*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:#f1f5f9;color:#1e293b;overflow:hidden;height:100vh}
#app{display:flex;height:100vh}

/* 侧边栏 */
#sidebar{width:220px;min-width:220px;background:linear-gradient(180deg,#1e293b 0%,#0f172a 100%);color:#fff;display:flex;flex-direction:column;transition:transform .3s ease;z-index:1001}
.sidebar-header{padding:18px 16px 12px;border-bottom:1px solid rgba(255,255,255,.08)}
.sidebar-logo{font-size:16px;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.sidebar-cats{flex:1;overflow-y:auto;padding:8px 0}
.sidebar-cats::-webkit-scrollbar{width:3px}
.sidebar-cats::-webkit-scrollbar-thumb{background:rgba(255,255,255,.15);border-radius:3px}
.cat-item{padding:10px 16px;cursor:pointer;font-size:14px;color:rgba(255,255,255,.65);transition:all .2s;display:flex;align-items:center;gap:8px;border-left:3px solid transparent}
.cat-item:hover{background:rgba(255,255,255,.06);color:#fff}
.cat-item.active{background:rgba(102,126,234,.15);color:#667eea;border-left-color:#667eea;font-weight:600}
.sidebar-footer{padding:12px 16px;border-top:1px solid rgba(255,255,255,.08)}
.user-info{font-size:12px;color:rgba(255,255,255,.45);margin-bottom:6px}
.sidebar-footer .login-btn{width:100%;padding:8px;border:none;border-radius:8px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:13px;cursor:pointer;transition:opacity .2s}
.sidebar-footer .login-btn:hover{opacity:.85}

/* 遮罩 */
#overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.4);z-index:1000}

/* 主区域 */
#main{flex:1;display:flex;flex-direction:column;min-width:0;height:100vh}
.top-bar{display:none;padding:12px 16px;background:#fff;border-bottom:1px solid #e2e8f0;align-items:center;gap:10px;position:sticky;top:0;z-index:100}
.menu-btn{background:none;border:none;font-size:22px;cursor:pointer;color:#475569;padding:2px 4px}
.top-title{font-size:15px;font-weight:600;color:#1e293b}
.content{flex:1;overflow-y:auto;padding:16px}
.content::-webkit-scrollbar{width:6px}
.content::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:3px}

/* 资源网格 */
.res-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
@media(max-width:640px){.res-grid{grid-template-columns:1fr}}
.res-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06);cursor:pointer;transition:all .25s;border:1px solid #f1f5f9}
.res-card:hover{box-shadow:0 4px 16px rgba(0,0,0,.1);transform:translateY(-2px);border-color:#e2e8f0}
.res-cover{width:100%;height:180px;object-fit:cover;display:block;background:#f1f5f9}
.res-cover-empty{width:100%;height:180px;background:linear-gradient(135deg,#667eea22,#764ba222);display:flex;align-items:center;justify-content:center;font-size:40px;color:#667eea44}
.res-body{padding:12px 14px 14px}
.res-name{font-size:14px;font-weight:600;color:#1e293b;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4;margin-bottom:4px}
.res-intro{font-size:12px;color:#94a3b8;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4}
.res-meta{display:flex;align-items:center;gap:8px;margin-top:8px;padding-top:8px;border-top:1px solid #f1f5f9;font-size:11px}
.res-type{padding:2px 8px;border-radius:4px;font-weight:500}
.res-type.article{background:#eff6ff;color:#3b82f6}
.res-type.video{background:#fef3c7;color:#d97706}
.res-type.file{background:#f0fdf4;color:#16a34a}
.res-pay{font-size:11px;padding:2px 8px;border-radius:4px;font-weight:500}
.res-pay.free{background:#f0fdf4;color:#16a34a}
.res-pay.vip{background:#fef2f2;color:#ef4444}
.res-pay.pay{background:#fef3c7;color:#d97706}
.res-date{color:#94a3b8;margin-left:auto}

/* 加载底部 */
.loading-more{display:flex;align-items:center;justify-content:center;padding:20px 0;gap:10px;font-size:13px;color:#94a3b8}
.loading-more .spin{width:20px;height:20px;border:2px solid #e2e8f0;border-top-color:#667eea;border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.load-end{text-align:center;padding:20px 0;font-size:12px;color:#cbd5e1}
.load-empty{text-align:center;padding:60px 20px;color:#94a3b8;font-size:14px}

/* 详情弹窗 */
.detail-overlay,.login-overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.45);z-index:9999;align-items:center;justify-content:center;padding:20px}
.detail-box{background:#fff;border-radius:14px;width:100%;max-width:680px;max-height:85vh;overflow:auto;padding:24px;position:relative;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.detail-close{position:absolute;top:14px;right:14px;width:30px;height:30px;border-radius:50%;border:none;background:#f1f5f9;font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#64748b;transition:all .2s;z-index:10}
.detail-close:hover{background:#e2e8f0;color:#1e293b}
.detail-cover{width:100%;max-height:320px;object-fit:cover;border-radius:10px;margin-bottom:16px;background:#f1f5f9}
.detail-title{font-size:18px;font-weight:700;margin-bottom:6px;line-height:1.4}
.detail-intro{font-size:13px;color:#64748b;margin-bottom:14px;line-height:1.5}
.detail-meta{display:flex;gap:10px;margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid #f1f5f9}
.detail-tag{font-size:11px;padding:3px 10px;border-radius:6px}
.detail-content{font-size:14px;line-height:1.8;color:#334155;white-space:pre-wrap;word-break:break-word}
.detail-content img{max-width:100%;border-radius:8px;margin:8px 0}
.detail-download{margin-top:20px;padding-top:16px;border-top:1px solid #e2e8f0}
.download-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:10px;font-size:14px;cursor:pointer;text-decoration:none;transition:opacity .2s}
.download-btn:hover{opacity:.85}
.vip-tip{padding:12px 16px;background:#fef2f2;border-radius:10px;font-size:13px;color:#ef4444}

/* 登录弹窗 */
.login-box{background:#fff;border-radius:14px;width:100%;max-width:380px;padding:30px 24px 24px;position:relative;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.login-title{font-size:18px;font-weight:700;text-align:center;margin-bottom:20px}
.login-tip{font-size:12px;color:#94a3b8;margin-bottom:4px}
.login-input{width:100%;padding:10px 12px;border:1px solid #e2e8f0;border-radius:8px;font-size:14px;margin-bottom:10px;outline:none;transition:border-color .2s}
.login-input:focus{border-color:#667eea}
.login-box .login-btn{display:block;padding:10px;border:none;border-radius:8px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:14px;cursor:pointer;text-align:center}

/* toast */
.toast{position:fixed;top:20px;left:50%;transform:translateX(-50%);padding:10px 20px;border-radius:10px;font-size:13px;z-index:99999;box-shadow:0 4px 16px rgba(0,0,0,.12);animation:toastIn .3s;max-width:400px;text-align:center}
.toast.s{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}
.toast.e{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.toast.w{background:#fffbeb;color:#92400e;border:1px solid #fde68a}
@keyframes toastIn{from{opacity:0;transform:translateX(-50%) translateY(-10px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}

/* 移动端适配 */
@media(max-width:768px){
  #sidebar{position:fixed;left:0;top:0;bottom:0;transform:translateX(-100%);z-index:1001}
  #sidebar.open{transform:translateX(0)}
  #overlay.show{display:block}
  .top-bar{display:flex}
  .res-grid{grid-template-columns:1fr}
}