:root {
    --bg-app: #f4f7f6;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --bg-input: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e2e8f0;
    --danger: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --info: #0ea5e9;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-app: #0b1120;
    --bg-sidebar: #1e293b;
    --bg-card: #1e293b;
    --bg-input: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Tajawal', sans-serif;
    background: var(--bg-app);
    color: var(--text-main);
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

.login-wrapper {
    position: fixed;
    inset: 0;
    background: var(--bg-app);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.login-box {
    background: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 400px;
    text-align: center;
    border: 1px solid var(--border);
}

.login-box h2 {
    font-size: 28px;
    font-weight: 900;
    margin-bottom: 5px;
    color: var(--text-main);
}

.login-box h2 span {
    color: var(--accent);
}

.login-box p {
    color: var(--text-muted);
    margin-bottom: 25px;
    font-size: 14px;
}

.login-box input {
    width: 100%;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-input);
    color: var(--text-main);
    font-family: inherit;
    outline: none;
    transition: 0.2s;
}

.login-box input:focus {
    border-color: var(--accent);
}

.login-box button {
    width: 100%;
    padding: 15px;
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 10px;
}

.login-error {
    color: var(--danger);
    font-size: 13px;
    font-weight: bold;
    min-height: 20px;
}

.dashboard-layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.sidebar {
    background: var(--bg-sidebar);
    border-top: 1px solid var(--border);
    display: flex;
    z-index: 50;
    transition: 0.3s;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    font-size: 20px;
    font-weight: 800;
    color: var(--text-main);
}

.sidebar-header span {
    color: var(--accent);
}

.sidebar-nav {
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.nav-link:hover {
    color: var(--text-main);
    background: var(--bg-input);
}

.nav-link.active {
    color: #fff;
    background: linear-gradient(90deg, var(--accent) 0%, rgba(59,130,246,0.8) 100%);
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}

.nav-link svg {
    transition: transform 0.3s;
}

.nav-link.active svg {
    transform: scale(1.1);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding-bottom: 70px;
}

.top-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-card);
    position: sticky;
    top: 0;
    z-index: 10;
    transition: 0.3s;
}

.header-title {
    font-size: 18px;
    font-weight: 900;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 20px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    transition: 0.3s;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    transition: 0.3s;
}

.status-dot.online {
    background: var(--success);
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.4);
}

.status-dot.offline {
    background: var(--danger);
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.4);
}

.content-wrapper {
    padding: 20px;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: var(--shadow);
    transition: 0.3s;
}

.stat-icon {
    width: 45px;
    height: 45px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: flex-start;
}

.stat-info p {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 4px;
    font-weight: 600;
}

.stat-info h3 {
    font-size: 22px;
    font-weight: 900;
    color: var(--text-main);
}

.section-header {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.search-input {
    width: 100%;
    padding: 12px 15px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-main);
    font-family: inherit;
    outline: none;
    transition: 0.2s;
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.header-actions {
    display: flex;
    gap: 10px;
}

.table-container {
    width: 100%;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: right;
}

.badge {
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 800;
    display: inline-block;
}

.badge.success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge.warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge.danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

.btn-primary, .btn-secondary, .btn-icon {
    font-family: inherit;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.2s;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    padding: 12px 20px;
    flex: 1;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 12px 20px;
}

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

.btn-icon {
    background: var(--bg-input);
    color: var(--text-muted);
    padding: 8px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.btn-icon:hover {
    color: var(--text-main);
    border-color: var(--text-muted);
}

.btn-icon.edit { color: var(--accent); }
.btn-icon.delete { color: var(--danger); background: rgba(239, 68, 68, 0.05); border-color: rgba(239, 68, 68, 0.2); }

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    display: none;
    align-items: flex-end;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    transition: 0.3s;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-card);
    width: 100%;
    border-radius: 24px 24px 0 0;
    border: 1px solid var(--border);
    box-shadow: 0 -10px 40px rgba(0,0,0,0.5);
    transform: translateY(100%);
    transition: 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    max-height: 90vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.sheet-handle {
    width: 40px;
    height: 5px;
    background: var(--border);
    border-radius: 10px;
    margin: 15px auto 5px;
}

