/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-size: 16px;
}

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

/* Header and Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

nav {
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.9rem;
    transition: var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--secondary-color);
    transition: var(--transition);
}

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

.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: 8rem 0 6rem;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    letter-spacing: -1px;
    line-height: 1.2;
}

.hero .subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-weight: 300;
}

.hero .description {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
}

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

.btn {
    padding: 0.875rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
    display: inline-block;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #1a252f;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Features Section */
.features {
    padding: 6rem 0;
    background-color: var(--bg-color);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    font-weight: 600;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    padding: 2.5rem 2rem;
    background-color: var(--bg-light);
    border-radius: 12px;
    transition: var(--transition);
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--border-color);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Tutorial Section */
.tutorial {
    padding: 6rem 0;
    background-color: var(--bg-light);
}

.tutorial h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    font-weight: 600;
}

.tutorial-steps {
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
}

.step-content p {
    color: var(--text-light);
    line-height: 1.7;
}

/* FAQ Section */
.faq {
    padding: 6rem 0;
    background-color: var(--bg-color);
}

.faq h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    font-weight: 600;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--bg-color);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background-color: var(--bg-light);
}

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

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* Contact Section */
.contact {
    padding: 6rem 0;
    background-color: var(--bg-light);
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-weight: 600;
}

.contact-description {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 4rem;
    font-size: 1.1rem;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    padding: 2.5rem 2rem;
    background-color: var(--bg-color);
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
}

.contact-card p {
    color: var(--text-light);
}

.contact-card a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: 4rem 0 2rem;
}

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

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

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

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* Legal Pages */
.legal-page {
    margin-top: 80px;
    padding: 4rem 0;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

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

.legal-page .last-updated {
    color: var(--text-light);
    margin-bottom: 3rem;
    font-style: italic;
}

.legal-page h2 {
    font-size: 1.75rem;
    margin-top: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.legal-page h3 {
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.legal-page p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.legal-page ul {
    margin-bottom: 1rem;
    margin-left: 2rem;
    line-height: 1.8;
}

.legal-page li {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.legal-page a {
    color: var(--secondary-color);
    text-decoration: none;
}

.legal-page a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: 1rem 0;
        box-shadow: var(--shadow);
        gap: 0;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
        padding: 0.75rem 0;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: 4rem 0 3rem;
    }

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

    .hero .subtitle {
        font-size: 1.25rem;
    }

    .features h2,
    .tutorial h2,
    .faq h2,
    .contact h2 {
        font-size: 2rem;
    }

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

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .container {
        padding: 0 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}