.cluster-back{display:inline-flex;align-items:center;gap:6px;font-size:.85rem;font-weight:600;color:var(--accent);margin-bottom:20px;transition:gap var(--transition)}
.cluster-back:hover{gap:10px}
.cluster-back svg{flex-shrink:0}
.cluster-layout{max-width:800px;margin:0 auto;padding:48px 24px 0}
.cluster-toc{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:14px;padding:24px 28px;margin-bottom:40px}
.cluster-toc h2{font-size:.75rem;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;color:var(--text-light);margin-bottom:14px}
.cluster-toc-list{display:flex;flex-direction:column;gap:8px}
.cluster-toc-list a{font-size:.92rem;color:var(--text-mid);font-weight:500;transition:color var(--transition);padding:4px 0;border-bottom:1px solid transparent}
.cluster-toc-list a:hover{color:var(--accent)}
.cluster-body{margin-bottom:48px}
.cluster-body h2{font-size:1.4rem;font-weight:800;color:var(--dark);margin:40px 0 16px;line-height:1.3;letter-spacing:-.3px;padding-top:8px}
.cluster-body h3{font-size:1.1rem;font-weight:700;color:var(--dark);margin:28px 0 12px;line-height:1.4}
.cluster-body p{font-size:.97rem;color:var(--text-mid);line-height:1.75;margin-bottom:16px}
.cluster-body ul,.cluster-body ol{margin:0 0 20px;padding-left:0;list-style:none}
.cluster-body ul li,.cluster-body ol li{font-size:.95rem;color:var(--text-mid);line-height:1.7;padding:6px 0 6px 24px;position:relative}
.cluster-body ul li::before{content:'';position:absolute;left:6px;top:14px;width:7px;height:7px;border-radius:50%;background:var(--accent)}
.cluster-body ol{counter-reset:ol-counter}
.cluster-body ol li{counter-increment:ol-counter}
.cluster-body ol li::before{content:counter(ol-counter) '.';position:absolute;left:0;top:6px;font-weight:700;color:var(--accent);font-size:.9rem}
.cluster-body blockquote{border-left:4px solid var(--accent);padding:16px 20px;background:rgba(255,83,73,.04);border-radius:0 12px 12px 0;margin:20px 0;font-style:italic;color:var(--text)}
.cluster-body a{color:var(--accent);font-weight:600;text-decoration:underline;text-underline-offset:3px;transition:color var(--transition)}
.cluster-body a:hover{color:var(--accent-dark)}
.cluster-body strong{color:var(--dark);font-weight:700}
.cluster-cta{background:linear-gradient(135deg,var(--dark) 0%,#1B2E4A 100%);border-radius:20px;padding:36px 32px;margin:40px 0;text-align:center;position:relative;overflow:hidden}
.cluster-cta::before{content:'';position:absolute;top:-40%;right:-20%;width:50%;height:120%;background:radial-gradient(circle,rgba(255,83,73,.12) 0%,transparent 70%);pointer-events:none}
.cluster-cta h3{font-size:1.2rem;font-weight:800;color:#fff;margin-bottom:10px;position:relative;z-index:1}
.cluster-cta p{font-size:.93rem;color:rgba(255,255,255,.7);line-height:1.6;margin-bottom:20px;position:relative;z-index:1}
.cluster-cta .btn-cta{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;background:var(--accent);color:#fff;font-weight:800;font-size:.95rem;border-radius:14px;border:none;cursor:pointer;transition:all var(--transition);position:relative;z-index:1;text-decoration:none}
.cluster-cta .btn-cta:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,83,73,.3)}
.cluster-related{background:var(--bg);padding:64px 0}
.cluster-related .section-header{text-align:center;margin-bottom:36px}
.cluster-related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;max-width:1200px;margin:0 auto;padding:0 24px}
.cluster-related-card{display:flex;align-items:flex-start;gap:16px;padding:22px 20px;background:var(--card);border:1px solid var(--border);border-radius:14px;text-decoration:none;color:var(--dark);transition:all .25s ease}
.cluster-related-card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:var(--shadow-md)}
.cluster-related-card-icon{width:44px;height:44px;border-radius:12px;background:rgba(255,83,73,.08);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--accent)}
.cluster-related-card-text{flex:1;min-width:0}
.cluster-related-card-title{font-size:.92rem;font-weight:700;color:var(--dark);margin-bottom:4px;line-height:1.4}
.cluster-related-card-desc{font-size:.82rem;color:var(--text-mid);line-height:1.5}
.cluster-related-card-arrow{font-size:1.1rem;color:var(--accent);flex-shrink:0;align-self:center;transition:transform .2s}
.cluster-related-card:hover .cluster-related-card-arrow{transform:translateX(4px)}
.cluster-timeline{position:relative;padding-left:40px;margin:32px 0 40px}
.cluster-timeline::before{content:'';position:absolute;left:15px;top:8px;bottom:8px;width:2px;background:var(--border)}
