/* ===== 基本設定と変数 ===== */
:root {
    --primary-color: #2c5282; /* 伝統的で落ち着いた紺色 */
    --primary-hover-color: #2a4365;
    --dark-color: #1a202c; /* メインのテキストカラー */
    --gray-color: #4a5568; /* サブのテキストカラー */
    --light-gray-color: #f7fafc; /* 背景色 */
    --white-color: #ffffff;
    --border-color: #e2e8f0;
    
    --font-family-base: 'Noto Sans JP', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.8;
    
    --container-width: 1140px;
    --container-padding: 20px;

    --transition-speed: 0.3s;
    --border-radius: 8px;
}

/* ===== リセットと基本スタイル ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family-base);
    line-height: var(--line-height-base);
    color: var(--dark-color);
    background-color: var(--white-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: var(--container-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

.page-section {
    padding: 5rem 0;
}
.bg-light {
    background-color: var(--light-gray-color);
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
}
.section-title-left {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: left;
    margin-bottom: 1.5rem;
}

.section-lead {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 3rem;
    text-align: center;
    color: var(--gray-color);
}

/* ===== ボタン ===== */
.btn {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white-color);
    border: 2px solid var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-hover-color);
    color: var(--white-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* ===== ヘッダー ===== */
.header {
    background-color: rgba(255, 255, 255, 0.95);
    padding: 0.8rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    backdrop-filter: blur(5px);
}

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

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.logo:hover { color: var(--dark-color); }
.logo-image {
    height: 40px;
    width: 40px;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link:not(.btn) {
    font-weight: 500;
    color: var(--gray-color);
    padding: 0.5rem 0;
}
.nav-link:not(.btn):hover {
    color: var(--primary-color);
}

.nav-toggle { display: none; background: none; border: none; cursor: pointer; z-index: 1001; }
.hamburger { display: block; width: 25px; height: 2px; background-color: var(--dark-color); position: relative; transition: background-color 0s 0.3s; }
.hamburger::before, .hamburger::after { content: ''; position: absolute; width: 100%; height: 2px; background-color: var(--dark-color); left: 0; transition: transform var(--transition-speed) ease; }
.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

/* ===== ヒーローセクション ===== */
.hero {
    background-color: var(--dark-color);
    color: var(--white-color);
    text-align: center;
    padding: 5rem 0;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;
}

/* ===== お知らせバナー ===== */
.announcement-banner {
    background-color: var(--primary-hover-color);
    color: var(--white-color);
    text-align: center;
    padding: 1.2rem var(--container-padding);
}
.announcement-banner p {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 500;
}
.announcement-banner i {
    margin-right: 0.75rem;
}


/* ===== 特徴・カード系 ===== */
.features-grid, .officer-grid, .regions-grid, .kamon-grid, .kaiho-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card, .officer-card, .region-card, .kamon-card {
    background-color: var(--white-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
.feature-card:hover, .officer-card:hover, .region-card:hover, .kamon-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.07);
}
.feature-icon { font-size: 2.5rem; color: var(--primary-color); margin-bottom: 1rem; }
.feature-title { font-size: 1.4rem; margin-bottom: 0.5rem; }

/* ===== 詳細・リスト系 ===== */
.about-container { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 3rem; }
.detail-list { list-style: none; padding: 0; }
.detail-list li a {
    display: block;
    padding: 1rem;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-speed);
}
.detail-list li a:hover {
    background-color: var(--white-color);
    color: var(--primary-hover-color);
}
.detail-list li:first-child a { border-top: 1px solid var(--border-color); }
.detail-list i { float: right; }

/* ===== 画像関連 ===== */
.image-container {
    margin: 2rem 0;
    text-align: center;
}
.image-container img {
    max-width: 500px;
    width: 100%;
    border-radius: var(--border-radius);
    margin: 0 auto;
}
.image-credit {
    font-size: 0.8rem;
    color: var(--gray-color);
    margin-top: 0.5rem;
}
.kamon-card img {
    width: 200px;
    height: 200px;
    max-width: 100%;
    object-fit: contain;
    margin: 0 auto 1rem;
}

