/*
Theme Name: GOLDBACH 2026
Theme URI: https://yiwutaorui.com/
Author: GOLDBACH CO., LTD.
Description: ゴールドバッハ株式会社 コーポレートサイト用テーマ（2026年ブランド刷新版）
Version: 1.5.0
Requires at least: 6.0
Requires PHP: 7.4
Text Domain: goldbach2026
*/

:root{
  --red:#C8102E; --red-deep:#A31621; --tint:#FBEDEF;
  --ink:#1F2328; --mut:#6E7276; --line:#E3E0DD; --paper:#FBFAF9; --dark:#121417;
  --maxw:1120px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",sans-serif;
  color:var(--ink); background:#fff; line-height:1.85; font-size:15px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.93);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.hd{display:flex;align-items:center;justify-content:space-between;height:68px}
.gnav ul{display:flex;gap:26px;list-style:none;font-size:13.5px;font-weight:600}
.gnav a{text-decoration:none}
.gnav a:hover{color:var(--red)}
.btn{display:inline-block;padding:10px 20px;border-radius:2px;font-size:13.5px;font-weight:700;text-decoration:none}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:var(--red-deep)}
.btn-line{border:1px solid #fff;color:#fff}
.menu-btn{display:none;background:none;border:0;font-size:22px;cursor:pointer;line-height:1}
.gnav.open{display:block;position:absolute;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:16px 24px}
.gnav.open ul{flex-direction:column;gap:14px}

/* hero */
.hero{position:relative;min-height:560px;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:var(--hero-img) center/cover}
.hero .wrap{position:relative;z-index:2;padding:72px 24px}
.hero .kicker{font-size:12px;letter-spacing:.22em;font-weight:700;margin-bottom:22px;opacity:.9}
.hero h1{font-size:clamp(28px,4.4vw,46px);line-height:1.5;font-weight:800}
.hero p{margin-top:24px;font-size:16px;max-width:620px;opacity:.94}
.hero .cta{margin-top:36px;display:flex;gap:14px;flex-wrap:wrap}

/* section */
.sec{padding:84px 0}
.sec-head{margin-bottom:44px}
.sec-head .en{font-size:12px;letter-spacing:.2em;font-weight:700;color:var(--red);margin-bottom:10px}
.sec-head h2{font-size:clamp(23px,3vw,31px);font-weight:800;line-height:1.5}
.sec-head .lead{margin-top:16px;color:var(--mut);max-width:680px}
.bg-paper{background:var(--paper)}

.flows{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.flow{border:1px solid var(--line);background:#fff}
.flow .ph{aspect-ratio:16/9;overflow:hidden}
.flow .ph img{width:100%;height:100%;object-fit:cover}
.flow .bd{padding:28px}
.flow h3{font-size:19px;font-weight:800;margin-bottom:6px}
.flow .sub{font-size:12px;letter-spacing:.14em;color:var(--red);font-weight:700;margin-bottom:14px}
.flow p{color:var(--mut);font-size:14px}
.flow ul{margin-top:18px;list-style:none;font-size:13.5px}
.flow li{padding:7px 0 7px 20px;position:relative;border-top:1px solid var(--line)}
.flow li::before{content:"";position:absolute;left:0;top:16px;width:7px;height:7px;background:var(--red)}

.nums{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.num{background:#fff;padding:30px 20px;text-align:center}
.num .v{font-size:30px;font-weight:800;color:var(--red);line-height:1.2}
.num .l{font-size:12px;color:var(--mut);margin-top:8px}

.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step{background:#fff;border:1px solid var(--line);padding:26px 22px}
.step .n{width:34px;height:34px;border-radius:50%;background:var(--red);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;margin-bottom:16px}
.step h4{font-size:16px;font-weight:800;margin-bottom:8px}
.step p{font-size:13.5px;color:var(--mut)}

.gal{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gal figure{margin:0}
.gal img{aspect-ratio:16/9;object-fit:cover;width:100%}
.gal figcaption{font-size:12px;color:var(--mut);margin-top:8px}

.grp{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gcard{border:1px solid var(--line);padding:22px;background:#fff}
.gcard .nm{font-weight:700;font-size:14.5px;line-height:1.6}
.gcard .lo{font-size:12px;color:var(--red);margin-top:10px}
.gcard .ro{font-size:12.5px;color:var(--mut)}
.note{font-size:12px;color:var(--mut);margin-top:18px}

.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th,.tbl td{text-align:left;padding:15px 0;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{width:180px;font-weight:700;color:var(--red);font-size:13px}

