/*
CrossWork Corporate Website CSS
Following Design System v1.0
*/

/* CSS Custom Properties (Design System Variables) */
:root {
    /* Support both light and dark mode */
    color-scheme: light dark;
    /* Level 1: Base Colors - Enhanced Palette */
    --white: #ffffff;
    --black: #000000;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Brand Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    /* Accent Colors */
    --accent-cyan: #06b6d4;
    --accent-purple: #8b5cf6;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    

    /* Level 2: Semantic Colors - Refined */
    --color-text-primary: var(--gray-900, #0f172a);
    --color-text-secondary: var(--gray-600, #475569);
    --color-text-muted: var(--gray-500, #64748b);
    --color-text-inverse: var(--white, #ffffff);
    --color-text-accent: var(--primary-600, #2563eb);
    --color-surface-primary: var(--white, #ffffff);
    --color-surface-secondary: var(--gray-50, #f8fafc);
    --color-surface-tertiary: var(--gray-100, #f1f5f9);
    --color-surface-dark: var(--gray-900, #0f172a);
    --color-surface-gradient-start: var(--primary-600, #2563eb);
    --color-surface-gradient-end: var(--accent-cyan, #06b6d4);
    --color-border-light: var(--gray-200, #e2e8f0);
    --color-border: var(--gray-300, #cbd5e1);
    --color-border-dark: var(--gray-600, #475569);
    --color-interactive-hover: #f8fafc;
    --color-text-accent-hover: #1d4ed8;

    /* Level 3: Component Colors */
    --header-bg: var(--color-surface-primary, #ffffff);
    --header-text: var(--color-text-primary, #0f172a);
    --contact-bg: var(--color-surface-secondary, #f8fafc);
    --contact-text: var(--color-text-primary, #0f172a);

    /* Spacing System - Compact & Clean Style */
    --space-xs: 0.375rem; /* 6px */
    --space-sm: 0.75rem;  /* 12px */
    --space-md: 1.125rem; /* 18px */
    --space-lg: 1.5rem;   /* 24px */
    --space-xl: 2.25rem;  /* 36px */
    --space-xxl: 3.5rem;  /* 56px */

    /* Typography Scale - Expanded */
    --font-size-xs: 0.75rem;   /* 12px - Small captions, footnotes */
    --font-size-sm: 0.875rem;  /* 14px - Captions, labels */
    --font-size-base: 1rem;    /* 16px - Body text */
    --font-size-lg: 1.125rem;  /* 18px - Lead text, large body */
    --font-size-xl: 1.25rem;   /* 20px - Small headings */
    --font-size-2xl: 1.5rem;   /* 24px - Medium headings */
    --font-size-3xl: 1.875rem; /* 30px - Large headings */
    --font-size-4xl: 2.25rem;  /* 36px - Main headings */
    --font-size-5xl: 3rem;     /* 48px - Hero titles */
    --font-size-6xl: 3.75rem;  /* 60px - Display titles */

    /* Fluid Typography Scale */
    --font-fluid-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --font-fluid-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --font-fluid-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    --font-fluid-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
    --font-fluid-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    --font-fluid-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
    --font-fluid-3xl: clamp(1.875rem, 1.5rem + 1.5vw, 2.5rem);
    --font-fluid-4xl: clamp(2.25rem, 1.8rem + 2vw, 3rem);
    --font-fluid-5xl: clamp(3rem, 2.5rem + 2.5vw, 4rem);
    --font-fluid-6xl: clamp(3.75rem, 3rem + 3vw, 5rem);

    /* Line Heights */
    --line-height-tight: 1.4;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.7;

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Animation System - Unified Naming */
    --duration-fast: 0.15s;
    --duration-normal: 0.3s;
    --duration-slow: 0.6s;
    --duration-extra-slow: 1s;
    
    /* Easing Functions - Enhanced */
    --easing-standard: ease;
    --easing-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --easing-snappy: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --easing-gentle: cubic-bezier(0.25, 0.1, 0.25, 1);
    
    /* Stagger Animation - Optimized */
    --stagger-base: 0.15s;
    --stagger-increment: 0.15s;
    

    /* Border Radius - Professional Balance */
    --border-radius-sm: 0.25rem;  /* 4px */
    --border-radius-md: 0.5rem;   /* 8px */
    --border-radius-lg: 0.75rem;  /* 12px - Optimized for B2B trust */

    /* Responsive Spacing - Compact & Clean Style */
    --space-section-responsive: var(--space-xxl, 3.5rem);  /* 56px */
    --space-element-responsive: var(--space-lg, 1.5rem);   /* 24px */

    /* Responsive Typography - Unified Naming */
    --font-size-xl-responsive: var(--font-size-4xl, 2.5rem);
    --font-size-lg-responsive: var(--font-size-2xl, 1.5rem);
    

    /* Layout */
    --container-max-width: 1200px;
    --header-height: 80px;

    /* Breakpoints */
    --breakpoint-mobile: 768px;
    --breakpoint-tablet: 1024px;
    --breakpoint-desktop: 1025px;
}

