/* ============================================
   ARC CONSULTING — 経営コンサルタント
   Theme: Navy Corporate / Magazine Layout / Data-driven
   STANDALONE — Unique: 3-column magazine grid
   ============================================ */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Noto Sans JP','Inter',sans-serif;color:#64748b;background:#fff;font-size:14px;line-height:1.9;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:rgba(99,102,241,.12)}

:root{
  --navy:#0f172a;--navy2:#1e293b;--indigo:#6366f1;--indigo2:#4f46e5;--indigo-light:#eef2ff;
  --heading:#0f172a;--text:#64748b;--border:#e2e8f0;
  --fe:'Inter',sans-serif;--sans:'Noto Sans JP','Inter',sans-serif;
  --r:6px;
}

/* === HEADER — Clean corporate === */
.hdr{position:fixed;top:0;left:0;width:100%;z-index:800;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 clamp(1.5rem,4vw,3rem);height:56px}
.hdr-logo{font-family:var(--fe);font-size:.85rem;font-weight:800;color:var(--navy);letter-spacing:.03em}
.hdr-logo span{color:var(--indigo);font-weight:400;margin-left:.2rem}
.hdr-nav{display:flex;align-items:center;gap:1.5rem}
.hdr-nav a{font-size:.7rem;font-weight:500;color:var(--text);transition:color .2s}
.hdr-nav a:hover{color:var(--heading)}
.hdr-cta{font-size:.65rem;font-weight:700;padding:.4rem 1.2rem;background:var(--navy);color:#fff;border-radius:var(--r);transition:all .3s}
.hdr-cta:hover{opacity:1;background:var(--indigo)}
@media(max-width:768px){.hdr-nav a:not(.hdr-cta){display:none}}

/* === HERO — Magazine headline style === */
.hero-arc{padding:calc(56px + clamp(4rem,8vw,6rem)) clamp(1.5rem,4vw,3rem) clamp(3rem,6vw,4rem);background:var(--navy);color:#fff;position:relative;overflow:hidden}
.hero-arc::before{content:'ARC';position:absolute;top:50%;right:-5%;transform:translateY(-50%);font-family:var(--fe);font-size:clamp(10rem,25vw,20rem);font-weight:900;color:rgba(255,255,255,.02);letter-spacing:.05em;white-space:nowrap}
.hero-arc-inner{position:relative;z-index:1;display:grid;grid-template-columns:2fr 1fr;gap:3rem;align-items:end}
.hero-arc h1{font-family:var(--fe);font-size:clamp(2rem,4.5vw,3.5rem);font-weight:800;line-height:1.2;letter-spacing:-.02em}
.hero-arc h1 em{font-style:normal;color:var(--indigo)}
.hero-arc-stat{text-align:right}
.hero-arc-stat .big{font-family:var(--fe);font-size:clamp(3rem,6vw,5rem);font-weight:900;color:var(--indigo);line-height:1}
.hero-arc-stat .label{font-size:.6rem;color:rgba(255,255,255,.3);letter-spacing:.1em;text-transform:uppercase;margin-top:.3rem}
@media(max-width:768px){.hero-arc-inner{grid-template-columns:1fr}}

/* === MAGAZINE GRID — 3 columns mixed === */
.mag{padding:clamp(2rem,4vw,3rem) clamp(1.5rem,4vw,3rem)}
.mag-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1.5rem}
.mag-card{background:#fff;border:1px solid var(--border);border-radius:var(--r);overflow:hidden;transition:all .3s}
.mag-card:hover{box-shadow:0 8px 30px rgba(0,0,0,.05);transform:translateY(-2px)}
.mag-card.featured{grid-column:span 2;grid-row:span 2}
.mag-card.featured img{aspect-ratio:16/10}
.mag-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.mag-card-body{padding:1.25rem}
.mag-tag{font-size:.5rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--indigo);margin-bottom:.4rem;display:block}
.mag-card h3{font-size:.9rem;font-weight:700;color:var(--heading);line-height:1.5;margin-bottom:.3rem}
.mag-card.featured h3{font-size:1.2rem}
.mag-card p{font-size:.7rem;line-height:1.7}
@media(max-width:768px){.mag-grid{grid-template-columns:1fr}.mag-card.featured{grid-column:auto;grid-row:auto}}

