:root {
  --accent: #6d28d9;
  --accent-dark: #5b21b6;
  --bg: #f5f3ff;
  --card: #ffffff;
  --text: #1e1b4b;
  --muted: #6b7280;
  --border: #e5e7eb;
  --ok: #16a34a;
  --danger: #dc2626;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.app-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--accent); color: #fff;
  padding: env(safe-area-inset-top) 0 0;
}
.app-header h1 { margin: 0; padding: 14px 16px; font-size: 1.25rem; }
main { max-width: 640px; margin: 0 auto; padding: 16px 16px calc(24px + env(safe-area-inset-bottom)); }
.card {
  background: var(--card); border-radius: 14px; padding: 16px; margin-bottom: 16px;
  box-shadow: 0 1px 2px rgba(30, 27, 75, 0.06);
}
.card h2 { margin: 0 0 12px; font-size: 1.05rem; }
.field { display: block; margin-bottom: 14px; }
.field-label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 6px; font-weight: 600; }
textarea {
  width: 100%; padding: 12px; font-size: 1rem;
  border: 1px solid var(--border); border-radius: 10px; font-family: inherit; color: var(--text);
}
textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(109, 40, 217, 0.15); }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.log-btn {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 18px 8px; font-size: 1.8rem; border: none; border-radius: 14px;
  background: var(--bg); color: var(--accent-dark); cursor: pointer;
  transition: transform 0.05s ease, background 0.15s ease;
}
.log-btn span { font-size: 0.95rem; font-weight: 700; }
.log-btn:active { transform: scale(0.97); background: #ede9fe; }
.log-btn:disabled { opacity: 0.6; }
.message { margin: 12px 0 0; font-size: 0.9rem; min-height: 1.2em; }
.message.ok { color: var(--ok); }
.message.error { color: var(--danger); }
.recent-list { list-style: none; margin: 0; padding: 0; }
.recent-list li { padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.recent-list li:last-child { border-bottom: none; }
.recent-meta { color: var(--muted); font-size: 0.78rem; margin-top: 2px; }
.empty { color: var(--muted); font-size: 0.9rem; }