:root {
    /* モダンで洗練されたカラーパレット */
    --primary-gradient: linear-gradient(135deg, #ff8c42 0%, #ff6b35 100%);
    --secondary-gradient: linear-gradient(135deg, #ffa726 0%, #ff7043 100%);
    --accent-gradient: linear-gradient(135deg, #42a5f5 0%, #1e88e5 100%);
    --warm-gradient: linear-gradient(135deg, #ffcc80 0%, #ffab91 100%);
    --premium-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --dark-gradient: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    
    --primary-color: #ff8c42;
    --secondary-color: #ff6b35;
    --accent-color: #42a5f5;
    --success-color: #66bb6a;
    --warning-color: #ef5350;
    --premium-color: #667eea;
    
    --background-primary: #ffffff;
    --background-secondary: #fafbfc;
    --background-tertiary: #f5f7fa;
    --background-card: rgba(255, 255, 255, 0.9);
    --background-glass: rgba(255, 255, 255, 0.7);
    --background-overlay: rgba(0, 0, 0, 0.5);
    
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --text-accent: #2d3748;
    --text-light: #a0aec0;
    
    --shadow-xs: 0 0 0 1px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(255, 140, 66, 0.2);
    --shadow-glow-accent: 0 0 40px rgba(66, 165, 245, 0.2);
    
    --border-subtle: 1px solid rgba(203, 213, 224, 0.4);
    --border-glass: 1px solid rgba(255, 255, 255, 0.2);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --border-radius-xl: 32px;
    --border-radius-full: 9999px;
    
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --transition-bounce: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    
    /* スペーシングシステム */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* タイポグラフィ */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    --font-size-7xl: 4.5rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* z-index層 */
    --z-below: -1;
    --z-base: 0;
    --z-dropdown: 1000;
    --z-sticky: 1100;
    --z-fixed: 1200;
    --z-overlay: 1300;
    --z-modal: 1400;
    --z-popover: 1500;
    --z-tooltip: 1600;
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* カスタムスクロールバー */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--background-secondary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    border-radius: 6px;
    border: 2px solid var(--background-secondary);
    transition: var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--secondary-color), var(--primary-color));
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
}

/* グローバル背景エフェクト */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(66, 165, 245, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(102, 126, 234, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(245, 247, 250, 0.03) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

/* ノイズテクスチャ */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.015;
    z-index: -1;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* プログレスインジケーター */
.progress-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    transform-origin: left;
    transform: scaleX(0);
    transition: transform var(--transition-fast);
    z-index: var(--z-tooltip);
}

/* ヘッダー */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: var(--z-sticky);
    padding: var(--space-lg) 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: var(--border-subtle);
    transition: all var(--transition-slow);
}

header.scrolled {
    padding: var(--space-md) 0;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-lg);
}

header.hidden {
    transform: translateY(-100%);
}

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

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-medium);
}

.logo img {
    height: 40px;
    margin-right: 12px;
    transition: all var(--transition-medium);
    border-radius: var(--border-radius-small);
}

.logo:hover {
    transform: translateY(-1px);
}

.logo:hover img {
    filter: drop-shadow(0 8px 16px rgba(255, 140, 66, 0.4));
}

/* ナビゲーション */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    position: relative;
    transition: all var(--transition-smooth);
    backdrop-filter: blur(16px);
    border: var(--border-subtle);
    background: var(--background-card);
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transform: translateX(-50%);
    transition: width var(--transition-medium);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--background-glass);
    border-color: var(--border-glass);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.nav-link:hover::before {
    width: 70%;
}

.nav-link.active {
    color: var(--primary-color);
    background: linear-gradient(135deg, rgba(255, 140, 66, 0.1), rgba(255, 107, 53, 0.1));
    border-color: rgba(255, 140, 66, 0.3);
    font-weight: var(--font-weight-semibold);
}

.nav-link.active::before {
    width: 100%;
    background: var(--primary-gradient);
}

.mobile-menu-btn {
    display: none;
    background: var(--background-card);
    border: var(--border-subtle);
    color: var(--text-primary);
    padding: 12px;
    border-radius: var(--border-radius);
    cursor: pointer;
    backdrop-filter: blur(16px);
    transition: all var(--transition-medium);
}

