:root {
  --bg: #e8ecf1;
  --elevated: #f7f9fb;
  --ink: #14181f;
  --muted: #5c6775;
  --line: #c5ced8;
  --steel: #2f4050;
  --steel-deep: #1c2833;
  --amber: #d4890b;
  --amber-deep: #a86a08;
  --success: #1f7a4d;
  --danger: #b42318;
  --info: #2a5f8f;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background:
    radial-gradient(ellipse 80% 50% at 0% 0%, rgba(212,137,11,.08), transparent 50%),
    linear-gradient(145deg, #dfe5ec 0%, #e8ecf1 40%, #d5dde6 100%);
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
.display { font-family: Oswald, Impact, sans-serif; letter-spacing: .02em; text-transform: uppercase; }
.panel { background: var(--elevated); border: 1px solid var(--line); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .65rem 1.1rem; border: 1px solid transparent; cursor: pointer; font: inherit; font-weight: 600;
}
.btn-primary { background: var(--amber); color: #1a1205; border-color: var(--amber-deep); }
.btn-steel { background: var(--steel-deep); color: #f3f6f9; }
.btn-ghost { background: transparent; border-color: var(--line); }
.field { display: flex; flex-direction: column; gap: .35rem; }
.field label { font-size: .78rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); }
.field input, .field select, .field textarea {
  width: 100%; padding: .7rem .85rem; border: 1px solid var(--line); background: #fff; font: inherit;
}
.badge {
  display: inline-flex; padding: .2rem .55rem; font-size: .72rem; font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase; border: 1px solid currentColor;
}
.badge-draft { color: var(--muted); background: #edf0f3; }
.badge-sent { color: var(--info); background: #e8f1f8; }
.badge-paid { color: var(--success); background: #e8f6ef; }
.badge-void { color: var(--danger); background: #f9eae8; }
table.data { width: 100%; border-collapse: collapse; }
table.data th, table.data td { padding: .85rem 1rem; text-align: left; border-bottom: 1px solid var(--line); }
table.data th { font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); background: rgba(47,64,80,.04); }
.shell { min-height: 100vh; display: grid; grid-template-columns: 260px 1fr; }
.sidebar {
  background: var(--steel-deep); color: #e8edf2; padding: 1.25rem;
  display: flex; flex-direction: column;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 28px 28px;
}
.brand { border-bottom: 1px solid rgba(255,255,255,.1); padding-bottom: 1.25rem; margin-bottom: 1.5rem; }
.brand-name { margin: 0; font-size: 2rem; color: var(--amber); line-height: 1; }
.brand-tag { margin: .35rem 0 0; font-size: .7rem; letter-spacing: .18em; text-transform: uppercase; color: rgba(255,255,255,.55); }
.sidebar nav { display: flex; flex-direction: column; gap: .25rem; flex: 1; }
.sidebar nav a { padding: .7rem .75rem; color: rgba(255,255,255,.75); font-weight: 500; }
.sidebar nav a.active, .sidebar nav a:hover { background: rgba(212,137,11,.15); color: var(--amber); }
.sidebar-user { border-top: 1px solid rgba(255,255,255,.1); padding-top: 1rem; display: flex; flex-direction: column; gap: .25rem; }
.sidebar-user span { font-size: .75rem; color: rgba(255,255,255,.5); }
.signout { margin-top: .5rem; font-size: .75rem; letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.6); }
.topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap;
  border-bottom: 1px solid var(--line); background: rgba(247,249,251,.8); padding: 1rem 1.5rem;
}
.eyebrow { margin: 0; font-size: .72rem; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); }
.accent-line { height: 3px; width: 10rem; background: linear-gradient(90deg, var(--amber), transparent); margin-bottom: .6rem; }
.content { padding: 1.5rem; }
.lang-switch { display: flex; align-items: center; gap: .4rem; font-size: .75rem; }
.lang-switch span { color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-right: .35rem; }
.lang-switch a { padding: .3rem .55rem; border: 1px solid var(--line); background: #fff; }
.lang-switch a.active { background: var(--steel-deep); color: #fff; border-color: #0f161c; }
.page-title { font-size: 2.4rem; margin: 0; color: var(--steel-deep); }
.muted { color: var(--muted); }
.grid-stats { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); margin: 1.5rem 0; }
.stat { padding: 1.1rem; }
.stat strong { display: block; margin-top: .6rem; font-size: 1.8rem; font-family: Oswald, sans-serif; }
.grid-2 { display: grid; gap: 1.25rem; grid-template-columns: 1.2fr .8fr; }
.flash { padding: .75rem 1rem; margin-bottom: 1rem; border: 1px solid var(--line); }
.flash-success { background: #e8f6ef; color: var(--success); }
.flash-error { background: #f9eae8; color: var(--danger); }
.form-grid { display: grid; gap: 1rem; grid-template-columns: 1fr 1fr; padding: 1.25rem; }
.form-grid .full { grid-column: 1 / -1; }
.toggle-row {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .75rem .9rem; border: 1px solid var(--line); background: #fff;
}
.toggle { position: relative; width: 2.75rem; height: 1.55rem; flex-shrink: 0; }
.toggle input { position: absolute; opacity: 0; inset: 0; cursor: pointer; z-index: 1; }
.toggle-track { display: block; width: 100%; height: 100%; border-radius: 999px; background: #c5ced8; }
.toggle input:checked + .toggle-track { background: var(--amber); }
.toggle-thumb {
  position: absolute; top: .18rem; left: .18rem; width: 1.2rem; height: 1.2rem;
  border-radius: 999px; background: #fff; box-shadow: 0 1px 2px rgba(0,0,0,.2); transition: transform .16s; pointer-events: none;
}
.toggle input:checked ~ .toggle-thumb { transform: translateX(1.15rem); }
.login-wrap {
  min-height: 100vh; display: grid; place-items: center; padding: 2rem;
  background: linear-gradient(120deg, #1c2833 0%, #243447 45%, #1a222c 100%);
  color: #eef2f6; position: relative;
}
.login-grid { width: min(1100px, 100%); display: grid; gap: 2rem; grid-template-columns: 1.1fr .9fr; align-items: center; }
.login-panel { background: var(--elevated); color: var(--ink); padding: 2rem; border: 1px solid var(--line); }
.tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1rem 0 1.25rem; }
.tabs button { border: 1px solid var(--line); background: #fff; padding: .55rem .9rem; cursor: pointer; font: inherit; font-weight: 600; }
.tabs button.active { background: var(--steel-deep); color: #fff; }
.tool-panel { display: none; padding: 1.25rem; }
.tool-panel.active { display: block; }
.invoice-sheet { max-width: 56rem; margin: 0 auto; padding: 2rem; }
.totals { margin-left: auto; max-width: 16rem; }
.totals div { display: flex; justify-content: space-between; margin: .25rem 0; }
.line-row { display: grid; gap: .75rem; grid-template-columns: 1.6fr .5fr .6fr auto; border: 1px solid var(--line); background: #fff; padding: .75rem; margin-bottom: .75rem; }
@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { min-height: auto; }
  .grid-2, .login-grid, .form-grid, .line-row { grid-template-columns: 1fr; }
}
@media print {
  .no-print { display: none !important; }
  body { background: #fff; }
  .invoice-sheet { border: none; box-shadow: none; }
  .shell, .main { display: block; }
}