:root {
    --bg: #1a1a1a;
    --bg-card: #242424;
    --bg-hover: #2a2a2a;
    --bg-sidebar: #1e1e1e;
    --text: #e0e0e0;
    --text-muted: #888;
    --accent: #7C5CFF;
    --accent-dim: #5B3FE8;
    --danger: #ff4444;
    --warning: #ffaa00;
    --border: #333;
    --bg-secondary: #202020;
    --text-dim: #666;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}
.sidebar-brand {
    padding: 1.2rem 1.5rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
    border-bottom: 1px solid var(--border);
}
.sidebar-tenant {
    padding: 0.8rem 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}
.sidebar-nav {
    flex: 1;
    padding: 0.5rem 0;
    overflow-y: auto;
}
.nav-section {
    padding: 0.8rem 1.5rem 0.3rem;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.55rem 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    transition: all 0.15s;
    text-decoration: none;
}
.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text);
    text-decoration: none;
}
.nav-item.active {
    color: var(--accent);
    background: rgba(124, 92, 255, 0.08);
    border-right: 2px solid var(--accent);
}
.nav-icon { font-size: 1rem; width: 20px; text-align: center; }
.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
}
.sidebar-footer a {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Main content */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 2rem;
    max-width: 1100px;
}
.page-header {
    margin-bottom: 1.5rem;
}
.page-header h1 {
    font-size: 1.4rem;
    font-weight: 600;
}
.page-header p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 0.3rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.card h2 { font-size: 1.1rem; margin-bottom: 1rem; }

/* Grid layouts */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}
.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--bg);
    border-radius: 8px;
}
.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
}
.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
}
.btn-primary { background: var(--accent); color: #000; }
.btn-primary:hover { background: var(--accent-dim); text-decoration: none; }
.btn-secondary { background: var(--bg-hover); color: var(--text); border: 1px solid var(--border); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 0.4rem 0.8rem; font-size: 0.8rem; }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 0.6rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 0.9rem;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent);
}

/* Alerts */
.alert {
    padding: 0.8rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}
.alert-error { background: #3a1111; border: 1px solid var(--danger); color: #ff8888; }
.alert-success { background: rgba(124, 92, 255, 0.1); border: 1px solid var(--accent); color: var(--accent); }
.alert-warning { background: #2a2200; border: 1px solid var(--warning); color: var(--warning); }

/* Profile */
.profile-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}
.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 2px solid var(--accent);
}
.profile-info h1 { font-size: 1.3rem; }
.profile-info p { color: var(--text-muted); font-size: 0.9rem; }

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
}
.table th, .table td {
    padding: 0.7rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
}
.table th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
}
.table tr:hover { background: var(--bg-hover); }

/* Badge */
.badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}
.badge-success { background: rgba(124, 92, 255, 0.18); color: var(--accent); }
.badge-warning { background: rgba(255, 170, 0, 0.15); color: var(--warning); }
.badge-danger { background: rgba(255, 68, 68, 0.15); color: var(--danger); }
.badge-muted { background: rgba(136, 136, 136, 0.15); color: var(--text-muted); }


/* ===== Mobile collapsible sidebar ===== */
.mobile-topbar { display: none; }
.sidebar-overlay { display: none; }

@media (max-width: 768px) {
    .mobile-topbar {
        display: flex;
        align-items: center;
        gap: 0.8rem;
        position: fixed;
        top: 0; left: 0; right: 0;
        height: 52px;
        padding: 0 1rem;
        background: var(--bg-sidebar);
        border-bottom: 1px solid var(--border);
        z-index: 120;
    }
    .sidebar-toggle {
        background: transparent;
        border: 1px solid var(--border);
        color: var(--text);
        font-size: 1.2rem;
        line-height: 1;
        width: 38px; height: 38px;
        border-radius: 8px;
        cursor: pointer;
        display: flex; align-items: center; justify-content: center;
    }
    .mobile-topbar-brand { font-weight: 700; color: var(--accent); font-size: 1.05rem; }

    /* Sidebar off-canvas */
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        width: 260px;
        box-shadow: 2px 0 18px rgba(0,0,0,0.35);
    }
    body.sidebar-open .sidebar { transform: translateX(0); }

    /* Overlay */
    .sidebar-overlay {
        position: fixed; inset: 0;
        background: rgba(0,0,0,0.5);
        z-index: 110;
        opacity: 0; pointer-events: none;
        transition: opacity 0.25s ease;
    }
    body.sidebar-open .sidebar-overlay { display: block; opacity: 1; pointer-events: auto; }

    /* Main content takes full width, pushed below topbar */
    .main-content {
        margin-left: 0;
        padding: 1.2rem 1rem;
        padding-top: calc(52px + 1.2rem);
        max-width: 100%;
    }
    .sidebar { z-index: 115; }
}


/* ===== Light theme ===== */
:root[data-theme="light"] {
    --bg: #f6f7f9;
    --bg-card: #ffffff;
    --bg-hover: #eef0f3;
    --bg-sidebar: #ffffff;
    --bg-secondary: #f0f1f4;
    --text: #1a1a1f;
    --text-muted: #6b7280;
    --text-dim: #9aa0a8;
    --accent: #7C5CFF;
    --accent-dim: #5B3FE8;
    --danger: #dc2626;
    --warning: #d97706;
    --border: #e3e6ea;
}

.theme-toggle-btn {
    background: var(--bg-hover); border: 1px solid var(--border); color: var(--text-muted);
    padding: 0.4rem 0.7rem; border-radius: 6px; cursor: pointer; font-size: 0.8rem;
    font-family: inherit; display: inline-flex; align-items: center; gap: 0.4rem; width: 100%;
    justify-content: center; transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle-btn:hover { color: var(--text); border-color: var(--accent); }