/* ===== Base ===== */
body {
  margin: 0;
  padding: 0;
  background: #121212;
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  color: #EAEAEA;
  min-height: 100vh;
}

/* ===== Header Navigation ===== */
.site-header {
  width: 100%;
  background: #121212;
  border-bottom: 1px solid #2c2c2c;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 600;
  color: #EAEAEA;
  text-decoration: none;
}

.nav-menu {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-menu a,
.dropdown-label {
  color: #FFFFFF;
  text-decoration: none;
  font-size: 0.95rem;
  cursor: pointer;
}

/* ===== Dropdown ===== */
.dropdown {
  position: relative;
}

.dropdown-label {
  padding: 6px 6px;
  display: inline-block;
}

/* ▼ メニュー本体 */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;

  background: #1E1E1E;
  border: 1px solid #2c2c2c;
  border-radius: 12px;

  list-style: none;
  padding: 8px 0;
  margin: 0;

  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.2s ease, transform 0.2s ease;

  z-index: 1001;
}

/* ★ 親 hover 中は常に表示 */
.dropdown:hover .dropdown-menu,
.dropdown-menu:hover {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* メニュー項目 */
.dropdown-menu li a {
  display: block;
  padding: 10px 16px;
  font-size: 0.9rem;
  color: #EAEAEA;
  text-decoration: none;
  white-space: nowrap;
}

.dropdown-menu li a:hover {
  background: #2a2a2a;
  color: #FFFFFF;
}

/* ===== Main Header ===== */
header {
  margin-top: 40px;
  text-align: center;
  animation: fadeIn 1.2s ease;
}

h1 {
  font-weight: 600;
  font-size: 2.2rem;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 1rem;
  color: #BBBBBB;
  margin-bottom: 40px;
}

/* ===== Intro ===== */
.intro {
  width: 90%;
  max-width: 650px;
  margin: 0 auto;
  background: #1E1E1E;
  padding: 30px;
  border-radius: 14px;
  line-height: 1.8;
  box-shadow: 0 0 20px rgba(0,0,0,0.3);
  animation: fadeIn 1.4s ease;
}

.react-message {
  margin-top: 20px;
  font-size: 0.9rem;
  color: #9BCBFF;
}

/* ===== Links ===== */
.links {
  margin: 35px auto 0;
  width: 90%;
  max-width: 650px;
  display: grid;
  gap: 15px;
}

.card {
  display: block;
  padding: 18px 22px;
  border-radius: 12px;
  text-decoration: none;
  background: #1E1E1E;
  color: #EAEAEA;
  border: 1px solid #2c2c2c;
  font-size: 1.05rem;
  transition: all 0.25s ease;
}

.card:hover {
  border-color: #4DA3FF;
  color: #4DA3FF;
  transform: translateY(-3px);
  box-shadow: 0 0 15px rgba(77,163,255,0.35);
}

/* ===== Footer ===== */
footer {
  margin-top: 60px;
  padding: 30px 0;
  font-size: 0.8rem;
  color: #777;
  text-align: center;
}

/* ===== Animation ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}