/* Separate color study. Typography, photographs, dimensions and spacing inherit unchanged from A1. */
body.black-study{--ink:#080a0b;--paper:#efeee9;--yellow:#ba9c5d;--accent:#ba9c5d;--line:#ffffff25;--muted:#b4b5b2;background:#111315;color:#efeee9}
.black-study .study-bar{background:#191c20;color:#dcdcd7;border-color:#ffffff20}
.black-study .study-links a[aria-current=page],.black-study .study-links a:hover{background:#353839;color:#efeee9}
.black-study .header,.black-study .rough-nav{background:linear-gradient(115deg,#1c1f20,#080a0b 56%,#292b2c);color:#efeee9}
.black-study .brand-mark,.black-study .footer .brand-mark{background:#efeee9}
.black-study .nav-contact{background:linear-gradient(135deg,#313333,#121415);color:#efeee9;box-shadow:inset 0 0 0 1px #ba9c5d70}
.black-study h1 em{color:#efeee9}
.black-study .hero .hero-shade{background:linear-gradient(90deg,#080a0b 0%,#080a0b 40%,#080a0b65 59%,transparent 78%),linear-gradient(0deg,#080a0b88,transparent 28%)}
.black-study .hero-content{position:relative;isolation:isolate}
.black-study .hero-content::before{content:"";position:absolute;z-index:-1;pointer-events:none;left:calc(var(--pad) - 65px);top:18px;width:clamp(220px,25vw,380px);height:clamp(270px,31vw,450px);background:#f2f1eb;opacity:.065;-webkit-mask:url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20652.2%20741.5%22%3E%3Cpath%20fill%3D%22black%22%20fill-rule%3D%22evenodd%22%20d%3D%22M339.5%20106.5%20L339.5%20635.2%20L414.5%20587%20L414.5%20422.9%20L488.8%20422.9%20L448.5%20463.2%20L448.5%20568%20L583.4%20481.5%20L583.4%20442%20L518.2%20368.5%20L568.5%20319.8%20L545.5%20240.2%20L448.4%20180.5%20L448.4%20290.8%20L477.5%20290.8%20L441.5%20328%20L414.5%20328%20L414.5%20155.2%20Z%20M302.6%20104.5%20L74.6%20240.8%20L74.6%20443.1%20L226.6%20443.1%20L226.6%20483%20L74.6%20483%20L74.6%20485.8%20L302.9%20635.8%20L302.9%20333.8%20L159.8%20333.8%20L199.2%20290.8%20L302.6%20290.8%20Z%20M325%200%20L0.2%20195%20L0.2%20528.8%20L322.5%20741.2%20L652%20528.2%20L652%20214.8%20Z%20M320.8%2047%20L611.9%20236.5%20L611.9%20510.2%20L322%20694%20L41.5%20506%20L41.5%20215.2%20Z%22%2F%3E%3C%2Fsvg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20652.2%20741.5%22%3E%3Cpath%20fill%3D%22black%22%20fill-rule%3D%22evenodd%22%20d%3D%22M339.5%20106.5%20L339.5%20635.2%20L414.5%20587%20L414.5%20422.9%20L488.8%20422.9%20L448.5%20463.2%20L448.5%20568%20L583.4%20481.5%20L583.4%20442%20L518.2%20368.5%20L568.5%20319.8%20L545.5%20240.2%20L448.4%20180.5%20L448.4%20290.8%20L477.5%20290.8%20L441.5%20328%20L414.5%20328%20L414.5%20155.2%20Z%20M302.6%20104.5%20L74.6%20240.8%20L74.6%20443.1%20L226.6%20443.1%20L226.6%20483%20L74.6%20483%20L74.6%20485.8%20L302.9%20635.8%20L302.9%20333.8%20L159.8%20333.8%20L199.2%20290.8%20L302.6%20290.8%20Z%20M325%200%20L0.2%20195%20L0.2%20528.8%20L322.5%20741.2%20L652%20528.2%20L652%20214.8%20Z%20M320.8%2047%20L611.9%20236.5%20L611.9%20510.2%20L322%20694%20L41.5%20506%20L41.5%20215.2%20Z%22%2F%3E%3C%2Fsvg%3E") center/contain no-repeat}
.black-study .about{background:linear-gradient(120deg,#1e2123,#101214 70%)}
.black-study .works{background:linear-gradient(120deg,#131618,#242729)}
.black-study .company{background:linear-gradient(115deg,#202326,#111315 76%)}
.black-study .dark{background:linear-gradient(115deg,#0a0c0e,#1d2022)}
.black-study .equipment{background:linear-gradient(135deg,#292c2e,#17191b)}
.black-study .contact{background:linear-gradient(115deg,#292b2c,#0c0e10 70%);color:#efeee9}
.black-study .contact-top,.black-study .works-bottom{border-color:#ffffff25}
.black-study .contact-phone{background:linear-gradient(135deg,#101213,#202325);color:#efeee9;box-shadow:inset 0 0 0 1px #ba9c5d65}
.black-study .contact-phone:hover{background:#2c3032}
.black-study .footer{background:#080a0b}
.black-study .wide-word{color:#454a4d}
.black-study .work-area,.black-study .service-list article p:last-child,.black-study .equipment-copy>p:not(.mini-en){color:#c5c6c2}
.black-study .work-image{background:#1e2224}
.black-study .work-no{background:#080a0be6}
.black-study .yellow,.black-study .outline{background:linear-gradient(135deg,#2d3031,#0d1011);color:#efeee9;box-shadow:inset 0 0 0 1px #ba9c5d80}
.black-study .outline{border-color:#ba9c5d80}
