/* 
========================================================================
仲間川地区保全利用協定 公式ホームページ プレミアムデザインシステム (styles.css)
========================================================================
*/

/* Google Fontsのインポート */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700;900&family=Outfit:wght@300;400;600;800&display=swap');

/* デザインシステムトークンの定義 */
:root {
    /* カラーパレット */
    --color-primary-green: #0A3A20;      /* 深みのあるマングローブフォレストグリーン */
    --color-primary-green-light: #165634;
    --color-primary-cyan: #007D8A;       /* 透明度の高い汽水域のエメラルドタイド */
    --color-primary-cyan-light: #009EAE;
    --color-bg-sand: #F7F6F3;            /* ビーチの白砂をイメージした温かみのあるクリームホワイト */
    --color-bg-card: #FFFFFF;
    --color-text-dark: #1A2620;          /* 視認性の高いソフトなダークグリーンブラック */
    --color-text-muted: #5C6E64;
    --color-accent-gold: #C5A059;        /* 夕陽やサキマサスオウノキをイメージしたゴールド */
    --color-accent-blue: #2980B9;
    --color-accent-orange: #E67E22;
    --color-accent-red: #D35400;
    
    /* ステータスカラー（ダッシュボード用） */
    --color-status-green: #2ECC71;       /* 正常・運航可 */
    --color-status-yellow: #F1C40F;      /* 注意・混雑 */
    --color-status-red: #E74C3C;         /* 規制中・進入禁止 */

    /* フォントファミリー */
    --font-jp: 'Noto Sans JP', sans-serif;
    --font-en: 'Outfit', sans-serif;

    /* トランジションとシャドウ */
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-micro: all 0.2s ease;
    --shadow-premium: 0 10px 30px rgba(10, 58, 32, 0.05);
    --shadow-hover: 0 20px 40px rgba(10, 58, 32, 0.12);
    --shadow-inner: inset 0 2px 4px rgba(0,0,0,0.06);
    --border-radius-lg: 16px;
    --border-radius-md: 10px;
    --border-radius-sm: 6px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-jp);
    background-color: var(--color-bg-sand);
    color: var(--color-text-dark);
    line-height: 1.8;
    overflow-x: hidden;
}

/* タイポグラフィ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-micro);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* コンテナと共通レイアウト */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-padding {
    padding: 100px 0;
}

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

/* 共通セクションタイトル */
.section-title {
    margin-bottom: 60px;
    text-align: center;
    position: relative;
}

.section-title h2 {
    font-size: 2.2rem;
    color: var(--color-primary-green);
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary-green), var(--color-primary-cyan));
    border-radius: 2px;
}

.section-title p {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin-top: 10px;
}

/* 
========================================================================
1. ヘッダー ＆ ナビゲーション (Header & Navigation)
========================================================================
*/
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(247, 246, 243, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(10, 58, 32, 0.08);
    transition: var(--transition-smooth);
}

header.scrolled {
    padding: 5px 0;
    background: rgba(10, 58, 32, 0.95);
    color: #FFFFFF;
    border-bottom: none;
}

header.scrolled a {
    color: #FFFFFF;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    transition: var(--transition-smooth);
}

header.scrolled .header-container {
    height: 65px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-text h1 {
    font-size: 1.25rem;
    color: var(--color-primary-green);
    line-height: 1.2;
}

header.scrolled .logo-text h1 {
    color: #FFFFFF;
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    display: block;
}

header.scrolled .logo-text span {
    color: rgba(255, 255, 255, 0.7);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-item a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text-dark);
    position: relative;
    padding: 8px 0;
}

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

.nav-item a:hover::after,
.nav-item.active a::after {
    width: 100%;
}

/* スマホ用メニューボタン */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 28px;
    height: 2px;
    background-color: var(--color-text-dark);
    transition: var(--transition-micro);
}

header.scrolled .menu-toggle span {
    background-color: #FFFFFF;
}

/* 
========================================================================
2. ヒーローセクション (Hero Section)
========================================================================
*/
.hero {
    position: relative;
    height: 90vh;
    min-height: 600px;
    background-color: var(--color-primary-green);
    overflow: hidden;
    display: flex;
    align-items: center;
    color: #FFFFFF;
    margin-top: 80px;
}

