/* =========================================================
   FRONTIER21 — site.css  （案A 正統エディトリアル デザインシステム）
   ネイビー＋白 / ゴシック体 / 金アクセント
   ========================================================= */
:root{
  --navy:#13294b;
  --navy-deep:#0d1d36;
  --ink:#1b2433;
  --muted:#5d6675;
  --line:#dfe3ea;
  --paper:#ffffff;
  --paper-2:#f6f7f9;
  --paper-warm:#fbf9f4;
  --gold:#a07d3d;
  --gold-soft:rgba(160,125,61,.22);
  --maxw:1180px;
  --h-font:'Zen Kaku Gothic New', sans-serif;
  --b-font:'Noto Sans JP', sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--b-font);color:var(--ink);background:var(--paper);line-height:1.9;font-size:16px;-webkit-font-smoothing:antialiased;text-wrap:pretty;}
a{color:inherit;text-decoration:none;}
img{display:block;max-width:100%;}
h1,h2,h3,h4{font-family:var(--h-font);font-weight:700;line-height:1.4;letter-spacing:.01em;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 40px;}
.wrap-narrow{max-width:880px;margin:0 auto;padding:0 40px;}
.eyebrow{font-family:var(--h-font);font-size:12px;font-weight:700;letter-spacing:.22em;color:var(--gold);text-transform:uppercase;display:inline-flex;align-items:center;gap:12px;}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--gold);display:inline-block;}
.ph{position:relative;background:repeating-linear-gradient(135deg,#eef1f5 0 10px,#e7ebf1 10px 20px);display:flex;align-items:center;justify-content:center;color:#9aa3b2;font-family:ui-monospace,'SFMono-Regular',Menlo,monospace;font-size:12px;letter-spacing:.04em;text-align:center;border:1px solid #e1e5ec;}
.ph span{background:rgba(255,255,255,.78);padding:6px 12px;border-radius:2px;}
.serif-num{font-family:'Cormorant Garamond',serif;}
.photo{background-size:cover;background-position:center;background-repeat:no-repeat;border:none;}

/* ---------- Header ---------- */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);}
.topbar{display:flex;align-items:center;justify-content:space-between;height:78px;gap:20px;}
.logo{display:flex;align-items:baseline;gap:2px;font-family:var(--h-font);font-weight:900;font-size:23px;letter-spacing:.04em;color:var(--navy);white-space:nowrap;}
.logo b{color:var(--gold);font-weight:900;}
nav.main{display:flex;gap:24px;align-items:center;flex-wrap:wrap;}
nav.main a{font-size:13.5px;font-weight:500;color:var(--ink);padding:6px 0;border-bottom:2px solid transparent;transition:.2s;white-space:nowrap;}
nav.main a:hover,nav.main a.current{color:var(--navy);border-bottom-color:var(--gold);}
.header-cta{display:flex;align-items:center;gap:18px;}
.tel{font-family:var(--h-font);font-weight:700;color:var(--navy);font-size:17px;line-height:1.1;white-space:nowrap;}
.tel small{display:block;font-size:10px;color:var(--muted);font-weight:500;letter-spacing:.08em;}
.btn{display:inline-flex;align-items:center;gap:10px;font-family:var(--h-font);font-weight:700;font-size:14px;padding:13px 22px;border-radius:2px;transition:.2s;cursor:pointer;border:1px solid transparent;letter-spacing:.03em;white-space:nowrap;}
.btn-navy{background:var(--navy);color:#fff;}
.btn-navy:hover{background:var(--navy-deep);}
.btn-ghost{background:transparent;color:var(--navy);border-color:var(--navy);}
.btn-ghost:hover{background:var(--navy);color:#fff;}
.btn-ghost-l{background:transparent;color:#fff;border-color:rgba(255,255,255,.55);}
.btn-ghost-l:hover{background:rgba(255,255,255,.12);}
.btn-gold{background:var(--gold);color:#fff;}
.btn-gold:hover{filter:brightness(.94);}
.btn-white{background:#fff;color:var(--navy);}
.btn-white:hover{background:var(--paper-2);}
.btn-lg{padding:17px 30px;font-size:15px;}