.modal-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: var(--bg-card);
    z-index: 2;
}

.modal-header h3 { font-size: 18px; font-weight: 800; color: var(--text-main); }
.close-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 5px; }

.form-grid { display: flex; flex-direction: column; gap: 15px; padding: 15px 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.form-group { display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.form-group label { font-size: 13px; color: var(--text-muted); font-weight: 800; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 14px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 10px; color: var(--text-main); font-family: inherit; font-size: 14px; transition: 0.2s; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }
.form-group input:disabled { opacity: 0.6; cursor: not-allowed; }

.image-upload-area { border: 2px dashed var(--border); border-radius: 12px; height: 160px; display: flex; flex-direction: column; align-items: center; justify-content: center; cursor: pointer; color: var(--text-muted); transition: 0.2s; background: var(--bg-input); }
.image-upload-area:hover { border-color: var(--accent); color: var(--accent); }

.chips-container { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { background: var(--bg-input); border: 1px solid var(--border); padding: 6px 12px; border-radius: 20px; font-size: 12px; display: flex; align-items: center; gap: 8px; font-family: monospace; color: var(--text-main); font-weight: bold; }
.chip span { cursor: pointer; color: var(--danger); font-weight: bold; font-family: sans-serif; padding: 2px 6px; border-radius: 50%; background: rgba(239, 68, 68, 0.1); }

.toast-container { position: fixed; top: 20px; left: 50%; transform: translateX(-50%); z-index: 9999; display: flex; flex-direction: column; gap: 10px; width: 90%; max-width: 400px; pointer-events: none; }
.toast { background: var(--accent); color: #fff; padding: 16px 20px; border-radius: 12px; font-size: 14px; font-weight: 800; box-shadow: var(--shadow-md); animation: slideDown 0.3s cubic-bezier(0.2, 0.8, 0.2, 1); display: flex; justify-content: center; text-align: center; }

@keyframes slideDown {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.pos-layout { max-width: 1100px !important; height: 90vh; }
.pos-body { display: grid; grid-template-columns: 1fr 380px; height: calc(100% - 65px); gap: 20px; padding: 20px; background: var(--bg-app); }
.pos-products-section { display: flex; flex-direction: column; overflow: hidden; }
.pos-search-results { flex: 1; overflow-y: auto; display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; align-content: start; padding-right: 5px; }
.pos-product-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 15px; cursor: pointer; transition: 0.2s; text-align: center; box-shadow: var(--shadow); }
.pos-product-card:active { transform: scale(0.96); border-color: var(--accent); }
.pos-product-card img { width: 70px; height: 70px; border-radius: 10px; object-fit: cover; margin-bottom: 12px; border: 1px solid var(--border); }

.pos-cart-section { background: var(--bg-card); border-radius: 16px; border: 1px solid var(--border); display: flex; flex-direction: column; padding: 20px; box-shadow: var(--shadow); }
.cart-items { flex: 1; overflow-y: auto; border-bottom: 2px dashed var(--border); margin-bottom: 20px; padding-right: 5px; display: flex; flex-direction: column; gap: 10px; }
.cart-item { display: flex; justify-content: space-between; align-items: center; padding: 12px; border-radius: 10px; background: var(--bg-input); border: 1px solid var(--border); }
.cart-qty-ctrl { display: flex; align-items: center; gap: 10px; background: var(--bg-card); border-radius: 20px; padding: 4px; border: 1px solid var(--border); }
.cart-qty-ctrl button { background: var(--bg-input); border: none; color: var(--text-main); width: 28px; height: 28px; border-radius: 50%; cursor: pointer; font-weight: bold; transition: 0.2s; }
.cart-qty-ctrl button:active { background: var(--border); }

.cart-summary { background: var(--bg-input); padding: 20px; border-radius: 14px; border: 1px solid var(--border); }
.summary-row { display: flex; justify-content: space-between; font-size: 18px; font-weight: 900; color: var(--accent); margin-bottom: 15px; }

