/* =========================================================================
   Freeman Billing — UI styles
   Modern, clean, responsive. Light + dark via prefers-color-scheme.
   Mobile-first: bottom tab bar on phones, side nav on desktop.
   ========================================================================= */

:root {
  --bg: #f6f7f9;
  --bg-elevated: #ffffff;
  --bg-subtle: #eef1f5;
  --surface: #ffffff;
  --surface-hover: #f2f4f7;
  --border: #e3e8ef;
  --border-strong: #cdd4df;
  --text: #0f172a;
  --text-muted: #5b6675;
  --text-soft: #8a93a3;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eef2ff;
  --primary-contrast: #ffffff;
  --success: #0f9d58;
  --success-soft: #e7f6ee;
  --warning: #d97706;
  --warning-soft: #fdf3e2;
  --danger: #dc2626;
  --danger-soft: #fdeaea;
  --info: #0ea5e9;
  --info-soft: #e3f4fd;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06), 0 1px 1px rgba(15, 23, 42, .04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, .08), 0 2px 4px rgba(15, 23, 42, .04);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, .12), 0 4px 8px rgba(15, 23, 42, .06);
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --gap: 16px;
  --gap-sm: 8px;
  --gap-lg: 24px;
  --maxw: 1100px;
  --nav-w: 240px;
  --tab-h: 64px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17;
    --bg-elevated: #111725;
    --bg-subtle: #0d1320;
    --surface: #121a2a;
    --surface-hover: #18233a;
    --border: #1f2a3d;
    --border-strong: #2c3a52;
    --text: #e8ecf2;
    --text-muted: #9aa6b8;
    --text-soft: #6b7689;
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --primary-soft: #1c2236;
    --primary-contrast: #ffffff;
    --success: #34d399;
    --success-soft: #0f2a20;
    --warning: #fbbf24;
    --warning-soft: #2a1f0a;
    --danger: #f87171;
    --danger-soft: #2a1414;
    --info: #38bdf8;
    --info-soft: #0d2433;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, .35);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, .5);
  }
}

/* Reset -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }

/* Layout ------------------------------------------------------------- */
.app {
  display: grid;
  grid-template-columns: var(--nav-w) 1fr;
  min-height: 100vh;
}
@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
}

/* Side nav (desktop) ------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  height: 100vh;
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 14px;
  gap: 4px;
  overflow-y: auto;
}
@media (max-width: 860px) { .nav { display: none; } }

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px 18px;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
}
.brand .logo {
  width: 34px; height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 15px;
  box-shadow: 0 4px 12px rgba(79, 70, 229, .35);
}
.brand small { display: block; font-weight: 500; color: var(--text-soft); font-size: 11px; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 500;
  font-size: 14px;
  text-decoration: none;
  transition: background .15s, color .15s;
}
.nav-link:hover { background: var(--surface-hover); color: var(--text); text-decoration: none; }
.nav-link.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.nav-link .icon { width: 20px; height: 20px; flex: 0 0 auto; opacity: .9; }

.nav-spacer { flex: 1; }
.nav-user {
  padding: 12px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-soft);
}
.nav-user b { color: var(--text-muted); display: block; margin-bottom: 2px; font-size: 13px; }

/* Top bar (mobile) --------------------------------------------------- */
.topbar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  align-items: center;
  justify-content: space-between;
}
@media (max-width: 860px) { .topbar { display: flex; } }
.topbar .brand { padding: 0; font-size: 15px; }
.topbar .brand .logo { width: 30px; height: 30px; font-size: 13px; }

/* Bottom tab bar (mobile) ------------------------------------------- */
.tabbar {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 30;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: 6px 4px env(safe-area-inset-bottom, 6px);
  grid-template-columns: repeat(5, 1fr);
}
@media (max-width: 860px) { .tabbar { display: grid; } }
.tabbar a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 2px;
  color: var(--text-soft);
  font-size: 10.5px;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
}
.tabbar a:hover { text-decoration: none; color: var(--text-muted); }
.tabbar a.active { color: var(--primary); }
.tabbar .icon { width: 22px; height: 22px; }

/* Main --------------------------------------------------------------- */
.main {
  padding: 28px 32px calc(var(--tab-h) + 24px);
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
}
@media (max-width: 860px) {
  .main { padding: 16px 14px calc(var(--tab-h) + 20px); }
}

/* Page header -------------------------------------------------------- */
.page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.page-head h1 {
  font-size: 22px;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.page-head .sub { color: var(--text-muted); font-size: 13.5px; margin-top: 3px; }
.page-head .actions { display: flex; gap: 8px; flex-wrap: wrap; }
@media (max-width: 860px) {
  .page-head h1 { font-size: 19px; }
}

/* Cards -------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}
.card + .card { margin-top: 14px; }
.card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: 12px;
}
.card-pad-lg { padding: 24px; }

/* Grid helpers ------------------------------------------------------- */
.grid { display: grid; gap: var(--gap); }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 720px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}
.stack { display: flex; flex-direction: column; gap: var(--gap); }
.row { display: flex; gap: var(--gap); align-items: center; flex-wrap: wrap; }
.spread { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.gap-sm { gap: var(--gap-sm); }
.wrap { flex-wrap: wrap; }

