:root {
    --bg: #f4f7fb;
    --panel: #ffffff;
    --ink: #172033;
    --muted: #6b7280;
    --line: #dbe3ef;
    --primary: #0f766e;
    --primary-dark: #115e59;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #d97706;
    --shadow: 0 16px 40px rgba(20, 32, 54, .08);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Arial, "Noto Sans Bengali", sans-serif;
    color: var(--ink);
    background: var(--bg);
}
a { color: var(--primary); text-decoration: none; }
input, select, textarea, button {
    font: inherit;
}
input, select, textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 11px 12px;
    background: #fff;
    color: var(--ink);
}
label {
    display: grid;
    gap: 7px;
    font-weight: 700;
    color: #344054;
}

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 260px 1fr;
}
.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 22px;
    background: #102a43;
    color: #fff;
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.brand {
    display: flex;
    gap: 12px;
    align-items: center;
    color: #fff;
}
.brand-mark {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: 8px;
    background: #12b76a;
    color: #fff;
    font-weight: 800;
}
.brand small {
    display: block;
    color: #b8c7d9;
    margin-top: 3px;
}
.sidebar nav {
    display: grid;
    gap: 8px;
}
.sidebar nav a, .logout {
    color: #d7e4f3;
    padding: 12px 14px;
    border-radius: 8px;
}
.sidebar nav a.active, .sidebar nav a:hover, .logout:hover {
    background: rgba(255,255,255,.12);
    color: #fff;
}
.logout { margin-top: auto; }

.content {
    padding: 26px;
    display: grid;
    gap: 22px;
    align-content: start;
}
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.topbar h1 {
    margin: 0;
    font-size: 26px;
}
.topbar p {
    margin: 4px 0 0;
    color: var(--muted);
}
.menu-button {
    display: none;
    border: 0;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    padding: 10px 12px;
}
.user-pill {
    background: #e6fffb;
    color: var(--primary-dark);
    border: 1px solid #b3f0e8;
    border-radius: 999px;
    padding: 9px 14px;
    font-weight: 700;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
}
.stats-grid.compact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}
.stat-card, .panel, .customer-summary, .login-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}
.stat-card {
    padding: 18px;
    border-left: 5px solid var(--primary);
}
.stat-card span {
    color: var(--muted);
    font-weight: 700;
}
.stat-card strong {
    display: block;
    margin-top: 10px;
    font-size: 25px;
}
.stat-card.success { border-left-color: var(--success); }
.stat-card.warning { border-left-color: var(--warning); }
.stat-card.advance { border-left-color: #2563eb; }

.split-grid {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 18px;
    align-items: start;
}
.panel {
    padding: 18px;
}
.panel-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}
.panel h2, .panel-head h2 {
    margin: 0;
    font-size: 18px;
}
.form-panel {
    display: grid;
    gap: 14px;
}
.wide-form {
    max-width: 880px;
}
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}
.search-form, .filter-bar {
    display: flex;
    gap: 10px;
    align-items: end;
}
.filter-bar {
    flex-wrap: wrap;
}
.report-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 18px;
}
.report-heading h2 {
    margin: 0 0 6px;
    font-size: 24px;
}
.report-heading p {
    margin: 0;
    color: var(--muted);
}
.report-meta {
    display: grid;
    gap: 5px;
    text-align: right;
    color: var(--muted);
}
.report-meta strong {
    color: var(--ink);
}
.report-signatures {
    display: none;
    justify-content: space-between;
    gap: 60px;
    margin-top: 48px;
}
.report-signatures span {
    min-width: 170px;
    padding-top: 10px;
    border-top: 1px solid #98a2b3;
    text-align: center;
    color: #344054;
    font-weight: 700;
}
.print-only {
    display: none;
}
.table-wrap {
    width: 100%;
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    padding: 12px 10px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: middle;
}
th {
    color: #475467;
    font-size: 13px;
    text-transform: uppercase;
}
.right { text-align: right; }
.badge {
    display: inline-block;
    border-radius: 999px;
    padding: 5px 9px;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}
.badge.sale { background: #fff7ed; color: #c2410c; }
.badge.payment { background: #ecfdf3; color: #067647; }
.danger-text { color: var(--danger); font-weight: 800; }
.success-text { color: var(--success); font-weight: 800; }
.advance-text { color: #2563eb; font-weight: 800; }

