/* リセットとベーススタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2E7D32;
    --secondary-color: #66BB6A;
    --accent-color: #388E3C;
    --text-color: #212121;
    --text-light: #757575;
    --bg-color: #FFFFFF;
    --bg-light: #F1F8F4;
    --bg-section: #E8F5E9;
    --border-color: #C8E6C9;
    --shadow: 0 2px 8px rgba(46, 125, 50, 0.1);
    --shadow-hover: 0 4px 16px rgba(46, 125, 50, 0.2);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ナビゲーション */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 1rem 0;
    transition: var(--transition);
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    width: 100%;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: rotate(15deg);
}

/* ヒーローセクション */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #F1F8F4 0%, #E8F5E9 50%, #C8E6C9 100%);
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="%234CAF50" opacity="0.1"/></svg>');
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0); }
    100% { transform: translateY(-100px); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    max-width: 900px;
    padding: 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--text-color);
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
    animation: fadeInUp 1s ease 0.4s both;
    max-width: 1000px;
    width: 100%;
}

.stat-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.4;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--text-light);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 2px;
    height: 30px;
    background: var(--primary-color);
    margin: 10px auto;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -4px;
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* セクション共通スタイル */
.section {
    padding: 5rem 0;
    position: relative;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 3rem;
}

/* 問題についてセクション */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.problem-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.problem-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.problem-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.problem-card p {
    color: var(--text-light);
    line-height: 1.8;
}

.problem-visualization {
    background: var(--bg-section);
    padding: 3rem;
    border-radius: 15px;
    margin-top: 3rem;
}

.problem-visualization h3 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.visualization-chart {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.chart-item {
    text-align: center;
}

.chart-bar {
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    border-radius: 10px 10px 0 0;
    position: relative;
    margin-bottom: 1rem;
    transition: var(--transition);
    animation: growBar 1s ease;
}

.chart-bar:hover {
    transform: scaleY(1.05);
}

.chart-label {
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    font-weight: bold;
    color: var(--text-color);
    white-space: nowrap;
}

.chart-item p {
    color: var(--text-light);
    font-weight: 500;
}

@keyframes growBar {
    from {
        height: 0;
    }
}

/* 解決策セクション */
.solutions-section {
    background: var(--bg-section);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.solution-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.solution-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.solution-icon {
    font-size: 4rem;
}

.solution-content {
    padding: 2rem;
}

.solution-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.solution-content ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.solution-content li {
    padding: 0.5rem 0;
    color: var(--text-light);
    position: relative;
    padding-left: 1.5rem;
}

.solution-content li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.solution-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.solution-link:hover {
    color: var(--accent-color);
}

/* 活動についてセクション */
.mission-box {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 3rem;
    border-radius: 15px;
    margin-bottom: 4rem;
    text-align: center;
}

.criticism-box {
    background: linear-gradient(135deg, #D32F2F, #F44336);
    color: white;
    padding: 3rem;
    border-radius: 15px;
    margin-bottom: 4rem;
    text-align: center;
}

.mission-box h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.mission-box p {
    font-size: 1.1rem;
    line-height: 1.8;
    opacity: 0.95;
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.activity-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.activity-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.activity-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    opacity: 0.2;
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.activity-item h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.activity-item p {
    color: var(--text-light);
    line-height: 1.8;
}

.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-box {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-box:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-hover);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-desc {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* お知らせセクション */
.news-section {
    background: var(--bg-section);
}

.news-list {
    max-width: 800px;
    margin: 0 auto;
}

.news-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    gap: 2rem;
    transition: var(--transition);
}

.news-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-hover);
}

.news-date {
    font-weight: bold;
    color: var(--primary-color);
    min-width: 120px;
}

.news-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.news-content p {
    color: var(--text-light);
    line-height: 1.8;
}

/* お問い合わせセクション */
.contact-section {
    background: var(--bg-section);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 3rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* フッター */
.footer {
    background: var(--text-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.6);
}

/* ダークモード */
.dark-mode {
    --bg-color: #1a1a1a;
    --bg-light: #2a2a2a;
    --bg-section: #222222;
    --text-color: #e0e0e0;
    --text-light: #b0b0b0;
    --border-color: #404040;
}

.dark-mode .navbar {
    background-color: rgba(26, 26, 26, 0.95);
}

.dark-mode .hero {
    background: linear-gradient(135deg, #2a3a2a 0%, #1a2a1a 100%);
}

.dark-mode .problem-card,
.dark-mode .solution-card,
.dark-mode .activity-item,
.dark-mode .stat-item,
.dark-mode .stat-box,
.dark-mode .news-item,
.dark-mode .contact-form {
    background: var(--bg-light);
    color: var(--text-color);
}

.dark-mode .mission-box {
    background: linear-gradient(135deg, #2a5a2a, #2a4a5a);
}

.dark-mode .problem-visualization {
    background: var(--bg-section);
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .news-item {
        flex-direction: column;
    }

    .news-date {
        min-width: auto;
    }
}

/* スクロールアニメーション */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}