.cluster-timeline-item{position:relative;margin-bottom:32px}
.cluster-timeline-item:last-child{margin-bottom:0}
.cluster-timeline-dot{position:absolute;left:-40px;top:2px;width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#FF7B6B);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:800;color:#fff;z-index:1;box-shadow:0 2px 8px rgba(255,83,73,.25)}
.cluster-timeline-content{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px 24px;transition:border-color .2s}
.cluster-timeline-content:hover{border-color:var(--accent)}
.cluster-timeline-content h3{font-size:1rem;font-weight:700;color:var(--dark);margin-bottom:8px}
.cluster-timeline-content p{font-size:.92rem;color:var(--text-mid);line-height:1.65;margin:0}
.cluster-checklist{margin:24px 0 32px;display:flex;flex-direction:column;gap:10px}
.cluster-checklist-item{display:flex;align-items:flex-start;gap:14px;padding:16px 20px;background:var(--card);border:1px solid var(--border);border-radius:12px;transition:border-color .2s}
.cluster-checklist-item:hover{border-color:var(--accent)}
.cluster-checklist-icon{width:28px;height:28px;border-radius:8px;background:rgba(16,185,129,.1);color:var(--green);display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.cluster-checklist-text{flex:1}
.cluster-checklist-text strong{display:block;font-size:.93rem;color:var(--dark);font-weight:700;margin-bottom:2px}
.cluster-checklist-text span{font-size:.85rem;color:var(--text-mid);line-height:1.5}
.cluster-factor-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;margin:32px 0 40px}
.cluster-factor-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:24px;transition:all .25s ease;position:relative}
.cluster-factor-card::after{content:'';position:absolute;bottom:0;left:24px;right:24px;height:3px;background:var(--accent);border-radius:3px;transform:scaleX(0);transition:transform .3s ease}
.cluster-factor-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.cluster-factor-card:hover::after{transform:scaleX(1)}
.cluster-factor-icon{width:48px;height:48px;border-radius:14px;background:rgba(255,83,73,.08);display:flex;align-items:center;justify-content:center;margin-bottom:14px;color:var(--accent)}
.cluster-factor-card h3{font-size:.95rem;font-weight:700;color:var(--dark);margin-bottom:8px}
.cluster-factor-card p{font-size:.88rem;color:var(--text-mid);line-height:1.6;margin:0}
.hub-explain{background:var(--bg);padding:72px 0}
.hub-explain-inner{max-width:800px;margin:0 auto}
.hub-explain h2{font-size:1.6rem;font-weight:800;color:var(--dark);margin-bottom:20px;line-height:1.3}
.hub-explain p{font-size:1rem;color:var(--text-mid);line-height:1.75;margin-bottom:14px}
.hub-explain p:last-child{margin-bottom:0}
.hub-section-link{display:inline-flex;align-items:center;gap:6px;color:var(--accent);font-weight:700;font-size:.93rem;margin-top:8px;transition:gap var(--transition)}
.hub-section-link:hover{gap:10px}
.hub-tips-list{list-style:none;padding:0;margin:24px 0 16px;display:flex;flex-direction:column;gap:14px}
.hub-tips-list li{display:flex;align-items:flex-start;gap:14px;font-size:.95rem;color:var(--text-mid);line-height:1.65}
.hub-tip-num{width:32px;height:32px;border-radius:50%;flex-shrink:0;background:linear-gradient(135deg,var(--accent),#FF7B6B);color:#fff;font-weight:800;font-size:.8rem;display:flex;align-items:center;justify-content:center}
.hub-cluster-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;margin-top:32px}
.cluster-situations{background:var(--bg-warm);padding:56px 0;border-top:1px solid var(--border)}
.cluster-situations .section-header{text-align:center;margin-bottom:32px}
.cluster-situations-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px;max-width:1200px;margin:0 auto;padding:0 24px}
.cluster-sit-card{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--card);border:1px solid var(--border);border-radius:12px;text-decoration:none;color:var(--dark);transition:all .2s;gap:12px}
.cluster-sit-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 16px rgba(255,83,73,.1)}
.cluster-sit-card.active{border-color:var(--accent);background:rgba(255,83,73,.04);pointer-events:none}
.cluster-sit-text{flex:1;min-width:0}
.cluster-sit-title{font-size:.88rem;font-weight:700;color:var(--dark);margin-bottom:3px;line-height:1.3}
.cluster-sit-sub{font-size:.78rem;color:var(--accent);font-weight:500;line-height:1.3}
.cluster-sit-arrow{font-size:1rem;color:var(--accent);flex-shrink:0;transition:transform .2s}
.cluster-sit-card:hover .cluster-sit-arrow{transform:translateX(4px)}