body, html {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
}

.landing {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(160deg, #eff6ff 0%, #dbeafe 100%);
    padding: 24px;
    box-sizing: border-box;
}

.landing-card {
    width: 100%;
    max-width: 380px;
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.12);
    padding: 40px 32px;
    text-align: center;
    box-sizing: border-box;
}

.landing-logo {
    font-size: 42px;
    line-height: 1;
    margin-bottom: 8px;
}

.landing-card h1 {
    margin: 0;
    font-size: 26px;
    font-weight: 800;
    color: #1e293b;
    letter-spacing: -0.02em;
}

.landing-sub {
    margin: 6px 0 0;
    font-size: 14px;
    font-weight: 600;
    color: #2563eb;
}

.landing-desc {
    margin: 16px 0 28px;
    font-size: 13px;
    line-height: 1.6;
    color: #64748b;
}

.landing-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 46px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    transition: filter 0.15s ease;
}

.login-btn:hover {
    filter: brightness(0.96);
}

.login-btn.kakao {
    background: #FEE500;
    color: #191919;
}

.login-btn.naver {
    background: #03C75A;
    color: #ffffff;
}

.login-ic {
    font-size: 15px;
    line-height: 1;
}

.landing-error {
    margin-top: 18px;
    padding: 10px 12px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 8px;
    color: #b91c1c;
    font-size: 12px;
    font-weight: 600;
}

@media (prefers-color-scheme: dark) {
    .landing {
        background: linear-gradient(160deg, #0f172a 0%, #1e293b 100%);
    }
    .landing-card {
        background: #1e293b;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    }
    .landing-card h1 {
        color: #f1f5f9;
    }
    .landing-desc {
        color: #94a3b8;
    }
}