.hero-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.hero-slide.active {
    opacity: 0.35; /* 画像の上に文字を重ねるため、適度に透過させる */
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10, 58, 32, 0.9) 0%, rgba(0, 125, 138, 0.4) 100%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    max-width: 800px;
    padding-top: 40px;
}

.hero-tag {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(4px);
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: 24px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    text-transform: uppercase;
}

.hero h2 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 24px;
    text-shadow: 0 4px 12px rgba(0,0,0,0.25);
}

.hero p.lead {
    font-size: 1.25rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    max-width: 600px;
    text-shadow: 0 2px 6px rgba(0,0,0,0.25);
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition-micro);
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-cyan), var(--color-primary-cyan-light));
    color: #FFFFFF;
    box-shadow: 0 4px 15px rgba(0, 125, 138, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 125, 138, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #FFFFFF;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

/* 
========================================================================
3. クイックナビゲーションカード (Quick Navigation Cards)
========================================================================
*/
.quick-nav {
    position: relative;
    z-index: 10;
    margin-top: -60px; /* ヒーローの下部に重ねて配置 */
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
    margin-bottom: 80px;
}

.nav-card {
    background-color: var(--color-bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-premium);
    overflow: hidden;
    transition: var(--transition-smooth);
    border: 1px solid rgba(10, 58, 32, 0.03);
    display: flex;
    flex-direction: column;
}

.nav-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.nav-card-image {
    height: 180px;
    overflow: hidden;
    position: relative;
}

.nav-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.nav-card:hover .nav-card-image img {
    transform: scale(1.08);
}

.nav-card-content {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.nav-card-content h4 {
    font-size: 1.2rem;
    color: var(--color-primary-green);
    margin-bottom: 12px;
}

.nav-card-content p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

.nav-card-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary-cyan);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    align-self: flex-start;
}

.nav-card-link i {
    transition: var(--transition-micro);
}

.nav-card:hover .nav-card-link i {
    transform: translateX(4px);
}

/* 
========================================================================
5. 仲間川と保全利用協定について (About the Agreement)
========================================================================
*/
.about-section {
    background-color: #FFFFFF;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-content h3 {
    font-size: 1.6rem;
    color: var(--color-primary-green);
    margin-bottom: 20px;
}

.about-content p {
    font-size: 1rem;
    color: var(--color-text-dark);
    margin-bottom: 24px;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
}

.highlight-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.highlight-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(0, 125, 138, 0.1);
    color: var(--color-primary-cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.highlight-text h4 {
    font-size: 1rem;
    color: var(--color-primary-green);
    margin-bottom: 4px;
}

.highlight-text p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.5;
}

.about-visual {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-hover);
}

.about-visual img {
    width: 100%;
    height: auto;
}

/* 
========================================================================
6. 仲間川ルール「仲間川グレード」 (Nakama River Rules & Map)
========================================================================
*/
.rules-section {
    background-color: var(--color-bg-sand);
}

.rules-intro-box {
    background-color: #FFFFFF;
    padding: 30px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-premium);
    margin-bottom: 40px;
    border-left: 5px solid var(--color-primary-cyan);
}

.rules-intro-box h3 {
    color: var(--color-primary-green);
    margin-bottom: 12px;
    font-size: 1.3rem;
}

.rules-intro-box p {
    font-size: 0.95rem;
    color: var(--color-text-dark);
}

.rules-pdf-container {
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px dashed rgba(10, 58, 32, 0.12);
}

.rules-pdf-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--color-primary-cyan);
    padding: 8px 16px;
    background-color: rgba(0, 125, 138, 0.08);
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(0, 125, 138, 0.2);
    transition: var(--transition-micro);
}

.rules-pdf-link:hover {
    background-color: var(--color-primary-cyan);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 125, 138, 0.2);
}

.rules-pdf-link i.fa-file-pdf {
    font-size: 1.1rem;
    color: #E74C3C;
    transition: var(--transition-micro);
}

.rules-pdf-link:hover i.fa-file-pdf {
    color: #FFFFFF;
}

.rules-pdf-link i.fa-arrow-up-right-from-square {
    font-size: 0.8rem;
    opacity: 0.7;
}

