/* IASO Radium Thoron | Smartphone 767px- */

: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 { position: relative; margin-top: 0; background: var(--radium-white); color: var(--radium-text); overflow: hidden; 
    top: auto;
    margin-bottom: 0;
    padding-top: 0;}
.RadiumMain *, .RadiumMain *::before, .RadiumMain *::after { box-sizing: border-box; }

.RadiumHero{position:relative;width:100%;height:550px;min-height:550px;max-height:550px;display:flex;align-items:stretch;overflow:hidden;background:var(--radium-ivory);}
.RadiumHero__media, .RadiumHero__media picture, .RadiumHero__media img{position:absolute;inset:0;width:100%;height:100%;min-height:0;max-height:none;}
.RadiumHero__media img { object-fit: cover; object-position: 50% 46%; }
.RadiumHero__veil { position: absolute; inset: 0; z-index: 1; background: linear-gradient(180deg, rgba(248,247,243,.02) 0%, rgba(248,247,243,.03) 58%, rgba(248,247,243,.10) 76%, rgba(248,247,243,.34) 100%); }
.RadiumHero__inner, .RadiumInner, .RadiumCta__inner { position: relative; z-index: 2; width: calc(100% - 36px); margin: 0 auto; }
.RadiumHero__inner{position:relative;z-index:2;width:calc(100% - 36px);max-width:none;height:100%;min-height:0;max-height:none;margin:0 auto;padding:72px 0 0;display:flex;flex-direction:column;justify-content:flex-start;align-items:flex-start;}
.RadiumHero__inner > * {width:88%;max-width:340px;}


.RadiumEyebrow { margin: 0 0 15px; color: var(--radium-blue); font-size: 10px; font-weight: 600; letter-spacing: .18em; 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;color:var(--radium-navy);font-family:"Noto Serif JP","Yu Mincho","Hiragino Mincho ProN",serif;font-size:29px;font-weight:500;letter-spacing:.02em;line-height:1.52;}
.RadiumHero__subTitle { margin: 10px 0 0; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: 17px; font-weight: 500; letter-spacing: .04em; line-height: 1.75; }
.RadiumHero__lead { margin: 18px 0 0; color: var(--radium-navy); font-size: 16px; font-weight: 500; line-height: 1.85; }
.RadiumHero__text { margin: 15px 0 0; color: #4c606d; font-size: 11.5px; line-height: 1.85; }


/* Page guide */
.RadiumIndex{border-top:1px solid var(--radium-line);border-bottom:1px solid var(--radium-line);background:#fff}
.RadiumIndex .RadiumInner{width:100%;margin:0;padding:0}
.RadiumIndex__links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));counter-reset:radium-index}
.RadiumIndex__links a{position:relative;display:flex;min-height:68px;align-items:center;gap:9px;padding:15px 12px 15px 14px;border-right:1px solid var(--radium-line);border-bottom:1px solid var(--radium-line);color:var(--radium-navy);font-size:11px;font-weight:500;line-height:1.55;text-decoration:none;transition:background-color .28s ease,color .28s ease,box-shadow .28s ease}
.RadiumIndex__links a:nth-child(2n){border-right:0}
.RadiumIndex__links a:nth-last-child(-n+2){border-bottom:0}
.RadiumIndex__links a::before{counter-increment:radium-index;content:counter(radium-index,decimal-leading-zero);flex:0 0 auto;color:var(--radium-blue);font-family:Georgia,"Times New Roman",serif;font-size:10px;font-weight:400;line-height:1;transition:color .28s ease}
.RadiumIndex__links a:focus-visible{outline:1px solid rgba(110,157,184,.72);outline-offset:-4px;background-color:rgba(110,157,184,.055)}

.RadiumQuick { padding: 58px 0 64px; background: #fff; border-bottom: 1px solid var(--radium-line); }
.RadiumQuick__grid { display: flex; flex-direction: column; gap: 30px; }
.RadiumQuick__title { margin: 0 0 18px; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 25px; font-weight: 500; letter-spacing: .025em; line-height: 1.7; }
.RadiumQuick__visual { order: -1; margin: 0; overflow: hidden; }
.RadiumQuick__visual img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.RadiumQuick__points { display: flex; flex-direction: column; gap: 7px; margin-top: 22px; }
.RadiumQuick__points span { padding: 8px 10px; border: 1px solid var(--radium-line); color: #647781; font-size: 10px; line-height: 1.6; }

