/* セブワークス トップ v42: 西新宿の実写真+段ごとの色面。線・番号・ガラス・光は使わない
   手本: Paul Kalkbrenner / Warm & Fuzzy / Anidachi(段ごとに平らな色面) / NOTHIN'(最後に社名を全幅) */
:root{--paper:#EEEEEA;--ink:#121212;--signal:#FF5B22;--stone:#C8CAC4;--sans:"Zen Kaku Gothic New","Hiragino Sans","Yu Gothic",sans-serif}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:18px;line-height:1.9;letter-spacing:.02em;font-feature-settings:"palt";-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul{list-style:none}
::selection{background:var(--signal);color:var(--ink)}
:focus-visible{outline:3px solid var(--signal);outline-offset:3px}
.signal :focus-visible{outline-color:var(--ink)}
.nb{display:inline-block}
.wrap{width:min(1320px,100% - 48px);margin-inline:auto}

/* ヘッダー: 写真の上は白文字、過ぎたら紙の地 */
.hd{position:fixed;inset:0 0 auto;z-index:20;height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;color:#fff;transition:background .35s,color .35s}
.hd.s{background:var(--paper);color:var(--ink)}
.logo{font-weight:900;font-size:22px;letter-spacing:.02em}
.hd nav{display:flex;align-items:center;gap:30px;font-size:15px;font-weight:700}
.hd nav>a:not(.cta){text-underline-offset:6px;text-decoration-thickness:2px}
.hd nav>a:not(.cta):hover{text-decoration-line:underline}
.hd .cta{background:var(--signal);color:var(--ink);padding:10px 18px;transition:background .25s}
.hd .cta:hover{background:#fff}
.mb{display:none;width:44px;height:44px;place-items:center}
.mb i{display:grid;gap:7px;width:26px}.mb i::before,.mb i::after{content:"";height:2px;background:currentColor;transition:transform .3s}
.mb[aria-expanded="true"] i::before{transform:translateY(4.5px) rotate(45deg)}.mb[aria-expanded="true"] i::after{transform:translateY(-4.5px) rotate(-45deg)}
.ov{position:fixed;inset:0;z-index:15;background:var(--signal);color:var(--ink);display:flex;align-items:center;opacity:0;visibility:hidden;transition:opacity .35s,visibility .35s}
.ov.on{opacity:1;visibility:visible}
.ov ul{width:min(1320px,100% - 48px);margin-inline:auto}
.ov a{display:block;font-weight:900;font-size:clamp(26px,6.6vw,44px);line-height:1.5}
body.menu .hd{background:var(--signal);color:var(--ink)}
@media(max-width:960px){.hd nav>a{display:none}.mb{display:grid}}

/* 1画面目: 摩天楼を縦書きの見出しが上る */
.hero{position:relative;height:100svh;min-height:620px;overflow:hidden;background:var(--ink);color:#fff}
.hero .ph{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:62% 30%}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,10,12,.62) 0%,rgba(10,10,12,.18) 46%,rgba(10,10,12,0) 70%),linear-gradient(0deg,rgba(10,10,12,.7) 0%,rgba(10,10,12,0) 34%)}
.hero .in{position:relative;z-index:1;height:100%;width:min(1320px,100% - 48px);margin-inline:auto;display:flex;justify-content:space-between;align-items:flex-end;padding:96px 0 40px}
.hero h1{writing-mode:vertical-rl;align-self:flex-start;font-weight:900;font-size:min(8.6svh,15vw);line-height:1;letter-spacing:.02em}
.hero h1 b{font-weight:900}
.hero .lead{max-width:24em;font-size:17px;font-weight:700;line-height:1.85}
.hero .where{margin-top:14px;font-size:14px;font-weight:400;opacity:.86}
@media(max-width:760px){.hero .in{flex-direction:column;align-items:flex-start;justify-content:space-between;padding:92px 0 32px}.hero h1{font-size:min(7.2svh,17vw)}.hero .lead{font-size:15px}.hero .ph{object-position:58% 30%}}

/* 色面の段 */
.ch{padding:clamp(96px,13vw,190px) 0}
.paper{background:var(--paper);color:var(--ink)}
.signal{background:var(--signal);color:var(--ink)}
.ink{background:var(--ink);color:var(--paper)}
.stone{background:var(--stone);color:var(--ink)}
.ch h2{font-weight:900;font-size:clamp(42px,7.4vw,116px);line-height:1.12;letter-spacing:-.01em}
.more{display:inline-block;margin-top:36px;font-weight:700;font-size:16px;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:8px;transition:text-underline-offset .25s}
.more:hover{text-underline-offset:4px}
.k{font-size:14px;font-weight:700;opacity:.72;margin-bottom:8px}

