:root {
  --primary-color: #f9d423; /* Egg yellow */
  --primary-light: #fff9e6;
  --secondary-color: #43a047; /* Nature green */
  --secondary-dark: #2e7d32;
  --text-color: #333;
  --text-light: #666;
  --bg-color: #fff;
  --bg-muted: #fbfbfb;
  --accent-blue: #1e88e5;
  --white: #ffffff;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
  --font-main: 'Noto Sans JP', sans-serif;
}

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

body {
  font-family: var(--font-main);
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
header {
  background-color: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 1rem 0;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background-color: var(--primary-color);
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%; /* Egg shape */
  display: inline-block;
}

nav ul {
  display: flex;
  gap: 2rem;
  align-items: center;
}

/* Language Selector */
.lang-selector {
  margin-left: 1.5rem;
}

#language-select {
  padding: 0.4rem 0.6rem;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.85rem;
  background-color: white;
  cursor: pointer;
  color: var(--text-color);
}

#language-select:focus {
  outline: none;
  border-color: var(--primary-color);
}

nav ul li a {
  font-weight: 500;
  position: relative;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: var(--transition);
}

nav ul li a:hover::after,
nav ul li a.active::after {
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 25px;
  height: 3px;
  background-color: var(--text-color);
  transition: var(--transition);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-light) 0%, #fff 100%);
  padding: 6rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  color: var(--secondary-dark);
}

.hero p {
  font-size: 1.25rem;
  max-width: 700px;
  margin: 0 auto 2rem;
  color: var(--text-light);
}

.btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  border-radius: 100px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-color);
}

.btn-primary:hover {
  background-color: #f7ca00;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(249, 212, 35, 0.4);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: var(--white);
}

.btn-secondary:hover {
  background-color: var(--secondary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(67, 160, 71, 0.4);
}

/* Sections */
section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2.25rem;
  color: var(--secondary-dark);
  position: relative;
  display: inline-block;
  padding-bottom: 1rem;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background-color: var(--primary-color);
  border-radius: 2px;
}

/* Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card {
  background-color: var(--white);
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  transition: var(--transition);
  border: 1px solid #f0f0f0;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.card h3 {
  margin-bottom: 1rem;
  color: var(--secondary-dark);
}

/* Footer */
footer {
  background-color: #333;
  color: var(--white);
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-logo .logo-icon {
  margin-bottom: 1rem;
}

.footer-links h4 {
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
  position: relative;
}

.footer-links h4::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--primary-color);
}

.footer-links ul li {
  margin-bottom: 0.8rem;
}

.footer-links ul li a:hover {
  color: var(--primary-color);
  padding-left: 5px;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #444;
  font-size: 0.9rem;
  color: #999;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }
  
  nav {
    display: none; /* Mobile menu logic in JS */
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .hero {
    padding: 4rem 0;
  }
}

/* Animations */
[data-aos] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-aos].aos-animate {
  opacity: 1;
  transform: translateY(0);
}