/* ============================================================
   合同会社オアシス
   軸: 定款4 コンピュータのソフトウェアの企画・開発・制作・販売及び保守
   構成: hero=社名を大きく断ち切りで見せる / 図版=色の面と写真を重ねる /
        事業=番号つきの一覧 / 進め方=縦の罫でつなぐ / できること一覧あり
   動き: 登場=文字が下から起き上がる／色の面が横に開く
        ・ スクロール=縦罫が上から伸びる ・ ホバー=丸い点が広がって色が反転する
   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:#f4f6f5;
  --bg-2:#ffffff;
  --sumi:#12161a;
  --ink:#1b2126;
  --ink-2:#4e585f;
  --ink-3:#86909a;
  --mizu:#178a76;
  --mizu-l:#33bda3;
  --hair:rgba(27,33,38,.13);
  --wrap:1140px;
  --pad:clamp(1.3rem,4.5vw,4.2rem);
}
*{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:2.05;font-size:15.5px;letter-spacing:.035em;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(--mizu);color:#fff}
.maru{font-family:"Zen Maru Gothic",sans-serif}
.lat{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;letter-spacing:.24em;text-transform:uppercase;font-size:.65rem;color:var(--mizu)}
.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(--mizu);z-index:90;border-radius:0 3px 3px 0;transition:width .1s linear}

/* header */
.site-header{position:fixed;inset:0 0 auto 0;z-index:80;display:flex;align-items:center;justify-content:space-between;
  padding:19px var(--pad);transition:background .4s,padding .4s;color:var(--ink)}
.site-header.solid{background:rgba(244,246,245,.94);backdrop-filter:blur(9px);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(--mizu);color:#fff;border-radius:50%;display:grid;place-items:center;
  font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:1rem;flex:none}
.brand .bt b{display:block;font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:.95rem;letter-spacing:.09em}
.brand .bt span{font-family:"Zen Maru Gothic",sans-serif;font-size:.55rem;letter-spacing:.26em;color:var(--ink-3)}
.nav{display:flex;align-items:center;gap:24px}
.nav a{font-size:.79rem;letter-spacing:.1em}
.nav a:not(.nav-cta):hover,.nav a[aria-current=page]:not(.nav-cta){color:var(--mizu)}
.nav .nav-cta{position:relative;overflow:hidden;border:1.5px solid var(--mizu);color:var(--mizu);border-radius:999px;padding:8px 20px;font-size:.73rem;z-index:0}
.nav .nav-cta::before{content:"";position:absolute;left:50%;top:50%;width:0;height:0;background:var(--mizu);border-radius:50%;
  transform:translate(-50%,-50%);transition:width .4s cubic-bezier(.2,.7,.2,1),height .4s cubic-bezier(.2,.7,.2,1);z-index:-1}
.nav .nav-cta:hover{color:#fff}
.nav .nav-cta:hover::before{width:260px;height:260px}
.nav-toggle{display:none}

/* hero：社名を大きく断ち切りで見せる */
.hero{position:relative;padding:clamp(8.5rem,17vw,12.5rem) 0 clamp(4rem,9vw,7rem);overflow:hidden;background:var(--bg)}
.hero-mark{position:absolute;left:-2.5vw;bottom:-1.5vw;font-family:"Zen Maru Gothic",sans-serif;font-weight:700;
  font-size:clamp(7rem,22vw,19rem);line-height:.78;letter-spacing:-.02em;color:rgba(23,138,118,.09);white-space:nowrap;pointer-events:none;
  transform:translateY(24%);opacity:0;transition:transform 1.6s cubic-bezier(.16,1,.3,1) .3s,opacity 1.3s .3s}
.hero.lit .hero-mark{transform:translateY(0);opacity:1}
.hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:clamp(1.8rem,5vw,4rem);align-items:center}
.hero .lat{display:block;margin-bottom:1.2rem;opacity:0;transition:opacity .9s .55s}
.hero.lit .lat{opacity:1}
.hero h1{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:clamp(1.9rem,5.2vw,3.5rem);line-height:1.6;letter-spacing:.02em}
.hero h1 .ln{display:block;overflow:hidden}
.hero h1 .ln em{display:block;font-style:normal;transform:translateY(108%);transition:transform 1s cubic-bezier(.16,1,.3,1) .5s}
.hero h1 .ln:nth-child(2) em{transition-delay:.62s}
.hero.lit h1 .ln em{transform:none}
.hero .sub{margin-top:1.8rem;max-width:31rem;color:var(--ink-2);font-size:.95rem;opacity:0;transition:opacity 1s 1s}
.hero.lit .sub{opacity:1}
.hero-actions{margin-top:2.3rem;display:flex;gap:13px;flex-wrap:wrap;opacity:0;transition:opacity 1s 1.2s}
.hero.lit .hero-actions{opacity:1}
.hero-fig{position:relative;border-radius:14px;overflow:hidden;background:var(--mizu)}
.hero-fig img{width:100%;aspect-ratio:5/6;object-fit:cover;filter:saturate(.85)}
.hero-fig::after{content:"";position:absolute;inset:0;background:var(--bg);transform-origin:right;
  transition:transform 1.25s cubic-bezier(.76,0,.24,1) .35s}
.hero.lit .hero-fig::after{transform:scaleX(0)}