.button, .mini-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    padding: 11px 15px;
    font-weight: 800;
    cursor: pointer;
}
.button:hover, .mini-button:hover {
    background: var(--primary-dark);
    color: #fff;
}
.button.danger, .mini-button.danger {
    background: var(--danger);
    color: #fff;
}
.button.danger:hover, .mini-button.danger:hover {
    background: #b91c1c;
}
.button.ghost {
    background: #eef6f5;
    color: var(--primary-dark);
    border: 1px solid #cce7e3;
}
.mini-button.ghost {
    background: #eef6f5;
    color: var(--primary-dark);
    border: 1px solid #cce7e3;
}
.button.full { width: 100%; }
.mini-button {
    padding: 7px 10px;
    font-size: 13px;
}
.action-buttons {
    display: inline-flex;
    justify-content: flex-end;
    gap: 7px;
    align-items: center;
}
.action-buttons form {
    margin: 0;
}
.form-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.delete-panel {
    max-width: 880px;
    display: grid;
    gap: 10px;
    border-color: #fecaca;
}
.delete-panel h2 {
    color: var(--danger);
}
.delete-panel p {
    margin: 0;
    color: var(--muted);
}
.alert {
    border-radius: 8px;
    padding: 12px 14px;
    font-weight: 700;
}
.alert.success { background: #ecfdf3; color: #067647; border: 1px solid #abefc6; }
.alert.error { background: #fef3f2; color: #b42318; border: 1px solid #fecdca; }
.customer-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 18px;
}
.customer-summary h2 {
    margin: 0 0 5px;
}
.customer-summary p {
    margin: 0;
    color: var(--muted);
}
.customer-summary strong {
    font-size: 28px;
}
.balance-box {
    display: grid;
    gap: 4px;
    text-align: right;
}
.balance-box span {
    color: var(--muted);
    font-weight: 700;
}

.login-body {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
    background: linear-gradient(135deg, #102a43 0%, #0f766e 100%);
}
.login-card {
    width: min(430px, 100%);
    padding: 28px;
    display: grid;
    gap: 15px;
}
.login-card h1 {
    margin: 0;
}
.login-card p {
    margin: 0;
    color: var(--muted);
}
.muted {
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 980px) {
    .app-shell {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        width: 260px;
        transform: translateX(-100%);
        transition: transform .2s ease;
        z-index: 10;
    }
    .app-shell.menu-open .sidebar {
        transform: translateX(0);
    }
    .menu-button {
        display: inline-flex;
    }
    .stats-grid, .stats-grid.compact, .split-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 620px) {
    .content {
        padding: 16px;
    }
    .topbar {
        align-items: flex-start;
    }
    .user-pill {
        display: none;
    }
    .form-grid, .search-form {
        grid-template-columns: 1fr;
        display: grid;
    }
    .customer-summary {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media print {
    body {
        background: #fff;
        color: #000;
    }
    .sidebar, .topbar, .button, .form-panel, .filter-bar, .no-print, .alert {
        display: none !important;
    }
    .print-only {
        display: flex;
    }
    .app-shell {
        display: block;
    }
    .content {
        padding: 0;
    }
    .panel, .customer-summary {
        box-shadow: none;
        border: 0;
        padding: 0;
    }
    .report-heading {
        border-bottom: 2px solid #111;
        border-radius: 0;
        margin-bottom: 16px;
        padding-bottom: 12px;
    }
    .stats-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
        margin-bottom: 14px;
    }
    .stat-card {
        box-shadow: none;
        border: 1px solid #98a2b3;
        border-left: 4px solid #111;
        padding: 10px;
    }
    .stat-card strong {
        font-size: 18px;
    }
    table {
        font-size: 12px;
    }
    th, td {
        padding: 7px 6px;
        border-bottom: 1px solid #cbd5e1;
    }
    .report-signatures {
        display: flex;
    }
}