:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --text: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --shadow: 0 12px 35px rgba(15, 23, 42, 0.08);
    --radius: 18px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), transparent 34%),
        linear-gradient(135deg, #f8fafc 0%, #eef4ff 100%);
    color: var(--text);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 15px;
    line-height: 1.5;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
}

.container,
.main,
.content,
.page,
.wrapper {
    width: min(1320px, calc(100% - 28px));
    margin: 0 auto;
}

header,
.navbar,
.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.9);
    box-shadow: 0 4px 24px rgba(15, 23, 42, 0.05);
}

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

nav a,
.nav a,
.menu a,
.sidebar a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 13px;
    border-radius: 12px;
    color: #334155;
    font-weight: 650;
    transition: 0.18s ease;
}

nav a:hover,
.nav a:hover,
.menu a:hover,
.sidebar a:hover,
nav a.active,
.nav a.active,
.menu a.active,
.sidebar a.active {
    background: #eff6ff;
    color: var(--primary);
}

h1,
h2,
h3 {
    margin: 0 0 14px;
    letter-spacing: -0.03em;
    color: var(--text);
}

h1 {
    font-size: clamp(26px, 3vw, 38px);
}

h2 {
    font-size: clamp(22px, 2.2vw, 30px);
}

h3 {
    font-size: 18px;
}

p {
    color: var(--muted);
}

.card,
.panel,
.box,
.widget,
section,
.login-box,
.dashboard-card,
.stat-card {
    background: rgba(255, 255, 255, 0.94);
    border: 1px solid rgba(226, 232, 240, 0.95);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.card,
.panel,
.box,
.widget,
section {
    padding: 18px;
}

.dashboard,
.stats,
.cards,
.grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.stat-card,
.dashboard-card {
    padding: 18px;
    min-height: 115px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
    position: relative;
}

.stat-card::after,
.dashboard-card::after {
    content: "";
    position: absolute;
    right: -30px;
    top: -30px;
    width: 95px;
    height: 95px;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.08);
}

.stat-card .value,
.dashboard-card .value,
.stat-value,
.amount,
.total {
    font-size: 30px;
    font-weight: 850;
    letter-spacing: -0.05em;
    color: var(--text);
}

.stat-card .label,
.dashboard-card .label,
.stat-label {
    color: var(--muted);
    font-weight: 650;
}

button,
.btn,
input[type="submit"],
input[type="button"] {
    appearance: none;
    border: 0;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    padding: 11px 15px;
    font-weight: 750;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: 0.18s ease;
    box-shadow: 0 9px 20px rgba(37, 99, 235, 0.2);
}

button:hover,
.btn:hover,
input[type="submit"]:hover,
input[type="button"]:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

button:disabled,
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary,
.secondary {
    background: #e2e8f0;
    color: #0f172a;
    box-shadow: none;
}

.btn-success,
.success {
    background: var(--success);
}

.btn-warning,
.warning {
    background: var(--warning);
}

.btn-danger,
.danger,
.delete {
    background: var(--danger);
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    color: var(--text);
    padding: 11px 12px;
    outline: none;
    font: inherit;
    transition: 0.18s ease;
}

input:focus,
select:focus,
textarea:focus {
    border-color: rgba(37, 99, 235, 0.8);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.11);
}

label {
    display: block;
    margin-bottom: 6px;
    color: #334155;
    font-weight: 750;
}

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

form {
    margin: 0;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

thead th {
    background: #f8fafc;
    color: #334155;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

th,
td {
    padding: 13px 14px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: middle;
}

tbody tr:hover {
    background: #f8fbff;
}

tbody tr:last-child td {
    border-bottom: 0;
}

.table-responsive,
.responsive-table {
    width: 100%;
    overflow-x: auto;
    border-radius: 16px;
}

.alert,
.message,
.notice,
.error,
.success-message {
    padding: 13px 15px;
    border-radius: 14px;
    margin: 12px 0;
    font-weight: 650;
    border: 1px solid var(--border);
    background: #fff;
}

.alert-success,
.success-message {
    color: #166534;
    background: #ecfdf5;
    border-color: #bbf7d0;
}

.alert-danger,
.error {
    color: #991b1b;
    background: #fef2f2;
    border-color: #fecaca;
}

.badge,
.status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: 999px;
    padding: 5px 10px;
    font-size: 12px;
    font-weight: 800;
    background: #eef2ff;
    color: #3730a3;
}

.login-page,
.auth-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
}

.login-box,
.login-card {
    width: min(430px, 100%);
    padding: 28px;
}

.login-box h1,
.login-card h1 {
    text-align: center;
    margin-bottom: 6px;
}

.pos-layout,
.pos-grid,
.sales-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(360px, 0.75fr);
    gap: 18px;
    align-items: start;
}

.product-grid,
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
}

.product-card,
.item-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 14px;
    cursor: pointer;
    transition: 0.18s ease;
}

.product-card:hover,
.item-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: rgba(37, 99, 235, 0.35);
}

.cart,
.cart-box,
.order-summary {
    position: sticky;
    top: 82px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
}

.cart-total,
.grand-total {
    font-size: 28px;
    font-weight: 900;
    color: var(--primary);
    letter-spacing: -0.04em;
}

.actions,
.page-actions,
.form-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin: 12px 0;
}

.search,
.search-box {
    display: flex;
    gap: 10px;
    align-items: center;
}

.search input,
.search-box input {
    max-width: 420px;
}

hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 18px 0;
}

@media (max-width: 1100px) {
    .dashboard,
    .stats,
    .cards,
    .grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .pos-layout,
    .pos-grid,
    .sales-grid {
        grid-template-columns: 1fr;
    }

    .cart,
    .cart-box,
    .order-summary {
        position: static;
    }
}

@media (max-width: 680px) {
    body {
        font-size: 14px;
    }

    .container,
    .main,
    .content,
    .page,
    .wrapper {
        width: min(100% - 18px, 1320px);
    }

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

    .card,
    .panel,
    .box,
    .widget,
    section {
        padding: 14px;
        border-radius: 15px;
    }

    nav,
    .nav,
    .menu {
        gap: 6px;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 6px;
    }

    nav a,
    .nav a,
    .menu a,
    .sidebar a {
        white-space: nowrap;
        padding: 9px 11px;
    }

    table {
        min-width: 720px;
    }

    th,
    td {
        padding: 11px 12px;
    }

    .search,
    .search-box,
    .actions,
    .page-actions,
    .form-actions {
        align-items: stretch;
        flex-direction: column;
    }

    button,
    .btn,
    input[type="submit"],
    input[type="button"] {
        width: 100%;
    }
}

@media print {
    body {
        background: #fff;
    }

    header,
    nav,
    .navbar,
    .topbar,
    .actions,
    .page-actions,
    button,
    .btn {
        display: none !important;
    }

    .card,
    .panel,
    .box,
    section,
    table {
        box-shadow: none;
        border-color: #ddd;
    }
}