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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 450px;
}

.signup-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    animation: fadeIn 0.5s ease-out;
}

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

.page-title {
    color: #333;
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
    font-weight: 600;
}

.signup-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

label {
    font-weight: 500;
    color: #555;
    font-size: 14px;
}

input[type="text"],
input[type="tel"],
input[type="number"],
select {
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: white;
}

input[type="text"]:focus,
input[type="tel"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.phone-input-group {
    display: flex;
    gap: 12px;
}

.country-select {
    flex: 0 0 120px;
    font-size: 14px;
}

#phoneNumber {
    flex: 1;
}

.btn {
    padding: 14px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: #28a745;
    color: white;
}

.btn-secondary:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(40, 167, 69, 0.3);
}

.otp-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.hidden {
    display: none;
}

.message-area {
    margin-top: 20px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
    min-height: 20px;
}

.message-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.otp-display {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
    font-weight: 600;
    margin-top: 10px;
}

/* Mobile Responsiveness */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .signup-card {
        padding: 30px 20px;
    }
    
    .page-title {
        font-size: 24px;
        margin-bottom: 25px;
    }
    
    .phone-input-group {
        flex-direction: column;
        gap: 10px;
    }
    
    .country-select {
        flex: none;
    }
    
    input[type="text"],
    input[type="tel"],
    input[type="number"],
    select {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

@media (max-width: 320px) {
    .signup-card {
        padding: 20px 15px;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 14px;
    }
}