/* news & blog cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{display:block;background:#fff;border:1px solid var(--line);padding:22px;text-decoration:none;color:inherit;transition:.15s}
.card:hover{border-color:var(--red);transform:translateY(-2px)}
.card .d{font-size:11.5px;color:var(--red);font-weight:700;letter-spacing:.06em}
.card .t{font-size:15px;font-weight:700;margin:10px 0 8px;line-height:1.6}
.card .x{font-size:12.5px;color:var(--mut);line-height:1.75}
.more{margin-top:28px;text-align:center}
.more a{display:inline-block;padding:12px 28px;border:1px solid var(--ink);text-decoration:none;font-size:13.5px;font-weight:700}
.more a:hover{background:var(--ink);color:#fff}
.empty{color:var(--mut);font-size:14px;padding:28px;border:1px dashed var(--line);text-align:center}

/* sns embeds */
.sns-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}
.sns-box{border:1px solid var(--line);background:#fff;padding:18px;min-height:420px;overflow:hidden}
.sns-box h3{font-size:14px;font-weight:700;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.sns-box .fallback{color:var(--mut);font-size:13px;padding:24px 0}

/* article */
.entry{padding:72px 0}
.entry h1{font-size:clamp(23px,3.2vw,32px);font-weight:800;line-height:1.55;margin-bottom:14px}
.entry .meta{font-size:12.5px;color:var(--red);font-weight:700;margin-bottom:34px}
.entry-body{font-size:15px}
.entry-body p{margin:0 0 1.5em}
.entry-body h2{font-size:21px;font-weight:800;margin:2.2em 0 .8em;padding-bottom:.4em;border-bottom:1px solid var(--line)}
.entry-body h3{font-size:17px;font-weight:800;margin:1.8em 0 .6em}
.entry-body ul,.entry-body ol{margin:0 0 1.5em 1.4em}
.entry-body li{margin-bottom:.5em}
.entry-body img{margin:1.5em 0}
.entry-body table{width:100%;border-collapse:collapse;margin:1.5em 0;font-size:14px}
.entry-body th,.entry-body td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.entry-body th{background:var(--paper);font-weight:700}
.entry-body blockquote{border-left:3px solid var(--red);padding:.4em 0 .4em 1.2em;margin:1.5em 0;color:var(--mut)}

.pager{display:flex;justify-content:space-between;gap:16px;margin-top:48px;padding-top:28px;border-top:1px solid var(--line);font-size:13.5px}
.pager a{text-decoration:none;font-weight:700}
.pager a:hover{color:var(--red)}

/* contact */
.contact{background:var(--dark);color:#fff}
.contact .sec-head h2{color:#fff}
.contact .sec-head .en{color:#fff;opacity:.75}
.cgrid{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:start}
.cinfo dt{font-size:12px;opacity:.6;margin-top:18px}
.cinfo dd{font-size:15px;margin-top:4px}
.cinfo dd a{color:#fff}

/* footer */
.site-footer{background:#0C0E10;color:#fff;padding:52px 0 30px;font-size:13px}
.fgrid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:30px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.14)}
.site-footer .flogo{height:38px;margin-bottom:16px}
.site-footer h5{font-size:12px;letter-spacing:.12em;opacity:.55;margin-bottom:14px}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:9px}
.site-footer a{text-decoration:none;opacity:.85}
.site-footer a:hover{opacity:1;text-decoration:underline}
.copy{padding-top:22px;font-size:11.5px;opacity:.5;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

@media(max-width:900px){
  .flows,.cgrid,.fgrid,.sns-grid{grid-template-columns:1fr}
  .nums{grid-template-columns:1fr 1fr}
  .steps,.gal,.grp,.cards{grid-template-columns:1fr 1fr}
  .gnav{display:none}
  .menu-btn{display:block}
  .sec{padding:60px 0}
  .tbl th{width:120px}
}
@media(max-width:560px){
  .steps,.gal,.grp,.cards,.nums{grid-template-columns:1fr}
}

/* FAQ */
.faq{max-width:840px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{list-style:none;cursor:pointer;padding:20px 40px 20px 0;font-weight:700;font-size:15.5px;line-height:1.7;position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"";position:absolute;right:8px;top:50%;width:9px;height:9px;border-right:2px solid var(--red);border-bottom:2px solid var(--red);transform:translateY(-70%) rotate(45deg);transition:.2s}
.faq-item[open] summary::after{transform:translateY(-30%) rotate(225deg)}
.faq-item summary:hover{color:var(--red)}
.faq-a{padding:0 0 22px;color:var(--mut);font-size:14.5px;line-height:1.95}

