/* ── Reset & base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: var(--tg-theme-bg-color, #ffffff);
    --text: var(--tg-theme-text-color, #000000);
    --hint: var(--tg-theme-hint-color, #999999);
    --link: var(--tg-theme-link-color, #2678b6);
    --btn: var(--tg-theme-button-color, #3390ec);
    --btn-text: var(--tg-theme-button-text-color, #ffffff);
    --secondary-bg: var(--tg-theme-secondary-bg-color, #f0f0f0);
    --header-bg: var(--tg-theme-header-bg-color, var(--btn));
    --radius: 12px;
}

html, body {
    height: 100%; width: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    font-size: 15px;
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
}

#app {
    display: flex;
    height: 100%;
    width: 100%;
}

/* ── Sidebar ────────────────────────────────────────────────── */
#sidebar {
    width: 100%;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    border-right: 1px solid var(--secondary-bg);
    transition: transform .2s;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--header-bg);
    color: var(--btn-text);
}
.sidebar-header h2 { font-size: 18px; font-weight: 600; }
.sidebar-actions { display: flex; gap: 8px; }

.icon-btn {
    background: none; border: none; font-size: 20px; cursor: pointer;
    color: inherit; padding: 4px;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--secondary-bg);
}
.tab {
    flex: 1; padding: 10px; text-align: center;
    background: none; border: none; font-size: 14px;
    cursor: pointer; color: var(--hint);
    border-bottom: 2px solid transparent;
    transition: .15s;
}
.tab.active {
    color: var(--link);
    border-bottom-color: var(--link);
}

.sidebar-search {
    padding: 10px 12px;
    border-bottom: 1px solid var(--secondary-bg);
    background: var(--bg);
}

.sidebar-search input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--secondary-bg);
    border-radius: 999px;
    font-size: 14px;
    outline: none;
    background: var(--secondary-bg);
    color: var(--text);
}

.sidebar-search input::placeholder {
    color: var(--hint);
}

/* User list */
.user-list {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.user-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--secondary-bg);
    transition: background .1s;
}
.user-item:active { background: var(--secondary-bg); }

.user-avatar {
    width: 42px; height: 42px; border-radius: 50%;
    background: var(--btn); color: var(--btn-text);
    display: flex; align-items: center; justify-content: center;
    font-weight: 600; font-size: 18px; flex-shrink: 0;
}

.user-info {
    flex: 1; margin-left: 12px; overflow: hidden;
}
.user-name {
    font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.user-preview {
    font-size: 13px; color: var(--hint);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.badge {
    background: var(--btn); color: var(--btn-text);
    font-size: 12px; font-weight: 600;
    min-width: 22px; height: 22px; border-radius: 11px;
    display: flex; align-items: center; justify-content: center;
    padding: 0 6px; flex-shrink: 0;
}
.badge.hidden { display: none; }

/* ── Chat area ──────────────────────────────────────────────── */
.chat-area {
    width: 100%; display: flex; flex-direction: column;
    position: absolute; top: 0; left: 0; height: 100%;
    background: var(--bg);
    z-index: 10;
}
.chat-area.hidden { display: none; }

.chat-header {
    display: flex; align-items: center; gap: 8px;
    padding: 12px 16px;
    background: var(--header-bg);
    color: var(--btn-text);
    font-weight: 600; font-size: 16px;
}

#chat-username {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chat-menu-btn {
    margin-left: auto;
}

.messages {
    flex: 1; overflow-y: auto; padding: 12px 16px;
    display: flex; flex-direction: column; gap: 6px;
    -webkit-overflow-scrolling: touch;
}

.msg-day-separator {
    align-self: center;
    margin: 8px 0 2px;
}

.msg-day-separator span {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(127, 127, 127, 0.18);
    color: var(--hint);
    font-size: 12px;
    font-weight: 500;
}

