/* ============================================================
   合同会社エイト
   軸: 定款3 ウェブサイトの企画・制作・運営及び管理
   構成: hero=横帯が上下に開く / 図版なし / 事業=同じ幅の3枚 /
        進め方=横に流れる（下層） / 対応範囲なし
   動き: 登場=帯が開く・文字がぼけから焦点へ ・ スクロール=見出しが貼りつく
        ・ ホバー=下線が左から伸びる
   文章: 社名の比喩に寄せない。体言止めを使わない。（design-brief.md）
   ============================================================ */
:root{
  --bg:#ffffff;
  --bg-2:#f2f2f0;
  --ink:#101014;
  --ink-2:#4a4a52;
  --ink-3:#8b8b93;
  --line:#101014;
  --hair:rgba(16,16,20,.14);
  --key:#1f3cff;
  --wrap:1180px;
  --pad:clamp(1.3rem,4.5vw,4.5rem);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:"Noto Sans JP",system-ui,-apple-system,Meiryo,sans-serif;background:var(--bg);color:var(--ink);
  line-height:2;font-size:15.5px;letter-spacing:.03em;overflow-x:hidden;-webkit-font-smoothing:antialiased;
  line-break:strict;word-break:auto-phrase}
p,li,dd,td,.a,.sub,.lead{text-wrap:pretty}
h1,h2,h3,h4{text-wrap:balance;line-break:strict;word-break:auto-phrase}
.nb{white-space:nowrap}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--key);color:#fff}
.lat{font-family:"Archivo",sans-serif;font-weight:800;letter-spacing:.22em;text-transform:uppercase;font-size:.62rem;color:var(--key)}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
.progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--key);z-index:90;transition:width .1s linear}

/* header：白地に細い黒線。スクロールすると下線が出る */
.site-header{position:fixed;inset:0 0 auto 0;z-index:80;display:flex;align-items:center;justify-content:space-between;
  padding:18px var(--pad);transition:background .35s,padding .35s,box-shadow .35s;color:#fff}
.site-header.solid{background:#fff;color:var(--ink);padding-top:12px;padding-bottom:12px;box-shadow:0 1px 0 var(--hair)}
.brand{display:flex;align-items:center;gap:12px}
.brand .mono{width:36px;height:36px;background:var(--key);color:#fff;display:grid;place-items:center;
  font-family:"Archivo",sans-serif;font-weight:900;font-size:1.1rem;flex:none}
.brand .bt b{display:block;font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:.95rem;letter-spacing:.06em}
.brand .bt span{font-family:"Archivo",sans-serif;font-weight:700;font-size:.53rem;letter-spacing:.28em;opacity:.65}
.nav{display:flex;align-items:center;gap:24px}
.nav a{position:relative;font-size:.78rem;font-weight:700;letter-spacing:.08em;padding-bottom:3px}
.nav a:not(.nav-cta)::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--key);transition:width .3s cubic-bezier(.2,.7,.2,1)}
.nav a:not(.nav-cta):hover::after,.nav a[aria-current=page]:not(.nav-cta)::after{width:100%}
.nav .nav-cta{background:var(--key);color:#fff;padding:9px 20px;font-size:.74rem}
.nav .nav-cta:hover{background:var(--ink)}
.nav-toggle{display:none}

/* hero：横帯が上下に開いて写真があらわれる */
.hero{position:relative;min-height:100svh;display:flex;align-items:flex-end;overflow:hidden;background:var(--ink)}
.hero-bands{position:absolute;inset:0;display:grid;grid-template-rows:repeat(5,1fr)}
.hero-bands i{overflow:hidden;position:relative;display:block}
.hero-bands i::before{content:"";position:absolute;left:0;right:0;height:500%;background-image:url("img/hero.jpg");background-size:cover;background-position:center;
  filter:grayscale(.35) brightness(.6) contrast(1.05);transform:scaleY(0);transform-origin:center;transition:transform 1.1s cubic-bezier(.16,1,.3,1)}
.hero-bands i:nth-child(1)::before{top:0}
.hero-bands i:nth-child(2)::before{top:-100%;transition-delay:.1s}
.hero-bands i:nth-child(3)::before{top:-200%;transition-delay:.2s}
.hero-bands i:nth-child(4)::before{top:-300%;transition-delay:.3s}
.hero-bands i:nth-child(5)::before{top:-400%;transition-delay:.4s}
.hero.lit .hero-bands i::before{transform:scaleY(1)}
.hero-inner{position:relative;z-index:3;width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--pad) clamp(4rem,9vw,7rem);color:#fff}
.hero .lat{display:block;margin-bottom:1.2rem;color:#8ea0ff;opacity:0;transform:translateY(10px);transition:opacity .8s .75s,transform .8s .75s}
.hero.lit .lat{opacity:1;transform:none}
.hero h1{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:clamp(2.1rem,6.4vw,4.4rem);line-height:1.35;letter-spacing:.01em;
  filter:blur(14px);opacity:0;transition:filter 1.1s cubic-bezier(.2,.7,.2,1) .8s,opacity 1.1s .8s}
.hero.lit h1{filter:blur(0);opacity:1}
.hero .sub{margin-top:1.8rem;max-width:33rem;color:rgba(255,255,255,.86);font-size:.95rem;opacity:0;transition:opacity 1s 1.15s}
.hero.lit .sub{opacity:1}
.hero-actions{margin-top:2.2rem;display:flex;gap:12px;flex-wrap:wrap;opacity:0;transition:opacity 1s 1.35s}
.hero.lit .hero-actions{opacity:1}

