:root{
    --paper:#FBFAF6;
    --white:#FFFFFF;
    --sumi:#1F1F1F;
    --usuzumi:#6E6B66;
    --mizu:#A5D8E4;
    --mizu-soft:#EAF6F8;
    --ao:#3E7FA8;
    --ao-deep:#255F83;
    --obi:#EDE3CB;
    --obi-soft:#F5EFE1;
    --line:#D9D4C9;
    --danger:#8C4C45;
    --maxw:680px;
    --wide:1080px;
    --header-h:100px;
    --header-bg:rgba(251,250,246,.95);
    --card-bg:rgba(255,255,255,.58);
    --focus:#3E7FA8;
    color-scheme:light;
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}
  body{
    background:var(--paper);color:var(--sumi);overflow-x:hidden;
    font-family:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
    font-weight:500;line-height:2;font-size:16px;
    -webkit-font-smoothing:antialiased;
  }
  button,input,select,textarea{font:inherit;color:inherit}
  button{cursor:pointer}
  a{color:inherit}
  a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
  [hidden]{display:none!important}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
  .wide{max-width:var(--wide);margin:0 auto;padding:0 24px}
  .page-section{padding:104px 0}
  .rule-top{border-top:1px solid var(--line)}
  .eyebrow{font-size:12px;letter-spacing:.32em;color:var(--usuzumi);margin-bottom:32px;text-transform:none}
  .page-title{font-size:clamp(30px,7vw,48px);line-height:1.45;letter-spacing:.06em;font-weight:900;margin-bottom:34px}
  .lead{font-size:clamp(17px,3vw,20px);line-height:2.05;letter-spacing:.03em}
  .note{font-size:13px;color:var(--usuzumi);line-height:1.9}
  .accent{color:var(--ao-deep)}
  .mincho{font-family:"Shippori Mincho B1",serif}

  /* header */
  .site-header{position:sticky;top:0;z-index:40;background:var(--header-bg);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
  .header-main{height:54px;display:flex;align-items:center;justify-content:space-between;gap:18px}
  .brand{font-weight:700;font-size:14px;letter-spacing:.18em;text-decoration:none;white-space:nowrap}
  .quick-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;font-size:12px;letter-spacing:.1em;text-decoration:none;border:1px solid var(--sumi);padding:0 12px;border-radius:2px;white-space:nowrap}
  .quick-link:hover{background:var(--sumi);color:var(--paper)}
  .nav-shell{border-top:1px solid var(--line);overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;overscroll-behavior-inline:contain}
  .nav-shell::-webkit-scrollbar{display:none}
  .site-nav{display:flex;align-items:center;min-width:max-content;height:46px}
  .nav-link{position:relative;display:flex;align-items:center;justify-content:center;min-height:44px;height:46px;padding:0 17px;text-decoration:none;font-size:12px;letter-spacing:.1em;color:var(--usuzumi);white-space:nowrap}
  .nav-link:first-child{padding-left:0;margin-left:0}
  .nav-link::after{content:"";position:absolute;left:17px;right:17px;bottom:0;height:2px;background:transparent}
  .nav-link:first-child::after{left:0}
  .nav-link:hover,.nav-link[aria-current="page"]{color:var(--sumi)}
  .nav-link[aria-current="page"]::after{background:var(--ao)}

  /* page switching */
  .page{animation:pagein .45s ease both}
  @keyframes pagein{from{opacity:.2;transform:translateY(5px)}to{opacity:1;transform:none}}

