.header-activity {
    background: linear-gradient(90deg, #fbb37f, #f28c45);
    padding: 2rem 1rem;
    text-align: center;
}

    .header-activity h3 {
        color: #fff;
        font-weight: 800;
        font-size: 2rem;
        text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
    }

    .header-activity p {
        color: #fff;
        font-size: 1rem;
        margin-top: .5rem;
    }

/* 搜尋框 */
.search-box {
    border-radius: 30px;
    padding: .6rem 1rem;
    box-shadow: 0 0 6px rgba(0,0,0,0.1);
    border: 1px solid #ccc;
    width: 250px;
    margin-top: 40px;
}

/* 篩選按鈕 */
.btn-outline-success, .btn-outline-secondary {
    border-radius: 50px;
    font-weight: bold;
    transition: all 0.3s;
    margin-top:40px;
}

    .btn-outline-success:hover, .btn-outline-secondary:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    }

/* 卡片樣式 */
.card {
    border-radius: 16px;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

    .card:hover {
        transform: translateY(-6px);
        box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    }

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: #f28c45;
}

.card-text {
    font-size: 0.9rem;
}

.btn-join {
    background: linear-gradient(45deg, #fbb37f, #f28c45);
    border: none;
    border-radius: 24px;
    padding: 0.35rem 1rem; /* 縮小左右內距 */
    font-size: 0.85rem; /* 字再小一點 */
    font-weight: 600;
    color: #fff;
    transition: all 0.3s;
    min-width: 100px; /* 限制一個比較窄的最小寬度 */
    max-width: 120px; /* 防止過寬 */
    text-align: center;
    text-decoration: none;
}

/* 取消報名按鈕 - 使用最高優先級 */
.activity-card-vertical .activity-actions .btn-join.btn-cancel,
.btn-join.btn-cancel {
    background: #dc3545 !important;
    background-image: none !important;
    border: 2px solid #fff !important;
    color: #fff !important;
}

.activity-card-vertical .activity-actions .btn-join.btn-cancel:hover,
.btn-join.btn-cancel:hover {
    background: #c82333 !important;
    background-image: none !important;
    border: 2px solid #fff !important;
}

    /* 半透明遮罩 */
    .activity-hero::before {
        content: "";
        position: absolute;
        inset: 0;
        background-color: rgba(0, 0, 0, 0.45); /* 深色遮罩，透明度可調 */
    }

.activity-hero {
    position: relative;
    height: 300px; /* 自己調整高度 */
    background: url('/images/activityback2.jpg') center center / cover no-repeat;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #fff;
    overflow: hidden;
}

    /* 文字內容在遮罩上層 */
    .activity-hero .hero-content {
        position: relative;
        z-index: 1;
    }

    .activity-hero h1 {
        font-size: 2rem;
        font-weight: 800;
        margin-bottom: 0.5rem;
        text-shadow: 1px 1px 3px rgba(0,0,0,0.4);
    }

    .activity-hero p {
        font-size: 1.2rem;
        text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
    }

.activity-card-vertical {
    display: flex;
    flex-direction: column;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
}

    .activity-card-vertical:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 16px rgba(0,0,0,0.12);
    }

    /* 圖片區塊 */
    .activity-card-vertical .activity-img {
        width: 100%;
        height: 180px;
        overflow: hidden;
    }

        .activity-card-vertical .activity-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

    /* 文字內容區 */
    .activity-card-vertical .activity-info {
        padding: 16px;
        display: flex;
        flex-direction: column;
        flex: 1;
    }

        .activity-card-vertical .activity-info h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #f28c45;
            margin-bottom: 8px;
        }

        .activity-card-vertical .activity-info p {
            margin: 2px 0;
            font-size: 0.9rem;
            color: #555;
        }

        .activity-card-vertical .activity-info .desc {
            color: #777;
            margin-bottom: 8px;
        }

    /* 按鈕區 */
    .activity-card-vertical .activity-actions {
        margin-top: auto; /* 撐到底部 */
        text-align: right;
    }

    .activity-card-vertical .btn-join {
        display: inline-block;
        background: linear-gradient(45deg, #fbb37f, #f28c45);
        border: none;
        border-radius: 20px;
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
        color: #fff;
        font-weight: 600;
        transition: background 0.3s ease;
    }

        .activity-card-vertical .btn-join:hover {
            background: linear-gradient(45deg, #f28c45, #f56a0f);
        }

.filter-btn {
    display: inline-block;
    text-decoration: none;
    border: 1px solid #f28c45; /* 邊框珊瑚橘 */
    background-color: #fff;
    color: #f28c45; /* 文字珊瑚橘 */
    border-radius: 50px;
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
    margin-top: 10px;
    line-height: 1.2;
}

    /* 滑鼠移上去時 */
    .filter-btn:hover {
        background-color: #f28c45; /* 背景珊瑚橘 */
        color: #fff; /* 文字白 */
        border-color: #f28c45; /* 邊框也跟著珊瑚橘 */
    }

    /* 被選取的狀態 */
    .filter-btn.active {
        background-color: #f28c45;
        color: #fff;
        border-color: #f28c45;
        box-shadow: none;
    }

/* 覆寫 Bootstrap 的 btn-outline-success 為珊瑚橘 */
.btn-outline-success {
    border-color: #f28c45 !important;
    color: #f28c45 !important;
    background-color: #fff !important;
}

    .btn-outline-success:hover,
    .btn-outline-success.active,
    .btn-outline-success:focus {
        background-color: #f28c45 !important;
        color: #fff !important;
        border-color: #f28c45 !important;
    }
.search-box:focus {
    border-color: #f28c45; /* 邊框改珊瑚橘 */
    box-shadow: 0 0 5px rgba(242, 140, 69, 0.6); /* 外框光暈珊瑚橘 */
    outline: none; /* 移除預設藍色外框 */
}
.btn-filter:focus,
.btn-filter:active {
    outline: none !important;
    border-color: #f28c45 !important;
    box-shadow: 0 0 5px rgba(242,140,69,0.6) !important; /* 橘色光暈 */
}