/* ============================================================
   Mixin Inventory — Style Sheet (Complete)
   ============================================================ */

/* ==== ریست ==== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* ==== متغیرهای رنگ و اندازه ==== */
:root {
    --primary:        #2563eb;
    --primary-dark:   #1d4ed8;
    --primary-light:  #eff6ff;

    --success:        #16a34a;
    --success-dark:   #15803d;
    --success-light:  #f0fdf4;

    --danger:         #dc2626;
    --danger-dark:    #b91c1c;
    --danger-light:   #fef2f2;

    --warning:        #d97706;
    --warning-light:  #fffbeb;

    --info:           #0284c7;
    --info-light:     #f0f9ff;

    --gray-50:  #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --radius:     10px;
    --radius-lg:  14px;
    --radius-sm:  6px;

    --shadow:     0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md:  0 4px 12px rgba(0,0,0,.08);
    --shadow-lg:  0 10px 25px rgba(0,0,0,.1);

    --transition: all .15s ease;
}

/* ==== پایه ==== */
html, body {
    height: 100%;
}

body {
    font-family: 'Vazirmatn', 'Segoe UI', Tahoma, Arial, sans-serif;
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.7;
    direction: rtl;
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
}

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

h1 { font-size: 24px; font-weight: 700; }
h2 { font-size: 20px; font-weight: 700; }
h3 { font-size: 16px; font-weight: 600; }
h4 { font-size: 14px; font-weight: 600; }

code {
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    color: var(--gray-800);
}

.muted {
    color: var(--gray-500);
    font-size: 13px;
}

/* ============================================================
   صفحه‌ی ورود / نصب
   ============================================================ */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    padding: 20px;
}

.auth-box {
    background: #fff;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
}

.auth-box h1 {
    font-size: 24px;
    text-align: center;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.auth-box .muted {
    text-align: center;
    margin-bottom: 28px;
}

.auth-box h3 {
    font-size: 16px;
    margin-bottom: 16px;
    color: var(--gray-700);
}

.auth-box label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 13px;
    color: var(--gray-700);
}

.auth-box input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 15px;
    font-family: inherit;
    margin-bottom: 16px;
    transition: var(--transition);
    background: #fff;
}

.auth-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

.auth-box ul {
    padding-right: 20px;
    margin-bottom: 20px;
    line-height: 2;
    font-size: 14px;
}

/* ============================================================
   دکمه‌ها
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
    line-height: 1.2;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none !important; }

.btn-primary   { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled)   { background: var(--primary-dark); }

.btn-success   { background: var(--success); color: #fff; }
.btn-success:hover:not(:disabled)   { background: var(--success-dark); }

.btn-danger    { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled)    { background: var(--danger-dark); }

.btn-warning   { background: var(--warning); color: #fff; }
.btn-warning:hover:not(:disabled)   { background: #b45309; }

.btn-secondary { background: var(--gray-200); color: var(--gray-800); }
.btn-secondary:hover:not(:disabled) { background: var(--gray-300); }

.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }

/* ============================================================
   هشدارها
   ============================================================ */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
    line-height: 1.6;
}
.alert-danger  { background: var(--danger-light);  color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: var(--success-light); color: #166534; border: 1px solid #bbf7d0; }
.alert-warning { background: var(--warning-light); color: #92400e; border: 1px solid #fde68a; }
.alert-info    { background: var(--info-light);    color: #1e40af; border: 1px solid #bfdbfe; }

/* ============================================================
   توپ‌بار (Header)
   ============================================================ */
.topbar {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-wrap: wrap;
    gap: 12px;
}

.topbar .brand {
    font-weight: 700;
    font-size: 18px;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.topbar nav {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
}

.topbar nav a {
    font-size: 14px;
    color: var(--gray-700);
    font-weight: 500;
}
.topbar nav a:hover {
    color: var(--primary);
    text-decoration: none;
}

.topbar .user-badge {
    background: var(--gray-100);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--gray-700);
    white-space: nowrap;
}

.topbar .btn-logout {
    background: var(--danger);
    color: #fff !important;
    padding: 7px 16px;
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
}
.topbar .btn-logout:hover {
    background: var(--danger-dark);
    text-decoration: none;
}

/* ============================================================
   کانتینر و کارت
   ============================================================ */
.container {
    max-width: 1100px;
    margin: 24px auto;
    padding: 0 20px;
}

