:root {
    --primary-color: #0066cc;
    --primary-hover: #0052a3;
    --text-color: #1a1a2e;
    --text-muted: #666;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --border-color: #e1e5eb;
    --error-color: #cc0000;
    --warning-color: #cc6600;
    --success-color: #008800;
    --sidebar-width: 240px;
}

*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-color);
    background: var(--bg-color);
}

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

.sidebar {
    width: var(--sidebar-width);
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.sidebar-nav .nav-link {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    color: var(--text-color);
    text-decoration: none;
    transition: background 0.15s;
}

.sidebar-nav .nav-link:hover {
    background: var(--bg-color);
}

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

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.user-info {
    margin-bottom: 0.75rem;
}

.user-name {
    display: block;
    font-weight: 500;
}

.tenant-badge {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.logout-form {
    margin: 0;
}

.logout-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    font-size: 0.9rem;
}

.logout-btn:hover {
    background: var(--bg-color);
}

.main-content {
    flex: 1;
    min-height: 100vh;
}

.main-content.with-sidebar {
    margin-left: var(--sidebar-width);
}

.content-wrapper {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Public header */
.public-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s;
    text-align: center;
}

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

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

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-color);
}

.btn-danger {
    background: var(--error-color);
    color: white;
}

.btn-danger:hover {
    background: #aa0000;
}

/* Form controls */
.form-control {
    display: block;
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

.form-control:disabled {
    background: var(--bg-color);
    color: var(--text-muted);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.alert-success {
    background: #e6f9e6;
    border: 1px solid #b3e6b3;
    color: var(--success-color);
}

.alert-error {
    background: #ffe6e6;
    border: 1px solid #ffb3b3;
    color: var(--error-color);
}

.alert-warning {
    background: #fff3e6;
    border: 1px solid #ffd9b3;
    color: var(--warning-color);
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    padding: 1.5rem;
}

/* Text utilities */
.text-muted { color: var(--text-muted); }
.text-error { color: var(--error-color); }
.text-success { color: var(--success-color); }

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }

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

    .main-content.with-sidebar {
        margin-left: 0;
    }

    .content-wrapper {
        padding: 1rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}