:root {
  --bg: #f5f6f8;
  --card: #fff;
  --ink: #1c2333;
  --muted: #6b7280;
  --brand: #1f4e79;
  --border: #e3e6ea;
  --ok: #1a7f37;
  --error: #b42318;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.6rem 1.25rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.topbar .brand { font-weight: 700; color: var(--brand); text-decoration: none; font-size: 1.1rem; }
.topbar nav { display: flex; gap: 1rem; flex: 1; }
.topbar nav a { color: var(--ink); text-decoration: none; }
.topbar nav a:hover { color: var(--brand); }
.topbar .logout { color: var(--muted); text-decoration: none; }

main { padding: 1.5rem; max-width: 1000px; margin: 0 auto; }

h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; margin-top: 2rem; }

.btn {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  padding: 0.45rem 0.8rem;
  border-radius: 6px;
  text-decoration: none;
  margin-bottom: 1rem;
}

table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--border); display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
th, td { text-align: left; padding: 0.5rem 0.7rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 0.85rem; white-space: nowrap; }
.nowrap { white-space: nowrap; }
tr:last-child td { border-bottom: none; }

.cards { display: flex; gap: 1rem; flex-wrap: wrap; }
.card {
  flex: 1 1 140px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
}
.card .num { font-size: 1.8rem; font-weight: 700; color: var(--brand); }

.form { display: grid; gap: 0.4rem; max-width: 560px; }
.form label { margin-top: 0.5rem; font-weight: 600; font-size: 0.9rem; }
.form input, .form select, .form textarea {
  padding: 0.45rem; border: 1px solid var(--border); border-radius: 6px; font: inherit;
}
.form .check { font-weight: 400; display: flex; align-items: center; gap: 0.4rem; }
.form button { margin-top: 1rem; background: var(--brand); color: #fff; border: none; padding: 0.5rem 1rem; border-radius: 6px; cursor: pointer; }

.flash { padding: 0.6rem 0.9rem; border-radius: 6px; margin-bottom: 1rem; }
.flash.ok { background: #e6f4ea; color: var(--ok); }
.flash.error { background: #fdecea; color: var(--error); }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
dl { display: grid; grid-template-columns: 160px 1fr; gap: 0.3rem; }
dt { color: var(--muted); }

.note { background: var(--card); border: 1px solid var(--border); border-radius: 6px; padding: 0.5rem 0.7rem; margin: 0.5rem 0; }
.tag { background: #eef2f6; border-radius: 4px; padding: 0.1rem 0.4rem; font-size: 0.75rem; color: var(--muted); }
.inline { display: inline; }
button.link { background: none; border: none; color: var(--muted); text-decoration: underline; cursor: pointer; padding: 0; font: inherit; }

.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-card { background: var(--card); padding: 2rem; border-radius: 10px; width: 320px; border: 1px solid var(--border); }
.login-card h1 { margin-top: 0; }
.login-card form { display: grid; gap: 0.5rem; }
.login-card input { padding: 0.5rem; border: 1px solid var(--border); border-radius: 6px; font: inherit; }
.login-card button { margin-top: 0.8rem; background: var(--brand); color: #fff; border: none; padding: 0.5rem; border-radius: 6px; cursor: pointer; }

.sign-wrap { max-width: 640px; margin: 0 auto; padding: 2rem; }
.btn-ghost { background: transparent; color: var(--brand); border: 1px solid var(--border); cursor: pointer; }

@media (max-width: 640px) {
  main { padding: 1rem; }
  .topbar { flex-wrap: wrap; gap: 0.6rem 0.9rem; padding: 0.6rem 0.9rem; }
  .topbar nav { flex-wrap: wrap; gap: 0.5rem 0.9rem; flex: 1 1 100%; order: 3; }
  .topbar .brand { order: 1; }
  .topbar .logout { order: 2; margin-left: auto; }
  .grid { grid-template-columns: 1fr; gap: 1.25rem; }
  dl { grid-template-columns: 1fr; gap: 0.1rem; }
  .form, .login-card { width: 100%; max-width: 100%; }
  .sign-wrap { padding: 1rem; max-width: 100%; }
  .cards { gap: 0.6rem; }
  .card { flex: 1 1 40%; }
}