:root {
  --bg: #f3f5f8; --card: #ffffff; --text: #1f2430; --muted: #6b7385; --line: #e3e7ee;
  --accent: #1f3a5f; --accent-2: #2e5a8f; --accent-soft: #e8eef6;
  --ok: #1e8a4c; --ok-soft: #e3f4ea; --warn: #b26b00; --warn-soft: #fdf1dc;
  --danger: #c0392b; --danger-soft: #fbe5e2; --info: #2563a8; --info-soft: #e3edf9;
  --side: #1f3a5f; --side-text: #c9d4e5;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11151c; --card: #1a1f29; --text: #e5e8ee; --muted: #98a1b3; --line: #2b3240;
    --accent: #6f9fe0; --accent-2: #8db4ea; --accent-soft: #1f2b3d;
    --ok: #4cc07f; --ok-soft: #173024; --warn: #e3a444; --warn-soft: #33270f;
    --danger: #ef6b5d; --danger-soft: #3a1c19; --info: #6ea8ea; --info-soft: #172a41;
    --side: #0c1017; --side-text: #9fb0c8;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.5rem; margin: 0; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }
h3 { font-size: 1rem; margin: 0 0 8px; }
small, .muted { color: var(--muted); }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Shell */
.shell { display: flex; min-height: 100vh; }
.side { width: 230px; background: var(--side); color: var(--side-text); display: flex; flex-direction: column; padding: 20px 12px; position: sticky; top: 0; height: 100vh; flex-shrink: 0; }
.logo { display: block; font-size: 1.35rem; font-weight: 700; color: #fff; padding: 4px 12px 20px; letter-spacing: .3px; }
.logo span { font-weight: 400; color: #9fb3d1; }
.logo:hover { text-decoration: none; }
.logo-dark { color: var(--accent); padding: 0; }
.side nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.side nav a { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 8px; color: var(--side-text); font-weight: 500; }
.side nav a:hover { background: rgba(255,255,255,.07); text-decoration: none; color: #fff; }
.side nav a.active { background: rgba(255,255,255,.13); color: #fff; }
.side nav svg { width: 19px; height: 19px; flex-shrink: 0; }
.side-user { border-top: 1px solid rgba(255,255,255,.1); padding: 14px 12px 0; font-size: .88rem; display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.side-user a { color: #fff; }
.side-user form { margin: 0; }
.linkbtn { background: none; border: 0; color: var(--side-text); cursor: pointer; font: inherit; padding: 0; }
.linkbtn:hover { color: #fff; text-decoration: underline; }
.main { flex: 1; padding: 28px 32px 60px; min-width: 0; max-width: 1280px; }

@media (max-width: 860px) {
  .shell { flex-direction: column; }
  .side { width: 100%; height: auto; position: static; padding: 12px 16px; flex-direction: row; flex-wrap: wrap; align-items: center; gap: 8px; }
  .logo { padding: 0 8px 0 0; font-size: 1.15rem; }
  .side nav { flex-direction: row; overflow-x: auto; order: 3; width: 100%; flex: none; }
  .side nav a { padding: 7px 10px; white-space: nowrap; }
  .side nav a span { font-size: .9rem; }
  .side nav svg { display: none; }
  .side-user { border: 0; padding: 0; margin-left: auto; }
  .main { padding: 18px 16px 48px; }
}

/* Page header */
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head .sub { color: var(--muted); margin-top: 2px; }
.page-head .tools { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.crumb { font-size: .88rem; color: var(--muted); margin-bottom: 4px; }

/* Cards & grid */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
.card.flush { padding: 0; overflow: hidden; }
.card.flush > h2 { padding: 16px 20px 0; }
.card.narrow { max-width: 560px; }
.grid { display: grid; gap: 20px; }
.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)); }
@media (max-width: 1000px) { .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .grid-3 { grid-template-columns: 1fr; } }
@media (max-width: 700px) { .grid-2, .grid-4 { grid-template-columns: 1fr; } }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.stat .k { font-size: .82rem; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.stat .v { font-size: 1.55rem; font-weight: 650; margin-top: 4px; font-variant-numeric: tabular-nums; }
.stat .s { font-size: .85rem; color: var(--muted); }
.stat.danger .v { color: var(--danger); }