.rules-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
}

.rule-tab-btn {
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 30px;
    border: 1px solid rgba(10, 58, 32, 0.1);
    background-color: #FFFFFF;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: var(--transition-micro);
}

.rule-tab-btn:hover {
    color: var(--color-primary-cyan);
    border-color: var(--color-primary-cyan);
}

.rule-tab-btn.active {
    background-color: var(--color-primary-cyan);
    color: #FFFFFF;
    border-color: var(--color-primary-cyan);
    box-shadow: 0 4px 12px rgba(0, 125, 138, 0.25);
}

.rule-content-wrapper {
    background-color: #FFFFFF;
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-premium);
}

.rule-tab-content {
    display: none;
}

.rule-tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

.rule-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
}

.rule-text-area h3 {
    font-size: 1.5rem;
    color: var(--color-primary-green);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.rule-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.rule-list-item {
    display: flex;
    gap: 16px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(10, 58, 32, 0.06);
}

.rule-list-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.rule-badge {
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 30px;
    background-color: var(--color-primary-cyan);
    color: #FFFFFF;
    flex-shrink: 0;
    align-self: flex-start;
}

.rule-badge.badge-limit { background-color: var(--color-accent-orange); }
.rule-badge.badge-danger { background-color: var(--color-accent-red); }

.rule-info h4 {
    font-size: 1.05rem;
    color: var(--color-text-dark);
    margin-bottom: 6px;
}

.rule-info p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.rule-visual-area {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-left: 1px solid rgba(10, 58, 32, 0.08);
    padding-left: 40px;
}

.rule-visual-area img {
    border-radius: var(--border-radius-md);
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    margin-bottom: 20px;
}

.rule-visual-area p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-align: center;
}

/* 
========================================================================
7. 締結事業者一覧 (Agreement Operators Directory)
========================================================================
*/
.operators-section {
    background-color: #FFFFFF;
}

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 10px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 30px;
    border: 1px solid rgba(10, 58, 32, 0.08);
    background-color: var(--color-bg-sand);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: var(--transition-micro);
}

.filter-btn:hover {
    color: var(--color-primary-green);
    background-color: #FFFFFF;
    border-color: var(--color-primary-green);
}

.filter-btn.active {
    background-color: var(--color-primary-green);
    color: #FFFFFF;
    border-color: var(--color-primary-green);
    box-shadow: 0 4px 12px rgba(10, 58, 32, 0.2);
}

.search-wrapper {
    max-width: 400px;
    margin: 0 auto 40px auto;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 14px 20px 14px 45px;
    border-radius: 30px;
    border: 1px solid rgba(10, 58, 32, 0.12);
    background-color: var(--color-bg-sand);
    font-family: var(--font-jp);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition-micro);
}

.search-input:focus {
    border-color: var(--color-primary-cyan);
    background-color: #FFFFFF;
    box-shadow: 0 0 0 3px rgba(0, 125, 138, 0.15);
}

.search-icon {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.operators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.operator-card {
    background-color: var(--color-bg-sand);
    border-radius: var(--border-radius-lg);
    padding: 30px;
    border: 1px solid rgba(10, 58, 32, 0.04);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition-smooth);
}

.operator-card:hover {
    background-color: #FFFFFF;
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(10, 58, 32, 0.08);
}

.operator-card-header {
    border-bottom: 1px solid rgba(10, 58, 32, 0.08);
    padding-bottom: 15px;
    margin-bottom: 15px;
}

.operator-num {
    font-family: var(--font-en);
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--color-primary-cyan);
    margin-bottom: 4px;
}

.operator-card h4 {
    font-size: 1.15rem;
    color: var(--color-primary-green);
    margin-bottom: 4px;
}

.operator-rep {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.operator-body {
    flex-grow: 1;
    margin-bottom: 20px;
}

.operator-desc {
    font-size: 0.85rem;
    color: var(--color-text-dark);
    margin-bottom: 15px;
    line-height: 1.6;
}

.operator-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.operator-tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 30px;
    background-color: rgba(10, 58, 32, 0.06);
    color: var(--color-text-muted);
}

