:root{--navy:#1f2a44;--terra:#c4583a;--green:#1d6b50;--grey:#f3f4f6;--line:#e5e7eb;--muted:#5f6672;--gold:#a67c1a}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:"Noto Sans JP",sans-serif;color:var(--navy);background:#fff;line-height:1.8;font-size:16px;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
[id]{scroll-margin-top:72px}

/* header */
.site-header{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;height:56px;padding:0 16px;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}
.logo{font-weight:900;font-size:16px}
.menu-btn{border:0;background:none;width:44px;height:44px;display:flex;flex-direction:column;justify-content:center;gap:5px;align-items:center;cursor:pointer}
.menu-btn span{width:22px;height:2px;background:var(--navy);border-radius:2px}
.gnav{display:none}
.site-header.open .gnav{display:flex;flex-direction:column;position:absolute;top:56px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:4px 16px 12px;box-shadow:0 12px 24px rgba(0,0,0,.08)}
.site-header.open .gnav a{min-height:52px;display:flex;align-items:center;font-weight:700;border-top:1px solid var(--line)}
.site-header.open .gnav a:first-child{border-top:0}

/* hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#fff 0%,#eef0f3 100%);padding:28px 16px 40px;text-align:center}
.hero .blob{position:absolute;width:62vw;height:62vw;border-radius:50%;filter:blur(40px);opacity:.42;top:4%}
.hero .blob.t{background:#e07a5a;left:-8%} .hero .blob.g{background:#2a9a72;right:-8%}
.hero-books{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;max-width:440px;margin:0 auto}
.hero-books>div{display:flex;flex-direction:column;align-items:center}
.hero-books img{width:100%;border-radius:4px;box-shadow:0 14px 28px rgba(20,20,20,.3)}
.cause{margin-top:14px;font-weight:900;font-size:min(24px,6.4vw);line-height:1.3;white-space:nowrap}
.cause.t{color:var(--terra)} .cause.g{color:var(--green)}
.hero-copy{position:relative;margin-top:28px}
.hero-copy .pre{font-weight:700;color:var(--muted);font-size:20px}
.hero-copy h1{font-weight:900;font-size:min(30px,8.2vw);line-height:1.4;margin-top:4px}

/* sections */
.sec{padding:56px 16px}
.sec.grey{background:var(--grey)}
.ttl{font-size:26px;font-weight:900;text-align:center;line-height:1.45}
.sub{text-align:center;color:var(--muted);margin-top:8px}
.probs{display:grid;gap:16px;margin-top:28px}
.prob{background:#fff;border-radius:18px;padding:24px 20px}
.prob .k{font-size:22px;font-weight:900}
.prob.t .k{color:var(--terra)} .prob.g .k{color:var(--green)}
.prob p{margin-top:8px;color:#374151}
.prob .ex{margin-top:14px;background:var(--grey);border-radius:12px;padding:12px 14px}
.prob .ex b{font-family:Georgia,serif;font-size:18px}
.d{color:var(--gold);text-decoration:underline;text-decoration-thickness:2px}

/* series */
.series2{max-width:1100px;margin:0 auto}
.series2 .intro{display:grid;gap:24px}
.eyebrow{font-size:14px;font-weight:700;letter-spacing:.08em}
.series2.t .eyebrow,.series2.t h2{color:var(--terra)} .series2.g .eyebrow,.series2.g h2{color:var(--green)}
.series2 h2{font-size:34px;font-weight:900;line-height:1.3;margin-top:4px}
.series2 .lead{margin-top:10px;color:#374151}
.checks{list-style:none;display:flex;flex-wrap:wrap;gap:6px 18px;margin-top:14px;font-weight:700}
.checks li:before{content:"✓";margin-right:6px}
.series2.t .checks li:before{color:var(--terra)} .series2.g .checks li:before{color:var(--green)}

/* real book page */
.sample{margin-top:16px}
.sample button{display:block;width:100%;border:0;background:none;padding:0;cursor:zoom-in}
.sample img{width:100%;max-width:420px;margin:0 auto;border:1px solid var(--line);border-radius:6px;box-shadow:0 10px 24px rgba(0,0,0,.12)}
.sample figcaption{text-align:center;color:var(--muted);font-size:14px;margin-top:8px}
dialog.zoom{border:0;padding:0;background:transparent;max-width:100vw;max-height:100vh;margin:auto}
dialog.zoom::backdrop{background:rgba(10,12,20,.85)}
dialog.zoom img{max-height:92vh;width:auto;max-width:96vw}

