:root{
  --navy:#123456;
  --green:#2f5d50;
  --red:#b8322a;
  --bg:#f7f7f4;
  --line:rgba(18,52,86,0.12);
  --text:#24313d;
  --muted:#5f6b75;
  --white:#fff;
}

*{
  box-sizing:border-box;
}

body{
  margin:0;
  font-family:"Noto Sans JP", sans-serif;
  background:var(--bg);
  color:var(--text);
  letter-spacing:0.02em;
}


/* ------------------------------
   Hero
------------------------------ */
.hero{
  position:relative;
  min-height:420px;
  background:url("../images/ヘッダー画像.png") center right / cover no-repeat;
}

.hero-overlay{
  position:absolute;
  inset:0;
  background:linear-gradient(
    90deg,
    rgba(255,255,255,0.95),
    rgba(255,255,255,0.72) 45%,
    rgba(255,255,255,0.18)
  );
}

.hero-copy{
  position:relative;
  z-index:1;
  max-width:1200px;
  min-height:420px;
  margin:0 auto;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:flex-start;
  padding:54px 40px;
}

.hero-tagline,
.section-label{
  margin:0 0 14px;
  color:var(--green);
  font-size:13px;
  font-weight:700;
  letter-spacing:0.14em;
  text-transform:uppercase;
}

.hero-copy h1{
  max-width:760px;
  margin:0 0 18px;
  font-family:"Noto Serif JP", serif;
  color:var(--navy);
  font-size:44px;
  line-height:1.35;
}

.hero-lead{
  margin:0 0 28px;
  color:var(--text);
  font-size:20px;
  line-height:1.8;
  font-weight:500;
}

.btn-primary{
  display:inline-block;
  background:var(--red);
  color:#fff;
  padding:14px 26px;
  border-radius:6px;
  text-decoration:none;
  font-weight:700;
  box-shadow:0 8px 20px rgba(184,50,42,0.18);
}

.btn-primary:hover{
  opacity:0.88;
}

/* ------------------------------
   Common sections
------------------------------ */
.container{
  max-width:1200px;
  margin:0 auto;
  padding:0 24px;
}

.container.narrow{
  max-width:940px;
}

.section{
  padding:64px 0;
}

.section h2,
.concept-copy h2,
.cta-copy h2{
  margin:0 0 22px;
  color:var(--navy);
  font-family:"Noto Serif JP", serif;
  font-size:30px;
  line-height:1.5;
}

.section-lead,
.lead-box p,
.concept-copy p,
.cta-copy p{
  margin:0 0 14px;
  font-size:16px;
  line-height:1.9;
  color:var(--text);
}

.center{
  text-align:center;
}

.section-label.center{
  text-align:center;
}

.lead-box {
  background:transparent;
  border-left:none;
  padding:0;
  box-shadow:none;
}

.solution-section{
  background:#fff;
}

/* ------------------------------
   Concept
------------------------------ */
.concept-section{
  padding:70px 0;
  background:linear-gradient(135deg, var(--navy), #1d4b74);
  color:#fff;
}

.concept-wrap{
  display:flex;
  justify-content:center;
}

.concept-copy{
  max-width:900px;
}

.concept-copy .section-label,
.concept-copy h2,
.concept-copy p{
  color:#fff;
}

.concept-copy .section-label{
  opacity:0.78;
}

/* ------------------------------
   Strengths
------------------------------ */
.strength-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:22px;
  margin-top:34px;
}

.strength-card,
.target-card,
.cta-copy{
  background:#fff;
  border:1px solid rgba(18,52,86,0.10);
  border-radius:12px;
  padding:28px;
  box-shadow:0 10px 24px rgba(18,52,86,0.05);
}

.card-number{
  display:inline-block;
  margin-bottom:14px;
  color:var(--red);
  font-size:13px;
  font-weight:800;
  letter-spacing:0.12em;
}

.strength-card h3,
.target-card h3{
  margin:0 0 14px;
  color:var(--navy);
  font-size:20px;
  line-height:1.5;
}

.strength-card p,
.target-card p{
  margin:0;
  color:var(--muted);
  font-size:15px;
  line-height:1.85;
}

/* ------------------------------
   Target
------------------------------ */
.target-section{
  background:#fff;
}

.target-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:20px;
  margin-top:30px;
}

.target-card.full{
  grid-column:1 / -1;
}

/* ------------------------------
   CTA
------------------------------ */
.cta-section{
  padding:74px 0;
  background:var(--bg);
}

.cta-container{
  max-width:940px;
}

.cta-copy{
  text-align:center;
  padding:42px 34px;
}

.cta-copy p{
  max-width:720px;
  margin-left:auto;
  margin-right:auto;
}

.cta-copy .btn-primary{
  margin-top:16px;
}

.pc-only{
  display:inline;
}

/* ------------------------------
   Tablet（～900px）
------------------------------ */
@media (max-width: 900px){
  .header-inner{
    flex-direction:column;
    align-items:flex-start;
    gap:10px;
    padding:12px 16px;
  }

  .nav ul{
    gap:16px;
    flex-wrap:wrap;
  }

  .header-spacer{
    height:96px;
  }

  .hero,
  .hero-copy{
    min-height:340px;
  }

  .hero-copy{
    padding:40px 24px;
  }

  .hero-copy h1{
    font-size:32px;
  }

  .hero-lead{
    font-size:17px;
  }

  .section{
    padding:52px 0;
  }

  .section h2,
  .concept-copy h2,
  .cta-copy h2{
    font-size:25px;
  }

  .strength-grid,
  .target-grid{
    grid-template-columns:1fr;
  }

  .target-card.full{
    grid-column:auto;
  }
}

/* ------------------------------
   Mobile（～600px）
------------------------------ */
@media (max-width: 600px){
  .nav ul{
    flex-direction:column;
    align-items:flex-start;
    gap:8px;
  }

  .logo img{
    height:26px;
  }

  .logo-text{
    font-size:16px;
  }

  .header-spacer{
    height:156px;
  }

  .hero{
    background-position:center;
  }

  .hero,
  .hero-copy{
    min-height:330px;
  }

  .hero-copy{
    padding:28px 18px;
  }

  .hero-copy h1{
    font-size:25px;
  }

  .hero-lead{
    font-size:16px;
  }

  .pc-only{
    display:none;
  }

  .container{
    padding:0 18px;
  }

  .section{
    padding:44px 0;
  }

  .section h2,
  .concept-copy h2,
  .cta-copy h2{
    font-size:22px;
  }

  .lead-box,
  .strength-card,
  .target-card,
  .cta-copy{
    padding:22px;
  }

  .cta-section{
    padding:50px 0;
  }
}