.RadiumSection { padding: 70px 0; }
.RadiumIntro, .RadiumHistory, .RadiumFlow { background: var(--radium-ivory); }
.RadiumExperience, .RadiumSources { background: #f5f9fb; }
.RadiumSectionHead { margin: 0 0 36px; }
.RadiumSectionHead--center { margin: 0 0 36px; text-align: left; }
.RadiumSectionTitle, .RadiumSources__title { margin: 0; font-size: 27px; letter-spacing: .03em; line-height: 1.65; }
.RadiumSectionLead { margin: 18px 0 0; color: var(--radium-muted); font-size: 13px; line-height: 2; }
.RadiumLead { margin: 30px 0; color: var(--radium-navy); font-size: 16px; line-height: 2; }

.RadiumText { 
    margin: 30px 0; 
    color: var(--radium-text); 
    font-size: 15px; line-height: 1.95; 
}

.RadiumText strong { color: var(--radium-navy); }

.RadiumIntro__head { margin-bottom: 32px; }
.RadiumIntro__signature { padding: 30px 0 32px; border-top: 1px solid var(--radium-line); border-bottom: 1px solid var(--radium-line); }
.RadiumIntro__kicker, .RadiumIntro__halfLifeLabel { display: block; margin: 0 0 11px; color: var(--radium-blue); font-size: 9px; font-weight: 600; letter-spacing: .14em; }
.RadiumIntro__nuclide { margin: 0; color: var(--radium-navy); font-family: Georgia, serif; font-size: 58px; line-height: 1; }
.RadiumIntro__definitionText { margin: 20px 0 0; color: var(--radium-navy); font-size: 15px; line-height: 1.95; }
.RadiumIntro__halfLife { margin-top: 30px; padding-top: 26px; border-top: 1px solid var(--radium-line); }
.RadiumIntro__halfLife strong { display: inline-block; color: var(--radium-navy); font-family: Georgia, serif; font-size: 58px; font-weight: 400; line-height: 1; }
.RadiumIntro__halfLifeUnit { margin-left: 5px; color: var(--radium-muted); font-family: Georgia, serif; font-size: 16px; }
.RadiumIntro__halfLife small { display: block; margin-top: 8px; color: var(--radium-muted); font-size: 10px; }
.RadiumIntro__body { margin-top: 30px; }
.RadiumIntro__body > div + div { margin-top: 18px; }
.RadiumIntro__body .RadiumText { margin-bottom: 0; }
.RadiumFacts { margin: 34px 0 0; border-top: 1px solid var(--radium-line); border-bottom: 1px solid var(--radium-line); }
.RadiumFacts__item { padding: 18px 0; }
.RadiumFacts__item + .RadiumFacts__item { border-top: 1px solid var(--radium-line); }
.RadiumFacts__item dt { margin-bottom: 7px; color: var(--radium-blue); font-size: 9px; 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, .RadiumHistory__grid, .RadiumExperience__grid { display: flex; flex-direction: column; gap: 34px; }
.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 { order: -1; padding: 0; border: 1px solid var(--radium-line); background: #fbfcfd; }
.RadiumHistory__visual figcaption { margin-top: 10px; color: #7f8e96; font-size: 9px; line-height: 1.75; }

.RadiumTimeline { margin: 26px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--radium-line); }
.RadiumTimeline__item { position: relative; padding: 20px 0 20px 26px; border-bottom: 1px solid var(--radium-line); }
.RadiumTimeline__item::before { content: ""; position: absolute; top: 27px; 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: .13em; }
.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: 12px; line-height: 1.9; }

.RadiumNote { margin-top: 24px; padding: 18px 17px; border: 1px solid var(--radium-line); background: #fbfcfd; }
.RadiumNote p { margin: 0; color: #667781; font-size: 10px; line-height: 1.9; }
.RadiumNote--wide { margin-top: 28px; }

