:root {
    --c-primary: #2563EB;
    --c-primary-hover: #1D4ED8;
    --c-secondary: #64748B;
    --c-accent: #F97316;
    --c-accent-hover: #EA580C;
    --c-success: #16A34A;
    --c-success-hover: #15803D;
    --c-danger: #DC2626;
    --c-danger-hover: #B91C1C;
    --c-warning: #D97706;
    --c-bg: #F1F5F9;
    --c-surface: #FFFFFF;
    --c-text: #1E293B;
    --c-text-secondary: #64748B;
    --c-border: #E2E8F0;
    --c-navbar: #1E293B;
    --radius-card: 14px;
    --radius-btn: 8px;
    --radius-input: 8px;
    --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.06);
    --shadow-card-hover: 0 2px 8px rgba(0,0,0,0.08), 0 8px 24px rgba(0,0,0,0.08);
    --font-ui: 'Fira Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Fira Code', 'SF Mono', 'Consolas', monospace;
    --transition: 200ms ease;
}

*, *::before, *::after { touch-action: manipulation; }

body.app-body {
    font-family: var(--font-ui);
    background-color: var(--c-bg);
    color: var(--c-text);
    -webkit-font-smoothing: antialiased;
}

.app-navbar { background: var(--c-navbar); box-shadow: 0 1px 4px rgba(0,0,0,0.15); }
.app-navbar .navbar-brand { font-weight: 700; color: #fff; font-size: 1.15rem; letter-spacing: 0.3px; }
.brand-icon { color: var(--c-accent); margin-right: 2px; }
.app-navbar .nav-link { color: rgba(255,255,255,0.75); font-weight: 500; font-size: 0.9rem; padding: 0.5rem 0.85rem; border-radius: var(--radius-btn); transition: color var(--transition), background var(--transition); }
.app-navbar .nav-link:hover { color: #fff; background: rgba(255,255,255,0.08); }
.app-navbar .nav-link.active { color: #fff; background: rgba(255,255,255,0.12); position: relative; }
.app-navbar .nav-link.active::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 24px; height: 2px; background: var(--c-accent); border-radius: 2px; }
.navbar-user { display: flex; align-items: center; gap: 0.75rem; }
.navbar-user__name { color: rgba(255,255,255,0.7); font-size: 0.85rem; font-weight: 400; }
.app-navbar .navbar-toggler {
    border: 1px solid rgba(255,255,255,0.3);
    padding: 0.4rem 0.55rem;
}
.app-navbar .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255,255,255,0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    width: 1.25em;
    height: 1.25em;
}

.panel-card { border: 0; border-radius: var(--radius-card); box-shadow: var(--shadow-card); background: var(--c-surface); transition: box-shadow var(--transition); }
.panel-card:hover { box-shadow: var(--shadow-card-hover); }
.panel-card .card-body { padding: 1.25rem; }

.table-wrap { background: var(--c-surface); border-radius: var(--radius-card); box-shadow: var(--shadow-card); padding: 0.25rem 0.5rem; }

.mobile-list-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 12px; padding: 0.85rem; margin-bottom: 0.6rem; transition: box-shadow var(--transition); }
.mobile-list-card:hover { box-shadow: var(--shadow-card-hover); }
.mobile-list-card__name { font-weight: 600; margin-bottom: 0.3rem; color: var(--c-text); }

