/* UCL Authentication Modal Styles */
.auth-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.auth-overlay.hidden {
    display: none;
}

.auth-modal {
    background: white;
    border-radius: 20px;
    padding: 48px 40px;
    max-width: 440px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s ease;
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
}

.auth-modal h2 {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 28px;
    font-weight: 700;
    color: #1d1d1f;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.auth-modal p {
    color: #86868b;
    font-size: 15px;
    line-height: 1.5;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.auth-input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.auth-input-group label {
    font-size: 14px;
    font-weight: 600;
    color: #1d1d1f;
}

.auth-input {
    padding: 14px 16px;
    border: 2px solid rgba(0, 0, 0, 0.06);
    border-radius: 12px;
    font-size: 16px;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    transition: all 0.2s ease;
    background: #fafafa;
}

.auth-input:focus {
    outline: none;
    border-color: #0071e3;
    background: white;
}

.auth-input.error {
    border-color: #ff3b30;
}

.auth-error {
    color: #ff3b30;
    font-size: 13px;
    margin-top: 4px;
    display: none;
}

.auth-error.show {
    display: block;
}

.auth-submit {
    padding: 16px 32px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 8px;
}

.auth-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.auth-submit:active {
    transform: translateY(0);
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 13px;
    color: #86868b;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { 
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Responsiveness */
@media (max-width: 600px) {
    .auth-modal {
        padding: 32px 24px;
        width: 95%;
    }
    
    .auth-modal h2 {
        font-size: 24px;
    }
    
    .auth-icon {
        width: 56px;
        height: 56px;
        font-size: 28px;
    }
}