:root {
  --brand: #0228ba; --brand-600: #021f93; --brand-50: #eef2ff; --ink: #0f172a; --muted: #64748b;
  --line: #e2e8f0; --bg: #f4f7fc; --card: #fff; --ok: #0f7a3e; --warn: #a15c00; --bad: #b42318;
  --radius: 12px; font-size: 15px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--bg); }
a { color: var(--brand); }
h1 { font-size: 1.35rem; margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 1.6rem 0 .6rem; font-weight: 650; }
.muted { color: var(--muted); } .small { font-size: .82rem; font-weight: 400; text-transform: none; letter-spacing: 0; }
.mono { font-variant-numeric: tabular-nums; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .88rem; }

.topbar { display: flex; align-items: center; gap: 1.5rem; padding: .55rem 1.5rem; background: #fff; border-bottom: 3px solid var(--brand); position: sticky; top: 0; z-index: 5; }
.brand { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--ink); font-size: 1.05rem; }
.brand img { height: 38px; } .brand b { color: var(--brand); }
.topbar nav { display: flex; gap: .3rem; flex: 1; }
.topbar nav a { text-decoration: none; color: var(--ink); padding: .45rem .8rem; border-radius: 8px; font-weight: 500; }
.topbar nav a:hover { background: var(--brand-50); }
.topbar nav a.active { background: var(--brand); color: #fff; }
.who { display: flex; align-items: center; gap: .6rem; color: var(--muted); margin: 0; }
.btn-link { background: none; border: 0; color: var(--brand); cursor: pointer; font: inherit; padding: 0; }

main { padding: 1.5rem; }
main.center { display: grid; place-items: center; min-height: calc(100vh - 60px); }
main.narrow { max-width: 1150px; margin: 0 auto; }
main.workspace { display: grid; grid-template-columns: minmax(420px, 1fr) minmax(380px, 1fr); gap: 1.5rem; align-items: start; max-width: 1600px; margin: 0 auto; }
@media (max-width: 1000px) { main.workspace { grid-template-columns: 1fr; } }

.panel, .card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem; box-shadow: 0 1px 2px rgba(15,23,42,.04); }
.preview-panel { position: sticky; top: 76px; }
.form-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; flex-wrap: wrap; }
.inv-no { display: grid; text-align: right; background: var(--brand-50); border: 1px dashed #a5b4fc; padding: .45rem .8rem; border-radius: 10px; }
.inv-no .label { font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.inv-no #inv-number { font-family: ui-monospace, Menlo, monospace; font-weight: 700; color: var(--brand); }
.inv-no .hint { font-size: .7rem; color: var(--muted); }

label { display: grid; gap: .35rem; font-weight: 550; font-size: .88rem; }
input, textarea { font: inherit; font-weight: 400; color: var(--ink); border: 1px solid #cbd5e1; border-radius: 8px; padding: .55rem .65rem; background: #fff; width: 100%; }
input:focus, textarea:focus { outline: 2px solid #c7d2fe; border-color: var(--brand); }
textarea { resize: vertical; min-height: 2.6rem; line-height: 1.35; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; margin-top: 1.2rem; }
.grid2 .span2 { grid-column: 1 / -1; }

.items-head, .item { display: grid; grid-template-columns: 1fr 80px 110px 100px 32px; gap: .5rem; align-items: start; }
.items-head { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); padding: 0 0 .35rem; }
.item { padding: .5rem 0; border-top: 1px solid var(--line); }
.line-total { padding: .6rem 0; text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }
.icon-btn { border: 0; background: none; color: var(--muted); font-size: 1.35rem; cursor: pointer; line-height: 1; padding: .45rem 0; border-radius: 6px; }
.icon-btn:hover { color: var(--bad); background: #fef2f2; }
@media (max-width: 560px) { .items-head { display: none; } .item { grid-template-columns: 1fr 1fr 1fr 32px; } .item textarea { grid-column: 1 / -1; } }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: .4rem; font: inherit; font-weight: 600; font-size: .9rem; border: 1px solid #cbd5e1; background: #fff; color: var(--ink); border-radius: 8px; padding: .6rem 1rem; cursor: pointer; text-decoration: none; }
.btn:hover { border-color: var(--brand); color: var(--brand); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-600); color: #fff; }
.btn.ghost { border-color: transparent; color: var(--brand); }
.btn.ghost:hover { background: var(--brand-50); }
.btn.danger:hover { border-color: var(--bad); color: var(--bad); }
.btn.small { padding: .3rem .6rem; font-size: .8rem; }
.btn.wide { width: 100%; }
.btn[disabled] { opacity: .6; cursor: progress; }
#add-item { margin-top: .4rem; }
.gst-note { align-self: end; margin: 0 0 .6rem; }

