/* 株式会社勝又熔接工業所 サイト共通スタイル（案B） */
:root{
  --ink:#111418; --ink2:#3a4048; --mute:#7a828c; --line:#e3e6ea;
  --acc:#1f5fa8; --acc-dark:#174a84; --acc2:#ff8a00;
  --bg:#fff; --bg-soft:#f4f6f8; --dark:#0f1419; --dark2:#2a323c;
  --max:1180px; --prose:900px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Noto Sans JP","Hiragino Sans","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;color:var(--ink);background:var(--bg);line-height:1.9;font-size:16px;letter-spacing:.02em}
img{max-width:100%;height:auto;display:block}
a{color:var(--acc)}
a:hover{color:var(--acc-dark)}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .6em;font-weight:700;letter-spacing:.03em}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.4em}
table{border-collapse:collapse;width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.prose{max-width:var(--prose)}
.en{font-family:Oswald,"Noto Sans JP",sans-serif;letter-spacing:.12em;text-transform:uppercase}
.kicker{display:inline-block;color:var(--acc);font-weight:700;font-size:13px;letter-spacing:.3em;margin-bottom:10px;font-family:Oswald,sans-serif}
.kicker::before{content:"";display:inline-block;width:28px;height:2px;background:var(--acc);vertical-align:middle;margin-right:10px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ===== ヘッダー ===== */
.hd{position:fixed;inset:0 0 auto 0;z-index:50;transition:background .3s,box-shadow .3s,color .3s;color:var(--ink);background:#fff;box-shadow:0 1px 0 var(--line)}
.hd .wrap{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:16px}
.hd .logo{font-weight:900;font-size:17px;letter-spacing:.08em;color:inherit;text-decoration:none;line-height:1.2;display:flex;align-items:center;gap:12px}
.hd .logo small{display:block;font-size:9px;font-weight:500;letter-spacing:.22em;opacity:.75;font-family:Oswald,sans-serif}
.hd .logo .mark{width:44px;height:44px;flex:none}
.hd .logo .mark-w{display:none}
body.home .hd:not(.solid) .logo .mark-b{display:none}
body.home .hd:not(.solid) .logo .mark-w{display:block}
.hd.menu-open .logo .mark-b{display:none}
.hd.menu-open .logo .mark-w{display:block}
.ft-logo{width:260px;height:auto;margin-bottom:14px;background:#fff;padding:10px 16px;border-radius:4px;box-sizing:content-box}
.hd nav{margin-left:auto}
.hd nav ul{list-style:none;margin:0;padding:0;display:flex;gap:2px}
.hd nav a{display:block;padding:8px 14px;font-size:14px;font-weight:500;letter-spacing:.1em;color:inherit;text-decoration:none;border-bottom:2px solid transparent}
.hd nav a:hover,.hd nav a[aria-current="page"]{border-bottom-color:var(--acc2)}
.hd .tel{font-family:Oswald,sans-serif;font-size:19px;letter-spacing:.06em;color:inherit;text-decoration:none;margin-left:22px;padding-left:24px;border-left:1px solid rgba(128,136,144,.45);line-height:1}
.hd .tel small{display:block;font-family:"Noto Sans JP",sans-serif;font-size:10px;letter-spacing:.2em;opacity:.75;margin-bottom:3px}
.nav-toggle{display:none;background:none;border:1px solid currentColor;color:inherit;border-radius:4px;padding:7px 12px;font-size:12px;letter-spacing:.2em;cursor:pointer;font-family:Oswald,sans-serif}
body.home .hd:not(.solid){background:transparent;box-shadow:none;color:#fff}
.hd-space{height:72px}
body.home .hd-space{display:none}
@media (max-width:900px){
  .hd .tel{display:none}
  .nav-toggle{display:block}
  .hd nav{display:none;position:fixed;inset:72px 0 0 0;background:var(--dark);color:#fff;padding:20px 24px;overflow:auto}
  .hd nav.open{display:block}
  .hd nav ul{flex-direction:column;gap:0}
  .hd nav a{font-size:18px;padding:16px 4px;border-bottom:1px solid var(--dark2)}
  .hd nav a small{color:var(--acc2);font-family:Oswald,sans-serif;font-size:11px;margin-left:12px;letter-spacing:.2em}
  .hd.menu-open{background:var(--dark);color:#fff;box-shadow:none}
}
@media (min-width:901px){.hd nav a small{display:none}}
@media (max-width:420px){.hd .logo{font-size:14px;letter-spacing:.04em;gap:8px}.hd .logo .mark{width:36px;height:36px}}

