/* Lead Links — site styles
   Layout: 紙と黒インクに蛍光マーカー1色。AIの回答と「出典」をモチーフに、表・注釈・罫線で組む */
:root{
  --paper:#f4f5f6;
  --sheet:#ffffff;
  --ink:#16181b;
  --ink-2:#50565e;
  --ink-3:#7a8088;
  --rule:#d8dce0;
  --rule-soft:#e8eaed;
  --marker:#f3df3c;
  --marker-ink:#16181b;
  --night:#16181b;
  --night-2:#22262b;
  --night-ink:#eef0f2;
  --night-sub:#a9b0b8;
  --f-display:"Zen Kaku Gothic Antique","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  --f-body:"IBM Plex Sans JP","Hiragino Sans","Yu Gothic",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,Consolas,monospace;
  --wrap:1200px;
  --gut:clamp(18px,4vw,40px);
  --header-h:68px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 12px)}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.85;letter-spacing:.02em;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:900;margin:0;text-wrap:balance;word-break:auto-phrase;letter-spacing:.01em}
p{margin:0}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gut)}
.mono{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.07em}
.mk{background:linear-gradient(transparent 60%,var(--marker) 60%,var(--marker) 92%,transparent 92%);-webkit-box-decoration-break:clone;box-decoration-break:clone}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.6em;font-family:var(--f-body);font-weight:600;font-size:.94rem;padding:.95em 1.5em;text-decoration:none;line-height:1.25;border:1.5px solid var(--ink);cursor:pointer;transition:background .2s,color .2s,border-color .2s}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:#000}
.btn-primary .arw{display:inline-grid;place-items:center;width:1.5em;height:1.5em;background:var(--marker);color:var(--marker-ink);font-size:.8rem}
.btn-secondary{background:var(--sheet);color:var(--ink)}
.btn-secondary:hover{background:var(--marker);border-color:var(--marker)}
.btn-marker{background:var(--marker);color:var(--marker-ink);border-color:var(--marker)}
.btn-marker:hover{background:#fff;border-color:#fff}
.btn-sm{padding:.6em 1.1em;font-size:.84rem}
.textlink{font-weight:600;text-decoration:none;border-bottom:2px solid var(--marker);padding-bottom:1px}
.textlink:hover{background:var(--marker)}

/* header */
.site-header{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid var(--rule-soft)}
.site-header .wrap{display:flex;align-items:center;gap:28px;height:var(--header-h)}
.logo{font-family:var(--f-display);font-weight:900;font-size:1.22rem;text-decoration:none;letter-spacing:.02em;margin-right:auto;white-space:nowrap}
.gnav{display:flex;align-items:center;gap:26px;font-size:.86rem}
.gnav a{text-decoration:none;color:var(--ink-2)}
.gnav a:hover,.gnav a[aria-current="page"]{color:var(--ink)}
.gnav a[aria-current="page"]{box-shadow:inset 0 -2px 0 var(--marker)}
.gnav a.btn-primary,.gnav a.btn-primary:hover{color:#fff}
.menu-btn{display:none;font:inherit;font-size:.8rem;background:none;border:1px solid var(--rule);padding:.45em .8em;cursor:pointer;color:var(--ink)}
@media (max-width:900px){
  .gnav{display:none;position:absolute;left:0;right:0;top:var(--header-h);flex-direction:column;align-items:stretch;gap:0;background:var(--sheet);border-bottom:1px solid var(--rule);padding:8px var(--gut) 18px}
  .gnav a{padding:12px 0;border-bottom:1px solid var(--rule-soft);font-size:.95rem}
  .gnav .btn{margin-top:12px;color:#fff;border-bottom:1.5px solid var(--ink)}
  .site-header.open .gnav{display:flex}
  .menu-btn{display:inline-block}
}

