*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

body{
  font-family:"Hiragino Sans","Yu Gothic",sans-serif;
  background:#f8fbf9;
  color:#24322d;
  line-height:1.8;
}

header{
  background:#ffffff;
  border-bottom:1px solid #e3ece8;
  position:sticky;
  top:0;
  z-index:100;
  padding:0 40px;
}

.header-inner{
  max-width:1200px;
  width:100%;
  margin:0 auto;
  padding:4px 0;
  display:flex;
  justify-content:space-between;
  align-items:center;
}

.logo{
  display:inline-flex;
  align-items:center;
  text-decoration:none;
  flex-shrink:0;
}

.logo img{
  height:72px;
  display:block;
}

nav a{
  margin-left:24px;
  text-decoration:none;
  color:#45635a;
  font-size:15px;
}

.hero{
  background:linear-gradient(135deg,#eef7f3,#ffffff);
  padding:70px 20px;
}

.hero-inner{
  max-width:1100px;
  margin:auto;
}

.hero h1{
  font-size:46px;
  margin-bottom:18px;
  color:#18382f;
}

.hero p{
  font-size:18px;
  color:#5a7269;
  max-width:700px;
}

.container{
  max-width:1100px;
  margin:auto;
  padding:60px 20px;
}

.section{
  margin-bottom:70px;
}

.section h2{
  font-size:34px;
  color:#1f7a5c;
  margin-bottom:30px;
  border-left:6px solid #2c9b73;
  padding-left:16px;
}

.card-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:24px;
}

.card{
  background:#ffffff;
  border:1px solid #e5efea;
  border-radius:18px;
  padding:28px;
  box-shadow:0 8px 25px rgba(0,0,0,0.04);
}

.card h3{
  font-size:22px;
  color:#234b3f;
  margin-bottom:14px;
}

.step{
  margin-bottom:18px;
  padding-left:24px;
  position:relative;
}

.step::before{
  content:"✔";
  position:absolute;
  left:0;
  color:#2c9b73;
  font-weight:bold;
}

.notice{
  background:#edf8f4;
  border-left:5px solid #2c9b73;
  padding:20px;
  border-radius:12px;
  color:#35544a;
}

footer{
  background:#ffffff;
  border-top:1px solid #e5efea;
  padding:30px;
  text-align:center;
  color:#70857d;
  font-size:14px;
}

/* ─── HAMBURGER ─── */
.hamburger{
  display:none;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:5px;
  width:36px;
  height:36px;
  background:none;
  border:none;
  cursor:pointer;
  padding:4px;
  flex-shrink:0;
}

.hamburger span{
  display:block;
  width:22px;
  height:2px;
  background:#24322d;
  border-radius:2px;
  transition:transform 0.3s ease, opacity 0.3s ease;
  transform-origin:center;
}

.hamburger.open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2){ opacity:0; transform:scaleX(0); }
.hamburger.open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* ─── MOBILE (≤ 768px) ─── */
@media(max-width:768px){
  header{
    padding:0 16px;
  }

  .header-inner{
    padding:8px 0;
  }

  .logo img{ height:44px; }

  .hamburger{ display:flex; }

  nav#nav-menu{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    background:rgba(255,255,255,0.98);
    backdrop-filter:blur(8px);
    -webkit-backdrop-filter:blur(8px);
    display:flex;
    flex-direction:column;
    gap:0;
    margin:0;
    border-bottom:1px solid rgba(0,0,0,0.08);
    box-shadow:0 8px 24px rgba(0,0,0,0.1);
    max-height:0;
    overflow:hidden;
    transition:max-height 0.35s ease;
    z-index:99;
  }

  nav#nav-menu.open{ max-height:320px; }

  nav#nav-menu a{
    display:block;
    margin:0;
    padding:16px 24px;
    font-size:15px;
    color:#45635a;
    border-bottom:1px solid rgba(0,0,0,0.05);
  }

  nav#nav-menu a:hover{
    background:rgba(31,122,92,0.05);
    color:#1f7a5c;
  }

  .hero{
    padding:48px 20px;
  }

  .hero h1{
    font-size:clamp(26px,7vw,34px);
    margin-bottom:14px;
  }

  .hero p{
    font-size:15px;
  }

  .container{
    padding:40px 16px;
  }

  .section{
    margin-bottom:48px;
  }

  .section h2{
    font-size:22px;
    margin-bottom:20px;
    padding-left:12px;
  }

  .card-grid{
    gap:16px;
  }

  .card{
    padding:20px 18px;
  }

  .card h3{
    font-size:17px;
    margin-bottom:10px;
  }

  .step{
    font-size:14px;
    margin-bottom:12px;
  }

  .notice{
    font-size:14px;
    padding:16px;
  }

  footer{
    padding:24px 20px;
  }
}