/* ---------- Home Hero ---------- */
.hero{padding:78px 0 0;}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center;}
.hero h1{font-size:43px;line-height:1.5;color:var(--navy);margin:26px 0 28px;font-weight:900;letter-spacing:.01em;}
.hero h1 .hl{background:linear-gradient(transparent 70%,var(--gold-soft) 0);}
.hero p.lead{font-size:17px;color:var(--muted);line-height:2.05;margin-bottom:36px;max-width:560px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;align-items:center;}
.hero-media{position:relative;}
.hero-media .ph{aspect-ratio:4/5;border-radius:3px;}
.hero-media .tag{position:absolute;left:-22px;bottom:34px;background:var(--navy);color:#fff;padding:18px 24px;max-width:230px;}
.hero-media .tag .n{font-family:var(--h-font);font-size:30px;font-weight:900;line-height:1;}
.hero-media .tag .t{font-size:12px;color:#c7d0e0;margin-top:6px;letter-spacing:.04em;}
.hero-foot{margin-top:54px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.trust{display:grid;grid-template-columns:repeat(4,1fr);}
.trust .it{padding:26px 28px;border-right:1px solid var(--line);}
.trust .it:last-child{border-right:none;}
.trust .it .k{font-family:var(--h-font);font-weight:900;color:var(--navy);font-size:21px;}
.trust .it .d{font-size:12.5px;color:var(--muted);margin-top:4px;letter-spacing:.02em;}

/* ---------- Inner Page Hero (navy banner) ---------- */
.page-hero{background:var(--navy);color:#fff;padding:54px 0 60px;position:relative;overflow:hidden;}
.page-hero::after{content:"";position:absolute;right:-80px;top:-80px;width:360px;height:360px;border:1px solid rgba(201,164,99,.18);border-radius:50%;pointer-events:none;z-index:1;}
.page-hero .wrap{position:relative;z-index:2;}
.hero-photo{position:absolute;inset:0;z-index:0;background-size:cover;background-position:center;opacity:.34;}
.hero-photo::after{content:"";position:absolute;inset:0;background:linear-gradient(95deg,rgba(11,25,48,.55) 0%,rgba(11,25,48,.2) 60%,rgba(11,25,48,0) 100%);}
.page-hero .eyebrow{color:#c9a463;}
.page-hero .eyebrow::before{background:#c9a463;}
.breadcrumb{font-size:12.5px;color:#9fb0cc;margin-bottom:26px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;}
.breadcrumb a:hover{color:#fff;}
.breadcrumb span{color:#6f7f9c;}
.page-hero h1{font-size:38px;color:#fff;font-weight:900;margin:16px 0 0;line-height:1.45;}
.page-hero .ph-lead{font-size:16px;color:#c4cfe0;line-height:2;margin-top:20px;max-width:760px;}

/* ---------- Section base ---------- */
section{padding:90px 0;}
section.tight{padding:64px 0;}
.alt{background:var(--paper-2);}
.sec-head{margin-bottom:48px;}
.sec-head.center{text-align:center;}
.sec-head.center p{margin-left:auto;margin-right:auto;}
.sec-head h2{font-size:32px;color:var(--navy);margin-top:16px;font-weight:900;letter-spacing:.02em;}
.sec-head p{color:var(--muted);font-size:15.5px;margin-top:14px;max-width:700px;}

/* ---------- Conclusion / AEO answer block ---------- */
.conclusion{background:var(--paper-warm);border:1px solid #ece4d2;border-left:4px solid var(--gold);padding:30px 34px;margin-bottom:40px;}
.conclusion .lab{font-family:var(--h-font);font-weight:700;font-size:13px;color:var(--gold);letter-spacing:.1em;margin-bottom:10px;}
.conclusion p{font-size:16px;color:var(--ink);line-height:2;}

/* ---------- Prose / rich content ---------- */
.prose h2{font-size:27px;color:var(--navy);margin:54px 0 20px;padding-bottom:14px;border-bottom:1px solid var(--line);position:relative;}
.prose h2:first-child{margin-top:0;}
.prose h3{font-size:20px;color:var(--navy);margin:36px 0 12px;}
.prose p{font-size:15.5px;color:var(--ink);line-height:2.05;margin-bottom:16px;}
.prose ul,.prose ol{margin:0 0 20px;padding-left:0;list-style:none;}
.prose li{font-size:15.5px;color:var(--ink);line-height:1.9;padding-left:26px;position:relative;margin-bottom:10px;}
.prose ul li::before{content:"";position:absolute;left:4px;top:13px;width:7px;height:7px;background:var(--gold);border-radius:50%;}
.prose ol{counter-reset:li;}
.prose ol li{counter-increment:li;}
.prose ol li::before{content:counter(li);position:absolute;left:0;top:1px;font-family:var(--h-font);font-weight:700;font-size:13px;color:#fff;background:var(--navy);width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;}
.prose strong{font-weight:700;color:var(--navy);}
.prose .note-inline{background:var(--paper-2);border:1px solid var(--line);padding:20px 24px;font-size:14px;color:var(--muted);line-height:1.85;margin:24px 0;}