/* ブランド（GOLDBACH ＋ サービス） */
.brand{display:flex;align-items:center;gap:18px}
.hd .logo img{height:30px;width:auto;display:block}
.brand-svc{display:flex;align-items:center;gap:7px;padding-left:18px;border-left:1px solid var(--line);text-decoration:none;opacity:.82;transition:.15s}
.brand-svc:hover{opacity:1}
.brand-svc img{height:19px;width:auto;display:block}
.brand-svc-l{font-size:8.5px;font-weight:700;letter-spacing:.14em;color:var(--mut);line-height:1}
@media(max-width:820px){.brand-svc{display:none}}

/* 認証・法対応 */
.cert{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.cert-item{background:#fff;padding:24px 22px}
.cert-n{font-size:20px;font-weight:800;color:var(--red);line-height:1.2}
.cert-t{font-size:12.5px;font-weight:700;margin:6px 0 12px;letter-spacing:.02em}
.cert-item p{font-size:13px;color:var(--mut);line-height:1.85;margin:0}
.cert-note{margin-top:30px;max-width:840px}
.cert-note p{font-size:14px;color:var(--mut);line-height:1.95;margin:0 0 1em}
.cert-note strong{color:var(--ink)}
.cert-line{border-left:3px solid var(--red);padding-left:16px;margin-top:22px !important}
@media(max-width:900px){.cert{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.cert{grid-template-columns:1fr}}

.cert-free{background:var(--tint);border-left:3px solid var(--red);padding:18px 22px;margin-top:6px !important;color:var(--ink) !important;font-size:14px !important;line-height:1.9 !important}

/* SNS ― リンクカード（Xは外部タイムライン埋め込みを廃止したため）*/
.sns-card{display:flex;flex-direction:column;justify-content:center;min-height:360px;border:1px solid var(--line);background:var(--paper);padding:30px 26px}
.sns-card-t{font-size:14.5px;font-weight:700;line-height:1.85;margin:0 0 10px;color:var(--ink)}
.sns-card-s{font-size:12.5px;color:var(--mut);line-height:1.8;margin:0 0 22px}
.sns-card .btn{align-self:flex-start}

/* お問い合わせフォーム */
.gbform{max-width:720px;margin:0 0 10px}
.gbform-lead{font-size:14.5px;color:var(--mut);line-height:1.9;margin:0 0 30px}
.gbform-row{display:flex;flex-wrap:wrap;gap:6px 0;padding:18px 0;border-bottom:1px solid var(--line)}
.gbform-label{flex:0 0 190px;font-size:13.5px;font-weight:700;padding-top:9px}
.gbform-field{flex:1 1 320px;min-width:0}
.gbform-label .req{display:inline-block;margin-left:8px;padding:2px 7px;background:var(--red);color:#fff;font-size:10px;font-weight:700;border-radius:2px;vertical-align:1px}
.gbform input[type=text],.gbform input[type=email],.gbform textarea,.gbform select{width:100%;max-width:100%;box-sizing:border-box;font:inherit;font-size:15px;padding:11px 13px;border:1px solid var(--line);background:#fff;border-radius:2px;color:var(--ink)}
.gbform textarea{line-height:1.8;resize:vertical}
.gbform input:focus,.gbform textarea:focus,.gbform select:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px var(--tint)}
.gbform input::placeholder,.gbform textarea::placeholder{color:#b3b5ba}
.gbform-agree{border-bottom:none;padding-top:24px}
.gbform-agree .gbform-field{flex:1 1 100%}
.gbform-agree label{display:inline-flex;align-items:center;gap:9px;font-size:14.5px;font-weight:700;cursor:pointer}
.gbform-agree input[type=checkbox]{width:17px;height:17px;accent-color:var(--red);flex:none}
.gbform-note{font-size:12.5px;color:var(--mut);line-height:1.8;margin:10px 0 0}
.gbform-submit{margin-top:26px;display:flex;gap:12px;flex-wrap:wrap}
.gbform-submit input[type=submit],.gbform-submit button{font:inherit;font-size:15px;font-weight:700;padding:14px 34px;border:none;border-radius:2px;background:var(--red);color:#fff;cursor:pointer;transition:.15s}
.gbform-submit input[type=submit]:hover{opacity:.87}
.gbform-submit input[name='submitBack']{background:#fff;color:var(--ink);border:1px solid var(--line)}
.mw_wp_form .error{display:block;color:var(--red);font-size:12.5px;font-weight:700;margin-top:7px}
.gbform-done{border:1px solid var(--line);background:var(--paper);padding:36px 34px;max-width:720px}
.gbform-done-t{font-size:19px;font-weight:800;color:var(--red);margin:0 0 14px}
.gbform-done p{font-size:14.5px;line-height:1.95;margin:0 0 .9em;color:var(--ink)}
@media(max-width:700px){.gbform-label{flex:1 1 100%;padding-top:0}}