:root {
  --bg: #0f1020;
  --card: #1a1b33;
  --card2: #232444;
  --ink: #e9e9f5;
  --muted: #9a9ac0;
  --accent: #8b5cf6;
  --accent2: #6d28d9;
  --pos: #34d399;
  --neg: #fb7185;
  --line: #2c2d4f;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 70% -10%, #2a1b4d 0%, var(--bg) 55%);
  color: var(--ink);
  min-height: 100vh;
}
h1 { font-size: 1.4rem; margin: 0; }
h2 { font-size: 1.1rem; margin: 0; }
h3 { font-size: 0.95rem; margin: 1.2rem 0 0.4rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.muted { color: var(--muted); }
.small { font-size: 0.82rem; }
.pos { color: var(--pos); }
.neg { color: var(--neg); }
.center { text-align: center; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

/* login */
.login-overlay {
  position: fixed; inset: 0; display: grid; place-items: center;
  background: radial-gradient(1000px 500px at 50% 0%, #2a1b4d, var(--bg));
}
.login-card {
  background: var(--card); padding: 2rem; border-radius: 16px; width: min(90vw, 340px);
  display: flex; flex-direction: column; gap: 0.8rem; text-align: center;
  border: 1px solid var(--line); box-shadow: 0 20px 60px rgba(0,0,0,.4);
}
.login-card h1 { font-size: 2rem; }
.error { color: var(--neg); font-size: 0.85rem; margin: 0; }

/* layout */
.topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: 1.2rem clamp(1rem, 4vw, 2.5rem); flex-wrap: wrap;
}
.topbar-actions { display: flex; align-items: center; gap: 0.8rem; }
.you { font-size: 0.85rem; color: var(--muted); display: flex; align-items: center; gap: 0.4rem; }
main { padding: 0 clamp(1rem, 4vw, 2.5rem) 2rem; display: flex; flex-direction: column; gap: 1.2rem; max-width: 1000px; margin: 0 auto; }
footer { text-align: center; padding: 1rem; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 1.1rem 1.2rem 1.3rem; box-shadow: 0 10px 30px rgba(0,0,0,.2);
}
.card-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.results { border-color: var(--accent2); }

/* tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 0.45rem 0.5rem; text-align: left; }
th { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); border-bottom: 1px solid var(--line); }
tbody tr { border-bottom: 1px solid var(--line); }
tbody tr:last-child { border-bottom: none; }

/* inputs */
input, select, button { font: inherit; color: inherit; }
input[type=text], input:not([type]), input[type=number], input[type=password], select {
  background: var(--card2); border: 1px solid var(--line); border-radius: 8px;
  padding: 0.4rem 0.55rem; color: var(--ink); width: 100%; min-width: 0;
}
td input[type=number] { text-align: right; }
input:focus, select:focus { outline: 2px solid var(--accent); border-color: transparent; }
input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--accent); }
input:disabled { opacity: 0.35; }

button {
  cursor: pointer; border: none; border-radius: 8px; padding: 0.45rem 0.8rem;
  background: var(--accent); color: white; font-weight: 600;
}
button:hover { background: var(--accent2); }
button.add { background: var(--accent2); }
button.ghost { background: transparent; border: 1px solid var(--line); color: var(--muted); font-weight: 500; }
button.ghost:hover { background: var(--card2); color: var(--ink); }
button.del { background: transparent; color: var(--muted); padding: 0.2rem 0.5rem; font-size: 0.9rem; }
button.del:hover { background: rgba(251,113,133,.15); color: var(--neg); }

/* stats */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 0.7rem; margin: 0.4rem 0 0.6rem; }
.stat { background: var(--card2); border-radius: 10px; padding: 0.7rem 0.8rem; display: flex; flex-direction: column; gap: 0.15rem; }
.stat-val { font-size: 1.25rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat-label { font-size: 0.72rem; color: var(--muted); }

/* settlement */
.settlement { list-style: none; padding: 0; margin: 0.4rem 0; display: flex; flex-direction: column; gap: 0.4rem; }
.settlement li {
  background: var(--card2); border-radius: 10px; padding: 0.6rem 0.85rem;
  display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap;
}
.settlement .from { font-weight: 600; }
.settlement .arrow { color: var(--accent); font-weight: 700; }
.settlement .to { font-weight: 600; }
.settlement .amt { margin-left: auto; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--pos); }

.settings-row { display: flex; gap: 1.5rem; flex-wrap: wrap; align-items: center; }
.settings-row label { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; color: var(--muted); }

[hidden] { display: none !important; }

/* friend role sees only the out-of-pocket purchases entry */
body.friend .admin-only { display: none !important; }

/* ---- mobile: stack table rows into labeled cards ---- */
@media (max-width: 640px) {
  .topbar { padding: 1rem; }
  .topbar h1 { font-size: 1.2rem; }
  .topbar-actions { width: 100%; justify-content: space-between; }
  .card { padding: 0.9rem 0.9rem 1.1rem; }
  .card-head { flex-wrap: wrap; gap: 0.5rem; }
  .card-head .add { width: 100%; }

  table, thead, tbody, tr, td { display: block; width: 100%; }
  thead { position: absolute; left: -9999px; } /* hide headers, keep for a11y */
  .table-wrap { overflow-x: visible; }

  tbody tr {
    background: var(--card2);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 0.5rem 0.7rem;
    margin-bottom: 0.7rem;
  }
  tbody tr:last-child { margin-bottom: 0; }

  td {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    padding: 0.35rem 0;
    border: none;
    text-align: right;
  }
  td::before {
    content: attr(data-label);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--muted);
    flex: 0 0 auto;
    text-align: left;
  }
  td input:not([type=checkbox]), td select { width: auto; flex: 1 1 auto; min-width: 0; }
  td input[type=checkbox] { flex: 0 0 auto; }
  td.row-actions { justify-content: flex-end; padding-top: 0.2rem; }
  td.row-actions::before { content: none; }
  td.row-actions .del { font-size: 1rem; padding: 0.3rem 0.6rem; }

  .settings-row { flex-direction: column; align-items: stretch; gap: 0.7rem; }
  .settings-row label { justify-content: space-between; }
}