/* ---------- Anchor nav (in-page TOC) ---------- */
.toc{border:1px solid var(--line);background:#fff;padding:26px 30px;}
.toc .lab{font-family:var(--h-font);font-weight:700;font-size:13px;color:var(--gold);letter-spacing:.1em;margin-bottom:14px;}
.toc ol{list-style:none;counter-reset:t;display:grid;grid-template-columns:1fr 1fr;gap:6px 30px;}
.toc li{counter-increment:t;font-size:14px;}
.toc li a{display:flex;gap:12px;padding:7px 0;color:var(--ink);border-bottom:1px solid transparent;transition:.2s;}
.toc li a:hover{color:var(--navy);}
.toc li a::before{content:counter(t,decimal-leading-zero);font-family:'Cormorant Garamond',serif;color:var(--gold);font-size:16px;}

/* ---------- Two-column layout (content + sidebar) ---------- */
.layout{display:grid;grid-template-columns:1fr 320px;gap:60px;align-items:start;}
.sidebar{position:sticky;top:100px;display:flex;flex-direction:column;gap:20px;}
.side-card{border:1px solid var(--line);padding:26px;}
.side-card.navy{background:var(--navy);color:#fff;border-color:var(--navy);}
.side-card.navy h4{color:#fff;}
.side-card.navy p{color:#b6c1d4;}
.side-card h4{font-size:17px;color:var(--navy);margin-bottom:12px;}
.side-card p{font-size:13.5px;color:var(--muted);line-height:1.8;margin-bottom:16px;}
.side-card .tel-lg{font-family:var(--h-font);font-weight:900;font-size:24px;color:#fff;}
.side-card .tel-lg small{display:block;font-size:11px;color:#a9b4c8;font-weight:500;margin-bottom:2px;}
.side-links a{display:block;font-size:14px;padding:11px 0;border-bottom:1px solid var(--line);color:var(--ink);transition:.2s;}
.side-links a:last-child{border-bottom:none;}
.side-links a:hover{color:var(--gold);padding-left:6px;}
.side-links a::before{content:"›";color:var(--gold);margin-right:10px;font-weight:700;}

/* ---------- Worries ---------- */
.worry-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
.worry-grid .c{background:#fff;padding:34px 30px;}
.worry-grid .c .no{font-family:'Cormorant Garamond',serif;font-size:30px;color:var(--gold);font-weight:600;line-height:1;}
.worry-grid .c p{font-size:15.5px;margin-top:14px;color:var(--ink);line-height:1.85;}

/* ---------- Services ---------- */
.svc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.svc-grid.cols-3{grid-template-columns:repeat(3,1fr);}
.svc{display:flex;flex-direction:column;border:1px solid var(--line);padding:38px 36px;transition:.25s;background:#fff;}
.svc:hover{border-color:var(--navy);box-shadow:0 18px 40px -28px rgba(19,41,75,.4);transform:translateY(-3px);}
.svc .lab{font-family:'Cormorant Garamond',serif;font-size:15px;letter-spacing:.18em;color:var(--gold);text-transform:uppercase;}
.svc h3{font-size:22px;color:var(--navy);margin:10px 0 14px;}
.svc p{color:var(--muted);font-size:14.5px;line-height:1.9;flex:1;}
.svc .go{margin-top:22px;font-family:var(--h-font);font-weight:700;font-size:14px;color:var(--navy);display:inline-flex;align-items:center;gap:8px;}
.svc .go::after{content:"→";transition:.2s;}
.svc:hover .go::after{transform:translateX(5px);}

/* ---------- Strengths ---------- */
.strength{background:var(--navy);color:#fff;}
.strength .sec-head h2{color:#fff;}
.strength .sec-head p{color:#aeb9cc;}
.strength .eyebrow{color:#c9a463;}
.strength .eyebrow::before{background:#c9a463;}
.str-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:46px 56px;}
.str .num{font-family:'Cormorant Garamond',serif;font-size:22px;color:#c9a463;border-bottom:1px solid rgba(201,164,99,.45);padding-bottom:12px;display:block;}
.str h3{font-size:21px;margin:18px 0 12px;color:#fff;}
.str p{color:#b4bfd2;font-size:15px;line-height:1.9;}

