/* IASO Radium Thoron | Tablet 768px-1180px */

:root {
    --radium-navy: #183247;
    --radium-blue: #6e9db8;
    --radium-blue-light: #dceaf1;
    --radium-ivory: #f8f7f3;
    --radium-text: #334652;
    --radium-muted: #6f808a;
    --radium-line: #dbe4e9;
    --radium-white: #ffffff;
}

.RadiumMain { background: var(--radium-white); color: var(--radium-text); overflow: hidden; }
.RadiumMain *, .RadiumMain *::before, .RadiumMain *::after { box-sizing: border-box; }

.RadiumHero { position: relative; isolation: isolate; height: 590px; min-height: 590px; display: flex; align-items: center; overflow: hidden; background: var(--radium-ivory); 
    max-height: 590px;}
.RadiumHero__media, .RadiumHero__media picture, .RadiumHero__media img { position: absolute; inset: 0; display: block; width: 100%; height: 100%; }
.RadiumHero__media img { object-fit: cover; object-position: 57% center; }
.RadiumHero__veil { position: absolute; inset: 0; z-index: 1; background: linear-gradient(90deg, rgba(248,247,243,.98) 0%, rgba(248,247,243,.91) 50%, rgba(248,247,243,.45) 78%, rgba(248,247,243,.08) 100%); }
.RadiumHero__inner, .RadiumInner, .RadiumCta__inner { position: relative; z-index: 2; width: calc(100% - 72px); max-width: 1040px; margin: 0 auto; }
.RadiumHero__inner { padding: 0; 
    position: relative;
    z-index: 2;
    width: calc(100% - 72px);
    max-width: 1040px;
    height: 100%;
    min-height: 0;
    max-height: none;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;}
.RadiumHero__inner > * {
    width: 60%;
    max-width: 650px;
}


.RadiumEyebrow { margin: 0 0 18px; color: var(--radium-blue); font-size: 11px; font-weight: 600; letter-spacing: .2em; line-height: 1.4; }
.RadiumHero__title, .RadiumSectionTitle, .RadiumResearch__title, .RadiumSafety__title, .RadiumSources__title, .RadiumCta__title { color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 500; }
.RadiumHero__title {  margin: 0;
    font-size: 40px;
    letter-spacing: .04em;
    line-height: 1.5;
    font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
    font-weight: 500;
}
.RadiumHero__subTitle { margin: 14px 0 0; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: 22px; font-weight: 500; letter-spacing: .065em; line-height: 1.75; }
.RadiumHero__lead { margin: 24px 0 0; color: var(--radium-navy); font-size: 19px; font-weight: 500; line-height: 1.9; }
.RadiumHero__text { max-width: 630px; margin: 22px 0 0; color: #4c606d; font-size: 14px; line-height: 2.1; }


/* Page guide */
.RadiumIndex{border-top:1px solid var(--radium-line);border-bottom:1px solid var(--radium-line);background:#fff}
.RadiumIndex .RadiumInner{width:100%;max-width:none;margin:0;padding:0}
.RadiumIndex__links{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));counter-reset:radium-index}
.RadiumIndex__links a{position:relative;display:flex;min-height:74px;align-items:center;justify-content:center;gap:9px;padding:18px 12px;border-right:1px solid var(--radium-line);border-bottom:1px solid var(--radium-line);color:var(--radium-navy);font-size:10.5px;font-weight:500;line-height:1.55;text-align:center;text-decoration:none;transition:background-color .28s ease,color .28s ease,box-shadow .28s ease}
.RadiumIndex__links a:nth-child(4n){border-right:0}
.RadiumIndex__links a:nth-last-child(-n+4){border-bottom:0}
.RadiumIndex__links a::before{counter-increment:radium-index;content:counter(radium-index,decimal-leading-zero);color:var(--radium-blue);font-family:Georgia,"Times New Roman",serif;font-size:11px;font-weight:400;line-height:1;transition:color .28s ease}
@media (hover:hover) and (pointer:fine){
    .RadiumIndex__links a:hover{background-color:rgba(110,157,184,.075);color:inherit;box-shadow:inset 0 -2px 0 rgba(110,157,184,.34)}
    .RadiumIndex__links a:hover::before{color:#5f91ad}
}
.RadiumIndex__links a:focus-visible{outline:1px solid rgba(110,157,184,.72);outline-offset:-4px;background-color:rgba(110,157,184,.055)}
@media (max-width:900px){
    .RadiumIndex__links{grid-template-columns:repeat(2,minmax(0,1fr))}
    .RadiumIndex__links a:nth-child(4n){border-right:1px solid var(--radium-line)}
    .RadiumIndex__links a:nth-child(2n){border-right:0}
    .RadiumIndex__links a:nth-last-child(-n+4){border-bottom:1px solid var(--radium-line)}
    .RadiumIndex__links a:nth-last-child(-n+2){border-bottom:0}
}