/* === SERVICES — Numbered horizontal === */
.svc-arc{padding:clamp(3rem,6vw,5rem) clamp(1.5rem,4vw,3rem);background:var(--indigo-light);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.svc-arc h2{font-family:var(--fe);font-size:1.2rem;font-weight:800;color:var(--heading);margin-bottom:2rem}
.svc-arc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.svc-arc-item{background:#fff;border-radius:var(--r);padding:1.5rem;border-left:3px solid var(--indigo);transition:all .3s}
.svc-arc-item:hover{box-shadow:0 4px 16px rgba(99,102,241,.08)}
.svc-arc-item .num{font-family:var(--fe);font-size:1.8rem;font-weight:200;color:rgba(99,102,241,.15);margin-bottom:.5rem}
.svc-arc-item h3{font-size:.85rem;font-weight:700;color:var(--heading);margin-bottom:.3rem}
.svc-arc-item p{font-size:.7rem;line-height:1.8}
@media(max-width:768px){.svc-arc-grid{grid-template-columns:1fr}}

/* === STATS === */
.stats-arc{display:grid;grid-template-columns:repeat(4,1fr);background:var(--navy);color:#fff}
.stat-arc{padding:clamp(1.5rem,3vw,2.5rem);text-align:center;border-right:1px solid rgba(255,255,255,.05)}
.stat-arc:last-child{border-right:none}
.stat-arc-val{font-family:var(--fe);font-size:clamp(1.5rem,3vw,2.2rem);font-weight:800;color:var(--indigo)}
.stat-arc-lbl{font-size:.55rem;color:rgba(255,255,255,.3);margin-top:.15rem;letter-spacing:.08em;text-transform:uppercase}
@media(max-width:640px){.stats-arc{grid-template-columns:repeat(2,1fr)}}

/* === CTA === */
.cta-arc{padding:clamp(3rem,6vw,5rem) clamp(1.5rem,4vw,3rem);text-align:center;background:var(--indigo-light)}
.cta-arc h2{font-family:var(--fe);font-size:clamp(1.1rem,2.5vw,1.5rem);font-weight:800;color:var(--heading);margin-bottom:.4rem}
.cta-arc p{font-size:.75rem;margin-bottom:1.25rem}
.cta-arc-btn{display:inline-flex;align-items:center;gap:.4rem;padding:.6rem 1.8rem;background:var(--navy);color:#fff;border-radius:var(--r);font-size:.72rem;font-weight:700;transition:all .3s}
.cta-arc-btn:hover{opacity:1;background:var(--indigo);box-shadow:0 4px 12px rgba(99,102,241,.2)}

.ftr-arc{padding:1.25rem clamp(1.5rem,4vw,3rem);border-top:1px solid var(--border);display:flex;justify-content:space-between;font-size:.55rem;color:rgba(0,0,0,.15)}
@media(max-width:640px){.ftr-arc{flex-direction:column;gap:.4rem}}

.sa{opacity:0;transform:translateY(18px);transition:opacity .6s cubic-bezier(.22,1,.36,1),transform .8s cubic-bezier(.22,1,.36,1)}
.sa.v{opacity:1;transform:none}
.d1{transition-delay:.1s}.d2{transition-delay:.2s}.d3{transition-delay:.3s}

.badge{position:fixed;bottom:1rem;right:1rem;font-size:.5rem;color:rgba(0,0,0,.08);display:flex;align-items:center;gap:.3rem;z-index:700}
.badge::before{content:'';width:4px;height:4px;background:var(--indigo);border-radius:50%}