/* Mobile Responsive Variables - Compact Style */
@media (max-width: 768px) {
    :root {
        --space-section-responsive: var(--space-xl, 2.25rem);  /* 36px */
        --space-element-responsive: var(--space-md, 1.125rem); /* 18px */
        --font-size-xl-responsive: var(--font-size-3xl, 2rem);
        --font-size-lg-responsive: var(--font-size-xl, 1.25rem);
        --header-height: 60px;
        
    }
}

@media (max-width: 480px) {
    :root {
        --space-section-responsive: var(--space-lg, 1.5rem);   /* 24px */
        --space-element-responsive: var(--space-sm, 0.75rem);  /* 12px */
        
    }
}

/* CSS Reset & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height, 80px);
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", 
                 "Noto Sans CJK JP", "Hiragino Sans", "Yu Gothic UI", 
                 "Hiragino Kaku Gothic ProN", "Meiryo UI", 
                 Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: var(--font-fluid-base);
    line-height: var(--line-height-normal, 1.6);
    color: var(--color-text-primary, #111827);
    background-color: var(--color-surface-primary, #ffffff);
    min-height: 100vh;
    overflow-x: hidden;
    font-feature-settings: "kern" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Apply text overflow handling globally to text elements */
.concept-text,
.profile-text,
.company-item dd,
.contact-item {
    overflow-wrap: break-word;
    word-break: normal;
    min-width: 0;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -100px;
    left: 6px;
    background: var(--color-surface-dark, #111827);
    color: var(--color-text-inverse, #ffffff);
    padding: var(--space-xs, 0.5rem) var(--space-sm, 1rem);
    text-decoration: none;
    border-radius: var(--border-radius-sm, 0.25rem);
    z-index: 1000;
    transition: top var(--transition-fast, 0.15s ease);
    opacity: 0;
    visibility: hidden;
}

.skip-link:focus {
    top: 6px;
    opacity: 1;
    visibility: visible;
}

/* Container - Already updated above */

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--header-bg, #ffffff);
    color: var(--header-text, #111827);
    box-shadow: var(--shadow-md, 0 4px 6px rgba(0, 0, 0, 0.1));
    height: var(--header-height, 80px);
    transition: background-color var(--transition-normal, 0.3s ease);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max-width, 1200px);
    margin: 0 auto;
    padding: 0 var(--space-sm, 1rem);
}

.header-logo img {
    height: 40px;
    width: auto;
    transition: transform var(--transition-fast, 0.15s ease);
}

.header-logo a:focus img,
.header-logo a:hover img {
    transform: scale(1.05);
}

/* Desktop Navigation */
.header-nav {
    display: flex;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--space-lg, 2rem);
}

.nav-list a {
    color: var(--header-text, #111827);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color var(--transition-fast, 0.15s ease);
}

.nav-list a:hover,
.nav-list a:focus {
    color: var(--color-text-accent, #2563eb);
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-text-accent, #2563eb);
    transition: width var(--transition-normal, 0.3s ease);
}

.nav-list a:hover::after,
.nav-list a:focus::after {
    width: 100%;
}

/* Mobile Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs, 0.5rem);
    gap: 4px;
    z-index: 110;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--header-text, #111827);
    transition: all var(--transition-normal, 0.3s ease);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Navigation */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--color-surface-primary, #ffffff);
    box-shadow: var(--shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.1));
    transition: right var(--transition-normal, 0.3s ease);
    z-index: 105;
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-content {
    padding: var(--space-lg, 1.5rem) var(--space-md, 1.125rem);
    height: 100%;
    display: flex;
    flex-direction: column;
}


.mobile-nav-list {
    list-style: none;
    margin-top: var(--space-lg, 1.5rem);
}

.mobile-nav-list li {
    margin-bottom: var(--space-md, 1.125rem);
}

.mobile-nav-list a {
    color: var(--color-text-primary, #111827);
    text-decoration: none;
    font-size: var(--font-size-lg, 1.125rem);
    font-weight: 500;
    display: block;
    padding: var(--space-sm, 1rem);
    border-radius: var(--border-radius-md, 0.5rem);
    transition: all var(--duration-normal) var(--easing-smooth);
}

.mobile-nav-list a:hover {
    background: var(--color-surface-secondary, #f9fafb);
    color: var(--color-text-accent, #2563eb);
}

/* Dark mode hover enhancement */
@media (prefers-color-scheme: dark) {
    .mobile-nav-list a:hover {
        background: var(--color-interactive-hover);
        color: var(--color-text-accent-hover);
    }
    
    .nav-list a:hover,
    .nav-list a:focus {
        color: var(--color-text-accent-hover);
    }
}

/* Smart Focus Management - Default focus styles */
.mobile-nav-list a:focus-visible {
    outline: 2px solid var(--color-text-accent, #2563eb);
    outline-offset: 2px;
}

