/* ヘッダー */
header {
    background: var(--bg-white);
    color: var(--text-color);
    padding: var(--spacing-md) 0;
    position: fixed;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

header.scrolled {
    padding: 5px 0;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: var(--font-md);
    font-weight: bold;
    display: flex;
    align-items: center;
}

.logo img {
    height: 75px;
    width: auto;
    margin-right: var(--spacing-sm);
    transition: var(--transition);
}

header.scrolled .logo img {
    height: 65px;
}

.logo span {
    color: white;
}

.nav-toggle {
    display: none;
    cursor: pointer;
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-menu li {
    margin-left: var(--spacing-xl);
}

.nav-menu a {
    color: var(--text-color);
    transition: var(--transition);
    position: relative;
    padding: 5px 0;
}

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

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

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

.nav-menu .contact-link a {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 20px;
    border-radius: 5px;
    transition: var(--transition);
}

.nav-menu .contact-link a:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

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

/* ヒーローセクション */
.hero {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    text-align: center;
    padding: 180px 0 100px;
    background-size: cover;
    background-position: center;
    position: relative;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero p {
    font-size: var(--font-sm);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

/* フッター */
footer {
    background-color: var(--bg-dark);
    color: white;
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.company-info {
    margin-bottom: var(--spacing-lg);
}

.company-info p {
    margin-bottom: var(--spacing-xs);
}

.copyright {
    margin-top: var(--spacing-lg);
    color: #aaa;
    font-size: var(--font-xxs);
}

/* コンタクトセクション */
.contact {
    text-align: center;
    background: linear-gradient(90deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: white;
    padding: var(--spacing-section) 0;
}

.contact .section-title h2 {
    color: white;
    font-size: var(--font-lg);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.contact .section-title p {
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    font-size: var(--font-sm);
    color: white;
    opacity: 1;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: 500;
    background-color: rgba(0, 0, 0, 0.3);
    padding: 12px 20px;
    border-radius: 5px;
    display: inline-block;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.2);
}

.contact .btn {
    background-color: white;
    color: var(--primary-dark);
    font-size: var(--font-sm);
    padding: 15px 40px;
    border: 2px solid white;
}

.contact .btn:hover {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

/* About AI section */
.about-ai p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 2rem 0;
}

/* AI Evolution Timeline */
.ai-evolution {
    margin: 3rem 0;
    text-align: center;
}

.ai-evolution h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.ai-evolution-timeline {
    display: flex;
    justify-content: space-between;
    margin: 2.5rem 0;
    position: relative;
}

.ai-evolution-timeline::before {
    content: '';
    position: absolute;
    top: 50px;
    left: 10%;
    width: 80%;
    height: 4px;
    background: var(--gradient-color);
    z-index: 0;
}

.timeline-item {
    flex: 1;
    text-align: center;
    padding: 0 1rem;
    position: relative;
    z-index: 1;
}

.timeline-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: var(--light-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.timeline-icon i {
    font-size: 2rem;
    color: var(--primary-color);
}

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

.timeline-item p {
    font-size: 1rem;
    color: var(--text-color);
    line-height: 1.5;
}

.timeline-item:hover .timeline-icon {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(var(--primary-rgb), 0.2);
}

/* Multi-Agent Section */
.multi-agent {
    margin: 4rem 0 2rem;
    text-align: center;
}

.multi-agent h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.multi-agent-image {
    margin: 2rem auto;
    max-width: 800px;
}

.multi-agent-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.feature {
    background-color: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}