.RadiumCompareTable { margin: 0; border-top: 1px solid var(--radium-line); }
.RadiumCompareTable__row { display: grid; grid-template-columns: 84px repeat(2,minmax(0,1fr)); border-bottom: 1px solid var(--radium-line); }
.RadiumCompareTable__row > div { padding: 15px 8px; font-size: 11px; line-height: 1.65; overflow-wrap: anywhere; }
.RadiumCompareTable__row > div + div { border-left: 1px solid var(--radium-line); }
.RadiumCompareTable__row > div:first-child { color: var(--radium-muted); font-size: 9px; }
.RadiumCompareTable__row--head > div { color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 12px; }
.RadiumCompareTable__row--head > div:first-child { color: transparent; }

.RadiumHistory__visual { order: 2; }

.RadiumResearch { padding: 82px 0 88px; background: var(--radium-navy); }
.RadiumResearch .RadiumEyebrow, .RadiumSafety .RadiumEyebrow { color: #9bc1d4; }
.RadiumSafety__philosophy { margin: 0 0 16px; color: #b8d2df; font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 14px; line-height: 1.8; }
.RadiumResearch__head { margin: 0 0 46px; text-align: left; }
.RadiumResearch__title { margin: 0; color: #fff; font-size: 30px; letter-spacing: .04em; line-height: 1.6; }
.RadiumResearch__lead { margin: 22px 0 0; color: #d8e4ea; font-size: 14px; line-height: 2; }
.RadiumResearch__grid { margin: 0; border-top: 1px solid rgba(255,255,255,.16); }
.RadiumResearchCard { padding: 30px 0 32px; border-bottom: 1px solid rgba(255,255,255,.16); }
.RadiumResearchCard__number { display: block; margin-bottom: 18px; color: #91b8cc; font-family: Georgia, serif; font-size: 25px; }
.RadiumResearchCard__label { margin: -4px 0 11px; color: #8fb4c8; font-size: 8px; font-weight: 600; letter-spacing: .13em; }
.RadiumResearchCard h3 { margin: 0 0 14px; color: #fff; font-size: 16px; font-weight: 500; line-height: 1.8; }
.RadiumResearchCard p { margin: 0; color: #cbd8df; font-size: 13px; line-height: 2; }
.RadiumDistinction { margin: 36px 0 0; padding: 26px 20px; border: 1px solid rgba(255,255,255,.2); text-align: left; }
.RadiumDistinction__label { display: block; margin-bottom: 13px; color: #9bc1d4; font-size: 8px; font-weight: 600; letter-spacing: .15em; }
.RadiumDistinction p { margin: 0; color: #f1f6f8; font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 15px; line-height: 1.95; }
.RadiumDistinction p strong { font-weight: 500; }
.RadiumDistinction small { display: block; margin-top: 15px; color: #bdced7; font-size: 10px; line-height: 1.9; }
.RadiumTransition { padding: 52px 0; background: #eef5f8; }
.RadiumTransition__text { margin: 0; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 16px; line-height: 2; }
.RadiumExperience__visual img { aspect-ratio: 4 / 3; object-fit: cover; }
.RadiumApproach__head { margin-bottom: 34px; }
.RadiumApproach__cards { border-top: 1px solid var(--radium-line); }
.RadiumApproachCard { padding: 24px 0 26px; border-bottom: 1px solid var(--radium-line); }
.RadiumApproachCard__number { display: block; margin-bottom: 15px; color: #b7cbd7; font-family: Georgia, serif; font-size: 24px; }
.RadiumApproachCard h3 { margin: 0 0 12px; 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: 13px; line-height: 1.95; }
.RadiumApproach__statement { margin: 28px 0 0; color: var(--radium-muted); font-size: 11px; line-height: 1.95; }
.RadiumExperience__visual { order: 2; }