.card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.card h2 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--gray-900);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--gray-100);
}

.card h3 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--gray-700);
}

/* ============================================================
   کارت جست‌وجو
   ============================================================ */
.search-card label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    font-size: 14px;
    color: var(--gray-700);
}

.search-row {
    display: flex;
    gap: 10px;
}

.search-row input {
    flex: 1;
    padding: 14px 18px;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 18px;
    font-family: inherit;
    text-align: center;
    letter-spacing: 1px;
    transition: var(--transition);
    background: #fff;
}

.search-row input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, .15);
}

.search-row .btn {
    padding: 14px 28px;
    font-size: 15px;
}

.status-text {
    margin-top: 14px;
    font-size: 14px;
    color: var(--gray-500);
    min-height: 22px;
    text-align: center;
    transition: var(--transition);
}

/* ============================================================
   کارت محصول
   ============================================================ */
.product-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 20px;
    border-top: 4px solid var(--primary);
    animation: fadeIn .25s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.product-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-100);
}

.product-header h2 {
    font-size: 22px;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.product-header .product-id {
    font-size: 13px;
    color: var(--gray-500);
}

/* ==== نمایش موجودی بزرگ ==== */
.stock-display {
    background: var(--gray-50);
    padding: 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    text-align: center;
    border: 1px solid var(--gray-100);
}

.stock-display .label {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 6px;
}

.stock-display .value {
    font-size: 42px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.1;
}

/* ==== کنترل موجودی محصول ساده (±) ==== */
.stock-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
}

.btn-plus,
.btn-minus {
    width: 58px;
    height: 58px;
    border-radius: 50%;
    font-size: 30px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: #fff;
    padding: 0;
    line-height: 1;
    font-family: inherit;
}

.btn-plus  { background: var(--success); }
.btn-plus:hover:not(:disabled)  { background: var(--success-dark); transform: scale(1.06); }
.btn-plus:active:not(:disabled) { transform: scale(.96); }

.btn-minus { background: var(--danger); }
.btn-minus:hover:not(:disabled) { background: var(--danger-dark);  transform: scale(1.06); }
.btn-minus:active:not(:disabled){ transform: scale(.96); }

.new-stock-input {
    width: 150px;
    padding: 12px;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 24px;
    text-align: center;
    font-weight: 700;
    font-family: inherit;
    transition: var(--transition);
    background: #fff;
}

.new-stock-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, .15);
}

/* ==== دکمه‌ی سبز ثبت موجودی ==== */
.btn-submit-stock {
    display: block;
    width: 100%;
    padding: 16px;
    background: var(--success);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    margin-top: 8px;
}

.btn-submit-stock:hover:not(:disabled) {
    background: var(--success-dark);
    transform: translateY(-1px);
}
.btn-submit-stock:disabled {
    opacity: .6;
    cursor: not-allowed;
}

/* ============================================================
   بخش بارکد کلی (محصولات متغیر)
   ============================================================ */
.bulk-barcode-section {
    background: var(--info-light);
    border: 1px solid #bae6fd;
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 20px;
}

.bulk-barcode-section > label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    color: #075985;
    margin-bottom: 10px;
}

.bulk-barcode-row {
    display: flex;
    gap: 8px;
}

.bulk-barcode-row input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid #bae6fd;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 15px;
    transition: var(--transition);
    background: #fff;
}

.bulk-barcode-row input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

.bulk-barcode-section .hint {
    font-size: 12px;
    color: #0369a1;
    margin-top: 8px;
    line-height: 1.6;
}

/* ============================================================
   واریانت‌ها
   ============================================================ */
.variants-section {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-200);
}

.variants-section > h3 {
    margin-bottom: 16px;
    color: var(--gray-800);
    font-size: 16px;
}

/* ==== ردیف واریانت (چیدمان flex عمودی) ==== */
.variant-row {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 14px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    margin-bottom: 10px;
    background: #fff;
    transition: var(--transition);
}

.variant-row:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
}

/* ==== خط اصلی: نام + stock + کنترل‌ها ==== */
.variant-row-main {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.variant-name {
    font-weight: 600;
    color: var(--gray-800);
    font-size: 14.5px;
    min-width: 100px;
    flex: 1 1 auto;
}

.variant-stock {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    padding: 5px 14px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 14px;
    min-width: 60px;
    text-align: center;
    color: var(--gray-700);
    white-space: nowrap;
}

