.app-layout {
        display: flex;
        min-height: 100vh;
    }

.app-main {
        flex: 1;
        min-width: 0;
        display: flex;
        flex-direction: column;
    }

.sidebar {
        width: 220px;
        flex-shrink: 0;
        background: var(--surface-alt);
        border-right: 1px solid var(--border);
        padding: 16px 12px;
        display: flex;
        flex-direction: column;
        position: sticky;
        top: 0;
        height: 100vh;
        overflow-y: auto;
        overflow-x: hidden;
        transition: width 0.15s ease;
    }

.sidebar-brand {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 0 8px;
        margin-bottom: 20px;
    }

.sidebar-logo {
        width: 26px;
        height: 26px;
        border-radius: var(--radius-xs);
        background: var(--primary);
        flex-shrink: 0;
        display: flex;
        align-items: center;
        justify-content: center;
    }

.sidebar-logo svg {
        width: 16px;
        height: 16px;
    }

.sidebar-brand-title {
        font-weight: 700;
        font-size: 14px;
        color: var(--text-main);
        white-space: nowrap;
    }

.sidebar-collapse-toggle {
        all: unset;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 24px;
        height: 24px;
        border-radius: var(--radius-xs);
        color: var(--text-muted);
        cursor: pointer;
        margin-left: auto;
        flex-shrink: 0;
    }

.sidebar-collapse-toggle:hover {
        background: var(--border);
        color: var(--primary);
    }

.sidebar-collapse-toggle svg {
        width: 16px;
        height: 16px;
        transition: transform 0.15s ease;
    }

.sidebar-nav {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }

.sidebar-nav-group {
        display: flex;
        flex-direction: column;
    }

.sidebar-nav-label {
        font-size: 11px;
        color: var(--text-muted);
        text-transform: uppercase;
        letter-spacing: 0.04em;
        padding: 0 10px;
        margin-bottom: 6px;
        white-space: nowrap;
    }

.sidebar-nav-link {
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 9px 10px;
        border-radius: var(--radius-sm);
        font-size: 13px;
        color: var(--text-muted);
        text-decoration: none;
        margin-bottom: 2px;
        transition: background 0.15s, color 0.15s;
    }

.sidebar-nav-link:hover {
        background: var(--border);
        text-decoration: none;
    }

.sidebar-nav-link.active {
        background: var(--primary);
        color: #ffffff;
    }

.sidebar-nav-icon {
        width: 18px;
        height: 18px;
        flex-shrink: 0;
    }

.sidebar-nav-text {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

.sidebar-footer {
        margin-top: auto;
        padding-top: 12px;
        border-top: 1px solid var(--border);
    }

.sidebar-user-email {
        font-size: 12px;
        color: var(--text-muted);
        padding: 0 10px;
        margin-bottom: 6px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

.sidebar-logout-form {
        margin: 0;
    }

.sidebar-logout {
        all: unset;
        display: flex;
        align-items: center;
        gap: 10px;
        width: 100%;
        box-sizing: border-box;
        padding: 9px 10px;
        border-radius: var(--radius-sm);
        font-size: 13px;
        color: var(--text-muted);
        cursor: pointer;
    }

.sidebar-logout:hover {
        background: var(--border);
        color: var(--primary);
    }

.sidebar-overlay {
        display: none;
    }

.mobile-topbar {
        display: none;
    }

html.sidebar-collapsed .sidebar {
        width: 68px;
    }

html.sidebar-collapsed .sidebar-brand {
        justify-content: center;
        padding: 0;
    }

html.sidebar-collapsed .sidebar-brand-title,
html.sidebar-collapsed .sidebar-nav-label,
html.sidebar-collapsed .sidebar-nav-text,
html.sidebar-collapsed .sidebar-user-email {
        display: none;
    }

html.sidebar-collapsed .sidebar-collapse-toggle {
        margin-left: 0;
    }

html.sidebar-collapsed .sidebar-collapse-toggle svg {
        transform: rotate(180deg);
    }

html.sidebar-collapsed .sidebar-nav-link,
html.sidebar-collapsed .sidebar-logout {
        justify-content: center;
    }