/* Touch interaction - suppress unwanted focus styles */
.mobile-nav.touch-interaction .mobile-nav-list a:focus-visible {
    outline: none;
    background: transparent;
}

/* Touch interaction - provide tactile feedback */
.mobile-nav.touch-interaction .mobile-nav-list a:active {
    background: var(--color-interactive-pressed, rgba(37, 99, 235, 0.1));
    transform: scale(0.98);
    transition: all 0.1s ease;
}

/* Keyboard interaction - enhanced focus visibility */
.mobile-nav.keyboard-interaction .mobile-nav-list a:focus-visible {
    outline: 2px solid var(--color-text-accent);
    outline-offset: 2px;
    background: rgba(37, 99, 235, 0.05);
    border-left: 4px solid var(--color-text-accent);
    transform: translateX(4px);
    transition: all 0.2s ease;
}

/* Mouse interaction - standard focus */
.mobile-nav.mouse-interaction .mobile-nav-list a:focus-visible {
    outline: 1px solid var(--color-text-accent);
    outline-offset: 1px;
    background: transparent;
}

/* Device capability adaptations */
.mobile-nav.no-hover .mobile-nav-list a:focus-visible {
    /* Touch devices - minimal focus indication */
    outline: 1px solid var(--color-text-accent);
    outline-offset: 1px;
    background: transparent;
}

.mobile-nav.coarse-pointer .mobile-nav-list a {
    /* Larger touch targets for accessibility */
    min-height: 48px;
    display: flex;
    align-items: center;
    padding: var(--space-md, 1.125rem) var(--space-sm, 1rem);
}

.mobile-nav.reduced-motion .mobile-nav-list a {
    transition: none;
}

.mobile-nav.reduced-motion .mobile-nav-list a:active {
    transform: none;
}

/* Container focus (when preventing auto-focus) */
.mobile-nav.container-focused {
    outline: none;
}

.mobile-nav.container-focused:focus {
    outline: none;
}

/* Mobile Navigation Overlay */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    visibility: hidden;
    opacity: 0;
    transition: all var(--transition-normal, 0.3s ease);
    z-index: 104;
}

.mobile-nav-overlay.active {
    visibility: visible;
    opacity: 1;
}

/* Mobile styles */
@media (max-width: 768px) {
    .header-nav {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    body.mobile-nav-open {
        overflow: hidden;
    }
}

/* Main Content */
main {
    padding-top: var(--header-height, 80px);
}

/* Sections */
.section {
    padding: clamp(3rem, 8vw, 5rem) 0;
    text-align: center;
    position: relative;
}

.section:nth-child(even) {
    background: var(--color-surface-secondary, #f8fafc);
}

.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-border-light, #e2e8f0);
}

.section-title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 800;
    margin-bottom: clamp(1.5rem, 4vw, 2rem);
    color: var(--color-text-primary);
    line-height: var(--line-height-tight, 1.25);
    position: relative;
    display: inline-block;
}


/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-tight, 1.25);
    color: var(--color-text-primary, #111827);
    padding: 0 var(--space-sm, 1rem);
    font-feature-settings: "kern" 1;
    overflow-wrap: break-word;
    word-break: normal;
}

h1 {
    font-size: 2rem;  /* Simple, explicit, and modern */
    font-weight: 700;
    margin-block: 0.67em;
}

h2 {
    font-size: var(--font-fluid-3xl);
    font-weight: 600;
}

h3 {
    font-size: var(--font-fluid-2xl);
    font-weight: 600;
}

/* Japanese text optimization */
body:lang(ja),
[lang="ja"],
.japanese-content {
    line-height: 1.7;
    font-feature-settings: "kern" 1;
}

p {
    line-height: var(--line-height-normal, 1.5);
    margin-bottom: var(--space-sm, 1rem);
    padding: 0 var(--space-sm, 1rem);
    overflow-wrap: break-word;
    word-break: normal;
}

@media (max-width: 480px) {
    h1, h2, h3, h4, h5, h6, p {
        padding: 0 var(--space-xs, 0.75rem);
    }
}

/* Hero Section */
.hero {
    padding: 0;
    margin-top: calc(-1 * var(--header-height, 80px));
    position: relative;
    overflow: hidden;
}

.hero-container {
    width: 100%;
    height: 100vh;
    max-height: 800px;
    min-height: 600px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(2px);
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    text-align: center;
    color: var(--color-text-inverse);
    max-width: 800px;
    padding: 0 var(--space-lg);
}

.hero-title {
    font-size: var(--font-fluid-3xl);
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--space-xl);
    color: var(--white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle {
    font-size: var(--font-fluid-lg);
    line-height: 1.6;
    margin-bottom: var(--space-xl);
    color: var(--primary-100);
    font-weight: 400;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.hero-actions {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
    min-width: 160px;
    position: relative;
    overflow: hidden;
}

.hero-cta.primary {
    background: var(--primary-600, #2563eb);
    color: #ffffff; /* Always white text for consistency */
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
    border: none;
}

.hero-cta.primary:hover {
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
    transform: translateY(-1px);
}