/* Stat tiles --------------------------------------------------------- */
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow-sm);
}
.stat .label {
  font-size: 12px;
  color: var(--text-soft);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.stat .value {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 6px;
  font-variant-numeric: tabular-nums;
}
.stat .value.muted { color: var(--text-muted); }
.stat .hint { font-size: 12px; color: var(--text-soft); margin-top: 4px; }
.stat.accent { border-left: 3px solid var(--primary); }
.stat.success { border-left: 3px solid var(--success); }
.stat.warning { border-left: 3px solid var(--warning); }
.stat.danger { border-left: 3px solid var(--danger); }

/* Buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, border-color .15s, transform .05s, box-shadow .15s;
  min-height: 42px;
  white-space: nowrap;
}
.btn:hover { background: var(--surface-hover); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: var(--primary);
  color: var(--primary-contrast);
  border-color: var(--primary);
  box-shadow: 0 2px 8px rgba(79, 70, 229, .25);
}
.btn.primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn.danger { color: var(--danger); border-color: var(--border-strong); }
.btn.danger:hover { background: var(--danger-soft); }
.btn.success { background: var(--success); color: #fff; border-color: var(--success); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.ghost:hover { background: var(--surface-hover); }
.btn.sm { padding: 7px 12px; min-height: 34px; font-size: 13px; }
.btn.lg { padding: 12px 22px; min-height: 48px; font-size: 15px; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* Forms -------------------------------------------------------------- */
.form-grid { display: grid; gap: 14px; grid-template-columns: 1fr 1fr; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 600px) { .form-grid { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 13px; font-weight: 600; color: var(--text-muted); }
.field .help { font-size: 12px; color: var(--text-soft); }
.input, .select, textarea.input {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 15px;
  transition: border-color .15s, box-shadow .15s;
  min-height: 44px;
}
.input:focus, .select:focus, textarea.input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, .15);
}
textarea.input { min-height: 72px; resize: vertical; }
.input.file { padding: 9px 11px; }
.select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%235b6675' d='M6 8L0 0h12z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
.checkbox { width: 18px; height: 18px; accent-color: var(--primary); }
.checkbox-list { display: flex; flex-direction: column; gap: 8px; }
.checkbox-list label {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.checkbox-list label:hover { background: var(--surface-hover); }
.checkbox-list input { accent-color: var(--primary); width: 18px; height: 18px; }
.checkbox-list label:has(input:checked) {
  background: var(--primary-soft);
  border-color: var(--primary);
}

/* Tables ------------------------------------------------------------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); }
table.tbl {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 14px;
}
.tbl th, .tbl td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.tbl th {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-soft);
  font-weight: 600;
  background: var(--bg-subtle);
  position: sticky; top: 0;
}
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl tbody tr:hover { background: var(--surface-hover); }
.tbl td.num, .tbl th.num { text-align: right; font-variant-numeric: tabular-nums; }
.tbl td.muted { color: var(--text-muted); }
@media (max-width: 860px) {
  .tbl th, .tbl td { padding: 10px 12px; font-size: 13.5px; }
}

/* Mobile card list (alternative to table on small screens) ----------- */
.cards-list { display: flex; flex-direction: column; gap: 10px; }
.list-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
}
.list-card .top { display: flex; justify-content: space-between; gap: 12px; align-items: start; }
.list-card .title { font-weight: 600; font-size: 14.5px; }
.list-card .meta { font-size: 12.5px; color: var(--text-muted); margin-top: 3px; }
.list-card .amt { font-weight: 700; font-variant-numeric: tabular-nums; font-size: 15px; }

/* Badges ------------------------------------------------------------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  background: var(--bg-subtle);
  color: var(--text-muted);
  letter-spacing: .01em;
  white-space: nowrap;
}
.badge.dot::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: currentColor;
}
.badge.open { background: var(--info-soft); color: var(--info); }
.badge.billed { background: var(--primary-soft); color: var(--primary); }
.badge.paid { background: var(--success-soft); color: var(--success); }
.badge.closed { background: var(--bg-subtle); color: var(--text-soft); }
.badge.draft { background: var(--warning-soft); color: var(--warning); }
.badge.issued { background: var(--info-soft); color: var(--info); }
.badge.receipt { background: var(--warning-soft); color: var(--warning); }

/* Alerts ------------------------------------------------------------- */
.alerts { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.alert {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  border: 1px solid var(--border);
  background: var(--surface);
}
.alert.success { background: var(--success-soft); border-color: var(--success); color: var(--success); }
.alert.error { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); }
.alert.warning { background: var(--warning-soft); border-color: var(--warning); color: var(--warning); }
.alert.info { background: var(--info-soft); border-color: var(--info); color: var(--info); }

/* Empty state -------------------------------------------------------- */
.empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-soft);
}
.empty .icon-big {
  width: 48px; height: 48px;
  margin: 0 auto 12px;
  opacity: .5;
}
.empty h3 { font-size: 15px; color: var(--text-muted); margin-bottom: 4px; font-weight: 600; }
.empty p { font-size: 13.5px; }
.empty .btn { margin-top: 14px; }

