:root {
    --ink: #14221f;
    --muted: #5c6b67;
    --line: #d7e2de;
    --paper: #f4f7f5;
    --card: #ffffff;
    --teal: #0f766e;
    --teal-dark: #134e4a;
    --sidebar: #102e2b;
    --accent: #e8f6f2;
    --danger: #9f1239;
    --warn: #9a6700;
    --ok: #047857;
    --shadow: 0 10px 30px rgba(16, 46, 43, 0.06);
    --radius: 14px;
    font-family: "Segoe UI", "Avenir Next", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--paper); }
a { color: var(--teal-dark); }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3 { font-weight: 650; letter-spacing: -0.02em; margin: 0; }
p { margin: 0; }

.shell { min-height: 100vh; display: grid; grid-template-columns: 248px 1fr; }
.sidebar {
    background: var(--sidebar);
    color: #e7f4f1;
    padding: 22px 16px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    position: sticky;
    top: 0;
    height: 100vh;
}
.brand { display: flex; gap: 12px; align-items: center; padding: 0 8px; }
.brand-mark {
    width: 40px; height: 40px; border-radius: 12px;
    display: grid; place-items: center;
    background: #1f8a7d; color: white; font-weight: 700;
}
.brand small { display: block; color: #b7d4ce; font-size: 12px; }
.nav { display: flex; flex-direction: column; gap: 4px; }
.nav a {
    color: #d7ebe7; text-decoration: none; padding: 10px 12px; border-radius: 10px;
    display: flex; justify-content: space-between; align-items: center;
}
.nav a:hover, .nav a.is-active { background: rgba(255,255,255,.08); color: white; }
.badge { background: #f59e0b; color: #1f1300; border-radius: 999px; padding: 1px 7px; font-size: 12px; }
.sidebar-user { margin-top: auto; padding: 12px; border-top: 1px solid rgba(255,255,255,.08); }
.sidebar-user form { margin-top: 8px; }
.main { padding: 28px; min-width: 0; }
.topbar { display: none; }
.guide-link { margin-left: auto; font-weight: 650; text-decoration: none; }
.public-bar {
    display: flex; justify-content: space-between; align-items: center; gap: 16px;
    padding: 16px 22px; background: var(--sidebar); color: white;
}
.public-bar .brand { color: white; text-decoration: none; }
.public-links { display: flex; gap: 14px; align-items: center; }
.public-links a { color: white; }
.public-main { width: min(920px, 100%); margin: 0 auto; padding: 28px 16px 48px; }
.guide h2 { margin: 28px 0 8px; scroll-margin-top: 12px; }
.guide h3 { margin: 18px 0 6px; font-size: 1.05rem; }
.guide p + p, .guide ul, .guide ol { margin-top: 8px; }
.guide ul, .guide ol { padding-left: 1.2rem; }
.guide li + li { margin-top: 4px; }
.guide section + section { margin-top: 8px; }
.guide-toc { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.guide-toc a {
    text-decoration: none; padding: 6px 10px; border-radius: 999px;
    background: white; border: 1px solid var(--line); font-size: 14px;
}

.page-head, .split { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; }
.page-head { margin-bottom: 20px; }
.lede { color: var(--muted); margin-top: 6px; }
.grid { display: grid; gap: 14px; }
.cards { grid-template-columns: repeat(4, minmax(0, 1fr)); margin-bottom: 16px; }
.card, .panel {
    background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.card { padding: 16px; }
.card span, .muted { color: var(--muted); font-size: 13px; }
.card strong { display: block; margin-top: 8px; font-size: 26px; letter-spacing: -0.03em; }
.panel { padding: 16px 18px 18px; }
.panel + .panel, .stack > * + * { margin-top: 14px; }
.section-title { margin-bottom: 12px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
td input[type="text"], td input:not([type]), td input[type="number"] { width: 100%; min-width: 8rem; }
tr.low td { background: #fff7ed; }
.filters { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; margin-bottom: 14px; }
label { display: grid; gap: 6px; font-size: 14px; }
input, select, textarea {
    background: white; border: 1px solid #c9d7d3; border-radius: 10px; padding: 10px 12px; min-height: 42px;
}
textarea { min-height: 90px; }
input:focus, select:focus, textarea:focus { outline: 3px solid rgba(15,118,110,.2); border-color: var(--teal); }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.span-2 { grid-column: span 2; }
.check { display: flex; align-items: center; gap: 8px; min-height: 42px; }

