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var(--border-light)}.mapping-preview-empty{padding:24px;text-align:center;font-size:13px;color:var(--text-secondary)}.mapping-error{margin-top:12px;padding:10px 12px;background:var(--danger-light);color:var(--danger);border-radius:var(--radius);font-size:13px}.no-student-hint{font-size:13px;color:var(--text-light);padding:12px}.validation-expand-icon{margin-left:auto;color:var(--text-secondary)}.validation-detail{margin-top:16px;padding-top:16px;border-top:1px solid rgba(0,0,0,.1)}.distribution-section{margin-bottom:20px}.distribution-section h5{font-size:14px;font-weight:600;margin-bottom:12px;color:var(--text)}.distribution-chart{display:flex;gap:24px}.dist-group{flex:1;background:#fff;border-radius:var(--radius);padding:12px}.dist-title{font-size:13px;font-weight:600;text-align:center;margin-bottom:10px;color:var(--text-secondary)}.dist-bars{display:flex;align-items:flex-end;justify-content:center;gap:8px;height:80px;padding-top:10px}.dist-bar-item{display:flex;flex-direction:column;align-items:center;gap:4px;flex:1;max-width:40px}.dist-bar{width:100%;min-height:4px;border-radius:4px 4px 0 0;display:flex;align-items:flex-start;justify-content:center;padding-top:2px;transition:height .3s ease}.dist-bar.male{background:linear-gradient(180deg,#60a5fa,#3b82f6)}.dist-bar.female{background:linear-gradient(180deg,#f472b6,#ec4899)}.dist-bar-num{font-size:10px;font-weight:600;color:#fff}.dist-bar-label{font-size:11px;color:var(--text-secondary);white-space:nowrap}.validation-items{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}.v-item{display:flex;align-items:center;gap:10px;padding:10px 14px;background:#fff;border-radius:var(--radius);font-size:13px}.v-item.pass .v-icon{color:var(--success)}.v-item.fail .v-icon{color:var(--danger)}.v-icon{font-weight:700;font-size:14px;width:20px;text-align:center}.v-label{flex:1;color:var(--text)}.v-status{font-weight:500;color:var(--text-secondary)}.v-item.pass .v-status{color:var(--success)}.v-item.fail .v-status{color:var(--danger)}.fix-btn{width:100%;justify-content:center;border-color:var(--warning);color:var(--warning)}.fix-btn:hover{background:var(--warning);color:#fff;border-color:var(--warning)}@media (max-width: 768px){.app-header{padding:24px 16px 40px}.app-main{padding:0 16px 32px}.step-nav-wrapper{padding:16px}.step-label{font-size:11px}.step-line{margin:0 -10px 24px}.file-upload-section,.config-content{padding:20px}.form-grid{grid-template-columns:1fr}.stat-cards{grid-template-columns:repeat(2,1fr)}.stat-card.file{grid-column:span 2}.validation-stats{grid-template-columns:repeat(2,1fr)}.preview-header{flex-direction:column;gap:12px;align-items:stretch}.preview-actions{flex-wrap:wrap}.preview-actions .btn-primary{width:100%;margin-left:0;order:-1;justify-content:center}.export-card{padding:32px 20px}}@media (max-width: 480px){.step-label{display:none}.step-line{margin:0 -8px}}