:root {
  --acc: #2d6a6f; --acc2: #5fa8a0; --ink: #22302f;
  --bg: #f2f8f7; --card: #ffffff; --line: #d9e8e4; --sub: #6f8785;
}
* { box-sizing: border-box; }
body { font-family: "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif; margin: 0;
       background: var(--bg); color: var(--ink); line-height: 1.8; font-size: 17px; }
.wrap { max-width: 820px; margin: 0 auto; padding: 0 16px 60px; }
header { background: linear-gradient(135deg, var(--acc), var(--acc2));
         color: #fff; padding: 30px 16px 24px; margin-bottom: 4px;
         border-radius: 0 0 24px 24px; box-shadow: 0 6px 18px rgba(45,106,111,.25); }
header .inner { max-width: 820px; margin: 0 auto; }
header h1 { font-size: 26px; margin: 0 0 6px; letter-spacing: .03em; }
header .catch { font-size: 15px; opacity: .95; margin-bottom: 6px; }
.sub { color: rgba(255,255,255,.85); font-size: 12px; }
nav { display: flex; gap: 8px; flex-wrap: wrap; margin: 20px 0 18px; }
nav a { padding: 9px 16px; border-radius: 999px; background: #fff; color: var(--acc);
        text-decoration: none; font-size: 14px; font-weight: bold; border: 2px solid var(--line); }
nav a.on { background: var(--acc); color: #fff; border-color: var(--acc); }
h2 { font-size: 22px; margin: 22px 0 8px; }
h3 { font-size: 17px; color: var(--acc); margin: 20px 0 8px; }
.desc { color: #567270; font-size: 15px; margin-bottom: 18px; }
.card { background: var(--card); border: 2px solid var(--line); border-radius: 18px; padding: 22px; margin-bottom: 18px; }
.card h3:first-child { margin-top: 0; }
input[type=text], input[type=tel], input[type=number] {
  font-size: 18px; padding: 10px 14px; width: 100%; border: 2px solid var(--line);
  border-radius: 10px; margin: 6px 0 12px; font-family: inherit; }
button { font-size: 16px; padding: 11px 22px; background: var(--acc); color: #fff; border: none;
         border-radius: 999px; font-weight: bold; cursor: pointer; }
button:hover { background: var(--acc2); }
.result { margin-top: 16px; }
.phrase { font-size: 24px; font-weight: bold; color: var(--acc); background: #eaf5f3;
          border-radius: 12px; padding: 14px 18px; margin: 10px 0; word-break: break-all; }
.digitrow { display: flex; gap: 6px; flex-wrap: wrap; margin: 10px 0; }
.dchip { background: #eaf5f3; border: 2px solid var(--line); border-radius: 10px;
         padding: 8px 10px; text-align: center; min-width: 54px; }
.dchip .num { font-size: 20px; font-weight: bold; color: var(--acc); }
.dchip .rd { font-size: 12px; color: var(--sub); }
table.tbl { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 14px; }
table.tbl th, table.tbl td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
table.tbl th { background: #eaf5f3; color: var(--acc); }
.tag { display: inline-block; font-size: 12px; font-weight: bold; background: #eaf5f3; color: var(--acc);
       border-radius: 6px; padding: 3px 10px; margin: 2px 4px 2px 0; }
.qitem { background: var(--card); border: 2px solid var(--line); border-radius: 14px; padding: 16px 18px; margin-bottom: 14px; }
.qitem .qnum { font-size: 13px; font-weight: bold; color: #fff; background: var(--acc);
               display: inline-block; padding: 3px 12px; border-radius: 999px; margin-bottom: 8px; }
.qitem .choices { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.qitem .choices button { background: #fff; color: var(--acc); border: 2px solid var(--line); font-size: 14px; padding: 8px 16px; }
.qitem .choices button.correct { background: #2d6a6f; color: #fff; border-color: #2d6a6f; }
.qitem .choices button.wrong { background: #c9564f; color: #fff; border-color: #c9564f; }
.qitem .exp { display: none; margin-top: 8px; font-size: 14px; color: #567270; }
.foot { color: #8aa3a0; font-size: 12px; text-align: center; margin-top: 40px; }
.note { color: #8aa3a0; font-size: 13px; margin-top: 10px; }
.sister-footer { max-width: 820px; margin: 20px auto 0; padding: 16px 16px 0; border-top: 1px solid var(--line);
  text-align: center; font-size: 12px; color: #8aa3a0; }
.sister-footer .sister-label { display: block; margin-bottom: 8px; font-weight: bold; }
.sister-footer a { color: #8aa3a0; margin: 0 8px; text-decoration: underline; }