/* FV */
.fv{position:relative;isolation:isolate;min-height:min(720px,calc(100svh - var(--header-h)));display:flex;flex-direction:column;background:#f6f7f8;overflow:hidden}
/* 写真は右側に置き、頭が切れないよう上寄せ。左端は白へ溶かす */
.fv-photo{position:absolute;top:0;right:0;bottom:0;width:64%;height:100%;object-fit:cover;object-position:40% 18%;z-index:-2}
.fv::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#f6f7f8 0%,#f6f7f8 36%,rgba(246,247,248,.85) 44%,rgba(246,247,248,0) 58%)}
.fv-copy{flex:1;padding-block:clamp(56px,7vw,96px) 48px;max-width:720px}
.kicker{display:inline-block;font-size:.95rem;font-weight:600;color:var(--ink-2);border-bottom:2px solid var(--marker);padding-bottom:3px}
.fv h1{font-size:clamp(2.2rem,4.4vw,3.7rem);line-height:1.38;margin-top:20px}
.fv-sub{margin-top:26px;color:var(--ink-2);font-size:clamp(1rem,1.25vw,1.14rem);line-height:1.95;max-width:27em}
.fv .ctas{margin-top:36px;gap:14px}
.fv .btn{font-size:1.02rem;padding:1.05em 1.7em}
.ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.ctas small{display:block;width:100%;font-size:.84rem;color:var(--ink-2)}
.chat{position:absolute;right:max(var(--gut),calc((100% - var(--wrap))/2 + var(--gut)));bottom:80px;width:min(470px,36%);background:var(--sheet);font-size:1rem;box-shadow:0 28px 56px -24px rgba(22,24,27,.45);border:1px solid rgba(22,24,27,.08)}
.chat-hd{display:flex;justify-content:space-between;padding:13px 22px;border-bottom:1px solid var(--rule-soft);color:var(--ink-3);font-family:var(--f-mono);font-size:.82rem}
.chat-q{padding:20px 22px 12px;font-weight:700;font-size:1.25rem;line-height:1.55;min-height:3.6em;transition:opacity .35s}
.chat ol{list-style:none;margin:0;padding:6px 22px 22px;display:grid;gap:10px;transition:opacity .35s}
.chat li{display:flex;justify-content:space-between;gap:10px;border:1px solid var(--rule-soft);padding:12px 14px;font-family:var(--f-mono);font-size:.92rem;color:var(--ink-2)}
.chat li.you{border:1.5px dashed var(--ink);font-family:var(--f-body);font-weight:700;font-size:1.02rem;background:var(--marker);color:var(--marker-ink)}
.chat.fade .chat-q,.chat.fade ol{opacity:0}
.fv-strip{background:rgba(255,255,255,.95);border-top:1px solid var(--rule-soft)}
.fv-strip .wrap{display:flex;flex-wrap:wrap;gap:8px 30px;align-items:center;padding-block:18px;font-size:.9rem;color:var(--ink-2)}
.fv-strip b{color:var(--ink);font-weight:600}
@media (max-width:1100px){.fv-photo{width:72%}.chat{width:min(440px,44%)}.fv::before{background:linear-gradient(90deg,#f6f7f8 0%,#f6f7f8 40%,rgba(246,247,248,.85) 50%,rgba(246,247,248,0) 66%)}}
@media (max-width:900px){
  .fv{min-height:0}
  .fv::before{display:none}
  .fv-photo{position:relative;top:auto;right:auto;bottom:auto;width:100%;height:340px;order:2;object-position:50% 20%}
  .fv-copy{order:1;padding-block:32px 28px}
  .chat{position:relative;right:auto;bottom:auto;width:auto;margin:-72px var(--gut) 0;order:3}
  .fv-strip{order:4;margin-top:20px}
}

/* sections */
.sec{padding-block:clamp(72px,10vw,120px);border-top:1px solid var(--rule)}
.sec.tint{background:var(--sheet)}
.sec-head{display:grid;grid-template-columns:200px minmax(0,1fr);gap:24px;margin-bottom:clamp(36px,5vw,56px)}
.sec-head .mono{color:var(--ink-3);padding-top:.8em}
.sec-head h2{font-size:clamp(1.65rem,3.3vw,2.5rem);line-height:1.42}
.sec-head p{margin-top:16px;color:var(--ink-2);max-width:40em}
@media (max-width:760px){.sec-head{grid-template-columns:1fr;gap:8px}}

/* columns of three facts */
.facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--ink)}
.fact{padding:26px 26px 30px 0;display:grid;gap:10px;align-content:start;min-width:0}
.fact+.fact{padding-left:26px;border-left:1px solid var(--rule)}
.fact .mono{color:var(--ink-3)}
.fact h3{font-size:1.2rem;line-height:1.55;font-weight:700}
.fact p{color:var(--ink-2);font-size:.93rem}
@media (max-width:860px){.facts{grid-template-columns:1fr}.fact,.fact+.fact{padding:22px 0;border-left:0;border-bottom:1px solid var(--rule)}}