/* ===== ヒーロー（トップ） ===== */
.hero{position:relative;min-height:100svh;display:grid;align-items:end;color:#fff;overflow:hidden;background:var(--dark)}
.hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.75;animation:kb 22s ease-in-out infinite alternate}
@keyframes kb{from{transform:scale(1)}to{transform:scale(1.08)}}
@media (prefers-reduced-motion:reduce){.hero img{animation:none}}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.35) 0%,rgba(0,0,0,0) 35%,rgba(10,14,20,.88) 100%)}
.hero .in{position:relative;z-index:2;padding:120px 24px 70px}
.hero .en{font-size:clamp(12px,1.4vw,14px);opacity:.85;margin-bottom:14px}
.hero h1{font-size:clamp(26px,6vw,76px);font-weight:900;line-height:1.15;margin:0 0 22px;letter-spacing:.02em}
.hero h1 span{color:var(--acc2)}
.hero p{max-width:560px;font-size:clamp(14px,1.3vw,17px);opacity:.92}
.hero .cta{display:inline-flex;gap:12px;align-items:center;margin-top:18px;padding:14px 26px;border:1px solid #fff;border-radius:999px;font-weight:700;font-size:14px;letter-spacing:.1em;color:#fff;text-decoration:none;transition:.25s}
.hero .cta:hover{background:#fff;color:var(--ink)}
.hero .scroll{position:absolute;right:28px;bottom:28px;z-index:2;font-size:11px;letter-spacing:.3em;writing-mode:vertical-rl;opacity:.8}

/* ===== 数字の帯 ===== */
.stats{background:var(--dark);color:#fff}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);border-left:1px solid var(--dark2)}
.stats div{padding:34px 24px;border-right:1px solid var(--dark2)}
.stats b{display:block;font-family:Oswald,sans-serif;font-size:clamp(34px,4vw,54px);font-weight:700;line-height:1;color:#fff}
.stats b small{font-size:.4em;margin-left:4px;color:var(--acc2)}
.stats b > span{font-size:inherit;color:inherit;letter-spacing:inherit}
.stats div > span{font-size:13px;color:#aab3bd;letter-spacing:.1em}
@media (max-width:800px){.stats .wrap{grid-template-columns:1fr 1fr}.stats div{border-bottom:1px solid var(--dark2)}}

/* ===== 区画 ===== */
.sec{padding:96px 0}
.sec.alt{background:var(--bg-soft)}
.sec.dark{background:var(--dark);color:#fff}
.sec.dark .kicker{color:var(--acc2)}.sec.dark .kicker::before{background:var(--acc2)}
.sec.dark p{color:#d6dbe1}
.sec h2{font-size:clamp(26px,3.4vw,40px);font-weight:900;line-height:1.3;margin:0 0 22px}
.sec h3{font-size:20px;margin-top:40px;padding-left:14px;border-left:4px solid var(--acc)}
.sec h3:first-child{margin-top:0}
.sec.dark h3{border-left-color:var(--acc2)}
.sec .lead{font-size:clamp(17px,1.6vw,20px);font-weight:700;color:var(--acc-dark);line-height:1.6}
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.split .pic{position:relative}
.split .pic img{border-radius:4px}
.split .pic[data-since]::before{content:attr(data-since);position:absolute;left:-18px;top:-24px;font-family:Oswald,sans-serif;font-size:clamp(50px,7vw,96px);font-weight:700;color:transparent;-webkit-text-stroke:1px #c9ced4;line-height:1;z-index:1;letter-spacing:.05em}
@media (max-width:800px){.split{grid-template-columns:1fr;gap:36px}}
.more{display:inline-flex;align-items:center;gap:14px;font-weight:700;font-size:14px;letter-spacing:.14em;margin-top:10px;color:var(--ink);text-decoration:none}
.more i{width:44px;height:44px;border:1px solid var(--ink);border-radius:50%;display:grid;place-items:center;font-style:normal;transition:.25s}
.more:hover i{background:var(--ink);color:#fff}
.sec.dark .more{color:#fff}.sec.dark .more i{border-color:#fff}.sec.dark .more:hover i{background:#fff;color:var(--ink)}
.btn{display:inline-block;padding:14px 34px;background:var(--acc2);color:#111;font-weight:700;border-radius:999px;font-size:14px;letter-spacing:.1em;text-decoration:none;transition:.25s}
.btn:hover{filter:brightness(1.1);color:#111}
.btn.blue{background:var(--acc);color:#fff}
.btn.blue:hover{background:var(--acc-dark);color:#fff}

