:root {
  --bg: #f4f6fa;
  --panel: #ffffff;
  --text: #1b2430;
  --muted: #5d6b7e;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: #e8effc;
  --border: #dfe5ee;
  --danger: #dc2626;
  --code-bg: #0f172a;
  --code-text: #dbe4f1;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 8px 24px -12px rgba(16, 24, 40, 0.12);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  padding: 24px 16px 48px;
}

.wrap { max-width: 1080px; margin: 0 auto; }

header { text-align: center; margin: 8px 0 24px; }
header h1 { margin: 0 0 8px; font-size: 30px; letter-spacing: -0.02em; }
header p { margin: 0 auto; max-width: 660px; color: var(--muted); }
.badge {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent-strong);
  border: 1px solid #c7d8f7;
  border-radius: 999px;
  padding: 2px 12px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}
@media (max-width: 920px) { main { grid-template-columns: 1fr; } }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.panel h2 { margin: 0 0 14px; font-size: 16px; }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  color: inherit;
  background: #fff;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
textarea { resize: vertical; }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .field-row { grid-template-columns: 1fr; } }

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  margin: 2px 0 14px;
  cursor: pointer;
}
.check input { width: 16px; height: 16px; accent-color: var(--accent); }

.form-actions { display: flex; align-items: center; gap: 12px; margin-top: 16px; flex-wrap: wrap; }

.btn {
  font: inherit;
  font-weight: 600;
  padding: 9px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.btn:hover { border-color: #c9d3e2; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-strong); }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.toolbar-buttons { display: flex; gap: 8px; flex-wrap: wrap; }

#event-list { list-style: none; margin: 0 0 14px; padding: 0; }
#event-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: #fbfcfe;
}
#event-list .event-info { min-width: 0; }
#event-list strong { display: block; font-size: 14px; }
#event-list small {
  color: var(--muted);
  font-size: 12.5px;
  display: block;
  margin-top: 2px;
  overflow-wrap: anywhere;
}
#event-list .btn { flex: none; padding: 6px 10px; font-size: 13px; }
#event-list .empty { color: var(--muted); font-size: 13px; padding: 8px 2px; }

details { margin-top: 6px; }
summary { cursor: pointer; font-size: 14px; font-weight: 600; color: var(--muted); }
summary:hover { color: var(--text); }
pre {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 10px;
  padding: 14px;
  overflow: auto;
  font: 12px/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  margin: 10px 0 0;
  max-height: 340px;
  white-space: pre;
}

.status-msg { font-size: 13px; color: var(--muted); }
.status-msg.error { color: var(--danger); }

footer { text-align: center; color: var(--muted); font-size: 13px; margin-top: 28px; }
footer a { color: var(--accent); }

[hidden] { display: none !important; }