:root{--primary-color:#1677ff;--bg-color:#f7f9fb;--side-width:240px}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial;background:var(--bg-color);color:#333;line-height:1.85}a{color:var(--primary-color);text-decoration:none}a:hover{text-decoration:underline}.container{display:flex;gap:24px;max-width:1280px;margin:auto;padding:24px}.sidebar{width:var(--side-width);flex-shrink:0;background:#fff;border-radius:12px;padding:16px;box-shadow:0 4px 20px rgba(0,0,0,.05);position:sticky;top:24px;align-self:flex-start}.sidebar h3{margin-top:0;font-size:16px;padding-bottom:8px;border-bottom:1px solid #eee}.sidebar ul{list-style:none;padding-left:0;margin:0}.sidebar li{margin-bottom:8px}.sidebar a{display:block;padding:6px 10px;border-radius:6px;font-size:14px;color:#555}.sidebar a.active{background:var(--primary-color);color:#fff}.content{flex:1;min-width:0;background:#fff;border-radius:12px;padding:40px 48px;box-shadow:0 4px 20px rgba(0,0,0,.05)}.content h1{margin-top:0;font-size:clamp(26px,4vw,36px)}.content h2{margin-top:44px;font-size:24px;border-left:4px solid var(--primary-color);padding-left:12px}.content p{font-size:16px}.content table{width:100%;border-collapse:collapse;margin:28px 0;display:block;overflow-x:auto}.content th,.content td{border:1px solid #e5e7eb;padding:12px;text-align:center;font-size:14px}#backTop{position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:50%;background:var(--primary-color);color:#fff;border:none;cursor:pointer;display:none;font-size:20px;box-shadow:0 6px 16px rgba(0,0,0,.15)}@media (max-width:1100px){.container{flex-wrap:wrap}.sidebar{width:100%;position:static}.content{padding:32px}}footer{text-align:center;padding:24px;font-size:13px;color:#666}