.operator-tag.tag-powerboat {
    background-color: rgba(0, 125, 138, 0.1);
    color: var(--color-primary-cyan);
}

.operator-tag.tag-canoe {
    background-color: rgba(197, 160, 89, 0.1);
    color: #A37F39;
}

.operator-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.operator-status-text {
    font-size: 0.75rem;
    font-weight: 700;
}

.operator-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: #FFFFFF;
    border: 1px solid rgba(10, 58, 32, 0.1);
    color: var(--color-text-muted);
    transition: var(--transition-micro);
}

.operator-card:hover .operator-btn {
    background-color: var(--color-primary-cyan);
    color: #FFFFFF;
    border-color: var(--color-primary-cyan);
}

.operator-btn:hover {
    transform: scale(1.1);
}

.operator-main-tours {
    font-size: 0.8rem;
    color: var(--color-text-dark);
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed rgba(10, 58, 32, 0.08);
    line-height: 1.5;
}

.operator-main-tours strong {
    color: var(--color-primary-green);
    display: block;
    margin-bottom: 4px;
    font-size: 0.85rem;
}

/* 
========================================================================
8. 活動実績（環境DNA＆モニタリング） (Activity Records & eDNA)
========================================================================*/
.activity-section {
    background-color: var(--color-bg-sand);
}

.activity-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 50px;
    align-items: stretch;
}

.activity-summary-area {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.activity-intro h3 {
    font-size: 1.5rem;
    color: var(--color-primary-green);
    margin-bottom: 18px;
}

.activity-intro p {
    font-size: 0.95rem;
    color: var(--color-text-dark);
    margin-bottom: 24px;
}

.monitoring-cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.m-card {
    background-color: #FFFFFF;
    border-radius: var(--border-radius-md);
    padding: 20px;
    box-shadow: var(--shadow-premium);
    border-left: 4px solid var(--color-primary-cyan);
    transition: var(--transition-micro);
}

.m-card:hover {
    transform: translateX(5px);
}

.m-card-date {
    font-family: var(--font-en);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary-cyan);
    margin-bottom: 4px;
}

.m-card h4 {
    font-size: 1rem;
    color: var(--color-primary-green);
    margin-bottom: 6px;
}

.m-card p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.5;
}

/* 過去の実績もっと見るボタン＆アコーディオン */
.monitoring-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 10px;
    padding: 10px 22px;
    background-color: #F0FDF4;
    color: var(--color-primary-green);
    border: 1px solid var(--color-primary-cyan);
    border-radius: var(--border-radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-micro);
    text-align: center;
    width: fit-content;
}

.monitoring-toggle-btn:hover {
    background-color: var(--color-primary-cyan);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.monitoring-more-container {
    display: none;
    flex-direction: column;
    gap: 20px;
    margin-top: 20px;
}

.monitoring-more-container.open {
    display: flex;
    animation: fadeInDown 0.3s ease-out forwards;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 環境DNA図鑑ボード（ダーク＆プレミアムスキン） */
.dna-gallery-box {
    background-color: #101F18; /* 高級感あふれるナイトフォレストダーク */
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 50px rgba(10, 58, 32, 0.25);
    padding: 40px;
    color: #FFFFFF;
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.dna-header {
    margin-bottom: 30px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 20px;
}

.dna-header h3 {
    font-size: 1.4rem;
    color: #FFFFFF;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.dna-header h3 i {
    color: var(--color-status-green);
    text-shadow: 0 0 10px rgba(46, 204, 113, 0.4);
}

.dna-header p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
}

.dna-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 5px;
}

.dna-tab-btn {
    padding: 10px 20px;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 30px;
    border: 1px solid rgba(255,255,255,0.1);
    background-color: rgba(255,255,255,0.03);
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: var(--transition-micro);
    white-space: nowrap;
}

.dna-tab-btn:hover {
    color: #FFFFFF;
    border-color: rgba(255,255,255,0.25);
}

.dna-tab-btn.active {
    background-color: var(--color-primary-cyan);
    color: #FFFFFF;
    border-color: var(--color-primary-cyan);
    box-shadow: 0 4px 12px rgba(0, 125, 138, 0.4);
}