/* ボタン：丸い点が広がって色が反転する */
.btn{position:relative;overflow:hidden;display:inline-flex;align-items:center;gap:.7em;font-size:.81rem;letter-spacing:.1em;
  padding:14px 28px;border:1.5px solid currentColor;border-radius:999px;z-index:0;transition:color .3s}
.btn::before{content:"";position:absolute;left:50%;top:50%;width:0;height:0;background:currentColor;border-radius:50%;
  transform:translate(-50%,-50%);transition:width .5s cubic-bezier(.2,.7,.2,1),height .5s cubic-bezier(.2,.7,.2,1);z-index:-1}
.btn:hover::before{width:420px;height:420px}
.btn .ar{transition:transform .35s}
.btn:hover .ar{transform:translateX(5px)}
.btn .t2{display:none}
.btn-fill{background:var(--mizu);border-color:var(--mizu);color:#fff}
.btn-fill::before{background:var(--sumi)}
.btn-mizu{color:var(--mizu)}
.btn-mizu:hover{color:#fff}
.btn-line{color:#fff}
.btn-line:hover{color:var(--sumi)}

/* section */
.section{padding:clamp(4.6rem,11vw,8.6rem) 0;position:relative}
.section.white{background:var(--bg-2)}
.section.sumi{background:var(--sumi);color:#eef2f1}
.section.sumi .lat{color:var(--mizu-l)}
.sec-head{margin-bottom:clamp(2.2rem,5vw,3.6rem);max-width:45rem}
.sec-head .lat{display:block;margin-bottom:.8rem}
.sec-head h2{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:clamp(1.45rem,3.6vw,2.35rem);line-height:1.6;letter-spacing:.03em}
.sec-head p{margin-top:1.1rem;color:var(--ink-2)}
.section.sumi .sec-head p{color:rgba(238,242,241,.82)}

/* 大切にしていること：色の面と写真を重ねる */
.blockfig{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:clamp(1.6rem,4.5vw,3.4rem);align-items:center}
.blockfig .stack{position:relative;padding:0 0 clamp(1.6rem,4vw,2.6rem) clamp(1.6rem,4vw,2.6rem)}
.blockfig .stack::before{content:"";position:absolute;left:0;bottom:0;width:72%;height:72%;background:var(--mizu);border-radius:12px;
  transform:scaleX(0);transform-origin:left;transition:transform 1.1s cubic-bezier(.76,0,.24,1)}
.reveal.on .blockfig .stack::before,.blockfig.reveal.on .stack::before{transform:scaleX(1)}
.blockfig .stack img{position:relative;border-radius:12px;width:100%;aspect-ratio:4/3;object-fit:cover;filter:saturate(.86)}
.blockfig .big{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:clamp(1.3rem,3.3vw,2.05rem);line-height:1.7;margin-bottom:1.3rem}
.blockfig p{color:var(--ink-2);margin-top:.95rem}
.section.sumi .blockfig p{color:rgba(238,242,241,.82)}

/* 事業内容：番号つきの一覧 */
.numlist{counter-reset:n;border-top:1px solid var(--hair)}
.section.sumi .numlist{border-color:rgba(238,242,241,.22)}
.numlist .it{border-bottom:1px solid var(--hair);padding:clamp(1.6rem,3.6vw,2.5rem) 0;
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(1.1rem,3vw,2.4rem);align-items:start}
.section.sumi .numlist .it{border-color:rgba(238,242,241,.22)}
.numlist .it::before{counter-increment:n;content:counter(n,decimal-leading-zero);
  font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:1.15rem;color:var(--mizu);min-width:2.2rem;line-height:1.85}
.section.sumi .numlist .it::before{color:var(--mizu-l)}
.numlist .it h3{font-family:"Shippori Mincho B1",serif;font-weight:600;font-size:1.06rem;line-height:1.75;margin-bottom:.75rem;letter-spacing:.04em}
.numlist .it .mark{display:inline-block;margin-left:.7em;font-family:"Zen Maru Gothic",sans-serif;font-size:.6rem;letter-spacing:.14em;
  color:#fff;background:var(--mizu);border-radius:999px;padding:3px 11px;vertical-align:middle;line-height:1.8}
.numlist .it p{color:var(--ink-2);font-size:.92rem}
.section.sumi .numlist .it p{color:rgba(238,242,241,.8)}
.numlist .it p+p{margin-top:.75rem}
.note-line{margin-top:1.9rem;font-size:.79rem;color:var(--ink-3);max-width:45rem}
.section.sumi .note-line{color:rgba(238,242,241,.6)}

