/* header.css */
/* ヘッダー */
header {
  background-color: rgba(0, 0, 0, 0.7);
  position: fixed;
  width: 100%;
  z-index: 1000;
  transition: all 0.5s ease;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
}

.logo img {
  height: 40px;
}

.menu {
  display: flex;
  align-items: center;
}

.menu ul {
  display: flex;
  list-style: none;
}

.menu li {
  margin-left: 25px;
}

.menu li a {
  color: #fff;
  font-weight: 500;
  position: relative;
}

.menu li a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: #E17A42;
  transition: width 0.3s ease;
}

.menu li a:hover::after {
  width: 100%;
}

.sns {
  margin-left: 30px;
}

.sns a {
  color: #fff;
  font-size: 18px;
  margin-left: 15px;
}

.sns a:hover {
  color: #E17A42;
}

.hamburger {
  display: none;
  cursor: pointer;
  width: 30px;
  height: 20px;
  position: relative;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #fff;
  position: absolute;
  transition: all 0.3s ease;
}

.hamburger span:nth-child(1) {
  top: 0;
}

.hamburger span:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}

.hamburger span:nth-child(3) {
  bottom: 0;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}