.variant-stock.low {
    background: #fef3c7;
    color: #92400e;
}

.variant-stock.out {
    background: #fee2e2;
    color: #991b1b;
}

/* ==== کنترل‌های واریانت (± + input + submit) ==== */
.variant-stock-controls {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: nowrap;
    flex-shrink: 0;
}

.btn-plus-sm,
.btn-minus-sm {
    width: 38px;
    height: 38px;
    min-width: 38px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    padding: 0;
    line-height: 1;
    flex-shrink: 0;
    font-family: inherit;
}

.btn-plus-sm  { background: var(--success); }
.btn-plus-sm:hover:not(:disabled)  { background: var(--success-dark); transform: scale(1.08); }
.btn-plus-sm:active:not(:disabled) { transform: scale(.96); }

.btn-minus-sm { background: var(--danger); }
.btn-minus-sm:hover:not(:disabled) { background: var(--danger-dark); transform: scale(1.08); }
.btn-minus-sm:active:not(:disabled){ transform: scale(.96); }

.variant-edit-input {
    width: 90px;
    padding: 8px 10px;
    border: 1.5px solid var(--gray-300);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 15px;
    text-align: center;
    font-weight: 600;
    transition: var(--transition);
    background: #fff;
    height: 38px;
}

.variant-edit-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

.variant-stock-controls .btn-success {
    height: 38px;
    padding: 0 14px;
    font-size: 13px;
    font-weight: 500;
}

/* ==== ردیف بارکد اختصاصی واریانت ==== */
.variant-row-barcode {
    width: 100%;
}

.variant-row-barcode .barcode-setter {
    margin-top: 0;
}

/* ============================================================
   فیلد بارکد اختصاصی
   ============================================================ */
.barcode-setter {
    margin-top: 10px;
    padding: 12px 14px;
    border: 1px dashed var(--gray-300);
    border-radius: var(--radius);
    background: var(--gray-50);
}

.barcode-setter > label {
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--gray-600);
    font-weight: 500;
}

.barcode-row {
    display: flex;
    gap: 8px;
}

.barcode-row input {
    flex: 1;
    padding: 9px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 14px;
    transition: var(--transition);
    background: #fff;
}

.barcode-row input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

/* ============================================================
   لیست نتایج جست‌وجوی متنی
   ============================================================ */
.search-results-list {
    list-style: none;
    padding: 0;
}

.search-results-list li {
    padding: 14px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition);
    background: #fff;
}

.search-results-list li:hover {
    background: var(--gray-50);
    border-color: var(--primary);
    transform: translateX(-2px);
}

.search-results-list .r-name {
    font-weight: 500;
    color: var(--gray-800);
}

.search-results-list .r-id {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 2px;
}

/* ============================================================
   جدول داده‌ها
   ============================================================ */
.table-wrap {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}

table.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
    background: #fff;
}

table.data-table th,
table.data-table td {
    padding: 11px 14px;
    text-align: right;
    border-bottom: 1px solid var(--gray-200);
    white-space: nowrap;
}

table.data-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 13px;
}

table.data-table tbody tr {
    transition: var(--transition);
}

table.data-table tbody tr:hover {
    background: var(--gray-50);
}

table.data-table tbody tr:last-child td {
    border-bottom: none;
}

table.data-table .actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

/* ============================================================
   فرم‌ها
   ============================================================ */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 13px;
    color: var(--gray-700);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    background: #fff;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

.form-group input:disabled {
    background: var(--gray-100);
    color: var(--gray-500);
    cursor: not-allowed;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-left: 8px;
    cursor: pointer;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ============================================================
   فیلتر
   ============================================================ */
.filter-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: flex-end;
    margin-bottom: 20px;
}

.filter-row .form-group {
    margin-bottom: 0;
    min-width: 160px;
    flex: 1;
}

/* ============================================================
   کارت‌های آماری
   ============================================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: #fff;
    padding: 20px 22px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border-top: 3px solid var(--primary);
    transition: var(--transition);
}

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

.stat-card .label {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 10px;
    font-weight: 500;
}

.stat-card .value {
    font-size: 30px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.1;
}

.stat-card.success { border-top-color: var(--success); }
.stat-card.success .value { color: var(--success); }

.stat-card.danger { border-top-color: var(--danger); }
.stat-card.danger .value { color: var(--danger); }