/* ---------- Process flow ---------- */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:2px solid var(--navy);}
.flow .st{padding:28px 22px 30px;border-right:1px solid var(--line);position:relative;}
.flow .st:last-child{border-right:none;}
.flow .st .n{font-family:'Cormorant Garamond',serif;font-size:20px;color:var(--gold);}
.flow .st h4{font-size:16.5px;color:var(--navy);margin:8px 0 8px;}
.flow .st p{font-size:13px;color:var(--muted);line-height:1.75;}
/* vertical steps */
.steps{display:flex;flex-direction:column;}
.steps .step{display:grid;grid-template-columns:88px 1fr;gap:26px;padding:28px 0;border-bottom:1px solid var(--line);}
.steps .step:last-child{border-bottom:none;}
.steps .step .n{font-family:'Cormorant Garamond',serif;font-size:40px;color:var(--gold);font-weight:600;line-height:1;border-right:2px solid var(--navy);}
.steps .step h3{font-size:20px;color:var(--navy);margin-bottom:8px;}
.steps .step p{font-size:14.5px;color:var(--muted);line-height:1.9;}

/* ---------- Comparison table ---------- */
.tbl{width:100%;border-collapse:collapse;border:1px solid var(--line);font-size:14.5px;}
.tbl th,.tbl td{padding:18px 22px;text-align:left;border:1px solid var(--line);vertical-align:top;line-height:1.8;}
.tbl thead th{background:var(--navy);color:#fff;font-family:var(--h-font);font-weight:700;font-size:14px;}
.tbl tbody th{background:var(--paper-2);color:var(--navy);font-family:var(--h-font);font-weight:700;width:170px;}
.tbl td{color:var(--ink);}
.tbl tr:nth-child(even) td{background:#fcfcfd;}

/* ---------- Options compare cards ---------- */
.opt-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.opt{border:1px solid var(--line);padding:32px 30px;background:#fff;}
.opt h3{font-size:20px;color:var(--navy);padding-bottom:14px;border-bottom:2px solid var(--gold);display:inline-block;margin-bottom:18px;}
.opt p{font-size:14.5px;color:var(--muted);line-height:1.9;}

/* ---------- Cases ---------- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.case{border:1px solid var(--line);background:#fff;display:flex;flex-direction:column;transition:.2s;}
.case:hover{box-shadow:0 18px 40px -30px rgba(19,41,75,.4);}
.case .ph{aspect-ratio:16/10;}
.case .bd{padding:26px 26px 30px;flex:1;display:flex;flex-direction:column;}
.case .meta{font-size:12px;color:var(--gold);font-family:var(--h-font);font-weight:700;letter-spacing:.1em;}
.case h3{font-size:18px;color:var(--navy);margin:10px 0 10px;line-height:1.6;}
.case p{font-size:14px;color:var(--muted);line-height:1.85;flex:1;}
.case .go{margin-top:16px;font-size:13px;font-family:var(--h-font);font-weight:700;color:var(--navy);}
.case .go::after{content:" →";}

/* ---------- Message ---------- */
.msg-grid{display:grid;grid-template-columns:300px 1fr;gap:56px;align-items:start;}
.msg-photo{border:1px solid var(--line);background:#fff;padding:18px;}
.msg-photo img{width:100%;filter:saturate(.92);}
.msg-photo .cap{margin-top:14px;text-align:center;font-family:var(--h-font);}
.msg-photo .cap b{display:block;font-size:18px;color:var(--navy);}
.msg-photo .cap small{font-size:12px;color:var(--muted);}
.msg-body h2{font-size:28px;color:var(--navy);line-height:1.6;margin-bottom:22px;font-weight:900;}
.msg-body p{color:var(--ink);font-size:15.5px;line-height:2.05;margin-bottom:16px;}
.msg-body p.sign{font-family:var(--h-font);font-weight:700;color:var(--navy);margin-top:24px;}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line);}
.faq details{border-bottom:1px solid var(--line);}
.faq summary{list-style:none;cursor:pointer;padding:24px 50px 24px 44px;position:relative;font-family:var(--h-font);font-weight:700;font-size:17px;color:var(--navy);line-height:1.6;}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::before{content:"Q";position:absolute;left:0;top:24px;font-family:'Cormorant Garamond',serif;font-size:22px;color:var(--gold);font-weight:600;}
.faq summary::after{content:"+";position:absolute;right:8px;top:22px;font-size:24px;color:var(--gold);font-weight:300;transition:.2s;}
.faq details[open] summary::after{transform:rotate(45deg);}
.faq .ans{padding:0 50px 26px 44px;font-size:15px;color:var(--muted);line-height:2;}