.mobile-menu-btn:hover {
    background: var(--background-glass);
    border-color: var(--border-glass);
    box-shadow: var(--shadow-glow);
}

/* ヒーローセクション */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 0;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.95) 0%, 
        rgba(250, 251, 252, 0.95) 50%, 
        rgba(245, 247, 250, 0.95) 100%);
}

/* 動的グラデーションバックグラウンド */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -25%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, 
        rgba(66, 165, 245, 0.08) 0%, 
        rgba(102, 126, 234, 0.06) 25%, 
        rgba(245, 247, 250, 0.04) 50%, 
        transparent 70%);
    animation: rotateGradient 20s linear infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -25%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, 
        rgba(102, 126, 234, 0.08) 0%, 
        rgba(66, 165, 245, 0.06) 25%, 
        rgba(240, 242, 245, 0.04) 50%, 
        transparent 70%);
    animation: rotateGradient 25s linear infinite reverse;
}

@keyframes rotateGradient {
    from { transform: rotate(0deg) scale(1.5); }
    to { transform: rotate(360deg) scale(1.5); }
}

@keyframes floatSlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -30px) scale(1.1); }
}

.hero-content {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    z-index: 2;
}

.hero-text {
    max-width: 680px;
    padding: 0 60px;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.95) 0%, 
        rgba(250, 251, 252, 0.9) 100%);
    backdrop-filter: blur(24px) saturate(120%);
    -webkit-backdrop-filter: blur(24px) saturate(120%);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0 var(--border-radius-xl) var(--border-radius-xl) 0;
    padding: var(--space-4xl) var(--space-4xl);
    box-shadow: 
        0 30px 60px rgba(0, 0, 0, 0.12),
        0 4px 8px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    position: relative;
    overflow: hidden;
}

.hero-text::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, 
        var(--primary-color) 0%, 
        var(--accent-color) 50%, 
        var(--secondary-color) 100%);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { transform: translateX(-100%); }
    50% { transform: translateX(100%); }
}

.hero-text h1 {
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
    letter-spacing: -0.04em;
    animation: heroTextReveal 1s ease-out;
    position: relative;
}

.hero-text h1 .highlight {
    position: relative;
    background: linear-gradient(135deg, #f97316 0%, #ec4899 50%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 4s ease-in-out infinite;
    display: inline-block;
    font-weight: 900;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-text h1 .highlight::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transform-origin: left;
    animation: underlineReveal 0.8s ease-out 0.5s forwards;
}

@keyframes underlineReveal {
    to { transform: scaleX(1); }
}

@keyframes heroTextReveal {
    from {
        opacity: 0;
        transform: translateY(30px);
        filter: blur(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
        filter: blur(0);
    }
}

.hero-text p {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    line-height: 1.8;
    animation: heroTextReveal 1s ease-out 0.2s both;
    max-width: 540px;
    opacity: 0.9;
}

.hero-image {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.hero-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(0, 0, 0, 0.2) 0%, 
        rgba(0, 0, 0, 0.4) 100%);
    z-index: 2;
}


.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}


@keyframes heroImageReveal {
    from {
        opacity: 0;
        transform: translateX(50px) scale(0.95);
        filter: blur(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
        filter: blur(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px) translateZ(0);
    }
    to {
        opacity: 1;
        transform: translateX(0) translateZ(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px) translateZ(0);
    }
    to {
        opacity: 1;
        transform: translateX(0) translateZ(0);
    }
}

/* ボタンスタイル */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
    color: #ffffff;
    text-decoration: none;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 4px 14px rgba(249, 115, 22, 0.3), 
        0 1px 3px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    animation: heroTextReveal 1s ease-out 0.4s both;
    transform-origin: center;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 25px rgba(255, 140, 66, 0.4);
}

.btn:active {
    transform: translateY(0) scale(0.98);
}

.btn i {
    transition: transform var(--transition-spring);
}

.btn:hover i {
    transform: translateX(4px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    backdrop-filter: blur(16px);
    box-shadow: 0 4px 15px rgba(255, 140, 66, 0.1);
}

