:root {
  --white: #FFFFFF;
  --black: #0A0A0A;
  --text-main: #121212;
  --dark-bg: #0A1410;
  --green: #33855D;
  --green-dark: #007A4D;
  --light-green: #E6F5F0;
  --font-en: 'Inter', sans-serif;
  --font-jp: 'Noto Sans JP', sans-serif;
  --max-width: 1440px;
  --padding-x: 8vw;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-jp);
  background-color: var(--white);
  color: var(--text-main);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

body[data-lang="jp"] .lang-en { display: none !important; }
body[data-lang="en"] .lang-jp { display: none !important; }

sup { font-size: 0.6em; vertical-align: super; line-height: 0; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* HEADER & NAV */
header {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 80px;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--green);
  display: flex; justify-content: space-between; align-items: center;
  padding: 0 var(--padding-x);
  z-index: 1000;
}

.logo-img { height: 36px; width: auto; display: block; }
.nav-container { display: flex; align-items: center; gap: 24px; }
.nav-links { display: flex; gap: 16px; }
.nav-links a {
  font-family: var(--font-en); font-size: 0.85rem; font-weight: 700;
  text-transform: uppercase; padding: 6px 10px; border-radius: 4px;
  transition: all 0.2s;
}
.nav-links a:hover, .nav-links a.active {
  background-color: var(--green); color: var(--white);
}

.lang-switch {
  display: flex; align-items: center; gap: 4px;
  border: 2px solid var(--green); padding: 2px 8px;
  border-radius: 4px; font-family: var(--font-en);
  font-size: 0.8rem; font-weight: 700;
}
.lang-switch button {
  background: none; border: none; cursor: pointer;
  font-weight: inherit; color: var(--black);
  padding: 2px 6px; border-radius: 2px;
}
.lang-switch button.active { background-color: var(--green); color: var(--white); }

/* MAIN LAYOUT */
main { margin-top: 80px; min-height: calc(100vh - 160px); }
section { padding: 80px var(--padding-x); border-bottom: 1px solid var(--light-green); }

.section-title-box { margin-bottom: 40px; }

/* 調整後の見出し・タイポグラフィサイズ */
.section-title-box .sub {
  font-family: var(--font-en);
  font-size: 1.1rem;
  font-weight: 800; letter-spacing: 0.1em;
  color: var(--green); text-transform: uppercase;
  display: block; margin-bottom: 8px;
}

.section-title-box h2 {
  font-family: var(--font-en);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900; line-height: 1.1;
  letter-spacing: -0.01em; text-transform: uppercase;
  color: var(--black);
}

.hero-tag {
  font-family: var(--font-en);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-weight: 800; letter-spacing: 0.05em;
  color: var(--green); text-transform: uppercase;
  margin-bottom: 12px; text-align: center;
}

.hero-intro-text {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 700; line-height: 1.7;
  color: var(--text-main);
}

.mv-card h3 {
  font-family: var(--font-en);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900; line-height: 1.2;
  color: var(--green-dark); margin: 12px 0 16px 0;
}

/* CARDS DESIGN */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px; margin-top: 32px;
}
.custom-card {
  border: 2px solid var(--green); border-radius: 10px;
  padding: 28px; background-color: var(--white);
  box-shadow: 0 8px 24px rgba(0, 168, 107, 0.06);
  transition: transform 0.3s, box-shadow 0.3s;
}
.custom-card:hover {
  transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0, 168, 107, 0.15);
}
.custom-card h4 {
  font-family: var(--font-en);
  font-size: 1.35rem; font-weight: 900;
  color: var(--green); margin-bottom: 12px;
}

.dark-section { background-color: var(--dark-bg); color: var(--white); }
.dark-section .section-title-box h2 { color: var(--white); }
.dark-section .hero-intro-text, .dark-section p { color: var(--white); }
.dark-section .custom-card {
  background-color: #0F1F18;
  color: var(--white);
  border-color: var(--green-dark);
}
.dark-section .custom-card h4 { color: var(--green); }

.image-container {
  width: 100%; max-width: 850px; margin: 32px auto; display: flex; justify-content: center;
}
.image-container img {
  width: 100%; height: auto; display: block; border-radius: 8px; border: 2px solid var(--green);
}

.member-insert-box {
  margin-top: 36px; padding: 32px;
  border: 2px dashed var(--green); border-radius: 10px;
  background-color: var(--light-green); text-align: center;
}

.accent-text { color: var(--green-dark); font-weight: bold; }

/* FOOTER */
footer {
  background-color: var(--black); color: var(--white);
  padding: 40px var(--padding-x); display: flex;
  justify-content: space-between; align-items: center;
  border-top: 4px solid var(--green);
}

/* RESPONSIVE */
@media (max-width: 991px) {
  :root { --padding-x: 5vw; }
  header { padding: 0 16px; height: 70px; }
  main { margin-top: 70px; }
  .nav-links { display: none; }
  section { padding: 50px var(--padding-x); }
  .section-title-box h2 { font-size: 2.2rem; }
  .section-title-box .sub { font-size: 0.95rem; }
  .hero-tag { font-size: 1.2rem; }
  .hero-intro-text { font-size: 1.05rem; }
  .mv-card h3 { font-size: 1.8rem; }
  footer { flex-direction: column; gap: 16px; text-align: center; }
}