:root {
  --snow: #f3f5f4;
  --paper: #ffffff;
  --ink: #1c2527;
  --mute: #5e6b6d;
  --line: #d5dedc;
  --pine: #24403d;
  --pine-ink: #ffffff;
  --danger: #9e3b2a;
  --warn-bg: #f6ecd6;
  --warn-ink: #6b4a12;
  --ok-bg: #e2eeea;
  --ok-ink: #1f4a40;
  --radius: 10px;
  font-family: "Gen Interface JP", sans-serif;
  color: var(--ink);
  background: var(--snow);
  -webkit-text-size-adjust: 100%;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; line-height: 1.7; font-size: 15px; }
h1 { font-size: 20px; font-weight: 700; margin: 0 0 4px; letter-spacing: .02em; }
h2 { font-size: 16px; font-weight: 700; margin: 0 0 8px; }
p { margin: 0 0 12px; }
a { color: var(--pine); }

.wrap { max-width: 440px; margin: 0 auto; padding: 24px 18px 40px; }
.muted { color: var(--mute); font-size: 13px; }
.center { text-align: center; }
.stack > * + * { margin-top: 12px; }

.btn {
  display: block; width: 100%; padding: 14px 16px; border-radius: var(--radius);
  font: inherit; font-weight: 700; font-size: 15px; text-align: center; text-decoration: none;
  border: 1px solid var(--pine); background: var(--pine); color: var(--pine-ink); cursor: pointer;
}
.btn.ghost { background: transparent; color: var(--pine); }
.btn.quiet { background: transparent; border-color: var(--line); color: var(--ink); font-weight: 500; }
.btn:disabled { opacity: .5; cursor: progress; }
.btn:focus-visible, input:focus-visible, textarea:focus-visible, label.choice:focus-within {
  outline: 2px solid var(--pine); outline-offset: 2px;
}

.panel { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.note { border-radius: var(--radius); padding: 12px 14px; font-size: 14px; }
.note.warn { background: var(--warn-bg); color: var(--warn-ink); }
.note.ok { background: var(--ok-bg); color: var(--ok-ink); }
.note.err { background: #f7e3de; color: var(--danger); }

.loading { padding: 64px 0; text-align: center; color: var(--mute); }
.spinner {
  width: 28px; height: 28px; margin: 0 auto 12px; border-radius: 50%;
  border: 3px solid var(--line); border-top-color: var(--pine); animation: spin .9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

[hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 3s; }
}