:root {
  --terracotta: #b3552f;
  --terracotta-dark: #8f4224;
  --kinari: #f8f4ee;
  --paper: #fffdf9;
  --ink: #3a2e28;
  --sub: #7a6a5e;
  --line: #ddcdb9;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--kinari);
  color: var(--ink);
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  font-size: 16px;
  line-height: 1.85;
}

.practice-bar {
  background: var(--ink);
  color: var(--kinari);
  font-size: 12px;
  text-align: center;
  padding: 6px 16px;
  letter-spacing: 0.04em;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.site-header .inner {
  max-width: 640px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.logo {
  font-family: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--terracotta);
  text-decoration: none;
  letter-spacing: 0.08em;
}

.logo-sub { font-size: 12px; color: var(--sub); }

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 20px 48px;
}

.hero {
  padding: 36px 0 28px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--terracotta);
  letter-spacing: 0.08em;
}

h1, h2, h3 {
  font-family: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  line-height: 1.5;
  margin: 0;
}

h1 { font-size: 26px; }

h2 {
  font-size: 20px;
  margin: 40px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--terracotta);
}

h3 { font-size: 17px; margin: 24px 0 6px; }

p { margin: 0 0 14px; }

.lead { margin-top: 16px; font-size: 17px; }

ul.plain { margin: 0 0 14px; padding-left: 1.2em; }
ul.plain li { margin-bottom: 6px; }

table.spec {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  font-size: 15px;
}

table.spec th, table.spec td {
  border-bottom: 1px solid var(--line);
  padding: 12px 10px;
  text-align: left;
  vertical-align: top;
}

table.spec th {
  width: 7em;
  color: var(--sub);
  font-weight: 600;
  white-space: nowrap;
}

.voice {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 16px 18px;
  margin: 0 0 12px;
}

.voice p { margin: 0; }
.voice .who { margin-top: 6px; font-size: 13px; color: var(--sub); }

.notice {
  background: var(--paper);
  border: 1px solid var(--terracotta);
  padding: 14px 16px;
  margin: 20px 0;
  font-size: 15px;
}

.notice strong { color: var(--terracotta-dark); }

.btn {
  display: block;
  width: 100%;
  margin: 24px 0 8px;
  padding: 16px 20px;
  background: var(--terracotta);
  color: #fff;
  border: none;
  font-size: 17px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  letter-spacing: 0.06em;
  cursor: pointer;
  font-family: inherit;
}

.btn:hover, .btn:focus { background: var(--terracotta-dark); }

.btn.secondary {
  background: var(--paper);
  color: var(--terracotta);
  border: 1px solid var(--terracotta);
}

.btn-note { margin: 0; font-size: 13px; color: var(--sub); text-align: center; }

.links { margin: 28px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.links li { border-bottom: 1px solid var(--line); }
.links a {
  display: block;
  padding: 14px 4px;
  color: var(--ink);
  text-decoration: none;
}
.links a::after { content: "›"; float: right; color: var(--terracotta); }

/* フォーム */
form { margin-top: 8px; }

fieldset { border: none; margin: 0 0 24px; padding: 0; }

legend, label.field {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
}

.req, .opt {
  display: inline-block;
  margin-left: 6px;
  padding: 0 6px;
  font-size: 11px;
  font-weight: 700;
  vertical-align: 2px;
}
.req { background: var(--terracotta); color: #fff; }
.opt { border: 1px solid var(--line); color: var(--sub); }

input[type="text"], textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--paper);
  font-size: 16px;
  font-family: inherit;
  color: var(--ink);
}

textarea { min-height: 110px; resize: vertical; }

.choice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  margin-bottom: 6px;
  background: var(--paper);
  border: 1px solid var(--line);
  cursor: pointer;
}

.choice input { width: 18px; height: 18px; accent-color: var(--terracotta); }

.error { color: var(--terracotta-dark); font-size: 14px; margin: 6px 0 0; display: none; }
.error.show { display: block; }

.done { display: none; padding: 28px 0; }
.done.show { display: block; }

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper);
  font-size: 12px;
  color: var(--sub);
}

.site-footer .inner { max-width: 640px; margin: 0 auto; padding: 20px; }
.site-footer p { margin: 0 0 6px; }