/* Hospitality / preparation */
.RadiumHospitality { padding: 68px 0 72px; background: #fff; border-top: 1px solid var(--radium-line); }
.RadiumHospitality__head { margin-bottom: 32px; }
.RadiumHospitality__grid { border-top: 1px solid var(--radium-line); }
.RadiumHospitalityCard { padding: 22px 0 24px; border-bottom: 1px solid var(--radium-line); }
.RadiumHospitalityCard__label { display: block; margin-bottom: 12px; color: var(--radium-blue); font-size: 8px; font-weight: 600; letter-spacing: .14em; }
.RadiumHospitalityCard h3 { margin: 0 0 10px; 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: 13px; line-height: 1.95; }
.RadiumPurityNote { margin-top: 28px; padding: 20px 18px; border: 1px solid var(--radium-line); background: var(--radium-ivory); }
.RadiumPurityNote__label { display: block; margin-bottom: 12px; 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: 13px; line-height: 1.95; }
.RadiumPurityNote small { display: block; margin-top: 12px; color: var(--radium-muted); font-size: 9px; line-height: 1.85; }


.RadiumFlowList { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--radium-line); }
.RadiumFlowList__item { padding: 26px 0 28px; border-bottom: 1px solid var(--radium-line); }
.RadiumFlowList__number { display: block; margin-bottom: 16px; color: #b7cbd7; font-family: Georgia, serif; font-size: 25px; }
.RadiumFlowList__item h3 { margin: 0 0 13px; color: var(--radium-navy); font-family: "Noto Serif JP", "Yu Mincho", serif; font-size: 17px; font-weight: 500; line-height: 1.7; }
.RadiumFlowList__item p { margin: 0; color: var(--radium-text); font-size: 13px; line-height: 2; }

.RadiumSafety { padding: 82px 0 88px; background: var(--radium-navy); }
.RadiumSafety__title { margin: 0; color: #fff; font-size: 28px; letter-spacing: .03em; line-height: 1.7; }
.RadiumSafety__grid { display: block; margin-top: 34px; padding-top: 30px; border-top: 1px solid rgba(255,255,255,.16); }
.RadiumSafety__grid > div + div { margin-top: 24px; }
.RadiumSafety__lead { margin: 0; color: #e8f0f4; font-size: 15px; line-height: 2; }
.RadiumSafety__text { margin: 30px 0; color: #cbd8df; font-size: 13px; line-height: 2.05; }

.RadiumFaqList { border-top: 1px solid var(--radium-line); }
.RadiumFaqItem { border-bottom: 1px solid var(--radium-line); }
.RadiumFaqItem summary { position: relative; padding: 21px 36px 21px 0; color: var(--radium-navy); font-size: 14px; font-weight: 500; line-height: 1.75; cursor: pointer; list-style: none; }
.RadiumFaqItem summary::-webkit-details-marker { display: none; }
.RadiumFaqItem summary::before { content: "Q"; display: block; margin-bottom: 7px; color: var(--radium-blue); font-family: Georgia, serif; font-size: 17px; }
.RadiumFaqItem summary::after { content: "+"; position: absolute; top: 22px; right: 2px; color: var(--radium-blue); font-size: 21px; }
.RadiumFaqItem[open] summary::after { content: "−"; }
.RadiumFaqItem > div { padding: 0 30px 22px 0; }
.RadiumFaqItem p { margin: 0; color: var(--radium-text); font-size: 13px; line-height: 2; }

.RadiumSources { padding: 58px 0; }
.RadiumSources__head { margin-bottom: 20px; }
.RadiumSources__title { font-size: 24px; }
.RadiumSources__text { margin: 0 0 20px; color: var(--radium-text); font-size: 12px; line-height: 1.95; }
.RadiumSources__list { margin: 0; padding: 0; list-style: none; }
.RadiumSources__list li { padding: 6px 0; color: #72848e; font-size: 10px; line-height: 1.8; }
.RadiumSources__list li::before { content: "—"; margin-right: 7px; color: var(--radium-blue); }

