/* kenchiku.css ― 建築会社 公開サイト（未来感×信頼・鋼青×炭×コンクリート）。素CSS。namespace: body.kc / .kc- */
:root{
  --kc-bg:#f4f6f8; --kc-bg2:#e9edf1; --kc-surface:#fff; --kc-ink:#1a2430; --kc-sub:#56636f; --kc-mute:#8a96a2;
  --kc-line:#dde3ea; --kc-line2:#cdd5de; --kc-primary:#1f4e79; --kc-primary-d:#163a5c; --kc-accent:#e8730c; --kc-accent-d:#c75f06;
  --kc-grad:linear-gradient(90deg,#1f4e79,#2d6fa8); --kc-glow:0 12px 40px -14px rgba(31,78,121,.45);
  --kc-hero-grad:linear-gradient(180deg,rgba(12,20,30,.15) 0%,rgba(12,20,30,0) 28%,rgba(12,20,30,.78) 100%);
  --fd:"Zen Kaku Gothic New","Noto Sans JP",sans-serif; --fdisp:"Zen Kaku Gothic New",sans-serif; --fen:"Archivo","Helvetica Neue",sans-serif;
  --maxw:1180px; --ease:cubic-bezier(.2,.7,.2,1);
}
html[data-theme="dark"]{--kc-bg:#0f151b;--kc-bg2:#161e26;--kc-surface:#1a232c;--kc-ink:#e7eef4;--kc-sub:#a5b3c0;--kc-mute:#73828f;--kc-line:#27323d;--kc-line2:#2f3c48;--kc-primary:#4a90d0;--kc-accent:#f2924a;--kc-glow:0 12px 44px -12px rgba(74,144,208,.5)}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
.kc{margin:0;background:var(--kc-bg);color:var(--kc-ink);font-family:var(--fd);line-height:1.85;-webkit-font-smoothing:antialiased;font-feature-settings:"palt";overflow-x:hidden}
.kc img{max-width:100%;height:auto;display:block} .kc a{color:inherit;text-decoration:none}
.kc h1,.kc h2,.kc h3{margin:0;font-weight:800;line-height:1.35;letter-spacing:.01em}
.kc-wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(1.2rem,4vw,2.2rem)} .kc-narrow{max-width:760px;margin-inline:auto}
.kc-en{font-family:var(--fen)} .kc-eyebrow{font-family:var(--fen);font-weight:700;font-size:.72rem;letter-spacing:.24em;text-transform:uppercase;color:var(--kc-accent);display:inline-flex;align-items:center;gap:.6em}
.kc-eyebrow::before{content:"";width:1.6rem;height:2px;background:var(--kc-grad)}
[data-reveal]{opacity:0;transform:translateY(28px);transition:opacity .8s var(--ease),transform .8s var(--ease);transition-delay:calc(var(--i,0)*.08s)}
[data-reveal].in{opacity:1;transform:none}
/* topbar/header */
.kc-topbar{background:#0f151b;color:#c4cedb}.kc-topbar__in{display:flex;justify-content:space-between;align-items:center;gap:.8rem;padding:.42rem 0;font-size:.78rem}
.kc-topbar__ctx{font-family:var(--fen);color:#8a96a2}.kc-topbar__back{color:#e7eef4;font-weight:700}
@media(max-width:560px){.kc-topbar__ctx{display:none}}
.kc-header{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--kc-bg) 86%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--kc-line);transition:.3s}
.kc-header__in{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.9rem 0}
.kc-header.scrolled .kc-header__in{padding:.5rem 0}
.kc-logo{display:flex;align-items:center;gap:.55rem;font-weight:800;font-size:1.25rem;color:var(--kc-ink)}
.kc-logo__m{width:32px;height:32px;border-radius:8px;background:var(--kc-grad);color:#fff;display:grid;place-items:center;font-family:var(--fen);font-weight:700;box-shadow:var(--kc-glow)}
.kc-logo small{display:block;font-family:var(--fen);font-size:.54rem;letter-spacing:.22em;color:var(--kc-mute);font-weight:700}
.kc-nav{display:flex;align-items:center;gap:clamp(.6rem,1.6vw,1.3rem)}
.kc-nav a{font-size:.85rem;color:var(--kc-sub);position:relative;padding:.2em 0;white-space:nowrap}
.kc-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:100%;height:2px;background:var(--kc-grad);transform:scaleX(0);transform-origin:left;transition:.3s}
.kc-nav a:hover::after,.kc-nav a.on::after{transform:scaleX(1)} .kc-nav a:hover,.kc-nav a.on{color:var(--kc-primary)}
.kc-navtoggle{display:none;border:0;background:none;cursor:pointer;color:var(--kc-ink);padding:.3rem}