.dna-body-content {
    min-height: 250px;
}

.dna-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 16px;
    margin-bottom: 30px;
}

.dna-item-card {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-md);
    padding: 16px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-micro);
}

.dna-item-card:hover, .dna-item-card.active {
    background-color: rgba(0, 125, 138, 0.15);
    border-color: var(--color-primary-cyan);
    transform: translateY(-3px);
}

.dna-item-icon {
    font-size: 1.8rem;
    color: var(--color-primary-cyan-light);
    margin-bottom: 8px;
}

.dna-item-card.active .dna-item-icon {
    color: #FFFFFF;
}

.dna-item-card h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: #FFFFFF;
}

.dna-detail-panel {
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-md);
    padding: 24px;
    display: none;
    animation: fadeIn 0.4s ease;
}

.dna-detail-panel.active {
    display: block;
}

.dna-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 12px;
    margin-bottom: 16px;
}

.dna-detail-title h4 {
    font-size: 1.2rem;
    color: #FFFFFF;
}

.dna-detail-title span {
    font-family: var(--font-en);
    font-style: italic;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
    display: block;
}

.dna-detail-spot {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 30px;
    background-color: rgba(46, 204, 113, 0.15);
    color: var(--color-status-green);
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.dna-detail-redlist-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.dna-detail-redlist {
    font-size: 0.78rem;
    font-weight: 600;
    padding: 5px 10px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.badge-redlist-cr {
    background-color: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.5);
}

.badge-redlist-en {
    background-color: rgba(249, 115, 22, 0.2);
    color: #fdba74;
    border: 1px solid rgba(249, 115, 22, 0.5);
}

.badge-redlist-vu {
    background-color: rgba(245, 158, 11, 0.2);
    color: #fde047;
    border: 1px solid rgba(245, 158, 11, 0.5);
}

.badge-redlist-nt {
    background-color: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
    border: 1px solid rgba(16, 185, 129, 0.5);
}

.dna-detail-desc {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* 
========================================================================
9. フッター (Footer)
========================================================================
*/
footer {
    background-color: var(--color-primary-green);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 30px 0;
    border-top: 5px solid var(--color-primary-cyan);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 50px;
}

.footer-brand h3 {
    font-size: 1.25rem;
    color: #FFFFFF;
    margin-bottom: 8px;
}

.footer-brand span {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    display: block;
    margin-bottom: 20px;
}

.footer-brand p {
    font-size: 0.85rem;
    line-height: 1.6;
}

.footer-links h4 {
    font-size: 1rem;
    color: #FFFFFF;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 8px;
}

.footer-links h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--color-primary-cyan);
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 0.85rem;
    transition: var(--transition-micro);
}

.footer-links a:hover {
    color: #FFFFFF;
    transform: translateX(4px);
    display: inline-block;
}

.footer-info h4 {
    font-size: 1rem;
    color: #FFFFFF;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 8px;
}

.footer-info h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--color-primary-cyan);
}

.footer-info p {
    font-size: 0.85rem;
    margin-bottom: 12px;
    line-height: 1.5;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-bottom p {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom-links a:hover {
    color: #FFFFFF;
}

/* 
========================================================================
10. レスポンシブ調整 ＆ アニメーション (Responsive & Keyframes)
========================================================================
*/

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 992px) {
    .section-padding { padding: 70px 0; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .rule-grid { grid-template-columns: 1fr; gap: 30px; }
    .rule-visual-area { border-left: none; padding-left: 0; border-top: 1px solid rgba(10, 58, 32, 0.08); padding-top: 30px; }
    .activity-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
    .hero h2 { font-size: 2.3rem; }
    .hero p.lead { font-size: 1rem; }
    .quick-nav { margin-top: -30px; }
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--color-bg-sand);
        flex-direction: column;
        align-items: center;
        padding: 40px 20px;
        gap: 16px;
        transition: var(--transition-smooth);
        border-top: 1px solid rgba(10, 58, 32, 0.08);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }
    
    header.scrolled .nav-menu {
        top: 65px;
        height: calc(100vh - 65px);
    }
    