.hero-cta.secondary {
    background: rgba(255, 255, 255, 0.15); /* より濃い背景 */
    color: #ffffff; /* Always white for hero section */
    border: 2px solid rgba(255, 255, 255, 0.6); /* より濃いボーダー */
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1); /* 軽い影 */
}

.hero-cta.secondary:hover {
    background: rgba(255, 255, 255, 0.3); /* 更に濃い背景 */
    border-color: rgba(255, 255, 255, 0.8); /* 明確なボーダー */
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15); /* 強化された影 */
}


@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-fluid-2xl);
        line-height: 1.5;
        padding: 0 var(--space-sm);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-cta {
        width: 100%;
        max-width: 280px;
    }
}

/* Vision Section - Auto-responsive Grid */
.vision-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
    gap: clamp(1rem, 3vw, 2rem);
    margin-top: clamp(1.5rem, 4vw, 2rem);
}

.vision-item {
    padding: var(--space-lg, 2rem);
    background: var(--color-surface-primary, #ffffff);
    border-radius: var(--border-radius-lg, 1rem);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.05));
    transition: border-color var(--transition-fast, 0.15s ease);
}

.vision-item:hover {
    border-color: var(--color-border, #cbd5e1);
}

.vision-title {
    font-size: var(--font-fluid-xl);
    font-weight: 700;
    margin-bottom: var(--space-sm, 1rem);
    color: var(--color-text-accent, #2563eb);
}

.vision-text {
    color: var(--color-text-secondary, #4b5563);
}

/* Removed - replaced with auto-responsive grid */

/* Concept Section - Auto-responsive Grid */
.concept-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
    gap: clamp(1rem, 3vw, 2rem);
    place-items: center;
    margin-top: clamp(1.5rem, 4vw, 2rem);
}

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

.concept-text p {
    font-size: var(--font-fluid-lg);
    color: var(--color-text-secondary, #4b5563);
    line-height: var(--line-height-relaxed, 1.75); /* 読みやすい行間 */
    margin-bottom: var(--space-md, 1.5rem);
}

.concept-image {
    min-width: 0;
}

.concept-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg, 1rem);
}

/* Auto-responsive grid handles breakpoints automatically */
@media (max-width: 600px) {
    .concept-text {
        text-align: center; /* 狭い画面では中央揃え */
    }
}

/* Business Section - Auto-responsive Grid */
.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
    gap: clamp(1rem, 3vw, 2rem);
    margin-top: clamp(1.5rem, 4vw, 2rem);
}

.business-item {
    padding: var(--space-lg, 2rem);
    background: var(--color-surface-primary, #ffffff);
    border-radius: var(--border-radius-lg, 1rem);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.05));
    transition: border-color var(--transition-fast, 0.15s ease);
}

.business-item:hover {
    border-color: var(--color-border, #cbd5e1);
}

.business-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-lg) auto;
    background: var(--color-surface-tertiary, #f1f5f9);
    border: 1px solid var(--color-border-light, #e2e8f0);
    border-radius: var(--border-radius-lg);
    color: var(--color-text-accent, #2563eb);
}

.business-icon svg {
    width: 40px;
    height: 40px;
}


.business-name {
    font-size: var(--font-fluid-xl);
    font-weight: 700;
    margin-bottom: var(--space-sm, 1rem);
    color: var(--color-text-primary, #111827);
}

.business-description {
    color: var(--color-text-secondary, #4b5563);
    text-align: left;
}

/* Auto-responsive grid handles breakpoints automatically - removed redundant media queries */

/* System Section */
.system-text {
    margin-bottom: var(--space-responsive-element, 2rem);
}

.system-text p {
    font-size: var(--font-fluid-lg);
    color: var(--color-text-secondary, #4b5563);
}

.system-diagram {
    margin-bottom: var(--space-responsive-element, 2rem);
}

.system-diagram img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg, 1rem);
}

.system-flow {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
    gap: clamp(1rem, 3vw, 2rem);
}

.system-flow-item {
    text-align: center;
}

.system-flow-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius-lg, 1rem);
    margin-bottom: var(--space-sm, 1rem);
}

.system-flow-item h3 {
    font-size: var(--font-size-xl, 1.25rem);
    font-weight: 700;
    margin-bottom: var(--space-sm, 1rem);
    color: var(--color-text-primary, #111827);
}

.system-flow-item p {
    color: var(--color-text-secondary, #4b5563);
}

/* Auto-responsive grid handles this automatically */

/* Company Section */
.company-info {
    display: grid;
    gap: var(--space-lg, 2rem);
    margin-top: var(--space-responsive-element, 2rem);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.company-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-lg, 2rem);
    align-items: start;
    padding: var(--space-md, 1.5rem);
    background: var(--color-surface-primary, #ffffff);
    border-radius: var(--border-radius-md, 0.5rem);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.05));
}

.company-item dt {
    font-weight: 700;
    color: var(--color-text-primary, #111827);
    text-align: left;
    padding: var(--space-sm, 1rem);
}