.btn-outline::before {
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s;
}

.btn-outline:hover::before {
    opacity: 0.1;
}

.btn-outline:hover {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    box-shadow: 0 8px 25px rgba(255, 140, 66, 0.2);
    border-color: var(--text-muted);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: all var(--transition-slow);
}

.btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 
        0 8px 20px rgba(249, 115, 22, 0.4), 
        0 2px 6px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    background: linear-gradient(135deg, #fb923c 0%, #f97316 100%);
}

.btn:hover::before {
    left: 100%;
}

.btn i {
    transition: all var(--transition-medium);
}

.btn:hover i {
    transform: translateX(3px);
}

/* セクション共通スタイル */
section {
    padding: 120px 0;
    position: relative;
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-4xl);
    position: relative;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-title h2 {
    font-size: clamp(2.25rem, 5vw, 3rem);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
    position: relative;
    letter-spacing: -0.03em;
    line-height: var(--line-height-tight);
}

.section-title h2 .gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-full);
    animation: expandWidth 0.8s ease-out 0.3s both;
}

@keyframes expandWidth {
    from {
        width: 0;
    }
    to {
        width: 80px;
    }
}

.section-title p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* サービスセクション */
.services {
    background: var(--background-secondary);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 30% 20%, rgba(255, 140, 66, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(255, 167, 38, 0.06) 0%, transparent 50%);
    z-index: 1;
}

/* サービスタブ */
.service-tabs {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
    position: relative;
    z-index: 2;
}

.tab-button {
    padding: 12px 32px;
    background: var(--background-card);
    border: var(--border-subtle);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-medium);
    backdrop-filter: blur(16px);
}

.tab-button:hover {
    background: var(--background-glass);
    border-color: var(--border-glass);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.tab-button.active {
    background: var(--primary-gradient);
    color: #ffffff;
    border-color: transparent;
    box-shadow: var(--shadow-medium);
}

/* サービスカテゴリ */
.service-category {
    display: none;
    position: relative;
    z-index: 2;
}

.service-category.active {
    display: block;
}

.services-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.service-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-lg);
    padding: var(--space-2xl);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transform-style: preserve-3d;
    will-change: transform;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.service-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        transparent 0%, 
        rgba(255, 140, 66, 0.05) 50%, 
        rgba(66, 165, 245, 0.05) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.service-card:hover {
    transform: translateY(-8px) rotateX(-2deg);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.1),
        0 0 60px rgba(255, 140, 66, 0.1);
    border-color: rgba(255, 140, 66, 0.2);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover::after {
    opacity: 1;
}

/* サービスカードヘッダー */
.service-header {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin-bottom: 20px;
    gap: 16px;
}

.service-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, 
        rgba(255, 140, 66, 0.1) 0%, 
        rgba(255, 107, 53, 0.05) 100%);
    border: 2px solid rgba(255, 140, 66, 0.2);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 28px;
    flex-shrink: 0;
    transition: all var(--transition-spring);
    position: relative;
}

.service-icon::before {
    content: '';
    position: absolute;
    inset: -8px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-md);
    opacity: 0;
    filter: blur(20px);
    transition: opacity var(--transition-base);
    z-index: -1;
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
    animation: iconFloat 2s ease-in-out infinite;
}

.service-card:hover .service-icon::before {
    opacity: 0.4;
}

@keyframes iconFloat {
    0%, 100% { transform: scale(1.1) rotate(5deg) translateY(0); }
    50% { transform: scale(1.1) rotate(5deg) translateY(-5px); }
}

/* 動画アイコンのスタイル */
.service-icon.video-icon {
    background: #f5f5f5;
    padding: 0;
    overflow: hidden;
    border: 2px solid rgba(255, 140, 66, 0.2);
}

.service-icon.video-icon video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    border-radius: var(--border-radius-md);
    background: #fff;
}

.service-icon.video-icon i {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    font-size: 24px;
    color: var(--primary-color);
    z-index: 1;
    pointer-events: none;
}