.kc-theme{border:1px solid var(--kc-line2);background:none;color:var(--kc-sub);cursor:pointer;border-radius:999px;width:34px;height:34px;display:grid;place-items:center;flex:none}
@media(max-width:920px){.kc-navtoggle{display:inline-flex}.kc-nav{position:fixed;inset:0 0 0 auto;width:min(80vw,300px);background:var(--kc-surface);flex-direction:column;align-items:flex-start;gap:.1rem;padding:4.5rem 1.5rem;transform:translateX(100%);transition:.3s;box-shadow:-12px 0 40px rgba(0,0,0,.25);z-index:40}.kc-nav.open{transform:none}.kc-nav a{padding:.7rem 0;width:100%;border-bottom:1px solid var(--kc-line);font-size:1rem}.kc-nav a::after{display:none}}
/* buttons */
.kc-btn{display:inline-flex;align-items:center;gap:.5em;font-family:var(--fd);font-weight:700;font-size:.92rem;padding:.8em 1.6em;border-radius:8px;border:1px solid var(--kc-primary);background:var(--kc-primary);color:#fff;cursor:pointer;transition:.2s}
.kc-btn:hover{background:var(--kc-primary-d);border-color:var(--kc-primary-d);transform:translateY(-2px);box-shadow:var(--kc-glow)}
.kc-btn--acc{background:var(--kc-accent);border-color:var(--kc-accent)}.kc-btn--acc:hover{background:var(--kc-accent-d);border-color:var(--kc-accent-d)}
.kc-btn--ghost{background:transparent;color:var(--kc-ink);border-color:var(--kc-line2)}.kc-btn--ghost:hover{background:var(--kc-ink);color:var(--kc-bg)}
.kc-link{font-family:var(--fen);font-weight:600;font-size:.82rem;border-bottom:1px solid currentColor;padding-bottom:2px}.kc-link:hover{color:var(--kc-accent)}
/* hero */
.kc-hero{position:relative;min-height:clamp(480px,86vh,820px);display:flex;align-items:flex-end;overflow:hidden;background:#0f151b}
.kc-hero__media{position:absolute;inset:-6%;z-index:0}.kc-hero__media::after{content:"";position:absolute;inset:0;background:var(--kc-hero-grad)}
.kc-kb{animation:kc-kb 22s ease-in-out infinite alternate}@keyframes kc-kb{from{transform:scale(1.04)}to{transform:scale(1.16) translate(-2%,-2%)}}
.kc-hero__in{position:relative;z-index:2;width:100%;padding-block:clamp(2.4rem,7vw,5rem);color:#fff}
.kc-hero__since{font-family:var(--fen);font-size:.74rem;letter-spacing:.3em;text-transform:uppercase;color:#f0c89a}
.kc-hero h1{color:#fff;font-size:clamp(2rem,6.5vw,4.4rem);font-weight:800;line-height:1.15;margin:.5rem 0 .7rem;text-shadow:0 6px 40px rgba(0,0,0,.45)}
.kc-hero h1 em{font-style:normal;color:transparent;background:linear-gradient(90deg,#f2924a,#e8730c);-webkit-background-clip:text;background-clip:text}
.kc-hero p{color:#e6edf3;max-width:32em;margin:0;font-size:clamp(.95rem,1.6vw,1.12rem)}
.kc-hero__cta{display:flex;gap:.8rem;margin-top:1.5rem;flex-wrap:wrap}.kc-hero__cta .kc-btn--ghost{color:#fff;border-color:rgba(255,255,255,.6)}
.kc-ph{position:relative;height:100%;background:linear-gradient(135deg,#2a3a4a,#1f2e3c 60%,#43576b);display:flex;align-items:center;justify-content:center;overflow:hidden}
.kc-ph::before{content:"";position:absolute;inset:0;opacity:.5;background-image:linear-gradient(transparent 95%,rgba(255,255,255,.06) 95%),linear-gradient(90deg,transparent 95%,rgba(255,255,255,.06) 95%);background-size:32px 32px}
.kc-ph__m{position:relative;font-family:var(--fen);font-size:.62rem;letter-spacing:.24em;text-transform:uppercase;color:rgba(255,255,255,.4)}
.kc-ph--4x3{aspect-ratio:4/3}
/* sections / pagehead */
.kc-sec{padding:clamp(2.8rem,6.5vw,5rem) 0}.kc-sec--alt{background:var(--kc-bg2)}
.kc-head{margin-bottom:1.8rem}.kc-h2{font-size:clamp(1.6rem,3.4vw,2.4rem)}.kc-lead{color:var(--kc-sub);max-width:44em}
.kc-pagehead{position:relative;background:#0f151b;color:#fff;padding:clamp(3rem,8vw,5rem) 0 clamp(2.2rem,5vw,3.2rem);overflow:hidden}