    .nav-menu.open {
        left: 0;
    }
    
    .nav-menu .nav-item {
        width: 100%;
        text-align: center;
    }

    /* モバイルバーガーメニュー内の文字色（背景の砂浜色に対してはっきり読める深緑色に設定） */
    .nav-menu .nav-item a,
    header.scrolled .nav-menu .nav-item a {
        color: var(--color-primary-green) !important;
        font-size: 1.15rem;
        font-weight: 700;
        display: inline-block;
        padding: 12px 28px;
        letter-spacing: 0.05em;
        border-radius: 30px;
        transition: var(--transition-micro);
    }

    .nav-menu .nav-item a::after {
        display: none;
    }

    .nav-menu .nav-item.active a,
    header.scrolled .nav-menu .nav-item.active a,
    .nav-menu .nav-item a:hover {
        color: var(--color-primary-cyan) !important;
        background-color: rgba(0, 125, 138, 0.1);
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .logo-text h1 { font-size: 1.1rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }

    /* 自然調査・保全活動実績のスマホ最適化 */
    .activity-section {
        overflow: hidden;
    }
    .activity-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        min-width: 0;
        width: 100%;
    }
    .activity-summary-area {
        min-width: 0;
        width: 100%;
    }
    .activity-intro h3 {
        font-size: 1.25rem;
        line-height: 1.4;
        margin-bottom: 12px;
    }
    .activity-intro p {
        font-size: 0.88rem;
        line-height: 1.6;
        margin-bottom: 16px;
    }
    .monitoring-cards {
        gap: 14px;
    }
    .m-card {
        padding: 16px;
    }
    .m-card h4 {
        font-size: 0.95rem;
        margin-bottom: 4px;
    }
    .m-card p {
        font-size: 0.82rem;
        line-height: 1.5;
    }

    /* 環境DNAデジタル生物図鑑のスマホ最適化（画面はみ出し完全解消） */
    .dna-gallery-box {
        padding: 24px 16px;
        border-radius: var(--border-radius-md);
        max-width: 100%;
        min-width: 0;
        box-sizing: border-box;
        overflow: hidden;
    }
    .dna-gallery-box > div {
        min-width: 0;
        max-width: 100%;
    }
    .dna-header {
        margin-bottom: 18px;
        padding-bottom: 14px;
    }
    .dna-header h3 {
        font-size: 1.15rem;
        gap: 8px;
        flex-wrap: wrap;
    }
    .dna-header p {
        font-size: 0.8rem;
        line-height: 1.5;
    }
    .dna-tabs {
        display: flex;
        gap: 8px;
        margin-bottom: 18px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 8px;
        scrollbar-width: none;
        max-width: 100%;
        min-width: 0;
    }
    .dna-tabs::-webkit-scrollbar {
        display: none;
    }
    .dna-tab-btn {
        padding: 8px 14px;
        font-size: 0.78rem;
        flex-shrink: 0;
        white-space: nowrap;
    }
    .dna-body-content {
        min-width: 0;
        max-width: 100%;
    }
    .dna-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
        margin-bottom: 18px;
        max-height: 280px;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        padding-right: 4px;
    }
    .dna-grid::-webkit-scrollbar {
        width: 4px;
    }
    .dna-grid::-webkit-scrollbar-thumb {
        background-color: rgba(255, 255, 255, 0.2);
        border-radius: 4px;
    }
    .dna-item-card {
        padding: 12px 6px;
    }
    .dna-item-icon {
        font-size: 1.35rem;
        margin-bottom: 4px;
    }
    .dna-item-card h4 {
        font-size: 0.76rem;
        word-break: break-all;
    }
    .dna-detail-panel {
        padding: 16px;
    }
    .dna-detail-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        padding-bottom: 10px;
        margin-bottom: 12px;
    }
    .dna-detail-title h4 {
        font-size: 1.05rem;
    }
    .dna-detail-spot {
        align-self: flex-start;
        font-size: 0.7rem;
    }
    .dna-detail-redlist-container {
        gap: 6px;
        margin-bottom: 12px;
    }
    .dna-detail-redlist {
        font-size: 0.72rem;
        padding: 4px 8px;
    }
    .dna-detail-desc {
        font-size: 0.8rem;
        line-height: 1.55;
    }
}