/* airisk.jp — AI災害対策 学習サイト */
:root {
  --navy: #1f2a44; --red: #d7263d; --orange: #f49d37; --teal: #1b998b; --teal-dark: #0f6e63;
  --bg: #ffffff; --tint: #f1f4f9; --yellow: #fff4d6; --green: #e6f4f1; --pink: #fdecee;
  --muted: #4a5568; --line: #d5dbe6; --radius: 14px; --max: 1080px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--navy);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", "Noto Sans JP", sans-serif;
  font-size: 17px; line-height: 1.8; font-weight: 500;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--teal-dark); }
a:focus-visible, button:focus-visible, input:focus-visible, label:focus-within { outline: 3px solid var(--orange); outline-offset: 2px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 8px; top: 8px; background: #fff; padding: 8px 12px; z-index: 100; }

/* header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--navy); font-weight: 800; font-size: 20px; }
.brand img { width: 40px; height: 40px; }
.brand small { display: block; font-size: 12px; color: var(--muted); font-weight: 600; line-height: 1.2; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--navy); font-weight: 700; font-size: 15px; padding: 8px 12px; border-radius: 999px; }
.nav a:hover { background: var(--tint); }
.nav a[aria-current="page"] { background: var(--navy); color: #fff; }
.nav a.cta { background: var(--red); color: #fff; }

/* language switch */
.lang { display: inline-flex; border: 2px solid var(--navy); border-radius: 999px; overflow: hidden; flex: none; }
.lang a { text-decoration: none; color: var(--navy); font-weight: 800; font-size: 14px; padding: 6px 14px; line-height: 1.4; }
.lang a[aria-current="true"] { background: var(--navy); color: #fff; }
.lang a:not([aria-current]):hover { background: var(--tint); }
html[lang="en"] body { font-family: "Helvetica Neue", Helvetica, Arial, "Segoe UI", system-ui, sans-serif; line-height: 1.65; }
html[lang="en"] .row { grid-template-columns: 240px 1fr; }
html[lang="en"] .bar { grid-template-columns: 230px 1fr 56px; }

/* hero */
.hero { padding: 48px 0 32px; }
.hero .wrap { display: grid; grid-template-columns: 1.3fr 1fr; gap: 32px; align-items: center; }
.hero h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.3; margin: 0 0 12px; font-weight: 900; }
.hero h1 em { font-style: normal; color: var(--red); }
.hero p.lead { font-size: 19px; color: var(--muted); margin: 0 0 24px; }
.hero-art { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; border: 2px solid var(--navy); background: #fff; color: var(--navy);
  font: inherit; font-weight: 800; font-size: 17px; padding: 12px 22px; border-radius: 999px; text-decoration: none; cursor: pointer;
}
.btn:hover { background: var(--tint); }
.btn.primary { background: var(--red); border-color: var(--red); color: #fff; }
.btn.primary:hover { background: #b81e32; }
.btn.teal { background: var(--teal-dark); border-color: var(--teal-dark); color: #fff; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

/* sections */
section { padding: 40px 0; }
section.alt { background: var(--tint); }
h2 { font-size: clamp(24px, 3.4vw, 32px); line-height: 1.4; margin: 0 0 8px; font-weight: 900; }
h3 { font-size: 20px; margin: 0 0 6px; font-weight: 800; line-height: 1.5; }
.sub { color: var(--muted); margin: 0 0 24px; }
.page-title { padding: 36px 0 8px; }
.page-title .wrap { display: flex; align-items: center; gap: 20px; }
.page-title img { width: 96px; height: 96px; flex: none; }
.page-title h1 { font-size: clamp(26px, 4vw, 38px); margin: 0; line-height: 1.35; font-weight: 900; }
.page-title p { margin: 4px 0 0; color: var(--muted); }

.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
section.alt .card { border-color: transparent; }
.card.tint { background: var(--tint); border-color: transparent; }
.card.icon { display: grid; grid-template-columns: 72px 1fr; gap: 16px; align-items: start; }
.card.icon img { width: 72px; height: 72px; }
.card p { margin: 0; }
.stat { text-align: center; }
.stat b { display: block; font-size: 40px; line-height: 1.2; font-weight: 900; }
.stat span { color: var(--muted); font-size: 15px; display: block; line-height: 1.6; }
.note { background: var(--yellow); border-radius: var(--radius); padding: 16px 20px; font-weight: 700; }
.small { font-size: 14px; color: var(--muted); }

/* timeline + rows */
.rows { display: grid; gap: 10px; }
.row { display: grid; grid-template-columns: 210px 1fr; gap: 10px; }
.row > b { color: #fff; border-radius: var(--radius); padding: 14px; display: flex; align-items: center; justify-content: center; text-align: center; line-height: 1.4; }
.row > div { background: var(--tint); border-radius: var(--radius); padding: 14px 18px; }
section.alt .row > div { background: #fff; }
.c-teal { background: var(--teal-dark); } .c-orange { background: #b86a0b; } .c-red { background: var(--red); } .c-navy { background: var(--navy); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.two-col .head { color: #fff; font-weight: 800; text-align: center; border-radius: var(--radius); padding: 8px; }
.two-col .issue { background: var(--pink); border-radius: var(--radius); padding: 14px 18px; }
.two-col .fix { background: var(--green); border-radius: var(--radius); padding: 14px 18px; }