/* ご依頼までの道のり：縦の罫でつなぐ */
.rules{position:relative;padding-left:clamp(1.6rem,4vw,2.6rem);max-width:46rem}
.rules::before{content:"";position:absolute;left:0;top:.6rem;bottom:.6rem;width:2px;background:var(--hair)}
.rules::after{content:"";position:absolute;left:0;top:.6rem;width:2px;height:0;background:var(--mizu);transition:height 1.6s cubic-bezier(.2,.7,.2,1)}
.reveal.on .rules::after,.rules.reveal.on::after{height:calc(100% - 1.2rem)}
.section.sumi .rules::before{background:rgba(238,242,241,.22)}
.section.sumi .rules::after{background:var(--mizu-l)}
.rules .s{position:relative;padding:0 0 clamp(1.6rem,3.4vw,2.4rem)}
.rules .s:last-child{padding-bottom:0}
.rules .s::before{content:"";position:absolute;left:calc(-1 * clamp(1.6rem,4vw,2.6rem) - 4px);top:.75rem;width:10px;height:10px;
  border-radius:50%;background:var(--mizu);box-shadow:0 0 0 4px var(--bg)}
.section.white .rules .s::before{box-shadow:0 0 0 4px var(--bg-2)}
.section.sumi .rules .s::before{background:var(--mizu-l);box-shadow:0 0 0 4px var(--sumi)}
.rules .s .st{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:.66rem;letter-spacing:.2em;color:var(--mizu)}
.section.sumi .rules .s .st{color:var(--mizu-l)}
.rules .s h4{font-family:"Shippori Mincho B1",serif;font-weight:600;font-size:1.03rem;margin:.35rem 0 .4rem;letter-spacing:.04em}
.rules .s p{font-size:.91rem;color:var(--ink-2)}
.section.sumi .rules .s p{color:rgba(238,242,241,.8)}

/* できること一覧 */
.scope{display:flex;flex-wrap:wrap;gap:.65rem}
.scope span{border:1px solid var(--hair);border-radius:999px;padding:8px 19px;font-size:.83rem;color:var(--ink-2);background:var(--bg-2)}
.section.white .scope span{background:var(--bg)}
.section.sumi .scope span{background:rgba(255,255,255,.07);border-color:rgba(238,242,241,.22);color:rgba(238,242,241,.86)}

/* 会社案内 */
.table-info{width:100%;border-collapse:collapse;font-size:.93rem}
.table-info th,.table-info td{border-top:1px solid var(--hair);padding:1.2rem .2rem;text-align:left;vertical-align:top}
.table-info th{width:11rem;font-weight:700;color:var(--ink-3);font-size:.8rem;letter-spacing:.1em;font-family:"Zen Maru Gothic",sans-serif}
.table-info tr:last-child td,.table-info tr:last-child th{border-bottom:1px solid var(--hair)}

/* よくいただくお問い合わせ：2列に並べる */
.qgrid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1rem,2.6vw,1.8rem)}
.qgrid .q{background:var(--bg-2);border-radius:12px;padding:clamp(1.3rem,2.8vw,1.9rem);border:1px solid var(--hair)}
.section.white .qgrid .q{background:var(--bg)}
.qgrid .q h4{font-family:"Shippori Mincho B1",serif;font-weight:600;font-size:.99rem;line-height:1.75;margin-bottom:.6rem;
  padding-left:1.5rem;position:relative}
.qgrid .q h4::before{content:"Q";position:absolute;left:0;top:0;font-family:"Zen Maru Gothic",sans-serif;color:var(--mizu);font-size:.9rem}
.qgrid .q p{font-size:.9rem;color:var(--ink-2)}