.service-card:hover .service-icon.video-icon {
    transform: scale(1.1) rotate(5deg);
    animation: iconFloat 2s ease-in-out infinite;
}

.service-icon.video-icon:hover i {
    opacity: 0;
}

.service-title-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.service-header h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
    line-height: var(--line-height-tight);
    transition: color var(--transition-base);
}

.service-card:hover .service-header h3 {
    color: var(--primary-color);
}

.price-badge {
    background: var(--warm-gradient);
    color: #ffffff;
    padding: 4px 12px;
    border-radius: var(--border-radius-small);
    font-weight: 600;
    font-size: 0.8rem;
    white-space: nowrap;
    margin-left: auto;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: all var(--transition-medium);
    z-index: -1;
}

.service-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--shadow-glow);
    border-color: var(--border-glass);
    background: var(--background-glass);
}

.service-card:hover::before {
    opacity: 0.05;
}

.service-card > p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
    flex-grow: 1;
}

.service-features {
    list-style: none;
    margin-bottom: 24px;
}

.service-features li {
    padding: 10px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 24px;
    font-size: 0.95rem;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.service-footer {
    margin-top: auto;
    padding-top: 20px;
    border-top: var(--border-subtle);
}

.development-time {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-medium);
}

.service-link:hover {
    gap: 12px;
    text-decoration: underline;
}

/* 予算別提案セクション */
.budget-proposal {
    margin-top: 80px;
    background: var(--background-card);
    backdrop-filter: blur(16px);
    border: var(--border-subtle);
    border-radius: var(--border-radius-xl);
    padding: 48px;
    text-align: center;
}

.budget-proposal h3 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 48px;
}

.budget-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.budget-card {
    background: var(--background-glass);
    border: var(--border-subtle);
    border-radius: var(--border-radius-large);
    padding: 32px;
    position: relative;
    transition: all var(--transition-medium);
}

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

.budget-card.featured {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(255, 140, 66, 0.1) 0%, rgba(255, 107, 53, 0.1) 100%);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-gradient);
    color: #ffffff;
    padding: 4px 16px;
    border-radius: var(--border-radius-small);
    font-size: 0.8rem;
    font-weight: 600;
}

.budget-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.budget-range {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
}

.budget-card ul {
    list-style: none;
    text-align: left;
}

.budget-card ul li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 24px;
    font-size: 0.95rem;
}

.budget-card ul li::before {
    content: '•';
    position: absolute;
    left: 8px;
    color: var(--primary-color);
}

.budget-note {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ポートフォリオ/ケーススタディセクション */
/* 実績概要 */
.achievements-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-4xl);
    padding: var(--space-3xl);
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.95) 0%, 
        rgba(250, 251, 252, 0.95) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.achievements-summary::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, 
        rgba(255, 140, 66, 0.1) 0%, 
        transparent 70%);
    animation: rotateGradient 30s linear infinite;
}

.achievement-item {
    text-align: center;
    position: relative;
    z-index: 1;
    padding: var(--space-xl);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
}

.achievement-item:hover {
    background: rgba(255, 255, 255, 0.5);
    transform: translateY(-4px);
}

.achievement-number {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-sm);
    line-height: 1;
    animation: countUp 1s ease-out;
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.achievement-label {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ケーススタディカード */
.portfolio-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-2xl);
    animation: fadeInUp 0.8s ease-out;
}

.case-study-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all var(--transition-smooth);
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
    transform-style: preserve-3d;
}

.case-study-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.case-study-card.featured {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
}

.case-study-card:hover {
    transform: translateY(-10px) rotateX(-2deg);
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.15),
        0 0 80px rgba(66, 165, 245, 0.1);
    border-color: rgba(66, 165, 245, 0.3);
}

.case-study-card:hover::before {
    transform: scaleX(1);
}

.case-study-image {
    position: relative;
    overflow: hidden;
    background: var(--background-secondary);
    height: 240px;
}

.case-study-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all var(--transition-slow);
}

.case-study-card:hover .case-study-image img {
    transform: scale(1.1);
    filter: brightness(1.1);
}

.case-study-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--background-tertiary);
    color: var(--text-muted);
}