/* ===== ページ見出し帯（下層） ===== */
.page-head{position:relative;background:var(--dark);color:#fff;padding:110px 0 60px;overflow:hidden}
.page-head img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.35}
.page-head::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(15,20,25,.9),rgba(15,20,25,.4))}
.page-head .wrap{position:relative;z-index:1}
.page-head .en{display:block;font-size:13px;color:var(--acc2);margin-bottom:8px}
.page-head h1{margin:0;font-size:clamp(28px,4.4vw,52px);font-weight:900;letter-spacing:.04em}
.breadcrumb{font-size:12px;color:var(--mute);padding:12px 0;border-bottom:1px solid var(--line);letter-spacing:.06em}
.breadcrumb ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.breadcrumb li+li::before{content:"/";margin-right:6px;color:#c3c9d0}
.breadcrumb a{text-decoration:none;color:var(--ink2)}
.subnav{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:28px 0 0}
.subnav a{display:block;padding:8px 18px;border:1px solid var(--line);border-radius:999px;font-size:13px;font-weight:500;letter-spacing:.08em;color:var(--ink);text-decoration:none}
.subnav a:hover,.subnav a[aria-current="page"]{background:var(--ink);color:#fff;border-color:var(--ink)}

/* ===== 表 ===== */
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:16px 14px;text-align:left;vertical-align:top}
.tbl th{width:26%;font-weight:700;color:var(--ink2);font-size:14px;letter-spacing:.06em}
.tbl tr:first-child th,.tbl tr:first-child td{border-top:2px solid var(--ink)}
@media (max-width:600px){.tbl th,.tbl td{display:block;width:auto}.tbl th{border-bottom:none;padding-bottom:0}.tbl td{padding-top:4px}}
.tbl-history th{width:9em;white-space:nowrap;font-family:Oswald,"Noto Sans JP",sans-serif;font-size:16px;color:var(--acc);letter-spacing:.04em}
.tbl-spec th{width:40%}
.cols-2{columns:2;column-gap:32px}
@media (max-width:600px){.cols-2{columns:1}}

/* ===== カード ===== */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px;list-style:none;padding:0;margin:40px 0 0}
.card{background:#fff;overflow:hidden;border-radius:4px;transition:.3s;box-shadow:0 1px 0 var(--line);display:block;text-decoration:none;color:inherit}
.card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(0,0,0,.12);color:inherit}
.card img{aspect-ratio:4/3;object-fit:cover;width:100%;transition:.6s}
.card:hover img{transform:scale(1.05)}
.card .b{padding:22px 24px 26px}
.card .num{font-family:Oswald,sans-serif;color:var(--acc);font-size:13px;letter-spacing:.2em}
.card h3{margin:6px 0 8px;font-size:20px;border:none;padding:0}
.card p{font-size:14px;color:var(--ink2);margin:0}
.features{list-style:none;padding:0;margin:24px 0 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.features li{border:1px solid var(--line);padding:18px 20px;border-radius:4px;background:#fff;font-size:14px;color:var(--ink2)}
.features li b{display:block;color:var(--acc);font-size:16px;margin-bottom:4px}
.sec.dark .features li{border-color:rgba(255,255,255,.2);background:rgba(255,255,255,.04);color:#d6dbe1}
.sec.dark .features li b{color:var(--acc2)}
.feat-split{display:grid;grid-template-columns:1.15fr .85fr;gap:20px;align-items:stretch;margin-top:24px}
.feat-split .features{grid-template-columns:1fr 1fr;margin:0}
.feat-split .figure{margin:0;display:flex;flex-direction:column}
.feat-split .figure img{flex:1;object-fit:contain;background:#fff;width:100%;height:100%}
@media (max-width:800px){.feat-split{grid-template-columns:1fr}}
@media (max-width:480px){.feat-split .features{grid-template-columns:1fr}}
.icon-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px;list-style:none;padding:0;margin:0}
.icon-cards a{display:block;background:#fff;padding:34px 26px;border-radius:4px;text-decoration:none;color:inherit;box-shadow:0 1px 0 var(--line);transition:.3s}
.icon-cards a:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(0,0,0,.12)}
.icon-cards .ic{width:64px;height:64px;border-radius:50%;background:var(--acc);display:grid;place-items:center;margin-bottom:18px}
.icon-cards .ic svg{width:32px;height:32px;fill:#fff}
.icon-cards h3{font-size:20px;margin:0 0 8px;border:none;padding:0}
.icon-cards p{font-size:14px;color:var(--ink2);margin:0}