.black-study .yellow:hover,.black-study .outline:hover{background:#343839;color:#fff}
.black-study .text-link{border-color:#ba9c5d}
.black-study .photo-open{background:#ba9c5d;color:#080a0b}
.black-study .floating-phone-hex{fill:#a98d50;stroke:#e2d1ab}
.black-study .floating-contact{color:#f7f4ea}
.black-study .floating-contact:hover .floating-phone-hex{fill:#ba9c5d}
@media(max-width:700px){.black-study .hero .hero-shade{background:linear-gradient(180deg,#080a0bb5,#080a0b40 55%,#080a0bb5),linear-gradient(90deg,#080a0b60,transparent)}.black-study .hero-content::before{left:-28px;top:10px;width:220px;height:280px;opacity:.08}}

/* 2026-09-28: deeper graphite, satin highlights and champagne metal. Paint only. */
body.black-study{--paper:#f3eee3;--yellow:#c6af7a;--accent:#c6af7a;--line:#c6af7a33;--muted:#bcb7ad;color:#f3eee3;background:#0b0c0e}
.black-study .header,.black-study .rough-nav{background:linear-gradient(116deg,#ffffff09,transparent 30%,#c6af7a0a 54%,transparent 72%),linear-gradient(180deg,#27282a 0%,#111214 44%,#08090b 100%);box-shadow:inset 0 1px 0 #ffffff14,inset 0 -1px 0 #c6af7a35}
.black-study .brand-mark,.black-study .footer .brand-mark{background:linear-gradient(135deg,#f1e5c5 0%,#c6af7a 44%,#f2e7cd 55%,#ac9161 100%)}
.black-study .brand-name,.black-study h1,.black-study h1 em{color:#f3eee3}
.black-study .brand-en,.black-study .eyebrow,.black-study .section-kicker>span:first-child,.black-study .contact-top>span:first-child{color:#c6af7a}
.black-study .hero .hero-shade{background:radial-gradient(ellipse at 13% 17%,#c6af7a12,transparent 48%),linear-gradient(90deg,#07080a 0%,#090a0b 39%,#080a0b80 57%,transparent 78%),linear-gradient(0deg,#07080a99,transparent 28%)}
.black-study .hero-content::before{background:linear-gradient(120deg,#b69a63,#eee2c780 44%,#96794c 70%);opacity:.07}
.black-study .about,.black-study .company{background:radial-gradient(ellipse at 0% 0%,#c6af7a0b,transparent 55%),repeating-linear-gradient(0deg,#ffffff02 0 1px,transparent 1px 4px),linear-gradient(120deg,#1a1b1d,#0d0e10 72%)}
.black-study .works{background:radial-gradient(ellipse at 100% 10%,#ffffff08,transparent 55%),linear-gradient(125deg,#0b0d0f,#1b1d20)}
.black-study .dark{background:radial-gradient(ellipse at 8% 0%,#c6af7a09,transparent 56%),linear-gradient(115deg,#07080a,#151719)}
.black-study .equipment,.black-study .contact-phone{background:linear-gradient(120deg,#ffffff08,transparent 40%),repeating-linear-gradient(0deg,#ffffff02 0 1px,transparent 1px 4px),linear-gradient(135deg,#242628,#111315);box-shadow:inset 0 0 0 1px #c6af7a40,inset 0 1px 0 #f3eee312,0 12px 30px #00000024}
.black-study .contact{background:radial-gradient(ellipse at 0% 0%,#c6af7a12,transparent 62%),linear-gradient(120deg,#222326,#08090b 78%);color:#f3eee3}
.black-study .footer{background:linear-gradient(120deg,#101113,#060709);box-shadow:inset 0 1px 0 #c6af7a28}
.black-study .section-kicker,.black-study .contact-top,.black-study .works-bottom,.black-study .company-table>div,.black-study .service-list article{border-color:#c6af7a2e}
.black-study .hero-bottom{border-color:#c6af7a50}
.black-study .wide-word{color:#5f594b}
.black-study .nav-contact,.black-study .yellow,.black-study .outline{background:linear-gradient(110deg,#ffffff0b,transparent 45%,#c6af7a07),linear-gradient(180deg,#2a2b2b,#101214);color:#eee4cc;box-shadow:inset 0 0 0 1px #c6af7a8c,inset 0 2px 0 #ffffff0a,0 5px 16px #00000022}
.black-study .outline{border-color:#c6af7a8c}
.black-study .yellow:hover,.black-study .outline:hover,.black-study .nav-contact:hover{background:linear-gradient(120deg,#363632,#16181a);color:#fff6e0}
.black-study .text-link{border-color:#c6af7a80}
.black-study .photo-open{background:linear-gradient(135deg,#dcc796,#b49a62);color:#101214}
.black-study .floating-phone-hex{fill:#8d784e;stroke:#dcc796}
.black-study .floating-contact:hover .floating-phone-hex{fill:#ab915e}
@media(max-width:700px){.black-study .hero .hero-shade{background:radial-gradient(ellipse at 0% 0%,#c6af7a0e,transparent 65%),linear-gradient(180deg,#08090bbb,#08090b50 55%,#08090bbf),linear-gradient(90deg,#08090b66,transparent)}.black-study .hero-content::before{opacity:.075}}

/* 2026-09-29: 英字の大見出し（WORKS・OUR SERVICE・COMPANY）をシャンパンゴールドで統一。 */
.black-study .display-en{color:#c6af7a}