/* SK合同会社 v2 */
:root{
  --bg:#08090d;
  --ink:#e8e9ef;
  --muted:#b8bed0;
  --brand:#46c2ff;
  --brand2:#ffcf66;
  --accent:#9bffb0;
  --card:#11131a;
  --line: rgba(255,255,255,.10);
  --shadow: 0 14px 38px rgba(0,0,0,.55);
  --radius: 14px;
  --max: 1200px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;line-height:1.75}
a{color:var(--brand);text-decoration:none}
img{max-width:100%;display:block}
.muted{color:var(--muted)}

.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.section{padding:80px 0;border-top:1px solid var(--line)}

header.site{
  position:sticky;top:0;z-index:30;
  backdrop-filter:saturate(160%) blur(8px);
  background:linear-gradient(180deg, rgba(8,9,13,.96), rgba(8,9,13,.7));
  border-bottom:1px solid var(--line);
}
header .bar{display:flex;align-items:center;justify-content:space-between;padding:14px 20px}
.logo{font-weight:800;letter-spacing:.08em}
.badge{padding:6px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:12px}
.cta-inline a{margin-left:10px;padding:10px 14px;border-radius:10px;background:#151a26;border:1px solid var(--line)}
.cta-inline a.primary{background:linear-gradient(135deg, var(--brand), var(--brand2)); color:#111; font-weight:700}

.hero{
  position:relative;overflow:hidden;min-height:64vh;display:grid;place-items:center;
  text-align:center;
  background:
    radial-gradient(1400px 600px at 12% -12%, rgba(70,194,255,.35), transparent 60%),
    radial-gradient(1200px 500px at 110% 10%, rgba(255,207,102,.28), transparent 60%),
    radial-gradient(1200px 700px at 60% 120%, rgba(155,255,176,.22), transparent 60%),
    conic-gradient(from 210deg at 50% 30%, #0a0d18, #0b0e19, #0f1322, #0a0b11);
}
/* subtle brushed metal noise overlay */
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.18;
  background-image:
    linear-gradient(90deg, rgba(255,255,255,.06) 0, rgba(255,255,255,0) 6%),
    repeating-linear-gradient(90deg, rgba(255,255,255,.08) 0 1px, transparent 1px 3px);
  mix-blend-mode:overlay;
  filter:blur(.3px);
}
.hero::after{
  content:"";position:absolute;inset:-30%;
  background:radial-gradient(circle at 60% 30%, rgba(255,255,255,.09), transparent 40%);
  filter:blur(80px);opacity:.9;animation:float 16s ease-in-out infinite alternate;
}
@keyframes float{to{transform:translateY(24px) rotate(6deg)}}

.hero .wrap{padding:84px 20px 48px;z-index:2}
.hero h1{font-size:clamp(30px,5vw,56px);line-height:1.12;margin:0 0 14px;font-weight:900;letter-spacing:.02em}
.hero p.lead{color:var(--muted);font-size:clamp(15px,2.3vw,18px);max-width:980px;margin:0 auto 14px}
.hero .detail{color:#cdd3e6;max-width:980px;margin:0 auto 16px;font-size:15px}
.hero .cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:10px}
.hero .cta a{padding:12px 16px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.03)}
.hero .cta a.primary{background:linear-gradient(135deg, var(--brand), var(--brand2)); color:#111; font-weight:800}

.kv{margin:18px auto 0;width:min(900px,90%);}
.kv img{border-radius:16px;border:1px solid var(--line);box-shadow:var(--shadow)}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.grid{display:grid;gap:22px}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.grid.cols-3{grid-template-columns:1fr}.grid.cols-2{grid-template-columns:1fr}}

h2{font-size:clamp(24px,3.6vw,34px);margin:0 0 14px}
h3{margin:0 0 8px}

.feature{display:flex;gap:18px;padding:18px;border-radius:12px;background:#141826;border:1px solid var(--line)}
.feature .num{min-width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg, var(--brand), var(--accent));color:#111;font-weight:900;display:flex;align-items:center;justify-content:center}

.gallery{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
@media(max-width:1000px){.gallery{grid-template-columns:repeat(2,1fr)}}
.gallery img{border-radius:12px;border:1px solid var(--line)}

.list{color:var(--muted);padding-left:18px}
blockquote{border-left:3px solid var(--brand);margin:0;padding:8px 0 8px 12px;color:var(--muted)}

.stats{display:flex;gap:16px;flex-wrap:wrap}
.stat{padding:12px 16px;border:1px dashed var(--line);border-radius:12px;background:#121623}
.stat strong{font-size:20px;display:block}

.footer{padding:34px 0;color:#9aa0af;border-top:1px solid var(--line)}
.footer a{color:#c9d0e2}
small{color:var(--muted)}


/* ===== v3 Mobile Optimizations ===== */
@media (max-width: 640px){
  body{font-size:16px;line-height:1.8}
  header .bar{flex-direction:column;gap:8px;align-items:flex-start}
  .cta-inline{display:flex;gap:8px;flex-wrap:wrap;width:100%}
  .cta-inline a{flex:1 1 auto;text-align:center;height:42px;display:flex;align-items:center;justify-content:center}
  .badge{display:none}
  .hero{min-height:58vh;background:
      radial-gradient(1000px 420px at 12% -12%, rgba(70,194,255,.36), transparent 60%),
      radial-gradient(900px 400px at 110% 10%, rgba(255,207,102,.30), transparent 60%),
      radial-gradient(900px 520px at 60% 120%, rgba(155,255,176,.22), transparent 60%),
      linear-gradient(180deg,#0b0e17,#0a0c13 60%, #0b0f18);
  }
  .hero .wrap{padding:88px 16px 48px}
  .hero h1{font-size:28px}
  .hero .lead{font-size:16px}
  .hero .detail{font-size:15px}
  .kv{margin-top:14px;width:100%}
  .kv img{max-height:260px;object-fit:cover;width:100%}
  .hero .cta{flex-direction:column;gap:10px}
  .hero .cta a{height:46px}
  .stats{gap:10px}
  .stat{flex:1 1 100%;font-size:14px}
  .section{padding:70px 0}
}