/* ---------- Contact form ---------- */
.form{display:grid;gap:22px;}
.form .row{display:grid;gap:8px;}
.form label{font-family:var(--h-font);font-weight:700;font-size:14px;color:var(--navy);display:flex;align-items:center;gap:10px;}
.form label .req{font-size:11px;background:var(--gold);color:#fff;padding:2px 8px;border-radius:2px;font-weight:700;}
.form label .opt{font-size:11px;background:var(--paper-2);color:var(--muted);padding:2px 8px;border-radius:2px;border:1px solid var(--line);}
.form input,.form textarea,.form select{font-family:var(--b-font);font-size:15px;padding:14px 16px;border:1px solid var(--line);border-radius:2px;background:#fff;color:var(--ink);width:100%;transition:.2s;}
.form input:focus,.form textarea:focus,.form select:focus{outline:none;border-color:var(--navy);box-shadow:0 0 0 3px rgba(19,41,75,.08);}
.form .two{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.form .submit{margin-top:6px;}
.consent{font-size:13px;color:var(--muted);display:flex;gap:10px;align-items:flex-start;line-height:1.7;}
.consent input{width:auto;margin-top:5px;}

/* ---------- CTA band ---------- */
.cta{background:var(--navy);color:#fff;text-align:center;}
.cta h2{font-size:32px;margin-bottom:18px;font-weight:900;color:#fff;}
.cta p{color:#b6c1d4;font-size:16px;margin-bottom:34px;}
.cta-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;align-items:center;}
.cta .tel-lg{font-family:var(--h-font);font-weight:900;font-size:30px;color:#fff;letter-spacing:.04em;}
.cta .tel-lg small{display:block;font-size:12px;color:#a9b4c8;font-weight:500;letter-spacing:.12em;margin-bottom:2px;}
.cta .eyebrow{color:#c9a463;justify-content:center;display:flex;}

/* ---------- Related links ---------- */
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.related{border:1px solid var(--line);padding:26px 28px;transition:.2s;background:#fff;display:block;}
.related:hover{border-color:var(--navy);transform:translateY(-2px);}
.related .k{font-family:var(--h-font);font-weight:700;font-size:17px;color:var(--navy);margin-bottom:8px;}
.related .d{font-size:13px;color:var(--muted);line-height:1.75;}
.related .go{margin-top:14px;font-size:13px;font-family:var(--h-font);font-weight:700;color:var(--gold);}
.related .go::after{content:" →";}

/* ---------- Disclaimer ---------- */
.disc{background:var(--paper-warm);border-top:1px solid var(--line);}
.disc .wrap{padding-top:26px;padding-bottom:26px;}
.disc p{font-size:12.5px;color:#8a7a55;line-height:1.85;}

/* ---------- Footer ---------- */
footer.site{background:var(--navy-deep);color:#aab4c6;padding:64px 0 30px;font-size:13.5px;}
.foot-top{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1);}
.foot-logo{font-family:var(--h-font);font-weight:900;font-size:22px;color:#fff;letter-spacing:.04em;margin-bottom:18px;}
.foot-logo b{color:#c9a463;}
.foot-top p{line-height:1.95;}
.foot-col h4{font-family:var(--h-font);color:#fff;font-size:14px;margin-bottom:16px;letter-spacing:.06em;}
.foot-col a{display:block;padding:5px 0;color:#aab4c6;transition:.2s;}
.foot-col a:hover{color:#fff;}
.foot-note{padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:12px;color:#7e8aa0;line-height:1.8;}

@media(max-width:980px){
  nav.main,.header-cta .tel{display:none;}
  .hero-grid{grid-template-columns:1fr;gap:40px;}
  .trust{grid-template-columns:repeat(2,1fr);}
  .trust .it:nth-child(2){border-right:none;}
  .worry-grid,.svc-grid,.svc-grid.cols-3,.str-grid,.flow,.opt-grid,.case-grid,.related-grid{grid-template-columns:1fr;}
  .flow .st{border-right:none;border-bottom:1px solid var(--line);}
  .msg-grid,.layout{grid-template-columns:1fr;}
  .sidebar{position:static;}
  .toc ol{grid-template-columns:1fr;}
  .form .two{grid-template-columns:1fr;}
  .foot-top{grid-template-columns:1fr;}
  .hero h1{font-size:32px;}
  .page-hero h1{font-size:29px;}
  .steps .step{grid-template-columns:60px 1fr;gap:16px;}
}