:root {
    --color-bg: #f6f7fb;
    --color-surface: #ffffff;
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-primary-soft: #eef2ff;
    --color-text: #111827;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;
    --radius-lg: 14px;
    --radius-md: 10px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.05);
    --shadow-md: 0 6px 20px rgba(17, 24, 39, 0.07);
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 0.9375rem;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.01em;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}
a:hover {
    color: var(--color-primary-dark);
}

/* ---- app shell layout ---- */

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

.app-sidebar {
    width: 260px;
    flex: 0 0 260px;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 30;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px;
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--color-text);
}
.sidebar-brand:hover {
    color: var(--color-text);
}

.brand-mark {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    flex: none;
}

.sidebar-nav {
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 8px 12px;
}

.sidebar-section-label {
    text-transform: uppercase;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    padding: 16px 12px 6px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 2px;
}

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

.sidebar-link.active {
    background: var(--color-primary-soft);
    color: var(--color-primary-dark);
    font-weight: 600;
}

.nav-icon {
    width: 18px;
    height: 18px;
    flex: none;
}

.sidebar-footer {
    border-top: 1px solid var(--color-border);
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1 1 auto;
}

.user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--color-primary-soft);
    color: var(--color-primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex: none;
    text-transform: uppercase;
}

.user-email {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-logout {
    color: var(--color-text-muted);
    flex: none;
    display: flex;
}
.sidebar-logout:hover {
    color: var(--color-primary);
}

.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(17, 24, 39, 0.4);
    z-index: 25;
}
.sidebar-backdrop.show {
    display: block;
}

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

.app-topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 14px 28px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.topbar-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 0;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    padding: 4px;
    color: var(--color-text);
}
.sidebar-toggle svg {
    width: 22px;
    height: 22px;
}

.app-content {
    flex: 1 1 auto;
    padding: 28px;
    max-width: 1200px;
    width: 100%;
}

@media (max-width: 991.98px) {
    .app-sidebar {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateX(-100%);
        transition: transform 0.2s ease;
        box-shadow: var(--shadow-md);
    }
    .app-sidebar.open {
        transform: translateX(0);
    }
    .sidebar-toggle {
        display: inline-flex;
        align-items: center;
    }
    .app-content {
        padding: 20px 16px;
    }
    .app-topbar {
        padding: 12px 16px;
    }
}

/* ---- component refinements ---- */

.card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.btn {
    border-radius: var(--radius-sm);
    font-weight: 600;
    padding: 0.5rem 1rem;
}

.btn-sm {
    border-radius: 7px;
}

.btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
}
.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    background: var(--color-primary-dark) !important;
    border-color: var(--color-primary-dark) !important;
}

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

.btn-link {
    font-weight: 500;
}

.form-control, .form-select {
    border-radius: var(--radius-sm);
    border-color: var(--color-border);
    padding: 0.5rem 0.75rem;
}
.form-control:focus, .form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.form-label {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text);
}

.table {
    --bs-table-bg: transparent;
}
.table thead th {
    text-transform: uppercase;
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    font-weight: 700;
    border-bottom-width: 1px;
    border-color: var(--color-border);
}
.table td {
    vertical-align: middle;
    border-color: var(--color-border);
}
.table-hover tbody tr:hover {
    background-color: var(--color-bg);
}

.badge {
    border-radius: 999px;
    font-weight: 600;
    padding: 0.35em 0.7em;
    font-size: 0.72rem;
}
.badge.bg-success { background-color: #dcfce7 !important; color: #15803d; }
.badge.bg-secondary { background-color: #f1f5f9 !important; color: #475569; }
.badge.bg-danger { background-color: #fee2e2 !important; color: #b91c1c; }
.badge.bg-warning { background-color: #fef3c7 !important; color: #92400e; }
.badge.bg-primary-soft { background-color: var(--color-primary-soft) !important; color: var(--color-primary-dark); }

.alert {
    border: none;
    border-radius: var(--radius-md);
}

.nav-tabs {
    border-bottom: 1px solid var(--color-border);
}
.nav-tabs .nav-link {
    border: none;
    color: var(--color-text-muted);
    font-weight: 600;
    padding: 0.5rem 0.25rem;
    margin-right: 1.25rem;
    border-radius: 0;
}
.nav-tabs .nav-link.active {
    color: var(--color-primary);
    background: none;
    border-bottom: 2px solid var(--color-primary);
}

.modal-content {
    border: none;
    border-radius: var(--radius-lg);
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 800;
}

.progress {
    height: 1.25rem;
    border-radius: 999px;
    background-color: var(--color-bg);
}
.progress-bar {
    background-color: var(--color-primary);
}

#template-preview {
    width: 100%;
    height: 600px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: #fff;
}