:root{--bg: #f4f6fa;--panel: #ffffff;--border: #e3e8ef;--text: #1c2430;--muted: #6b7686;--primary: #1f6feb;--primary-dark: #1a5dc4;--accent: #0f9d58;--warn: #f2990a;--danger: #e5484d;--radius: 10px;--shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 1px 2px rgba(16, 24, 40, .04);--gantt-weekend: #f2f5fa;--gantt-grid: #edf1f7}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,Arial,sans-serif;background:var(--bg);color:var(--text);font-size:14px}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.layout{display:flex;min-height:100vh}.sidebar{width:230px;background:#111a2e;color:#c9d2e3;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:10px;padding:18px 18px 14px;color:#fff;font-weight:700;font-size:15px;letter-spacing:.2px;border-bottom:1px solid rgba(255,255,255,.08)}.brand-logo{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--primary),#7aa5ff);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;color:#fff}.nav{flex:1;padding:12px 10px;overflow-y:auto}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;margin-bottom:2px;border-radius:8px;color:#c9d2e3;text-decoration:none;font-weight:500}.nav-item:hover{background:#ffffff0f;color:#fff;text-decoration:none}.nav-item.active{background:var(--primary);color:#fff}.nav-icon{width:18px;text-align:center;font-size:15px}.sidebar-footer{padding:14px 16px;border-top:1px solid rgba(255,255,255,.08);font-size:12px;color:#93a1bd}.sidebar-footer b{color:#fff;display:block}.sidebar-role{display:inline-block;margin-top:6px;background:#ffffff1a;padding:2px 8px;border-radius:20px;font-size:11px}.main{flex:1;padding:22px 26px;max-width:1300px}.page-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px;flex-wrap:wrap}.page-title{font-size:20px;font-weight:700;margin:0}.page-sub{color:var(--muted);font-size:13px;margin-top:4px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:16px}.panel-title{font-size:15px;font-weight:600;margin:0 0 12px}.grid{display:grid;gap:14px}.grid-2{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.grid-4{grid-template-columns:repeat(auto-fill,minmax(210px,1fr))}.stat-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 16px}.stat-value{font-size:26px;font-weight:800;line-height:1.1}.stat-label{color:var(--muted);font-size:12px;margin-top:4px}.stat-accent{color:var(--danger)}table{width:100%;border-collapse:collapse}th{text-align:left;font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);padding:8px 10px;border-bottom:1px solid var(--border);white-space:nowrap}td{padding:9px 10px;border-bottom:1px solid var(--border);vertical-align:middle}tr:last-child td{border-bottom:none}tr.row-click:hover td{background:#f7f9fc;cursor:pointer}.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);background:var(--panel);color:var(--text);padding:7px 14px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;transition:.15s;text-decoration:none}.btn:hover{background:#f1f4f9;text-decoration:none}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-danger{background:#fff;border-color:#f2c4c5;color:var(--danger)}.btn-danger:hover{background:#fdf0f0}.btn-sm{padding:4px 10px;font-size:12px}.btn-icon{padding:4px 8px;font-size:12px}.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:600;white-space:nowrap}.b-green{background:#e6f4ea;color:#1a7f37}.b-blue{background:#e8f0fe;color:#1f6feb}.b-orange{background:#fef3e2;color:#b06e00}.b-red{background:#fdecec;color:#c62828}.b-gray{background:#eef1f5;color:#55606f}.b-purple{background:#f0ecfb;color:#6b46c1}.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}.field{display:flex;flex-direction:column;gap:5px;margin-bottom:12px}.field label{font-size:12px;font-weight:600;color:var(--muted)}.field input,.field select,.field textarea{border:1px solid var(--border);border-radius:8px;padding:8px 11px;font-size:13px;font-family:inherit;background:#fff;color:var(--text)}.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #1f6feb1f}.field textarea{min-height:76px;resize:vertical}.form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:8px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;z-index:100;overflow-y:auto}.modal{background:#fff;border-radius:12px;width:100%;max-width:560px;box-shadow:0 20px 50px #00000040;padding:20px}.modal-title{font-size:16px;font-weight:700;margin:0 0 14px}.error-banner{background:#fdecec;color:#c62828;border:1px solid #f2c4c5;padding:10px 14px;border-radius:8px;margin-bottom:12px;font-size:13px}.success-banner{background:#e6f4ea;color:#1a7f37;border:1px solid #b7dfc2;padding:10px 14px;border-radius:8px;margin-bottom:12px;font-size:13px}.empty{color:var(--muted);text-align:center;padding:30px 