.container { 
    max-width: 1000px; 
    margin: 0 auto; 
    background: #fff; 
    border-radius: 12px; 
    padding: 30px 40px; 
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e2e8f0;
}
.title {
    color: #1e293b; 
    margin: 0 0 10px 0;
    font-size: 32px;
    font-weight: 700;
}
.subtitle {
    color: #64748b;
    font-size: 16px;
    margin: 0;
    font-weight: 400;
}
.version-badge {
    display: inline-block;
    padding: 4px 12px;
    background: #3b82f6;
    color: white;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-left: 10px;
    vertical-align: middle;
}
.form-section {
    margin-bottom: 40px;
    padding: 25px;
    background: #f8fafc;
    border-radius: 10px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}
.form-section:hover {
    border-color: #cbd5e1;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.section-title {
    color: #1e293b;
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 15px 0;
    display: flex;
    align-items: center;
}
.section-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: #3b82f6;
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 600;
    margin-right: 12px;
}
label {
    display: block;
    margin-bottom: 8px;
    color: #475569;
    font-weight: 500;
    font-size: 15px;
}
.file-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    background: white;
    color: #475569;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 15px;
}
.file-input:hover {
    border-color: #94a3b8;
    background: #f8fafc;
}
.file-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}
.hint {
    font-size: 13px;
    color: #64748b;
    margin-top: 8px;
    line-height: 1.5;
}
.sample-table {
    border-collapse: collapse;
    width: 100%;
    margin: 15px 0;
    font-size: 13px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.sample-table th {
    background: #1e293b;
    color: white;
    font-weight: 600;
    padding: 10px 12px;
    text-align: left;
}
.sample-table td {
    padding: 10px 12px;
    border-bottom: 1px solid #e2e8f0;
    background: white;
}
.sample-table tr:last-child td {
    border-bottom: none;
}
.sample-table tr:hover td {
    background: #f8fafc;
}
code {
    display: inline-block;
    padding: 6px 10px;
    background: #f1f5f9;
    border-radius: 6px;
    font-size: 13px;
    font-family: 'Monaco', 'Menlo', monospace;
    color: #1e293b;
    border: 1px solid #e2e8f0;
    margin: 5px 0;
}
.requirements {
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 8px;
    padding: 15px 20px;
    margin-top: 20px;
}
.requirements h4 {
    color: #0369a1;
    margin: 0 0 10px 0;
    font-size: 14px;
    display: flex;
    align-items: center;
}
.requirements ul {
    margin: 0;
    padding-left: 20px;
    color: #475569;
}
.requirements li {
    margin-bottom: 6px;
    font-size: 13px;
}
.submit-btn {
    display: block;
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
    text-align: center;
}
.submit-btn:hover {
    background: linear-gradient(135deg, #2563eb, #1e40af);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.3);
}
.submit-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(59, 130, 246, 0.3);
}
.submit-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}
.icon {
    margin-right: 8px;
    font-size: 18px;
}
.info-box {
    background: #fef3c7;
    border: 1px solid #fbbf24;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 30px;
    color: #92400e;
}
.info-box strong {
    color: #92400e;
}
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
}
.legend-item {
    display: flex;
    align-items: center;
    font-size: 13px;
    color: #475569;
}
.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    margin-right: 8px;
}
.legend-color.late { background: #fee2e2; }
.legend-color.ontime { background: #dcfce7; }
.legend-color.absent { background: #fef3c7; }
.legend-color.not-in-schedule { background: #f3e8ff; }
.legend-color.error { background: #fecaca; }