/* カラー・フォント定義 */
:root {
    --clean-blue: #f0f7f9;    /* 清潔感のある極薄い水色 */
    --accent-blue: #7da8b8;   /* 落ち着いた青 */
    --warm-beige: #f9f7f2;    /* 柔らかなベージュ */
    --pure-white: #ffffff;
    --text-color: #4a4a4a;
    --text-muted: #888888;
    --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Zen Kaku Gothic New', sans-serif;
}

/* 基本リセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--pure-white);
    color: var(--text-color);
    font-family: var(--font-sans);
    line-height: 2;
    font-size: 18px;
    letter-spacing: 0.03em;
}

/* ヘッダー */
header {
    height: 100px;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    padding: 0 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--accent-blue);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 40px;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    transition: 0.3s;
}

nav a:hover {
    color: var(--accent-blue);
}

/* ヒーローセクション */
.hero {
    height: 100vh;
    background-image: url('https://images.unsplash.com/photo-1490730141103-6cac27aaab94?auto=format&fit=crop&q=80&w=1600');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    color: var(--pure-white);
}

.hero-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.15); /* 非常に薄いオーバーレイ */
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 4rem;
    line-height: 1.4;
    margin-bottom: 30px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.hero p {
    font-size: 1.2rem;
    font-weight: 300;
}

.scroll-label {
    margin-top: 50px;
    font-size: 0.8rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    opacity: 0.8;
}

/* イントロダクション */
.intro-section {
    padding: 150px 0;
    background-color: var(--warm-beige);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.intro-box {
    display: flex;
    align-items: center;
    gap: 100px;
}

.intro-text {
    flex: 1;
}

.sub-title {
    color: var(--accent-blue);
    font-weight: 500;
    font-size: 0.9rem;
    display: block;
    margin-bottom: 20px;
}

.intro-text h2 {
    font-family: var(--font-serif);
    font-size: 2.8rem;
    margin-bottom: 30px;
    color: #333;
}

.intro-img {
    flex: 1;
}

.intro-img img {
    width: 100%;
    border-radius: 200px 200px 0 0; /* 清潔感のあるアーチ形状 */
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

/* フィーチャーカード */
.feature-section {
    padding: 150px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 80px;
}

.section-title h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.card {
    text-align: center;
}

.card img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    margin-bottom: 30px;
    transition: 0.5s ease;
}

.card img:hover {
    filter: sepia(0.3);
}

.card h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.card p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* 整理セクション（フルブリード） */
.tidy-section {
    padding: 200px 0;
    background-image: url('https://images.unsplash.com/photo-1513519245088-0e12902e5a38?auto=format&fit=crop&q=80&w=1600');
    background-size: cover;
    background-attachment: fixed;
    position: relative;
    color: #fff;
}

.tidy-section::before {
    content: '';
    position: absolute;
    top:0; left:0; width:100%; height:100%;
    background-color: rgba(125, 168, 184, 0.7); /* 青色のベール */
}

.tidy-inner {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 40px;
}

.tidy-inner h2 {
    font-family: var(--font-serif);
    font-size: 3rem;
    margin-bottom: 30px;
}

/* フッター */
footer {
    padding: 100px 20px;
    background-color: var(--warm-beige);
    text-align: center;
}

.copyright {
    margin-top: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* レスポンシブ */
@media (max-width: 1000px) {
    .intro-box {
        flex-direction: column-reverse;
        gap: 50px;
        text-align: center;
    }
    .hero h1 {
        font-size: 2.8rem;
    }
    .feature-cards {
        grid-template-columns: 1fr;
    }
}