/* Key-value ---------------------------------------------------------- */
.kv { display: grid; grid-template-columns: 160px 1fr; gap: 10px 14px; font-size: 14px; }
.kv dt { color: var(--text-soft); font-weight: 500; }
.kv dd { color: var(--text); word-break: break-word; }
@media (max-width: 600px) { .kv { grid-template-columns: 110px 1fr; font-size: 13.5px; } }

/* Money -------------------------------------------------------------- */
.money { font-variant-numeric: tabular-nums; font-weight: 600; }
.money.lg { font-size: 22px; letter-spacing: -0.02em; }
.money.muted { color: var(--text-muted); font-weight: 500; }
.money.pos { color: var(--success); }
.money.neg { color: var(--danger); }

/* Toolbar / filters -------------------------------------------------- */
.toolbar {
  display: flex; gap: 8px; flex-wrap: wrap; align-items: end;
  margin-bottom: 16px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.toolbar .field { min-width: 140px; }
.toolbar .field label { font-size: 11.5px; margin-bottom: 2px; }

/* Print document ----------------------------------------------------- */
.print-doc {
  background: #fff;
  color: #000;
  max-width: 780px;
  margin: 0 auto;
  padding: 36px 40px;
  font-family: "Times New Roman", Georgia, serif;
  font-size: 13.5px;
  line-height: 1.5;
}
.print-doc h1, .print-doc h2 { font-family: "Times New Roman", Georgia, serif; }
.print-doc .doc-head { text-align: center; margin-bottom: 18px; }
.print-doc .doc-title { font-size: 18px; font-weight: 700; text-transform: uppercase; }
.print-doc .doc-number { font-size: 13px; margin-top: 4px; }
.print-doc .doc-parties { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 18px 0; }
.print-doc .party h3 { font-size: 11px; text-transform: uppercase; color: #555; margin-bottom: 4px; font-weight: 600; }
.print-doc .party p { font-size: 13px; margin-bottom: 2px; }
.print-doc table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 12.5px; }
.print-doc table th, .print-doc table td { border: 1px solid #888; padding: 6px 8px; }
.print-doc table th { background: #f0f0f0; text-align: left; }
.print-doc table td.num { text-align: right; }
.print-doc .totals { margin: 14px 0; font-size: 13px; }
.print-doc .totals .row { display: flex; justify-content: space-between; padding: 4px 0; border-bottom: 1px dotted #aaa; }
.print-doc .totals .row.final { font-weight: 700; font-size: 14px; border-bottom: 2px solid #000; }
.print-doc .sign { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin-top: 40px; font-size: 12.5px; }
.print-doc .sign .sign-block { border-top: 1px solid #000; padding-top: 6px; }
.print-doc .calc-note { font-size: 11.5px; color: #555; margin-top: 6px; }
.print-toolbar { max-width: 780px; margin: 0 auto 14px; display: flex; gap: 8px; }
@media print {
  .nav, .topbar, .tabbar, .print-toolbar, .alerts, .page-head { display: none !important; }
  .main { padding: 0 !important; max-width: none !important; }
  .print-doc { box-shadow: none; padding: 0; }
  body { background: #fff; }
}

/* Login -------------------------------------------------------------- */
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: radial-gradient(circle at 30% 20%, #1e1b4b, transparent 60%),
              radial-gradient(circle at 80% 80%, #4f46e5, transparent 55%),
              var(--bg);
}
.login-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  width: 100%;
  max-width: 360px;
  box-shadow: var(--shadow-lg);
}
.login-card .logo {
  width: 48px; height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 20px;
  margin: 0 auto 16px;
  box-shadow: 0 8px 24px rgba(79, 70, 229, .4);
}
.login-card h1 { text-align: center; font-size: 20px; margin-bottom: 4px; letter-spacing: -0.02em; }
.login-card .sub { text-align: center; color: var(--text-soft); font-size: 13px; margin-bottom: 22px; }
.login-card .field { margin-bottom: 14px; }

/* Icons (inline SVG via class) -------------------------------------- */
.icon { display: inline-block; }

/* Utilities ---------------------------------------------------------- */
.mt-0 { margin-top: 0; } .mt-sm { margin-top: 8px; } .mt { margin-top: 16px; } .mt-lg { margin-top: 24px; }
.mb-0 { margin-bottom: 0; } .mb-sm { margin-bottom: 8px; } .mb { margin-bottom: 16px; } .mb-lg { margin-bottom: 24px; }
.text-muted { color: var(--text-muted); }
.text-soft { color: var(--text-soft); }
.text-sm { font-size: 13px; }
.text-xs { font-size: 12px; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.fw-600 { font-weight: 600; } .fw-700 { font-weight: 700; }
.hide-mobile { display: initial; }
@media (max-width: 860px) { .hide-mobile { display: none !important; } }
.show-mobile { display: none; }
@media (max-width: 860px) { .show-mobile { display: initial; } }
.divider { height: 1px; background: var(--border); margin: 16px 0; border: 0; }