10px;font-size:13px}.muted{color:var(--muted)}.mono{font-family:Consolas,monospace;font-size:12px}.flex{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.flex-between{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.grow{flex:1}.mt{margin-top:14px}.mb{margin-bottom:14px}.loading-screen{display:flex;align-items:center;justify-content:center;height:100vh;color:var(--muted)}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#111a2e,#1f3a6b)}.login-card{background:#fff;width:380px;border-radius:14px;box-shadow:0 24px 60px #00000059;padding:28px}.login-logo{font-size:22px;font-weight:800;margin-bottom:4px}.login-sub{color:var(--muted);font-size:13px;margin-bottom:20px}.demo-box{background:#f4f6fa;border:1px dashed var(--border);border-radius:8px;padding:10px 12px;font-size:12px;color:var(--muted);margin-bottom:16px}.demo-box div{margin:2px 0}.tree{display:flex;flex-direction:column;gap:2px}.tree-node{border-radius:8px;padding:6px 10px;cursor:pointer;display:flex;align-items:center;gap:8px}.tree-node:hover{background:#f1f4f9}.tree-node.folder{font-weight:600}.tree-node.active{background:#e8f0fe;color:var(--primary-dark)}.tree-arrow{width:14px;color:var(--muted);font-size:11px}.tree-children{margin-left:18px;border-left:1px dashed var(--border);padding-left:6px}.viewer{border:1px solid var(--border);border-radius:var(--radius);background:#262b33;min-height:420px;overflow:hidden}.viewer-frame{width:100%;height:540px;border:none;display:block;background:#fff}.viewer-img{width:100%;display:block}.side-col{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:14px}.tab{padding:8px 14px;border:none;background:none;font-size:13px;font-weight:600;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent}.tab:hover{color:var(--text)}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.progress{background:#eef1f5;border-radius:20px;height:8px;overflow:hidden;min-width:120px}.progress>div{background:var(--accent);height:100%}.mt-2{margin-top:8px}.bim-wrap{display:flex;flex-direction:column;gap:14px}.bim-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}.bim-canvas{position:relative;width:100%;height:58vh;min-height:380px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#f5f7fa}.bim-canvas canvas{display:block;touch-action:none}.chip{border:1px solid var(--border);border-radius:20px}.chip-on{border-color:var(--primary);color:var(--primary-dark)}.chip-off{opacity:.55;text-decoration:line-through}.totals-row td{font-weight:700;background:#f0f4fa}.link-btn{border:none;background:none;color:var(--primary-dark);cursor:pointer;text-decoration:underline;font-size:13px;padding:0}.bim-status{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:#f5f7fa;color:var(--muted);z-index:2}.spinner{width:34px;height:34px;border-radius:50%;border:3px solid var(--border);border-top-color:var(--primary);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.stat-danger{color:var(--danger)}.gantt-scroll{overflow:auto;max-height:68vh}.gantt-scroll .gantt-row{display:flex;border-bottom:1px solid var(--border)}.gantt-scroll .gantt-row:last-child{border-bottom:none}.gantt-name-col{width:300px;min-width:300px;flex-shrink:0;padding:8px 12px;background:var(--panel);position:sticky;left:0;z-index:2;border-right:1px solid var(--border)}.gantt-name-line{display:flex;align-items:center;justify-content:space-between;gap:8px}.gantt-name-line b{font-size:13px;line-height:1.3}.gantt-meta{font-size:11px;margin-top:2px}.gantt-header{position:sticky;top:0;z-index:3;background:var(--panel);font-weight:700}.gantt-header .gantt-name-col{font-size:12px}.gantt-timeline{position:relative;height:52px}.gantt-header .gantt-timeline{height:42px}.gantt-month{position:absolute;top:0;height:22px;font-size:11px;font-weight:700;color:var(--muted);padding-left:6px;display:flex;align-items:center;white-space:nowrap;overflow:hidden}.gantt-day{position:absolute;top:22px;height:20px;font-size:9px;color:var(--muted);display:flex;align-items:center;justify-content:center;border-left:1px solid var(--gantt-grid)}.gantt-day.weekend{color:#b8c2d0}.gantt-bar{position:absolute;top:16px;height:20px;border-radius:6px;overflow:hidden;cursor:pointer;color:#fff}.gantt-bar:hover{opacity:.85}.gantt-bar.overdue{outline:2px solid var(--danger)}.gantt-progress{position:absolute;left:0;top:0;bottom:0;background:#ffffff47}.gantt-bar-label{position:absolute;left:6px;top:0;bottom:0;display:flex;align-items:center;font-size:10px;font-weight:700;text-shadow:0 1px 2px rgba(0,0,0,.25);white-space:nowrap}.gantt-today{position:absolute;top:0;bottom:0;width:0;border-left:2px solid var(--danger);z-index:1;pointer-events:none}