.RadiumQuick { padding: 76px 0; background: #fff; border-bottom: 1px solid var(--radium-line); }
.RadiumQuick__grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 42px; align-items: center; }
.RadiumQuick__title { margin: 0 0 22px; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 27px; font-weight: 500; letter-spacing: .035em; line-height: 1.75; }
.RadiumQuick__visual { margin: 0; overflow: hidden; }
.RadiumQuick__visual img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.RadiumQuick__points { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.RadiumQuick__points span { padding: 7px 10px; border: 1px solid var(--radium-line); color: #647781; font-size: 10px; line-height: 1.6; }

.RadiumSection { padding: 96px 0; }
.RadiumIntro, .RadiumHistory, .RadiumFlow { background: var(--radium-ivory); }
.RadiumExperience, .RadiumSources { background: #f5f9fb; }
.RadiumSectionHead { max-width: 700px; margin: 0 0 48px; }
.RadiumSectionHead--center { margin: 0 auto 48px; text-align: center; }
.RadiumSectionTitle, .RadiumSources__title { margin: 0; font-size: 32px; letter-spacing: .04em; line-height: 1.65; }
.RadiumSectionLead { margin: 22px 0 0; color: var(--radium-muted); font-size: 14px; line-height: 2; }
.RadiumLead { margin: 0 0 22px; color: var(--radium-navy); font-size: 17px; line-height: 2; }
.RadiumText { margin: 0 0 20px; color: var(--radium-text); font-size: 14px; line-height: 2.1; }
.RadiumText strong { color: var(--radium-navy); }

.RadiumIntro__head { max-width: 700px; margin-bottom: 44px; }
.RadiumIntro__signature { display: grid; grid-template-columns: minmax(0,1.15fr) minmax(270px,.85fr); gap: 44px; align-items: end; padding: 42px 0; border-top: 1px solid var(--radium-line); border-bottom: 1px solid var(--radium-line); }
.RadiumIntro__kicker, .RadiumIntro__halfLifeLabel { display: block; margin: 0 0 14px; color: var(--radium-blue); font-size: 10px; font-weight: 600; letter-spacing: .16em; }
.RadiumIntro__nuclide { margin: 0; color: var(--radium-navy); font-family: Georgia, serif; font-size: 74px; line-height: 1; }
.RadiumIntro__definitionText { margin: 24px 0 0; color: var(--radium-navy); font-size: 16px; line-height: 2; }
.RadiumIntro__halfLife { padding-left: 32px; border-left: 1px solid var(--radium-line); }
.RadiumIntro__halfLife strong { display: inline-block; color: var(--radium-navy); font-family: Georgia, serif; font-size: 66px; font-weight: 400; line-height: 1; }
.RadiumIntro__halfLifeUnit { margin-left: 6px; color: var(--radium-muted); font-family: Georgia, serif; font-size: 18px; }
.RadiumIntro__halfLife small { display: block; margin-top: 10px; color: var(--radium-muted); font-size: 11px; }
.RadiumIntro__body { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 44px; margin-top: 38px; }
.RadiumIntro__body .RadiumText { margin-bottom: 0; }
.RadiumFacts { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); margin: 44px 0 0; border-top: 1px solid var(--radium-line); border-bottom: 1px solid var(--radium-line); }
.RadiumFacts__item { display: block; padding: 22px 20px; }
.RadiumFacts__item + .RadiumFacts__item { border-left: 1px solid var(--radium-line); }
.RadiumFacts__item dt { margin-bottom: 8px; color: var(--radium-blue); font-size: 10px; font-weight: 600; }
.RadiumFacts__item dd { margin: 0; color: var(--radium-navy); font-family: Georgia, serif; font-size: 23px; }
.RadiumFacts__item p { margin: 5px 0 0; color: var(--radium-muted); font-size: 10px; line-height: 1.7; }

