:root {
  --bg: #f6f4ef;
  --card: #ffffff;
  --text: #2c2c2a;
  --muted: #77756e;
  --border: #e3e0d8;
  --accent: #2f6f4f;
  --accent-dark: #24573e;
  --danger: #b3402f;
  --pos: #2f6f4f;
  --neg: #b3402f;
  --warn-bg: #faf0d7;
  --ok-bg: #e4f0e6;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.5;
}

.topbar { background: var(--card); border-bottom: 1px solid var(--border); }
.nav {
  max-width: 860px; margin: 0 auto; padding: 8px 14px;
  display: flex; align-items: center; gap: 6px 14px; flex-wrap: wrap;
  font-size: 0.95rem;
}
.brand { font-weight: 700; text-decoration: none; color: var(--text); white-space: nowrap; }
.nav-links { display: flex; gap: 12px; flex: 1; flex-wrap: wrap; }
.nav-links a { text-decoration: none; color: var(--muted); font-weight: 500; }
.nav-links a:hover { color: var(--text); }
.nav-user { display: flex; gap: 8px; align-items: center; margin-left: auto; }
@media (max-width: 620px) {
  .nav-links { order: 3; width: 100%; justify-content: space-between; gap: 8px; }
}
.nav-user a { text-decoration: none; }
.who { font-weight: 600; color: var(--accent); }

.container { max-width: 860px; margin: 0 auto; padding: 16px; }

h1 { font-size: 1.5rem; margin: 8px 0 16px; }
h2 { font-size: 1.05rem; margin: 0 0 10px; }
a { color: var(--accent); }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; margin-bottom: 16px;
}

.muted { color: var(--muted); font-size: 0.92em; }
.mt { margin-top: 12px; }
.ok { color: var(--pos); font-weight: 600; }
.pos { color: var(--pos); font-weight: 600; }
.neg { color: var(--neg); font-weight: 600; }

.flash { padding: 10px 14px; border-radius: 10px; margin-bottom: 16px; background: var(--ok-bg); }
.flash-error { background: #f7e2de; }
.flash-warning { background: var(--warn-bg); }

.btn {
  display: inline-block; padding: 10px 16px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  font-size: 0.95rem; font-weight: 600; cursor: pointer; text-decoration: none;
}
.btn:hover { border-color: var(--muted); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn-danger { color: var(--danger); border-color: var(--danger); background: var(--card); }
.btn-block { width: 100%; }
.btn-small { padding: 4px 10px; font-size: 0.85rem; }
.btn-tiny { padding: 2px 8px; font-size: 0.78rem; font-weight: 500; color: var(--muted); }
.btn-link { border: none; background: none; color: var(--muted); text-decoration: underline; }
.btn-member { padding: 16px; font-size: 1.05rem; }

input, select, textarea {
  font: inherit; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 10px; background: #fff; width: 100%; margin-top: 4px;
}
label { display: block; margin-bottom: 12px; font-weight: 500; }
form.inline { display: inline; }
form.inline input, form.inline select { width: auto; }
.inline-form { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.inline-form input, .inline-form select { width: auto; margin-top: 0; }
.inline-form input[type="number"], .days-input { width: 76px; }

.expense-form { display: grid; grid-template-columns: 1fr; gap: 8px; margin-top: 12px; }
.expense-form input { margin-top: 0; }
@media (min-width: 640px) {
  .expense-form { grid-template-columns: 150px 1fr 110px auto; }
}

.list { list-style: none; margin: 0; padding: 0; }
.list li {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 8px 0; border-bottom: 1px solid var(--border);
}
.list li:last-child { border-bottom: none; }
.list li > span:first-child { flex: 1; min-width: 140px; }
.amount { font-variant-numeric: tabular-nums; font-weight: 600; white-space: nowrap; }

.badge {
  font-size: 0.78rem; padding: 2px 10px; border-radius: 999px;
  background: var(--warn-bg); color: #7a5c14; font-weight: 600; white-space: nowrap;
}
.badge-ok { background: var(--ok-bg); color: var(--accent-dark); }
.badge-warn { background: var(--warn-bg); color: #7a5c14; }
.pill { font-size: 0.85rem; color: var(--muted); font-weight: 500; margin-left: 6px; }

.month-nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.month-nav h1 { margin: 8px 0; text-align: center; flex: 1; }
.month-nav > span { width: 44px; }

.month-picker { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; justify-content: center; }
.month-picker select { width: auto; margin-top: 0; }

.sep { border: none; border-top: 1px solid var(--border); margin: 14px 0; }
.nowrap { white-space: nowrap; }

.big-number { font-size: 1.6rem; font-weight: 700; margin: 4px 0; }

.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 16px; }
@media (min-width: 640px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stat {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 10px 14px; display: flex; flex-direction: column;
}
.stat-label { font-size: 0.78rem; color: var(--muted); }
.stat-value { font-size: 1.25rem; font-weight: 700; font-variant-numeric: tabular-nums; }

.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th.num, td.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tfoot th { border-top: 2px solid var(--border); }
.row-muted { color: var(--muted); }

.payments { list-style: none; margin: 0; padding: 0; }
.payment { padding: 12px 0; border-bottom: 1px solid var(--border); }
.payment:last-child { border-bottom: none; }
.payment-done { opacity: 0.65; }
.payment-row { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; }
.payment-status { display: flex; gap: 12px; align-items: center; margin-top: 6px; flex-wrap: wrap; font-size: 0.9rem; }

.progress { height: 8px; background: var(--bg); border-radius: 999px; margin: 10px 0 6px; overflow: hidden; }
.progress-bar { height: 100%; background: var(--accent); border-radius: 999px; }

.legend-box { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; }

.auth-box { max-width: 420px; margin: 8vh auto 0; background: var(--card);
  border: 1px solid var(--border); border-radius: 16px; padding: 28px; }
.auth-box h1 { text-align: center; }
.member-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

details summary { cursor: pointer; color: var(--accent); font-weight: 500; margin-top: 8px; }

/* --- Form validation --- */
input.is-valid { border-color: var(--pos); background: #f0faf4; }
input.is-invalid { border-color: var(--danger); background: #fef7f6; animation: shake 0.3s; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-3px); }
  75% { transform: translateX(3px); }
}

/* --- Nudge button --- */
.btn-nudge {
  padding: 2px 8px; font-size: 0.75rem; font-weight: 500;
  border: 1px solid var(--muted); border-radius: 999px;
  background: var(--card); color: var(--muted); cursor: pointer;
  white-space: nowrap;
}
.btn-nudge:hover { border-color: var(--accent); color: var(--accent); }
.nudge-done { color: var(--pos) !important; border-color: var(--pos) !important; }

/* --- Reminder banner --- */
.reminder-banner {
  background: var(--warn-bg); border: 1px solid #e0cc8e; border-radius: 10px;
  padding: 10px 14px; margin-bottom: 12px; font-size: 0.92em;
}