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

/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --white: #ffffff;
    --black: #000000;
    
    /* Typography */
    --font-family-base: 'Noto Sans JP', 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    --font-size-base: 0.9vw;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.3vw;
    --spacing-sm: 0.6vw;
    --spacing-md: 1.125vw;
    --spacing-lg: 1.65vw;
    --spacing-xl: 2.25vw;
    
    /* Breakpoints */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
    
    /* Container */
    --container-max-width: 1200px;
    
    /* Animation */
    --transition-base: 0.3s ease;
    --animation-duration: 0.6s;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--dark-color);
    background-color: var(--white);
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

/* Container */
.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    text-align: center;
}

/* Section Base */
section {
    padding: var(--spacing-xl) 0;
}

/* Typography */
.section-title {
    font-size: 2.25vw;
    font-weight: bold;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--dark-color);
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(1.5vw);
    transition: opacity var(--animation-duration) ease, transform var(--animation-duration) ease;
}

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

.slide-in-left {
    opacity: 0;
    transform: translateX(-2.625vw);
    transition: opacity var(--animation-duration) ease, transform var(--animation-duration) ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(2.625vw);
    transition: opacity var(--animation-duration) ease, transform var(--animation-duration) ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

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

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sp-only {
        display: block;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section-title {
        font-size: 3.75vw;
    }
    
    section {
        padding: var(--spacing-md) 0;
    }
}

@media (max-width: 576px) {
    .sp-only {
        display: block;
    }
    
    .section-title {
        font-size: 3.375vw;
    }
    
    section {
        padding: var(--spacing-sm) 0;
    }
}