:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --text: #1d2330;
  --muted: #5d6676;
  --border: #d8dce3;
  --accent: #0b5cad;
  --accent-text: #ffffff;
  --accent-soft: #e6f0fa;
  --danger: #b3261e;
  --danger-soft: #fdecea;
  --code-bg: #f0f2f5;
  --radius: 10px;
  --gap: 1rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --surface: #1d2128;
    --text: #e7e9ee;
    --muted: #9aa3b2;
    --border: #343a45;
    --accent: #6aa9ec;
    --accent-text: #0d1724;
    --accent-soft: #1e2d3e;
    --danger: #f2a49d;
    --danger-soft: #3a2422;
    --code-bg: #161a20;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--font);
}

.site-header, .layout, .site-footer, .notice {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header { padding-top: 2rem; padding-bottom: 1rem; }
.site-header h1 { margin: 0 0 .25rem; font-size: 1.75rem; }
.site-header p { margin: 0; color: var(--muted); max-width: 65ch; }

.site-footer { color: var(--muted); font-size: .875rem; padding-top: 1rem; padding-bottom: 2rem; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: var(--gap);
  align-items: start;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: var(--gap);
}

.card h2 { margin: 0 0 .75rem; font-size: 1.125rem; }

.sticky { position: sticky; top: 1rem; }
@media (max-width: 900px) { .sticky { position: static; } }

.event-head { display: flex; justify-content: space-between; align-items: center; gap: .5rem; flex-wrap: wrap; }
.event-head h2 { margin: 0; }
.event-tools { display: flex; gap: .5rem; }

label { display: block; margin-bottom: .75rem; font-weight: 500; font-size: .9375rem; }

input[type="text"], input[type="email"], input[type="url"], input[type="date"], input[type="time"],
input[type="number"], select, textarea {
  display: block;
  width: 100%;
  margin-top: .25rem;
  padding: .5rem .625rem;
  font: inherit;
  font-weight: 400;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}

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

textarea { resize: vertical; }

fieldset.location { border: 0; padding: 0; margin: 0 0 .25rem; }
fieldset.location legend { font-weight: 600; padding: 0; margin-bottom: .5rem; }

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 var(--gap); }
.grid-zip { grid-template-columns: minmax(0, 1fr) minmax(0, 3fr); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr) minmax(0, 3fr) minmax(0, 2fr); }
@media (max-width: 640px) {
  .grid, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .grid-zip { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
  .grid-4 { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); }
}

.check { display: inline-flex; align-items: center; gap: .375rem; font-weight: 400; margin-right: .75rem; }
.check input { margin: 0; width: 1.05rem; height: 1.05rem; accent-color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem 0; margin-bottom: .75rem; }

[hidden] { display: none !important; }

details { border-top: 1px solid var(--border); padding-top: .5rem; margin-top: .5rem; }
details > summary { cursor: pointer; font-weight: 600; padding: .25rem 0 .5rem; }
details[open] > summary { margin-bottom: .25rem; }

.hint { color: var(--muted); font-weight: 400; font-size: .875rem; }
.req { color: var(--danger); }
.uid { margin: 0; word-break: break-all; }

code { font-family: var(--mono); font-size: .875em; background: var(--code-bg); padding: .05em .3em; border-radius: 4px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .55rem 1rem;
  font: inherit;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-secondary { background: var(--accent-soft); border-color: transparent; color: var(--text); }
.btn-small { padding: .3rem .65rem; font-size: .875rem; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { border-color: var(--danger); }

.actions { display: grid; gap: .5rem; margin-bottom: .75rem; }

.calendar-links { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-bottom: .5rem; }
.calendar-links:empty { display: none; }

.errors:not(:empty) {
  background: var(--danger-soft);
  color: var(--danger);
  border-radius: 6px;
  padding: .5rem .75rem;
  margin-bottom: .75rem;
  font-size: .9375rem;
}
.errors p { margin: .15rem 0; }

.status { min-height: 1.5em; margin: 0 0 .5rem; color: var(--accent); font-size: .9375rem; }

.notice {
  margin-bottom: var(--gap);
}
.notice:not([hidden]) {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: .75rem 1rem;
  max-width: calc(1200px - 32px);
  width: calc(100% - 32px);
}

pre {
  margin: .5rem 0 0;
  padding: .75rem;
  background: var(--code-bg);
  border-radius: 6px;
  font: .75rem/1.45 var(--mono);
  max-height: 420px;
  overflow: auto;
  white-space: pre;
}