:root {
  --main: #2f3a6b;        /* 藍 */
  --main-2: #232c55;
  --main-soft: #e9ebf5;
  --gold: #b8923c;
  --gold-soft: #f8f1df;
  --ink: #2d2c35;
  --ink-2: #6a6875;
  --paper: #f7f6fb;
  --card: #ffffff;
  --line: #e2e0ec;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Hiragino Maru Gothic ProN', 'Hiragino Sans', 'Yu Gothic UI', 'Yu Gothic', 'Meiryo', sans-serif;
  font-size: 17px;
  line-height: 1.75;
}
main { max-width: 640px; margin: 0 auto; padding: 0 16px 48px; }
[hidden] { display: none !important; }

.hero { text-align: center; padding: 40px 0 24px; }
.eyebrow { margin: 0; color: var(--gold); font-weight: 700; font-size: 15px; letter-spacing: .08em; }
h1 { margin: 6px 0 10px; font-size: 34px; letter-spacing: .06em; color: var(--main); }
.lead { margin: 0; color: var(--ink-2); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
}
h2 { margin: 0 0 8px; font-size: 20px; color: var(--main); }
h3 { margin: 16px 0 4px; font-size: 17px; color: var(--main); }
p { margin: 0 0 10px; }
.note { color: var(--ink-2); font-size: 15px; }
.small { font-size: 14px; }
.err { color: #a44c3c; background: #fbeee9; border-radius: 10px; padding: 8px 12px; font-size: 15px; }

.field { display: block; margin-bottom: 14px; }
.field > span { display: block; font-size: 15px; font-weight: 700; margin-bottom: 4px; }
input[type='date'], input[type='text'] {
  display: block;
  width: 100%;
  min-width: 0;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  appearance: none;
  -webkit-appearance: none;
}
input:focus-visible, button:focus-visible, summary:focus-visible, a:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

.btn {
  display: block;
  width: 100%;
  min-height: 50px;
  padding: 10px 16px;
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  touch-action: manipulation;
}
.btn.primary { background: var(--main); color: #fff; margin-bottom: 10px; }
.btn.ghost { background: var(--main-soft); color: var(--main); }
.btn.line { background: #06c755; color: #fff; margin-top: 10px; }

.tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-bottom: 14px; position: sticky; top: 0; background: var(--paper); padding: 8px 0; z-index: 2; }
.tab {
  min-height: 46px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink-2);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.tab.on { background: var(--main); border-color: var(--main); color: #fff; }

/* 数のカード */
.num-head { display: flex; align-items: center; gap: 14px; margin-bottom: 10px; }
.badge {
  flex: none;
  width: 66px;
  height: 66px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--main);
  color: #fff;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
}
.badge.master { background: var(--gold); }
.badge.small-b { width: 50px; height: 50px; font-size: 22px; }
.num-title { margin: 0; font-size: 19px; font-weight: 700; color: var(--main); line-height: 1.4; }
.num-sub { margin: 0; font-size: 14px; color: var(--ink-2); }
.calc {
  background: var(--main-soft);
  border-radius: 10px;
  padding: 8px 12px;
  margin: 10px 0;
  font-size: 14px;
  color: var(--ink-2);
  overflow-wrap: anywhere;
}
.calc b { color: var(--main); }
.alt { background: var(--gold-soft); border-radius: 10px; padding: 8px 12px; font-size: 14px; }
dl { margin: 8px 0 0; }
dt { font-weight: 700; color: var(--main); font-size: 15px; margin-top: 10px; }
dd { margin: 0; }
.step { background: var(--gold-soft); border-radius: 10px; padding: 8px 12px; margin-top: 12px; }

/* 9年の表 */
.years { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.year { border: 1px solid var(--line); border-radius: 10px; padding: 8px; text-align: center; min-width: 0; }
.year.now { border-color: var(--gold); background: var(--gold-soft); }
.year b { display: block; font-size: 22px; color: var(--main); }
.year span { display: block; font-size: 13px; color: var(--ink-2); line-height: 1.4; }
.year em { display: block; font-style: normal; font-size: 12px; color: var(--ink); line-height: 1.4; }

.period { border-top: 1px solid var(--line); padding: 14px 0 4px; }
.period:first-of-type { border-top: 0; padding-top: 4px; }
.period.now { background: var(--gold-soft); border-radius: 10px; border-top: 0; padding: 12px; margin: 8px 0; }
.period-head { display: flex; gap: 12px; align-items: center; margin-bottom: 6px; }
.tag-now { display: inline-block; background: var(--gold); color: #fff; font-size: 12px; font-weight: 700; padding: 0 8px; border-radius: 99px; margin-left: 6px; }

.share { margin-bottom: 16px; }
.about summary { cursor: pointer; font-weight: 700; color: var(--main); padding: 8px 0; min-height: 44px; }
.rule { border-top: 1px solid var(--line); padding: 10px 0 2px; }
.rule h3 { margin-top: 0; }
.credit { text-align: center; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--main-2);
  color: #fff;
  padding: 10px 18px;
  border-radius: 99px;
  font-size: 15px;
  z-index: 10;
  max-width: calc(100vw - 32px);
}