/* volume cards */
.vols{display:grid;gap:16px;margin-top:32px}
.vol{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px 16px;display:grid;grid-template-columns:40% 1fr;gap:16px;align-items:start}
.sec.grey .vol{border-color:#fff}
.vol img{width:100%;border-radius:4px;box-shadow:0 10px 20px rgba(0,0,0,.2)}
.vol .no{font-size:14px;font-weight:900;letter-spacing:.06em}
.series2.t .vol .no{color:var(--terra)} .series2.g .vol .no{color:var(--green)}
.vol h3{font-size:17px;font-weight:900;line-height:1.45;margin-top:2px}
.vol h3 .nw{display:inline-block}
.vol .desc{font-size:16px;color:#374151;margin-top:6px;line-height:1.7}
.vol .vbtns{grid-column:1/-1;display:grid;gap:10px}
.vol .vbtns .btn{width:100%;padding:0 14px}
.vol .pr{grid-column:1/-1;margin-top:-4px}

.btns{display:grid;gap:10px;margin-top:20px}
.btn{display:flex;align-items:center;justify-content:center;min-height:52px;padding:0 22px;border-radius:999px;font-weight:700;font-size:16px;text-align:center;line-height:1.4}
.btn.p{background:var(--navy);color:#fff} .btn.o{border:1.5px solid var(--navy);background:#fff}
.pr{font-size:12px;color:var(--muted);margin-top:8px;text-align:center}

/* video */
.videos{display:grid;gap:20px;max-width:960px;margin:24px auto 0}
.vitem figcaption{margin-top:10px;font-size:15px;font-weight:700;text-align:center;line-height:1.5}
.yt{position:relative;aspect-ratio:16/9;border-radius:16px;overflow:hidden;background:#1f2a44}
.yt iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* faq */
.faq{max-width:900px;margin:24px auto 0}
.faq details{background:#fff;border-radius:14px;padding:16px 18px;margin-bottom:10px}
.faq summary{font-weight:900;list-style:none;display:flex;justify-content:space-between;gap:12px;min-height:28px;cursor:pointer}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"＋";color:var(--muted)}
.faq details[open] summary:after{content:"－"}
.faq p{margin-top:8px;color:#374151}

/* sns */
.sns{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:24px auto 0;max-width:640px}
.sns a{display:flex;align-items:center;justify-content:center;min-height:52px;border-radius:999px;background:var(--grey);font-weight:700}

/* footer */
.site-footer{background:var(--navy);color:#cfd3dc;padding:36px 16px;font-size:14px;line-height:2}
.site-footer nav{display:grid;grid-template-columns:1fr 1fr;gap:4px 12px;margin-bottom:16px}
.site-footer nav a{color:#fff;font-weight:700;min-height:44px;display:flex;align-items:center}
.site-footer .op{color:#fff;font-weight:700;margin-top:8px}

/* sub pages (word / about / privacy) */
.crumb{padding:12px 16px 0;font-size:14px;color:var(--muted);max-width:960px;margin:0 auto}
.crumb a{text-decoration:underline}
.page{max-width:960px;margin:0 auto;padding:16px 16px 64px}
.page h1{font-size:26px;font-weight:900;line-height:1.45;margin-top:4px}
.page h1 small{display:block;font-size:18px;font-weight:700;margin-top:4px;font-family:Georgia,serif}
.page .lead{margin-top:12px;color:#374151}
.page h2{font-size:22px;font-weight:900;line-height:1.45;margin:44px 0 14px}
.page p+p{margin-top:12px}
.page.t .eyebrow{color:var(--terra)} .page.g .eyebrow{color:var(--green)}
.w{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px 16px;margin-bottom:12px}
.wt{display:flex;align-items:baseline;gap:4px 12px;flex-wrap:wrap}
.wt .no{font-size:14px;color:var(--muted);font-weight:700}
.wt b{font-family:Georgia,serif;font-size:26px;line-height:1.3}
.ipa{color:var(--muted);font-size:16px}
.lv{font-size:14px;font-weight:700;color:var(--muted);background:var(--grey);border-radius:999px;padding:0 12px}
.m{margin-top:6px}
.pos{display:inline-block;font-size:13px;border:1px solid var(--muted);color:var(--muted);border-radius:4px;padding:0 5px;margin-right:6px;line-height:1.5;vertical-align:1px}
.w .ex{margin-top:10px;background:var(--grey);border-radius:12px;padding:12px 14px;line-height:1.7}
.w .ex .ja{color:var(--muted);margin-top:2px}
.rel{margin-top:10px;color:#374151}
.rel span{display:inline-block;margin-right:14px}
.rel i{font-style:normal;font-weight:700;font-size:13px;border:1px solid var(--muted);color:var(--muted);border-radius:4px;padding:0 5px;margin-right:6px;line-height:1.5}
.tips{background:var(--grey);border-radius:16px;padding:18px 16px}
.tips li{margin:6px 0 6px 20px}
.tips b{font-family:Georgia,serif}
.page .d{text-decoration-thickness:3px;text-decoration-color:#c59b1a}
.book{display:grid;grid-template-columns:34% 1fr;gap:16px;align-items:start;background:var(--grey);border-radius:18px;padding:18px 16px}
.book img{width:100%;border-radius:4px;box-shadow:0 10px 20px rgba(0,0,0,.2)}
.book .bt{font-weight:900;font-size:17px;line-height:1.45}
.book .bs{color:var(--muted);font-size:14px;margin-top:2px}
.book .bn{margin-top:6px}
.book .btns,.book .pr{grid-column:1/-1}
.book .btns{margin-top:0}
.links{display:grid;gap:10px}
.links a{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px;font-weight:700;min-height:52px}
.links a small{display:block;font-weight:400;color:var(--muted);font-size:14px}
.info{border-top:1px solid var(--line)}
.info div{display:grid;gap:2px;padding:14px 0;border-bottom:1px solid var(--line)}
.info dt{font-weight:700;color:var(--muted);font-size:14px}
.page ul.list{margin:8px 0 0 20px}
.page ul.list li{margin:4px 0}
.page .ext{text-decoration:underline;word-break:break-all}
.page .date{margin-top:40px;color:var(--muted)}

