:root {
  --color-primary: #0b3d91;
  --color-primary-dark: #082a66;
  --color-accent: #3fa9f5;
  --color-text: #1c1c1c;
  --color-text-light: #5a5a5a;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7fb;
  --color-border: #e3e8ef;
  --max-width: 1080px;
  --font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.8;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--color-border);
}

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

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.site-logo span {
  color: var(--color-accent);
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--color-text);
  font-weight: 500;
}

.site-nav a.is-current,
.site-nav a:hover {
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--color-primary);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 96px 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.4rem;
  margin: 0 0 24px;
  line-height: 1.5;
}

.hero p {
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto;
  color: #e6edf9;
}

.hero .cta-buttons {
  margin-top: 40px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 4px;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  color: #fff;
  border: 1px solid #fff;
}

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.12);
  text-decoration: none;
}

/* Sections */
.section {
  padding: 88px 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-title {
  text-align: center;
  font-size: 1.8rem;
  margin-bottom: 16px;
  color: var(--color-primary-dark);
}

.section-lead {
  text-align: center;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto 56px;
}

/* Strengths / Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.card {
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 32px 28px;
}

.card h3 {
  color: var(--color-primary);
  font-size: 1.1rem;
  margin-top: 0;
}

.card p {
  color: var(--color-text-light);
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* Service list */
.service-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.service-list li {
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 6px;
  padding: 20px 24px;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.service-list li span {
  display: block;
  margin-top: 6px;
  font-weight: 400;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* Table (company info) */
.info-table {
  width: 100%;
  border-collapse: collapse;
}

.info-table th,
.info-table td {
  text-align: left;
  padding: 18px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.info-table th {
  width: 180px;
  color: var(--color-text-light);
  font-weight: 500;
}

/* Works list */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.works-grid .card .tag {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 999px;
  padding: 2px 12px;
  margin-bottom: 12px;
}

/* Coming soon */
.coming-soon {
  text-align: center;
  padding: 64px 24px;
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  color: var(--color-text-light);
}

.coming-soon strong {
  display: block;
  font-size: 1.3rem;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

/* Contact */
.contact-box {
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 48px;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.contact-box .mail-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 1.2rem;
  font-weight: 700;
}

.contact-box .tel {
  margin-top: 16px;
  color: var(--color-text-light);
}

/* Footer */
.site-footer {
  background-color: var(--color-primary-dark);
  color: #cdd8ec;
  padding: 48px 0 24px;
  font-size: 0.85rem;
}

.site-footer a {
  color: #cdd8ec;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

.footer-copyright {
  text-align: center;
  color: #8fa2c4;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
}

/* Page header (non-home pages) */
.page-header {
  background-color: var(--color-bg-alt);
  padding: 56px 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  color: var(--color-primary-dark);
  margin: 0;
  font-size: 1.8rem;
}

/* Responsive */
@media (max-width: 768px) {
  .site-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background-color: #fff;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-150%);
    transition: transform 0.2s ease;
  }

  .site-nav.is-open {
    transform: translateY(0);
  }

  .site-nav ul {
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 18px;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 64px 0;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .section {
    padding: 56px 0;
  }

  .footer-grid {
    flex-direction: column;
  }
}