:root{
  --ink:#16201b;--mute:#5f6b65;--line:#e4e9e6;--brand:#2f6f4e;--brand-2:#7fb69a;--bg:#f8faf9;--card:#ffffff;--soft:#eef4f0;
  --shadow:0 10px 30px rgba(22,32,27,.06);--r:16px
}
@media(prefers-color-scheme:dark){:root{--ink:#e8efeb;--mute:#9aa8a1;--line:#243029;--brand:#8fcbaf;--brand-2:#3c8a66;--bg:#0f1512;--card:#151d18;--soft:#18231d;--shadow:0 10px 30px rgba(0,0,0,.35)}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:"Inter","Noto Sans JP",-apple-system,BlinkMacSystemFont,"Hiragino Sans",sans-serif;color:var(--ink);background:var(--bg);line-height:1.85;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 28px}

/* header */
header{position:sticky;top:0;z-index:20;backdrop-filter:saturate(1.4) blur(10px);background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid var(--line);transition:box-shadow .3s}
header.scrolled{box-shadow:var(--shadow)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:700;letter-spacing:.06em;font-size:16px;white-space:nowrap}
.logo .mark{width:28px;height:28px}
.logo small{color:var(--mute);font-weight:500;font-size:12px;letter-spacing:0}
nav{display:flex;gap:6px}
nav a{padding:6px 12px;border-radius:999px;color:var(--mute);font-size:14px;white-space:nowrap;transition:background .2s,color .2s}
nav a:hover,nav a.active{background:var(--soft);color:var(--ink)}
@media(max-width:640px){nav{gap:0}nav a{padding:6px 7px;font-size:12px}.logo small{display:none}.logo{font-size:15px;gap:8px}}

/* hero */
.hero{position:relative;overflow:hidden;min-height:calc(100vh - 66px);display:flex;align-items:center;padding:64px 0}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;width:100%}
@media(max-width:800px){.hero .wrap{grid-template-columns:1fr;gap:28px}.hero{min-height:0;padding:56px 0 40px}}
.hero h1{font-size:clamp(28px,4.6vw,52px);line-height:1.3;margin:0 0 22px;font-weight:700;letter-spacing:-.015em}
.hero h1 .u{display:inline-block}   /* 文節の途中で折らん。折るのは文節の間だけ */
@media(max-width:800px){.hero h1 br{display:none}}
.hero h1 em{font-style:normal;color:var(--brand);position:relative}
.hero p{color:var(--mute);margin:0 0 30px;max-width:600px;font-size:17px}
.cta{display:inline-flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-block;padding:11px 18px;border-radius:999px;font-size:14px;font-weight:600;border:1px solid var(--line);color:var(--ink);background:var(--card);transition:transform .2s,box-shadow .2s}
.btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.bg-grid{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:44px 44px;opacity:.5;mask-image:radial-gradient(ellipse at 70% 40%,#000 20%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse at 70% 40%,#000 20%,transparent 70%);pointer-events:none}