/* tablet & desktop */
@media (min-width:768px){
  .site-header{height:64px;padding:0 40px}
  .menu-btn{display:none}
  .gnav,.site-header.open .gnav{display:flex;flex-direction:row;position:static;gap:28px;font-size:14px;font-weight:500;padding:0;border:0;box-shadow:none;background:none}
  .site-header.open .gnav a{min-height:0;border:0;font-weight:500}
  [id]{scroll-margin-top:80px}
  .sec{padding:88px 40px}
  .ttl{font-size:36px}
  .probs{grid-template-columns:1fr 1fr;max-width:1100px;margin:36px auto 0}
  .series2 .intro{grid-template-columns:1fr 1fr;gap:56px;align-items:center}
  .series2 h2{font-size:44px}
  .vols{grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px}
  .vols.two{grid-template-columns:repeat(2,minmax(0,340px));justify-content:center}
  .vol{grid-template-columns:1fr;grid-template-rows:auto 1fr auto auto;padding:22px 20px}
  .vol img{width:62%;margin:0 auto}
  .videos{grid-auto-flow:column;grid-auto-columns:minmax(0,1fr)}
  .videos:has(.vitem:nth-child(2)){max-width:1100px}
  .sns{grid-template-columns:repeat(5,auto);justify-content:center}
  .sns a{padding:0 28px}
  .site-footer{padding:48px 40px}
  .site-footer nav{display:flex;flex-wrap:wrap;gap:0 28px}
  .crumb{padding:20px 40px 0}
  .page{padding:20px 40px 88px}
  .page h1{font-size:38px}
  .page h1 small{font-size:22px}
  .page h2{font-size:26px;margin-top:56px}
  .w{padding:22px 26px}
  .book{grid-template-columns:150px 1fr;gap:28px;padding:28px 32px;align-items:center}
  .book .btns,.book .pr{grid-column:2}
  .book .btns{grid-template-columns:auto auto;justify-content:start}
  .links{grid-template-columns:1fr 1fr}
  .info div{grid-template-columns:200px 1fr;gap:16px}
}
@media (min-width:1024px){
  .hero{padding:72px 40px 72px;min-height:640px}
  .hero .blob{width:520px;height:520px;filter:blur(70px);top:40px}
  .hero .blob.t{left:calc(50% - 535px)} .hero .blob.g{right:calc(50% - 535px)}
  .hero-books{grid-template-columns:230px 230px;gap:300px;max-width:none;justify-content:center}
  .cause{font-size:60px;white-space:nowrap}
  .hero-copy{margin-top:40px}
  .hero-copy .pre{font-size:40px}
  .hero-copy h1{font-size:74px}
  .series2 .sample img{max-width:460px}
}
.nw{display:inline-block}
.more{max-width:420px;margin:28px auto 0}
.gh{font-family:Georgia,serif}
.tips .pos{margin-left:2px}