:root{--bg:#f4f6f9;--surface:#fff;--border:#e2e8f0;--text:#1e293b;--text-muted:#64748b;--primary:#2563eb;--primary-hover:#1d4ed8;--danger:#dc2626;--success:#16a34a;--shadow:0 1px 3px rgba(0,0,0,.08);--radius:10px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}a{color:var(--primary);text-decoration:none}button,input,textarea{font:inherit}.container{max-width:960px;margin:0 auto;padding:24px 20px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border:none;border-radius:8px;cursor:pointer;font-weight:500;transition:background .15s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-secondary{background:#f1f5f9;color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:#e2e8f0}.btn-danger{background:#fef2f2;color:var(--danger);border:1px solid #fecaca}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:6px;font-weight:500;font-size:14px}.form-group input,.form-group textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:#fff}.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}.error{color:var(--danger);font-size:14px;margin-top:8px}.header{background:var(--surface);border-bottom:1px solid var(--border);padding:16px 0}.header-inner{max-width:960px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between}.header h1{font-size:18px;font-weight:600}.header-right{display:flex;align-items:center;gap:12px;font-size:14px;color:var(--text-muted)}.doc-list{display:flex;flex-direction:column;gap:12px}.doc-item{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}.doc-info h3{font-size:16px;margin-bottom:4px}.doc-meta{font-size:13px;color:var(--text-muted)}.doc-actions{display:flex;gap:8px;flex-shrink:0;flex-wrap:wrap;justify-content:flex-end}.empty{text-align:center;padding:48px 20px;color:var(--text-muted)}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:500;background:#dbeafe;color:#1d4ed8}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.login-card{width:100%;max-width:400px}.login-card h1{font-size:24px;margin-bottom:8px}.login-card p{color:var(--text-muted);margin-bottom:24px;font-size:14px}.upload-area{border:2px dashed var(--border);border-radius:var(--radius);padding:32px;text-align:center;color:var(--text-muted);cursor:pointer;transition:border-color .15s}.upload-area.dragover,.upload-area:hover{border-color:var(--primary);background:#f8fafc}.upload-area input{display:none}.tabs{display:flex;gap:8px;margin-bottom:20px}.tab{padding:8px 16px;border-radius:8px;font-size:14px;color:var(--text-muted);background:transparent;border:1px solid transparent;cursor:pointer}.tab.active{background:#eff6ff;color:var(--primary);border-color:#bfdbfe}.preview-page{min-height:100vh;display:flex;flex-direction:column}.preview-toolbar{background:var(--surface);border-bottom:1px solid var(--border);padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-shrink:0}.preview-toolbar h2{font-size:16px;font-weight:600}.preview-toolbar-actions{display:flex;gap:8px;flex-shrink:0}.preview-frame-wrap{flex:1 1;min-height:0;background:#525659;padding:0}.preview-frame{width:100%;height:calc(100vh - 57px);border:none;display:block;background:#525659}.preview-modal-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.55);display:flex;align-items:center;justify-content:center;padding:24px;z-index:1000}.preview-modal{width:min(1100px,100%);height:min(85vh,900px);background:var(--surface);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,.25)}.preview-modal-header{padding:14px 18px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:12px}.preview-modal-header h3{font-size:15px;font-weight:600}.preview-modal-frame{flex:1 1;border:none;width:100%;background:#525659}@media (max-width:640px){.doc-item{flex-direction:column;align-items:stretch}.doc-actions{justify-content:stretch}.doc-actions .btn{flex:1 1}.task-detail-body{grid-template-columns:1fr}.task-pdf-frame{height:50vh}}.version-badge{display:inline-block;margin-left:8px;padding:2px 8px;border-radius:999px;font-size:11px;font-weight:600;background:#f1f5f9;color:var(--text-muted);vertical-align:middle}.upload-notice{background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;padding:12px 14px;font-size:14px;margin-bottom:20px;color:#1e40af}.field-hint{margin-top:6px;font-size:13px;color:var(--text-muted)}.field-hint code{background:#f1f5f9;padding:2px 