear-gradient(90deg,#10b981,#06b6d4);height:100%;transition:width .4s cubic-bezier(.4,0,.2,1);box-shadow:0 0 8px #10b98180}.progress-percent{font-size:1.5rem;font-weight:700;text-align:right;text-shadow:0 1px 2px rgba(0,0,0,.1)}.sidebar-nav{display:flex;flex-direction:column;gap:.5rem}.nav-item{display:flex;align-items:center;gap:.75rem;padding:.875rem 1rem;border-radius:10px;color:var(--text-secondary);text-decoration:none;transition:all .2s cubic-bezier(.4,0,.2,1);position:relative;background:#f8f9fa;border:1px solid transparent}.nav-item:hover{background:#f0f2f5;color:var(--text-primary);border-color:#e0e0e0;transform:translate(2px)}.nav-item.active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-weight:600;box-shadow:0 4px 12px #667eea4d;border-color:transparent}.nav-item.active:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:60%;background:#fff;border-radius:0 2px 2px 0;opacity:.8}.nav-item.completed{color:var(--text-tertiary);background:#f8f9fa}.nav-item.completed .nav-check{display:inline;color:#10b981;font-size:1rem}.nav-number{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:#e0e0e0;font-size:.875rem;font-weight:600;flex-shrink:0;color:var(--text-secondary);transition:all .2s ease}.nav-item:hover .nav-number{background:#d0d0d0;color:var(--text-primary)}.nav-item.active .nav-number{background:#ffffff40;color:#fff;box-shadow:0 0 0 2px #ffffff4d}.nav-item.completed .nav-number{background:#10b981;color:#fff}.nav-check{display:none;margin-left:auto}.d8-content{padding:2rem;overflow-y:auto}.mobile-nav-toggle{display:none}.card{background:var(--card-bg);border-radius:8px;padding:1.5rem;box-shadow:var(--shadow);margin-bottom:1.5rem}.card-title{font-size:1.25rem;font-weight:600;margin-bottom:1rem;color:var(--text-primary)}.case-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(350px,1fr));gap:1.5rem;margin-top:1.5rem}.case-card{background:var(--card-bg);border-radius:8px;padding:1.5rem;box-shadow:var(--shadow);border-left:4px solid var(--primary-color);transition:transform .2s,box-shadow .2s;cursor:pointer}.case-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001f}.case-header{display:flex;justify-content:space-between;align-items:start;margin-bottom:1rem}.case-number{font-size:1.125rem;font-weight:600;color:var(--primary-color)}.case-status{padding:.25rem .75rem;border-radius:12px;font-size:.75rem;font-weight:600}.status-ongoing{background:#fff3cd;color:#856404}.status-completed{background:#d4edda;color:#155724}.steps-container{margin-top:2rem}.step-card{background:var(--card-bg);border-radius:8px;padding:1.5rem;margin-bottom:1rem;border:2px solid var(--border-color);transition:border-color .3s}.step-card.active{border-color:var(--primary-color);box-shadow:0 0 0 3px #0066cc1a}.step-card.completed{border-color:var(--success-color);background:#f8fffe}.step-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.step-title{display:flex;align-items:center;gap:.75rem;font-size:1.125rem;font-weight:600}.step-number{width:36px;height:36px;border-radius:50%;background:var(--primary-color);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.875rem}.form-group{margin-bottom:1.5rem}.form-label{display:block;font-weight:600;margin-bottom:.5rem;color:var(--text-primary)}@media(max-width:1024px){.d8-layout{grid-template-columns:1fr}.d8-sidebar{position:fixed;top:0;left:-280px;width:280px;height:100vh;z-index:1000;transition:left .3s cubic-bezier(.4,0,.2,1);box-shadow:4px 0 20px #00000026;background:#fff}.d8-sidebar.mobile-open{left:0}.d8-sidebar.mobile-open:before{content:"";position:fixed;inset:0 0 0 280px;background:#0000004d;z-index:-1}.d8-content{padding:1.5rem 1rem}.mobile-nav-toggle{display:inline-flex!important}}@media(max-width:768px){.main-container{padding:0 1rem}.case-grid{grid-template-columns:1fr}.header-content{flex-direction:column;align-items:flex-start;gap:1rem}}.empty-state{text-align:center;padding:3rem 1rem;color:var(--text-secondary)}.empty-state-icon{font-size:3rem;margin-bottom:1rem;opacity:.5}.fishbone-container{background:#fff;border-radius:8px;padding:2rem;margin:1rem 0;min-height:400px}.why-chain{margin:1rem 0}.why-item{display:flex;gap:1rem;margin-bottom:1rem;align-items:start}.why-number{width:32px;height:32px;border-radius:50%;background:var(--primary-color);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;flex-shrink:0}.five-why-container{background:var(--card-bg);border-radius:8px;border:1px solid #e0e0e0;overflow:hidden;margin:1rem 0}.five-why-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1.25rem 1.5rem;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}.analysis-icon{width:48px;height:48px;background:#fff3;border-radius:12px;display:flex;align-items:center;justify-content:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.five-why-content{padding:1.5rem}.problem-statement-section{background:#fff3cd;border-left:4px solid var(--warning-color);padding:1.25rem;border-radius:8px;margin-bottom:1.5rem}.problem-statement-section .form-label{display:flex;align-items:center;gap:.5rem;font-size:1rem;margin-bottom:.75rem}.why-levels-container{margin:1.5rem 0}.why-chain{display:flex;flex-direction:column;gap:0}.why-level-card{position:relative;margin-bottom:0}.why-connector{width:3px;height:20px;background:linear-gradient(180deg,var(--primary-color) 0%,var(--success-color) 100%);margin-left:36px}.why-level-content{background:#fff;border:2px solid var(--border-color);border-radius:12px;padding:1.25rem;transition:all .3s ease;position:relative}.why-level-content:hover{border-color:var(--primary-color);box-shadow:0 4px 12px #0066cc26;transform:translate(4px)}.why-level-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;position:relative}.why-level-number{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--primary-color) 0%,var(--success-color) 100%);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.125rem;flex-shrink:0;box-shadow:0 2px 8px #0066cc4d}.why-level-header sl-button{margin-left:auto}.why-level-body{padding-left:0}.why-label{display:flex;align-items:center;gap:.5rem;font-size:.875rem;font-weight:600;color:var(--text-secondary);margin-bottom:.5rem}.why-arrow{display:flex;justify-content:center;align-items:center;height:30px;color:var(--success-color);font-size:1.5rem;animation:bounce 2s infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.root-cause-section{background:#d4edda;border-left:4px solid var(--success-color);padding:1.25rem;border-radius:8px;margin-top:1.5rem}.root-cause-section .form-label{display:flex;align-items:center;gap:.5rem;font-size:1rem;margin-bottom:.75rem;color:#155724}.usage-tips{margin-top:1.5rem}.usage-tips::part(base){border:1px solid var(--border-color);border-radius:8px}.usage-tips::part(header){padding:1rem;font-weight:600;background:#f8f9fa}.usage-tips::part(content){padding:0}@media(max-width:768px){.five-why-header{flex-direction:column;align-items:flex-start}.why-level-content{padding:1rem}.why-level-number{width:36px;height:36px;font-size:1rem}}.horizontal-radio-group::part(form-control){display:flex;flex-direction:row;gap:1rem}.horizontal-radio-group::part(form-control-label){flex-basis:100%}