:root {
  --bg: #0b0d10;
  --fg: #e6ebf0;
  --muted: #a3adbb;
  --card: #12161c;
  --border: #1e2630;
  --accent: #3b82f6;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 14px/1.45 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

.container {
  max-width: 880px;
  padding: 24px;
  margin: 0 auto;
}

h1 {
  font-size: 24px;
  margin: 0 0 16px;
}

h2 {
  font-size: 18px;
  margin: 0 0 12px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin: 16px 0;
}

.field {
  margin: 12px 0;
}

.field-inline {
  display: flex;
  gap: 8px;
  align-items: center;
}

label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
}

input[type="text"],
input[type="datetime-local"] {
  height: 36px;
  padding: 0 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0e131a;
  color: var(--fg);
  outline: none;
  width: 280px;
}

input[type="text"]:focus,
input[type="datetime-local"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn {
  height: 36px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0e131a;
  color: var(--fg);
  cursor: pointer;
}

.btn:hover {
  border-color: var(--accent);
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.hint {
  color: var(--muted);
  margin-top: 8px;
  font-size: 13px;
}