/* ===============================
   CSS Variables & Reset
   =============================== */

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
}

/* ===============================
   Header & Navigation
   =============================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
}

.logo {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    line-height: 1;
}

.logo img {
    height: 32px;
    width: auto;
    transition: var(--transition);
}

.logo i {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
    margin: 0;
    padding: 0;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    line-height: 1;
}

.nav-menu a i {
    font-size: 0.85rem;
}

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

.contact-link {
    background: var(--secondary-color);
    color: var(--white) !important;
    padding: 0.4rem 0.9rem;
    border-radius: 5px;
    transition: var(--transition);
    font-size: 0.9rem;
    line-height: 1;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.contact-link i {
    font-size: 0.85rem;
}

.contact-link:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

/* ===============================
   Hero Section
   =============================== */

.hero {
    height: 100vh;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding: 0 1rem;
    position: relative;
}

.hero-content {
    max-width: 1100px;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.cta-button.primary {
    background: var(--white);
    color: var(--primary-color);
}

.cta-button.secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 49%;
    right: 49%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--white);
    opacity: 0.7;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* ===============================
   Common Sections & Layout
   =============================== */

.section {
    padding: 6rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-subtitle {
    color: #666;
    font-size: 1.1rem;
}

/* ===============================
   Concept Section
   =============================== */

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

.concept-item {
    text-align: center;
    padding: 2.5rem;
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.concept-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.concept-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--light-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.concept-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.learn-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--secondary-color);
    text-decoration: none;
    margin-top: 1rem;
    font-weight: 500;
    transition: var(--transition);
}

.learn-more:hover {
    gap: 0.8rem;
}

/* ===============================
   Services Section
   =============================== */

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

.service-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    width: 60px;
    height: 60px;
    background: var(--light-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon i {
    font-size: 1.5rem;
    color: var(--secondary-color);
}

.service-card h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.service-card ul {
    list-style: none;
}

.service-card li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.service-card li i {
    color: var(--secondary-color);
}

.service-link {
    color: #007bff;
    font-weight: bold;
    text-decoration: none;
    transition: color 0.3s ease;
}

.service-link:hover {
    color: #0056b3;
}

.service-link::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: var(--secondary-color);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.service-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* ===============================
   Target Section
   =============================== */

.target-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    text-align: center;
}

.target-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.target-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.target-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: var(--light-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.target-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.target-item p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===============================
   Topics Section
   =============================== */

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

.topic-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.topic-date {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.topic-card h3 {
    margin-bottom: 1rem;
    line-height: 1.4;
}

.topic-card h3 a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.topic-card h3 a:hover {
    color: var(--secondary-color);
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.read-more:hover {
    gap: 0.8rem;
}

/* ===============================
   Contact Form
   =============================== */

.contact-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--white);
    padding: 3rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
}

.contact-form {
    display: grid;
    gap: 1.5rem;
}

.form-group {
    display: grid;
    gap: 0.5rem;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    height: 150px;
    resize: vertical;
}

.submit-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--secondary-color);
    color: var(--white);
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.submit-button:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

/* ===============================
   Footer
   =============================== */

.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 4rem 1rem 1rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.footer-logo i {
    color: var(--secondary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    color: var(--white);
    font-size: 1.2rem;
    transition: var(--transition);
}

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

.footer-links h4,
.footer-contact h4 {
    color: var(--white);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.footer-contact p i {
    color: var(--white);
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.footer-contact p a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    padding-bottom: 2px;
}

.footer-contact p a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: 0;
    left: 0;
    background-color: var(--white);
    transition: var(--transition);
}

.footer-contact p a:hover {
    color: var(--white);
    opacity: 0.8;
}

.footer-contact p a:hover::after {
    width: 100%;
}

.footer-contact p:hover {
    transform: translateX(5px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* ===============================
   Responsive Design
   =============================== */

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--white);
        padding: 1rem;
        box-shadow: var(--shadow-md);
    }

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

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .section {
        padding: 4rem 1rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .contact-container {
        padding: 2rem 1rem;
    }

    .logo {
        font-size: 1rem;
    }

    .logo img {
        height: 28px;
    }

    .nav-container {
        padding: 0.6rem 1rem;
        gap: 1.5rem;
    }
}

/* ===============================
   Special Pages & Components
   =============================== */

/* Terms & Privacy Pages */
.terms-content,
.privacy-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
}

.terms-content h2,
.privacy-content h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.terms-content h2:first-child,
.privacy-content h2:first-child {
    margin-top: 0;
}

.terms-content p,
.privacy-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.terms-content ul,
.privacy-content ul {
    list-style: disc;
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.terms-content ul li,
.privacy-content ul li {
    position: relative;
    margin-bottom: 0.8rem;
    padding-left: 0;
}

.terms-content ul li i,
.privacy-content ul li i {
    color: var(--primary-color);
    font-size: 0.9rem;
}

/* 404 Error Page Styles */
.error-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 200px);
    padding: 4rem 1rem;
    text-align: center;
    background: var(--light-bg);
}

.error-code {
    font-size: 8rem;
    font-weight: bold;
    color: var(--secondary-color);
    line-height: 1;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.error-message {
    margin-bottom: 2rem;
}

.error-message p {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.home-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--secondary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.home-button:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.home-button i {
    font-size: 1rem;
}

/* Special Section Styles */
.section {
    padding: 8rem 1rem 4rem;
    background: var(--light-bg);
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-subtitle {
    color: var(--text-color);
    opacity: 0.8;
}

/* Advertisement Banner */
.advertisement-banner {
    width: 762px;
    margin: auto;
    padding: auto;
    text-align: center;
}

/* Mobile Styles for Special Pages */
@media (max-width: 768px) {
    .terms-content,
    .privacy-content {
        padding: 1.5rem;
        margin: 0 1rem;
    }

    .section-header h1 {
        font-size: 2rem;
    }

    .terms-content h2,
    .privacy-content h2 {
        font-size: 1.3rem;
    }

    .advertisement-banner {
        width: 300px;
        margin: auto;
        text-align: center;
    }

    .error-code {
        font-size: 5rem;
    }

    .error-message p {
        font-size: 1rem;
    }

    .home-button {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
}