/* ========================================
   リセット & ベース設定
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット - シックで温かみのある配色 */
    --primary-color: #5a8f7b;
    --primary-dark: #4a7a67;
    --primary-light: #7daa98;
    --secondary-color: #d4a574;
    --accent-color: #c9896a;
    --text-dark: #2c3e50;
    --text-medium: #5a6c7d;
    --text-light: #8b9dad;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --bg-cream: #faf8f5;
    --border-color: #e1e8ed;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    line-height: 1.7;
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* ========================================
   ヘッダー
======================================== */
.header {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 15px 0;
}

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

.header-logo-section {
    flex: 1;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    background: white;
    border-radius: 50%;
    padding: 8px;
    box-shadow: var(--shadow-sm);
}

.logo-text {
    color: white;
}

.organization-name {
    font-size: 0.85rem;
    font-weight: 400;
    margin-bottom: 2px;
    letter-spacing: 0.5px;
    opacity: 0.95;
}

.site-title {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.15);
    padding: 8px 16px;
    border-radius: 25px;
    backdrop-filter: blur(10px);
}

.lang-btn {
    color: white;
    font-size: 0.85rem;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lang-btn.active {
    background: rgba(255, 255, 255, 0.3);
    font-weight: 600;
}

.lang-divider {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
}

/* ナビゲーション */
.main-nav {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
}

.main-nav .container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0;
    width: 100%;
    justify-content: space-evenly;
    align-items: center;
}

.nav-menu li {
    flex: 1;
    text-align: center;
}

.nav-menu a {
    display: block;
    padding: 18px 12px;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 80%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    position: absolute;
    right: 20px;
}

.hamburger span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--text-dark);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 146px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    z-index: 999;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-menu.active {
    max-height: 500px;
}

.mobile-menu ul {
    list-style: none;
    padding: 0;
}

.mobile-menu a {
    display: block;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-dark);
    font-weight: 500;
    transition: all 0.3s ease;
}

.mobile-menu a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
    padding-left: 30px;
}

/* ========================================
   ヒーローセクション
======================================== */
.hero {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

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

.hero-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(90, 143, 123, 0.85) 0%, rgba(74, 122, 103, 0.75) 100%);
    z-index: 1;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: white;
    width: 100%;
}

.hero-subtitle {
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 15px;
    letter-spacing: 2px;
    opacity: 0.95;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero-description {
    font-size: 1.3rem;
    font-weight: 400;
    margin-bottom: 35px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

/* ========================================
   ボタンスタイル
======================================== */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

.btn-text {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-text:hover {
    color: var(--primary-dark);
    gap: 12px;
}

/* ========================================
   コンセプトセクション
======================================== */
.concept {
    padding: 80px 0;
    background: var(--bg-cream);
}

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

.concept-item {
    text-align: center;
    padding: 40px 30px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.concept-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.concept-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

.concept-icon i {
    font-size: 2rem;
    color: white;
}

.concept-item h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 15px;
    line-height: 1.5;
}

.concept-item p {
    color: var(--text-medium);
    font-size: 0.95rem;
    line-height: 1.7;
}

.sp-only {
    display: none;
}

/* ========================================
   セクション共通スタイル
======================================== */
.section-title {
    font-size: 2.6rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-dark);
    position: relative;
    padding-bottom: 20px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.text-center {
    text-align: center;
    margin-top: 40px;
}

/* ========================================
   新着情報セクション
======================================== */
.news {
    padding: 80px 0;
    background: var(--bg-white);
}

.news-list {
    max-width: 900px;
    margin: 0 auto;
}

.news-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.news-item:hover {
    background: var(--bg-light);
}

.news-date {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
    min-width: 100px;
}

.news-category {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.cat-event {
    background: #e3f2fd;
    color: #1976d2;
}

.cat-recruit {
    background: #fff3e0;
    color: #f57c00;
}

.cat-report {
    background: #e8f5e9;
    color: #388e3c;
}

.cat-interview {
    background: #fce4ec;
    color: #c2185b;
}

.news-title {
    flex: 1;
    font-size: 1.05rem;
    font-weight: 500;
}

.news-title a {
    color: var(--text-dark);
}

.news-title a:hover {
    color: var(--primary-color);
}

/* ========================================
   活動紹介セクション
======================================== */
.activities-intro {
    padding: 80px 0;
    background: var(--bg-cream);
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.activity-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

.activity-image {
    height: 280px;
    overflow: hidden;
}

.activity-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.activity-card:hover .activity-image img {
    transform: scale(1.1);
}

.activity-content {
    padding: 30px;
}

.activity-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.activity-content p {
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 20px;
}

/* ========================================
   ボランティア募集セクション
======================================== */
.volunteer-cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

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

.volunteer-cta-text h2 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.4;
}

.volunteer-cta-subtitle {
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 15px;
}

.volunteer-cta-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 30px;
}

.volunteer-cta-image img {
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

/* ========================================
   フッター
======================================== */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-section h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--secondary-color);
}

.footer-org {
    font-size: 0.95rem;
    opacity: 0.9;
    margin-bottom: 10px;
}

.footer-description {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.7;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* ========================================
   レスポンシブデザイン
======================================== */
@media (max-width: 1024px) {
    .concept-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .volunteer-cta-content {
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-top .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .language-switcher {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero {
        height: 500px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 10px;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
    
    .concept-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .sp-only {
        display: inline;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .news-item {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .news-date {
        min-width: auto;
    }
    
    .activities-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .volunteer-cta-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .volunteer-cta-text h2 {
        font-size: 1.8rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .logo {
        width: 50px;
        height: 50px;
    }
    
    .site-title {
        font-size: 1.2rem;
    }
    
    .organization-name {
        font-size: 0.75rem;
    }
    
    .hero {
        height: 450px;
    }
    
    .hero-title {
        font-size: 1.6rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .concept-item {
        padding: 30px 20px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 0.95rem;
    }
}