:root {
    --bg-color: #FDF9F0;
    --text-color: #4A4A4A;
    --accent-color: #FF9B7F;
    --secondary-color: #FFD4C4;
    --font-family: "Inter", "Noto Sans JP", sans-serif;
    --spacing-unit: 1rem;
    --border-radius: 24px;
    --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.04);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.3s ease;
}

a:hover {
    opacity: 0.7;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 140px 0 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: 30px;
    box-shadow: var(--shadow-soft);
    margin-bottom: 16px;
    animation: float 6s ease-in-out infinite;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #666, #333);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: #888;
    font-weight: 400;
}

.store-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 32px;
}

.store-btn {
    background: #333;
    color: #fff;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Features Section */
.features {
    padding: 120px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 48px;
}

.feature-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 48px 40px;
    text-align: center;
    box-shadow: var(--shadow-soft);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.06);
}

.feature-card img {
    max-width: 100%;
    height: auto;
    border-radius: 16px;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #555;
}

/* Screenshots Section */
.screenshots {
    padding: 120px 0;
    background-color: #FFFBF5;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-header p {
    color: #888;
    font-size: 1.1rem;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 40px;
    justify-items: center;
}

.screenshots-grid img {
    width: 100%;
    max-width: 300px;
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.screenshots-grid img:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
}

/* Concept Section */
.concept {
    padding: 120px 0;
    text-align: center;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(255, 155, 127, 0.03) 100%);
}

.concept-content {
    max-width: 600px;
    margin: 0 auto;
}

.concept p {
    font-size: 1.1rem;
    margin-bottom: 24px;
    color: #666;
}

.concept strong {
    font-size: 1.4rem;
    font-weight: 700;
    color: #333;
    display: block;
    margin-top: 16px;
}

/* Footer */
footer {
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid #f0f0f0;
    font-size: 0.9rem;
    color: #999;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 24px;
}

.footer-links a {
    color: #666;
}

/* Animations */
@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }

    100% {
        transform: translateY(0px);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

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

    .pc-only {
        display: none;
    }
}

/* Use Cases Section */
.use-cases {
    padding: 120px 0;
    background-color: #fff;
}

.use-cases-list {
    display: flex;
    flex-direction: column;
    gap: 48px;
    max-width: 800px;
    margin: 0 auto;
}

.use-case-item {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    padding: 40px;
    border-radius: var(--border-radius);
    background: #FFFBF5;
    border: 1px solid #F5EDE0;
    transition: transform 0.3s ease;
}

.use-case-item:hover {
    transform: translateX(10px);
    border-color: var(--accent-color);
}

.use-case-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    opacity: 0.3;
    line-height: 1;
    font-family: var(--font-family);
}

.use-case-content h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: #333;
}

.use-case-content p {
    color: #666;
    line-height: 1.8;
}

/* Benefits Section */
.benefits {
    padding: 120px 0;
    background-color: #FDF6EB;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.benefit-card {
    background: #fff;
    padding: 48px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.benefit-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.06);
}

.benefit-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-color), var(--secondary-color));
}

.benefit-card h3 {
    font-size: 1.3rem;
    margin-bottom: 16px;
    color: #333;
    line-height: 1.4;
}

.benefit-card p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.7;
}

/* CTA Section */
.cta {
    padding: 140px 0;
    text-align: center;
    background: linear-gradient(135deg, #FFFBF5 0%, #FDF6EB 100%);
}

.cta h2 {
    font-size: 2.2rem;
    margin-bottom: 16px;
    color: #333;
}

.cta p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 40px;
}

.cta .store-buttons {
    justify-content: center;
}

/* Responsive adjustments for new sections */
@media (max-width: 768px) {
    .use-case-item {
        flex-direction: column;
        gap: 16px;
        padding: 24px;
    }

    .use-case-number {
        font-size: 2.5rem;
    }

    .cta h2 {
        font-size: 1.8rem;
    }
}

/* Intro Section */
.intro {
    padding: 100px 0;
    text-align: center;
    background-color: #fff;
}

.intro h2 {
    font-size: 1.8rem;
    margin-bottom: 24px;
    color: #333;
}

.intro-text {
    font-size: 1.1rem;
    color: #666;
    line-height: 2;
}

/* Brand Core Section */
.brand-core {
    padding: 100px 0;
    background-color: #fff;
}

.brand-core-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}

.core-item {
    padding: 24px;
    border-left: 4px solid var(--accent-color);
    background: #fcfcfc;
}

.core-item h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: #333;
}

.core-item p {
    color: #666;
    font-size: 1rem;
}

/* Philosophy Section */
.philosophy {
    padding: 120px 0;
    text-align: center;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(255, 155, 127, 0.05) 100%);
}

.philosophy-content {
    max-width: 700px;
    margin: 0 auto;
}

.philosophy h2 {
    font-size: 1.6rem;
    margin-bottom: 32px;
    color: #333;
    line-height: 1.5;
}

.philosophy p {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: #666;
}

.philosophy strong {
    font-size: 1.4rem;
    font-weight: 700;
    color: #333;
    display: block;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid #eee;
}

/* Scroll Animation */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delays for grid items */
.features-grid .feature-card:nth-child(1) {
    transition-delay: 0.1s;
}

.features-grid .feature-card:nth-child(2) {
    transition-delay: 0.2s;
}

.features-grid .feature-card:nth-child(3) {
    transition-delay: 0.3s;
}

.features-grid .feature-card:nth-child(4) {
    transition-delay: 0.4s;
}

.features-grid .feature-card:nth-child(5) {
    transition-delay: 0.5s;
}

.use-cases-list .use-case-item:nth-child(1) {
    transition-delay: 0.1s;
}

.use-cases-list .use-case-item:nth-child(2) {
    transition-delay: 0.2s;
}

.use-cases-list .use-case-item:nth-child(3) {
    transition-delay: 0.3s;
}

.benefits-grid .benefit-card:nth-child(1) {
    transition-delay: 0.1s;
}

.benefits-grid .benefit-card:nth-child(2) {
    transition-delay: 0.2s;
}

.benefits-grid .benefit-card:nth-child(3) {
    transition-delay: 0.3s;
}

.benefits-grid .benefit-card:nth-child(4) {
    transition-delay: 0.4s;
}

.benefits-grid .benefit-card:nth-child(5) {
    transition-delay: 0.5s;
}

.brand-core-list .core-item:nth-child(1) {
    transition-delay: 0.1s;
}

.brand-core-list .core-item:nth-child(2) {
    transition-delay: 0.2s;
}

.brand-core-list .core-item:nth-child(3) {
    transition-delay: 0.3s;
}

.brand-core-list .core-item:nth-child(4) {
    transition-delay: 0.4s;
}

.brand-core-list .core-item:nth-child(5) {
    transition-delay: 0.5s;
}