  /* book top */
  .fv{min-height:calc(100vh - var(--header-h));min-height:calc(100svh - var(--header-h));display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:62px 24px 48px;animation:fadein 1.05s ease both}
  @keyframes fadein{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
  .fv-cat{width:142px;height:auto;margin-bottom:8px}
  .fv-titleblock{display:flex;align-items:center;gap:20px}
  .fv-sub{font-family:"Zen Kaku Gothic Antique",sans-serif;writing-mode:vertical-rl;font-size:14px;letter-spacing:.5em;font-weight:500}
  .fv-kaku{font-family:"Shippori Mincho B1",serif;font-size:clamp(92px,24vw,164px);font-weight:800;line-height:1;letter-spacing:.04em;background:linear-gradient(160deg,var(--mizu) 5%,var(--ao) 95%);-webkit-background-clip:text;background-clip:text;color:transparent}
  .fv-counseling{font-family:"Zen Kaku Gothic Antique",sans-serif;margin-top:16px;border:4px double var(--ao);padding:10px 24px;font-size:clamp(20px,5vw,30px);font-weight:700;letter-spacing:.28em;text-indent:.28em}
  .fv-copy{margin-top:54px}
  .fv-copy-main{font-size:clamp(22px,5.2vw,32px);font-weight:900;letter-spacing:.06em}
  .fv-copy-main .kiku{font-family:"Shippori Mincho B1",serif;font-weight:800;font-size:1.35em;background:linear-gradient(135deg,var(--mizu),var(--ao));-webkit-background-clip:text;background-clip:text;color:transparent}
  .fv-copy-sub{margin-top:14px;font-size:14px;letter-spacing:.14em}
  .fv-copy-tag{display:inline-block;margin-top:14px;border:1px solid var(--sumi);padding:4px 14px;font-size:12px;letter-spacing:.11em;line-height:1.7}
  .fv-authors{margin-top:36px;font-size:13px;letter-spacing:.16em;color:var(--usuzumi)}
  .fv-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:30px}
  .fv-scroll{margin-top:34px;font-size:11px;letter-spacing:.3em;color:var(--usuzumi)}

  /* components */
  .button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;text-decoration:none;border:1px solid var(--sumi);padding:10px 22px;font-size:13px;letter-spacing:.12em;background:transparent;border-radius:2px}
  .button:hover{background:var(--sumi);color:var(--paper)}
  .button.primary{background:var(--sumi);color:var(--paper)}
  .button.primary:hover{background:var(--ao-deep);border-color:var(--ao-deep)}
  .button.soft{border-color:var(--ao);color:var(--ao-deep);background:var(--mizu-soft)}
  .button.soft:hover{background:var(--ao);color:white}
  .button.disabled{opacity:.48;pointer-events:none}
  .section-heading{font-size:clamp(23px,5vw,31px);font-weight:900;letter-spacing:.08em;line-height:1.7;margin-bottom:32px}
  .body-copy p{margin-bottom:1.55em}
  .body-copy p:last-child{margin-bottom:0}
  .plain-link{text-underline-offset:5px;text-decoration-thickness:1px}
  .status{display:inline-block;border:1px solid var(--ao);color:var(--ao-deep);padding:2px 10px;font-size:11px;letter-spacing:.16em;margin-bottom:20px}

  /* news band / news */
  .news-band{background:var(--obi);border-top:1px solid rgba(31,31,31,.05);border-bottom:1px solid rgba(31,31,31,.06)}
  .news-band-inner{padding:18px 24px;display:flex;flex-direction:column;gap:9px}
  .news-band-item{display:grid;grid-template-columns:88px 82px 1fr;gap:12px;align-items:baseline;font-size:13px;letter-spacing:.04em}
  .news-kind{font-size:10px;letter-spacing:.14em;border:1px solid var(--sumi);padding:1px 7px;text-align:center}
  .news-date{font-size:11px;color:var(--usuzumi);letter-spacing:.08em}
  .news-band-item a{text-underline-offset:4px}
  .news-list{list-style:none;border-top:1px solid var(--line)}
  .news-row{display:grid;grid-template-columns:106px 88px 1fr;gap:16px;padding:21px 2px;border-bottom:1px solid var(--line);align-items:start}
  .news-row time{font-size:12px;color:var(--usuzumi);letter-spacing:.08em;padding-top:3px}
  .news-row .news-kind{margin-top:1px}
  .news-label{line-height:1.8}
  .news-detail{font-size:13px;color:var(--usuzumi);margin-top:6px;line-height:1.8}

  /* checklist */
  .checks{display:flex;flex-direction:column;gap:14px;margin-bottom:54px}
  .check{display:flex;gap:14px;align-items:flex-start;text-align:left;background:none;border:none;font:inherit;color:inherit;cursor:pointer;line-height:1.9;width:100%}
  .check .box{flex:none;width:20px;height:20px;margin-top:6px;border:2px solid var(--sumi);border-radius:3px;position:relative}
  .check[aria-pressed="true"] .box::after{content:"";position:absolute;left:4px;top:-3px;width:8px;height:15px;border-right:3px solid var(--ao);border-bottom:3px solid var(--ao);transform:rotate(40deg)}
  .checks-msg{font-size:clamp(19px,4.5vw,24px);font-weight:700;letter-spacing:.06em;line-height:2.05}
  .checks-msg em{font-style:normal;border-bottom:3px solid var(--mizu)}

