body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e9ecef 100%);
    min-height: 100vh;
    padding: 20px 0;
}

.container {
    max-width: 1200px;
}

section {
    margin-bottom: 40px;
    border: none;
    padding: 35px;
    border-radius: 16px;
    background: white;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

section:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

#submission-options {
    display: none;
}

.option {
    display: none;
    position: relative;
}

.option::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 60px;
    bottom: 60px;
    width: 6px;
    background: #d1d5db;
    transform: translateX(-50%);
    z-index: 0;
}

.option section {
    position: relative;
    z-index: 1;
}

.option-card {
    background: linear-gradient(145deg, #ffffff 0%, #f8f9fa 100%);
    border: 2px solid #e0e6ed;
    border-radius: 20px;
    padding: 35px 25px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.option-card::before {
    display: none;
}

.option-card:hover {
    border-color: #0066cc;
    box-shadow: 0 8px 24px rgba(0, 102, 204, 0.2);
    transform: translateY(-4px);
}

.option-card:hover::before {
    transform: scaleX(1);
}

.option-card.selected {
    border-color: #0066cc;
    background: linear-gradient(145deg, #f0f7ff 0%, #e6f2ff 100%);
    box-shadow: 0 8px 24px rgba(0, 102, 204, 0.25);
}

.option-card.selected::before {
    transform: scaleX(1);
}

.option-icon {
    color: #0066cc;
    margin-bottom: 20px;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: linear-gradient(145deg, #f0f7ff, #e6f2ff);
    padding: 12px;
    transition: all 0.3s ease;
    font-size: 32px;
}

.option-icon i {
    color: #0066cc;
}

.option-card:hover .option-icon {
    transform: scale(1.1);
    background: linear-gradient(145deg, #e6f2ff, #cce5ff);
}

.option-icon img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.option-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: #1a1a1a;
    line-height: 1.4;
}

.option-card p {
    font-size: 0.9rem;
    color: #5a6c7d;
    margin: 0;
    line-height: 1.6;
}

h1 {
    margin-bottom: 40px;
    margin-top: 40px;
    font-size: 2.2rem;
    font-weight: 700;
    color: #1a1a1a;
    background: linear-gradient(135deg, #0066cc 0%, #0099ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 1.35rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #e9ecef;
}

.btn-primary {
    background: linear-gradient(135deg, #0066cc 0%, #0099ff 100%);
    border: none;
    border-radius: 10px;
    padding: 12px 28px;
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0052a3 0%, #0077cc 100%);
    box-shadow: 0 6px 16px rgba(0, 102, 204, 0.3);
    transform: translateY(-2px);
}

.btn-outline-primary {
    border: 2px solid #0066cc;
    color: #0066cc;
    border-radius: 10px;
    padding: 8px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background: #0066cc;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.2);
}

.table {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.table td {
    padding: 14px;
    vertical-align: middle;
    border-color: #f0f2f5;
}

.alert {
    border-radius: 12px;
    border: none;
    padding: 16px 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.alert-warning {
    background: linear-gradient(145deg, #fff3cd 0%, #ffe69c 100%);
    color: #856404;
    border-left: 4px solid #ffc107;
}

.alert-info {
    background: linear-gradient(145deg, #d1ecf1 0%, #b8e2ea 100%);
    color: #0c5460;
    border-left: 4px solid #17a2b8;
}

.alert-success {
    background: linear-gradient(145deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    border-left: 4px solid #28a745;
}

form label {
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 8px;
    display: block;
}

input[type="file"],
input[type="url"],
input[type="text"],
.form-control {
    border: 2px solid #e0e6ed;
    border-radius: 10px;
    padding: 10px 16px;
    transition: all 0.3s ease;
}

input[type="file"]:focus,
input[type="url"]:focus,
input[type="text"]:focus,
.form-control:focus {
    border-color: #0066cc;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
    outline: none;
}

#invalid-code {
    background: linear-gradient(145deg, #f8d7da 0%, #f5c2c7 100%);
    color: #721c24;
    padding: 16px 20px;
    border-radius: 12px;
    border-left: 4px solid #dc3545;
    margin-bottom: 30px;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(220, 53, 69, 0.1);
}