.RadiumScience__grid, .RadiumExperience__grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 46px; align-items: center; }
.RadiumHistory__grid { display: grid; grid-template-columns: 1fr; gap: 46px; align-items: start; }
.RadiumScience__visual, .RadiumHistory__visual, .RadiumExperience__visual { margin: 0; }
.RadiumScience__visual img, .RadiumHistory__visual img, .RadiumExperience__visual img { display: block; width: 100%; height: auto; }
.RadiumScience__visual { padding: 0; border: 1px solid var(--radium-line); background: #fbfcfd; }
.RadiumScience__grid { grid-template-columns: minmax(0,.86fr) minmax(0,1.14fr); }
.RadiumScience__visual img { width: 100%; }
.RadiumHistory__visual figcaption { margin-top: 12px; color: #7f8e96; font-size: 9px; line-height: 1.8; }

.RadiumTimeline { margin: 30px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--radium-line); }
.RadiumTimeline__item { position: relative; padding: 21px 0 21px 28px; border-bottom: 1px solid var(--radium-line); }
.RadiumTimeline__item::before { content: ""; position: absolute; top: 28px; left: 2px; width: 6px; height: 6px; border: 1px solid var(--radium-blue); border-radius: 50%; }
.RadiumTimeline__era { display: block; margin-bottom: 7px; color: var(--radium-blue); font-size: 8px; font-weight: 600; letter-spacing: .14em; }
.RadiumTimeline__item h3 { margin: 0 0 7px; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 15px; font-weight: 500; line-height: 1.7; }
.RadiumTimeline__item p { margin: 0; color: var(--radium-text); font-size: 11px; line-height: 1.9; }

.RadiumNote { margin-top: 28px; padding: 21px 23px; border: 1px solid var(--radium-line); background: #fbfcfd; }
.RadiumNote p { margin: 0; color: #667781; font-size: 11px; line-height: 1.9; }
.RadiumNote--wide { max-width: 820px; margin: 36px auto 0; }

.RadiumCompareTable { max-width: 900px; margin: 0 auto; border-top: 1px solid var(--radium-line); }
.RadiumCompareTable__row { display: grid; grid-template-columns: 170px repeat(2,minmax(0,1fr)); border-bottom: 1px solid var(--radium-line); }
.RadiumCompareTable__row > div { padding: 20px 20px; font-size: 13px; line-height: 1.8; }
.RadiumCompareTable__row > div + div { border-left: 1px solid var(--radium-line); }
.RadiumCompareTable__row > div:first-child { color: var(--radium-muted); font-size: 11px; }
.RadiumCompareTable__row--head > div { color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 16px; }
.RadiumCompareTable__row--head > div:first-child { color: transparent; }

.RadiumHistory__visual { width: min(720px, 100%); margin: 0 auto; }
.RadiumHistory__visual img { width: 100%; aspect-ratio: 8 / 5; object-fit: cover; }
.RadiumHistory__content { max-width: 820px; margin: 0 auto; width: 100%; }
.RadiumTimeline { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); border-left: 1px solid var(--radium-line); }
.RadiumTimeline__item { min-height: 190px; padding: 24px 24px 24px 48px; border-right: 1px solid var(--radium-line); }
.RadiumTimeline__item::before { left: 22px; top: 31px; }