/* photo band */
.band{margin:0 0 clamp(36px,5vw,56px);aspect-ratio:21/8;overflow:hidden;background:var(--rule)}
.band img{width:100%;height:100%;object-fit:cover}
@media (max-width:640px){.band{aspect-ratio:3/2}}

/* steps + sample table */
.diag{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:clamp(28px,4vw,56px);align-items:start}
.steps{margin:0;padding:0;list-style:none;counter-reset:s;border-top:1px solid var(--ink)}
.steps li{counter-increment:s;display:grid;grid-template-columns:3em minmax(0,1fr);padding:18px 0;border-bottom:1px solid var(--rule)}
.steps li::before{content:counter(s,decimal-leading-zero);font-family:var(--f-mono);font-size:.8rem;color:var(--ink-3);padding-top:.25em}
.steps strong{display:block;font-weight:600}
.steps span{color:var(--ink-2);font-size:.92rem}
.table-box{overflow-x:auto;border:1px solid var(--rule);background:var(--sheet)}
.table-box table{border-collapse:collapse;width:100%;min-width:560px;font-size:.86rem}
.table-box caption{caption-side:top;text-align:left;padding:12px 16px;border-bottom:1px solid var(--rule);color:var(--ink-3);font-family:var(--f-mono);font-size:.72rem;letter-spacing:.06em}
.table-box th,.table-box td{padding:11px 14px;border-bottom:1px solid var(--rule-soft);text-align:left;vertical-align:top}
.table-box thead th{font-family:var(--f-mono);font-weight:500;font-size:.7rem;letter-spacing:.06em;color:var(--ink-3)}
.table-box td.c{text-align:center;font-family:var(--f-mono);font-variant-numeric:tabular-nums;white-space:nowrap}
.hit{background:var(--marker);color:var(--marker-ink);padding:1px 6px}
.miss{color:var(--ink-3)}
.table-box tfoot td{font-family:var(--f-mono);font-size:.78rem;color:var(--ink-2);border-bottom:0}
.note{font-size:.8rem;color:var(--ink-3);margin-top:10px}
@media (max-width:900px){.diag{grid-template-columns:minmax(0,1fr) !important}}

/* service list */
.svc{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border:1px solid var(--rule);background:var(--sheet)}
.svc-item{padding:clamp(22px,3vw,34px);display:grid;gap:12px;align-content:start;min-width:0;border-bottom:1px solid var(--rule)}
.svc-item:nth-child(odd){border-right:1px solid var(--rule)}
.svc-item:nth-last-child(-n+2){border-bottom:0}
.svc-item .top{display:flex;justify-content:space-between;gap:12px;align-items:baseline}
.svc-item h3{font-size:1.3rem;line-height:1.5}
.svc-item .price{font-family:var(--f-mono);font-size:.8rem;white-space:nowrap;color:var(--ink-2)}
.svc-item p{color:var(--ink-2);font-size:.93rem}
.svc-item ul{margin:0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.svc-item li{font-size:.76rem;border:1px solid var(--rule);padding:2px 8px;color:var(--ink-2)}
.svc-item .textlink{justify-self:start;font-size:.9rem}
@media (max-width:760px){.svc{grid-template-columns:1fr}.svc-item:nth-child(odd){border-right:0}.svc-item:nth-last-child(2){border-bottom:1px solid var(--rule)}}

/* principles with sidenotes */
.principles{border-top:1px solid var(--ink)}
.pr{display:grid;grid-template-columns:200px minmax(0,1fr) 260px;gap:24px;padding:28px 0;border-bottom:1px solid var(--rule)}
.pr>.mono{color:var(--ink-3);padding-top:.35em}
.pr h3{font-size:1.22rem;line-height:1.55;font-weight:700}
.pr p{margin-top:10px;color:var(--ink-2);max-width:36em}
.pr aside{font-size:.83rem;color:var(--ink-2);border-left:1px solid var(--rule);padding-left:16px;line-height:1.75}
.pr aside .mono{display:block;margin-bottom:4px;color:var(--ink-3)}
@media (max-width:980px){.pr{grid-template-columns:1fr;gap:10px}.pr aside{border-left:0;padding-left:0;border-top:1px dashed var(--rule);padding-top:12px}}

