:root {
  color-scheme: light;
  --ink: #1d2433;
  --muted: #5b6474;
  --surface: #ffffff;
  --canvas: #f5f7fa;
  --border: #dde2ea;
  --accent: #1f4e8c;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar .brand {
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  margin-right: auto;
}

.topbar-user {
  color: var(--muted);
}

.page {
  max-width: 56rem;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.card-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.card-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.notice {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  padding: 1rem 1.25rem;
}

.notice-title {
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.notice-detail {
  color: var(--muted);
  margin: 0;
}

button {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 0.35rem 0.8rem;
  cursor: pointer;
}