/* ボタン：四角。中を色が左から満たす */
.btn{position:relative;display:inline-flex;align-items:center;gap:.7em;overflow:hidden;
  font-size:.8rem;font-weight:700;letter-spacing:.09em;padding:15px 30px;border:2px solid currentColor;z-index:0}
.btn::before{content:"";position:absolute;inset:0;background:currentColor;transform:scaleX(0);transform-origin:left;transition:transform .4s cubic-bezier(.2,.7,.2,1);z-index:-1}
.btn:hover::before{transform:scaleX(1)}
.btn .t2{display:none}
.btn .ar{font-family:"Archivo",sans-serif;font-weight:900;transition:transform .3s}
.btn:hover .ar{transform:translateX(5px)}
.btn-fill{background:var(--key);border-color:var(--key);color:#fff}
.btn-fill::before{background:var(--ink)}
.btn-line{color:#fff}
.btn-line:hover{color:var(--ink)}
.btn-ink{color:var(--ink)}
.btn-ink:hover{color:#fff}

/* section */
.section{padding:clamp(4.6rem,11vw,8.5rem) 0;position:relative}
.section.gray{background:var(--bg-2)}
.section.dark{background:var(--ink);color:#fff}
.section.dark .lat{color:#8ea0ff}
.sec-head{margin-bottom:clamp(2.2rem,5vw,3.6rem);max-width:46rem}
.sec-head .lat{display:block;margin-bottom:.8rem}
.sec-head h2{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:clamp(1.5rem,4vw,2.6rem);line-height:1.45;letter-spacing:.01em}
.sec-head p{margin-top:1.1rem;color:var(--ink-2)}
.section.dark .sec-head p{color:rgba(255,255,255,.8)}

/* 事業：同じ幅の3枚。ひとつだけ番号を強く */
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:2px solid var(--line)}
.three .c{border-bottom:2px solid var(--line);border-right:1px solid var(--hair);padding:clamp(1.6rem,3.4vw,2.4rem) clamp(1.1rem,2.4vw,1.8rem);
  position:relative;transition:background .35s}
.three .c:last-child{border-right:0}
.three .c:hover{background:var(--bg-2)}
.three .c .n{font-family:"Archivo",sans-serif;font-weight:900;font-size:clamp(2.4rem,5.4vw,3.6rem);line-height:1;color:var(--hair)}
.three .c.lead .n{color:var(--key)}
.three .c.lead .tag{position:absolute;top:clamp(1.7rem,3.4vw,2.6rem);right:clamp(1.1rem,2.4vw,1.8rem);
  background:var(--key);color:#fff;font-size:.6rem;font-weight:700;letter-spacing:.14em;padding:4px 9px;line-height:1.6}
.three .c h3{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:1.02rem;line-height:1.65;margin:1.1rem 0 .8rem}
.three .c p{font-size:.9rem;color:var(--ink-2)}
.three .c p+p{margin-top:.7rem}
.note-line{margin-top:1.8rem;font-size:.79rem;color:var(--ink-3);max-width:46rem}

