* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  color: #1f2933;
  line-height: 1.8;
  background: #fff;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.95);
  border-bottom: 1px solid #e5e7eb;
  backdrop-filter: blur(10px);
}

.header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0.04em;
  color: #12355b;
}

.nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
  font-weight: 700;
}

.menu-btn {
  display: none;
  border: 1px solid #12355b;
  background: #fff;
  color: #12355b;
  padding: 8px 12px;
  border-radius: 8px;
}

.hero {
  background:
    linear-gradient(120deg, rgba(18,53,91,0.92), rgba(34,91,133,0.78)),
    url("../images/hero-placeholder.jpg");
  background-size: cover;
  background-position: center;
  color: #fff;
  padding: 110px 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  color: #d6e8ff;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 60px);
  line-height: 1.25;
  margin: 10px 0 22px;
}

.lead {
  font-size: 17px;
  max-width: 720px;
}

.hero-buttons,
.contact-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 800;
  transition: 0.25s;
}

.btn:hover {
  transform: translateY(-2px);
}

.primary {
  background: #f59e0b;
  color: #111827;
}

.secondary {
  border: 1px solid rgba(255,255,255,0.8);
  color: #fff;
}

.hero-card {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.24);
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.25);
}

.hero-card span {
  display: block;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffd58a;
}

.hero-card ul {
  padding-left: 20px;
  margin: 0;
}

.message {
  padding: 56px 0;
  background: #f8fafc;
}

.message h2 {
  color: #12355b;
  font-size: 30px;
  margin-top: 0;
}

.section {
  padding: 86px 0;
}

.gray {
  background: #f3f6f9;
}

.section-title {
  text-align: center;
  margin-bottom: 42px;
}

.section-title p {
  margin: 0;
  color: #f59e0b;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.section-title h2 {
  margin: 6px 0 0;
  font-size: 34px;
  color: #12355b;
}

.section-title.white h2,
.section-title.white p {
  color: #fff;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  padding: 26px;
  box-shadow: 0 12px 28px rgba(18,53,91,0.08);
}

.card h3 {
  margin-top: 0;
  color: #12355b;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.product-grid div {
  background: #fff;
  border-radius: 14px;
  padding: 18px;
  text-align: center;
  font-weight: 800;
  border: 1px solid #e5e7eb;
}

.strength {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.strength div {
  border-left: 5px solid #f59e0b;
  padding-left: 22px;
}

.strength strong {
  font-size: 40px;
  color: #dbeafe;
}

.strength h3 {
  margin: 0 0 8px;
  color: #12355b;
}

.company-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 12px 28px rgba(18,53,91,0.08);
}

.company-table th,
.company-table td {
  padding: 18px 20px;
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
  vertical-align: top;
}

.company-table th {
  width: 200px;
  background: #12355b;
  color: #fff;
}

.contact {
  background: linear-gradient(135deg, #12355b, #225b85);
  color: #fff;
  text-align: center;
}

.white-btn {
  background: #fff;
  color: #12355b;
  border-color: #fff;
}

.note {
  font-size: 13px;
  opacity: 0.85;
}

.footer {
  background: #0b1f33;
  color: #fff;
  text-align: center;
  padding: 22px 0;
  font-size: 13px;
}

@media (max-width: 820px) {
  .nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid #e5e7eb;
  }

  .nav.open {
    display: flex;
  }

  .menu-btn {
    display: block;
  }

  .hero {
    padding: 72px 0;
  }

  .hero-inner,
  .cards,
  .strength {
    grid-template-columns: 1fr;
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .company-table th,
  .company-table td {
    display: block;
    width: 100%;
  }
}