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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #f5f5f5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    margin: 0;
}

.container {
    width: 100%;
    max-width: 445px;
}

.signup-card {
    background: white;
    border-radius: 16px;
    padding: 48px 75px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    width: 450px;
}

.title {
    text-align: center;
    font-size: 24px;
    font-weight: 600;
    color: #333;
    margin-bottom: 30px;
}

.signup-form {
    display: flex;
    flex-direction: column;
    /* margin-left: -5px;
    margin-right: -5px; */
    gap: 16px;
}

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

.label {
    font-size: 14px;
    color: #666;
    font-weight: 500;
}

.input-wrapper {
    display: flex;
    gap: 8px;
}

.input {
    flex: 1;
    padding: 12px 16px;
    border: none;
    background-color: #f0f0f0;
    border-radius: 6px;
    font-size: 14px;
    outline: none;
}

.input:focus {
    background-color: #e8e8e8;
}

.check-btn {
    padding: 12px 20px;
    background-color: #4a7cff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.submit-btn {
    margin-top: 10px;
    padding: 14px;
    background-color: #4a7cff;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
}

.message {
    font-size: 12px;
}

.message.success {
    color: #22c55e;
}

.message.error {
    color: #ef4444;
}

.error-messages .error {
    color: #ef4444;
    font-size: 14px;
}

.social-login {
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid #e0e0e0;
    text-align: center;
}

.social-title-1 {
    font-size: 14px;
    color: #666;
    margin-bottom: 12px;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.social-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: white;
    border: 0.5px solid #e0e0e0;
    transition: all 0.3s ease;
    cursor: pointer;
}

.social-icon:hover {
    border-color: #4285f4;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(66, 133, 244, 0.2);
}

.social-icon img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
}

/* 태블릿 (768px 이하) */
@media (max-width: 768px) {
    .container {
        width: 400px;
    }
    
    .signup-card { 
        width: 100%;
        padding: 40px 60px;
    }
    
    .title {
        font-size: 22px;
        margin-bottom: 28px;
    }
    
    .label {
        font-size: 13px;
    }
    
    .input {
        padding: 11px 14px;
        font-size: 13px;
    }
    
    .check-btn {
        padding: 11px 18px;
        font-size: 13px;
    }
    
    .submit-btn {
        padding: 12px;
        font-size: 15px;
    }
    
    .message {
        font-size: 11px;
    }
    
    .social-login {
        margin-top: 28px;
        padding-top: 28px;
    }
    
    .social-title-1 {
        font-size: 13px;
        margin-bottom: 10px;
    }
    
    .social-icons {
        gap: 14px;
    }
    
    .social-icon {
        width: 42px;
        height: 42px;
    }
}

/* 모바일 (480px 이하) */
@media (max-width: 480px) {
    body {
        padding: 15px;
    }
    
    .container {
        width: 350px;
    }
    
    .signup-card {
        width: 100%;
        padding: 32px 24px;
    }
    
    .title {
        font-size: 20px;
        margin-bottom: 24px;
    }
    
    .signup-form {
        gap: 14px;
    }
    
    .form-group {
        gap: 6px;
    }
    
    .label {
        font-size: 13px;
    }
    
    .input {
        padding: 11px 14px;
        font-size: 13px;
    }
    
    .check-btn {
        padding: 11px 16px;
        font-size: 13px;
    }
    
    .submit-btn {
        padding: 12px;
        font-size: 14px;
        margin-top: 6px;
    }
    
    .message {
        font-size: 11px;
    }
    
    .error-messages .error {
        font-size: 13px;
    }
    
    .social-login {
        margin-top: 24px;
        padding-top: 24px;
    }
    
    .social-title-1 {
        font-size: 13px;
        margin-bottom: 10px;
    }
    
    .social-icons {
        gap: 12px;
    }
    
    .social-icon {
        width: 40px;
        height: 40px;
    }
}

/* 극소형 모바일 (360px 이하) */
@media (max-width: 360px) {
    .container {
        width: 320px;
    }
    
    .signup-card {
        width: 100%;
        padding: 28px 20px;
    }
    
    .title {
        font-size: 18px;
        margin-bottom: 20px;
    }
    
    .signup-form {
        gap: 12px;
    }
    
    .label {
        font-size: 12px;
    }
    
    .input {
        padding: 10px 12px;
        font-size: 12px;
    }
    
    .check-btn {
        padding: 10px 14px;
        font-size: 12px;
    }
    
    .submit-btn {
        padding: 10px;
        font-size: 13px;
    }
    
    .message {
        font-size: 10px;
    }
    
    .social-login {
        margin-top: 20px;
        padding-top: 20px;
    }
    
    .social-title-1 {
        font-size: 12px;
    }
    
    .social-icons {
        gap: 10px;
    }
    
    .social-icon {
        width: 38px;
        height: 38px;
    }
}