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    <title>인증 코드</title>
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                            <h1 style="margin: 0; color: #ffffff; font-size: 24px; font-weight: 600;">인증 코드</h1>
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                            <p style="margin: 0 0 16px; font-size: 16px; color: #333;">안녕하세요, <strong>{{ $signerName }}</strong>님.</p>
                            <p style="margin: 0 0 24px; font-size: 15px; color: #555; line-height: 1.6;">
                                전자계약 서명을 위한 인증 코드입니다.<br>
                                아래 코드를 입력해 주세요.
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                                            <span style="font-size: 36px; font-weight: 700; letter-spacing: 12px; color: #2563eb;">{{ $otpCode }}</span>
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                                        <div style="margin-top: 12px;">
                                            <span style="display: inline-block; background-color: #eef2ff; border: 1px solid #c7d2fe; border-radius: 6px; padding: 6px 16px; font-size: 14px; color: #4338ca; font-family: monospace; letter-spacing: 2px; cursor: text; -webkit-user-select: all; user-select: all;">{{ $otpCode }}</span>
                                            <span style="display: inline-block; margin-left: 4px; font-size: 12px; color: #6366f1; vertical-align: middle;">&#128203; 길게 눌러 복사</span>
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                            <p style="margin: 24px 0 0; font-size: 13px; color: #999; line-height: 1.6;">
                                이 코드는 5분간 유효합니다. 본인이 요청하지 않았다면 이 메일을 무시해 주세요.
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                            <p style="margin: 0; font-size: 12px; color: #999;">
                                본 메일은 SAM 전자계약 시스템에서 자동 발송되었습니다.<br>
                                (주)코드브릿지엑스
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