/* 1. Google Fonts 読み込み */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@500;700&display=swap');

:root {
  --primary-color-light: #a0e9fd;
  --primary-color-dark:  #57c7f4;
  --button-bg: #ffffff;
  --button-color: #2f4f4f;
  --transition-speed: 0.3s;
}

header {
  display: flex;
  justify-content: left;
  align-items: center;
  padding: 0 2rem;
  height: 80px;
  background: linear-gradient(135deg,var(--primary-color-dark),var(--primary-color-light));
  font-family: 'Montserrat', sans-serif;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-radius: 2rem;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
}

nav ul {
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.menu-item a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: var(--button-bg);
  color: var(--button-color);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 0.5rem;
  box-shadow: 0 5px 15px -8px rgba(0, 0, 0, 0.2);
  transition: 
    background-color var(--transition-speed),
    transform var(--transition-speed),
    box-shadow var(--transition-speed);
}

.menu-item a:hover {
  background-color: rgba(255, 255, 255, 0.9);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -10px rgba(0, 0, 0, 0.25);
}

body{
  background-image: linear-gradient(90deg, rgba(168, 202, 240, 1), rgba(214, 229, 247, 1) 0%, rgba(255, 255, 255, 1) 0% 0%, rgba(201, 224, 255, 1) 27%, rgba(195, 220, 255, 1));

}