  /* steps */
  .steps{margin:50px 0 34px;border-top:1px solid var(--line)}
  .step{display:flex;gap:20px;padding:25px 4px;border-bottom:1px solid var(--line);align-items:baseline}
  .step-no{flex:none;font-weight:900;font-size:22px;color:var(--ao)}
  .step-name{font-weight:700;letter-spacing:.05em}
  .step-desc{font-size:14px;color:var(--usuzumi);letter-spacing:.02em}

  /* voices / cards */
  .voices{display:flex;flex-direction:column;gap:24px}
  .voice{border:1px solid var(--sumi);padding:23px 25px;background:var(--white)}
  .voice p{line-height:2}
  .voice cite{display:block;margin-top:10px;font-style:normal;font-size:12px;letter-spacing:.16em;color:var(--ao);font-weight:700}
  .card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:44px}
  .card{border:1px solid var(--line);background:var(--card-bg);padding:25px}
  .card h3{font-size:17px;letter-spacing:.05em;margin-bottom:12px}
  .card p{font-size:14px;color:var(--usuzumi);line-height:1.9}
  .card .button{margin-top:22px}

  /* authors / book */
  .author{margin-bottom:50px}
  .author:last-child{margin-bottom:0}
  .author h3{font-size:18px;letter-spacing:.12em;margin-bottom:5px}
  .author .role{font-size:12px;letter-spacing:.15em;color:var(--ao);font-weight:700;margin-bottom:14px}
  .author p{font-size:14px;line-height:2.05}
  .book-block{background:var(--obi)}
  .book-title{font-size:clamp(21px,4.8vw,28px);font-weight:900;letter-spacing:.09em;margin-bottom:3px}
  .book-sub{font-size:13px;letter-spacing:.17em;margin-bottom:26px}
  .book-data{font-size:14px;line-height:2.15;margin-bottom:32px}
  .buy{display:flex;flex-wrap:wrap;gap:12px}

  /* inside page hero */
  .inside-hero{padding:118px 0 92px;text-align:left}
  .inside-hero .eyebrow{margin-bottom:24px}
  .inside-hero .lead{max-width:620px}
  .big-quote{font-family:"Shippori Mincho B1",serif;font-size:clamp(26px,6vw,40px);font-weight:800;line-height:1.75;letter-spacing:.05em;margin:44px 0}
  .backstage-word{font-family:"Shippori Mincho B1",serif;font-size:clamp(48px,13vw,92px);font-weight:800;line-height:1.1;background:linear-gradient(150deg,var(--mizu),var(--ao));-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:34px}
  /* philosophy / backstage */
  .backstage-hero{padding:104px 0 78px}
  .backstage-hero .wrap{max-width:720px}
  .backstage-title{font-family:"Shippori Mincho B1",serif;font-size:clamp(38px,5.2vw,54px);font-weight:800;line-height:1.55;letter-spacing:.02em;margin:0}
  .backstage-title-line{display:block;white-space:nowrap}
  .backstage-title-accent{color:var(--ao-deep)}
  .founder-message{padding:70px 0 124px}
  .founder-message-body{max-width:680px;font-size:16px;line-height:2.2;letter-spacing:.02em}
  .founder-message-body p{margin:0 0 1.85em}
  .founder-message-body p:last-child{margin-bottom:0}
  .founder-message-body .founder-message-emphasis{color:var(--ao-deep);font-weight:700}
  .three-moves{border-top:1px solid var(--line);margin-top:44px}
  .move{display:grid;grid-template-columns:68px 1fr;gap:18px;padding:26px 4px;border-bottom:1px solid var(--line)}
  .move-no{font-family:"Shippori Mincho B1",serif;color:var(--ao);font-size:25px;font-weight:800}
  .move h3{font-size:18px;letter-spacing:.05em;margin-bottom:8px}
  .move p{font-size:14px;color:var(--usuzumi)}
  .science-note{margin-top:42px;background:var(--mizu-soft);padding:25px;border-left:3px solid var(--ao);font-size:14px;line-height:2}
  .myths{list-style:none;margin-top:30px;border-top:1px solid var(--line)}
  .myths li{padding:18px 3px;border-bottom:1px solid var(--line);font-size:14px}
  .myths li::before{content:"×";display:inline-block;color:var(--ao-deep);font-weight:900;margin-right:12px}

