/* ==============================
   変数定義とベーススタイル
   ============================== */
:root {
    /* カラー変数 */
    --color-primary: #131629; /* ダークネイビー */
    --color-secondary: #181c2e; /* ダークグレー */
    --color-accent: #7fd7f8; /* エレクトリックブルー */
    --color-accent-dark: #667eea; /* 強めのブルー */
    --color-accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%); /* グラデーション */
    --color-success: #00d4aa; /* 緑（チェックマークなど） */
    --color-text: #333333; /* 標準テキスト色 */
    --color-text-light: #ffffff; /* 明るいテキスト色 */
    --color-text-muted: #666666; /* 弱めのテキスト色 */
    --color-bg-light: #f8f9fa; /* 明るい背景色 */
    --color-bg-dark: #2c3e50; /* 暗い背景色 */
    --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 20px 60px rgba(0, 0, 0, 0.15);
    --border-radius: 15px;
    --transition: all 0.3s ease;
    --font-primary: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    --font-secondary: 'Montserrat', sans-serif;
}

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

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-text);
    background-color: #ffffff;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-padding {
    padding: 6rem 0;
}

.section-dark {
    background: var(--color-primary);
    color: var(--color-text-light);
    position: relative;
}

.section-dark::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* 微妙な背景パターン */
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34h-2v-2h2v2zm0-8h-2v2h2v-2zm-8 8h-2v-2h2v2zm8-12h-2v2h2v-2zm-8 4h-2v2h2v-2zm8 8h-2v2h2v-2zm-8-8h-2v2h2v-2zm0 8h-2v2h2v-2z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
    z-index: 0;
}

.section-dark > * {
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-secondary);
}

.section-title i {
    font-size: 3rem;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
}

/* ==============================
   ヘッダー
   ============================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    font-family: var(--font-secondary);
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 2rem;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-desktop ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-desktop ul li a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 25px;
}

.nav-desktop ul li a:hover {
    color: var(--color-accent-dark);
    background-color: rgba(127, 215, 248, 0.1);
    transform: translateY(-2px);
}

.header-contact {
    display: flex;
    align-items: center;
}

.contact-email {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--color-text-light);
    font-weight: 500;
    padding: 0.6rem 1.2rem;
    background: var(--color-accent-gradient);
    border-radius: 25px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.contact-email::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.contact-email:hover::before {
    left: 100%;
}

.contact-email:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.nav-mobile {
    display: none;
}

/* ==============================
   ヒーローセクション（ヘッダー画像対応）
   ============================== */
.hero {
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    color: var(--color-text-light);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('img/header.png') no-repeat center center;
    background-size: cover;
    z-index: -2;
    transition: transform 0.3s ease-out;
    will-change: transform;
}

/* フォールバック背景（画像が読み込めない場合） */
.hero-background.fallback {
    background: var(--color-accent-gradient);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* テキストの視認性を向上させるオーバーレイ */
    background: linear-gradient(
        135deg,
        rgba(19, 22, 41, 0.6) 0%,
        rgba(102, 126, 234, 0.3) 50%,
        rgba(118, 75, 162, 0.4) 100%
    );
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
    background: rgba(19, 22, 41, 0.2);
    backdrop-filter: blur(5px);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-left: 2rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    margin-bottom: 2rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    font-family: var(--font-secondary);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.3);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

/* ==============================
   ボタンスタイル
   ============================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary:hover {
    background-color: #6ac5e4;
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.btn-outline {
    border: 2px solid var(--color-text-light);
    color: var(--color-text-light);
    background: transparent;
}

.btn-outline:hover {
    background-color: var(--color-text-light);
    color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: var(--color-accent-gradient);
    color: var(--color-text-light);
}

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

/* ==============================
   アニメーション
   ============================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeIn 1s forwards;
}

.delay-1 { animation-delay: 0.3s; }
.delay-2 { animation-delay: 0.6s; }
.delay-3 { animation-delay: 0.9s; }

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

/* ==============================
   企業情報セクション
   ============================== */
.company-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.info-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(127, 215, 248, 0.1);
}

.info-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-accent-gradient);
}

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

.info-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: var(--color-accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-medium);
    position: relative;
}