.logs-filter-bar { display: flex; flex-wrap: wrap; gap: 10px; padding: 15px; background: var(--bg-card); border-radius: var(--radius); margin-bottom: 15px; border: 1px solid var(--border); align-items: center; justify-content: space-between; }
.logs-timeline { display: flex; flex-direction: column; gap: 10px; }
.log-item { display: flex; align-items: flex-start; gap: 15px; background: var(--bg-card); padding: 15px; border-radius: var(--radius); border: 1px solid var(--border); border-right: 4px solid var(--border); }
.log-item.type-مبيعات { border-right-color: var(--success); }
.log-item.type-منتجات { border-right-color: var(--accent); }
.log-item.type-عملاء { border-right-color: var(--warning); }
.log-item.type-نظام { border-right-color: var(--danger); }
.log-item.type-عروض { border-right-color: #a855f7; }
.log-item.type-دخول { border-right-color: var(--info); }
.log-time { min-width: 80px; font-size: 11px; color: var(--text-muted); font-family: monospace; text-align: left; line-height: 1.4; }
.log-content { flex: 1; }
.log-content h4 { font-size: 14px; margin-bottom: 4px; color: var(--text-main); font-weight: 800; }
.log-content p { font-size: 13px; color: var(--text-muted); line-height: 1.5; margin: 0; }

.sales-tabs-container { display: flex; padding: 15px 15px 0; gap: 10px; border-bottom: 1px solid var(--border); margin-bottom: 20px; overflow-x: auto; }
.sales-tab { background: transparent; border: none; color: var(--text-muted); font-family: inherit; font-size: 15px; font-weight: 800; padding: 12px 20px; cursor: pointer; border-bottom: 3px solid transparent; transition: 0.2s; white-space: nowrap; }
.sales-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

tr.cursor-pointer { cursor: pointer; transition: background 0.2s; }
tr.cursor-pointer:hover { background: var(--bg-input); }
.return-input { width: 70px !important; padding: 6px !important; text-align: center; border: 1px solid var(--danger) !important; color: var(--danger) !important; background: rgba(239,68,68,0.05) !important; border-radius: 6px; font-weight: bold; }

.clean-copy { cursor: pointer; color: var(--text-muted); font-size: 12px; font-family: monospace; transition: 0.2s; user-select: none; background: var(--bg-input); padding: 4px 8px; border-radius: 6px; border: 1px solid var(--border); display: inline-flex; align-items: center; gap: 5px; }
.clean-copy:active { background: var(--accent); color: #fff; border-color: var(--accent); }

.tax-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
}
.tax-item-name { font-weight: bold; font-size: 14px; }
.tax-item-actions { display: flex; gap: 8px; }

#productsTableBody td:nth-child(1), #productsTable th:nth-child(1) { display: none !important; }

@media (max-width: 768px) {
    .hide-mobile { display: none !important; }
    
    .sidebar { position: fixed; bottom: 0; left: 0; right: 0; flex-direction: row; justify-content: space-around; padding: 10px 0 calc(10px + env(safe-area-inset-bottom)); background: var(--bg-card); border-top: 1px solid var(--border); }
    .sidebar-nav { flex-direction: row; padding: 0; width: 100%; justify-content: space-around; }
    .nav-link { flex-direction: column; gap: 4px; padding: 6px; font-size: 10px; background: transparent !important; border: none !important; }
    .nav-link.active { color: var(--accent); }
    .nav-link.active svg { transform: translateY(-3px); }
    
    #productsTable th, #clientsTable th, #invoicesTable th, #offersTable th, #invDetailsTable th { display: none; }
    
    #clientsTableBody tr { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; margin-bottom: 12px; padding: 16px; box-shadow: var(--shadow); display: grid; grid-template-columns: 1fr auto; grid-template-areas: "name name" "address address" "debt actions"; gap: 12px; align-items: center; }
    #clientsTableBody td { border: none; padding: 0; text-align: right; display: block; }
    #clientsTableBody td:nth-child(1) { grid-area: name; }
    #clientsTableBody td:nth-child(2) { grid-area: address; }
    #clientsTableBody td:nth-child(3) { grid-area: debt; justify-content: flex-start; }
    #clientsTableBody td:nth-child(4) { grid-area: actions; display: flex; justify-content: flex-end; }
    #clientsTableBody td::before { display: none; }
    