/* ---- ヒーロー: 濃い画像の上に白文字。画像(hero.jpg)が無い間は深緑のグラデで代用 ---- */
.hero.photo{color:#eef4f0;background:#10201a}
.hero.photo::before{content:"";position:absolute;inset:0;background:
  linear-gradient(100deg,rgba(9,16,13,.78) 0%,rgba(9,16,13,.42) 46%,rgba(9,16,13,.08) 100%),
  url("img/hero.jpg") right center/cover no-repeat,
  radial-gradient(60% 80% at 80% 30%,#2f6f4e 0%,#17342a 45%,#0f1512 100%);
  z-index:0}
/* 下の端は次の節の色へなじませる */
.hero.photo::after{content:"";position:absolute;left:0;right:0;bottom:0;height:120px;background:linear-gradient(to bottom,transparent,rgba(9,16,13,.55));z-index:1;pointer-events:none}
@media(max-width:800px){
  /* 縦積み: 文字が上・輪が下。絵の輪は下に寄せて、文字の後ろは暗く保つ */
  .hero.photo::before{background:
    linear-gradient(180deg,rgba(9,16,13,.86) 0%,rgba(9,16,13,.62) 52%,rgba(9,16,13,.18) 100%),
    url("img/hero.jpg") 78% bottom/auto 72% no-repeat,
    #0b120f}
}
.hero.photo .bg-grid{opacity:.18;background-image:linear-gradient(rgba(255,255,255,.35) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.35) 1px,transparent 1px);z-index:1}
.hero.photo .wrap{position:relative;z-index:2}
.hero.photo h1{color:#fff}.hero.photo h1 em{color:#9fd8bb}
.hero.photo p{color:rgba(238,244,240,.82)}
.hero.photo .btn{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.22);color:#fff;backdrop-filter:blur(6px)}
.hero.photo .btn.primary{background:#8fcbaf;border-color:#8fcbaf;color:#0f1512}
.hero.photo .loop .ring{stroke:rgba(255,255,255,.18)}
.hero.photo .loop .flow{stroke:#9fd8bb}
.hero.photo .loop .node circle{fill:rgba(15,21,18,.55);stroke:rgba(255,255,255,.28)}
.hero.photo .loop .node text{fill:rgba(238,244,240,.75)}
.hero.photo .loop .node.on circle{fill:rgba(143,203,175,.18);stroke:#9fd8bb}
.hero.photo .loop .node.on text,.hero.photo .loop .center{fill:#fff}
.hero.photo .loop .center.sub{fill:rgba(238,244,240,.7)}
.hero.photo .loop .node.done circle{stroke:#8fcbaf}
.hero.photo .loop .pulse{fill:#9fd8bb}
.hero.photo .loop-caption{color:rgba(238,244,240,.75)}.hero.photo .loop-caption strong{color:#fff}
header.on-photo{background:color-mix(in srgb,#0f1512 70%,transparent);border-bottom-color:rgba(255,255,255,.08)}
header.on-photo .logo,header.on-photo nav a{color:#eef4f0}header.on-photo .logo small,header.on-photo nav a{color:rgba(238,244,240,.7)}
header.on-photo nav a:hover,header.on-photo nav a.active{background:rgba(255,255,255,.1);color:#fff}

/* loop diagram */
.loop{position:relative;aspect-ratio:1;max-width:520px;margin:0 auto;width:100%}
@media(min-width:801px){.hero .wrap>div:last-child{transform:translateX(6%) scale(1.08)}}
.loop svg{width:100%;height:100%;overflow:visible}
.loop .ring{fill:none;stroke:var(--line);stroke-width:2}
.loop .flow{fill:none;stroke:var(--brand-2);stroke-width:2.5;stroke-dasharray:6 10;animation:dash 6s linear infinite;opacity:.9}
@keyframes dash{to{stroke-dashoffset:-160}}
.loop .node{cursor:pointer}
.loop .node circle{fill:var(--card);stroke:var(--line);stroke-width:2;transition:stroke .3s,fill .3s,r .3s}
.loop .node text{font-size:13px;font-weight:600;fill:var(--mute);text-anchor:middle;dominant-baseline:middle;transition:fill .3s;pointer-events:none}
.loop .node.on circle{stroke:var(--brand);fill:var(--soft)}
.loop .node.on text{fill:var(--ink)}
.loop .node.done circle{stroke:var(--brand)}
.loop .center{text-anchor:middle;dominant-baseline:middle;fill:var(--ink);font-weight:700;font-size:13px}
.loop .center.sub{fill:var(--mute);font-weight:500;font-size:11px}
.loop .pulse{fill:var(--brand);opacity:0}
.loop .pulse.go{animation:pulse 1.2s ease-out}
@keyframes pulse{0%{opacity:.5;r:6}100%{opacity:0;r:26}}
.loop-caption{text-align:center;color:var(--mute);font-size:13px;margin-top:8px;min-height:2.6em;transition:opacity .25s}
.loop-caption strong{color:var(--ink)}
@media(prefers-reduced-motion:reduce){.loop .flow{animation:none}.reveal{opacity:1!important;transform:none!important}}

