:root{--color-primary:#2563eb;--color-primary-hover:#1d4ed8;--color-text:#1f2937;--color-text-muted:#6b7280;--color-border:#e5e7eb;--color-bg:#f9fafb;--color-white:#ffffff;--font-sans:"Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body{overflow-x:hidden}body{font-family:var(--font-sans);font-size:14px;color:var(--color-text);background:var(--color-bg);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}.site-header{background:var(--color-white);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:100;padding:0 24px}.header-inner{max-width:1400px;margin:0 auto;padding:0;height:56px;display:flex;align-items:center;justify-content:space-between}.menu-toggle{display:none;width:40px;height:40px;padding:0;border:none;background:0 0;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px}.menu-toggle span{display:block;width:22px;height:2px;background:var(--color-text)}.logo{display:inline-flex;align-items:center;text-decoration:none;gap:8px;flex-shrink:0}.logo img{height:32px;width:32px;object-fit:cover;border-radius:8px}.logo-text{font-size:20px;font-weight:800;letter-spacing:-.5px;line-height:1}.logo-ai{color:#1e3a8a}.logo-db{color:#f97316}.main-nav{display:flex;gap:24px}.main-nav a{color:var(--color-text-muted);text-decoration:none;font-size:.875rem;font-weight:600}.main-nav a:hover,.main-nav a.active{color:var(--color-primary)}.drawer-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:200;opacity:0;transition:opacity .3s}.drawer-overlay.open{opacity:1}.drawer{position:fixed;top:0;left:0;width:260px;max-width:85vw;height:100vh;background:var(--color-white);z-index:201;transform:translateX(-100%);transition:transform .3s ease;box-shadow:2px 0 12px rgba(0,0,0,.15)}.drawer.open{transform:translateX(0)}.drawer-header{padding:20px;border-bottom:1px solid var(--color-border)}.drawer-header .logo{font-size:1.2rem}.drawer-nav{padding:16px 0}.drawer-nav a{display:block;padding:14px 24px;color:var(--color-text);text-decoration:none;font-size:1rem;font-weight:600}.drawer-nav a:hover,.drawer-nav a.active{color:var(--color-primary);background:rgba(37,99,235,6%)}@media(max-width:900px){.menu-toggle{display:flex!important}.main-nav{display:none}.site-header{padding:0 16px}.header-inner .logo{flex:1;text-align:center}.drawer-overlay{display:block;pointer-events:none}.drawer-overlay.open{pointer-events:auto}}.page-main{flex:1}.page-inner{max-width:1400px;margin:0 auto}.site-footer{margin-top:auto;background:var(--color-white);border-top:1px solid var(--color-border);padding:24px}.footer-inner{max-width:1400px;margin:0 auto;text-align:center;color:var(--color-text-muted);font-size:.875rem}.footer-inner p+p{margin-top:8px}.footer-nav{display:flex;justify-content:center;gap:24px;margin-bottom:12px}.footer-nav a{color:var(--color-text-muted);text-decoration:none;font-size:.875rem;font-weight:600;transition:color .2s}.footer-nav a:hover{color:var(--color-primary)}.footer-legal{display:flex;justify-content:center;gap:20px;margin-bottom:10px}.footer-legal a{color:var(--color-text-muted);text-decoration:none;font-size:.8125rem;transition:color .2s}.footer-legal a:hover{color:var(--color-primary)}.icp-beian{margin-top:6px;font-size:.75rem;color:var(--color-text-muted)}.icp-beian a{color:var(--color-text-muted);text-decoration:none;transition:color .2s}.icp-beian a:hover{color:var(--color-primary)}.search-clear-btn{display:flex;align-items:center;justify-content:center;width:28px;height:28px;margin-right:4px;border:none;background:#e5e7eb;color:#6b7280;border-radius:50%;font-size:1rem;line-height:1;cursor:pointer;flex-shrink:0;transition:background .15s,color .15s}.search-clear-btn:hover{background:#d1d5db;color:#374151}