.RadiumResearch { padding: 108px 0 114px; background: var(--radium-navy); }
.RadiumResearch .RadiumEyebrow, .RadiumSafety .RadiumEyebrow { color: #9bc1d4; }
.RadiumSafety__philosophy { margin: 0 0 18px; color: #b8d2df; font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 16px; line-height: 1.8; }
.RadiumResearch__head { max-width: 780px; margin: 0 auto 58px; text-align: center; }
.RadiumResearch__title { margin: 0; color: #fff; font-size: 34px; letter-spacing: .045em; line-height: 1.65; }
.RadiumResearch__lead { margin: 25px 0 0; color: #d8e4ea; font-size: 15px; line-height: 2; }
.RadiumResearch__grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 1px; padding: 1px; background: rgba(255,255,255,.14); }
.RadiumResearchCard { min-height: 280px; padding: 36px 32px; background: rgba(24,50,71,.97); }
.RadiumResearchCard__number { display: block; margin-bottom: 26px; color: #91b8cc; font-family: Georgia, serif; font-size: 28px; }
.RadiumResearchCard__label { margin: -6px 0 12px; color: #8fb4c8; font-size: 8px; font-weight: 600; letter-spacing: .14em; }
.RadiumResearchCard h3 { margin: 0 0 16px; color: #fff; font-size: 16px; font-weight: 500; line-height: 1.8; }
.RadiumResearchCard p { margin: 0; color: #cbd8df; font-size: 12px; line-height: 2; }
.RadiumDistinction { max-width: 800px; margin: 48px auto 0; padding: 34px 34px; border: 1px solid rgba(255,255,255,.2); text-align: center; }
.RadiumDistinction__label { display: block; margin-bottom: 15px; color: #9bc1d4; font-size: 9px; font-weight: 600; letter-spacing: .16em; }
.RadiumDistinction p { margin: 0; color: #f1f6f8; font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 17px; line-height: 2; }
.RadiumDistinction p strong { font-weight: 500; }
.RadiumDistinction small { display: block; margin-top: 17px; color: #bdced7; font-size: 10px; line-height: 1.9; }
.RadiumTransition { padding: 62px 0; background: #eef5f8; text-align: center; }
.RadiumTransition__text { margin: 0; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 19px; line-height: 2; }
.RadiumExperience__visual img { aspect-ratio: 4 / 3; object-fit: cover; }
.RadiumApproach__head { max-width: 700px; margin-bottom: 48px; }
.RadiumApproach__cards { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-top: 1px solid var(--radium-line); border-bottom: 1px solid var(--radium-line); }
.RadiumApproachCard { min-height: 230px; padding: 28px 24px 30px; }
.RadiumApproachCard + .RadiumApproachCard { border-left: 1px solid var(--radium-line); }
.RadiumApproachCard__number { display: block; margin-bottom: 20px; color: #b7cbd7; font-family: Georgia, serif; font-size: 25px; }
.RadiumApproachCard h3 { margin: 0 0 14px; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 16px; font-weight: 500; line-height: 1.7; }
.RadiumApproachCard p { margin: 0; color: var(--radium-text); font-size: 12px; line-height: 1.95; }
.RadiumApproach__statement { max-width: 820px; margin: 36px auto 0; color: var(--radium-muted); font-size: 11px; line-height: 1.95; text-align: center; }
.RadiumExperience__grid { grid-template-columns: minmax(0,.98fr) minmax(0,1.02fr); gap: 42px; }
.RadiumExperience__content .RadiumSectionTitle { font-size: 29px; line-height: 1.7; }

/* Hospitality / preparation */
.RadiumHospitality { padding: 92px 0 96px; background: #fff; border-top: 1px solid var(--radium-line); }
.RadiumHospitality__head { max-width: 700px; margin-bottom: 44px; }
.RadiumHospitality__grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); border-top: 1px solid var(--radium-line); border-left: 1px solid var(--radium-line); }
.RadiumHospitalityCard { min-height: 210px; padding: 28px 26px 30px; border-right: 1px solid var(--radium-line); border-bottom: 1px solid var(--radium-line); }
.RadiumHospitalityCard__label { display: block; margin-bottom: 17px; color: var(--radium-blue); font-size: 8px; font-weight: 600; letter-spacing: .15em; }
.RadiumHospitalityCard h3 { margin: 0 0 13px; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 16px; font-weight: 500; line-height: 1.7; }
.RadiumHospitalityCard p { margin: 0; color: var(--radium-text); font-size: 12px; line-height: 1.95; }
.RadiumPurityNote { display: grid; grid-template-columns: 150px 1fr; gap: 10px 26px; margin-top: 36px; padding: 26px 28px; border: 1px solid var(--radium-line); background: var(--radium-ivory); }
.RadiumPurityNote__label { grid-row: 1 / 3; color: var(--radium-blue); font-size: 8px; font-weight: 600; letter-spacing: .14em; line-height: 1.6; }
.RadiumPurityNote p { margin: 0; color: var(--radium-navy); font-size: 14px; line-height: 2; }
.RadiumPurityNote small { display: block; color: var(--radium-muted); font-size: 10px; line-height: 1.85; }


.RadiumFlowList { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--radium-line); border-left: 1px solid var(--radium-line); }
.RadiumFlowList__item { min-height: 240px; padding: 30px 28px; border-right: 1px solid var(--radium-line); border-bottom: 1px solid var(--radium-line); }
.RadiumFlowList__number { display: block; margin-bottom: 24px; color: #b7cbd7; font-family: Georgia, serif; font-size: 28px; }
.RadiumFlowList__item h3 { margin: 0 0 16px; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 18px; font-weight: 500; line-height: 1.7; }
.RadiumFlowList__item p { margin: 0; color: var(--radium-text); font-size: 12px; line-height: 2; }

.RadiumSafety { padding: 108px 0 114px; background: var(--radium-navy); }
.RadiumSafety__title { margin: 0; color: #fff; font-size: 35px; letter-spacing: .04em; line-height: 1.7; }
.RadiumSafety__grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 56px; margin-top: 44px; padding-top: 40px; border-top: 1px solid rgba(255,255,255,.16); }
.RadiumSafety__lead { margin: 0; color: #e8f0f4; font-size: 16px; line-height: 2; }
.RadiumSafety__text { margin: 0; color: #cbd8df; font-size: 13px; line-height: 2.1; }