.company-item dd {
    color: var(--color-text-secondary, #4b5563);
    text-align: left;
    padding: var(--space-sm, 1rem);
    margin: 0;
}

.company-item dd a {
    color: var(--color-text-accent, #2563eb);
    text-decoration: none;
}

.company-item dd a:hover,
.company-item dd a:focus {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .company-item {
        grid-template-columns: 1fr;
        gap: var(--space-sm, 1rem);
        text-align: center;
    }
    
    .company-item dt,
    .company-item dd {
        text-align: center;
    }
}

/* Profile Section */
.profile-intro {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
    gap: clamp(1rem, 3vw, 2rem);
    place-items: center;
    margin-bottom: var(--space-responsive-element, 2rem);
    text-align: left;
}

.profile-image img {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 50%;
}

.profile-text h3 {
    font-size: var(--font-fluid-2xl);
    font-weight: 700;
    margin-bottom: var(--space-sm, 1rem);
    color: var(--color-text-primary, #111827);
}


.profile-text p {
    font-size: var(--font-fluid-lg);
    color: var(--color-text-secondary, #4b5563);
    line-height: var(--line-height-relaxed, 1.75);
}

.profile-history {
    text-align: center;
}

.profile-history h3 {
    font-size: var(--font-size-responsive-lg, 1.5rem);
    font-weight: 700;
    margin-bottom: var(--space-lg, 2rem);
    color: var(--color-text-primary, #111827);
}

.history-list {
    display: grid;
    gap: var(--space-md, 1.5rem);
    max-width: 600px;
    margin: 0 auto;
}

.history-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: var(--space-lg, 2rem);
    align-items: start;
    padding: var(--space-md, 1.5rem);
    background: var(--color-surface-primary, #ffffff);
    border-radius: var(--border-radius-md, 0.5rem);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.05));
}

.history-item dt {
    font-weight: 700;
    color: var(--color-text-accent, #2563eb);
    text-align: left;
    padding: var(--space-sm, 1rem);
}

.history-item dd {
    color: var(--color-text-secondary, #4b5563);
    text-align: left;
    padding: var(--space-sm, 1rem);
    margin: 0;
}

/* Enhanced responsive breakpoints for profile section */
@media (max-width: 640px) {
    .profile-intro {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-md, 1.5rem);
    }
    
    .profile-text {
        text-align: center;
    }
    
    .profile-image {
        max-width: 200px;
        justify-self: center;
        margin: 0 auto;
    }
    
    .history-item {
        grid-template-columns: 1fr;
        gap: var(--space-sm, 1rem);
        text-align: center;
    }
    
    .history-item dt,
    .history-item dd {
        text-align: center;
    }
}

/* Contact Section */
.contact {
    background: var(--color-surface-secondary);
    color: var(--color-text-primary);
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(37, 99, 235, 0.02);
    pointer-events: none;
}

.contact .container {
    position: relative;
    z-index: 1;
}

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


.contact-text {
    margin-bottom: var(--space-responsive-element, 2rem);
}

.contact-text p {
    font-size: var(--font-fluid-lg);
    color: var(--color-text-secondary);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
    gap: clamp(1rem, 3vw, 2rem);
    margin-bottom: clamp(1.5rem, 4vw, 2rem);
}

.contact-item {
    padding: var(--space-lg, 2rem);
    background: var(--color-surface-primary);
    border-radius: var(--border-radius-lg, 1rem);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.05));
    text-align: center;
    border: 1px solid var(--color-border-light);
}

.contact-item h3 {
    font-size: var(--font-fluid-xl);
    font-weight: 700;
    margin-bottom: var(--space-sm, 1rem);
    color: var(--color-text-primary);
}

.contact-phone,
.contact-email {
    font-size: var(--font-fluid-2xl);
    font-weight: 700;
    color: var(--color-text-accent, #3b82f6);
    margin-bottom: var(--space-xs, 0.5rem);
}

.contact-phone a,
.contact-email a {
    color: inherit;
    text-decoration: none;
}

.contact-phone a:hover,
.contact-phone a:focus,
.contact-email a:hover,
.contact-email a:focus {
    color: var(--color-text-accent, #2563eb);
    text-decoration: underline;
}

.contact-time {
    color: var(--color-text-muted, var(--gray-600, #475569));
    font-size: var(--font-fluid-sm);
    font-style: italic; /* 補助情報であることを視覚的に示す */
    margin-top: var(--space-xs, 0.5rem);
}

/* Removed - replaced with media query */



/* Footer */
.footer {
    background: var(--color-surface-dark, #111827);
    color: var(--color-text-inverse, #ffffff);
    padding: var(--space-responsive-section, 5rem) 0 var(--space-lg, 2rem);
}

.footer-content {
    text-align: center;
}

.footer-sitemap {
    margin-bottom: var(--space-responsive-element, 2rem);
}

.footer-sitemap h3 {
    font-size: var(--font-fluid-xl);
    font-weight: 700;
    margin-bottom: var(--space-lg, 2rem);
    color: #ffffff; /* Always white on dark footer background */
}