/* ===== 流れ ===== */
.steps{list-style:none;padding:0;margin:40px 0 0;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}
.steps li{padding:30px 22px 10px;border-right:1px solid var(--line);display:flex;flex-direction:column}
.steps li:last-child{border-right:none}
.steps li .n{font-family:Oswald,sans-serif;font-size:44px;font-weight:700;color:#dfe3e8;line-height:1}
.steps li h3{margin:8px 0 6px;font-size:20px;border:none;padding:0}
.steps li p{font-size:14px;color:var(--ink2)}
.steps li img{border-radius:4px;margin:0 0 18px;aspect-ratio:4/3;object-fit:cover;width:100%;order:-1}
@media (max-width:800px){.steps{grid-template-columns:1fr 1fr}.steps li:nth-child(2n){border-right:none}}
@media (max-width:480px){.steps{grid-template-columns:1fr}.steps li{border-right:none;border-bottom:1px solid var(--line)}}
.compare{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center;margin:28px 0 0}
.compare figure{margin:0;position:relative}
.compare img{aspect-ratio:4/3;object-fit:cover;width:100%;border-radius:4px;border:1px solid var(--line)}
.compare figcaption{position:absolute;left:12px;top:12px;background:var(--dark);color:#fff;font-family:Oswald,sans-serif;font-size:12px;letter-spacing:.2em;padding:4px 10px;border-radius:2px}
.compare figcaption.acc{background:var(--acc2);color:#111}
.compare .arrow{font-family:Oswald,sans-serif;font-size:28px;color:var(--mute);text-align:center}
.compare .note{grid-column:1/-1;font-size:13px;color:var(--mute);margin:0}
@media (max-width:600px){.compare{grid-template-columns:1fr}.compare .arrow{transform:rotate(90deg)}}
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;list-style:none;padding:0;margin:24px 0 0}
.gallery img{border-radius:4px;aspect-ratio:4/3;object-fit:cover;width:100%}
.gallery-cap .figure{margin:0}
.gallery-cap .figure img{border:none}
.figure{margin:24px 0 0}
.figure img{border-radius:4px;border:1px solid var(--line)}
.figure figcaption{font-size:13px;color:var(--mute);margin-top:8px;letter-spacing:.06em}

/* ===== 採用・連絡先・写真帯 ===== */
.band{position:relative;color:#fff;min-height:420px;display:grid;align-items:center;overflow:hidden;background:var(--dark)}
.band img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.band::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(15,20,25,.9),rgba(15,20,25,.3))}
.band .wrap{position:relative;z-index:1;padding-top:70px;padding-bottom:70px}
.band .kicker{color:#fff}.band .kicker::before{background:#fff}
.band h2{font-size:clamp(26px,3.4vw,40px);font-weight:900;line-height:1.3}
.band p{max-width:520px;color:#e6eaee}
.ct{padding:96px 0;text-align:center}
.ct h2{font-size:clamp(26px,3.4vw,40px);font-weight:900}
.ct .tel{font-family:Oswald,sans-serif;font-size:clamp(36px,6vw,64px);font-weight:700;display:block;margin:10px 0 0;line-height:1.1;color:var(--ink);text-decoration:none}
.ct .tel small{display:block;font-family:"Noto Sans JP",sans-serif;font-size:13px;color:var(--mute);letter-spacing:.1em;margin-top:8px;font-weight:400}
.ct .btn{margin-top:28px}

/* ===== フッター ===== */
.ft{background:var(--dark);color:#9aa4ae;padding:48px 0 26px;font-size:13px}
.ft .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px}
.ft b{color:#fff;font-size:16px;display:block;margin-bottom:8px}
.ft nav{display:flex;flex-wrap:wrap;gap:6px 22px}
.ft a{color:inherit;text-decoration:none}
.ft a:hover{color:#fff}
.ft .copy{width:100%;border-top:1px solid var(--dark2);padding-top:16px;margin-top:10px;font-size:11px;letter-spacing:.1em}
.totop{position:fixed;right:16px;bottom:16px;z-index:40;background:var(--ink);color:#fff;text-decoration:none;padding:10px 14px;border-radius:4px;font-size:11px;letter-spacing:.2em;font-family:Oswald,sans-serif;opacity:.9}

/* ===== お知らせ・フォーム ===== */
.news-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.news-list li{display:flex;flex-wrap:wrap;gap:8px 20px;padding:18px 0;border-bottom:1px solid var(--line);align-items:center}
.news-list time{font-family:Oswald,sans-serif;color:var(--mute);font-size:15px;letter-spacing:.06em}
.news-list a{color:var(--ink);text-decoration:none;font-weight:500}
.news-list a:hover{color:var(--acc)}
.tag{font-size:11px;background:var(--ink);color:#fff;padding:2px 10px;border-radius:2px;letter-spacing:.1em}
.form-box{border:1px solid var(--line);border-radius:4px;padding:24px;background:#fff;margin-top:24px}
.form-fallback{margin-top:12px;font-size:13px;color:var(--mute)}
.notice{background:#fff8e1;border:1px solid #f0d37a;border-radius:4px;padding:12px 16px;margin-bottom:20px}