  /* evidence */
  .evidence-summary{margin-top:42px;border-top:1px solid var(--line)}
  .evidence-row{display:grid;grid-template-columns:120px 1fr;gap:24px;padding:27px 3px;border-bottom:1px solid var(--line)}
  .evidence-row .label{font-size:12px;letter-spacing:.14em;color:var(--ao-deep);font-weight:700}
  .evidence-row h3{font-size:17px;letter-spacing:.04em;margin-bottom:9px}
  .evidence-row p{font-size:14px;color:var(--usuzumi);line-height:1.95}
  .evidence-caution{margin-top:36px;border:1px solid var(--sumi);background:var(--white);padding:27px}
  .evidence-caution h3{font-size:17px;letter-spacing:.05em;margin-bottom:12px}
  .evidence-caution p{font-size:14px;line-height:1.95;color:var(--usuzumi)}
  .reference-list{list-style:none;border-top:1px solid var(--line);margin-top:34px}
  .reference-list li{padding:19px 2px;border-bottom:1px solid var(--line);font-size:13px;line-height:1.85;color:var(--usuzumi)}
  .reference-list a{text-underline-offset:4px}
  .reference-no{display:inline-block;min-width:30px;color:var(--ao-deep);font-weight:700}

  /* downloads */
  .download-item{display:grid;grid-template-columns:86px 1fr auto;gap:18px;align-items:center;padding:26px 3px;border-bottom:1px solid var(--line)}
  .download-item:first-child{border-top:1px solid var(--line)}
  .file-tag{display:flex;align-items:center;justify-content:center;width:64px;height:64px;border:1px solid var(--ao);color:var(--ao-deep);font-size:11px;letter-spacing:.12em;background:var(--mizu-soft)}
  .download-item h3{font-size:16px;letter-spacing:.05em;margin-bottom:3px}
  .download-item p{font-size:13px;color:var(--usuzumi);line-height:1.75}
  details{border-bottom:1px solid var(--line)}
  details:first-child{border-top:1px solid var(--line)}
  summary{cursor:pointer;padding:20px 2px;font-weight:700;letter-spacing:.04em}
  details p{padding:0 2px 22px;font-size:14px;color:var(--usuzumi)}

  /* kit */
  .kit-box{margin-top:44px;border:1px solid var(--sumi);background:var(--white);padding:32px}
  .kit-list{list-style:none;border-top:1px solid var(--line);margin:28px 0}
  .kit-list li{display:grid;grid-template-columns:32px 1fr;gap:10px;padding:17px 0;border-bottom:1px solid var(--line);font-size:14px}
  .kit-list li::before{content:"○";color:var(--ao);font-weight:900}
  .use-scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:36px 0}
  .use-scene{border:1px solid var(--line);padding:17px 12px;text-align:center;font-size:13px;letter-spacing:.05em;background:var(--obi-soft)}

  /* forms */
  .form{margin-top:42px}
  .field{margin-bottom:28px}
  .field label,.field legend{display:block;font-weight:700;font-size:14px;letter-spacing:.04em;margin-bottom:9px}
  .required{color:var(--danger);font-size:11px;margin-left:8px}
  .input,.select,.textarea{width:100%;border:1px solid var(--line);background:var(--white);padding:13px 14px;border-radius:2px;line-height:1.7;font-size:16px;color-scheme:light}
  .textarea{min-height:190px;resize:vertical}
  .choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
  .choice{display:flex;align-items:flex-start;gap:8px;border:1px solid var(--line);background:var(--white);padding:11px 12px;font-size:13px;line-height:1.55}
  .field label.choice{display:flex;margin-bottom:0;font-weight:500}
  .choice input{margin-top:4px}
  .form-actions{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin-top:34px}
  .form-status{font-size:13px;color:var(--usuzumi);margin-top:18px;min-height:1.8em}
  .form-status.is-success{color:var(--ao-deep)}
  .form-status.is-error{color:var(--danger)}
  .form[aria-busy="true"] button[type="submit"]{opacity:.55;pointer-events:none}
  .honeypot{position:absolute;left:-9999px;top:-9999px;height:0;width:0;overflow:hidden}
  .status-msg{padding:16px 20px;margin:0 0 28px;border-left:4px solid var(--ao);background:var(--mizu-soft);font-size:14px;line-height:1.9}
  .status-msg.err{border-left-color:var(--danger);background:#F7EBEB}
  .consent{display:flex;align-items:flex-start;gap:10px;font-size:13px;line-height:1.8}
  .consent input{flex:none;margin-top:6px}
  .consent a{text-underline-offset:4px}
  .author-contact{padding:28px 0 76px}
  .author-contact + .author-contact{padding-top:76px}
  .author-contact .section-heading{font-size:clamp(21px,4.6vw,29px)}
  .author-request{border:0}
  .reader-bonus{margin-top:72px;padding:40px 32px;border:1px solid var(--sumi);background:var(--white)}
  .reader-bonus .form{margin-top:30px}
  .textarea.compact{min-height:130px}
  .privacy-box{margin-top:34px;padding:22px;background:var(--obi-soft);font-size:13px;color:var(--usuzumi);line-height:1.9}
  .contact-types{border-top:1px solid var(--line);margin-top:38px}
  .contact-type{display:grid;grid-template-columns:170px 1fr;gap:24px;padding:24px 2px;border-bottom:1px solid var(--line)}
  .contact-type h3{font-size:15px;letter-spacing:.05em}
  .contact-type p{font-size:14px;color:var(--usuzumi)}