/* ===== スライドショー関連 ===== */
.slideshow-container {
    position: relative;
    max-width: 600px;
    aspect-ratio: 3 / 2;
    margin: 0 auto;
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: var(--border-color);
}

.slideshow-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.slideshow-image.active {
    opacity: 1;
}


/* ===== 入会案内セクション ===== */
.contact { background-color: var(--primary-color); color: var(--white-color); text-align: center; padding: 4rem 0; }
.contact p { max-width: 600px; margin: 0 auto 2rem; opacity: 0.9; }

/* ===== フォーム関連 ★ここから追加・修正★ ===== */
.form-container {
    max-width: 600px;
    margin: 2rem auto 0;
    text-align: left;
}
.form-group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 1.5rem;
}
.form-group label {
    flex: 0 0 120px;
    padding-right: 1rem;
    font-weight: 500;
    text-align: right;
    color: var(--white-color);
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    flex: 1 1 auto;
    width: auto;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: var(--font-family-base);
    background-color: #fdfdfd;
    color: var(--dark-color);
}
.form-group textarea {
    resize: vertical;
}
.form-container button[type="submit"] {
    display: block;
    margin: 1rem auto 0;
    border-color: var(--white-color);
    background-color: transparent;
}
.form-container button[type="submit"]:hover {
    background-color: var(--white-color);
    color: var(--primary-color);
}
/* ===== フォーム関連 ★ここまで★ ===== */


/* ===== フッター ===== */
.footer { 
    background-color: var(--dark-color); 
    color: var(--light-gray-color); 
    padding: 2rem 0; 
    font-size: 0.9rem; 
}

.footer-container { 
    display: flex; 
    flex-direction: column;
    gap: 1rem;
}

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

.footer-nav a { 
    color: var(--light-gray-color); 
    opacity: 0.8; 
}
.footer-nav a:hover { 
    opacity: 1; 
}

/* ===== ソーシャルメディアリンク ===== */
.social-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--light-gray-color);
    font-size: 1.2rem;
    transition: all var(--transition-speed) ease;
    opacity: 0.8;
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: var(--white-color);
    opacity: 1;
    transform: translateY(-2px);
}

.social-links a[href*="facebook"]:hover {
    background-color: #1877f2;
}

.social-links a[href*="instagram"]:hover {
    background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}

/* ===== レスポンシブデザイン (モバイル) ===== */
@media (max-width: 768px) {
    html { font-size: 15px; }
    .section-title, .section-title-left { font-size: 1.8rem; }
    .hero-title { font-size: 2.2rem; }

    .nav-main { position: fixed; top: 0; right: -100%; width: 80%; height: 100vh; background-color: var(--white-color); box-shadow: -5px 0 15px rgba(0,0,0,0.1); transition: right var(--transition-speed) ease; padding-top: 6rem; }
    .nav-main.is-active { right: 0; }
    .nav-list { flex-direction: column; align-items: center; gap: 1.5rem; }
    .nav-link.btn { padding: 0.8rem 2rem; }
    .nav-toggle { display: block; }
    .nav-toggle.is-active .hamburger { background-color: transparent; }
    .nav-toggle.is-active .hamburger::before { transform: rotate(45deg) translate(5px, 6px); }
    .nav-toggle.is-active .hamburger::after { transform: rotate(-45deg) translate(5px, -6px); }

    .about-container { grid-template-columns: 1fr; text-align: center; }
    .about-content .section-title-left { text-align: center; }
    
    .footer-content { 
        flex-direction: column; 
        gap: 1rem; 
        text-align: center;
    }

    /* フォームのモバイル対応 */
    .form-group {
        flex-direction: column;
        align-items: flex-start;
    }
    .form-group label {
        text-align: left;
        margin-bottom: 0.5rem;
        flex-basis: auto;
    }
}