/* ============================================================
   sidebar.css — Left sidebar, brand row, nav buttons, settings
   ============================================================ */

.sidebar {
    width: var(--sidebar-w);
    border-right: 1px solid var(--line);
    background: var(--sidebar-bg);
    backdrop-filter: blur(8px);
    padding: 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    border: none;
    border-radius: 0;
    padding: 0;
    background: transparent;
    margin-bottom: 0.15rem;
}
.brand img {
    width: auto;
    height: 26px;
    display: block;
    flex-shrink: 0;
}

.sidebar-icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--sidebar-icon-color);
    border-radius: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    opacity: 0.9;
}
.sidebar-icon-btn:hover { background: transparent; opacity: 1; color: var(--text); }
.sidebar-icon-btn svg { width: 22px; height: 22px; }

.side-head {
    margin-top: 0.9rem;
    margin-bottom: 0.45rem;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--muted);
    text-transform: uppercase;
}
.side-nav { display: grid; gap: 0.35rem; }
.side-nav-secondary { margin-bottom: 0.7rem; }

.side-divider {
    height: 1px;
    background: var(--sidebar-divider);
    margin: 0.35rem 0 0.25rem;
}
.side-subhead {
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--sidebar-subhead);
    margin: 0.1rem 0 0.25rem;
}

.side-btn {
    text-align: left;
    border: 1px solid transparent;
    border-radius: 9px;
    padding: 0.46rem 0.56rem;
    color: var(--muted);
    background: transparent;
    text-decoration: none;
    font-size: 0.86rem;
    cursor: pointer;
}
.side-btn:hover, .side-btn.active {
    color: var(--text);
    border-color: var(--line);
    background: var(--sidebar-btn-hover-bg);
}

.sidebar-spacer { flex: 1; }

/* Session history list */
.session-history {
    display: grid;
    gap: 0.25rem;
    margin-top: 0.35rem;
    max-height: 220px;
    overflow-y: auto;
    scrollbar-width: none;
}
.session-history::-webkit-scrollbar { display: none; }
.session-history .session-item {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.82rem;
    padding: 0.38rem 0.56rem;
}

/* Settings section */
.settings-wrap {
    position: relative;
    border-top: 1px solid var(--line);
    padding-top: 0.72rem;
    margin-top: 0.2rem;
}
.settings-actions { display: grid; gap: 0.42rem; }
.settings-actions .side-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 500;
    border-color: var(--sidebar-action-border);
    background: var(--sidebar-action-bg);
    color: var(--sidebar-action-color);
    padding: 0.54rem 0.64rem;
    transition: background 0.16s ease, border-color 0.16s ease, transform 0.16s ease, color 0.16s ease;
}
.settings-actions .side-btn:hover {
    background: var(--sidebar-action-hover-bg);
    border-color: var(--sidebar-action-hover-border);
    color: var(--sidebar-action-hover-color);
    transform: translateY(-1px);
}
.settings-actions .side-btn.secondary {
    background: var(--sidebar-action-sec-bg);
    color: var(--sidebar-action-sec-color);
}
.settings-panel {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 5.1rem;
    border: 1px solid var(--line);
    background: var(--settings-panel-bg);
    border-radius: 10px;
    padding: 0.72rem;
    display: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
.settings-panel.show { display: block; }
.settings-panel p {
    font-size: 0.8rem;
    color: var(--muted);
    line-height: 1.4;
    margin-bottom: 0.32rem;
}
.settings-panel p:last-child { margin-bottom: 0; }

/* Collapsed sidebar button lives in topbar, hidden by default */
.collapsed-sidebar-btn {
    display: none;
    flex-shrink: 0;
}
.layout.sidebar-collapsed .collapsed-sidebar-btn { display: inline-flex; }

@media (max-width: 1000px) {
    .sidebar { display: none; }
    .collapsed-sidebar-btn { display: none !important; }
}