:root {
    --mobile-header-height: 3rem;
}

.app-container {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: clamp(1rem, 3vw, 3rem);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 100;
    transition:
        width var(--transition-normal),
        padding var(--transition-normal),
        transform var(--transition-normal);
}

.brand-logo {
    font-size: 1.3125rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    margin-bottom: 0;
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    text-decoration: none;
    line-height: 1.1;
}

.brand-logo__image,
.brand-logo__icon {
    display: block;
    width: auto;
    height: 2rem;
    object-fit: contain;
    flex-shrink: 0;
}

.brand-logo__text {
    display: block;
    line-height: 1.1;
}

.sidebar .brand-logo {
    font-size: clamp(1.125rem, 1.5vw, 1.4rem);
    margin-bottom: clamp(1rem, 2vw, 2.5rem);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0;
    line-height: 1.2;
}

.sidebar .brand-logo__image,
.sidebar .brand-logo__icon {
    height: clamp(2.75rem, 7vw, 3.5rem);
    max-width: 100%;
    margin-bottom: 0.625rem;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.nav-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    transition: all 0.2s ease;
}

.nav-btn:hover {
    color: var(--color-primary);
    background-color: var(--color-hover);
}

.nav-btn.active {
    background-color: var(--color-hover);
    color: var(--color-primary);
}

.nav-btn .chevron-icon {
    transition: transform 0.2s ease;
}

.nav-btn.active .chevron-icon {
    transform: rotate(90deg);
}

.sub-menu {
    margin-left: 0.75rem;
    margin-top: 0.25rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.sub-nav-btn {
    width: 100%;
    text-align: left;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    transition: all 0.2s;
}

.sub-nav-btn:hover {
    color: var(--color-text-main);
    background-color: rgba(0, 0, 0, 0.03);
}

.sub-nav-btn.active-sub {
    background-color: var(--color-hover);
    color: var(--color-accent);
    font-weight: 600;
}

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

.mobile-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-height: 3rem;
    padding: 0.625rem 1rem;
    padding-top: max(0.625rem, env(safe-area-inset-top, 0px));
    padding-left: max(1rem, env(safe-area-inset-left, 0px));
    padding-right: max(1rem, env(safe-area-inset-right, 0px));
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.mobile-header .brand-logo {
    margin-bottom: 0;
    font-size: clamp(1.125rem, 4.5vw, 1.35rem);
    line-height: 1;
    white-space: nowrap;
}

.menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    margin: 0;
    border-radius: 0.375rem;
    color: var(--color-text-main);
    flex-shrink: 0;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.menu-toggle:hover {
    background-color: var(--color-hover);
    color: var(--color-primary);
}

.menu-toggle .icon {
    width: 1.25rem;
    height: 1.25rem;
}

.sidebar.sidebar-closed {
    width: 0 !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
    border-right: none !important;
}
.sidebar.sidebar-open {
    width: var(--sidebar-width) !important;
}

.sidebar-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    margin-right: 8px;
    border-radius: 6px;
    color: var(--color-text-muted);
    transition:
        background-color 0.2s,
        color 0.2s;
}

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

@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        top: var(--mobile-header-height);
        left: 0;
        bottom: 0;
        height: calc(100dvh - var(--mobile-header-height));
        z-index: 1000;
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.1);
        transform: translateX(-100%);
        width: min(var(--sidebar-width), 85vw) !important;
        padding: 0.75rem 1rem !important;
        padding-bottom: max(0.75rem, env(safe-area-inset-bottom, 0px)) !important;
        padding-left: max(1rem, env(safe-area-inset-left, 0px)) !important;
        padding-right: 1rem !important;
    }

    .sidebar .brand-logo {
        display: none;
    }

    .sidebar .nav-menu {
        margin-top: 0;
    }

    .sidebar .nav-btn {
        padding: 0.625rem 0.5rem;
        font-size: clamp(0.8125rem, 3.2vw, 0.9rem);
    }

    .sidebar .sub-nav-btn {
        padding: 0.4375rem 0.625rem;
        font-size: clamp(0.75rem, 2.8vw, 0.8125rem);
    }

    .sidebar.sidebar-closed {
        transform: translateX(-100%);
    }

    .sidebar.sidebar-open {
        transform: translateX(0);
    }

    .mobile-header {
        display: flex;
        position: sticky;
        top: 0;
        z-index: 1001;
    }

    .sidebar-toggle {
        display: none !important;
    }

    .main-content {
        width: 100%;
        min-width: 0;
    }
}

@media (max-width: 480px) {
    :root {
        --mobile-header-height: 2.75rem;
    }

    .mobile-header {
        min-height: 2.75rem;
        padding: 0.5rem 0.75rem;
        padding-top: max(0.5rem, env(safe-area-inset-top, 0px));
        padding-left: max(0.75rem, env(safe-area-inset-left, 0px));
        padding-right: max(0.75rem, env(safe-area-inset-right, 0px));
    }

    .mobile-header .brand-logo {
        font-size: 1.125rem;
    }

    .menu-toggle {
        width: 2rem;
        height: 2rem;
    }

    .menu-toggle .icon {
        width: 1.125rem;
        height: 1.125rem;
    }

    .sidebar {
        width: min(16rem, 88vw) !important;
        padding: 0.625rem 0.75rem !important;
        padding-left: max(0.75rem, env(safe-area-inset-left, 0px)) !important;
    }
}

@media (min-width: 1025px) {
    .sidebar {
        padding-top: clamp(1rem, 3vw, 3rem);
    }
}