/* 変数定義 */
:root {
    --primary-color: #2e7d32; /* ロゴの緑 */
    --secondary-color: #1a237e; /* ロゴの紺 */
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
}

/* 全体設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    line-height: 1.8;
    color: var(--text-color);
    scroll-behavior: smooth;
}

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

.section {
    padding: 100px 0;
}

.bg-light {
    background-color: var(--light-bg);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50%;
    height: 3px;
    background: var(--primary-color);
}

/* ヘッダー */
header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 40px;
}

.logo-text {
    font-weight: bold;
    font-size: 1.2rem;
    letter-spacing: 1px;
}

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

nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    transition: 0.3s;
}

nav ul li a:hover {
    color: var(--primary-color);
}

/* ヒーロー */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.4)), 
                url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?auto=format&fit=crop&q=80&w=2000'); /* 世界をイメージした背景 */
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-align: center;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    max-width: 800px;
}

/* ボタン */
.btn {
    display: inline-block;
    padding: 15px 35px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: #1b5e20;
    transform: translateY(-3px);
}

.btn-outline {
    border: 2px solid var(--white);
    color: var(--white);
    margin-left: 15px;
}

.btn-outline:hover {
    background-color: var(--white);
    color: var(--text-color);
}

/* コンセプト */
.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.concept-card {
    padding: 40px;
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    text-align: center;
}

.concept-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

/* サービス */
.service-list {
    max-width: 800px;
    margin: 0 auto;
}

.service-item {
    background: var(--white);
    padding: 30px;
    margin-bottom: 20px;
    border-left: 5px solid var(--primary-color);
    border-radius: 0 10px 10px 0;
}

/* コンタクト */
.contact-box {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-form {
    margin-top: 40px;
    text-align: left;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
}

.full-width {
    width: 100%;
}

/* フッター */
footer {
    padding: 40px 0;
    background: var(--secondary-color);
    color: var(--white);
    text-align: center;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .hero-content h1 { font-size: 2.5rem; }
    nav { display: none; } /* モバイルメニューは簡易化 */
}