:root {
    --primary-blue: #0a4d9e;
    --light-blue: #3a8dff;
    --dark-blue: #032a5e;
    --white: #ffffff;
    --off-white: #f4f7fa;
    --text-color: #333;
    --text-light: #f1f1f1;
    --shadow: 0 4px 8px rgba(0,0,0,0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    background-color: var(--white);
    color: var(--text-color);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Nav */
.main-header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-logo {
    color: var(--primary-blue);
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--dark-blue);
    text-decoration: none;
    font-weight: 700;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--light-blue);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--dark-blue);
    transition: all 0.3s ease-in-out;
}

/* Hero Section */
.hero-section {
    background: url('hero-background.png') no-repeat center center/cover;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--white);
    padding: 0 20px;
    position: relative;
}

.hero-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--light-blue);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-blue);
    transform: translateY(-2px);
}

/* General Section Styling */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--dark-blue);
}

/* Intro Section */
.intro-section {
    background: var(--off-white);
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.intro-text h2 {
    font-size: 2.2rem;
    color: var(--dark-blue);
    margin-bottom: 1rem;
}

.intro-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 20px;
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 15px;
}

.feature-item h3 {
    color: var(--primary-blue);
    margin-bottom: 10px;
}

/* Blog Section */
.blog-section {
    background: var(--off-white);
}

.blog-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.blog-post {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.blog-post:hover {
    transform: translateY(-5px);
}

.blog-post img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.blog-post-content {
    padding: 25px;
}

.blog-post-content h3 {
    margin-bottom: 10px;
    color: var(--dark-blue);
}

.read-more {
    display: inline-block;
    margin-top: 15px;
    color: var(--light-blue);
    text-decoration: none;
    font-weight: 700;
}

.read-more:hover {
    text-decoration: underline;
}

/* CTA Section */
.cta-section {
    background: var(--dark-blue);
    color: var(--white);
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-section p {
    margin-bottom: 2rem;
    font-size: 1.2rem;
}

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

.btn-secondary:hover {
    background: var(--off-white);
    color: var(--primary-blue);
}

/* Footer */
.main-footer {
    background: var(--text-color);
    color: var(--text-light);
    text-align: center;
    padding: 20px 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    }

    .nav-menu.active {
        left: 0;
    }
    
    .nav-item {
        padding: 1.5rem 0;
    }

    .hamburger {
        display: block;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .intro-image {
        grid-row: 1; /* Puts image on top on mobile */
        margin-bottom: 20px;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
}