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12px;font-size:15px;font-weight:600}.help-list{margin:0;padding:0;list-style:none}.help-list li{color:#475569;margin-bottom:8px;padding-left:20px;font-size:14px;line-height:1.8;position:relative}.help-list li:before{content:"•";color:#024ba1;font-weight:700;position:absolute;left:8px}.help-list li:last-child{margin-bottom:0}.help-list a{color:#024ba1;font-weight:500;text-decoration:none}.help-list a:hover{text-decoration:underline}.error-actions{justify-content:center;gap:12px;display:flex}.btn-back-home,.btn-contact{cursor:pointer;border:none;border-radius:10px;padding:12px 28px;font-size:15px;font-weight:600;transition:all .2s}.btn-back-home{color:#475569;background:#fff;border:1px solid #e2e8f0}.btn-back-home:hover{background:#f8fafc;border-color:#cbd5e1}.btn-contact{color:#fff;background:linear-gradient(135deg,#013a80 0%,#024ba1 52%,#1a6fcf 100%);box-shadow:0 4px 12px #024ba147}.btn-contact:hover{transform:translateY(-2px);box-shadow:0 6px 16px #024ba159}@media (width<=768px){.dataset-upload-form{padding:24px 20px}.form-actions{flex-direction:column}.btn-cancel,.btn-submit{justify-content:center;width:100%}.permission-error{padding:40px 24px}.error-actions{flex-direction:column;width:100%}.btn-back-home,.btn-contact{width:100%}}.competition-dataset-detail{max-width:1600px;margin:0 auto;padding:20px}.competition-header-card{background:#fff;border-radius:8px;margin-bottom:20px;padding:30px;box-shadow:0 1px 3px #0000001a}.header-content{align-items:center;gap:20px;margin-bottom:25px;display:flex}.dataset-icon-large{color:#fff;background:linear-gradient(135deg,#1890ff 0%,#06c 100%);border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:60px;height:60px;font-size:28px;display:flex}.header-info{flex:1}.dataset-title{color:#1a1a1a;margin-bottom:8px;font-size:24px;font-weight:600}.dataset-desc{color:#666;font-size:14px}.btn-favorite{color:#666;cursor:pointer;background:#fff;border:1px solid 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#0f172a0a;--radius-sm:10px;--radius-md:16px;--radius-lg:22px;--ease:cubic-bezier(.4,0,.2,1)}.dashboard-content{width:100%;max-width:1440px}.hero-row{justify-content:space-between;align-items:flex-end;margin-bottom:22px;display:flex}.eyebrow{color:var(--primary-dark);background:var(--primary-light);border-radius:20px;align-items:center;gap:7px;margin-bottom:10px;padding:5px 12px;font-size:11.5px;font-weight:600;display:inline-flex}.hero-row h1{margin:0;font-size:23px;font-weight:700}.hero-row p{color:var(--text-secondary);margin-top:4px;font-size:13px}.upload-btn{background:var(--primary);color:#fff;cursor:pointer;transition:all .2s var(--ease);border:none;border-radius:11px;align-items:center;gap:8px;padding:11px 20px;font-size:13.5px;font-weight:600;display:flex;box-shadow:0 6px 16px #2563eb47}.upload-btn:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 8px 20px #2563eb59}.upload-btn svg{width:15px;height:15px}.upload-btn.secondary{color:var(--primary);border:1.5px solid var(--primary-light);box-shadow:none;background:#fff}.upload-btn.secondary:hover{background:var(--primary-lighter);border-color:var(--primary)}.charts-grid{grid-template-columns:1fr 1fr;gap:16px;margin-bottom:20px;display:grid}.chart-card{background:var(--surface-card);border:1px solid var(--border-soft);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);transition:all .2s var(--ease);padding:20px 22px}.chart-card:hover{box-shadow:var(--shadow-md)}.chart-head{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.chart-head h3{margin:0;font-size:14px;font-weight:700}.chart-head .chip{background:var(--primary-light);color:var(--primary-dark);border-radius:99px;padding:3px 