.um-chat-launcher {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: var(--z-chat, 1900);
    width: 58px;
    height: 58px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(145deg, #b0002a, #780115);
    color: #fff;
    box-shadow: 0 14px 28px rgba(120, 1, 21, 0.35), 0 2px 6px rgba(15, 23, 42, 0.25);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.um-chat-launcher:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(120, 1, 21, 0.42), 0 4px 10px rgba(15, 23, 42, 0.28);
    filter: saturate(1.08);
}

.um-chat-launcher:active {
    transform: translateY(0) scale(0.97);
}

.um-chat-launcher-badge {
    position: absolute;
    top: -4px;
    right: -2px;
    min-width: 22px;
    height: 22px;
    border-radius: 999px;
    padding: 0 6px;
    background: #ef4444;
    color: #fff;
    font-weight: 700;
    font-size: 0.72rem;
    display: none;
    align-items: center;
    justify-content: center;
    border: 2px solid #fff;
}

.um-chat-panel {
    position: fixed;
    right: 18px;
    bottom: 88px;
    z-index: var(--z-chat, 1900);
    width: min(620px, calc(100vw - 30px));
    height: min(440px, calc(100vh - 110px));
    background: #fff;
    border: 1px solid #e7e7ec;
    border-radius: 18px;
    box-shadow: 0 30px 60px rgba(15, 23, 42, 0.24), 0 8px 24px rgba(15, 23, 42, 0.12);
    overflow: hidden;
    display: none;
    transform-origin: bottom right;
}

.um-chat-panel.open {
    display: grid;
    grid-template-rows: 50px 1fr;
    animation: umChatPanelIn 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes umChatPanelIn {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.um-chat-header {
    background: linear-gradient(140deg, #8f001f, #b0002a);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px 0 14px;
    font-weight: 700;
    font-size: 1.02rem;
}

.um-chat-close-btn {
    border: none;
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    width: 30px;
    height: 30px;
    border-radius: 10px;
    transition: background-color 0.2s ease;
}

.um-chat-close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.um-chat-body {
    display: grid;
    grid-template-columns: 1fr;
    min-height: 0;
    background: #fafafc;
}

.um-chat-sidebar {
    min-height: 0;
    background: #fff;
    height: 100%;
}

.um-chat-list {
    height: 100%;
    overflow: auto;
    padding: 6px;
}

.um-chat-list-item {
    border: 1px solid transparent;
    width: 100%;
    text-align: left;
    padding: 7px 8px;
    border-radius: 10px;
    background: #fff;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.16s ease, box-shadow 0.2s ease;
    margin-bottom: 4px;
    animation: umItemFadeIn 0.22s ease both;
}

.um-chat-list-item:hover {
    background: #faf7f8;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.07);
}

.um-chat-list-item.active {
    background: #fff5f7;
    border-color: #f2c7d2;
}

.um-chat-item-title {
    font-weight: 700;
    color: #111827;
    font-size: 0.85rem;
}

.um-chat-item-preview {
    color: #64748b;
    font-size: 0.78rem;
    margin-top: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.um-chat-item-meta {
    display: flex;
    gap: 8px;
    margin-top: 3px;
    align-items: center;
}

.um-chat-item-time {
    color: #94a3b8;
    font-size: 0.72rem;
}

.um-chat-item-unread {
    background: #ef4444;
    color: #fff;
    border-radius: 999px;
    min-width: 18px;
    height: 18px;
    font-size: 0.68rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 6px;
    font-weight: 700;
}

.um-chat-thread {
    display: grid;
    grid-template-rows: 42px 1fr auto;
    min-height: 0;
    background: #f4f5f8;
    height: 100%;
}

.um-chat-thread-header {
    border-bottom: 1px solid #e8eaf0;
    display: flex;
    align-items: center;
    padding: 0 9px;
    font-size: 0.88rem;
    font-weight: 700;
    color: #111827;
    background: #fff;
}

.um-chat-back-btn {
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 8px;
    background: #eef1f6;
    color: #364152;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 8px;
}

