/* ====== NỀN TRANG (NHẸ, KHÔNG CHÓI) ====== */
body {
    background: linear-gradient(180deg, #f3f7fc, #eef3f8);
}

/* ====== CARD CHỨA FORM ====== */
.ck-card {
    background: #C0F0C0;
    border-radius: 16px;
    padding: 26px 30px;
    max-width: 1100px;
    margin: auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

/* ====== TIÊU ĐỀ ====== */
/* ====== TIÊU ĐỀ FORM ====== */
.ck-title {
    font-size: 1.45rem;
    font-weight: 600;
    text-align: center;
    color: #0b5ed7;
    padding: 14px 18px;
    margin-bottom: 26px;
    background: linear-gradient(90deg, #e3f2ff, #f6fbff, #e3f2ff);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

/* ====== LABEL ====== */
.ck-card .form-label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 6px;
}

/* ====== INPUT ====== */
.ck-card .form-control {
    border-radius: 10px;
    border: 1px solid #d6dee8;
    padding: 10px 12px;
    background-color: #ffffff;
    transition: all 0.2s ease;
}

    .ck-card .form-control:hover {
        border-color: #b6c7e2;
    }

    .ck-card .form-control:focus {
        border-color: #0d6efd;
        box-shadow: 0 0 0 0.15rem rgba(13, 110, 253, 0.2);
    }

/* ====== KHOẢNG CÁCH CỘT ====== */
.ck-card .row {
    row-gap: 10px;
}

/* ====== FILE LIST ====== */
.ck-card .list-group-item {
    border-radius: 10px;
    margin-bottom: 6px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
}

/* ====== BUTTON CHUNG ====== */
.ck-card .btn {
    border-radius: 12px;
    padding: 8px 22px;
    font-weight: 500;
    transition: all 0.2s ease;
}

/* ====== NÚT PRIMARY ====== */
.ck-card .btn-primary {
    background: linear-gradient(180deg, #3b82f6, #2563eb);
    border: none;
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

    .ck-card .btn-primary:hover {
        transform: translateY(-1px);
        box-shadow: 0 10px 22px rgba(37, 99, 235, 0.45);
    }

/* ====== NÚT SECONDARY ====== */
.ck-card .btn-secondary {
    background: linear-gradient(180deg, #adb5bd, #6c757d);
    border: none;
    box-shadow: 0 4px 12px rgba(108, 117, 125, 0.35);
}

    .ck-card .btn-secondary:hover {
        transform: translateY(-1px);
        box-shadow: 0 8px 18px rgba(108, 117, 125, 0.45);
    }

/* ====== NÚT OUTLINE ====== */
.ck-card .btn-outline-danger,
.ck-card .btn-outline-secondary {
    border-radius: 10px;
    transition: all 0.2s ease;
}

    .ck-card .btn-outline-danger:hover,
    .ck-card .btn-outline-secondary:hover {
        background-color: rgba(0, 0, 0, 0.03);
    }

/* ====== MOBILE ====== */
@media (max-width: 768px) {
    .ck-card {
        padding: 20px;
    }

    .ck-title {
        font-size: 1.25rem;
    }
}