.RadiumCta { padding: 82px 0 88px; background: var(--radium-ivory); text-align: left; }
.RadiumCta__title { margin: 0; font-size: 29px; letter-spacing: .03em; line-height: 1.7; }
.RadiumCta__text { margin: 23px 0 0; color: var(--radium-muted); font-size: 13px; line-height: 2; }
.RadiumCta__actions { display: flex; flex-direction: column; gap: 10px; margin-top: 32px; }
.RadiumButton { display: flex; width: 100%; min-height: 52px; align-items: center; justify-content: center; padding: 13px 18px; border: 1px solid var(--radium-navy); color: var(--radium-navy); font-size: 12px; letter-spacing: .035em; text-decoration: none; text-align: center; }
.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: 8px; padding-bottom: 4px; border-bottom: 1px solid #9eb5c2; color: var(--radium-navy); font-size: 11px; text-decoration: none; line-height: 1.8; }
.RadiumTextLink::after { content: "→"; color: var(--radium-blue); }
.RadiumCta__subLink { margin-top: 26px; }

@media (max-width: 390px) {
    .RadiumHero { height: 550px; min-height: 550px; 
    max-height: 550px;}
    .RadiumHero__inner, .RadiumInner, .RadiumCta__inner { width: calc(100% - 32px); }
    .RadiumHero__inner { width:calc(100% - 32px); padding:86px 0 0; }
.RadiumHero__inner > * {
    width: 80%;
    max-width: 315px;
}

    .RadiumHero__title { font-size: 26px; 
    font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
    font-weight: 500;
    letter-spacing: .02em;
    line-height: 1.55;
}
    .RadiumCompareTable__row { grid-template-columns: 74px repeat(2,minmax(0,1fr)); }
}

.RadiumHero .RadiumEyebrow{
    margin-bottom: 9px;
    color: var(--about-navy);
    text-shadow: 0 1px 8px rgba(10,24,36,.18);
}

/* 2026-08-09 SP HERO balanced final */
.RadiumHero{height:650px;min-height:650px;max-height:650px;}
.RadiumHero__media,.RadiumHero__media picture,.RadiumHero__media img{height:650px;min-height:650px;max-height:650px;}
.RadiumHero__media img{object-position:58% 45%;}
.RadiumHero__veil{
    background:linear-gradient(90deg,rgba(10,24,36,.10) 0%,rgba(10,24,36,.05) 42%,rgba(10,24,36,0) 74%),linear-gradient(180deg,rgba(10,24,36,0) 0%,rgba(10,24,36,0) 42%,rgba(10,24,36,.16) 58%,rgba(10,24,36,.42) 76%,rgba(10,24,36,.58) 100%);
}
.RadiumHero__inner{height:650px;min-height:650px;max-height:650px;padding:0 0 32px;justify-content:flex-end;border-left:0;}
.RadiumHero__inner > *{width:100%;max-width:none;}
.RadiumHero__title{max-width:350px;font-size:28px;line-height:1.5;}
.RadiumHero__subTitle{max-width:350px;margin-top:7px;font-size:14px;line-height:1.65;color:rgba(255,255,255,.94);text-shadow:0 1px 10px rgba(10,24,36,.16);}
.RadiumHero__lead{max-width:350px;margin-top:13px;font-size:13.5px;line-height:1.72;color:rgba(255,255,255,.94);text-shadow:0 1px 10px rgba(10,24,36,.16);}
.RadiumHero__text{max-width:350px;margin-top:11px;color:rgba(255,255,255,.84);font-size:11.5px;line-height:1.78;text-shadow:0 1px 8px rgba(10,24,36,.16);}
@media screen and (max-width:390px){
    .RadiumHero,.RadiumHero__media,.RadiumHero__media picture,.RadiumHero__media img,.RadiumHero__inner{height:650px;min-height:650px;max-height:650px;}
    .RadiumHero__inner{width:calc(100% - 32px);padding:0 0 28px;padding-bottom:82px;justify-content:flex-end;}
    .RadiumHero__inner > *{width:94%;max-width:350px;}
    .RadiumHero__title{
        font-size:35px;
        line-height: 1.28;
        letter-spacing: .02em;
        color:#eee;
        text-shadow: 0 1px 16px rgba(10,24,36,.16);
    }
}
@media screen and (max-width:390px){
  .RadiumHero__inner{
    padding-bottom:74px;
  }
}