/*
 * Chat panel styles for Paper Assistant.
 *
 * Styles the collapsible right-side chat panel with message bubbles,
 * input area, and conversation header.
 */

/* ── Chat Panel ──────────────────────────────────────────────────────── */

.chat-panel {
    width: var(--chat-panel-width);
    min-width: var(--chat-panel-width);
    background: var(--chat-panel-bg);
    border-left: 1px solid var(--toolbar-sep-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

/* ── Header ──────────────────────────────────────────────────────────── */

.chat-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--chat-header-bg);
    border-bottom: 1px solid var(--toolbar-sep-color);
    flex-shrink: 0;
}

.chat-panel__title {
    font-weight: bold;
    font-size: 11pt;
    color: var(--toolbar-fg);
}

.chat-panel__new-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--chat-header-bg);
    color: var(--toolbar-fg);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
    transition: background-color 0.1s;
}

.chat-panel__new-btn:hover {
    background: var(--toolbar-btn-active);
}

/* ── Messages Area ───────────────────────────────────────────────────── */

.chat-panel__messages {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.chat-panel__empty {
    color: var(--dialog-muted-fg);
    font-size: 10pt;
    text-align: center;
    padding: 20px;
}

/* ── Message Bubbles ─────────────────────────────────────────────────── */

.chat-message {
    max-width: 85%;
    padding: 10px;
    border-radius: 12px;
    font-size: 10pt;
    line-height: 1.4;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.chat-message--user {
    align-self: flex-end;
    background: var(--chat-user-bg);
    color: var(--chat-user-fg);
    border-bottom-right-radius: 4px;
}

.chat-message--assistant {
    align-self: flex-start;
    background: var(--chat-assistant-bg);
    color: var(--chat-assistant-fg);
    border-bottom-left-radius: 4px;
}

/* ── Input Area ──────────────────────────────────────────────────────── */

.chat-panel__input-area {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 8px 12px;
    border-top: 1px solid var(--toolbar-sep-color);
    background: var(--chat-panel-bg);
    flex-shrink: 0;
}

.chat-panel__input {
    flex: 1;
    resize: none;
    border: 1px solid var(--toolbar-sep-color);
    border-radius: 8px;
    padding: 8px 12px;
    font-family: var(--font-family);
    font-size: 10pt;
    background: var(--chat-input-bg);
    color: var(--toolbar-fg);
    outline: none;
}

.chat-panel__input:focus {
    border-color: var(--overlay-border);
}

.chat-panel__input:disabled {
    opacity: 0.5;
    cursor: default;
}

.chat-panel__send-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--chat-user-bg);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
    transition: background-color 0.1s;
}

.chat-panel__send-btn:hover {
    background: #004a94;
}

.chat-panel__send-btn:active {
    background: #003d7a;
}

.chat-panel__send-btn:disabled {
    background: #cccccc;
    color: #888888;
    cursor: default;
}