  /* footer */
  .site-footer{border-top:1px solid var(--line);padding:42px 24px 50px;text-align:center;font-size:12px;letter-spacing:.1em;color:var(--usuzumi)}
  .footer-nav{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-bottom:20px}
  .footer-nav a{text-underline-offset:4px}
  .footer-note{margin-top:12px;font-size:11px;letter-spacing:.04em}

  @media(max-width:760px){
    :root{--header-h:100px}
    .header-main{height:54px}
    .quick-link{font-size:11px;padding:0 10px}
    .nav-link{padding:0 13px}
    .nav-link::after{left:13px;right:13px}
    .nav-link:first-child{padding-left:0}
    .card-grid{grid-template-columns:1fr}
    .download-item{grid-template-columns:70px 1fr;align-items:start}
    .download-item .button{grid-column:2;margin-top:7px;justify-self:start}
    .use-scenes{grid-template-columns:1fr}
    .choice-grid{grid-template-columns:1fr}
    .reader-bonus{padding:30px 22px}
    .contact-type{grid-template-columns:1fr;gap:8px}
  }
  @media(max-width:520px){
    .page-section{padding:82px 0}
    .inside-hero{padding:88px 0 70px}
    .backstage-hero{padding:72px 0 54px}
    .backstage-title{font-size:clamp(22px,7vw,34px);line-height:1.65;letter-spacing:.01em}
    .founder-message{padding:54px 0 92px}
    .founder-message-body{font-size:16px;line-height:2.1;letter-spacing:.015em}
    .founder-message-body p{margin-bottom:1.75em}
    .fv{padding-top:48px}
    .fv-titleblock{gap:11px}
    .fv-sub{font-size:12px}
    .fv-copy{margin-top:46px}
    .news-band-item{grid-template-columns:72px 1fr;gap:8px 10px}
    .news-band-item .news-kind{grid-column:1}
    .news-band-item .news-date{grid-column:2;grid-row:1}
    .news-band-item .news-band-label{grid-column:1 / -1}
    .news-row{grid-template-columns:88px 1fr;gap:10px 12px}
    .news-row .news-kind{grid-column:2;grid-row:1;justify-self:start}
    .news-row .news-text{grid-column:1 / -1}
    .move{grid-template-columns:47px 1fr}
    .evidence-row{grid-template-columns:1fr;gap:7px}
    .download-item{grid-template-columns:56px 1fr;gap:12px}
    .file-tag{width:50px;height:50px}
    .kit-box{padding:24px 20px}
  }

  @media(max-width:340px){
    .wide,.wrap{padding-left:18px;padding-right:18px}
    .brand{font-size:13px;letter-spacing:.12em}
    .quick-link{font-size:10px;letter-spacing:.06em;padding:0 8px}
    .fv{padding-left:16px;padding-right:16px}
    .fv-titleblock{gap:8px}
    .fv-kaku{font-size:82px}
    .fv-sub{font-size:11px;letter-spacing:.32em}
    .fv-counseling{font-size:18px;letter-spacing:.20em;text-indent:.20em;padding:8px 14px;border-width:3px}
    .fv-copy-main{font-size:18px;letter-spacing:.02em;white-space:nowrap}
    .fv-copy-sub{font-size:12px;letter-spacing:.08em}
    .fv-copy-tag{font-size:10px;letter-spacing:.05em;padding:4px 8px}
    .fv-authors{font-size:11px;letter-spacing:.08em}
  }

  @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.page,.fv{animation:none!important}}


.skip-link{
  position:fixed;left:14px;top:10px;z-index:1000;
  transform:translateY(-160%);background:var(--sumi);color:var(--paper);
  padding:8px 13px;text-decoration:none;border-radius:2px;font-size:13px;
}
.skip-link:focus{transform:translateY(0)}