:root{--bg:#f6f7f9;--card:#ffffff;--text:#101828;--muted:#475467;--line:#d0d5dd;--brand:#0f766e;--brand-2:#115e59;--danger:#b42318;--nav-reserved-height:84px}*{box-sizing:border-box}body,html{margin:0;padding:0;background:radial-gradient(circle at top right,#e5f4f1 0,var(--bg) 42%);color:var(--text);font-family:PingFang SC,Microsoft YaHei,Noto Sans CJK SC,sans-serif}a{color:inherit;text-decoration:none}.site-wrap{min-height:100vh}.container{width:min(1120px,92vw);margin:0 auto}.app-body{display:grid;grid-template-columns:248px minmax(0,1fr);grid-gap:28px;gap:28px;align-items:start}.left-sidebar-slot{width:248px;align-self:start}.top-nav{position:-webkit-sticky;position:sticky;top:0;z-index:20;border-bottom:1px solid var(--line);background:rgba(255,255,255,.92);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.top-nav-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:64px;padding:10px 0}.brand{font-weight:700;letter-spacing:.2px}.nav-links{display:flex;align-items:center;gap:14px;overflow-x:auto;white-space:nowrap;font-size:14px;color:var(--muted)}.nav-links a:hover{color:var(--brand-2)}.left-sidebar{position:-webkit-sticky;position:sticky;top:calc(var(--nav-reserved-height) + 12px);width:248px;background:radial-gradient(145% 120% at -12% -18%,rgba(16,185,129,.2) 0,rgba(16,185,129,0) 42%),radial-gradient(145% 120% at 118% 115%,rgba(30,64,175,.28) 0,rgba(30,64,175,0) 45%),linear-gradient(165deg,#0b1220,#121a2c 52%,#0d1626);border:1px solid rgba(148,163,184,.22);border-radius:18px;color:#f1f5f9;overflow:hidden;box-shadow:0 24px 52px rgba(2,6,23,.35),inset 0 1px 0 rgba(255,255,255,.08);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.left-sidebar,.sidebar-scroll{max-height:calc(100vh - var(--nav-reserved-height) - 24px)}.sidebar-scroll{overflow:auto}.sidebar-category{border-top:1px solid rgba(148,163,184,.17)}.sidebar-root-link{display:block;padding:12px 15px;font-size:16px;color:#dbe6f5;transition:background-color .18s ease,color .18s ease,padding-left .18s ease}.sidebar-root-link.active,.sidebar-root-link:hover{background:linear-gradient(90deg,rgba(59,130,246,.24),rgba(14,165,233,.1));color:#ffffff;padding-left:18px}.sidebar-sublist{border-top:1px solid rgba(148,163,184,.2);background:rgba(2,6,23,.35);padding:8px 9px}.sidebar-subitem{display:block;color:#d2deef;font-size:14px;line-height:1.35;padding:9px 10px;border-radius:10px;transition:background-color .16s ease,color .16s ease,transform .16s ease}.sidebar-subitem.active,.sidebar-subitem:hover{color:#fff;background:linear-gradient(90deg,rgba(56,189,248,.24),rgba(56,189,248,.08));transform:translateX(2px)}.sidebar-empty{padding:8px;color:#a7b6ca;font-size:13px}.sidebar-scroll::-webkit-scrollbar{width:8px}.sidebar-scroll::-webkit-scrollbar-thumb{background:rgba(148,163,184,.45);border-radius:8px}.main-content{min-width:0}.hero{padding:56px 0 22px}.hero h1{margin:0;font-size:clamp(28px,5vw,46px);line-height:1.1}.hero p{color:var(--muted);max-width:700px;margin-top:14px;margin-bottom:0}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-gap:16px;gap:16px;padding:12px 0 36px}.category-title{margin:14px 0 0;font-size:22px}.card{border:1px solid var(--line);border-radius:14px;background:var(--card);padding:18px}.card h3{margin:0 0 8px;font-size:19px}.card p{margin:0;color:var(--muted);font-size:14px;line-height:1.5}.card-link{margin-top:16px;display:inline-block;color:var(--brand-2);font-size:14px;font-weight:600}.tool-page{padding:34px 0 56px}.tool-page h1{margin:0;font-size:clamp(24px,4.2vw,34px)}.tool-page p{color:var(--muted);margin:12px 0 0}.panel{margin-top:22px;border:1px solid var(--line);background:var(--card);border-radius:14px;padding:18px}.label{display:block;font-size:13px;color:var(--muted);margin-bottom:8px}.select,.text-input,.textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:#fff;font:inherit}.textarea{min-height:150px;resize:vertical}.row{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px}.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.btn{border:0;background:var(--brand);color:white;border-radius:9px;padding:9px 14px;font-weight:600;cursor:pointer}.btn:hover{background:var(--brand-2)}.btn.ghost{border:1px solid var(--line);color:var(--text);background:white}.output{margin-top:14px;border:1px dashed var(--line);border-radius:10px;min-height:104px;padding:12px;background:#fafafa;white-space:pre-wrap}.error{color:var(--danger);font-size:14px}.error,.tip{margin-top:10px}.tip{font-size:12px}.footer,.tip{color:var(--muted)}.footer{border-top:1px solid var(--line);font-size:13px;padding:18px 0 24px;margin-top:8px}@media (max-width:940px){.app-body{grid-template-columns:1fr}.left-sidebar-slot{width:auto}.left-sidebar{position:static;left:auto;transform:none;width:auto}.left-sidebar,.sidebar-scroll{max-height:none}}@media (max-width:700px){.row{grid-template-columns:1fr}}