/* pricing */
.prices{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--rule);background:var(--sheet)}
.p{padding:26px 22px;display:flex;flex-direction:column;gap:14px;min-width:0}
.p+.p{border-left:1px solid var(--rule)}
.p h3{font-size:1rem;font-weight:700;font-family:var(--f-body)}
.p .amt{font-family:var(--f-display);font-weight:900;font-size:1.9rem;line-height:1.1;font-variant-numeric:tabular-nums}
.p .amt small{font-family:var(--f-body);font-weight:500;font-size:.76rem;color:var(--ink-2);display:block;margin-bottom:6px}
.p ul{margin:0;padding:0;list-style:none;font-size:.85rem;color:var(--ink-2);display:grid;gap:6px}
.p li{padding-left:1em;text-indent:-1em}
.p li::before{content:"・"}
@media (max-width:980px){.prices{grid-template-columns:repeat(2,minmax(0,1fr))}.p:nth-child(3){border-left:0}.p:nth-child(n+3){border-top:1px solid var(--rule)}}
@media (max-width:560px){.prices{grid-template-columns:1fr}.p+.p{border-left:0;border-top:1px solid var(--rule)}}

/* dark band for the other line of business */
.night{background:var(--night);color:var(--night-ink);border-top:0}
.night .sec-head .mono,.night .sec-head p{color:var(--night-sub)}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(28px,5vw,64px);align-items:center}
.split figure{margin:0;aspect-ratio:4/5;overflow:hidden;background:var(--night-2)}
.split figure img{width:100%;height:100%;object-fit:cover}
.cases{list-style:none;margin:0;padding:0;border-top:1px solid #3a3f45}
.cases li{display:grid;grid-template-columns:minmax(0,1fr);gap:4px;padding:18px 0;border-bottom:1px solid #3a3f45}
.cases strong{font-weight:600;font-size:1.05rem}
.cases span{color:var(--night-sub);font-size:.9rem}
.night .ctas{margin-top:28px}
.night .btn-secondary{background:transparent;color:var(--night-ink);border-color:var(--night-ink)}
.night .btn-secondary:hover{background:var(--night-ink);color:var(--night)}
@media (max-width:860px){.split{grid-template-columns:1fr}.split figure{aspect-ratio:3/2}}

/* FAQ */
.faq{border-top:1px solid var(--ink)}
.faq details{border-bottom:1px solid var(--rule)}
.faq summary{cursor:pointer;list-style:none;display:grid;grid-template-columns:3em minmax(0,1fr) 1.5em;padding:20px 0;font-weight:600}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"Q";font-family:var(--f-mono);color:var(--ink-3)}
.faq summary::after{content:"+";font-family:var(--f-mono);text-align:right;color:var(--ink-3)}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:0 0 22px 3em;color:var(--ink-2);max-width:42em}

/* contact */
.contact{background:var(--sheet)}
.cgrid{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(28px,5vw,72px);align-items:start}
.cside{display:grid;gap:18px}
.cside p{color:var(--ink-2)}
.tel{font-family:var(--f-mono);font-size:1.1rem;user-select:all}
form.lf{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 18px;align-items:start}
.lf .full{grid-column:1/-1}
.lf .fld{display:flex;flex-direction:column;gap:8px;min-width:0}
.lf .fld>label{display:flex;align-items:center;gap:8px;font-size:.86rem;font-weight:600;line-height:1.4}
.lf .req{font-family:var(--f-body);font-weight:600;font-size:.66rem;line-height:1;background:var(--ink);color:#fff;padding:4px 6px}
.lf input,.lf textarea,.lf select{font:inherit;font-weight:400;font-size:.95rem;line-height:1.5;height:48px;padding:0 14px;border:1px solid var(--rule);background:var(--paper);color:var(--ink);width:100%;border-radius:0;-webkit-appearance:none;appearance:none}
.lf select{background-image:linear-gradient(45deg,transparent 50%,var(--ink) 50%),linear-gradient(135deg,var(--ink) 50%,transparent 50%);background-position:calc(100% - 20px) 21px,calc(100% - 15px) 21px;background-size:5px 5px;background-repeat:no-repeat;padding-right:40px}
.lf textarea{height:auto;min-height:150px;padding:12px 14px;resize:vertical}
.lf input:focus,.lf textarea:focus,.lf select:focus{outline:2px solid var(--ink);outline-offset:-1px;background:var(--sheet)}
.lf .agree{font-weight:400;font-size:.9rem;gap:10px}
.lf .agree input{width:18px;height:18px;padding:0;-webkit-appearance:auto;appearance:auto;accent-color:var(--ink);flex:none}
.lf .hp{position:absolute;left:-9999px;width:1px;height:1px}
.lf .err{color:#b3261e;font-size:.8rem;font-weight:500}
.lf .err:empty{display:none}
.form-msg{grid-column:1/-1;font-size:.9rem;padding:14px 16px;border:1px solid var(--rule);display:none}
.form-msg.show{display:block}
.form-msg.ok{border-color:var(--ink);background:var(--marker);color:var(--marker-ink)}
@media (max-width:860px){.cgrid{grid-template-columns:1fr}}
@media (max-width:560px){form.lf{grid-template-columns:1fr}}