.stat-card.warning { border-top-color: var(--warning); }
.stat-card.warning .value { color: var(--warning); }

/* ============================================================
   Pagination
   ============================================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    padding: 7px 13px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 13px;
    background: #fff;
    color: var(--gray-700);
    transition: var(--transition);
    min-width: 36px;
    text-align: center;
}

.pagination a:hover {
    background: var(--gray-50);
    border-color: var(--primary);
    color: var(--primary);
    text-decoration: none;
}

.pagination .active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    font-weight: 600;
}

/* ============================================================
   Toast
   ============================================================ */
#toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 14px 26px;
    border-radius: var(--radius);
    color: #fff;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    display: none;
    font-size: 14px;
    opacity: 0;
    transition: all .25s ease;
    max-width: 90vw;
    text-align: center;
}

#toast.success {
    background: var(--success);
    display: block;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}
#toast.error {
    background: var(--danger);
    display: block;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}
#toast.info {
    background: var(--primary);
    display: block;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============================================================
   Badge
   ============================================================ */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    line-height: 1.6;
    white-space: nowrap;
}

.badge-success { background: #d1fae5; color: #065f46; }
.badge-danger  { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-info    { background: #dbeafe; color: #1e40af; }
.badge-gray    { background: var(--gray-100); color: var(--gray-700); }

/* ============================================================
   حالت خالی
   ============================================================ */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray-500);
}

.empty-state .icon {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: .5;
}

/* ============================================================
   واکنش‌گرا
   ============================================================ */

/* تبلت */
@media (max-width: 900px) {
    .container { padding: 0 16px; }
    .product-header h2 { font-size: 20px; }
    .stock-display .value { font-size: 36px; }
}

/* موبایل */
@media (max-width: 640px) {
    body { font-size: 13.5px; }

    .topbar {
        padding: 10px 14px;
        gap: 8px;
    }
    .topbar .brand { font-size: 16px; }
    .topbar nav { gap: 10px; }
    .topbar nav a { font-size: 12.5px; }
    .topbar .user-badge { font-size: 11.5px; padding: 5px 10px; }
    .topbar .btn-logout { padding: 5px 12px; font-size: 12px; }

    .container { padding: 0 12px; margin: 16px auto; }

    .card { padding: 18px; }
    .auth-box { padding: 28px 22px; }
    .product-card { padding: 18px; }

    .search-row { flex-direction: column; }
    .search-row input { font-size: 16px; padding: 12px; }
    .search-row .btn { width: 100%; padding: 12px; }

    .form-row { grid-template-columns: 1fr; }

    .stock-controls { gap: 10px; }
    .btn-plus, .btn-minus {
        width: 48px;
        height: 48px;
        font-size: 24px;
    }
    .new-stock-input {
        width: 110px;
        font-size: 20px;
        padding: 10px;
    }
    .stock-display .value { font-size: 32px; }

    .bulk-barcode-row { flex-direction: column; }
    .bulk-barcode-row .btn { width: 100%; }

    /* واریانت در موبایل */
    .variant-row-main {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }
    .variant-name {
        min-width: 0;
        font-size: 14px;
    }
    .variant-stock { align-self: flex-start; }
    .variant-stock-controls {
        justify-content: flex-start;
        flex-wrap: wrap;
        gap: 6px;
    }
    .btn-plus-sm,
    .btn-minus-sm {
        width: 34px;
        height: 34px;
        min-width: 34px;
        font-size: 18px;
    }
    .variant-edit-input {
        width: 76px;
        height: 34px;
        font-size: 14px;
    }
    .variant-stock-controls .btn-success {
        height: 34px;
        font-size: 12.5px;
        padding: 0 10px;
    }

    .barcode-row { flex-direction: column; }
    .barcode-row .btn { width: 100%; }

    .filter-row {
        flex-direction: column;
        align-items: stretch;
    }
    .filter-row .form-group {
        width: 100%;
        min-width: 0;
    }

    .stats-grid { grid-template-columns: 1fr; }

    table.data-table th,
    table.data-table td {
        padding: 9px 10px;
        font-size: 12.5px;
    }

    #toast {
        bottom: 16px;
        padding: 12px 20px;
        font-size: 13px;
    }
}

/* موبایل کوچک */
@media (max-width: 400px) {
    .topbar .user-badge { display: none; }
    .search-row input { font-size: 15px; }
}