:root {
  --navy: #12213b;
  --navy-2: #1b2f4f;
  --accent: #3ba17a;
  --accent-2: #d9a441;
  --bg: #f4f6f9;
  --card: #ffffff;
  --border: #e1e6ee;
  --text: #1c2534;
  --muted: #71809a;
  --danger: #c0453a;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
.hidden { display: none !important; }

/* ---------- Login ---------- */
#loginScreen {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, var(--navy), var(--navy-2));
}
.login-card {
  background: var(--card); border-radius: 16px; padding: 2.5rem 2rem;
  width: 320px; text-align: center; box-shadow: 0 20px 50px rgba(0,0,0,.3);
}
.login-card h1 { font-size: 1.25rem; margin: 0 0 .25rem; }
.muted { color: var(--muted); font-size: .9rem; margin-bottom: 1.5rem; }
.pin-dots { display: flex; justify-content: center; gap: 12px; margin-bottom: 1.5rem; }
.pin-dots span { width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--border); }
.pin-dots span.filled { background: var(--navy); border-color: var(--navy); }
.pin-pad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.pin-pad button {
  padding: 16px 0; font-size: 1.1rem; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); cursor: pointer;
}
.pin-pad button:active { background: var(--border); }
.error-text { color: var(--danger); font-size: .85rem; min-height: 1.2em; margin-top: .75rem; }

/* ---------- App shell ---------- */
.topbar {
  display: flex; align-items: center; gap: 1.5rem; padding: .85rem 1.5rem;
  background: var(--navy); color: white;
}
.brand { font-weight: 600; }
.tabs { display: flex; gap: .5rem; flex: 1; }
.tab-btn {
  background: transparent; border: none; color: #b9c4d6; padding: .5rem 1rem;
  border-radius: 8px; cursor: pointer; font-size: .9rem;
}
.tab-btn.active { background: var(--navy-2); color: white; }
.logout-btn { background: transparent; border: 1px solid #3a4b6b; color: #cfd8e6; padding: .4rem .8rem; border-radius: 8px; cursor: pointer; }

main { padding: 1.5rem; max-width: 1000px; margin: 0 auto; }

.app-body { display: flex; gap: 1.5rem; align-items: flex-start; max-width: 1180px; margin: 0 auto; padding: 0 1.5rem; }
.app-body main { flex: 1; padding: 1.5rem 0; max-width: none; margin: 0; }
.setup-panel { width: 160px; flex-shrink: 0; padding: 1.5rem 0; display: flex; flex-direction: column; gap: 6px; position: sticky; top: 1.5rem; }
.setup-panel-label { font-size: .75rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); padding: 0 .5rem; margin-bottom: 2px; }
.setup-btn { text-align: left; background: transparent; border: 1px solid transparent; padding: .5rem .6rem; border-radius: 8px; cursor: pointer; font-size: .88rem; color: var(--text); }
.setup-btn:hover { background: var(--surface-1); }
.setup-btn.active { background: var(--surface-1); border-color: var(--border); font-weight: 500; }

/* ---------- Generic components ---------- */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem; margin-bottom: 1rem; }
.row { display: flex; gap: .75rem; flex-wrap: wrap; align-items: center; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
label { font-size: .8rem; color: var(--muted); display: block; margin-bottom: 3px; }
input, select, textarea {
  width: 100%; padding: .55rem .7rem; border: 1px solid var(--border); border-radius: 8px; font-size: .9rem;
}
button.primary {
  background: var(--navy); color: white; border: none; padding: .6rem 1.1rem; border-radius: 8px; cursor: pointer; font-size: .9rem;
}
button.secondary {
  background: white; color: var(--navy); border: 1px solid var(--border); padding: .6rem 1.1rem; border-radius: 8px; cursor: pointer; font-size: .9rem;
}
button.success { background: var(--accent); color: white; border: none; padding: .6rem 1.1rem; border-radius: 8px; cursor: pointer; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .6rem .5rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 500; font-size: .8rem; text-transform: uppercase; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .75rem; background: #eef1f6; color: var(--muted); }
.badge.green { background: #e5f4ee; color: var(--accent); }
.badge.gold { background: #faf1de; color: #a97a1f; }
.badge.red { background: #fbe9e7; color: #c0453a; }
.badge.blue { background: #e8eef9; color: #3457a0; }
.unit-item { padding: .6rem .75rem; border: 1px solid var(--border); border-radius: 8px; cursor: pointer; margin-bottom: 6px; }
.unit-item:hover { border-color: var(--navy); }
.unit-item.selected { border-color: var(--accent); background: #f2faf6; }
.result-box { background: #f9fafb; border-radius: 10px; padding: 1rem; margin-top: 1rem; }
.charge-row { display: flex; gap: .5rem; align-items: center; margin-bottom: 6px; }
.section-title { font-size: .95rem; font-weight: 600; margin: 1rem 0 .5rem; }

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(18,33,59,.55);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 4vh 1rem; overflow-y: auto; z-index: 1000;
}
.modal-box {
  background: var(--card); border-radius: 14px; padding: 1.5rem;
  width: 100%; max-width: 640px; box-shadow: 0 25px 60px rgba(0,0,0,.35);
  max-height: 92vh; overflow-y: auto;
}