:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --ink: #1f2430;
  --muted: #6b7280;
  --line: #dfe3ea;
  --accent: #2f6fed;
  --accent-ink: #ffffff;
  --ok: #0f7b4f;
  --ng: #c0392b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 1rem 3rem;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}

.site-header { max-width: 720px; margin: 0 auto; padding: 2.5rem 0 1.5rem; }
.site-header h1 { margin: 0 0 .4rem; font-size: 1.6rem; }
.lead { margin: 0; color: var(--muted); font-size: .95rem; }

main { max-width: 720px; margin: 0 auto; display: grid; gap: 1.25rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.5rem;
}
.card h2 { margin: 0 0 1rem; font-size: 1.1rem; }

.section-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.section-head h2 { margin: 0; }
.hint { margin: .25rem 0 1rem; color: var(--muted); font-size: .85rem; }

code {
  background: #eef1f6;
  padding: .1em .4em;
  border-radius: 4px;
  font-size: .9em;
}

.field { margin-bottom: 1.1rem; }
.field label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: .35rem; }
.req {
  font-weight: 400; font-size: .72rem; color: var(--ng);
  border: 1px solid currentColor; border-radius: 3px; padding: 0 .3em; vertical-align: 1px;
}

input, select, textarea {
  width: 100%;
  padding: .6rem .7rem;
  font: inherit;
  color: inherit;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
textarea { resize: vertical; }

.counter { margin: .3rem 0 0; text-align: right; font-size: .8rem; color: var(--muted); }

.error { margin: .3rem 0 0; min-height: 1.2em; font-size: .82rem; color: var(--ng); }
.field.invalid input,
.field.invalid select,
.field.invalid textarea { border-color: var(--ng); }

button {
  font: inherit;
  font-weight: 600;
  padding: .65rem 1.4rem;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}
button:hover:not(:disabled) { filter: brightness(1.08); }
button:disabled { opacity: .6; cursor: progress; }

button.ghost {
  background: transparent;
  color: var(--accent);
  padding: .35rem .8rem;
  font-size: .85rem;
  cursor: pointer;
}

.spinner {
  width: 1em; height: 1em;
  border: 2px solid rgba(255,255,255,.45);
  border-top-color: #fff;
  border-radius: 50%;
  display: none;
  animation: spin .7s linear infinite;
}
button.loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

.status { margin: .9rem 0 0; min-height: 1.4em; font-size: .9rem; font-weight: 600; }
.status.ok { color: var(--ok); }
.status.ng { color: var(--ng); }

.message-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .75rem; }
.message-list li {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: .8rem 1rem;
  background: #fbfcfe;
}
.message-list li.empty { color: var(--muted); text-align: center; background: transparent; border-style: dashed; }
.msg-meta { font-size: .8rem; color: var(--muted); display: flex; flex-wrap: wrap; gap: .5rem; }
.msg-cat {
  background: #e7edfb; color: var(--accent);
  border-radius: 999px; padding: 0 .6em; font-weight: 600;
}
.msg-body { margin: .4rem 0 0; white-space: pre-wrap; word-break: break-word; }

.site-footer {
  max-width: 720px; margin: 2rem auto 0;
  text-align: center; font-size: .85rem; color: var(--muted);
}
.site-footer a { color: var(--accent); }

/* ---- ログイン画面 ---- */
.login-page { display: flex; align-items: center; min-height: 100vh; padding: 2rem 1rem; }
.login-wrap { width: 100%; max-width: 380px; margin: 0 auto; }
.login-card h1 { margin: 0 0 .2rem; font-size: 1.35rem; }
.login-card .lead { margin: 0 0 1.5rem; }
.login-card .field:last-of-type { margin-bottom: 1.4rem; }

button.block { width: 100%; justify-content: center; }

.alert {
  margin: 0 0 1.2rem;
  padding: .6rem .8rem;
  border: 1px solid var(--ng);
  border-radius: 8px;
  background: #fdf0ee;
  color: var(--ng);
  font-size: .88rem;
  font-weight: 600;
}

/* ---- ログイン中のユーザーバー ---- */
.userbar {
  display: flex; align-items: center; justify-content: flex-end; gap: .75rem;
  margin-bottom: .75rem; font-size: .85rem; color: var(--muted);
}
.userbar form { margin: 0; }