.um-chat-back-btn:hover {
    background: #e3e8f0;
}

.um-chat-back-btn:active {
    transform: scale(0.96);
}

.um-chat-panel.list-mode .um-chat-thread {
    display: none;
}

.um-chat-panel.thread-mode .um-chat-sidebar {
    display: none;
}

.um-chat-thread-messages {
    padding: 8px;
    overflow: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.um-chat-bubble {
    max-width: min(70%, 430px);
    padding: 7px 9px;
    border-radius: 12px;
    line-height: 1.4;
    font-size: 0.8rem;
    word-break: break-word;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
    animation: umBubbleIn 0.18s ease both;
}

.um-chat-bubble.mine {
    align-self: flex-end;
    background: linear-gradient(135deg, #98001f, #7c0019);
    color: #fff;
    border-bottom-right-radius: 5px;
}

.um-chat-bubble.other {
    align-self: flex-start;
    background: #fff;
    color: #0f172a;
    border: 1px solid #e5e7eb;
    border-bottom-left-radius: 5px;
}

.um-chat-bubble-time {
    margin-top: 2px;
    font-size: 0.66rem;
    opacity: 0.72;
}

.um-chat-thread-input-wrap {
    border-top: 1px solid #e8eaf0;
    padding: 7px 8px 8px;
    display: flex;
    gap: 6px;
    background: #fff;
}

.um-chat-thread-input-wrap textarea {
    resize: none;
    min-height: 34px;
    max-height: 86px;
    border-radius: 10px;
    border: 1px solid #d4d9e2;
    background: #f9fafc;
    padding: 7px 9px;
    width: 100%;
    outline: none;
    font-size: 0.86rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.um-chat-thread-input-wrap textarea:focus {
    border-color: #b0002a;
    box-shadow: 0 0 0 3px rgba(176, 0, 42, 0.12);
}

.um-chat-thread-input-wrap button {
    border: none;
    border-radius: 10px;
    background: linear-gradient(140deg, #b0002a, #7c0019);
    color: #fff;
    padding: 0 11px;
    font-weight: 700;
    white-space: nowrap;
    font-size: 0.92rem;
    transition: transform 0.15s ease, filter 0.2s ease;
}

.um-chat-thread-input-wrap button:hover {
    filter: brightness(1.04);
    transform: translateY(-1px);
}

.um-chat-thread-input-wrap button:active {
    transform: translateY(1px);
}

.um-chat-empty {
    color: #64748b;
    font-size: 0.82rem;
    padding: 12px;
}

@keyframes umItemFadeIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes umBubbleIn {
    from {
        opacity: 0;
        transform: translateY(3px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (prefers-reduced-motion: reduce) {
    .um-chat-panel.open,
    .um-chat-list-item,
    .um-chat-bubble {
        animation: none !important;
    }

    .um-chat-launcher,
    .um-chat-list-item,
    .um-chat-thread-input-wrap button,
    .um-chat-back-btn {
        transition: none !important;
    }
}

@media (max-width: 992px) {
    .um-chat-panel {
        right: 10px;
        bottom: 78px;
        width: calc(100vw - 20px);
        height: calc(100dvh - 90px);
        border-radius: 16px;
    }

    .um-chat-body {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 767.98px) {
    .um-chat-launcher {
        right: 12px;
        bottom: 12px;
        width: 54px;
        height: 54px;
    }

    .um-chat-panel {
        right: 6px;
        left: 6px;
        width: auto;
        bottom: 74px;
        height: calc(100dvh - 80px);
        border-radius: 14px;
    }

    .um-chat-panel.open {
        grid-template-rows: 52px 1fr;
    }

    .um-chat-header {
        padding: 0 10px 0 12px;
    }

    .um-chat-list {
        padding: 6px;
    }

    .um-chat-list-item {
        padding: 9px 10px;
        border-radius: 10px;
    }

    .um-chat-thread {
        grid-template-rows: 48px 1fr auto;
    }

    .um-chat-thread-header {
        padding: 0 10px;
        font-size: 0.94rem;
    }

    .um-chat-thread-messages {
        padding: 10px;
    }

    .um-chat-bubble {
        max-width: min(88%, 520px);
    }

    .um-chat-thread-input-wrap {
        padding: 9px 10px 10px;
        gap: 6px;
    }

    .um-chat-thread-input-wrap textarea {
        min-height: 40px;
        font-size: 0.9rem;
    }
}