* {
    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;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.signup-container {
    width: 100%;
    max-width: 500px;
}

.signup-box {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
    font-size: 28px;
    color: #1a202c;
    margin-bottom: 8px;
    text-align: center;
}

.subtitle {
    color: #718096;
    text-align: center;
    margin-bottom: 32px;
    font-size: 14px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    color: #2d3748;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: #667eea;
}

.password-strength {
    margin-top: 8px;
    height: 4px;
    background: #e2e8f0;
    border-radius: 2px;
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    width: 0%;
    transition: width 0.3s, background 0.3s;
    border-radius: 2px;
}

.strength-bar.weak {
    width: 33%;
    background: #fc8181;
}

.strength-bar.medium {
    width: 66%;
    background: #f6ad55;
}

.strength-bar.strong {
    width: 100%;
    background: #68d391;
}

.checkbox-group {
    margin-bottom: 24px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    color: #4a5568;
    font-size: 14px;
    font-weight: normal;
}

.checkbox-label input {
    margin-right: 8px;
    margin-top: 2px;
    cursor: pointer;
    flex-shrink: 0;
}

.checkbox-label a {
    color: #667eea;
    text-decoration: none;
}

.checkbox-label a:hover {
    text-decoration: underline;
}

.signup-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.signup-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.4);
}

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

.error-message {
    margin-top: 16px;
    padding: 12px;
    background: #fed7d7;
    color: #c53030;
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
}

.success-message {
    margin-top: 16px;
    padding: 12px;
    background: #c6f6d5;
    color: #22543d;
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
}

.divider {
    display: flex;
    align-items: center;
    margin: 32px 0;
    color: #a0aec0;
    font-size: 14px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: #e2e8f0;
}

.divider span {
    padding: 0 16px;
}

.social-signup {
    margin-bottom: 24px;
}

.social-btn {
    width: 100%;
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background: white;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: background 0.2s, border-color 0.2s;
}

.social-btn:hover {
    background: #f7fafc;
    border-color: #cbd5e0;
}

.login-link {
    text-align: center;
    color: #4a5568;
    font-size: 14px;
    margin-top: 24px;
}

.login-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.login-link a:hover {
    text-decoration: underline;
}

.back-home {
    text-align: center;
    margin-top: 16px;
}

.back-home a {
    color: #718096;
    text-decoration: none;
    font-size: 14px;
}

.back-home a:hover {
    color: #667eea;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 40px;
    border-radius: 16px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-content h2 {
    color: #1a202c;
    margin-bottom: 16px;
    text-align: center;
}

.modal-content p {
    color: #4a5568;
    margin-bottom: 24px;
    text-align: center;
    font-size: 14px;
}

.verify-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 12px;
}

.verify-btn:hover {
    opacity: 0.9;
}

.resend-btn {
    width: 100%;
    padding: 12px;
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.resend-btn:hover {
    background: #f7fafc;
}

@media (max-width: 480px) {
    .signup-box {
        padding: 30px 24px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: 30px 24px;
    }
}