h1, h2, h3, h4, h5, h6 { font-family: var(--font-ui); font-weight: 600; color: var(--c-text); }
h2 { font-size: 1.5rem; }
h4 { font-size: 1.15rem; }
h5 { font-size: 1rem; }
.text-muted { color: var(--c-text-secondary) !important; }
.price, .num, .badge { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.form-control, .form-select { border-radius: var(--radius-input); border: 1px solid var(--c-border); font-size: 0.9rem; transition: border-color var(--transition), box-shadow var(--transition); }
.form-control:focus, .form-select:focus { border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }
.form-label { font-weight: 500; font-size: 0.85rem; color: var(--c-text-secondary); margin-bottom: 0.3rem; }
input[type="number"] { appearance: textfield; -moz-appearance: textfield; font-family: var(--font-mono); }
input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.btn { border-radius: var(--radius-btn); font-weight: 500; font-size: 0.9rem; transition: all var(--transition); cursor: pointer; }
.btn-primary { background: var(--c-primary); border-color: var(--c-primary); }
.btn-primary:hover, .btn-primary:focus { background: var(--c-primary-hover); border-color: var(--c-primary-hover); }
.btn-success { background: var(--c-success); border-color: var(--c-success); }
.btn-success:hover, .btn-success:focus { background: var(--c-success-hover); border-color: var(--c-success-hover); }
.btn-danger { background: var(--c-danger); border-color: var(--c-danger); }
.btn-danger:hover, .btn-danger:focus { background: var(--c-danger-hover); border-color: var(--c-danger-hover); }
.btn-warning { background: var(--c-warning); border-color: var(--c-warning); color: #fff; }
.btn-warning:hover, .btn-warning:focus { background: #B45309; border-color: #B45309; color: #fff; }
.btn-outline-primary { color: var(--c-primary); border-color: var(--c-primary); }
.btn-outline-primary:hover { background: var(--c-primary); color: #fff; }
.btn-outline-secondary { color: var(--c-secondary); border-color: var(--c-border); }
.btn-outline-secondary:hover { background: var(--c-bg); color: var(--c-text); }
.btn-info { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.btn-info:hover { background: var(--c-primary-hover); border-color: var(--c-primary-hover); color: #fff; }

.alert { border: 0; border-radius: var(--radius-btn); font-size: 0.9rem; border-left: 4px solid; }
.alert-success { border-left-color: var(--c-success); background: #F0FDF4; color: #166534; }
.alert-danger { border-left-color: var(--c-danger); background: #FEF2F2; color: #991B1B; }
.alert-warning { border-left-color: var(--c-warning); background: #FFFBEB; color: #92400E; }
.alert-info { border-left-color: var(--c-primary); background: #EFF6FF; color: #1E40AF; }

.table { font-size: 0.9rem; }
.table thead th { font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.5px; color: var(--c-text-secondary); border-bottom: 2px solid var(--c-border); }
.table td { vertical-align: middle; color: var(--c-text); }

.empty-state { text-align: center; padding: 3rem 1.5rem; color: var(--c-text-secondary); }
.empty-state__icon { font-size: 2.5rem; margin-bottom: 0.75rem; opacity: 0.4; }
.empty-state__text { font-size: 1rem; margin-bottom: 0.5rem; }
.empty-state__hint { font-size: 0.85rem; opacity: 0.7; }

.badge { font-weight: 500; font-size: 0.8rem; border-radius: 6px; padding: 0.35em 0.65em; }

details summary { cursor: pointer; user-select: none; padding: 0.5rem 0; }
details[open] summary { margin-bottom: 0.25rem; }

/* Action button groups */
.mobile-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.mobile-actions form { display: inline; }

@media (max-width: 767.98px) {
    .container-md { max-width: 100%; }
    .app-navbar .nav-link { padding: 0.75rem 0; border-bottom: 1px solid rgba(255,255,255,0.06); border-radius: 0; }
    .app-navbar .nav-link.active::after { display: none; }
    .app-navbar .nav-link.active { background: rgba(255,255,255,0.08); }
    .navbar-user { padding: 0.5rem 0; border-top: 1px solid rgba(255,255,255,0.08); margin-top: 0.5rem; }
    .form-control, .form-select, .btn { min-height: 44px; }
    .btn-sm { min-height: 36px; }
    .mobile-actions .btn { width: 100%; margin-bottom: 0.5rem; }
    .table-wrap { padding: 0.25rem; }
    h2 { font-size: 1.3rem; }
}

@media (min-width: 768px) {
    .panel-card .card-body { padding: 1.5rem; }
}