6px;border-radius:4px;font-size:12px}.success-msg{color:var(--success);font-size:14px;margin-bottom:8px}.task-detail{min-height:calc(100vh - 57px);display:flex;flex-direction:column}.task-detail-toolbar{background:var(--surface);border-bottom:1px solid var(--border);padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.task-detail-toolbar h2{font-size:18px;font-weight:600}.task-detail-body{flex:1 1;display:grid;grid-template-columns:1fr 380px;grid-gap:0;gap:0;min-height:0}.task-pdf-panel{background:#525659;min-height:0}.task-pdf-frame{width:100%;height:calc(100vh - 120px);border:none;display:block}.comment-board{border-radius:0;border-top:none;border-right:none;border-bottom:none;display:flex;flex-direction:column;max-height:calc(100vh - 120px);overflow:hidden;padding:0}.comment-board-header{padding:16px 18px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.comment-board-header h3{font-size:15px}.comment-count{font-size:13px;color:var(--text-muted)}.comment-list{list-style:none;flex:1 1;overflow-y:auto;padding:12px 18px}.comment-item{padding:12px 0;border-bottom:1px solid var(--border)}.comment-item:last-child{border-bottom:none}.comment-meta{display:flex;justify-content:space-between;gap:8px;font-size:13px;margin-bottom:6px}.comment-meta span{color:var(--text-muted);flex-shrink:0}.comment-body{font-size:14px;white-space:pre-wrap;word-break:break-word}.mention-tag{color:var(--primary);font-weight:500;background:#eff6ff;padding:1px 4px;border-radius:4px}.comment-empty,.comment-loading{padding:24px 18px;color:var(--text-muted);font-size:14px}.comment-form{padding:14px 18px;border-top:1px solid var(--border)}.mention-textarea-wrap{position:relative;margin-bottom:10px}.mention-textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;resize:vertical;min-height:80px}.mention-hint{font-size:12px;color:var(--text-muted);margin-top:4px}.mention-suggestions{position:absolute;left:0;right:0;bottom:100%;margin-bottom:4px;background:var(--surface);border:1px solid var(--border);border-radius:8px;box-shadow:var(--shadow);list-style:none;max-height:160px;overflow-y:auto;z-index:10}.mention-suggestions button{width:100%;text-align:left;padding:10px 12px;border:none;background:transparent;cursor:pointer}.mention-suggestions button:hover{background:#f8fafc}.notification-btn,.notification-wrap{position:relative}.notification-badge{display:inline-flex;align-items:center;justify-content:center;min-width:18px;height:18px;padding:0 5px;margin-left:6px;border-radius:999px;background:var(--danger);color:#fff;font-size:11px;font-weight:600}.notification-panel{position:absolute;right:0;top:calc(100% + 8px);width:320px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 10px 40px rgba(0,0,0,.12);z-index:100}.notification-panel-header{display:flex;justify-content:space-between;align-items:center;padding:12px 14px;border-bottom:1px solid var(--border);font-size:14px}.link-btn{border:none;background:none;color:var(--primary);cursor:pointer;font-size:13px}.notification-list{list-style:none;max-height:320px;overflow-y:auto}.notification-list li{border-bottom:1px solid var(--border)}.notification-list li a{display:block;padding:12px 14px;color:var(--text);font-size:13px}.notification-list li.unread a{background:#eff6ff}.notification-time{display:block;padding:0 14px 10px;font-size:12px;color:var(--text-muted)}.notification-empty{padding:20px 14px;color:var(--text-muted);font-size:13px}.task-toolbar{display:flex;flex-direction:column;gap:12px;margin-bottom:20px}.search-input{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:8px;font-size:15px}.search-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}.status-filters{display:flex;gap:8px;flex-wrap:wrap}.filter-btn{padding:8px 14px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text-muted);cursor:pointer;font-size:14px}.filter-btn.active{background:#eff6ff;color:var(--primary);border-color:#bfdbfe}.archived-badge{display:inline-block;margin-left:8px;padding:2px 8px;border-radius:999px;font-size:11px;font-weight:600;background:#fef3c7;color:#92400e;vertical-align:middle}.doc-item.archived{opacity:.92;background:#fafafa}.doc-item.has-new-messages{border-color:#93c5fd;box-shadow:0 0 0 1px #dbeafe}.new-msg-badge{display:inline-block;margin-left:8px;padding:2px 8px;border-radius:999px;font-size:11px;font-weight:600;background:#fee2e2;color:#b91c1c;vertical-align:middle}.task-upload-bar{display:none}