.about .wrap{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:48px;align-items:end}
.about .txt p{font-size:clamp(18px,1.5vw,21px);max-width:26em}

.svc h2{font-size:clamp(76px,15vw,236px);line-height:.95;letter-spacing:-.03em}
.svc .big{margin-top:clamp(32px,4vw,56px);font-weight:700;font-size:clamp(22px,2.5vw,36px);line-height:1.6;max-width:22em}
.svc .fee{margin-top:56px;max-width:44em}
.svc .fee p:not(.k){font-size:18px}
.svc .ex{margin-top:56px}
.svc .ex ul{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;margin-top:6px}
.svc .ex li{font-size:15px;line-height:1.7}
.svc .ex li b{display:block;font-size:20px;font-weight:900;margin-bottom:6px}
@media(max-width:760px){.svc .ex ul{grid-template-columns:1fr;gap:22px}}

.svc2 .wrap{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(48px,7vw,120px)}
.svc2 h3{font-weight:900;font-size:clamp(32px,3.8vw,56px);line-height:1.2;margin-bottom:24px}
.svc2 h3 small{display:inline-block;vertical-align:middle;margin-left:14px;font-size:14px;font-weight:700;background:var(--paper);color:var(--ink);padding:2px 10px;line-height:1.6}
.svc2 p{font-size:17px;max-width:26em;color:rgba(238,238,234,.88)}

.ptn h2{font-size:clamp(32px,4vw,56px)}
.ptn ul{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;align-items:center;margin-top:64px}
.ptn li{display:grid;place-items:center;height:120px;background:#E2E2DD}
.ptn img{height:34px;width:auto;max-width:72%;object-fit:contain}
.ptn img.a{filter:brightness(0);opacity:.9}
.ptn img.r{height:62px}
.ptn .nt{margin-top:20px;font-size:14px;opacity:.72}
@media(max-width:760px){.ptn ul{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:40px}.ptn li{height:92px}.ptn img{height:28px}.ptn img.r{height:52px}}

.msg .wrap{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:56px;align-items:end}
.msg blockquote{font-weight:900;font-size:clamp(38px,5.4vw,84px);line-height:1.25}
.msg .txt p{font-size:17px;max-width:26em}
.msg .by{margin-top:22px;font-weight:700}

.co h2{font-size:clamp(32px,4vw,56px)}
.co dl{margin-top:56px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:36px 56px;max-width:1000px}
.co dt{font-size:14px;font-weight:700;opacity:.62}
.co dd{font-size:clamp(18px,1.6vw,22px);font-weight:700;line-height:1.6;margin-top:4px}

.fin .wrap{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:56px;align-items:end}
.fin .txt p{font-size:17px;max-width:26em}
.btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:56px;padding:0 28px;font-weight:700;font-size:16px;background:var(--ink);color:var(--paper);transition:background .25s,color .25s}
.btn:hover{background:var(--paper);color:var(--ink)}
.btn.o{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 2px var(--ink)}
.btn.o:hover{background:var(--ink);color:var(--paper)}

@media(max-width:860px){.about .wrap,.msg .wrap,.fin .wrap,.svc2 .wrap{grid-template-columns:1fr;gap:28px}.co dl{grid-template-columns:1fr;gap:24px}}

/* フッター: 社名を幅いっぱいに置き、下の縁で切る */
footer{background:var(--ink);color:var(--paper);padding-top:80px;overflow:hidden}
footer .top{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:40px;font-size:15px}
footer nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px 24px}
footer nav a:hover{text-decoration:underline;text-underline-offset:5px}
footer .wm{font-weight:900;font-size:18.2vw;line-height:.78;letter-spacing:-.04em;margin:72px 0 0 -.03em;white-space:nowrap;color:var(--signal)}
footer .cp{font-size:13px;opacity:.6;padding:20px 0 24px}
@media(max-width:760px){footer .top{grid-template-columns:1fr}footer nav{grid-template-columns:repeat(2,minmax(0,1fr))}footer{padding-bottom:64px}}