.info-icon::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    background: var(--color-accent-gradient);
    border-radius: 50%;
    z-index: -1;
    opacity: 0.3;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.1; }
}

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

.info-card h3 {
    color: var(--color-accent-dark);
    margin-bottom: 1rem;
    font-size: 1.4rem;
    font-weight: 600;
}

.info-card a {
    color: var(--color-accent-dark);
    text-decoration: none;
    transition: var(--transition);
}

.info-card a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* 企業ビジョン */
.company-vision {
    margin-top: 4rem;
}

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

.vision-item {
    text-align: center;
    padding: 2rem;
    background: rgba(127, 215, 248, 0.05);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.vision-item:hover {
    transform: translateY(-5px);
    background: rgba(127, 215, 248, 0.1);
}

.vision-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: var(--color-accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.vision-icon i {
    font-size: 1.8rem;
    color: white;
}

.vision-item h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--color-accent-dark);
    font-weight: 600;
}

.vision-item p {
    line-height: 1.7;
    color: var(--color-text-muted);
}

/* ==============================
   事業内容セクション（4つ対応）
   ============================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.service-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-accent-gradient);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
    background: rgba(255, 255, 255, 0.08);
}

.service-number {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 3rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.1);
    font-family: var(--font-secondary);
}

.service-icon {
    position: relative;
    width: 80px;
    height: 80px;
    margin-bottom: 1.5rem;
    background: var(--color-accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-icon i {
    font-size: 2.5rem;
    color: white;
}

.service-card h3 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
    color: var(--color-accent);
    font-weight: 600;
}

.service-card p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
    opacity: 0.9;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.95rem;
}

.feature-item i {
    color: var(--color-success);
    font-size: 1.2rem;
}

/* ==============================
   プロダクトセクション
   ============================== */
.products-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

.product-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
}

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

.product-content {
    padding: 2.5rem;
}

.product-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.product-icon {
    width: 50px;
    height: 50px;
    background: var(--color-accent-gradient);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-light);
}

.product-icon i {
    font-size: 1.8rem;
    color: white;
}

.product-badge {
    background: var(--color-accent-gradient);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.product-card h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
    font-weight: 700;
}

.product-card h4 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: var(--color-accent-dark);
    font-weight: 400;
}

.product-card p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
    color: var(--color-text);
}

.product-section {
    margin-bottom: 1.5rem;
    padding: 1.2rem;
    background: rgba(127, 215, 248, 0.05);
    border-radius: 10px;
    border-left: 4px solid var(--color-accent);
}

.highlight-section {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-left: 4px solid var(--color-accent-dark);
    position: relative;
}

.highlight-section::before {
    content: '★';
    position: absolute;
    top: 1rem;
    right: 1rem;
    color: var(--color-accent-dark);
    font-size: 1.5rem;
    opacity: 0.3;
}

.product-section h5 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.welfare-description {
    font-style: italic;
    color: var(--color-accent-dark);
    margin-bottom: 1rem;
    font-weight: 500;
    padding: 1rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 8px;
    border-left: 3px solid var(--color-accent-dark);
}

.product-features {
    margin: 1rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    list-style: none;
    padding-left: 0;
}

.product-features li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.product-features li i {
    color: var(--color-success);
    font-size: 1.2rem;
}

.welfare-benefits {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.9rem;
    color: var(--color-accent-dark);
    font-weight: 500;
}

.benefit-item i {
    color: var(--color-success);
    font-size: 1rem;
}

.system-features {
    margin: 1.5rem 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.feature-box {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem;
    background: rgba(127, 215, 248, 0.1);
    border-radius: 10px;
    transition: var(--transition);
}

.feature-box:hover {
    background: rgba(127, 215, 248, 0.2);
    transform: translateY(-2px);
}

.feature-box i {
    font-size: 1.5rem;
    color: var(--color-accent-dark);
}

.feature-box span {
    font-weight: 500;
    color: var(--color-primary);
}

.product-image {
    background: var(--color-accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-visual {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
}

.product-visual i {
    font-size: 3.5rem;
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.product-card:hover .product-visual i {
    color: white;
    transform: scale(1.1);
}

