:root {
    /* Colors — aligned with Gar OS warm palette */
    --amber: #c4956a;
    --amber-glow: rgba(196, 149, 106, 0.1);
    --amber-dim: #9e7852;

    --gold: #b8a070;
    --gold-dim: #8c7a56;

    --bg-0: #17140f;
    --bg-1: #1e1a14;
    --bg-2: #262117;
    --bg-3: #322b21;
    --bg-4: #3d352a;
    --bg-hover: #2e2820;

    --text-0: #f8f4f0;
    --text-1: #e8e2da;
    --text-2: #ccc4b8;
    --text-3: #a89e90;

    --border: #322b21;
    --border-light: #3d352a;

    --error: #c47a6a;
    --success: #7aaa8a;
    --info: #7a9ab0;
    --purple: #a08ac4;
    --purple-glow: rgba(160, 138, 196, 0.15);

    /* Typography */
    --font-sans: 'Söhne', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-mono: 'Söhne Mono', 'Fira Code', ui-monospace, 'Cascadia Code', monospace;

    /* Spacing */
    --sp-xs: 4px;
    --sp-sm: 8px;
    --sp-md: 16px;
    --sp-lg: 24px;
    --sp-xl: 32px;

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg-0);
    color: var(--text-1);
    font-family: var(--font-sans);
    font-size: 13px;
    line-height: 1.5;
    letter-spacing: -0.01em;
    height: 100vh;
    overflow: hidden;
}

#shell {
    display: flex;
    height: 100vh;
}

/* Sidebar */
#sidebar {
    width: 220px;
    min-width: 220px;
    background: var(--bg-1);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-header {
    padding: var(--sp-md);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: var(--sp-sm);
}

.sidebar-header .logo {
    font-size: 22px;
    color: var(--amber);
}

.sidebar-header .title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-0);
    letter-spacing: 0.02em;
}

.sidebar-section {
    padding: var(--sp-sm) 0;
}

.sidebar-label {
    padding: var(--sp-xs) var(--sp-md);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-3);
    font-weight: 600;
}

.sidebar-item {
    padding: var(--sp-sm) var(--sp-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--sp-sm);
    color: var(--text-2);
    font-size: 13px;
    transition: background 0.15s, color 0.15s;
    border-left: 3px solid transparent;
}

.sidebar-item:hover {
    background: var(--bg-hover);
    color: var(--text-1);
}

.sidebar-item.active {
    background: var(--amber-glow);
    color: var(--amber);
    border-left-color: var(--amber);
}

.sidebar-item .icon {
    font-size: 15px;
    width: 22px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-item .icon svg {
    display: block;
}

/* Content area */
#content {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

#ext-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--sp-lg);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bg-3);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-3);
}

/* Mobile: sidebar hidden by default, slides in */
@media (max-width: 768px) {
    #sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        z-index: 300;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
    }

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

    #sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 299;
    }

    #sidebar-overlay.open {
        display: block;
    }

    #ext-container {
        padding: var(--sp-sm);
    }

}