/* 開いた瞬間の1回だけ: 見出しが上から下へ現れ、写真が寄る */
@keyframes wipe{from{clip-path:inset(0 0 100% 0)}to{clip-path:inset(0 0 0 0)}}
@keyframes settle{from{transform:scale(1.08)}to{transform:none}}
.hero h1{animation:wipe 1.5s cubic-bezier(.16,1,.3,1) .2s both}
.hero .ph{animation:settle 2.4s cubic-bezier(.16,1,.3,1) both}

/* チャット(assets/chat.js) */
#cb-open{position:fixed;right:20px;bottom:20px;z-index:30;width:56px;height:56px;border-radius:50%;background:var(--ink);color:var(--paper);font-size:0;border:0;cursor:pointer;display:grid;place-items:center;box-shadow:0 0 0 2px var(--paper);transition:background .25s}
#cb-open::before{content:"";width:24px;height:24px;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M4 5h16v11H9l-5 4z' fill='none' stroke='%23000' stroke-width='2' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M4 5h16v11H9l-5 4z' fill='none' stroke='%23000' stroke-width='2' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat}
#cb-open:hover{background:var(--signal);color:var(--ink)}
#cb{position:fixed;right:20px;bottom:88px;z-index:40;width:360px;max-width:calc(100vw - 32px);height:520px;max-height:calc(100vh - 110px);background:#fff;color:var(--ink);display:none;flex-direction:column;overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.35)}
#cb.on{display:flex}
#cb header{padding:16px 20px;background:var(--ink);color:#fff;display:flex;justify-content:space-between;align-items:center;font-size:14px}
#cb header button{color:#fff;font-size:14px}
#cb-log{flex:1;overflow:auto;padding:16px;background:var(--paper);font-size:14px;line-height:1.7}
#cb-sp{padding:6px 16px;font-size:12px;color:#55575A;background:#fff;display:flex;justify-content:space-between;align-items:center}
#cb form{display:flex;gap:6px;padding:10px;background:#fff}
#cb input{flex:1;min-width:0;height:42px;padding:0 12px;border:2px solid var(--stone);font-size:14px;font-family:inherit}
#cb form button{height:42px;padding:0 14px;background:var(--ink);color:#fff;font-size:13px;font-weight:700}
#cb form button.v{background:#fff;color:var(--ink);box-shadow:inset 0 0 0 2px var(--ink)}
@media(max-width:640px){#cb-open{right:14px;bottom:14px;width:52px;height:52px}#cb{right:8px;bottom:76px}}

@media(prefers-reduced-motion:reduce){.hero h1,.hero .ph{animation:none}html{scroll-behavior:auto}}
@media(min-width:861px){.about .wrap{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr)}}.about h2{font-size:clamp(42px,6.2vw,100px)}

.fin h2{font-size:clamp(40px,5.4vw,88px)}
footer .wm{font-size:15.4vw}

/* 取引先ロゴはカラーのまま白い面に置く(10/30 本人指示「白黒やめて」) */
.ptn ul{grid-template-columns:repeat(3,minmax(0,1fr))}
.ptn li{background:#fff}
.ptn img,.ptn img.a{filter:none;opacity:1;height:40px;max-width:66%}
.ptn img.r{height:72px}
.ptn img.al{height:34px}
@media(max-width:760px){.ptn ul{grid-template-columns:repeat(2,minmax(0,1fr))}.ptn img{height:28px;max-width:74%}.ptn img.r{height:54px}.ptn img.al{height:26px}}
footer .wm{font-size:20.2vw}
.ptn img.f{height:64px}
@media(max-width:760px){.ptn img.f{height:44px}}
.ptn img.k{height:44px}
@media(max-width:760px){.ptn img.k{height:30px}}

/* 最近の活動(トップ) */
.act .hd2{display:flex;justify-content:space-between;align-items:end;gap:24px;flex-wrap:wrap}
.act h2{font-size:clamp(32px,4vw,56px);color:var(--paper)}
.act .hd2 .more{margin-top:0;color:var(--paper)}
.act ul{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:48px}
.act a{display:block;color:var(--paper)}
.act img{width:100%;aspect-ratio:4/5;object-fit:cover;transition:opacity .3s}
.act a:hover img{opacity:.82}
.act time{display:block;margin-top:16px;font-size:14px;font-weight:700;color:rgba(238,238,234,.7)}
.act b{display:block;margin-top:4px;font-size:18px;font-weight:700;line-height:1.6;word-break:auto-phrase}
@media(max-width:760px){.act ul{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:12px;margin-right:-24px;padding-right:24px}.act li{flex:0 0 78%;scroll-snap-align:start}}