.nittei-title {
    color: white;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 40px;
    letter-spacing: 2px;
}

.nittei-container {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 1200px;
    width: 90%;
    margin: auto;
}

.nittei-card {
    background: white;
    border-radius: 16px;
    padding: 30px 20px;
    width: 100%;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    text-align: center;
}

.nittei-year {
    color: #0b7bbf;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.nittei-date-container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    margin-bottom: 15px;
    gap: 6px;
}

.nittei-date {
    color: #0b7bbf;
    font-size: 72px;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -4px;
    display: flex;
    align-items: flex-end;
}

.nittei-date .nittei-slash {
    font-size: 40px;
    margin-bottom: 8px;
}

.nittei-day {
    color: white;
    background: #0b7bbf;
    border-radius: 50%;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    margin-left: 4px;
}

.nittei-format {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 20px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 12px;
    color: white;
}

.nittei-format.nittei-in-person {
    background: #ff6b3d;
}

.nittei-format.nittei-web {
    background: #00a95c;
}

.nittei-format i {
    font-size: 16px;
}

.nittei-time {
    color: #333;
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.nittei-deadline {
    color: #666;
    font-size: 13px;
    font-weight: 500;
}

/* PC閲覧時（960px以上）：3カラム */
@media (min-width: 960px) {
    .nittei-container {
        gap: 25px;
    }

    .nittei-card {
        width: calc(33.333% - 17px);
    }
}

/* タブレット〜スマホ（959px以下）：1カラム（横長レイアウト） */
@media (max-width: 959px) {
    .nittei-container {
        gap: 20px;
    }

    .nittei-card {
        width: 100%;
        max-width: 100%;
        display: flex;
        padding: 20px;
        text-align: left;
    }

    .nittei-card-left {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding-right: 15px;
        border-right: 2px solid #e0e0e0;
        min-width: 100px;
        flex-shrink: 0;

    }

    .nittei-card-right {
        display: flex;
        flex-direction: column;
        justify-content: center;
        padding-left: 15px;
        flex: 1;
        min-width: 0;
    }

    .nittei-year {
        font-size: 12px;
        margin-bottom: 3px;
    }

    .nittei-date {
        font-size: 29px;
        letter-spacing: 0;
    }

    .nittei-date .nittei-slash {
        font-size: 13px;
        margin-bottom: 5px;
    }

    .nittei-day {
        width: 20px;
        height: 20px;
        font-size: 14px;
        margin-left: 0;
    }

    .nittei-date-container {
        margin-bottom: 0;
        gap: 4px;
    }

    .nittei-format {
        margin-bottom: 6px;
        font-size: 13px;
        padding: 5px 16px;
    }

    .nittei-format i {
        font-size: 14px;
    }

    .nittei-time {
        font-size: 12px;
        margin-bottom: 6px;
    }

    .nittei-deadline {
        font-size: 11px;
    }
}