.chat-panel
{
    display: grid;
    grid-template-rows: auto 1fr auto;
    height: 100vh;
    min-height: 0;
    overflow: hidden;
}


.chat-header
{
    position: sticky;
    z-index: 15;
    top: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    align-items: center;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--panel);
}

.chat-header-tools
{
    display: flex;
    gap: 8px;
    align-items: center;
}


.persona-picker
{
    position: relative;
    width: min(360px, 100%);
}

.persona-title
{
    min-width: 0;
    overflow: hidden;
    font-size: 18px;
    font-weight: 700;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.persona-button
{
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
    align-items: center;
    width: 100%;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 9px 12px;
    font-family: inherit;
    color: var(--text);
    background: transparent;
    cursor: pointer;
    text-align: left;
}

.persona-button svg
{
    width: 16px;
    height: 16px;
    color: var(--text-dim);
    opacity: 0;
}

.persona-button:focus
{
    border-color: #8bcfc6;
    box-shadow: 0 0 0 3px #d7f3ec;
    background: var(--panel-soft);
    outline: none;
}

.persona-button:hover,
.persona-button[aria-expanded="true"]
{
    border-color: #8bcfc6;
    background: #eef8f6;
}

.persona-button:hover svg,
.persona-button:focus svg,
.persona-button[aria-expanded="true"] svg
{
    opacity: 1;
}

.persona-button.unavailable,
.persona-button:disabled
{
    color: var(--text-dim);
    cursor: not-allowed;
}

.persona-button:disabled:hover
{
    border-color: transparent;
    background: transparent;
}

.persona-menu-panel
{
    position: absolute;
    z-index: 20;
    top: calc(100% + 8px);
    left: 0;
    width: min(380px, calc(100vw - 48px));
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 6px;
    background: var(--panel);
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.14);
}

.persona-menu-panel[hidden]
{
    display: none;
}

.persona-menu-item
{
    display: block;
    width: 100%;
    border: 0;
    border-radius: 6px;
    padding: 10px;
    font-family: inherit;
    color: var(--text);
    background: transparent;
    cursor: pointer;
    text-align: left;
}

.persona-menu-item:hover,
.persona-menu-item:focus,
.persona-menu-item[aria-selected="true"]
{
    background: var(--panel-soft);
    outline: none;
}

.persona-menu-item[aria-selected="true"] .persona-menu-name
{
    color: var(--accent-hover);
}

.persona-menu-name
{
    display: block;
    overflow: hidden;
    font-size: 14px;
    font-weight: 800;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.persona-menu-role
{
    display: block;
    margin-top: 3px;
    overflow: hidden;
    font-size: 12px;
    color: var(--text-dim);
    line-height: 1.35;
    text-overflow: ellipsis;
    white-space: nowrap;
}


.messages-shell
{
    display: grid;
    grid-template-rows: auto 1fr;
    min-height: 0;
    overflow: hidden;
}

.chat-panel > .messages-shell
{
    background:
        radial-gradient(circle at 15% 10%, #d7f3ec, transparent 35%),
        radial-gradient(circle at 85% 20%, #e4eef9, transparent 40%),
        var(--bg);
}

.chat-usage-total
{
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    min-height: 18px;
    padding: 8px 24px 10px;
    color: var(--text-dim);
}

.chat-conversation-status
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 24px;
    background: transparent;
}

.chat-conversation-status .chat-usage-total
{
    min-height: 18px;
    margin-left: auto;
    padding: 0;
}


.chat-usage-total[hidden]
{
    display: none;
}

.chat-usage-total span
{
    display: inline-flex;
    align-items: center;
    font-size: 12px;
    font-weight: 400;
}

.messages
{
    min-height: 0;
    padding: 24px;
    background: transparent;
    overflow-y: auto;
}

.msg
{
    max-width: 820px;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px 16px;
    margin-bottom: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
    animation: fade-in 180ms ease;
}

