:root {
    --zalo-width: 180px;
    --zalo-width-collapsed: 52px;
    --zalo-radius: 26px;
    --zalo-cyan: #00d9ff;
    --zalo-cyan-strong: #00faff;
    --zalo-text: #0084ff;
}

/* Khung ngoài */
.zalo-style-menu {
    position: fixed;
    left: 8px;
    top: 12px;
    bottom: 12px;
    width: var(--zalo-width);
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 9999;
    padding: 6px 0 10px;
    transition: width .25s ease;
}

.zalo-style-menu.collapsed {
    width: var(--zalo-width-collapsed);
}

/* Nút toggle */
.zalo-toggle {
    position: absolute;
    top: 50%;
    right: -10px;
    transform: translateY(-50%);
    width: 22px;
    height: 72px;
    border-radius: 999px;
    border: 1px solid rgba(0, 149, 255, .18);
    background: linear-gradient(180deg, #ffffff, #eaf9ff);
    box-shadow: 0 6px 18px rgba(0, 149, 255, .18);
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease, right .2s ease;
}

.zalo-toggle i {
    font-size: 18px;
    color: #0db7ff;
    line-height: 1;
}

.zalo-style-menu.collapsed .zalo-toggle {
    right: -8px;
}

@media (hover:hover) {
    .zalo-toggle:hover {
        transform: translateY(-50%) scale(1.02);
        box-shadow: 0 8px 24px rgba(0, 149, 255, .28);
    }
}

.zalo-toggle::after {
    content: '';
    position: absolute;
    inset: -10px;
}

/* Tiêu đề */
.zalo-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 14px;
    margin-bottom: 6px;
    background: linear-gradient(145deg, #c5f6ff, #e6ffff);
    border: 2px solid rgba(0, 229, 255, .5);
    border-radius: 20px;
    color: var(--zalo-cyan);
    font-weight: 800;
    font-size: 14px;
    box-shadow: 0 0 12px rgba(0, 255, 255, .6), 0 0 20px rgba(0, 255, 255, .3);
    user-select: none;
    transition: all .25s ease;
}

.zalo-title:hover {
    transform: scale(1.03);
}

/* Vùng cuộn */
.zalo-scroll {
    flex: 1 1 auto;
    overflow-y: auto;
    padding-right: 6px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    -webkit-overflow-scrolling: touch;
}

/* Thanh cuộn */
.zalo-scroll::-webkit-scrollbar {
    width: 8px;
}

.zalo-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.zalo-scroll::-webkit-scrollbar-thumb {
    background: rgba(0, 149, 255, .25);
    border-radius: 8px;
}

/* Fade gợi ý kéo */
.zalo-fade {
    pointer-events: none;
    position: absolute;
    left: 0;
    width: 100%;
    height: 24px;
}

.zalo-fade.top {
    top: 52px;
    background: linear-gradient(#e6ffff88, transparent);
    opacity: .35;
}

.zalo-fade.bottom {
    bottom: 0;
    background: linear-gradient(transparent, #e6ffff66);
    opacity: .35;
}

/* Item */
.zalo-item {
    display: flex;
    align-items: center;
    background: linear-gradient(to right, #ffffff, #f6fbff);
    border-radius: var(--zalo-radius);
    padding: 5px 10px 5px 5px;
    box-shadow: 0 2px 8px rgba(0, 149, 255, .1);
    text-decoration: none;
    transition: all .25s ease-in-out;
    font-weight: 600;
    color: var(--zalo-text);
    font-size: 12px;
    min-width: 145px;
    border: 1px solid rgba(0, 149, 255, .08);
    white-space: nowrap;
    overflow: hidden;
}

.zalo-item:hover {
    box-shadow: 0 0 10px var(--zalo-cyan-strong), 0 0 18px var(--zalo-cyan-strong);
    transform: scale(1.03);
    background: linear-gradient(to right, #e5faff, #ffffff);
    color: #00cfff;
}

.zalo-circle {
    width: 28px;
    height: 28px;
    flex: 0 0 28px;
    margin-right: 8px;
    background: radial-gradient(circle at 30% 30%, #00bfff, #0084ff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 15px;
    box-shadow: 0 0 8px rgba(0, 149, 255, .4);
    transition: transform .25s ease, box-shadow .25s ease;
}

.zalo-circle i {
    font-size: 16px;
}

.zalo-item:hover .zalo-circle {
    transform: rotate(4deg) scale(1.08);
}

/* Thu gọn: ẩn chữ, giữ icon */
.zalo-style-menu.collapsed .zalo-title-text {
    display: none;
}

.zalo-style-menu.collapsed .zalo-item span {
    width: 0;
    margin: 0;
    padding: 0;
    opacity: 0;
}

.zalo-style-menu.collapsed .zalo-item {
    justify-content: center;
    padding: 6px;
    min-width: auto;
}

.zalo-style-menu.collapsed .zalo-circle {
    margin-right: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .zalo-toggle {
        width: 28px;
        height: 84px;
    }

    .zalo-toggle i {
        font-size: 20px;
    }
}

@media (max-height: 580px) {
    .zalo-title {
        margin-bottom: 4px;
    }
}