.sitemap-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-md, 1.5rem);
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
}

.sitemap-list a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast, 0.15s ease);
}

.sitemap-list a:hover,
.sitemap-list a:focus {
    color: #ffffff; /* Always white on dark footer background */
}

.footer-policies {
    margin-bottom: var(--space-lg, 2rem);
}

.policy-list {
    display: flex;
    justify-content: center;
    gap: var(--space-lg, 2rem);
    list-style: none;
    flex-wrap: wrap;
}

.policy-list a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: var(--font-size-sm, 0.875rem);
    transition: color var(--transition-fast, 0.15s ease);
}

.policy-list a:hover,
.policy-list a:focus {
    color: #ffffff; /* Always white on dark footer background */
}

.policy-list a[aria-current="page"] {
    color: #ffffff; /* Always white on dark footer background */
    font-weight: 600;
}

.footer-copyright {
    font-size: var(--font-size-sm, 0.875rem);
    color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 480px) {
    .footer-sitemap {
        grid-template-columns: 1fr;
        gap: var(--space-md, 1.5rem);
    }
    
    .policy-list {
        flex-direction: column;
        gap: var(--space-sm, 1rem);
    }
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: var(--space-lg, 2rem);
    right: var(--space-lg, 2rem);
    width: 50px;
    height: 50px;
    background: var(--color-text-accent, #2563eb);
    color: var(--color-text-inverse, #ffffff);
    border: none;
    border-radius: 50%;
    font-size: var(--font-size-xl, 1.25rem);
    cursor: pointer;
    box-shadow: var(--shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.1));
    transition: all var(--transition-fast, 0.15s ease);
    opacity: 0;
    visibility: hidden;
    z-index: 50;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover,
.back-to-top:focus {
    background: #1d4ed8;
    box-shadow: var(--shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.2));
}

/* Enhanced Focus Styles for Accessibility */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--color-text-accent, #2563eb);
    outline-offset: 2px;
}

/* Enhanced Focus for Navigation Elements */
.nav-list a:focus-visible {
    outline: 2px solid var(--color-text-accent);
    outline-offset: 4px;
    background: rgba(37, 99, 235, 0.1);
}

/* Desktop navigation doesn't need the same touch handling as mobile */
@media (hover: hover) and (pointer: fine) {
    .nav-list a:focus-visible {
        /* Desktop-specific focus styles can remain as-is */
        outline: 2px solid var(--color-text-accent);
        outline-offset: 4px;
        background: rgba(37, 99, 235, 0.1);
    }
}


/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .nav-list a:hover,
    .mobile-nav-list a:hover,
    .nav-list a::after {
        transition: none;
        transform: none;
    }
    
    /* Static color changes only */
    .nav-list a:hover {
        color: var(--color-text-accent);
        background: rgba(37, 99, 235, 0.1);
    }
    
    .mobile-nav-list a:hover {
        background: var(--color-surface-secondary);
        color: var(--color-text-accent);
        border-left: 3px solid var(--color-text-accent);
        padding-left: calc(1rem - 3px);
        transform: none;
    }
    
    /* Dark mode reduced motion */
    @media (prefers-color-scheme: dark) {
        .nav-list a:hover {
            background: var(--color-interactive-hover);
            color: var(--color-text-accent-hover);
        }
        
        .mobile-nav-list a:hover {
            background: var(--color-interactive-hover);
            color: var(--color-text-accent-hover);
            border-left-color: var(--color-text-accent-hover);
        }
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .nav-list a:hover,
    .mobile-nav-list a:hover {
        background: var(--color-text-accent);
        color: var(--color-text-inverse);
        border: 2px solid var(--color-text-primary);
    }
    
    .nav-list a::after {
        background: var(--color-text-primary);
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --color-text-primary: var(--black, #000000);
        --color-text-secondary: var(--black, #000000);
        --color-border: var(--black, #000000);
    }
}

/* Enhanced Dark Mode Support - Material Design 3.0 Compliant */
@media (prefers-color-scheme: dark) {
    :root {
        /* === Modern Base Colors (Material Design 3.0) === */
        --color-surface-primary: #121212;      /* Base background */
        --color-surface-secondary: #1e1e1e;    /* Card background (elevation 1) */
        --color-surface-tertiary: #2d2d2d;     /* Navigation/header (elevation 2) */
        --color-surface-elevated: #383838;     /* Hover/selected states (elevation 3) */
        --color-surface-nav: #242424;          /* Navigation specific */
        --color-surface-dark: #1e1e1e;         /* Inverted surface */
        
        /* === Scientific Text Hierarchy (WCAG AAA Compliant) === */
        --color-text-primary: #ffffff;         /* 15.3:1 contrast - Headlines */
        --color-text-secondary: #e3e3e3;       /* 11.2:1 contrast - Body text */
        --color-text-tertiary: #cccccc;        /* 9.1:1 contrast - Sub text */
        --color-text-muted: #b0b0b0;          /* 7.4:1 contrast - Helper text */
        --color-text-disabled: #8a8a8a;       /* 4.9:1 contrast - Disabled state */
        --color-text-inverse: #121212;        /* Inverted text */
        
