/* =====================================================================
   Внутрішній чат
   ===================================================================== */

.chat-drawer {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: min(440px, 100%);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    background: var(--glass-strong);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border-left: 1px solid var(--line-strong);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform var(--slow) var(--ease), visibility 0s linear var(--slow);
}
.chat-drawer.is-open {
    transform: none;
    visibility: visible;
    transition: transform var(--slow) var(--ease), visibility 0s;
}

.chat-drawer__head {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
    flex-shrink: 0;
}
.chat-drawer__title { font-size: var(--t-md); font-weight: 550; }
.chat-drawer__context { font-size: var(--t-sm); color: var(--text-muted); }

.chat-messages {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.msg {
    max-width: 84%;
    padding: 10px 13px;
    border-radius: var(--r-lg);
    font-size: var(--t-base);
    line-height: 1.55;
    border: 1px solid var(--line);
    background: var(--bg-raised);
    color: var(--text-soft);
    align-self: flex-start;
    animation: msg-in var(--normal) var(--ease-out);
}
.msg--own {
    align-self: flex-end;
    background: var(--accent-soft);
    border-color: var(--accent-line);
    color: var(--text);
}
.msg__author {
    font-size: var(--t-xs);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 4px;
}
.msg__time {
    display: block;
    margin-top: 5px;
    font-size: var(--t-xs);
    color: var(--text-faint);
}
.msg__file {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    padding: 8px 10px;
    border: 1px solid var(--line-strong);
    border-radius: var(--r-sm);
    background: var(--tint-soft);
    font-size: var(--t-sm);
    color: var(--text);
}
.msg__file svg { width: 14px; height: 14px; flex-shrink: 0; color: var(--text-muted); }
.msg__file span { color: var(--text-muted); }

@keyframes msg-in {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: none; }
}

.chat-form {
    flex-shrink: 0;
    padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px));
    border-top: 1px solid var(--line);
    background: var(--glass);
}
.chat-form__row { display: flex; gap: 8px; align-items: flex-end; }
.chat-form textarea {
    flex: 1;
    min-height: 40px;
    max-height: 140px;
    resize: none;
    padding: 9px 12px;
    border: 1px solid var(--line-strong);
    border-radius: var(--r-md);
    background: var(--bg-inset);
    color: var(--text);
    font-size: var(--t-base);
    line-height: 1.5;
}
.chat-form textarea:focus { outline: none; border-color: var(--accent-line); }
.chat-form__file {
    font-size: var(--t-sm);
    color: var(--text-muted);
    margin-top: 8px;
    display: none;
    align-items: center;
    gap: 6px;
}
.chat-form__file.is-visible { display: flex; }
.chat-form__hint { font-size: var(--t-xs); color: var(--text-faint); margin-top: 8px; }

.chat-backdrop {
    position: fixed;
    inset: 0;
    background: var(--overlay);
    backdrop-filter: blur(2px);
    z-index: calc(var(--z-modal) - 1);
    animation: fade-in var(--fast) var(--ease);
}

@media (max-width: 640px) {
    .chat-drawer { width: 100%; border-left: none; }
}