.RadiumFaqList { border-top: 1px solid var(--radium-line); }
.RadiumFaqItem { border-bottom: 1px solid var(--radium-line); }
.RadiumFaqItem summary { position: relative; padding: 24px 52px 24px 0; color: var(--radium-navy); font-size: 14px; font-weight: 500; line-height: 1.8; cursor: pointer; list-style: none; }
.RadiumFaqItem summary::-webkit-details-marker { display: none; }
.RadiumFaqItem summary::before { content: "Q"; display: inline-block; margin-right: 14px; color: var(--radium-blue); font-family: Georgia, serif; font-size: 18px; }
.RadiumFaqItem summary::after { content: "+"; position: absolute; top: 50%; right: 3px; transform: translateY(-50%); color: var(--radium-blue); font-size: 22px; }
.RadiumFaqItem[open] summary::after { content: "−"; }
.RadiumFaqItem > div { padding: 0 48px 24px 33px; }
.RadiumFaqItem p { margin: 0; color: var(--radium-text); font-size: 13px; line-height: 2.05; }

.RadiumSources { padding: 72px 0; }
.RadiumSources__head { margin-bottom: 24px; }
.RadiumSources__title { font-size: 27px; }
.RadiumSources__text { max-width: 820px; margin: 0 0 22px; font-size: 12px; line-height: 2; }
.RadiumSources__list { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.RadiumSources__list li { color: #72848e; font-size: 10px; line-height: 1.8; }
.RadiumSources__list li::before { content: "—"; margin-right: 7px; color: var(--radium-blue); }

.RadiumCta { padding: 110px 0 118px; background: var(--radium-ivory); text-align: center; }
.RadiumCta__inner { max-width: 820px; }
.RadiumCta__title { margin: 0; font-size: 35px; letter-spacing: .045em; line-height: 1.7; }
.RadiumCta__text { max-width: 650px; margin: 26px auto 0; color: var(--radium-muted); font-size: 14px; line-height: 2.05; }
.RadiumCta__actions { display: flex; justify-content: center; gap: 12px; margin-top: 36px; }
.RadiumButton { display: inline-flex; min-width: 245px; min-height: 52px; align-items: center; justify-content: center; padding: 13px 24px; border: 1px solid var(--radium-navy); color: var(--radium-navy); font-size: 12px; letter-spacing: .04em; text-decoration: none; }
.RadiumCta .RadiumButton--primary,
.RadiumCta .RadiumButton--primary:link,
.RadiumCta .RadiumButton--primary:visited {
    background: var(--radium-navy);
    border-color: var(--radium-navy);
    color: #fff;
}

.RadiumCta .RadiumButton--ghost,
.RadiumCta .RadiumButton--ghost:link,
.RadiumCta .RadiumButton--ghost:visited {
    background: transparent;
    border-color: var(--radium-navy);
    color: var(--radium-navy);
}
.RadiumTextLink { display: inline-flex; align-items: center; gap: 10px; padding-bottom: 5px; border-bottom: 1px solid #9eb5c2; color: var(--radium-navy); font-size: 12px; text-decoration: none; }
.RadiumTextLink::after { content: "→"; color: var(--radium-blue); }
.RadiumCta__subLink { margin-top: 30px; }

@media (max-width: 900px) {
    .RadiumHero__inner, .RadiumInner, .RadiumCta__inner { width: calc(100% - 56px); }
    .RadiumSection { padding: 88px 0; }
    .RadiumHero__title {
    font-size: 40px; 
    font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
    font-weight: 500;
    letter-spacing: .04em;
    line-height: 1.5;
}
    .RadiumScience__grid, .RadiumExperience__grid { grid-template-columns: 1fr; gap: 38px; }
    .RadiumScience__content, .RadiumExperience__content { max-width: 680px; }
    .RadiumScience__visual { width: 100%; }
    .RadiumHistory__grid { gap: 38px; }
    .RadiumTimeline { grid-template-columns: 1fr; }
    .RadiumTimeline__item { min-height: 0; }
    .RadiumQuick__grid { gap: 32px; }
    .RadiumQuick__title { font-size: 25px; }
    .RadiumApproach__cards { grid-template-columns: 1fr; }
    .RadiumApproachCard { min-height: 0; padding: 26px 24px; }
    .RadiumApproachCard + .RadiumApproachCard { border-left: 0; border-top: 1px solid var(--radium-line); }
}