/* ==============================
   フッター
   ============================== */
.footer {
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-primary) 100%);
    color: var(--color-text-light);
    padding: 4rem 0 2rem;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* 背景パターン */
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34h-2v-2h2v2zm0-8h-2v2h2v-2zm-8 8h-2v-2h2v2zm8-12h-2v2h2v-2zm-8 4h-2v2h2v-2zm8 8h-2v2h2v-2zm-8-8h-2v2h2v-2zm0 8h-2v2h2v-2z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.1;
    z-index: 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
    position: relative;
    z-index: 2;
}

.footer-info {
    max-width: 400px;
}

.footer-info .logo {
    margin-bottom: 1.5rem;
}

.footer-info p {
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.7;
}

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

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-item i {
    font-size: 1.2rem;
    color: var(--color-accent);
    margin-top: 0.2rem;
}

.contact-item a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: white;
}

.footer-links h4 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.footer-links ul li {
    margin-bottom: 1rem;
}

.footer-links ul li a {
    text-decoration: none;
    color: var(--color-text-light);
    opacity: 0.8;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-links ul li a:hover {
    opacity: 1;
    color: var(--color-accent);
    transform: translateX(5px);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
    position: relative;
    z-index: 2;
}

/* スクロールトップボタン */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--color-accent-gradient);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    box-shadow: var(--shadow-medium);
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

/* ==============================
   モバイルナビゲーション
   ============================== */
.mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--color-primary);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateX(-100%);
    transition: transform 0.4s ease;
}

.mobile-nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-accent-gradient);
    opacity: 0.1;
}

.mobile-nav.active {
    transform: translateX(0);
}

.mobile-nav ul {
    list-style: none;
    text-align: center;
    position: relative;
    z-index: 2;
}

.mobile-nav ul li {
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.3s ease;
}

.mobile-nav.active ul li {
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav ul li:nth-child(1) { transition-delay: 0.1s; }
.mobile-nav ul li:nth-child(2) { transition-delay: 0.2s; }
.mobile-nav ul li:nth-child(3) { transition-delay: 0.3s; }
.mobile-nav ul li:nth-child(4) { transition-delay: 0.4s; }
.mobile-nav ul li:nth-child(5) { transition-delay: 0.5s; }

.mobile-nav ul li a {
    color: var(--color-text-light);
    font-size: 1.5rem;
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1rem 2rem;
    border-radius: 50px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-nav ul li a:hover {
    color: var(--color-accent);
    background: rgba(127, 215, 248, 0.1);
    transform: scale(1.05);
}

.hamburger {
    display: block;
    width: 30px;
    height: 3px;
    background-color: var(--color-text);
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 3px;
    background-color: var(--color-text);
    transition: all 0.3s ease;
}

.hamburger::before {
    transform: translateY(-10px);
}

.hamburger::after {
    transform: translateY(10px);
}

.hamburger.active {
    background-color: transparent;
}

.hamburger.active::before {
    transform: rotate(45deg);
}

.hamburger.active::after {
    transform: rotate(-45deg);
}

.no-scroll {
    overflow: hidden;
}

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

.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ==============================
   レスポンシブデザイン
   ============================== */
@media (max-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .product-card {
        grid-template-columns: 1fr;
    }
    
    .product-image {
        min-height: 250px;
        order: -1;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-content {
        margin-left: 0;
        max-width: 100%;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-desktop,
    .header-contact {
        display: none;
    }
    
    .nav-mobile {
        display: block;
    }
    
    .hero-content {
        padding: 1.5rem;
        background: rgba(19, 22, 41, 0.4);
    }
    
    .hero h1 {
        font-size: 2.8rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .vision-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-content {
        padding: 1.2rem;
        background: rgba(19, 22, 41, 0.5);
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .product-content {
        padding: 2rem;
    }
    
    .service-card {
        padding: 2rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .section-padding {
        padding: 4rem 0;
    }
}

/* ==============================
   アクセシビリティ対応
   ============================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .hero-background {
        transform: none !important;
    }
}

.btn:focus,
.contact-email:focus,
.nav-desktop a:focus,
.mobile-nav a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}