* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 40px 20px;
}

.login-box, .survey-box, .thankyou-box {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    padding: 40px;
    max-width: 600px;
    width: 100%;
}

.survey-box {
    max-width: 800px;
}

/* Logo Section */
.logo-section {
    text-align: center;
    margin-bottom: 30px;
}

.logo {
    max-width: 200px;
    height: auto;
}

/* Header */
.header-section {
    margin-bottom: 25px;
}

.header-section h1 {
    color: #2d3748;
    font-size: 24px;
    margin-bottom: 15px;
    text-align: center;
}

.research-info {
    background: #f7fafc;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.research-info h2 {
    color: #1a202c;
    font-size: 18px;
    margin-bottom: 10px;
    font-weight: 600;
}

.researcher {
    color: #718096;
    font-size: 14px;
    margin-top: 8px;
}

/* Description */
.description {
    background: #edf2f7;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 25px;
}

.description p {
    color: #4a5568;
    font-size: 14px;
    margin-bottom: 10px;
}

.description p:last-child {
    margin-bottom: 0;
}

/* Verification Section */
.verification-section {
    background: #fffbeb;
    border: 2px solid #fbbf24;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 25px;
}

.verification-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.lock-icon {
    font-size: 24px;
}

.verification-header h3 {
    color: #92400e;
    font-size: 16px;
    margin: 0;
}

.verification-text {
    color: #78350f;
    font-size: 14px;
}

/* Verified Badge */
.verified-badge {
    background: #d1fae5;
    color: #065f46;
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    margin-bottom: 25px;
    border: 2px solid #10b981;
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    color: #2d3748;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.required {
    color: #e53e3e;
}

.optional {
    color: #718096;
    font-weight: 400;
    font-size: 13px;
}

input[type="email"],
input[type="password"],
input[type="text"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 6px;
    font-size: 15px;
    transition: all 0.3s;
    font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

input::placeholder,
textarea::placeholder {
    color: #a0aec0;
}

/* Radio and Checkbox Groups */
.radio-group,
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.radio-group label,
.checkbox-group label {
    display: flex;
    align-items: center;
    font-weight: 400;
    cursor: pointer;
    padding: 10px;
    border-radius: 6px;
    transition: background 0.2s;
}

.radio-group label:hover,
.checkbox-group label:hover {
    background: #f7fafc;
}

.radio-group input[type="radio"],
.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 10px;
    cursor: pointer;
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 14px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-large {
    padding: 16px;
    font-size: 18px;
    margin-top: 30px;
}

/* Privacy Note */
.privacy-note {
    background: #f0fdf4;
    border-left: 4px solid #10b981;
    padding: 15px;
    margin: 25px 0;
    border-radius: 4px;
}

.privacy-note p {
    color: #065f46;
    font-size: 13px;
    margin: 0;
}

/* Error Message */
.error-message {
    background: #fee;
    border: 2px solid #fc8181;
    color: #c53030;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
}

/* Survey Sections */
.section {
    background: #f7fafc;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 25px;
    border-left: 4px solid #667eea;
}

.section h2 {
    color: #2d3748;
    font-size: 18px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
}

/* Thank You Page */
.thankyou-box {
    text-align: center;
}

.success-icon {
    font-size: 72px;
    margin-bottom: 20px;
}

.thankyou-box h1 {
    color: #2d3748;
    font-size: 32px;
    margin-bottom: 20px;
}

.thankyou-message {
    color: #4a5568;
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 30px;
}

.info-box {
    background: #edf2f7;
    padding: 20px;
    border-radius: 8px;
    margin: 30px 0;
    text-align: left;
}

.info-box h3 {
    color: #2d3748;
    font-size: 16px;
    margin-bottom: 10px;
}

.info-box p {
    color: #4a5568;
    font-size: 14px;
    margin: 0;
}

.appreciation {
    background: #d1fae5;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
}

.appreciation p {
    color: #065f46;
    font-size: 16px;
    font-weight: 600;
    margin: 0;
}

/* Footer */
.footer,
.footer-note {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
}

.footer p,
.footer-note p {
    color: #718096;
    font-size: 13px;
    margin: 5px 0;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 20px 10px;
    }
    
    .login-box,
    .survey-box,
    .thankyou-box {
        padding: 25px 20px;
    }
    
    .header-section h1 {
        font-size: 20px;
    }
    
    .research-info h2 {
        font-size: 16px;
    }
    
    .section {
        padding: 20px 15px;
    }
}