:root {
  --accent: #1a68d1;
  --accent-ink: #ffffff;
  --navy: #12263f;
  --ink: #1a2b4a;
  --muted: #5c6c84;
  --line: #e3ebf5;
  --surface: #ffffff;
  --bg: #f5f8fc;
  --ok: #15753d;
  --ok-bg: #e6f6ec;
  --warn: #8a5813;
  --warn-bg: #fdf3e2;
  --danger: #b32d2d;
  --danger-bg: #fbe9e9;
  --slate: #4a5568;
  --slate-bg: #edf1f7;
  --blue-bg: #e7f0fd;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(18,38,63,.08), 0 1px 2px rgba(18,38,63,.06);
}

* { box-sizing: border-box; }
html, body { overflow-x: hidden; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-size: 15px;
  line-height: 1.5;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { color: var(--navy); margin: 0 0 .5rem; font-weight: 650; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; }

/* App shell: sidebar + content */
.app { display: grid; grid-template-columns: 232px minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  background: var(--navy);
  color: #c7d3e3;
  padding: 1rem .75rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}
.brand {
  display: flex; align-items: center; gap: .55rem;
  color: #fff; font-weight: 700; font-size: 1.15rem;
  padding: .35rem .5rem 1rem;
}
.brand img { max-height: 28px; max-width: 120px; display: block; }
.brand .dot { width: 22px; height: 22px; border-radius: 6px; background: var(--accent); display: inline-block; }
.nav a {
  display: flex; align-items: center; gap: .6rem;
  color: #c7d3e3; padding: .55rem .65rem; border-radius: 6px;
  font-weight: 500; text-decoration: none;
}
.nav a:hover { background: rgba(255,255,255,.06); color: #fff; }
.nav a.active { background: var(--accent); color: #fff; }
.nav .sep { height: 1px; background: rgba(255,255,255,.1); margin: .5rem .25rem; }
.sidebar .spacer { flex: 1; }
.sidebar form { margin: 0; }
.signout {
  width: 100%; text-align: left; background: transparent; border: 0;
  color: #c7d3e3; padding: .55rem .65rem; border-radius: 6px; cursor: pointer;
  font: inherit; display: flex; align-items: center; gap: .6rem;
}
.signout:hover { background: rgba(255,255,255,.06); color: #fff; }

.content { min-width: 0; padding: 1.25rem 1.5rem 3rem; }
.topbar { display: none; }

.page-head {
  display: flex; flex-wrap: wrap; gap: .75rem;
  align-items: center; justify-content: space-between; margin-bottom: 1.1rem;
}
.page-head h1 { margin: 0; }

/* Buttons: one solid accent per screen, outline for secondary */
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem .9rem; border-radius: 6px; font-weight: 600; font-size: .92rem;
  border: 1px solid transparent; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #14549f; text-decoration: none; color: #fff; }
.btn-outline { background: #fff; color: var(--accent); border-color: var(--accent); }
.btn-outline:hover { background: var(--blue-bg); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--slate); border-color: var(--line); }
.btn-ghost:hover { background: var(--slate-bg); text-decoration: none; }
.btn-danger { background: #fff; color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger-bg); text-decoration: none; }
.btn-sm { padding: .3rem .6rem; font-size: .82rem; }
.btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

/* Cards */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 1.1rem 1.2rem;
}
.card + .card { margin-top: 1rem; }
.card h2 { margin-top: 0; }

/* Stat tiles */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(0, 1fr)); gap: 1rem; margin-bottom: 1.25rem; }
.tile { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1rem 1.1rem; }
.tile .label { color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
.tile .value { font-size: 1.6rem; font-weight: 700; color: var(--navy); margin-top: .25rem; }
.tile .value.danger { color: var(--danger); }
.tile .sub { color: var(--muted); font-size: .82rem; margin-top: .2rem; }

/* Tables wrapped for horizontal scroll on small screens */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table.data { width: 100%; border-collapse: collapse; min-width: 640px; }
table.data th, table.data td { padding: .7rem .85rem; text-align: left; border-bottom: 1px solid var(--line); }
table.data th { background: #fafcfe; color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; font-weight: 600; }
table.data tr:last-child td { border-bottom: 0; }
table.data tbody tr:hover { background: #f8fbff; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

/* Status badges */
.badge { display: inline-block; padding: .18rem .55rem; border-radius: 999px; font-size: .76rem; font-weight: 650; }
.badge.paid { background: var(--ok-bg); color: var(--ok); }
.badge.overdue { background: var(--danger-bg); color: var(--danger); }
.badge.partial { background: var(--warn-bg); color: var(--warn); }
.badge.open { background: var(--slate-bg); color: var(--slate); }
.badge.sent { background: var(--blue-bg); color: #1560c0; }
.badge.unsent { background: var(--slate-bg); color: var(--slate); }

