/* Section & Container */
.test-registration-section {
    padding: 140px 0 100px; /* Space for the transparent header */
    background: var(--bg);
    min-height: 100vh;
}

/* Error Box Styling */
.alert-box {
    max-width: 800px;
    margin: 0 auto 2rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-sm);
    display: flex;
    padding: 1rem;
    gap: 1rem;
    color: #ef4444;
}

.alert-icon { font-size: 1.2rem; margin-top: 2px; }
.alert-list { list-style: none; font-size: 0.9rem; }

/* Main Card */
.form-card {
    max-width: 850px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 3rem;
    box-shadow: var(--shadow);
}

/* Grid System */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* Inputs & Labels */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.input-group input, 
.input-group select {
    padding: 0.8rem 1rem;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus, 
.input-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* Radio Button Styling */
.selection-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    margin-bottom: 3rem;
}

.section-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary);
}

.radio-group {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.radio-item input {
    display: none; /* Hide real radio */
}

.radio-button {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: var(--muted);
}

.radio-item input:checked + .radio-button {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Submit Area */
.form-footer {
    text-align: center;
}

.btn-submit {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.75rem 1.75rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.btn-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.3);
    filter: brightness(1.1);
}

.form-note {
    margin-top: 1.5rem;
    font-size: 0.8rem;
    color: var(--muted);
}

/* Responsive */
@media (max-width: 768px) {
    .form-card { padding: 1.5rem; }
    .form-grid, .selection-grid { grid-template-columns: 1fr; }
    .test-registration-section { padding-top: 100px; }
    .btn-submit { width: 100%; justify-content: center; }
}