:root {
  --fg: #1f2328;
  --muted: #6b7280;
  --bg: #f6f7f9;
  --card: #ffffff;
  --border: #d8dce1;
  --accent: #2f6f4f;
  --accent-fg: #fff;
  --danger: #b42318;
  --ok: #1a7f37;
}
* { box-sizing: border-box; }
body {
  margin: 0; color: var(--fg); background: var(--bg);
  font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
header {
  background: var(--card); border-bottom: 1px solid var(--border);
  padding: 14px 24px;
}
header h1 { margin: 0 0 8px; font-size: 20px; }
header .muted { color: var(--muted); font-weight: 400; font-size: 15px; }
nav a {
  text-decoration: none; color: var(--fg); margin-right: 18px;
  padding-bottom: 4px; border-bottom: 2px solid transparent;
}
nav a.on { border-color: var(--accent); color: var(--accent); font-weight: 600; }
nav a.logout { float: right; color: var(--muted); }
main { max-width: 1400px; margin: 24px auto; padding: 0 24px; }

h2 { font-size: 17px; margin-top: 28px; }
.muted { color: var(--muted); }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 8px; padding: 18px; margin-bottom: 18px;
}
.toolbar { display: flex; gap: 10px; align-items: center; margin: 14px 0; flex-wrap: wrap; }
.spacer { flex: 1; }

button, .btn {
  font: inherit; cursor: pointer; border: 1px solid var(--border);
  background: var(--card); color: var(--fg); padding: 8px 14px;
  border-radius: 6px; text-decoration: none; display: inline-block;
}
button.primary, .btn.primary {
  background: var(--accent); color: var(--accent-fg); border-color: var(--accent);
}
button.danger { color: var(--danger); border-color: #f0c4c0; }
button:hover, .btn:hover { filter: brightness(0.97); }

table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); }
th { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
td input { width: 100%; border: 1px solid transparent; background: transparent;
  padding: 5px 6px; border-radius: 4px; font: inherit; }
td input:focus { border-color: var(--accent); background: #fff; outline: none; }
td.num input { text-align: right; }
.cost-col th { color: var(--accent); }

/* Participant table: width follows content; each column sizes to its fields. */
.table-card { overflow-x: auto; }
#ptable { width: auto; }
#ptable th, #ptable td { white-space: nowrap; }
#ptable td input {
  width: auto;
  min-width: 7ch;
  field-sizing: content;   /* Chrome: input grows/shrinks to its text */
}
#ptable td.num input { min-width: 3ch; max-width: 7ch; }
#ptable td:last-child, #ptable th:last-child { width: 1%; }  /* delete-button column */

label { display: block; font-size: 13px; color: var(--muted); margin: 10px 0 4px; }
input[type=text], input[type=number], input[type=password], textarea, select {
  font: inherit; width: 100%; padding: 8px 10px;
  border: 1px solid var(--border); border-radius: 6px; background: #fff;
}
textarea { min-height: 200px; font-family: ui-monospace, monospace; font-size: 13px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; }
.grid3 { display: grid; grid-template-columns: 2fr 2fr 1fr; gap: 0 18px; }
.inline { display: flex; align-items: center; gap: 8px; }
.inline label { margin: 0; }

.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; }
.flash.success { background: #e7f6ec; color: var(--ok); border: 1px solid #b7e0c2; }
.flash.error { background: #fdeceb; color: var(--danger); border: 1px solid #f4c7c2; }

.preview-mail { border: 1px solid var(--border); border-radius: 8px; background: #fff;
  margin-bottom: 18px; overflow: hidden; }
.preview-mail .head { background: #f0f2f4; padding: 10px 16px; border-bottom: 1px solid var(--border); }
.preview-mail .head b { font-size: 15px; }
.preview-mail .body { padding: 16px; }
.placeholders code { background: #eef1f3; padding: 1px 5px; border-radius: 4px; font-size: 12px; }
.result-ok { color: var(--ok); }
.result-fail { color: var(--danger); }

/* Payments overview */
.summary { display: flex; gap: 14px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
.sumbox { background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 16px; min-width: 180px; }
.sumbox .lbl { display: block; font-size: 12px; color: var(--muted);
  text-transform: uppercase; letter-spacing: .03em; }
.sumbox .val { font-size: 20px; font-weight: 700; }
.sumbox.ok { border-color: #b7e0c2; } .sumbox.ok .val { color: var(--ok); }
.sumbox.open { border-color: #f4c7c2; } .sumbox.open .val { color: var(--danger); }

#paytable th, #paytable td { white-space: nowrap; }
#paytable td.num, #paytable th.num { text-align: right; }
#paytable .paid-col { text-align: center; }
#paytable tfoot td { border-top: 1px solid var(--border); border-bottom: none; }
#paytable tfoot tr:first-child td { border-top: 2px solid var(--border); }
#paytable .paid-sum-row td { color: var(--ok); }
#paytable tr.is-paid td { background: #f1f8f3; }
#paytable .paid-cb { width: 18px; height: 18px; cursor: pointer; }