/* sub page hero */
.phero{border-bottom:1px solid var(--rule);background:var(--sheet)}
.phero .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:clamp(28px,5vw,64px);align-items:center;padding-block:clamp(40px,6vw,72px)}
.crumb{font-size:.78rem;color:var(--ink-3)}
.crumb a{text-decoration:none}
.phero h1{font-size:clamp(1.9rem,3.8vw,3rem);line-height:1.4;margin-top:14px}
.phero p{margin-top:18px;color:var(--ink-2);max-width:34em}
.phero figure{margin:0;aspect-ratio:3/2;overflow:hidden;background:var(--rule)}
.phero figure img{width:100%;height:100%;object-fit:cover}
@media (max-width:860px){.phero .wrap{grid-template-columns:1fr}}

/* compare table */
.cmp{overflow-x:auto;border:1px solid var(--rule);background:var(--sheet)}
.cmp table{border-collapse:collapse;width:100%;min-width:620px;font-size:.92rem}
.cmp th,.cmp td{padding:14px 18px;border-bottom:1px solid var(--rule-soft);text-align:left;vertical-align:top}
.cmp thead th{font-family:var(--f-mono);font-weight:500;font-size:.72rem;letter-spacing:.06em;color:var(--ink-3);background:var(--paper)}
.cmp tbody th{font-weight:600;white-space:nowrap;width:10em}
.cmp td{color:var(--ink-2)}

/* prose (company / privacy) */
.prose{max-width:46em}
.prose h2{font-size:1.25rem;margin:40px 0 12px}
.prose p,.prose li{color:var(--ink-2)}
.prose p+p{margin-top:12px}
.dl{border-top:1px solid var(--ink);margin:0}
.dl div{display:grid;grid-template-columns:9em minmax(0,1fr);gap:16px;padding:16px 0;border-bottom:1px solid var(--rule)}
.dl dt{color:var(--ink-3);font-size:.9rem}
.dl dd{margin:0}

/* closing CTA */
.closing{background:var(--marker);color:var(--marker-ink);border-top:0}
.closing .wrap{display:flex;flex-wrap:wrap;gap:20px 40px;align-items:center;justify-content:space-between;padding-block:clamp(40px,6vw,64px)}
.closing h2{font-size:clamp(1.4rem,2.8vw,2.1rem);line-height:1.45}
.closing p{margin-top:8px}

/* footer */
.site-footer{background:var(--night);color:var(--night-sub);font-size:.86rem}
.site-footer .wrap{display:grid;grid-template-columns:minmax(0,1.2fr) repeat(2,minmax(0,1fr));gap:32px;padding-block:56px 28px}
.site-footer .logo{color:var(--night-ink)}
.site-footer h4{font-family:var(--f-mono);font-weight:500;font-size:.72rem;letter-spacing:.08em;color:var(--night-sub);margin-bottom:10px}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.site-footer a{text-decoration:none;color:var(--night-ink)}
.site-footer a:hover{text-decoration:underline}
.site-footer .copy{grid-column:1/-1;border-top:1px solid #33383e;padding-top:20px;font-family:var(--f-mono);font-size:.72rem}
@media (max-width:760px){.site-footer .wrap{grid-template-columns:1fr}}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .chat-q,.chat ol{transition:none}
}