body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont,
        "Segoe UI", Helvetica, Arial,
        "Noto Sans KR", sans-serif;
    background: #f6f8fa;
    color: #24292f;
    box-sizing: border-box;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

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

.hero-card {
    width: 420px;
    max-width: 100%;
    background: #ffffff;
    padding: 42px 36px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(27, 31, 36, 0.08);
    border: 1px solid #d0d7de;
    text-align: center;
}

.logo {
    font-size: 30px;
    font-weight: 700;
    color: #24292f;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 16px;
    color: #57606a;
    margin-bottom: 14px;
}

.desc {
    font-size: 14px;
    color: #0969da;
    font-weight: 600;
    line-height: 1.6;
    margin-bottom: 28px;
}

.info {
    background: #f6f8fa;
    border: 1px solid #d8dee4;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 28px;
    text-align: left;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: #57606a;
    line-height: 1.8;
}

.icon {
    width: 22px;
    text-align: center;
    font-size: 20px;
    color: #57606a;
}

.actions {
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: stretch;
}

.btn {
    display: block;
    width: 100%;
    padding: 12px 14px;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    font-size: 14px;
    transition: background 0.15s, transform 0.1s;
    border: 1px solid rgba(27, 31, 36, 0.15);
}

.btn.primary {
    background: #2da44e;
    color: white;
}

.btn.primary:hover {
    background: #2c974b;
}

.btn:active {
    transform: scale(0.98);
}

@media (max-width: 768px) {
    .hero-card {
        width: 100%;
        padding: 30px 22px;
        border-radius: 8px;
    }

    .logo {
        font-size: 25px;
    }

    .subtitle {
        font-size: 15px;
    }

    .desc {
        font-size: 13px;
    }

    .info-item {
        font-size: 12px;
    }

    .btn {
        font-size: 14px;
        padding: 12px;
    }
}