.msg {
    max-width: 80%; padding: 8px 12px;
    border-radius: var(--radius); font-size: 14px;
    line-height: 1.4; word-wrap: break-word;
    position: relative;
}
.msg-media {
    display: block;
    width: 100%;
    max-width: 260px;
    border-radius: 10px;
    margin-bottom: 6px;
    background: rgba(0, 0, 0, .08);
}
.msg-file-link {
    color: inherit;
    text-decoration: underline;
}
.msg-text {
    white-space: pre-wrap;
}
.msg .msg-time {
    font-size: 11px; color: var(--hint); margin-top: 2px;
    text-align: right;
}
.msg-in {
    align-self: flex-start;
    background: var(--secondary-bg);
    border-bottom-left-radius: 4px;
}
.msg-out {
    align-self: flex-end;
    background: var(--btn);
    color: var(--btn-text);
    border-bottom-right-radius: 4px;
}
.msg-out .msg-time { color: rgba(255,255,255,.6); }

/* Send form */
.send-form {
    display: flex; gap: 8px;
    padding: 8px 12px;
    border-top: 1px solid var(--secondary-bg);
    background: var(--bg);
}
.send-form input {
    flex: 1; padding: 10px 14px;
    border: 1px solid var(--secondary-bg);
    border-radius: 20px; font-size: 15px;
    outline: none; background: var(--secondary-bg);
    color: var(--text);
}
.send-form button {
    background: var(--btn); color: var(--btn-text);
    border: none; border-radius: 50%;
    width: 40px; height: 40px; font-size: 18px;
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}

/* ── Modals ─────────────────────────────────────────────────── */
.modal {
    position: fixed; inset: 0;
    background: rgba(0,0,0,.45);
    display: flex; align-items: center; justify-content: center;
    z-index: 100;
}
.modal.hidden { display: none; }

.modal-content {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 20px; width: 90%; max-width: 400px;
}
.modal-content-compact {
    max-width: 320px;
}
.modal-content h3 { margin-bottom: 12px; }
.modal-content label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--hint); }
.modal-content textarea {
    width: 100%; padding: 10px; border: 1px solid var(--secondary-bg);
    border-radius: 8px; font-size: 14px; resize: vertical;
    background: var(--secondary-bg); color: var(--text);
}
.modal-content hr { margin: 14px 0; border: none; border-top: 1px solid var(--secondary-bg); }

.modal-actions { display: flex; gap: 8px; margin-top: 12px; }

.btn-primary {
    flex: 1; padding: 10px; border: none; border-radius: 8px;
    background: var(--btn); color: var(--btn-text);
    font-size: 14px; cursor: pointer;
}
.btn-secondary {
    flex: 1; padding: 10px; border: 1px solid var(--secondary-bg); border-radius: 8px;
    background: none; color: var(--text);
    font-size: 14px; cursor: pointer;
}
.btn-danger {
    width: 100%; padding: 10px; border: none; border-radius: 8px;
    background: #e53935; color: #fff;
    font-size: 14px; cursor: pointer;
}

.btn-danger.is-muted {
    background: #2e7d32;
}

.btn-dialog-action {
    margin-top: 10px;
}

.send-form.is-disabled {
    opacity: .65;
}

.send-form.is-disabled input,
.send-form.is-disabled button {
    cursor: not-allowed;
}

/* ── Empty state ────────────────────────────────────────────── */
.empty {
    flex: 1; display: flex; align-items: center; justify-content: center;
    color: var(--hint); font-size: 14px; padding: 40px;
    text-align: center;
}

/* ── Desktop layout (≥600px) ────────────────────────────────── */
@media (min-width: 600px) {
    #sidebar { width: 320px; }
    .chat-area {
        position: relative;
        flex: 1;
    }
    .chat-area.hidden { display: flex; }
    .chat-area.hidden .messages::after {
        content: 'Выберите чат';
        position: absolute; inset: 0;
        display: flex; align-items: center; justify-content: center;
        color: var(--hint); font-size: 16px;
    }
    #btn-back { display: none; }
}