/* デザイン変数 */
:root {
    --clear-blue: #0077b6;    /* 清潔感のある青 */
    --soft-sky: #e0f2f1;      /* 爽やかな水色背景 */
    --mint-green: #26a69a;    /* 安心感のある緑 */
    --pure-white: #ffffff;
    --text-dark: #37474f;     /* 落ち着いたダークグレー */
    --text-light: #607d8b;
    --font-main: 'Zen Kaku Gothic New', sans-serif;
    --font-sub: 'Noto Sans JP', sans-serif;
}

/* 基本設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--pure-white);
    color: var(--text-dark);
    font-family: var(--font-main);
    line-height: 1.8;
    font-size: 18px;
}

/* ヘッダー */
header {
    height: 80px;
    background-color: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid #f0f0f0;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--clear-blue);
    letter-spacing: 0.05em;
}

.logo span {
    color: var(--mint-green);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

/* ヒーローセクション */
.hero {
    padding: 100px 40px;
    background: linear-gradient(135deg, var(--pure-white) 50%, var(--soft-sky) 50%);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.top-label {
    display: inline-block;
    color: var(--mint-green);
    font-weight: 700;
    letter-spacing: 0.1em;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 3.2rem;
    line-height: 1.2;
    margin-bottom: 30px;
    color: var(--clear-blue);
}

.hero p {
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 500px;
}

.cta-button {
    display: inline-block;
    padding: 18px 40px;
    background-color: var(--clear-blue);
    color: var(--pure-white);
    text-decoration: none;
    border-radius: 4px;
    font-weight: 700;
    box-shadow: 0 10px 20px rgba(0, 119, 182, 0.2);
    transition: 0.3s;
}

.cta-button:hover {
    background-color: var(--mint-green);
    transform: translateY(-3px);
}

.hero-visual {
    flex: 1.2;
}

.image-wrapper {
    position: relative;
    padding: 20px;
}

.image-wrapper img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 20px 20px 0 var(--pure-white);
}

/* グリッドセクション */
.grid-section {
    padding: 120px 40px;
    background-color: #fbfcfc;
}

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

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

.section-title h2 {
    font-size: 2.2rem;
    color: var(--clear-blue);
    margin-bottom: 15px;
}

.grid-layout {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-item {
    background-color: var(--pure-white);
    padding: 50px 40px;
    border-top: 5px solid var(--mint-green);
    box-shadow: 0 10px 40px rgba(0,0,0,0.03);
    transition: 0.3s;
}

.item-num {
    font-size: 3rem;
    font-weight: 700;
    color: var(--soft-sky);
    line-height: 1;
    margin-bottom: 20px;
}

.grid-item h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: var(--clear-blue);
}

/* メッセージバナー */
.message-banner {
    position: relative;
    padding: 150px 40px;
    text-align: center;
    background-image: url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e?auto=format&fit=crop&q=80&w=1600');
    background-size: cover;
    background-position: center;
    background-attachment: fixed; /* パララックス効果 */
    color: var(--pure-white);
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 119, 182, 0.7);
}

.banner-content {
    position: relative;
    z-index: 1;
}

.banner-content h2 {
    font-size: 2.8rem;
    margin-bottom: 20px;
}

/* フッター */
footer {
    padding: 80px 40px;
    text-align: center;
    background-color: #f5f5f5;
}

.copyright {
    margin-top: 20px;
    font-size: 0.8rem;
    color: #999;
}

/* レスポンシブ */
@media (max-width: 1000px) {
    .hero {
        background: var(--pure-white);
        padding: 60px 20px;
    }
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    .grid-layout {
        grid-template-columns: 1fr;
    }
    .hero-visual {
        width: 100%;
    }
}