:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5a5a5a;
  --surface: #fafafa;
  --accent: #2a6df4;
  --accent-fg: #ffffff;
  --border: #e2e2e2;
  --danger: #b00020;
  --danger-fg: #ffffff;
  --radius: 6px;
  --max-width: 760px;
  --space: 1rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --fg: #e8e8e8;
    --muted: #a0a4ad;
    --surface: #1b1f26;
    --accent: #6ea0ff;
    --accent-fg: #0b0d10;
    --border: #2a2f38;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header, main, footer {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space);
}

header {
  border-bottom: 1px solid var(--border);
}

header .brand {
  font-weight: 700;
  text-decoration: none;
  color: var(--fg);
  font-size: 1.25rem;
}

main { flex: 1 0 auto; }

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
}

a { color: var(--accent); }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.25; margin-top: 1.25em; }
h1:first-child, h2:first-child, h3:first-child { margin-top: 0; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--surface);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--border);
  word-break: break-all;
}

/* ---------- Forms ---------- */

form { display: flex; flex-direction: column; gap: 0.75rem; }
form.inline { display: inline-block; margin: 0; }

label {
  font-weight: 600;
  display: block;
}

input, textarea, select {
  width: 100%;
  padding: 0.5rem 0.65rem;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

textarea { resize: vertical; }

input:focus, textarea:focus, select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* Radios and checkboxes are intrinsic-size, not full-width. */
input[type="radio"],
input[type="checkbox"] {
  width: auto;
  margin: 0;
  accent-color: var(--accent);
}

/* A label that wraps a radio/checkbox should sit inline with its control. */
label:has(> input[type="radio"]),
label:has(> input[type="checkbox"]) {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 400;
  cursor: pointer;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin: 0;
}

fieldset legend {
  padding: 0 0.4rem;
  font-weight: 600;
}

/* The radio group inside a fieldset lays out as a row that wraps. */
fieldset.choices,
fieldset:has(> label > input[type="radio"]) {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

/* ---------- Buttons ---------- */

button, .button {
  display: inline-block;
  padding: 0.5rem 0.95rem;
  font: inherit;
  font-weight: 600;
  background: var(--accent);
  color: var(--accent-fg);
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  line-height: 1.2;
}

button:hover, .button:hover { filter: brightness(1.08); }

button:focus-visible, .button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button.secondary, .button.secondary,
button[type="submit"][formnovalidate] {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}

button.danger, .button.danger {
  background: transparent;
  color: var(--danger);
  border-color: var(--danger);
}

button.danger:hover, .button.danger:hover {
  background: var(--danger);
  color: var(--danger-fg);
  filter: none;
}

/* When a form has both a submit and a cancel, sit them on a row. */
.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

/* ---------- Page chrome ---------- */

.muted { color: var(--muted); }
.error { color: var(--danger); }

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
}

.page-header h1 { margin: 0; }

.user-strip {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.flash {
  margin: 1rem 0;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.notice {
  margin: 1rem 0;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--muted) 12%, transparent);
}

.errors {
  margin: 1rem 0;
  padding: 0.6rem 0.8rem 0.6rem 1.6rem;
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  color: var(--danger);
}
.errors ul { margin: 0; padding-left: 1rem; }

/* ---------- Event-specific ---------- */

.event-meta { margin: 0.5rem 0 1rem; }
.event-description { margin: 1rem 0; }
.capacity { font-weight: 600; }

.event-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.event-list li {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--border);
}
.event-list li:last-child { border-bottom: 0; }

.event-summary {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  background: var(--surface);
  margin: 1rem 0;
}
.event-summary dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.25rem 1rem;
  margin: 0;
}
.event-summary dt { font-weight: 600; color: var(--muted); }
.event-summary dd { margin: 0; }
.event-summary .actions { margin-top: 0.85rem; display: flex; gap: 0.5rem; flex-wrap: wrap; }

.invite, .attendees, .rsvp { margin-top: 1.5rem; }
.invite p { margin: 0.5rem 0; }

.attendees .add-one {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.5rem;
  align-items: end;
}
.attendees .add-one label {
  grid-column: 1 / -1;
  margin-bottom: 0.1rem;
}
.attendees details { margin-top: 1rem; }
.attendees details summary { cursor: pointer; font-weight: 600; }

ul.roster { padding-left: 1.25rem; }
ul.roster.names-status { list-style: none; padding-left: 0; }
ul.roster.names-status li {
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
}

table.roster {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  font-size: 0.95rem;
}
table.roster th, table.roster td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
table.roster th {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
}
table.roster tr:last-child td { border-bottom: 0; }
table.roster td.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  white-space: nowrap;
}
table.roster .row-actions button {
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
}

.help { font-size: 0.875rem; margin-top: -0.4rem; color: var(--muted); }

@media (max-width: 540px) {
  .attendees .add-one { grid-template-columns: 1fr; }
  .attendees .add-one label { grid-column: auto; }
  .event-summary dl { grid-template-columns: 1fr; }
  .event-summary dt { margin-top: 0.4rem; }
}