html { scroll-behavior: smooth; }

:root {
    --main-color: #ff9800;
    --sub-color: #e0f7fa;
    --text-color: #333;
}
body {
    font-family: 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--sub-color);
    color: var(--text-color);
    line-height: 1.6;
}
header {
    background-color: var(--main-color);
    color: white;
    text-align: center;
    padding: 4rem 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
header h1 {
    margin: 0;
    font-size: 2.8rem;
    letter-spacing: 2px;
}
header p {
    margin-top: 1rem;
    font-size: 1.1rem;
    opacity: 0.9;
}
nav {
    background-color: white;
    display: flex;
    justify-content: center;
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
}
nav a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 1.5rem;
    font-weight: bold;
    transition: color 0.3s;
}
nav a:hover {
    color: var(--main-color);
}
.container {
    max-width: 800px;
    margin: 3rem auto;
    padding: 0 1rem;
}
section {
    background-color: white;
    padding: 2.5rem;
    margin-bottom: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
section h2 {
    border-bottom: 3px solid var(--sub-color);
    padding-bottom: 0.5rem;
    color: var(--main-color);
    margin-top: 0;
    margin-bottom: 1.5rem;
}

.work-card {
    background-color: #fcfcfc;
    border: 1px solid #eee;
    border-left: 5px solid var(--main-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 4px;
}
.work-card h3 {
    margin-top: 0;
    color: var(--text-color);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}
.work-info {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}
.btn-narou {
    display: inline-block;
    background-color: #00a0e9;
    color: white !important;
    padding: 0.5rem 1.2rem;
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: bold;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    transition: opacity 0.2s;
}
.btn-kakuyomu {
    display: inline-block;
    background-color: #212121;
    color: white !important;
    padding: 0.5rem 1.2rem;
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    transition: opacity 0.2s;
}
.btn-narou:hover, .btn-kakuyomu:hover {
    opacity: 0.8;
}
footer {
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
    color: #666;
}