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

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* ヘッダー */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
}

.nav-brand i {
    margin-right: 0.5rem;
    font-size: 1.8rem;
}

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

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: #667eea;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #667eea;
    transition: width 0.3s ease;
}

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

/* ヒーローセクション */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 100vh;
    padding: 100px 2rem 2rem;
    color: white;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.cta-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cta-button i {
    margin-right: 0.5rem;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-icon {
    font-size: 15rem;
    opacity: 0.3;
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* セクション共通 */
.section {
    padding: 5rem 0;
    background: white;
}

.section:nth-child(even) {
    background: #f8f9fa;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #333;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

/* 概要セクション */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.overview-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #f0f0f0;
}

.overview-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.card-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.overview-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #333;
}

.overview-card p {
    color: #666;
    line-height: 1.6;
}

/* 特徴セクション */
.features-content {
    max-width: 900px;
    margin: 0 auto;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 3rem;
    padding: 2rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateX(10px);
}

.feature-number {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    margin-right: 2rem;
    flex-shrink: 0;
}

.feature-text h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #333;
}

.feature-text p {
    color: #666;
    line-height: 1.7;
}

/* フローセクション */
.flow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 3rem;
}

.flow-step {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    min-width: 250px;
}

.flow-step:hover {
    transform: translateY(-10px);
}

.step-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 2rem;
}

.flow-step h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #333;
}

.flow-step p {
    color: #666;
    font-size: 0.9rem;
}

.flow-arrow {
    font-size: 2rem;
    color: #667eea;
    margin: 0 1rem;
}

/* ガイドラインセクション */
.guidelines-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.guideline-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.guideline-card:hover {
    transform: translateY(-5px);
}

.card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    display: flex;
    align-items: center;
}

.card-header i {
    font-size: 1.5rem;
    margin-right: 1rem;
}

.card-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

.card-content {
    padding: 2rem;
}

.card-content p {
    margin-bottom: 1rem;
    line-height: 1.6;
    color: #666;
}

.card-content p:last-child {
    margin-bottom: 0;
}

.important {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 5px;
    font-weight: 500;
    color: #856404;
}

/* コンタクトセクション */
.contact {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.contact-content p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem 2rem;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-item i {
    margin-right: 0.5rem;
    font-size: 1.2rem;
}

/* フッター */
.footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* モバイルメニュートグル */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #667eea;
    cursor: pointer;
    padding: 0.5rem;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav {
        padding: 1rem;
        flex-direction: row;
        justify-content: space-between;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        margin: 0.5rem 0;
    }

    .nav-menu {
        gap: 1rem;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        padding: 120px 1rem 2rem;
    }

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

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-icon {
        font-size: 8rem;
        margin-top: 2rem;
    }

    .overview-grid {
        grid-template-columns: 1fr;
    }

    .feature-item {
        flex-direction: column;
        text-align: center;
    }

    .feature-number {
        margin: 0 auto 1rem;
    }

    .flow-steps {
        flex-direction: column;
    }

    .flow-arrow {
        transform: rotate(90deg);
    }

    .guidelines-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

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

    .overview-card,
    .guideline-card {
        padding: 1.5rem;
    }
}