/* ===== 公开页面样式 - 极简、干净、大气 ===== */
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;background:#f8fafc;color:#1e293b;line-height:1.6;min-height:100vh;}
.container{max-width:900px;margin:0 auto;padding:20px 16px;}

/* 头部 */
.header{text-align:center;padding:40px 0 24px;border-bottom:1px solid #e2e8f0;margin-bottom:24px;}
.site-title{font-size:1.8rem;font-weight:700;color:#0f172a;margin-bottom:4px;}
.site-desc{font-size:0.95rem;color:#64748b;}

/* 工具栏 */
.toolbar{margin-bottom:20px;display:flex;flex-direction:column;gap:12px;}
.search-box input{width:100%;padding:10px 16px;border:1px solid #e2e8f0;border-radius:8px;font-size:0.95rem;outline:none;transition:border-color .2s;}
.search-box input:focus{border-color:#2563eb;}
.category-filter{display:flex;flex-wrap:wrap;gap:8px;}
.cat-btn{padding:6px 14px;border:1px solid #e2e8f0;border-radius:20px;background:#fff;cursor:pointer;font-size:0.85rem;color:#64748b;transition:all .2s;}
.cat-btn:hover{border-color:#2563eb;color:#2563eb;}
.cat-btn.active{background:#2563eb;color:#fff;border-color:#2563eb;}

/* 文件卡片 */
.file-list{display:flex;flex-direction:column;gap:12px;}
.file-card{display:flex;align-items:center;gap:16px;padding:16px 20px;background:#fff;border:1px solid #e2e8f0;border-radius:10px;transition:box-shadow .2s;}
.file-card:hover{box-shadow:0 2px 12px rgba(0,0,0,0.06);}
.file-icon{font-size:2rem;flex-shrink:0;}
.file-info{flex:1;min-width:0;}
.file-name{font-size:0.95rem;font-weight:600;color:#0f172a;word-break:break-all;}
.file-meta{display:flex;flex-wrap:wrap;gap:6px;font-size:0.8rem;color:#94a3b8;margin-top:4px;}
.file-cat{background:#eff6ff;color:#2563eb;padding:1px 8px;border-radius:10px;font-size:0.75rem;}
.file-desc{font-size:0.85rem;color:#64748b;margin-top:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.file-actions{display:flex;gap:8px;flex-shrink:0;}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:8px 16px;border:none;border-radius:8px;cursor:pointer;font-size:0.9rem;font-weight:500;text-decoration:none;transition:all .2s;}
.btn-primary{background:#2563eb;color:#fff;}
.btn-primary:hover{background:#1d4ed8;}
.btn-secondary{background:#f1f5f9;color:#475569;border:1px solid #e2e8f0;}
.btn-secondary:hover{background:#e2e8f0;}
.btn-ghost{background:transparent;color:#64748b;padding:8px;}
.btn-ghost:hover{background:#f1f5f9;}
.btn-sm{padding:6px 12px;font-size:0.8rem;}
.btn-lg{padding:12px 28px;font-size:1rem;}

/* 分页 */
.pagination{display:flex;justify-content:center;gap:6px;margin-top:24px;}
.page-btn{padding:6px 12px;border:1px solid #e2e8f0;border-radius:6px;background:#fff;cursor:pointer;font-size:0.85rem;}
.page-btn:hover{border-color:#2563eb;color:#2563eb;}
.page-btn.active{background:#2563eb;color:#fff;border-color:#2563eb;}
.page-dots{padding:6px 8px;color:#94a3b8;}

/* 预览页 */
.preview-container{display:flex;flex-direction:column;align-items:center;padding-top:60px;}
.preview-card{background:#fff;border:1px solid #e2e8f0;border-radius:16px;padding:40px;text-align:center;width:100%;max-width:500px;}
.preview-icon{font-size:4rem;margin-bottom:16px;}
.preview-name{font-size:1.2rem;font-weight:700;color:#0f172a;word-break:break-all;margin-bottom:8px;}
.preview-desc{color:#64748b;font-size:0.9rem;margin-bottom:20px;}
.preview-meta{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:28px;text-align:left;}
.meta-item{padding:10px;background:#f8fafc;border-radius:8px;}
.meta-label{display:block;font-size:0.75rem;color:#94a3b8;margin-bottom:2px;}
.preview-actions{display:flex;flex-direction:column;gap:10px;}
.preview-error{padding:40px;text-align:center;}
.preview-error h2{color:#64748b;margin-bottom:8px;}
.back-link{margin-top:24px;color:#64748b;text-decoration:none;font-size:0.9rem;}
.back-link:hover{color:#2563eb;}

/* 弹窗 */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.4);display:flex;align-items:center;justify-content:center;z-index:100;}
.modal{background:#fff;border-radius:16px;padding:32px;width:90%;max-width:400px;text-align:center;}
.modal h3{margin-bottom:16px;}
.modal input{width:100%;padding:10px 16px;border:1px solid #e2e8f0;border-radius:8px;font-size:1rem;margin-bottom:16px;outline:none;}
.modal input:focus{border-color:#2563eb;}
.modal-actions{display:flex;gap:10px;justify-content:center;}
.pwd-error{color:#ef4444;font-size:0.85rem;margin-top:10px;}

/* 状态 */
.loading,.empty{text-align:center;padding:60px 20px;color:#94a3b8;font-size:0.95rem;}
.footer{text-align:center;padding:40px 0 20px;color:#cbd5e1;font-size:0.8rem;}

/* Toast */
.toast{position:fixed;bottom:80px;left:50%;transform:translateX(-50%) translateY(20px);background:#0f172a;color:#fff;padding:10px 24px;border-radius:8px;font-size:0.9rem;opacity:0;transition:all .3s;z-index:200;}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* 响应式 */
@media(max-width:640px){
    .container{padding:12px;}
    .header{padding:24px 0 16px;}
    .site-title{font-size:1.4rem;}
    .file-card{flex-wrap:wrap;padding:12px;}
    .file-actions{width:100%;justify-content:flex-end;}
    .preview-card{padding:24px;}
    .preview-meta{grid-template-columns:1fr;}
}