/* quiz */
.quiz-shell { max-width: 820px; margin: 0 auto; }
.mode-cards label { display: block; cursor: pointer; }
.mode-cards input { position: absolute; opacity: 0; }
.mode-cards .card { height: 100%; border-width: 2px; }
.mode-cards input:checked + .card { border-color: var(--red); background: var(--pink); }
.field { display: block; font-weight: 800; margin: 16px 0 6px; }
input[type=text] { width: 100%; font: inherit; padding: 12px 14px; border: 2px solid var(--line); border-radius: 10px; }
.progress { height: 12px; background: var(--tint); border-radius: 999px; overflow: hidden; margin: 8px 0 20px; }
.progress i { display: block; height: 100%; width: 0; background: var(--teal); transition: width .25s; }
.q-meta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 12px; }
.badge { background: var(--navy); color: #fff; font-weight: 800; border-radius: 10px; padding: 4px 14px; }
.chip { background: var(--yellow); font-weight: 700; border-radius: 10px; padding: 4px 12px; font-size: 15px; }
.chip.plain { background: var(--tint); }
.scenario { display: grid; grid-template-columns: 1fr 150px; gap: 16px; align-items: center; background: var(--tint); border-radius: var(--radius); padding: 18px 20px; font-size: 18px; font-weight: 700; }
.scenario img { width: 150px; height: 150px; }
.question { color: var(--red); font-size: 21px; font-weight: 900; margin: 20px 0 12px; line-height: 1.5; }
.options { display: grid; gap: 10px; }
.opt { display: grid; grid-template-columns: 40px 1fr; gap: 12px; align-items: center; width: 100%; text-align: left; font: inherit; font-weight: 700; font-size: 17px; color: var(--navy); background: #fff; border: 2px solid var(--navy); border-radius: var(--radius); padding: 12px 14px; cursor: pointer; line-height: 1.5; }
.opt i { font-style: normal; width: 40px; height: 40px; border-radius: 50%; background: var(--navy); color: #fff; display: grid; place-items: center; font-weight: 900; font-family: Arial, sans-serif; }
.opt:hover { background: var(--tint); }
.opt.sel { background: var(--yellow); border-color: var(--orange); }
.opt.ok { background: var(--green); border-color: var(--teal-dark); }
.opt.ok i { background: var(--teal-dark); }
.opt.ng { background: var(--pink); border-color: var(--red); }
.opt.ng i { background: var(--red); }
.opt[disabled] { cursor: default; }
.explain { margin-top: 16px; border-radius: var(--radius); padding: 16px 20px; background: var(--green); }
.explain .point { margin-top: 10px; background: var(--yellow); border-radius: 10px; padding: 10px 14px; font-weight: 700; }
.quiz-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
.jump { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 6px; margin-top: 12px; }
.jump button { font: inherit; font-size: 14px; font-weight: 700; padding: 6px 0; border-radius: 8px; border: 1px solid var(--line); background: #fff; color: var(--navy); cursor: pointer; }
.jump button.done { background: var(--green); border-color: var(--teal); }
.jump button.cur { background: var(--navy); color: #fff; border-color: var(--navy); }

/* result */
.score-hero { text-align: center; border-radius: var(--radius); padding: 28px 16px; }
.score-hero.pass { background: var(--green); } .score-hero.fail { background: var(--pink); }
.score-hero .num { font-size: 72px; font-weight: 900; line-height: 1.1; font-family: Arial, sans-serif; }
.score-hero .num small { font-size: 28px; }
.bars { display: grid; gap: 8px; }
.bar { display: grid; grid-template-columns: 170px 1fr 56px; gap: 10px; align-items: center; font-weight: 700; font-size: 15px; }
.bar .track { background: var(--tint); height: 16px; border-radius: 999px; overflow: hidden; }
.bar .track i { display: block; height: 100%; background: var(--teal); }
.cert-preview { width: 100%; border: 1px solid var(--line); border-radius: 8px; margin-top: 16px; }
details.review { border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; margin-top: 10px; background: #fff; }
details.review summary { cursor: pointer; font-weight: 800; }
.hidden { display: none !important; }

/* footer */
.site-footer { background: var(--navy); color: #dfe5f0; padding: 32px 0; margin-top: 40px; font-size: 15px; }
.site-footer a { color: #fff; }
.site-footer .cols { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; }

@media (max-width: 820px) {
  .site-header { position: static; }
  .site-header .wrap { padding-top: 8px; padding-bottom: 8px; }
  .nav { flex-wrap: nowrap; overflow-x: auto; width: 100%; -webkit-overflow-scrolling: touch; padding-bottom: 4px; }
  .nav a { white-space: nowrap; flex: none; font-size: 14px; padding: 8px 10px; }
  .hero { padding-top: 24px; }
  .nav a.cta { order: -1; }
  body.in-quiz .page-title { display: none; }
  .hero .wrap, .g2, .g3, .g4, .site-footer .cols { grid-template-columns: 1fr; }
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .row, html[lang="en"] .row { grid-template-columns: 1fr; }
  html[lang="en"] .bar { grid-template-columns: 130px 1fr 50px; }
  .site-header .wrap { row-gap: 6px; }
  .brand small { display: none; }
  .two-col { grid-template-columns: 1fr; }
  .two-col .head.fixh { display: none; }
  .scenario { grid-template-columns: 1fr; }
  .scenario img { width: 110px; height: 110px; margin: 0 auto; order: -1; }
  .bar { grid-template-columns: 110px 1fr 50px; font-size: 13px; }
  .page-title img { width: 64px; height: 64px; }
  .hero-art { max-width: 360px; margin: 0 auto; }
}
@media print { .site-header, .site-footer, .quiz-nav, .btns { display: none; } }