/* ===== CSKH ICON - GAMING NEON ===== */
.cskh-icon{
    position: fixed;
    bottom: 70px; /* tránh đè bottom-banner */
    right: 22px;

    width: 58px;
    height: 58px;
    border-radius: 50%;

    display:flex;
    align-items:center;
    justify-content:center;

    cursor:pointer;
    z-index: 9999;

    background: linear-gradient(135deg, rgba(0,255,255,.18), rgba(255,0,204,.16));
    border: 1px solid rgba(255,255,255,0.10);
    box-shadow: 0 14px 30px rgba(0,0,0,.55);
    backdrop-filter: blur(10px);

    color:#fff;
    font-size: 24px;
    transition: .22s ease;
}

.cskh-icon:hover{
    transform: translateY(-2px) scale(1.05);
    border-color: rgba(0,255,255,0.35);
    box-shadow: 0 20px 40px rgba(0,0,0,.7);
}

.cskh-icon:active{
    transform: scale(0.96);
}

/* ===== CSKH BOX - GLASS ===== */
.cskh-box{
    position: fixed;
    bottom: 135px; /* icon + khoảng cách */
    right: 22px;

    width: 330px;
    max-width: calc(100vw - 30px);

    background: rgba(15, 15, 25, 0.92);
    border: 1px solid rgba(255,255,255,0.10);
    border-radius: 16px;

    box-shadow: 0 18px 45px rgba(0,0,0,.65);
    backdrop-filter: blur(10px);

    display: none;
    z-index: 9999;
    overflow:hidden;

    animation: cskhPop .22s ease;
}

/* neon line top */
.cskh-box::before{
    content:"";
    position:absolute;
    left:16px;
    right:16px;
    top:-1px;
    height:2px;
    background:linear-gradient(90deg, transparent, #00ffff, #ff00cc, transparent);
    opacity:.9;
}

@keyframes cskhPop{
    from{ opacity:0; transform: translateY(12px) scale(.98); }
    to{ opacity:1; transform: translateY(0) scale(1); }
}

/* HEADER */
.cskh-header{
    padding: 12px 14px;
    border-radius: 16px 16px 0 0;

    display:flex;
    align-items:center;
    justify-content: space-between;

    background: rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.cskh-header span,
.cskh-header h4{
    color:#fff;
    font-weight: 800;
    letter-spacing: .3px;
    font-size: 14px;
}

/* nút đóng */
.cskh-header button{
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.10);
    color:#fff;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    cursor:pointer;
    font-size: 16px;
    transition:.2s;
}

.cskh-header button:hover{
    transform: translateY(-1px);
    border-color: rgba(255,255,255,0.20);
    background: rgba(255,255,255,0.08);
}

/* FORM */
.cskh-box form{
    padding: 14px;
}

/* TEXTAREA */
.cskh-box textarea{
    width:100%;
    height:95px;
    resize:none;

    padding: 12px 12px;
    border-radius: 14px;

    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.10);

    color:#fff;
    font-size: 13.5px;
    line-height: 1.5;
    outline:none;
    transition:.2s;
}

.cskh-box textarea::placeholder{
    color: rgba(255,255,255,0.55);
}

.cskh-box textarea:focus{
    border-color: rgba(0,255,255,0.55);
    box-shadow: 0 0 0 4px rgba(0,255,255,0.12);
}

/* BUTTON SEND */
.cskh-box button{
    width:100%;
    margin-top: 10px;

    padding: 12px 14px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.10);

    background: linear-gradient(135deg, rgba(0,255,255,.18), rgba(255,0,204,.16));
    color:#fff;

    font-weight: 900;
    letter-spacing:.3px;
    cursor:pointer;
    transition:.25s;
    box-shadow: 0 10px 22px rgba(0,0,0,.35);
}

.cskh-box button:hover{
    transform: translateY(-2px);
    border-color: rgba(0,255,255,0.35);
    box-shadow: 0 16px 30px rgba(0,0,0,.55);
}

.cskh-box button:active{
    transform: scale(0.97);
}

/* MOBILE */
@media (max-width: 480px){
    .cskh-icon{
        right: 14px;
        bottom: 72px;
    }
    .cskh-box{
        right: 14px;
        width: 92%;
    }
}