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

:root {
    /* Color Palette */
    --color-primary: #FF5A60;
    --color-primary-hover: #E04A50;
    --color-text-dark: #1A1A1A;
    --color-text-light: #FFFFFF;
    --color-text-gray: #4A4A4A;
    --color-bg-light: #F5F5F7;
    --color-bg-dark: rgba(0, 0, 0, 0.5);

    /* Typography */
    --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-text-dark);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-image: url('images/hero-bg.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--color-text-light);
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-dark);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--spacing-md);
    max-width: 800px;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    font-weight: var(--font-weight-regular);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 36px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 20px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 2px;
    animation: scroll 1.5s infinite;
}

/* CTA Buttons */
.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-smooth);
    cursor: pointer;
    border: none;
    text-align: center;
}

.cta-primary {
    background: var(--color-primary);
    color: var(--color-text-light);
    box-shadow: 0 4px 16px rgba(255, 90, 96, 0.3);
}

.cta-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 90, 96, 0.4);
}

.cta-secondary {
    background: var(--color-primary);
    color: var(--color-text-light);
    box-shadow: 0 4px 16px rgba(255, 90, 96, 0.2);
}

.cta-secondary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 90, 96, 0.3);
}

/* Highlights Section */
.highlights {
    padding: var(--spacing-xxl) var(--spacing-md);
    background: var(--color-bg-light);
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

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

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-dark);
    letter-spacing: -0.01em;
}

.section-description {
    font-size: clamp(1rem, 2vw, 1.125rem);
    line-height: 1.9;
    color: var(--color-text-gray);
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Footer */
.footer {
    background: var(--color-text-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
}

.copyright {
    font-size: 0.875rem;
    font-weight: var(--font-weight-regular);
}

/* Utility Classes */
.desktop-only {
    display: none;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

/* Responsive Design - Tablet */
@media (min-width: 768px) {
    :root {
        --spacing-md: 2.5rem;
        --spacing-lg: 4rem;
        --spacing-xl: 5rem;
        --spacing-xxl: 8rem;
    }

    .hero-content {
        padding: var(--spacing-lg);
    }

    .desktop-only {
        display: inline;
    }

    .cta-button {
        padding: 1.125rem 3rem;
        font-size: 1.0625rem;
    }
}

/* Responsive Design - Desktop */
@media (min-width: 1024px) {
    :root {
        --spacing-xxl: 10rem;
    }

    .hero-description br {
        display: block;
    }

    .section-description br {
        display: block;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #E04A50;
    }

    .hero-overlay {
        background: rgba(0, 0, 0, 0.7);
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .highlights {
        background: #1A1A1A;
    }

    .section-title {
        color: var(--color-text-light);
    }

    .section-description {
        color: rgba(255, 255, 255, 0.8);
    }
}