.kc-pagehead__bg{position:absolute;inset:0;z-index:0}.kc-pagehead__bg .kc-ph{opacity:.5}.kc-pagehead::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(12,20,30,.5),rgba(12,20,30,.82))}
.kc-pagehead .kc-wrap{position:relative;z-index:2}.kc-pagehead h1{font-size:clamp(1.8rem,5vw,3rem)}.kc-crumb{font-family:var(--fen);font-size:.74rem;letter-spacing:.16em;color:#f0a35a;margin-bottom:.5rem}
/* grid/cards (works) */
.kc-grid{display:grid;gap:clamp(1.2rem,2.6vw,1.8rem)}.kc-grid--3{grid-template-columns:repeat(3,1fr)}.kc-grid--2{grid-template-columns:1fr 1fr}.kc-grid--4{grid-template-columns:repeat(4,1fr)}
@media(max-width:860px){.kc-grid--3,.kc-grid--4{grid-template-columns:1fr 1fr}}@media(max-width:560px){.kc-grid--2,.kc-grid--3,.kc-grid--4{grid-template-columns:1fr}}
.kc-work{background:var(--kc-surface);border:1px solid var(--kc-line);border-radius:12px;overflow:hidden;transition:.35s var(--ease);display:block}
.kc-work:hover{transform:translateY(-6px);box-shadow:var(--kc-glow);border-color:transparent}
.kc-work__media{aspect-ratio:4/3;overflow:hidden;position:relative}.kc-work__media .kc-ph{transition:.6s var(--ease)}.kc-work:hover .kc-work__media .kc-ph{transform:scale(1.08)}
.kc-work__b{padding:1rem 1.1rem}.kc-work__cat{font-family:var(--fen);font-size:.64rem;letter-spacing:.12em;text-transform:uppercase;color:var(--kc-accent)}
.kc-work__t{font-weight:800;margin:.25rem 0 .35rem}.kc-work__meta{color:var(--kc-sub);font-size:.82rem}
.kc-badge{display:inline-block;font-size:.64rem;font-weight:700;padding:.16em .55em;border-radius:4px;background:var(--kc-bg2);color:var(--kc-sub);margin-right:.3rem}
.kc-badge--360{background:var(--kc-primary);color:#fff}.kc-badge--ba{background:var(--kc-accent);color:#fff}
.kc-filter{display:flex;gap:.4rem;flex-wrap:wrap;margin-bottom:1.6rem}
.kc-chip{border:1px solid var(--kc-line2);background:var(--kc-surface);color:var(--kc-sub);border-radius:999px;padding:.4em 1.1em;font-size:.85rem;font-weight:700}
.kc-chip.on,.kc-chip:hover{background:var(--kc-grad);border-color:transparent;color:#fff}
/* steps/flow */
.kc-steps{display:grid;gap:1rem}.kc-step{display:grid;grid-template-columns:auto 1fr;gap:1.2rem;background:var(--kc-surface);border:1px solid var(--kc-line);border-radius:12px;padding:1.2rem}
.kc-step__n{font-family:var(--fen);font-weight:800;font-size:1.4rem;color:transparent;background:var(--kc-grad);-webkit-background-clip:text;background-clip:text}
.kc-step h3{font-size:1.05rem;margin-bottom:.2rem}.kc-step p{color:var(--kc-sub);font-size:.86rem;margin:0}
/* feature/cols */
.kc-feat{display:grid;grid-template-columns:auto 1fr;gap:1.1rem;padding:1.4rem 0;border-top:1px solid var(--kc-line)}
.kc-feat__n{font-family:var(--fen);color:var(--kc-accent);font-weight:700}.kc-feat h3{font-size:1.1rem;margin-bottom:.3rem}.kc-feat p{color:var(--kc-sub);font-size:.88rem;margin:0;max-width:46em}
/* info table / news / form */
.kc-info{width:100%;border-collapse:collapse}.kc-info th,.kc-info td{text-align:left;padding:.85rem 1rem;border-bottom:1px solid var(--kc-line);font-size:.9rem;vertical-align:top}.kc-info th{width:32%;color:var(--kc-sub);font-weight:700;background:var(--kc-bg2)}
.kc-news{border-top:1px solid var(--kc-line)}.kc-news__i{display:grid;grid-template-columns:auto auto 1fr;gap:.8rem 1.2rem;align-items:center;padding:1.1rem 0;border-bottom:1px solid var(--kc-line)}@media(max-width:560px){.kc-news__i{grid-template-columns:1fr}}
