:root {
  --bg: #f6f5f1;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #5f6368;
  --line: #dcd9d0;
  --accent: #1d5c4d;
  --accent-ink: #ffffff;
  --warn: #8a5a00;
  --warn-bg: #fff6e0;
  --error: #b42318;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161a19; --card: #1f2423; --text: #e8eae9; --muted: #a3aaa8; --line: #343b39;
    --accent: #5fb39c; --accent-ink: #0c1412; --warn: #f2c46d; --warn-bg: #2e2716; --error: #ff8a80;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif; line-height: 1.75;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
.eyebrow { margin: 0; color: var(--muted); font-size: 13px; letter-spacing: .08em; }
h1 { margin: 4px 0 24px; font-size: 26px; }
h2 { font-size: 20px; margin: 4px 0 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
label { display: block; font-weight: 600; margin: 16px 0 0; }
input, textarea {
  display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
}
textarea { min-height: 84px; resize: vertical; }
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.q { margin: 0 0 22px; }
.q label { margin: 0; }
.hint { display: block; color: var(--muted); font-weight: 400; font-size: 13px; margin-top: 2px; }
button {
  font: inherit; font-weight: 600; padding: 10px 20px; border-radius: 8px; border: 1px solid var(--accent);
  background: var(--accent); color: var(--accent-ink); cursor: pointer;
}
button.secondary { background: transparent; color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
#login-form button { margin-top: 20px; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 8px; }
.saved { color: var(--muted); font-size: 13px; }
.progress { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
#bar { height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.step { color: var(--muted); font-size: 13px; margin: 12px 0 0; }
.warn { background: var(--warn-bg); color: var(--warn); padding: 12px 14px; border-radius: 8px; font-size: 14px; }
.error { color: var(--error); min-height: 1em; margin: 12px 0 0; }