@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700&display=swap');

:root {
    --primary-color: #5a7d9a;
    --secondary-color: #f7d24a;
    --text-color: #333;
    --light-text-color: #eee;
    --background-color: #f0f8ff;
    --dark-background-color: #2c3e50;
    --border-radius: 8px;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: linear-gradient(135deg, var(--primary-color), #87ceeb);
    color: var(--light-text-color);
    padding: 40px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header-content {
    position: relative;
    z-index: 10;
}

header h1 {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 8em;
    font-weight: 700;
    margin: 0;
    text-shadow: 4px 4px 8px rgba(0, 0, 0, 0.4);
    letter-spacing: 5px;
    color: #fff;
    background: -webkit-linear-gradient(45deg, #ffffff, #e0f2f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header h2 {
    font-size: 2.5em;
    margin-top: 10px;
    font-weight: 400;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-section {
    position: relative;
    width: 100%;
    height: 70vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    filter: brightness(0.8);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 5;
}

.hero-overlay p {
    color: white;
    font-size: 2.5em;
    font-weight: 700;
    text-align: center;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    padding: 0 20px;
}

section {
    padding: 60px 0;
    text-align: center;
}

section:nth-of-type(even) {
    background-color: #e6f7ff;
}

h3 {
    font-size: 2.8em;
    color: var(--primary-color);
    margin-bottom: 30px;
    position: relative;
    display: inline-block;
}

h3::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--secondary-color);
    margin: 10px auto 0;
    border-radius: 2px;
}

p {
    font-size: 1.1em;
    margin-bottom: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

ul {
    list-style: none;
    padding: 0;
    margin-bottom: 30px;
    display: inline-block;
    text-align: left;
}

ul li {
    font-size: 1.1em;
    margin-bottom: 10px;
    position: relative;
    padding-left: 30px;
}

ul li::before {
    content: '⭐';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
}

/* Buttons */
.button-group {
    margin-top: 40px;
}

.button {
    display: inline-block;
    padding: 15px 30px;
    margin: 10px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.button.primary {
    background-color: var(--primary-color);
    color: white;
    border: 2px solid var(--primary-color);
}

.button.primary:hover {
    background-color: #4a6c86;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.button.secondary {
    background-color: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.button.secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-item {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}


.feature-item h4 {
    font-size: 1.6em;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature-item p {
    font-size: 1em;
    color: #555;
}

footer {
    background-color: var(--dark-background-color);
    color: var(--light-text-color);
    padding: 30px 0;
    text-align: center;
    font-size: 0.9em;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 5em;
    }

    header h2 {
        font-size: 1.8em;
    }

    .hero-overlay p {
        font-size: 1.8em;
    }

    h3 {
        font-size: 2.2em;
    }

    .button {
        padding: 12px 25px;
        font-size: 0.9em;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 3.5em;
    }

    header h2 {
        font-size: 1.4em;
    }

    .hero-overlay p {
        font-size: 1.4em;
    }

    h3 {
        font-size: 1.8em;
    }

    .button-group {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .button {
        width: 80%;
        margin: 5px 0;
    }
}