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var(--border);box-shadow:var(--shadow-sm)}.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.tag{display:inline-block;padding:4px 11px;border-radius:999px;font-size:.76rem;font-weight:500;background:var(--surface-2);color:var(--text-2);border:1px solid var(--border)}.back-to-top{position:fixed;bottom:22px;right:22px;z-index:150;width:40px;height:40px;border-radius:10px;background:var(--surface);border:1px solid var(--border);color:var(--text-2);cursor:pointer;box-shadow:var(--shadow);display:flex;align-items:center;justify-content:center;opacity:0;transform:translateY(8px);pointer-events:none;transition:opacity var(--t),transform var(--t),background var(--t),color var(--t)}.back-to-top svg{width:17px;height:17px}.back-to-top.visible{opacity:1;transform:none;pointer-events:auto}.back-to-top:hover{background:var(--primary);border-color:var(--primary);color:#fff}.site-footer{border-top:1px solid var(--border);background:var(--bg);transition:background var(--t),border-color var(--t)}.footer-inner{max-width:1280px;margin:0 auto;padding:18px 20px;display:flex;align-items:center;justify-content:space-between;font-size:.79rem;color:var(--text-3);flex-wrap:wrap;gap:6px}.footer-inner a{color:var(--text-2);text-decoration:none;font-weight:500;transition:color var(--t)}.footer-inner a:hover{color:var(--primary)}.footer-sep{margin:0 5px}@keyframes fade-up{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 1040px){.nav-hamburger{display:flex}.topnav-links{display:none;position:fixed;top:var(--nav-h);left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);flex-direction:column;align-items:stretch;padding:12px 14px 16px;gap:2px;box-shadow:var(--shadow-lg);z-index:199;animation:fade-up .18s ease both}.topnav-links.nav-open{display:flex}.topnav-links a{padding:10px 12px;font-size:.88rem;border-radius:8px}}@media (max-width: 920px){.layout-article{display:block}.toc-panel{position:fixed !important;top:0;bottom:0;left:-100%;width:min(300px, 82vw);max-height:none;border-radius:0 var(--radius-lg) var(--radius-lg) 0;z-index:300;transition:left var(--t);box-shadow:var(--shadow-lg)}.toc-panel.toc-open{left:0}.toc-close-btn{display:flex !important}.toc-fab{display:flex}}@media (max-width: 680px){.hero-section{padding:40px 26px}.hero-title{font-size:2rem}.hero-stats{gap:20px}.stat-item strong{font-size:1.35rem}.content-area{padding:26px 18px}.site-layout{padding:14px 14px 56px}.back-to-top{bottom:74px;right:14px}}@media (max-width: 480px){.guide-grid{grid-template-columns:1fr}.path-grid{grid-template-columns:1fr}.tips-grid{grid-template-columns:1fr}}@media print{.topnav,.toc-panel,.toc-fab,.back-to-top,.progress-bar{display:none !important}.layout-article{display:block !important}.content-area{box-shadow:none;padding:0;background:#fff}body{background:#fff;color:#000}.content-area a{color:#000}}