    #productsTableBody tr { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; margin-bottom: 12px; padding: 16px; box-shadow: var(--shadow); display: grid; grid-template-columns: 1fr auto; grid-template-areas: "info stock" "cat cat" "price actions"; gap: 12px; align-items: center; }
    #productsTableBody td { border: none; padding: 0; text-align: right; display: flex; align-items: center; justify-content: flex-start; }
    #productsTableBody td:nth-child(2) { grid-area: info; display: block; padding-bottom: 8px; border-bottom: 1px dashed var(--border); margin-bottom: 4px; }
    #productsTableBody td:nth-child(3) { grid-area: cat; }
    #productsTableBody td:nth-child(4) { grid-area: price; }
    #productsTableBody td:nth-child(5) { grid-area: stock; justify-content: flex-end; }
    #productsTableBody td:nth-child(6) { grid-area: actions; justify-content: flex-end; }
    #productsTableBody td::before { display: none; }

    #offersTableBody tr { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; margin-bottom: 12px; padding: 16px; box-shadow: var(--shadow); display: grid; grid-template-columns: 1fr auto; grid-template-areas: "name status" "qty price" "actions actions"; gap: 10px; align-items: center; }
    #offersTableBody td { border: none; padding: 0; text-align: right; display: flex; align-items: center; justify-content: flex-start; }
    #offersTableBody td:nth-child(1) { grid-area: name; font-weight: 900; font-size: 15px; color: var(--text-main); }
    #offersTableBody td:nth-child(2) { grid-area: qty; color: var(--text-muted); font-size: 13px; font-weight: bold; }
    #offersTableBody td:nth-child(3) { grid-area: price; font-weight: 900; color: var(--accent); font-size: 16px; }
    #offersTableBody td:nth-child(4) { grid-area: status; justify-content: flex-end; }
    #offersTableBody td:nth-child(5) { grid-area: actions; justify-content: flex-end; border-top: 1px solid var(--border); padding-top: 10px; margin-top: 5px; }
    #offersTableBody td::before { display: none; }

    #invoicesTableBody tr { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; margin-bottom: 12px; padding: 16px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 8px; }
    #invoicesTableBody td { border: none; padding: 0; display: flex; justify-content: space-between; align-items: center; }
    #invoicesTableBody td::before { content: attr(data-label); color: var(--text-muted); font-size: 12px; font-weight: bold; }

    #invModalItems tr { background: var(--bg-input); border: 1px solid var(--border); border-radius: 10px; margin-bottom: 10px; padding: 12px; display: flex; flex-direction: column; gap: 6px; }
    #invModalItems td { border: none; padding: 0; display: flex; justify-content: space-between; align-items: center; }
    #invModalItems td::before { content: attr(data-label); color: var(--text-muted); font-size: 11px; font-weight: bold; }

    .pos-body { grid-template-columns: 1fr; overflow-y: auto; display: flex; flex-direction: column; padding: 15px; }
    .pos-cart-section { flex: none; height: auto; }
}

@media (min-width: 768px) {
    .hide-desktop { display: none !important; }
    .dashboard-layout { flex-direction: row; }
    
    .sidebar { width: 260px; height: 100vh; position: sticky; top: 0; flex-direction: column; border-right: 1px solid var(--border); border-top: none; }
    .main-content { padding-bottom: 20px; }
    .section-header { flex-direction: row; }
    .search-input { width: 350px; }
    .modal-overlay { align-items: center; }
    .modal-content { border-radius: var(--radius); max-height: 85vh; transform: translateY(20px); }
    .form-grid { flex-direction: row; }
    .form-column { flex: 1; }
    
    #productsTableBody tr, #clientsTableBody tr, #invoicesTableBody tr, #offersTableBody tr, #invModalItems tr { display: table-row; background: var(--bg-card); transition: 0.2s; }
    #productsTableBody td, #clientsTableBody td, #invoicesTableBody td, #offersTableBody td, #invModalItems td { border-bottom: 1px solid var(--border); padding: 16px 20px; vertical-align: middle; display: table-cell; text-align: right; }
    #productsTableBody td::before, #clientsTableBody td::before, #invoicesTableBody td::before, #offersTableBody td::before, #invModalItems td::before { display: none; }
    
    .clean-copy { font-size: 13px; }
}