/* Tables */
.table-wrap { overflow-x: auto; }
table.t { width: 100%; border-collapse: collapse; }
table.t th { text-align: left; font-size: .78rem; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); font-weight: 600; padding: 10px 14px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.t td { padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.t tr:last-child td { border-bottom: 0; }
table.t tbody tr:hover td { background: var(--accent-soft); }
table.t th.num, table.t td.num { text-align: right; }
table.t tfoot td { font-weight: 600; border-top: 1px solid var(--line); }
table.t .actions-col { width: 1%; white-space: nowrap; text-align: right; }
.empty { padding: 28px 20px; text-align: center; color: var(--muted); }

/* Badges */
.badge { display: inline-block; padding: 2px 9px; border-radius: 99px; font-size: .78rem; font-weight: 600; white-space: nowrap; background: var(--accent-soft); color: var(--accent); }
.badge-ok { background: var(--ok-soft); color: var(--ok); }
.badge-warn { background: var(--warn-soft); color: var(--warn); }
.badge-danger { background: var(--danger-soft); color: var(--danger); }
.badge-info { background: var(--info-soft); color: var(--info); }
.badge-muted { background: var(--line); color: var(--muted); }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 15px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); font: inherit; font-weight: 550; cursor: pointer; white-space: nowrap; }
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .btn-primary { color: #0c1017; } }
.btn-primary:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { border-color: var(--danger); }
.btn-sm { padding: 4px 10px; font-size: .85rem; }
.btn-block { width: 100%; justify-content: center; }
.inline { display: inline; margin: 0; }

/* Forms */
.form { display: grid; gap: 14px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 18px; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 700px) { .form-grid { grid-template-columns: 1fr; } }
label { display: flex; flex-direction: column; gap: 5px; font-size: .88rem; font-weight: 550; }
label small { font-weight: 400; }
label.check { flex-direction: row; align-items: center; gap: 8px; font-weight: 500; }
input, select, textarea { font: inherit; padding: 8px 10px; border-radius: 7px; border: 1px solid var(--line); background: var(--card); color: var(--text); width: 100%; min-width: 0; }
input[type=checkbox] { width: auto; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
textarea { min-height: 80px; resize: vertical; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 0; }
legend { font-weight: 600; padding: 0 6px; }
.hint { font-size: .84rem; color: var(--muted); font-weight: 400; }

/* Flash */
.flash { padding: 11px 15px; border-radius: 8px; margin-bottom: 16px; font-weight: 500; }
.flash-success { background: var(--ok-soft); color: var(--ok); }
.flash-error { background: var(--danger-soft); color: var(--danger); }
.flash-info { background: var(--info-soft); color: var(--info); }

/* Login */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 16px; }
.login { width: 100%; max-width: 380px; display: grid; gap: 14px; padding: 32px; }
.login .logo { font-size: 1.7rem; }
.login p { margin: -10px 0 6px; }

/* Invoice editor */
.lines-edit td { padding: 8px 8px; vertical-align: top; }
.lines-edit input, .lines-edit select, .lines-edit textarea { padding: 6px 8px; }
.lines-edit textarea { min-height: 38px; height: 38px; }
.lines-edit .c-qty { width: 90px; }
.lines-edit .c-price { width: 120px; }
.lines-edit .c-vat { width: 150px; }
.lines-edit .c-total { width: 110px; }
.period-tag { font-size: .8rem; color: var(--muted); margin-top: 3px; }
.totals-box { margin-left: auto; max-width: 360px; }
.totals-box table { width: 100%; border-collapse: collapse; }
.totals-box td { padding: 5px 0; }
.totals-box td:last-child { text-align: right; font-variant-numeric: tabular-nums; }
.totals-box tr.grand td { font-size: 1.15rem; font-weight: 700; border-top: 2px solid var(--text); padding-top: 9px; }
.add-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 1000px) { .add-tabs { grid-template-columns: 1fr; } }
.add-tabs .card { margin: 0; }
.sub-pick { display: flex; justify-content: space-between; gap: 10px; align-items: center; padding: 9px 0; border-bottom: 1px solid var(--line); }
.sub-pick:last-child { border-bottom: 0; }
dl.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; margin: 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; }
.filters { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.filters a { padding: 5px 12px; border-radius: 99px; border: 1px solid var(--line); color: var(--text); font-size: .88rem; background: var(--card); }
.filters a.on { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .filters a.on { color: #0c1017; } }
.filters a:hover { text-decoration: none; }
.grid-side { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); align-items: start; }
@media (max-width: 1000px) { .grid-side { grid-template-columns: 1fr; } }