.btn, button {
    border: 0; background: var(--teal); color: white; border-radius: 10px; padding: 10px 14px;
    text-decoration: none; display: inline-flex; align-items: center; justify-content: center; cursor: pointer; min-height: 42px;
}
.btn.secondary, button.secondary { background: #e7f3f0; color: var(--teal-dark); }
.btn.danger, button.danger { background: var(--danger); }
.btn.ghost { background: transparent; color: #d7ebe7; padding-left: 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.alert { padding: 12px 14px; border-radius: 12px; margin-bottom: 14px; }
.alert-ok { background: #ecfdf5; color: #065f46; }
.alert-bad { background: #fff1f2; color: #9f1239; }
.alert-warn { background: #fffbeb; color: #92400e; }
.empty { padding: 28px; text-align: center; color: var(--muted); }
.pager { display: flex; gap: 12px; align-items: center; margin-top: 12px; }
.tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.tabs a { text-decoration: none; padding: 8px 12px; border-radius: 999px; background: white; border: 1px solid var(--line); }
.tabs a.is-active { background: var(--teal-dark); color: white; }
.status { font-size: 12px; border-radius: 999px; padding: 3px 8px; background: var(--accent); }
.status.paid { background: #d1fae5; color: var(--ok); }
.status.partial { background: #fef3c7; color: var(--warn); }
.status.unpaid, .status.reversed { background: #ffe4e6; color: var(--danger); }

.two-col { display: grid; grid-template-columns: 1.4fr .8fr; gap: 14px; }
.chart { display: flex; gap: 8px; align-items: end; min-height: 160px; overflow-x: auto; padding-top: 8px; }
.bar-col { width: 42px; text-align: center; font-size: 11px; color: var(--muted); }
.bars { height: 120px; display: flex; align-items: end; justify-content: center; gap: 3px; }
.bar { width: 12px; border-radius: 6px 6px 2px 2px; background: var(--teal); min-height: 2px; }
.bar.alt { background: #99d5cb; }
.sale-lines { display: grid; gap: 10px; }
.sale-line { display: grid; grid-template-columns: 1.4fr 1fr .6fr .7fr auto; gap: 8px; align-items: end; }
.total-box { background: var(--accent); border-radius: 12px; padding: 14px; display: grid; gap: 6px; }
.total-box b { font-size: 28px; }
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { width: min(440px, 100%); padding: 28px; }
.menu-btn { display: none; }

@media (max-width: 1100px) {
    .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
    .shell { display: block; }
    .sidebar { position: fixed; z-index: 20; transform: translateX(-105%); transition: transform .2s ease; width: min(280px, 86vw); }
    body.nav-open .sidebar { transform: none; }
    .topbar { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
    .menu-btn { display: inline-flex; background: white; color: var(--ink); border: 1px solid var(--line); }
    .form-grid, .sale-line, .cards, .two-col { grid-template-columns: 1fr; }
    .span-2 { grid-column: auto; }
    .main { padding: 16px; }
}

@media print {
    .sidebar, .topbar, .no-print { display: none !important; }
    .shell { display: block; }
    .main { padding: 0; }
    .card, .panel { box-shadow: none; }
}

.receipt { width: min(720px, 100%); margin: 24px auto; background: white; padding: 28px; }
.receipt-head { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.receipt h1 { font-size: 22px; }