.kc-news__d{font-family:var(--fen);font-size:.8rem;color:var(--kc-mute)}.kc-news__c{font-size:.68rem;font-weight:700;padding:.14em .6em;border-radius:999px;background:var(--kc-bg2);color:var(--kc-primary);justify-self:start}.kc-news__t{font-weight:700}
.kc-form{background:var(--kc-surface);border:1px solid var(--kc-line);border-radius:14px;padding:clamp(1.4rem,3vw,2rem)}
.kc-field{margin-bottom:1.1rem}.kc-field label{display:block;font-size:.82rem;font-weight:700;margin-bottom:.35rem}.kc-field .req{color:var(--kc-accent);font-size:.74rem;margin-left:.3em}
.kc-field input,.kc-field select,.kc-field textarea{width:100%;padding:.72em .85em;border:1px solid var(--kc-line2);border-radius:8px;font-family:inherit;font-size:.95rem;background:var(--kc-bg);color:var(--kc-ink)}
.kc-field textarea{min-height:120px;resize:vertical}.kc-grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 1rem}@media(max-width:560px){.kc-grid2{grid-template-columns:1fr}}
.kc-flash{background:rgba(31,78,121,.12);border-left:3px solid var(--kc-primary);color:var(--kc-primary-d);padding:.85rem 1rem;border-radius:0 8px 8px 0;margin-bottom:1.4rem;font-weight:600}
html[data-theme="dark"] .kc-flash{color:#9cc4e8}
.kc-note{background:var(--kc-bg2);border-left:3px solid var(--kc-accent);color:var(--kc-sub);padding:.7rem 1rem;font-size:.82rem;line-height:1.7;border-radius:0 6px 6px 0}
.kc-pains{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}@media(max-width:760px){.kc-pains{grid-template-columns:1fr}}
.kc-pain{background:var(--kc-surface);border:1px solid var(--kc-line);border-radius:12px;padding:1.3rem}.kc-pain__n{font-family:var(--fen);color:var(--kc-accent);font-weight:700;font-size:.8rem}.kc-pain h3{font-size:1.08rem;margin:.5rem 0}.kc-pain p{color:var(--kc-sub);font-size:.88rem;margin:0}
.kc-counts{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}@media(max-width:680px){.kc-counts{grid-template-columns:1fr 1fr}}
.kc-count{text-align:center;padding:1.3rem 1rem;border:1px solid var(--kc-line);border-radius:12px;background:var(--kc-surface)}
.kc-count__n{font-family:var(--fen);font-weight:800;font-size:clamp(1.8rem,4vw,2.6rem);color:transparent;background:var(--kc-grad);-webkit-background-clip:text;background-clip:text}.kc-count__l{font-size:.8rem;color:var(--kc-sub);margin-top:.3rem}
/* footer */
.kc-footer{background:#0f151b;color:#9cabb8;padding:3rem 0 1.6rem;position:relative}.kc-footer::before{content:"";position:absolute;top:0;left:0;width:100%;height:2px;background:var(--kc-grad)}
.kc-footer a{color:#e7eef4}.kc-footer__cols{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:1.8rem;margin-bottom:1.4rem}@media(max-width:700px){.kc-footer__cols{grid-template-columns:1fr}}
.kc-footer small{color:#73828f;font-family:var(--fen)}
.kc-sns{display:flex;gap:.6rem;margin-top:.8rem}.kc-sns a{width:34px;height:34px;border:1px solid #2a3742;border-radius:8px;display:grid;place-items:center;color:#c4cedb;font-family:var(--fen);font-size:.7rem;font-weight:700}.kc-sns a:hover{background:var(--kc-grad);border-color:transparent;color:#fff}
/* 実写画像（プレースホルダ置換） */
.kc-hero__media img{width:100%;height:100%;object-fit:cover;display:block}
.kc-pagehead__bg img{width:100%;height:100%;object-fit:cover;display:block;opacity:.6}
.kc-work__media img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .6s var(--ease)}
.kc-work:hover .kc-work__media img{transform:scale(1.08)}
.kc-figimg{width:100%;height:100%;object-fit:cover;display:block;border-radius:12px;aspect-ratio:4/3}
.kc-ph--4x3 img{width:100%;height:100%;object-fit:cover;display:block;border-radius:12px}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}[data-reveal]{opacity:1!important;transform:none!important}.kc-kb{animation:none}}