        /* === Unified Brand Accent Colors === */
        --color-text-accent: #64b5f6;         /* Primary brand blue */
        --color-text-accent-hover: #90caf9;   /* Hover state */
        --color-text-accent-pressed: #42a5f5; /* Pressed state */
        
        /* === Progressive Border System === */
        --color-border-subtle: #2a2a2a;       /* Subtle divisions */
        --color-border-light: #404040;        /* Standard borders */
        --color-border-medium: #565656;       /* Emphasized borders */
        --color-border-strong: #757575;       /* Strong emphasis */
        --color-border: var(--color-border-light); /* Default alias */
        --color-border-dark: var(--color-border-strong); /* Dark alias */
        
        /* === Semantic State Colors === */
        --color-success-bg: #1b5e20;
        --color-success-text: #81c784;
        --color-warning-bg: #e65100;
        --color-warning-text: #ffb74d;
        --color-error-bg: #c62828;
        --color-error-text: #e57373;
        
        /* === Interactive States === */
        --color-interactive-hover: #2a2a2a;
        --color-interactive-pressed: #3a3a3a;
        --color-interactive-focus: #64b5f6;
        
        /* === Component Specific Colors === */
        --header-bg: var(--color-surface-tertiary);
        --header-text: var(--color-text-primary);
        --contact-bg: var(--color-surface-secondary);
        --contact-text: var(--color-text-primary);
        
        /* === Enhanced Shadow System (Elevation) === */
        --shadow-card: 
            0 1px 3px rgba(0,0,0,0.4),
            0 1px 2px rgba(0,0,0,0.24);
        --shadow-nav:
            0 3px 6px rgba(0,0,0,0.4),
            0 2px 4px rgba(0,0,0,0.32);
        --shadow-modal:
            0 6px 12px rgba(0,0,0,0.6),
            0 4px 8px rgba(0,0,0,0.48);
        --shadow-accent:
            0 0 12px rgba(100,181,246,0.24),
            0 2px 8px rgba(100,181,246,0.16);
    }
    
    /* === Enhanced Card Components with Elevation === */
    .vision-item,
    .business-item,
    .company-item {
        box-shadow: var(--shadow-card);
        border: 1px solid var(--color-border-subtle);
        background: var(--color-surface-secondary);
    }
    
    .vision-item:hover,
    .business-item:hover,
    .company-item:hover {
        background: var(--color-interactive-hover);
        border-color: var(--color-border-light);
        transform: translateY(-1px);
        transition: all 0.2s ease;
    }
    
    /* === Navigation Enhancement === */
    .header {
        box-shadow: var(--shadow-nav);
        border-bottom: 1px solid var(--color-border-light);
    }
    
    .mobile-nav {
        background: var(--color-surface-secondary);
        box-shadow: var(--shadow-modal);
        border-left: 1px solid var(--color-border-light);
    }
    
    /* === Enhanced Focus States === */
    .nav-list a:focus-visible,
    .mobile-nav-list a:focus-visible {
        outline-color: var(--color-interactive-focus);
        box-shadow: var(--shadow-accent);
    }
    
    .mobile-nav.keyboard-interaction .mobile-nav-list a:focus-visible {
        outline-color: var(--color-interactive-focus);
        background: var(--color-interactive-hover);
        border-left-color: var(--color-text-accent);
        box-shadow: var(--shadow-accent);
    }
    
    /* === Button Enhancement === */
    .hero-cta.primary {
        background: var(--color-text-accent);
        color: #ffffff; /* Always white for maximum contrast */
        border: none;
    }
    
    .hero-cta.primary:hover {
        background: var(--color-text-accent-hover);
        transform: translateY(-1px);
    }
    
    .hero-cta.secondary {
        background: rgba(255, 255, 255, 0.12); /* 半透明背景でコントラスト確保 */
        color: #ffffff; /* Always white for visibility */
        border: 2px solid rgba(255, 255, 255, 0.8); /* より濃いボーダー */
        backdrop-filter: blur(10px);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); /* 軽い影で深度追加 */
    }
    
    .hero-cta.secondary:hover {
        background: rgba(255, 255, 255, 0.25); /* より明確な背景 */
        border-color: rgba(255, 255, 255, 0.95); /* ほぼ不透明 */
        color: #ffffff;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2); /* より強い影 */
    }
    
    .hero-cta.primary:focus,
    .hero-cta.secondary:focus {
        outline-color: var(--color-interactive-focus);
        box-shadow: var(--shadow-accent);
    }
    
    .back-to-top {
        background: var(--color-surface-tertiary);
        color: var(--color-text-primary);
        box-shadow: var(--shadow-card);
        border: 1px solid var(--color-border-light);
    }
    