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.lv{margin-left:auto;font-weight:700}.line-chart-wrap{padding-top:4px}.leaderboard{flex-direction:column;gap:9px;margin-top:14px;display:flex}.lb-row{align-items:center;gap:10px;font-size:12.5px;display:flex}.lb-rank{background:var(--surface-tint);width:20px;height:20px;color:var(--text-secondary);border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;font-size:11px;font-weight:700;display:flex}.lb-rank.top{background:var(--accent-warm-light);color:var(--accent-warm)}.lb-name{flex:1;font-weight:600}.lb-pts{color:var(--primary);font-weight:700}.notif-list{flex-direction:column;display:flex}.notif-row{border-bottom:1px solid var(--border-soft);align-items:flex-start;gap:12px;padding:12px 0;display:flex}.notif-row:last-child{border-bottom:none;padding-bottom:0}.notif-icon{border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:30px;height:30px;display:flex}.notif-icon svg{width:14px;height:14px}.notif-title{font-size:12.5px;font-weight:600}.notif-meta{color:var(--text-tertiary);margin-top:2px;font-size:11px}.points-card{background:var(--surface-card);border:1px solid var(--border-soft);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);align-items:center;gap:24px;margin-bottom:30px;padding:22px;display:flex}.points-total .num{color:var(--primary);letter-spacing:-.02em;font-size:30px;font-weight:800}.points-total .lbl{color:var(--text-tertiary);margin-top:2px;font-size:12px}.points-progress{flex:1}.points-progress .top-row{color:var(--text-secondary);justify-content:space-between;margin-bottom:6px;font-size:12px;display:flex}.progress-track{background:var(--surface-tint);border-radius:99px;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--primary), var(--accent-teal));height:100%;transition:width .5s var(--ease);border-radius:99px}.section-title{justify-content:space-between;align-items:center;margin:30px 0 14px;display:flex}.section-title h2{margin:0;font-size:16px;font-weight:700}.section-title .see-all{color:var(--primary);cursor:pointer;transition:color .2s var(--ease);font-size:12.5px;font-weight:600}.section-title .see-all:hover{color:var(--primary-dark)}.table-card{background:var(--surface-card);border:1px solid var(--border-soft);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);overflow:hidden}.table-card table{border-collapse:collapse;width:100%}.table-card thead th{text-align:left;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.03em;border-bottom:1px solid var(--border-soft);background:var(--primary-lighter);padding:12px 18px;font-size:11.5px;font-weight:600}.table-card tbody td{border-bottom:1px solid var(--border-soft);padding:13px 18px;font-size:13px}.table-card tbody tr:last-child td{border-bottom:none}.table-card tbody tr:hover{background:var(--primary-lighter)}.file-cell{align-items:center;gap:10px;display:flex}.file-icon{background:var(--primary-light);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:30px;height:30px;display:flex}.file-icon svg{width:14px;height:14px;color:var(--primary-dark)}.file-name{font-weight:600}.file-meta{color:var(--text-tertiary);font-size:11px}.badge{white-space:nowrap;border-radius:99px;padding:4px 10px;font-size:11px;font-weight:600;display:inline-block}.badge-mint{background:var(--accent-mint-light);color:var(--accent-mint)}.badge-warm{background:var(--accent-warm-light);color:var(--accent-warm)}.badge-blue{background:var(--primary-light);color:var(--primary-dark)}.badge-red{background:var(--accent-red-light);color:var(--accent-red)}@media (width<=1024px){.charts-grid{grid-template-columns:1fr}.points-card{flex-direction:column;align-items:stretch}}@media (width<=768px){.hero-row{flex-direction:column;align-items:flex-start;gap:16px}.upload-btn{justify-content:center;width:100%}.table-card{overflow-x:auto}}:root{--ink:#0f172a;--ink-soft:#334155;--text-secondary:#64748b;--text-tertiary:#94a3b8;--student-primary:#10b981;--student-primary-dark:#059669;--student-primary-light:#d1fae5;--student-primary-lighter:#f0fdf4;--accent-teal:#0ea5e9;--accent-teal-dark:#0369a1;--accent-teal-light:#e6f7ff;--accent-warm:#f59e0b;--accent-warm-light:#fef3c7;--accent-purple:#8b5cf6;--accent-purple-light:#ede9fe;--accent-red:#dc2626;--accent-red-light:#fef2f2;--deep-navy:#0a1628;--deep-navy-soft:#16233a;--surface:#f5f8ff;--surface-card:#fff;--surface-tint:#eff4fe;--border:#e2e8f0;--border-soft:#eaf0fb;--shadow-sm:0 1px 2px #0f172a0a, 0 2px 10px #10b9810a;--shadow-md:0 10px 28px #10b9811f, 0 2px 6px #0f172a0a;--radius-sm:10px;--radius-md:16px;--radius-lg:22px;--ease:cubic-bezier(.4, 0, .2, 1)}.student-layout{min-height:100vh;color:var(--ink);background:var(--surface);-webkit-font-smoothing:antialiased;grid-template-columns:232px 1fr;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,PingFang SC,Inter,Noto Sans SC,sans-serif;font-size:14px;display:grid}.student-sidebar{background:var(--surface-card);border-right:1px solid var(--border-soft);flex-direction:column;gap:20px;height:calc(100vh - 56px);padding:16px 14px;display:flex;position:sticky;top:56px;overflow-y:auto}.brand{align-items:center;gap:10px;padding:2px 8px 10px;display:flex}.brand-mark{background:linear-gradient(135deg, var(--student-primary), var(--accent-teal));border-radius:9px;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;display:flex}.brand-mark svg{width:17px;height:17px}.brand-name{font-size:16.5px;font-weight:700}.brand-sub{color:var(--text-tertiary);margin-top:-1px;font-size:11px}.nav-group-label{color:var(--text-tertiary);letter-spacing:.04em;text-transform:uppercase;margin-bottom:6px;padding:0 12px;font-size:11px;font-weight:600}.nav{flex-direction:column;gap:2px;display:flex}.nav-item{color:var(--ink-soft);cursor:pointer;transition:background .15s var(--ease);border-radius:9px;align-items:center;gap:10px;padding:9px 12px;font-size:13.5px;font-weight:500;display:flex}.nav-item svg{opacity:.7;width:16px;height:16px;stroke:var(--ink-soft);flex-shrink:0}.nav-item:hover{background:var(--student-primary-lighter)}.nav-item.active{background:var(--student-primary-light);color:var(--student-primary-dark);font-weight:600}.nav-item.active svg{opacity:1;stroke:var(--student-primary-dark)}.sidebar-footer{border-radius:var(--radius-md);background:linear-gradient(155deg, var(--student-primary-dark), 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svg{opacity:.6;flex-shrink:0;width:14px;height:14px}.topbar-right{align-items:center;gap:14px;display:flex}.icon-btn{background:var(--surface-tint);cursor:pointer;border:none;border-radius:9px;justify-content:center;align-items:center;width:33px;height:33px;display:flex;position:relative}.icon-btn svg{width:15px;height:15px;color:var(--ink-soft)}.dot-badge{background:var(--accent-warm);width:6px;height:6px;box-shadow:0 0 0 2px var(--surface-card);border-radius:99px;position:absolute;top:6px;right:7px}.avatar{background:linear-gradient(135deg, var(--student-primary), var(--accent-teal));color:#fff;cursor:pointer;border-radius:99px;justify-content:center;align-items:center;width:33px;height:33px;font-size:12.5px;font-weight:600;display:flex}.student-content{flex:1;width:100%;padding:28px 32px 28px 0}.student-courses-container{width:100%;max-width:1440px;padding-left:2rem}.courses-header{justify-content:space-between;align-items:flex-end;margin-bottom:22px;display:flex}.courses-header 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