:root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --ink: #18202f;
    --muted: #637083;
    --line: #dce3ed;
    --brand: #0f766e;
    --brand-dark: #115e59;
    --danger: #b42318;
    --warning: #9a6700;
    --success: #067647;
    --primary: #175cd3;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 15px;
}
a { color: var(--brand); text-decoration: none; }
input, select, textarea, button { font: inherit; }

.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: 250px;
    background: #102026;
    color: #fff;
    padding: 22px 16px;
    z-index: 20;
}
.brand {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
}
.sidebar nav { display: grid; gap: 6px; }
.sidebar a {
    color: #d8e6ea;
    padding: 11px 12px;
    border-radius: 7px;
}
.sidebar a:hover { background: #18323a; color: #fff; }
.main {
    margin-left: 250px;
    padding: 26px;
    min-height: 100vh;
}
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 22px;
}
.topbar h1 { margin: 0 0 5px; font-size: 28px; }
.topbar p { margin: 0; color: var(--muted); }
.user-chip {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 9px 13px;
}
.mobile-menu {
    display: none;
    position: fixed;
    right: 14px;
    bottom: 14px;
    z-index: 30;
    border: 0;
    background: var(--brand);
    color: #fff;
    padding: 11px 15px;
    border-radius: 999px;
}

.card, .table-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 18px;
    margin-bottom: 18px;
}
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stat strong { display: block; font-size: 26px; margin-bottom: 4px; }
.stat span { color: var(--muted); }

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}
.full { grid-column: 1 / -1; }
label { display: grid; gap: 6px; font-weight: 600; }
.hint, .muted { color: var(--muted); font-size: 13px; }
input, select, textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 7px;
    padding: 10px 11px;
    background: #fff;
    color: var(--ink);
}
textarea { min-height: 92px; resize: vertical; }
.actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}
.btn {
    border: 0;
    background: var(--brand);
    color: #fff;
    border-radius: 7px;
    padding: 10px 13px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
}
.btn:hover { background: var(--brand-dark); }
.btn.secondary { background: #e7eef7; color: var(--ink); }
.btn.danger { background: var(--danger); }
.btn.small { padding: 7px 9px; min-height: 31px; font-size: 13px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td {
    padding: 11px 10px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
}
th { color: var(--muted); font-size: 13px; font-weight: 700; }
.badge {
    display: inline-flex;
    border-radius: 999px;
    padding: 4px 8px;
    font-size: 12px;
    font-weight: 700;
    background: #eef2f6;
}
.badge-warning { color: var(--warning); background: #fff3cd; }
.badge-success { color: var(--success); background: #dcfae6; }
.badge-primary { color: var(--primary); background: #d1e9ff; }
.badge-danger { color: var(--danger); background: #fee4e2; }

.alert {
    border-radius: 8px;
    padding: 12px 14px;
    margin-bottom: 16px;
    border: 1px solid var(--line);
    background: #eef4ff;
}
.alert-success { background: #ecfdf3; color: var(--success); }
.alert-danger { background: #fef3f2; color: var(--danger); }
.alert-warning { background: #fffaeb; color: var(--warning); }

.invoice-box {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 28px;
}
.invoice-head {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 26px;
}
.logo {
    max-width: 150px;
    max-height: 80px;
    object-fit: contain;
}
.totals {
    margin-left: auto;
    max-width: 360px;
}
.totals .row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--line);
}
.totals .grand { font-size: 18px; font-weight: 700; }
.item-row {
    display: grid;
    grid-template-columns: 1.5fr 1fr .7fr .8fr .7fr .8fr auto;
    gap: 10px;
    align-items: start;
    margin-bottom: 10px;
}
.login-wrap {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
}
.login-card {
    width: min(430px, 100%);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 28px;
}

@media print {
    .sidebar, .topbar, .mobile-menu, .no-print, .actions { display: none !important; }
    .main { margin: 0; padding: 0; }
    body { background: #fff; }
    .invoice-box { border: 0; padding: 0; }
}

@media (max-width: 900px) {
    .sidebar { transform: translateX(-100%); transition: transform .2s ease; }
    .sidebar.open { transform: translateX(0); }
    .mobile-menu { display: block; }
    .main { margin-left: 0; padding: 18px; padding-bottom: 74px; }
    .grid-2, .grid-3, .grid-4, .form-grid { grid-template-columns: 1fr; }
    .invoice-head { display: grid; }
    .item-row { grid-template-columns: 1fr; border: 1px solid var(--line); border-radius: 8px; padding: 10px; }
}