.cta{background:var(--sumi);color:#eef2f1;padding:clamp(4.2rem,10vw,7rem) 0}
.cta .lat{color:var(--mizu-l);display:block}
.cta h2{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:clamp(1.45rem,3.6vw,2.3rem);margin:1rem 0 .9rem;line-height:1.6}
.cta p{color:rgba(238,242,241,.82);margin-bottom:2.1rem;max-width:33rem}

.page-hero{padding:clamp(7.6rem,14vw,10.5rem) var(--pad) clamp(2.4rem,5.5vw,3.9rem);background:var(--sumi);color:#eef2f1}
.page-hero .lat{display:block;margin-bottom:.8rem;color:var(--mizu-l)}
.page-hero h1{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:clamp(1.65rem,4.4vw,2.8rem);letter-spacing:.05em}

.prose{max-width:45rem}
.prose h2{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:1.07rem;margin:2.5rem 0 .85rem;padding-bottom:.5rem;border-bottom:1px solid var(--hair)}
.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 Maru Gothic",sans-serif;font-weight:700;font-size:1rem;color:var(--mizu);
  padding-bottom:.5rem;border-bottom:1px solid var(--hair);margin-bottom:.9rem}
.contact-grid p{line-height:2}
.mail{font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:clamp(1.05rem,2.6vw,1.32rem);letter-spacing:.02em;color:var(--mizu);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;letter-spacing:.09em;color:var(--ink-3);display:block}
.form input,.form textarea{width:100%;border:1px solid var(--hair);border-radius:8px;padding:.8rem .9rem;font-family:inherit;font-size:.95rem;
  line-height:1.8;background:var(--bg-2);margin-top:.35rem}
.form input:focus,.form textarea:focus{outline:2px solid var(--mizu);border-color:var(--mizu)}
.form input:disabled,.form textarea:disabled{background:#e9edec;color:var(--ink-3);cursor:not-allowed}
.form .btn{justify-self:start}
.form .btn:disabled{opacity:.4;pointer-events:none}

.site-footer{background:var(--sumi);color:rgba(238,242,241,.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:42px;height:42px;background:var(--mizu);color:#fff;border-radius:50%;display:grid;place-items:center;
  font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:1.1rem}
.footer-brand b{display:block;margin-top:.9rem;color:#fff;font-family:"Zen Maru Gothic",sans-serif;font-weight:700;font-size:.96rem;letter-spacing:.07em}
.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:var(--mizu-l)}
.footer-bottom{max-width:var(--wrap);margin:2.4rem auto 0;padding-top:1.3rem;border-top:1px solid rgba(238,242,241,.2);
  font-family:"Zen Maru Gothic",sans-serif;font-size:.68rem;letter-spacing:.2em;color:rgba(238,242,241,.5)}

.reveal{opacity:0;transform:translateY(22px);transition:opacity 1s cubic-bezier(.2,.7,.2,1),transform 1s cubic-bezier(.2,.7,.2,1)}
.reveal.on{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.12s}

@media(max-width:960px){
  .hero .wrap{grid-template-columns:1fr}
  .hero-fig{order:-1;max-width:28rem}
  .hero-fig img{aspect-ratio:16/10}
  .blockfig{grid-template-columns:1fr}
  .qgrid{grid-template-columns:1fr}
  .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;border-radius: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:var(--bg);flex-direction:column;justify-content:center;align-items:center;gap:1.7rem}
  .nav.menu-open a:not(.nav-cta){display:block;font-size:1.05rem;letter-spacing:.15em}
  .numlist .it{grid-template-columns:1fr;gap:.3rem}
  .footer-top{flex-direction:column;gap:1.6rem}.footer-nav{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  .reveal,.hero h1 .ln em,.hero .sub,.hero-actions,.hero .lat,.hero-mark,.hero-fig::after,.blockfig .stack::before,.rules::after{
    transition:none;opacity:1;transform:none}
  .hero-fig::after{display:none}
  .rules::after{height:calc(100% - 1.2rem)}
}

.note-line a{color:var(--mizu);text-decoration:underline;text-underline-offset:3px}
.section.sumi .note-line a{color:var(--mizu-l)}

/* ---- ロゴ（支給マークの円と葉の部分） ----
   淡い緑なので、墨色の丸い台座に載せて形が立つようにする */
.brand img.mono,.footer-brand img.mono{border:0;background:var(--sumi);border-radius:50%;
  padding:4px;object-fit:contain;display:block;flex:none}
.brand img.mono{width:36px;height:36px}
.footer-brand img.mono{width:42px;height:42px;background:rgba(255,255,255,.08)}
.brand img.mono{transition:box-shadow .35s}
.brand:hover img.mono{box-shadow:0 0 0 3px rgba(23,138,118,.3)}