/* 由来：大きな文字と細い罫だけ。写真は使わない */
.statement{border-left:3px solid var(--key);padding-left:clamp(1.2rem,3vw,2.4rem);max-width:46rem}
.statement .big{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:clamp(1.3rem,3.4vw,2.1rem);line-height:1.65;margin-bottom:1.5rem}
.statement p{color:var(--ink-2);margin-top:.9rem}
.section.dark .statement p{color:rgba(255,255,255,.8)}
.marquee{overflow:hidden;white-space:nowrap;border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);padding:1rem 0;margin-top:clamp(2.4rem,5vw,3.6rem)}
.marquee span{display:inline-block;font-family:"Archivo",sans-serif;font-weight:900;font-size:clamp(1.6rem,4.6vw,3rem);
  letter-spacing:.06em;color:var(--hair);animation:slide 26s linear infinite}
.section.dark .marquee span{color:rgba(255,255,255,.16)}
@keyframes slide{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* 仕事の進め方：横に流れる（下層ページ） */
.hscroll{display:flex;gap:0;overflow-x:auto;scroll-snap-type:x mandatory;border-top:2px solid var(--line);border-bottom:2px solid var(--line);
  -webkit-overflow-scrolling:touch}
.hscroll .s{flex:0 0 clamp(15rem,26vw,19rem);scroll-snap-align:start;border-right:1px solid var(--hair);padding:clamp(1.5rem,3vw,2.2rem) clamp(1.1rem,2.2vw,1.6rem)}
.hscroll .s:last-child{border-right:0}
.hscroll .s .n{font-family:"Archivo",sans-serif;font-weight:900;font-size:2.4rem;line-height:1;color:var(--key)}
.hscroll .s h4{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:.99rem;margin:.9rem 0 .6rem}
.hscroll .s p{font-size:.88rem;color:var(--ink-2)}
.hscroll-hint{margin-top:.9rem;font-size:.73rem;color:var(--ink-3);letter-spacing:.1em}

/* 会社のこと */
.table-info{width:100%;border-collapse:collapse;font-size:.93rem}
.table-info th,.table-info td{border-top:1px solid var(--hair);padding:1.15rem .2rem;text-align:left;vertical-align:top}
.table-info th{width:11rem;font-weight:700;color:var(--ink-3);font-size:.79rem;letter-spacing:.1em}
.table-info tr:last-child td,.table-info tr:last-child th{border-bottom:1px solid var(--hair)}
.section.dark .table-info th,.section.dark .table-info td{border-color:rgba(255,255,255,.22)}
.section.dark .table-info th{color:rgba(255,255,255,.6)}

/* Q&A：番号つき。開閉なしで全部見せる */
.qa{border-top:2px solid var(--line);max-width:48rem}
.qa .i{border-bottom:1px solid var(--hair);padding:1.5rem 0;display:grid;grid-template-columns:3rem 1fr;gap:1rem}
.qa .i .n{font-family:"Archivo",sans-serif;font-weight:900;color:var(--key);font-size:1rem}
.qa .i h4{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:.99rem;margin-bottom:.55rem}
.qa .i p{font-size:.9rem;color:var(--ink-2)}
.section.dark .qa{border-color:rgba(255,255,255,.5)}
.section.dark .qa .i{border-color:rgba(255,255,255,.2)}
.section.dark .qa .i p{color:rgba(255,255,255,.78)}

.cta{background:var(--key);color:#fff;padding:clamp(4rem,9vw,6.5rem) 0}
.cta .lat{color:rgba(255,255,255,.72);display:block}
.cta h2{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:clamp(1.5rem,4vw,2.5rem);margin:.9rem 0 .9rem;line-height:1.45}
.cta p{color:rgba(255,255,255,.85);margin-bottom:2rem;max-width:34rem}
.cta .btn{border-color:#fff;color:#fff}
.cta .btn::before{background:#fff}
.cta .btn:hover{color:var(--key)}

.page-hero{padding:clamp(7.5rem,14vw,10.5rem) var(--pad) clamp(2.4rem,5.5vw,3.8rem);background:var(--ink);color:#fff}
.page-hero .lat{display:block;margin-bottom:.8rem;color:#8ea0ff}
.page-hero h1{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:clamp(1.7rem,4.6vw,3rem);letter-spacing:.02em}

.prose{max-width:46rem}
.prose h2{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:1.08rem;margin:2.5rem 0 .8rem;padding-bottom:.5rem;border-bottom:2px solid var(--line)}
.prose h2:first-child{margin-top:0}
.prose p,.prose li{color:var(--ink-2);font-size:.93rem}
.prose ul,.prose ol{margin:.5rem 0 .5rem 1.4rem}.prose li{margin:.3rem 0}
.prose .stamp{font-size:.78rem;color:var(--ink-3);margin-top:2.2rem}

.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem);max-width:60rem;align-items:start}
.contact-grid h3{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:1rem;padding-bottom:.5rem;border-bottom:2px solid var(--line);margin-bottom:.9rem}
.contact-grid p{line-height:2}
.mail{font-family:"Archivo",sans-serif;font-weight:800;font-size:clamp(1.05rem,2.6vw,1.35rem);letter-spacing:.02em;color:var(--key);margin-top:.3rem}
.tiny{font-size:.78rem;color:var(--ink-3);line-height:1.9;margin-top:.5rem}
.form{display:grid;gap:1.1rem;margin-top:1.2rem}
.form label{font-size:.76rem;font-weight:700;letter-spacing:.09em;color:var(--ink-3);display:block}
.form input,.form textarea{width:100%;border:1px solid var(--hair);padding:.8rem .9rem;font-family:inherit;font-size:.95rem;line-height:1.8;background:#fff;margin-top:.35rem}
.form input:focus,.form textarea:focus{outline:2px solid var(--key);border-color:var(--key)}
.form input:disabled,.form textarea:disabled{background:var(--bg-2);color:var(--ink-3);cursor:not-allowed}
.form .btn{justify-self:start}
.form .btn:disabled{opacity:.4;pointer-events:none}