    .back-to-top:hover,
    .back-to-top:focus {
        background: var(--color-interactive-hover);
        box-shadow: var(--shadow-nav);
    }
    
    /* === Business Icons Enhancement === */
    .business-icon {
        background: var(--color-surface-elevated);
        border-color: var(--color-border-medium);
        color: var(--color-text-accent);
    }
    
    /* === Contact Section Enhancement === */
    .contact-item {
        background: var(--color-surface-secondary);
        border: 1px solid var(--color-border-subtle);
        box-shadow: var(--shadow-card);
    }
    
    /* === Improved Text Contrast === */
    .vision-text,
    .concept-text p,
    .business-description,
    .system-text p,
    .system-flow-item p,
    .company-item dd,
    .profile-text p,
    .contact-time {
        color: var(--color-text-secondary);
    }
    
    .vision-title,
    .business-name,
    .system-flow-item h3,
    .company-item dt,
    .profile-intro h3 {
        color: var(--color-text-accent);
    }
    
    /* === Contact Section Specific === */
    .contact-time {
        color: var(--color-text-tertiary); /* より明るい色でさらに読みやすく */
    }
}

/* Loading and Performance Optimizations */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Modern Responsive Container */
.container {
    max-width: var(--container-max-width, 1200px);
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
}

/* Container queries removed - replaced with modern responsive design */

/* Policy Pages Styles */
.policy-page {
    padding: var(--space-responsive-section, 5rem) 0;
}

.policy-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--color-surface-primary, #ffffff);
    border-radius: var(--border-radius-lg, 1rem);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.05));
    padding: var(--space-responsive-element, 2rem);
}

.policy-header {
    text-align: center;
    margin-bottom: var(--space-responsive-element, 2rem);
    padding-bottom: var(--space-lg, 2rem);
    border-bottom: 1px solid var(--color-border, #d1d5db);
}

/* Semantic HTML elements h1 styles */
article h1,
section h1,
nav h1,
aside h1 {
    font-size: var(--font-fluid-3xl);
    font-weight: 700;
    margin-bottom: var(--space-sm, 1rem);
    color: var(--color-text-primary, #111827);
}

.policy-header h1 {
    font-size: var(--font-fluid-3xl);
    font-weight: 700;
    margin-bottom: var(--space-sm, 1rem);
    color: var(--color-text-primary, #111827);
}

.policy-updated {
    color: var(--color-text-secondary, #4b5563);
    font-size: var(--font-size-sm, 0.875rem);
}

.policy-section {
    margin-bottom: var(--space-responsive-element, 2rem);
    text-align: left;
}

.policy-section h2 {
    font-size: var(--font-size-responsive-lg, 1.5rem);
    font-weight: 700;
    margin-bottom: var(--space-md, 1.5rem);
    color: var(--color-text-primary, #111827);
    padding: 0 var(--space-sm, 1rem);
}

.policy-section h3 {
    font-size: var(--font-size-xl, 1.25rem);
    font-weight: 600;
    margin-bottom: var(--space-sm, 1rem);
    margin-top: var(--space-lg, 2rem);
    color: var(--color-text-primary, #111827);
    padding: 0 var(--space-sm, 1rem);
}

.policy-section p {
    margin-bottom: var(--space-sm, 1rem);
    line-height: var(--line-height-relaxed, 1.75);
    color: var(--color-text-secondary, #4b5563);
    padding: 0 var(--space-sm, 1rem);
}

.policy-section ul {
    margin-bottom: var(--space-sm, 1rem);
    padding-left: var(--space-xl, 3rem);
    list-style-type: disc;
}

.policy-section li {
    margin-bottom: var(--space-xs, 0.5rem);
    line-height: var(--line-height-normal, 1.5);
    color: var(--color-text-secondary, #4b5563);
}


@media (max-width: 768px) {
    .policy-content {
        padding: var(--space-md, 1.5rem);
        margin: 0 var(--space-sm, 1rem);
    }
    
    .policy-section h2 {
        padding: 0 var(--space-xs, 0.5rem);
    }
    
    .policy-section h3 {
        padding: 0 var(--space-xs, 0.5rem);
    }
    
    .policy-section p {
        padding: 0 var(--space-xs, 0.5rem);
    }
    
    .policy-section ul {
        padding-left: var(--space-lg, 2rem);
    }
}

/* Print Styles */
@media print {
    .header,
    .mobile-nav,
    .mobile-nav-overlay,
    .back-to-top {
        display: none !important;
    }
    
    main {
        padding-top: 0;
    }
    
    .section {
        page-break-inside: avoid;
        padding: var(--space-lg, 2rem) 0;
    }
    
    a {
        text-decoration: underline;
    }
    
    
    .policy-page {
        padding: var(--space-lg, 2rem) 0;
    }
    
    .policy-content {
        box-shadow: none;
    }
}



.hero-cta.primary:focus {
    outline: 2px solid rgba(255, 255, 255, 0.8);
    outline-offset: 2px;
}