/* Forms */
.field { margin-bottom: .9rem; }
.field label { display: block; font-weight: 600; font-size: .85rem; margin-bottom: .3rem; color: var(--ink); }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], select, textarea {
  width: 100%; padding: .55rem .65rem; border: 1px solid var(--line); border-radius: 6px;
  font: inherit; color: var(--ink); background: #fff;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
.hint { color: var(--muted); font-size: .8rem; margin-top: .3rem; }
.form-actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1rem; }
.row2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(0, 200px)); gap: .9rem; }

/* Search bar in content */
.searchbar { display: flex; gap: .5rem; margin-bottom: 1.1rem; }
.searchbar input { max-width: 420px; }

/* Line item editor */
.lines { width: 100%; border-collapse: collapse; }
.lines th { text-align: left; font-size: .78rem; color: var(--muted); text-transform: uppercase; padding: .3rem .4rem; }
.lines td { padding: .3rem .4rem; vertical-align: top; }
.lines input { min-width: 0; }
.lines .col-amt { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; padding-top: .95rem; }
.line-remove { background: transparent; border: 0; color: var(--danger); cursor: pointer; font-size: 1.1rem; padding: .5rem .3rem; }

/* Flash messages */
.flashes { margin-bottom: 1rem; display: grid; gap: .5rem; }
.flash { padding: .65rem .85rem; border-radius: 6px; font-weight: 500; border: 1px solid transparent; }
.flash.success { background: var(--ok-bg); color: #15753d; border-color: #b7e4c7; }
.flash.error { background: var(--danger-bg); color: #b32d2d; border-color: #f3c2c2; }
.flash.info { background: var(--blue-bg); color: #1560c0; border-color: #bcd8fb; }

/* Definition rows */
.dl { display: grid; grid-template-columns: minmax(0,160px) minmax(0,1fr); gap: .4rem .9rem; }
.dl dt { color: var(--muted); }
.dl dd { margin: 0; }

/* Contact card */
.contact { display: grid; grid-template-columns: repeat(auto-fit, minmax(0, 220px)); gap: .8rem 1.5rem; }
.contact .k { color: var(--muted); font-size: .8rem; }
.contact .v { font-weight: 500; }

.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.muted { color: var(--muted); }
.right { text-align: right; }
.mt1 { margin-top: 1rem; }
.empty { text-align: center; color: var(--muted); padding: 2.5rem 1rem; }

/* Bare pages (login, setup, 2fa) */
.bare { min-height: 100vh; display: grid; place-items: center; padding: 1.5rem; background: linear-gradient(160deg, #eaf1fb, #f5f8fc 55%); }
.bare-card { width: 100%; max-width: 400px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); padding: 1.6rem 1.5rem; }
.bare-card.wide { max-width: 460px; }
.bare-brand { display: flex; align-items: center; gap: .55rem; font-weight: 700; font-size: 1.3rem; color: var(--navy); margin-bottom: 1.1rem; justify-content: center; }
.bare-brand .dot { width: 24px; height: 24px; border-radius: 7px; background: var(--accent); }
.bare .btn-primary { width: 100%; justify-content: center; }
.bare-links { margin-top: 1rem; text-align: center; font-size: .88rem; }

/* QR enrollment */
.qr-box { display: grid; place-items: center; margin: 1rem 0; }
.qr-box canvas, .qr-box img { width: 200px; height: 200px; background: #fff; padding: 8px; border: 1px solid var(--line); border-radius: 8px; }
.secret { text-align: center; font-size: 1.05rem; letter-spacing: .04em; background: var(--slate-bg); padding: .5rem; border-radius: 6px; }
.codes { display: grid; grid-template-columns: repeat(2, 1fr); gap: .5rem; margin: 1rem 0; }
.codes span { background: var(--slate-bg); padding: .5rem; border-radius: 6px; text-align: center; font-weight: 600; }

/* Mobile */
@media (max-width: 820px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  .sidebar {
    position: fixed; inset: 0 auto 0 0; width: 240px; z-index: 40;
    transform: translateX(-100%); transition: transform .2s ease;
  }
  .sidebar.open { transform: translateX(0); }
  .topbar {
    display: flex; align-items: center; justify-content: space-between;
    background: var(--navy); color: #fff; padding: .7rem 1rem; position: sticky; top: 0; z-index: 30;
  }
  .topbar .brand { padding: 0; color: #fff; }
  .menu-toggle { background: transparent; border: 0; color: #fff; font-size: 1.4rem; cursor: pointer; padding: .2rem .4rem; }
  .scrim { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 35; }
  .scrim.show { display: block; }
  .content { padding: 1rem; }
  .codes { grid-template-columns: 1fr; }
}