:root {
  --bg: #070f1e;
  --bg-soft: #0d1830;
  --card: #101f3d;
  --text: #e8ecf5;
  --muted: #a9b3c8;
  --accent: #d4af37;
  --accent-soft: rgba(212, 175, 55, 0.12);
  --border: rgba(255, 255, 255, 0.12);
  --success: #7fd1a6;
  --danger: #ff8f8f;
  --container: 1140px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Inter", "Noto Sans JP", sans-serif;
  background: radial-gradient(circle at top right, #142a56 0%, var(--bg) 45%);
  color: var(--text);
  line-height: 1.6;
}

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

img {
  max-width: 100%;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(7, 15, 30, 0.85);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 1rem;
}

.brand {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--accent);
}

.brand-sub {
  font-size: 0.8rem;
  color: var(--muted);
}

.nav-toggle {
  display: none;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.main-nav a {
  font-size: 0.95rem;
  color: var(--muted);
  transition: color 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.lang-toggle {
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 10px;
  padding: 0.7rem 1.1rem;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #111;
}

.btn-primary:hover {
  background: #e4c361;
}

.btn-outline {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}

.hero {
  padding: 5.5rem 0 4rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.hero p {
  max-width: 760px;
  color: var(--muted);
  margin: 1rem 0 1.6rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.section {
  padding: 3.8rem 0;
}

.section h2 {
  margin-top: 0;
  font-size: clamp(1.45rem, 2.7vw, 2.05rem);
}

.section-intro {
  color: var(--muted);
  max-width: 840px;
  margin-bottom: 1.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  background: linear-gradient(165deg, rgba(18, 36, 70, 0.95), rgba(13, 24, 48, 0.95));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.2rem;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.6rem;
  font-size: 1.1rem;
}

.card p {
  color: var(--muted);
  margin: 0;
}

.tag {
  display: inline-block;
  margin-bottom: 0.7rem;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  font-size: 0.78rem;
  font-weight: 600;
}

.nda-label {
  margin-top: 0.85rem;
  font-size: 0.78rem;
  color: #d2d9e7;
  opacity: 0.8;
}

.page-header {
  padding: 4rem 0 2.2rem;
}

.page-header h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
}

.page-header p {
  margin-top: 0.8rem;
  color: var(--muted);
  max-width: 850px;
}

.list {
  margin: 0;
  padding-left: 1.1rem;
}

.list li {
  margin-bottom: 0.5rem;
  color: var(--muted);
}

.badge-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid rgba(212, 175, 55, 0.4);
  color: #f5df90;
  background: rgba(212, 175, 55, 0.1);
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

.form-card {
  max-width: 860px;
}

form {
  display: grid;
  gap: 0.9rem;
}

.form-row {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.28rem;
  color: #e2e8f5;
}

input,
select,
textarea {
  width: 100%;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(5, 10, 20, 0.55);
  color: var(--text);
  padding: 0.7rem 0.75rem;
  font-family: inherit;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

.helper {
  color: var(--muted);
  font-size: 0.82rem;
}

.form-message {
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  display: none;
  font-size: 0.9rem;
}

.form-message.success {
  background: rgba(127, 209, 166, 0.15);
  border: 1px solid rgba(127, 209, 166, 0.45);
  color: #bff3d6;
  display: block;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding: 1.2rem 0 2rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 1024px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
  }

  .main-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 74px;
    background: rgba(7, 15, 30, 0.98);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 4%;
    display: none;
  }

  .main-nav.open {
    display: flex;
  }

  .header-actions {
    margin-left: auto;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 4.4rem;
  }
}