/* sections */
section{padding:96px 0;border-top:1px solid var(--line);scroll-margin-top:66px}
#contact{scroll-margin-top:90px}
section.soft{background:var(--soft)}
section.dark{background:#0f1512;color:#e8efeb;border-top:0}
section.dark h2{color:var(--brand-2)}section.dark .lead,section.dark .panel{color:#9aa8a1}section.dark .panel strong,section.dark .panel::before{color:#e8efeb}
section.dark .tab{background:#151d18;border-color:#243029;color:#9aa8a1}section.dark .tab[aria-selected="true"]{background:var(--brand-2);color:#0f1512;border-color:var(--brand-2)}
section.dark .term{border:1px solid #243029}
@media(max-width:800px){section{padding:64px 0}}
h2{font-size:13px;letter-spacing:.16em;color:var(--brand);text-transform:uppercase;margin:0 0 10px;font-weight:700}
.h3{font-size:clamp(24px,3.4vw,40px);margin:0 0 14px;font-weight:700;letter-spacing:-.015em;line-height:1.3}
.lead{color:var(--mute);margin:0 0 36px;max-width:680px;font-size:17px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:30px 28px;transition:transform .25s,box-shadow .25s,border-color .25s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--brand-2)}
.card .ico{width:38px;height:38px;border-radius:10px;background:var(--soft);display:grid;place-items:center;margin-bottom:12px;color:var(--brand)}
.card h3{margin:0 0 10px;font-size:20px}.card p{margin:0;color:var(--mute);font-size:14px}
.card ul{margin:0;padding-left:1.15em;color:var(--mute);font-size:15px}.card li{margin:8px 0}
.card li::marker{color:var(--brand-2)}

/* steps (how we work) */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;counter-reset:s}
.step{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:24px 22px;position:relative}
.step::before{counter-increment:s;content:"0" counter(s);font-size:12px;color:var(--brand);font-weight:700;letter-spacing:.1em}
.step h4{margin:6px 0 6px;font-size:17px}.step p{margin:0;color:var(--mute);font-size:14px}

/* product */
.product{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
@media(max-width:800px){.product{grid-template-columns:1fr}}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 14px}
.tab{padding:7px 12px;border-radius:999px;border:1px solid var(--line);background:var(--card);font-size:13px;cursor:pointer;color:var(--mute)}
.tab[aria-selected="true"]{background:var(--brand);color:#fff;border-color:var(--brand)}
.panel{color:var(--mute);font-size:14px;margin:0 0 14px}.panel::before{content:attr(data-label);display:block;font-weight:700;color:var(--ink);font-size:13px;margin-bottom:2px}
.js .panel{display:none;margin:0}.js .panel::before{display:none}.js .panel[data-on]{display:block}
.tabs{display:none}.js .tabs{display:flex}
.panel strong{color:var(--ink)}
.term{background:#0b100d;color:#cfe3d8;border-radius:16px;padding:20px 22px;font:14px/1.75 ui-monospace,SFMono-Regular,Menlo,monospace;box-shadow:var(--shadow);min-height:220px;white-space:pre-wrap}
.term .ok{color:#8fcbaf}.term .dim{color:#7d8f86}.term .cur::after{content:"▍";animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}

/* company */
dl{display:grid;grid-template-columns:9em 1fr;gap:10px 18px;margin:0}dt{color:var(--mute)}dd{margin:0}
@media(max-width:600px){dl{grid-template-columns:1fr}dt{margin-top:8px}}
.contact{margin-top:34px;padding:34px;border-radius:24px;background:var(--card);border:1px solid var(--line);display:grid;grid-template-columns:.8fr 1.2fr;gap:36px;align-items:start}
@media(max-width:800px){.contact{grid-template-columns:1fr;padding:24px}}
.contact p{margin:0 0 10px;color:var(--mute);font-size:15px}.contact .alt{font-size:13px}
.form{display:grid;gap:14px}
.form label{display:grid;gap:6px;font-size:13px;color:var(--mute);font-weight:600}
.form input,.form textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--ink);font:inherit;font-size:15px;transition:border-color .2s,box-shadow .2s}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 14%,transparent)}
.form input::placeholder,.form textarea::placeholder{color:color-mix(in srgb,var(--mute) 55%,transparent)}
.form textarea{resize:vertical}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media(max-width:600px){.row2{grid-template-columns:1fr}}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-foot{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:4px}
.form-msg{font-size:13px;color:var(--mute)}.form-msg.ok{color:var(--brand)}.form-msg.ng{color:#b4423f}
.form.busy button{opacity:.6;pointer-events:none}
.form input.bad,.form textarea.bad{border-color:#b4423f}

/* reveal */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.js .reveal.in{opacity:1;transform:none}

footer{border-top:1px solid var(--line);padding:28px 0;color:var(--mute);font-size:13px}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.prose h2{text-transform:none;letter-spacing:0;font-size:18px;color:var(--ink);margin:30px 0 10px}
.prose p,.prose li{font-size:15px}