/* ==========================================================================
   আলফা স্টোর (Alfa Store) — প্রিমিয়াম বাংলা ই-কমার্স ও পিওএস স্টাইলশিট
   মোবাইল-ফার্স্ট রেসপনসিভ, ডার্ক মোড সমর্থিত, বাজেট অ্যান্ড্রয়েড ও মোবাইল নেটওয়ার্ক অপ্টিমাইজড
   ========================================================================== */

:root {
    --bg-primary: #f8fafc;
    --bg-surface: #ffffff;
    --bg-elevated: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --brand-navy: #1e1b4b;
    --brand-violet: #4f46e5;
    --brand-violet-hover: #4338ca;
    --brand-accent: #7c3aed;
    --border-color: #e2e8f0;
    --success-bg: #ecfdf5;
    --success-text: #065f46;
    --warning-bg: #fffbeb;
    --warning-text: #92400e;
    --danger-bg: #fef2f2;
    --danger-text: #991b1b;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 14px rgba(30, 27, 75, 0.08);
    --font-bn: 'Hind Siliguri', 'Noto Sans Bengali', 'SolaimanLipi', 'Kalpurush', sans-serif;
}

[data-theme="dark"] {
    --bg-primary: #0b0f19;
    --bg-surface: #111827;
    --bg-elevated: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --brand-navy: #e0e7ff;
    --brand-violet: #6366f1;
    --brand-violet-hover: #818cf8;
    --border-color: #1f2937;
    --success-bg: rgba(16, 185, 129, 0.15);
    --success-text: #6ee7b7;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --warning-text: #fcd34d;
    --danger-bg: rgba(239, 68, 68, 0.15);
    --danger-text: #fca5a5;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-bn);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--brand-violet);
    text-decoration: none;
    transition: color 0.18s ease;
}

a:hover {
    color: var(--brand-violet-hover);
}

.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header & Bangla Navigation */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    min-height: 68px;
    flex-wrap: wrap;
    padding: 8px 0;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--brand-navy);
}

.search-bar-form {
    flex: 1 1 260px;
    max-width: 440px;
    display: flex;
    gap: 6px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.nav-link {
    padding: 7px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: background-color 0.18s ease;
}

.nav-link:hover, .nav-link.active {
    background: var(--bg-elevated);
    color: var(--brand-violet);
}

.badge-counter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    border-radius: 999px;
    background: var(--brand-violet);
    color: #ffffff;
    font-size: 0.8rem;
    font-weight: 700;
    margin-left: 4px;
    transition: transform 0.2s ease;
}

.badge-counter.pulse {
    transform: scale(1.22);
}

/* Buttons & Forms */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    font-family: var(--font-bn);
    font-size: 0.95rem;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color 0.18s ease, transform 0.12s ease;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: var(--brand-violet);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--brand-violet-hover);
    color: #ffffff;
}

.btn-outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--brand-violet);
    color: var(--brand-violet);
}

.btn-danger {
    background: #dc2626;
    color: #ffffff;
}

.btn-sm {
    padding: 5px 11px;
    font-size: 0.85rem;
}

.form-group {
    margin-bottom: 14px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-family: var(--font-bn);
    font-size: 0.95rem;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: 2px solid var(--brand-violet);
    border-color: transparent;
}

/* Grid & Cards */
.grid {
    display: grid;
    gap: 18px;
}

.grid-products {
    grid-template-columns: repeat(auto-fill, minmax(265px, 1fr));
}

.grid-kpi {
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
}

.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.product-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.product-type-tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--bg-elevated);
    color: var(--brand-violet);
}

.price-current {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--brand-violet);
}

.price-old {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: line-through;
    margin-left: 6px;
}

/* Dashboard Sidebar + Content Layout */
.panel-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 24px 0;
}

@media (min-width: 900px) {
    .panel-layout {
        grid-template-columns: 260px 1fr;
    }
}

.sidebar-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sidebar-menu li {
    margin-bottom: 4px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: 600;
}

.sidebar-menu a:hover, .sidebar-menu a.active {
    background: var(--brand-violet);
    color: #ffffff;
}

/* Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th, .table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
    font-size: 0.92rem;
}

.table th {
    background: var(--bg-elevated);
    font-weight: 700;
    color: var(--text-primary);
}

/* Alerts & Toast */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-weight: 600;
}

.alert-success { background: var(--success-bg); color: var(--success-text); }
.alert-warning { background: var(--warning-bg); color: var(--warning-text); }
.alert-danger  { background: var(--danger-bg);  color: var(--danger-text); }

.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast-item {
    background: var(--brand-navy);
    color: #ffffff;
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-weight: 600;
}

/* Skeleton Loader & Empty States */
.skeleton {
    background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--border-color) 50%, var(--bg-elevated) 75%);
    background-size: 200% 100%;
    animation: alfaShimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

@keyframes alfaShimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.empty-state {
    text-align: center;
    padding: 36px 20px;
    color: var(--text-secondary);
}