:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1f2933;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --debt: #b91c1c;
  --credit: #15803d;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .1);
  --maxw: 1040px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Topbar ---- */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.topbar-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
  height: 58px; display: flex; align-items: center; gap: 24px;
}
.brand { font-weight: 700; font-size: 1.05rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.nav { display: flex; gap: 18px; }
.nav a { color: var(--muted); font-weight: 500; padding: 4px 0; border-bottom: 2px solid transparent; }
.nav a.active { color: var(--text); border-bottom-color: var(--primary); }
.nav a:hover { text-decoration: none; color: var(--text); }
.user { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.user-name { color: var(--muted); font-size: .9rem; }
.logout-form { margin: 0; }
.link-btn { background: none; border: none; color: var(--primary); cursor: pointer; font: inherit; padding: 0; }
.link-btn:hover { text-decoration: underline; }

/* ---- Layout ---- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 28px 20px 64px; }
h1 { font-size: 1.5rem; margin: 0 0 18px; }
h2 { font-size: 1.15rem; margin: 28px 0 12px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.strong { font-weight: 600; }
.breadcrumb { margin: 0 0 12px; }

/* ---- Auth cards ---- */
.auth-card {
  max-width: 380px; margin: 8vh auto 0; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 28px;
}
.auth-card h1 { font-size: 1.3rem; }

/* ---- Forms ---- */
.form { display: flex; flex-direction: column; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 5px; font-size: .9rem; color: var(--muted); }
.field input, .field select {
  font: inherit; color: var(--text); padding: 9px 11px;
  border: 1px solid var(--border); border-radius: 8px; background: #fff;
}
.field input:focus, .field select:focus { outline: 2px solid var(--primary); border-color: var(--primary); }

.btn {
  display: inline-block; font: inherit; font-weight: 500; cursor: pointer;
  padding: 9px 16px; border-radius: 8px; border: 1px solid var(--border);
  background: #fff; color: var(--text); text-align: center;
}
.btn:hover { text-decoration: none; border-color: #cbd5e1; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--muted); }

/* ---- Filters ---- */
.filters {
  display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; margin-bottom: 18px;
}
.filters-actions { display: flex; gap: 8px; margin-left: auto; }

/* ---- Alerts ---- */
.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: .92rem; }
.alert-error { background: #fef2f2; color: var(--debt); border: 1px solid #fecaca; }

/* ---- Tables ---- */
.table-meta { color: var(--muted); font-size: .85rem; margin-bottom: 8px; }
.table-wrap {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
table.data { width: 100%; border-collapse: collapse; font-size: .92rem; }
table.data th, table.data td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--border); }
table.data thead th { background: #f8fafc; color: var(--muted); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .02em; }
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr:hover { background: #f8fafc; }
table.data .num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
table.data.compact th, table.data.compact td { padding: 8px 14px; }
.route { color: var(--text); }
.route .arrow { color: var(--muted); margin: 0 6px; }
.empty { text-align: center; color: var(--muted); padding: 28px; }
.row-link { font-weight: 600; }

/* ---- Badges ---- */
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: .8rem; font-weight: 600; }
.badge-accepted  { background: #eff6ff; color: #1d4ed8; }
.badge-assigned  { background: #fefce8; color: #a16207; }
.badge-completed { background: #f0fdf4; color: var(--credit); }
.badge-draft     { background: #f1f5f9; color: var(--muted); }

/* ---- Detail ---- */
.detail-head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.detail-head h1 { margin: 0; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; margin-bottom: 16px; box-shadow: var(--shadow);
}
.card h2 { margin: 0 0 12px; font-size: 1rem; }
dl.kv { display: grid; grid-template-columns: 160px 1fr; gap: 8px 16px; margin: 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; }

/* ---- Balance ---- */
.balance-summary {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); margin-bottom: 8px;
}
.balance-total { display: flex; align-items: baseline; gap: 14px; margin-bottom: 14px; }
.balance-word { color: var(--muted); font-size: .95rem; }
.balance-amount { font-size: 1.7rem; font-weight: 700; }
.balance-debt .balance-amount { color: var(--debt); }
.balance-credit .balance-amount { color: var(--credit); }
.balance-tag { font-size: .82rem; }
.balance-tag.balance-debt { color: var(--debt); }
.balance-tag.balance-credit { color: var(--credit); }
.amount-neg { color: var(--debt); }
.amount-pos { color: var(--credit); }

/* ---- Pager ---- */
.pager { display: flex; align-items: center; gap: 16px; margin-top: 16px; justify-content: center; }
.pager-link { padding: 6px 12px; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.pager-link:hover { text-decoration: none; border-color: #cbd5e1; }
.pager-link.disabled { color: #cbd5e1; pointer-events: none; }
.pager-info { color: var(--muted); font-size: .88rem; }

@media (max-width: 640px) {
  .nav { gap: 12px; }
  .user-name { display: none; }
  dl.kv { grid-template-columns: 1fr; gap: 2px 0; }
  dl.kv dd { margin-bottom: 8px; }
  .filters-actions { margin-left: 0; }
}