.msg.user
{
    margin-left: auto;
    background: var(--user-bubble);
}

.msg.ai
{
    background: var(--ai-bubble);
}

.msg-action
{
    display: block;
    margin-top: 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 7px 10px;
    font-size: 13px;
    font-weight: 700;
    font-family: inherit;
    color: var(--accent-hover);
    background: var(--panel-soft);
    cursor: pointer;
}

.msg-action:hover,
.msg-action:focus
{
    border-color: #8bcfc6;
    background: #eef8f6;
    outline: none;
}

.msg-meta
{
    margin-top: 10px;
    border-top: 1px solid var(--border);
    padding-top: 8px;
    font-size: 12px;
    color: var(--text-dim);
}

.msg-usage
{
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
    align-items: center;
}

.msg-usage-title
{
    color: #7a8797;
    font-size: 12px;
    letter-spacing: 0;
}

.msg-usage-items
{
    display: flex;
    flex-wrap: wrap;
    gap: 6px 12px;
    align-items: center;
}

.msg-usage-item
{
    display: inline-flex;
    gap: 4px;
    align-items: center;
}

.msg-usage-label
{
    color: #8a96a6;
    font-size: 11px;
}

.msg-usage-value
{
    color: #465466;
    font-size: 12px;
    line-height: 1.2;
}

.msg-usage-cost
{
    color: #23766d;
    font-size: 11px;
    line-height: 1.2;
}

.msg-usage-cost::before
{
    content: "· ";
    color: #a0aec0;
}

.msg-meta-cost
{
    margin-left: 4px;
    color: #23766d;
}

.msg-meta-separator
{
    color: #a0aec0;
}

.composer
{
    border-top: 1px solid var(--border);
    background: var(--panel);
    padding: 16px;
}

.composer-wrap
{
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 54px 180px 1fr auto;
    gap: 10px;
}

.model-refresh
{
    width: 54px;
    min-height: 54px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 20px;
    line-height: 1;
    color: var(--text);
    background: var(--panel-soft);
    cursor: pointer;
}

.model-refresh:hover
{
    border-color: #8bcfc6;
    background: #eef8f6;
}

.model-refresh:focus
{
    border-color: #8bcfc6;
    box-shadow: 0 0 0 3px #d7f3ec;
    outline: none;
}

#modelSelect
{
    min-height: 54px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0 12px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    background: var(--panel-soft);
    outline: none;
}

#modelSelect:focus
{
    border-color: #8bcfc6;
    box-shadow: 0 0 0 3px #d7f3ec;
}

#modelSelect.unavailable
{
    color: var(--text-dim);
    background: #edf1f5;
    cursor: not-allowed;
}

#modelSelect:disabled,
#modelRefreshBtn:disabled,
#prompt:disabled,
#sendBtn:disabled
{
    opacity: 0.65;
    cursor: not-allowed;
}

#prompt
{
    resize: none;
    height: 54px;
    min-height: 54px;
    max-height: 220px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 15px;
    font-family: inherit;
    outline: none;
}

#prompt:focus
{
    border-color: #8bcfc6;
    box-shadow: 0 0 0 3px #d7f3ec;
}

#sendBtn
{
    border: 0;
    border-radius: 12px;
    padding: 0 18px;
    font-size: 15px;
    font-weight: 700;
    color: #ffffff;
    background: var(--accent);
    cursor: pointer;
}

#sendBtn:hover
{
    background: var(--accent-hover);
}

#sendBtn:disabled:hover
{
    background: var(--accent);
}

#modelRefreshBtn:disabled:hover
{
    border-color: var(--border);
    background: var(--panel-soft);
}


@media (max-width: 860px)
{
    .composer-wrap
    {
        grid-template-columns: 54px 1fr auto;
    }

    #modelSelect
    {
        grid-column: 2 / -1;
    }

    #prompt
    {
        grid-column: 1 / 3;
    }

    #sendBtn
    {
        grid-column: 3;
    }
}