.site-footer{background:var(--ink);color:rgba(255,255,255,.68);padding:clamp(3.4rem,8vw,5.2rem) var(--pad) 2rem}
.footer-top{max-width:var(--wrap);margin:0 auto;display:flex;justify-content:space-between;gap:2.6rem;flex-wrap:wrap}
.footer-brand .mono{width:40px;height:40px;background:var(--key);color:#fff;display:grid;place-items:center;font-family:"Archivo",sans-serif;font-weight:900;font-size:1.2rem}
.footer-brand b{display:block;margin-top:.9rem;color:#fff;font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:.97rem;letter-spacing:.05em}
.footer-addr{font-size:.8rem;margin-top:.7rem;line-height:1.95}
.footer-nav{display:grid;grid-template-columns:1fr 1fr;gap:.5rem 2.2rem;font-size:.8rem}
.footer-nav a:hover{color:#8ea0ff}
.footer-bottom{max-width:var(--wrap);margin:2.4rem auto 0;padding-top:1.3rem;border-top:1px solid rgba(255,255,255,.2);
  font-family:"Archivo",sans-serif;font-weight:700;font-size:.66rem;letter-spacing:.2em;color:rgba(255,255,255,.5)}

.reveal{opacity:0;transform:translateY(20px);transition:opacity .95s cubic-bezier(.2,.7,.2,1),transform .95s cubic-bezier(.2,.7,.2,1)}
.reveal.on{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.1s}

@media(max-width:960px){
  .three{grid-template-columns:1fr}
  .three .c{border-right:0;border-bottom:1px solid var(--hair)}
  .three .c:last-child{border-bottom:2px solid var(--line)}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:680px){
  .nav a:not(.nav-cta){display:none}
  .nav-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;width:36px;height:30px;background:none;border:0;cursor:pointer}
  .nav-toggle span{display:block;width:22px;height:2px;margin-left:auto;background:currentColor;transition:transform .25s,opacity .2s}
  .nav-toggle.on span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle.on span:nth-child(2){opacity:0}
  .nav-toggle.on span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .nav.menu-open{position:fixed;inset:0;background:#fff;color:var(--ink);flex-direction:column;justify-content:center;align-items:center;gap:1.6rem}
  .nav.menu-open a:not(.nav-cta){display:block;font-size:1.05rem;letter-spacing:.14em}
  .qa .i{grid-template-columns:2.2rem 1fr;gap:.7rem}
  .footer-top{flex-direction:column;gap:1.6rem}.footer-nav{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  .hero-bands i::before{transform:none!important}
  .marquee span{animation:none}
  .reveal,.hero h1,.hero .sub,.hero-actions,.hero .lat{transition:none;opacity:1;transform:none;filter:none}
}

/* 業務内容：主たる仕事だけ大きく、残りは2枚 */
.mainbiz{display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(1.2rem,3.4vw,2.8rem);
  border-top:2px solid var(--line);border-bottom:2px solid var(--line);padding:clamp(1.8rem,4vw,3rem) 0;align-items:start}
.mainbiz .n{font-family:"Archivo",sans-serif;font-weight:900;font-size:clamp(3rem,8vw,5.4rem);line-height:.9;color:var(--key)}
.mainbiz h3{font-family:"Zen Kaku Gothic New",sans-serif;font-weight:900;font-size:clamp(1.2rem,3vw,1.8rem);line-height:1.55;margin-bottom:1rem}
.mainbiz p{font-size:.94rem;color:var(--ink-2);max-width:44rem}
.mainbiz p+p{margin-top:.85rem}
.mainbiz .btn{margin-top:.9rem}
.three.two{grid-template-columns:repeat(2,1fr);border-top:0}
.three.two .c{border-bottom:2px solid var(--line)}
.note-line a{color:inherit;text-decoration:underline;text-underline-offset:3px}
.note-line a:hover{color:var(--key)}
@media(max-width:960px){.three.two{grid-template-columns:1fr}.mainbiz{grid-template-columns:1fr;gap:.4rem}}

/* ---- ロゴ（支給マークの8の部分） ----
   写真の上では明るい面が、白地では濃い面が読めるので、素のまま置く */
.brand img.mono,.footer-brand img.mono{border:0;background:none;padding:0;object-fit:contain;display:block;flex:none}
.brand img.mono{width:34px;height:34px}
.footer-brand img.mono{width:40px;height:40px}