.summary { margin-top: 1.4rem; border-top: 2px solid var(--brand); padding-top: .8rem; display: grid; gap: .35rem; }
.summary div { display: flex; justify-content: space-between; font-variant-numeric: tabular-nums; }
.summary .grand { font-size: 1.15rem; color: var(--brand); padding-top: .3rem; }
.actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.4rem; }

.alert { background: #fef2f2; border: 1px solid #fecaca; color: var(--bad); border-radius: 8px; padding: .7rem .9rem; margin-top: 1rem; font-size: .9rem; }
.alert ul { margin: .2rem 0 0; padding-left: 1.1rem; }
.flash { max-width: 1150px; margin: 1rem auto 0; padding: 0 1.5rem; }
.flash div { background: #ecfdf3; border: 1px solid #abefc6; color: var(--ok); border-radius: 8px; padding: .6rem .9rem; }
.toast { position: fixed; bottom: 1.2rem; left: 50%; transform: translateX(-50%); background: var(--ink); color: #fff; padding: .7rem 1.1rem; border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,.2); z-index: 20; }

.preview-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: .8rem; }
.preview-head h2 { margin: 0; }
.fit { font-size: .8rem; font-weight: 600; padding: .25rem .6rem; border-radius: 999px; background: #f1f5f9; color: var(--muted); }
.fit.ok { background: #ecfdf3; color: var(--ok); } .fit.warn { background: #fff7ed; color: var(--warn); } .fit.bad { background: #fef2f2; color: var(--bad); }
.sheet-wrap { position: relative; overflow: hidden; border-radius: 6px; box-shadow: 0 6px 24px rgba(2,40,186,.12), 0 0 0 1px var(--line); }
.sheet { width: 210mm; height: 297mm; position: absolute; top: 0; left: 0; transform-origin: 0 0; background-size: 100% 100%; background-color: #fff; }
.sheet-region { position: absolute; top: 44mm; left: 0; width: 210mm; height: 127mm; overflow: hidden; }
.sheet-region.loading { opacity: .55; transition: opacity .15s; }

.login { width: min(400px, 92vw); display: grid; gap: 1rem; text-align: center; }
.login-logo { height: 90px; margin: 0 auto; }
.login label { text-align: left; }

.search { display: flex; gap: .5rem; } .search input { min-width: 260px; }
.table-wrap { overflow-x: auto; margin-top: 1.2rem; }
table.list { width: 100%; border-collapse: collapse; }
table.list th { text-align: left; font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); border-bottom: 2px solid var(--brand); padding: .5rem; }
table.list td { padding: .65rem .5rem; border-bottom: 1px solid var(--line); vertical-align: middle; }
table.list .num { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
.row-actions { display: flex; gap: .35rem; justify-content: flex-end; flex-wrap: wrap; }
.row-actions form { margin: 0; }
.pager { display: flex; gap: 1rem; align-items: center; justify-content: center; margin-top: 1rem; }
.empty { padding: 2rem 0; text-align: center; color: var(--muted); }

@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; gap: .4rem .8rem; padding: .5rem .8rem; }
  .brand span, .who span { display: none; }
  .topbar nav { order: 3; flex-basis: 100%; }
  .topbar nav a { padding: .35rem .6rem; }
  .who { margin-left: auto; }
  main { padding: .8rem; }
  .panel { padding: 1rem; }
  .preview-panel { position: static; }
}