:root {
  --bg: #f5f5f7;
  --panel: #ffffff;
  --ink: #1a1a1a;
  --ink-soft: #555;
  --ink-faint: #888;
  --border: #e3e3e6;
  --border-strong: #c8c8cc;
  --accent: #1f6feb;
  --accent-soft: #e8f0fe;
  --good: #16a34a;
  --warn: #d97706;
  --bad: #dc2626;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  font-size: 14px;
  color: var(--ink);
  background: var(--bg);
}

#app {
  min-height: 100vh;
}

/* ----- Login ----- */
.login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login form {
  background: var(--panel);
  padding: 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 360px;
}
.login h1 { margin-top: 0; font-size: 20px; }
.login input { width: 100%; }
.login .err { color: var(--bad); margin-top: 8px; font-size: 13px; }

/* ----- App shell ----- */
.shell {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}
@media (max-width: 720px) {
  .shell { grid-template-columns: 1fr; }
  .shell .nav { position: sticky; top: 0; z-index: 10; border-right: none; border-bottom: 1px solid var(--border); }
  .shell .nav ul { display: flex; gap: 4px; padding: 8px; }
  .shell .nav li { flex: 1; }
  .shell .nav a { text-align: center; }
  .shell .nav .brand { display: none; }
}

.nav {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 16px 0;
}
.nav .brand {
  font-weight: 700;
  font-size: 16px;
  padding: 0 16px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}
.nav ul { list-style: none; padding: 0; margin: 0; }
.nav a {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  color: var(--ink);
  border-left: 3px solid transparent;
  font-size: 14px;
}
.nav a:hover { background: var(--accent-soft); }
.nav a.active { background: var(--accent-soft); border-left-color: var(--accent); color: var(--accent); font-weight: 600; }
.nav .logout { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 12px; }
.nav .logout button { background: none; border: none; padding: 10px 16px; color: var(--ink-soft); cursor: pointer; font-size: 14px; }
.nav .logout button:hover { color: var(--ink); }

.main { padding: 24px; max-width: 1400px; }

/* ----- Quote builder ----- */
.builder {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 24px;
  align-items: start;
}
@media (max-width: 1024px) { .builder { grid-template-columns: 1fr; } }

.builder .form { display: flex; flex-direction: column; gap: 16px; }

.section {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.section h2 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.section h2 .add-btn { font-size: 12px; text-transform: none; letter-spacing: 0; }

.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.field label { font-size: 12px; color: var(--ink-soft); font-weight: 600; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.row3 { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 12px; }

input, select, textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  background: white;
  color: var(--ink);
}
input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}
textarea { resize: vertical; min-height: 60px; }
input[type="number"] { font-variant-numeric: tabular-nums; }

button {
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  background: white;
  color: var(--ink);
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
}
button:hover { background: var(--bg); }
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
button.primary:hover { background: #1858be; }
button.danger { color: var(--bad); border-color: var(--border); }
button.danger:hover { background: #fee; }
button.small { padding: 4px 8px; font-size: 12px; }
button.icon { padding: 4px 8px; }

table.lines { width: 100%; border-collapse: collapse; }
table.lines th {
  text-align: left;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  font-weight: 600;
  padding: 4px 6px;
  border-bottom: 1px solid var(--border);
}
table.lines th.num, table.lines td.num { text-align: right; font-variant-numeric: tabular-nums; }
table.lines td { padding: 4px 6px; vertical-align: middle; }
table.lines td input { padding: 6px 8px; font-size: 13px; }
table.lines tbody tr { border-bottom: 1px solid #f3f3f3; }

.totals-mini { margin-top: 8px; font-size: 12px; color: var(--ink-soft); display: flex; gap: 16px; flex-wrap: wrap; }
.totals-mini b { color: var(--ink); font-weight: 600; }

/* ----- Sidebar live summary ----- */
.summary-pane {
  position: sticky;
  top: 24px;
}
.summary {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.summary h3 { margin: 0 0 12px; font-size: 14px; text-transform: uppercase; letter-spacing: 0.06em; }
.summary table { width: 100%; border-collapse: collapse; }
.summary td { padding: 4px 0; font-size: 13px; }
.summary td.num { text-align: right; font-variant-numeric: tabular-nums; }
.summary tr.divide td { border-top: 1px solid var(--border); padding-top: 8px; }
.summary tr.grand td { font-weight: 700; font-size: 16px; padding-top: 8px; }
.summary tr.metric td { color: var(--ink-soft); font-size: 12px; }
.summary .actions { margin-top: 16px; display: flex; flex-direction: column; gap: 8px; }
.summary .save-status { font-size: 11px; color: var(--ink-faint); text-align: center; }

/* ----- Device count grid ----- */
.devices {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}
.device-cell {
  display: grid;
  grid-template-columns: 1fr 64px;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--bg);
  border-radius: 6px;
  font-size: 13px;
}
.device-cell .meta { font-size: 10px; color: var(--ink-faint); }
.device-cell input { padding: 4px 6px; font-size: 13px; }

.section-divider {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin: 12px 0 6px;
}

details.advanced {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
details.advanced > summary {
  cursor: pointer;
  font-size: 12px;
  color: var(--ink-soft);
  user-select: none;
}
details.advanced[open] > summary { margin-bottom: 12px; }

/* ----- Quote list ----- */
.list-table { background: var(--panel); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.list-table table { width: 100%; border-collapse: collapse; }
.list-table th { text-align: left; padding: 10px; border-bottom: 1px solid var(--border); font-size: 12px; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.04em; }
.list-table td { padding: 12px 10px; border-bottom: 1px solid #f3f3f3; }
.list-table tr:hover { background: var(--accent-soft); cursor: pointer; }
.list-table .num { text-align: right; font-variant-numeric: tabular-nums; }

.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; gap: 12px; }
.toolbar h1 { margin: 0; font-size: 22px; }

.empty { text-align: center; padding: 48px 24px; color: var(--ink-faint); }

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 16px;
  border-radius: 6px;
  background: var(--ink);
  color: white;
  box-shadow: var(--shadow);
  font-size: 13px;
  animation: slide-in 0.2s ease-out;
  z-index: 100;
}
.toast.error { background: var(--bad); }
@keyframes slide-in {
  from { transform: translateY(8px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Price book */
.pb-section { background: var(--panel); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px; }
.pb-section h2 { margin-top: 0; font-size: 16px; }
.pb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.pb-grid .field { margin: 0; }