.case-study-placeholder i {
    font-size: 4rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.case-study-placeholder p {
    font-size: 0.9rem;
    text-align: center;
}

.case-study-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--primary-gradient);
    color: #ffffff;
    padding: 6px 16px;
    border-radius: var(--border-radius-small);
    font-size: 0.85rem;
    font-weight: 600;
}

.case-study-content {
    padding: var(--space-2xl);
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 24px;
}

.case-study-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 16px;
}

.case-study-header h3 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.tech-stack {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tech-badge {
    background: var(--background-secondary);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: var(--border-radius-small);
    font-size: 0.85rem;
    font-weight: 500;
    border: var(--border-subtle);
}

.case-study-overview h4,
.case-study-results h4,
.case-study-challenges h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.case-study-overview p,
.case-study-challenges p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.case-study-results ul {
    list-style: none;
    padding: 0;
}

.case-study-results li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    color: var(--text-secondary);
}

.case-study-results li i {
    color: var(--success-color);
    width: 20px;
}

.case-study-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: auto;
}

.case-study-actions .btn {
    flex: 1;
    min-width: 180px;
    justify-content: center;
}

/* その他の実績 */
.other-projects {
    margin-top: 80px;
    text-align: center;
}

.other-projects h3 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 48px;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px;
}

.project-item {
    background: var(--background-card);
    backdrop-filter: blur(16px);
    border: var(--border-subtle);
    border-radius: var(--border-radius-large);
    padding: 32px;
    text-align: center;
    transition: all var(--transition-medium);
}

.project-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
    border-color: var(--border-glass);
}

.project-item i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.project-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.project-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* プロセスセクション */
.process {
    background: var(--background-secondary);
    position: relative;
}

.process::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 80% 30%, rgba(72, 202, 228, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 20% 70%, rgba(255, 154, 86, 0.08) 0%, transparent 50%);
    z-index: 1;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    position: relative;
    z-index: 2;
}

.step {
    text-align: center;
    padding: 40px 20px;
    background: var(--background-glass);
    backdrop-filter: blur(20px);
    border: var(--border-glass);
    border-radius: var(--border-radius);
    transition: all var(--transition-medium);
    position: relative;
}

.step::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--accent-gradient);
    opacity: 0;
    border-radius: var(--border-radius);
    transition: all var(--transition-medium);
    z-index: -1;
}

.step:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: var(--shadow-medium);
}

.step:hover::before {
    opacity: 0.1;
}

.step-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--text-primary);
    transition: all var(--transition-medium);
    box-shadow: var(--shadow-light);
}

.step:hover .step-icon {
    transform: scale(1.1) rotate(10deg);
    box-shadow: var(--shadow-medium);
}

.step h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.step p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* コンタクトセクション */
.contact {
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 40% 20%, rgba(255, 107, 107, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 60% 80%, rgba(254, 202, 87, 0.08) 0%, transparent 50%);
    z-index: 1;
}

.cta-message {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    z-index: 2;
}

.cta-message p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.contact-form {
    max-width: 700px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(203, 213, 224, 0.4);
    border-radius: var(--border-radius-lg);
    padding: var(--space-3xl);
    position: relative;
    z-index: 2;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
}

.form-group {
    margin-bottom: var(--space-xl);
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-base);
}

.form-group.focused label {
    color: var(--primary-color);
}

.form-group.error label {
    color: var(--warning-color);
}

.form-group.success label {
    color: var(--success-color);
}

.form-control {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background: rgba(249, 250, 251, 0.95);
    border: 2px solid rgba(203, 213, 224, 0.6);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    position: relative;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05) inset;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(255, 140, 66, 0.15), 0 1px 3px rgba(0, 0, 0, 0.05) inset;
    background: rgba(255, 255, 255, 1);
}

.form-group.error .form-control {
    border-color: var(--warning-color);
    box-shadow: 0 0 0 4px rgba(239, 83, 80, 0.1);
}

.form-group.success .form-control {
    border-color: var(--success-color);
    box-shadow: 0 0 0 4px rgba(102, 187, 106, 0.1);
}

.form-control::placeholder {
    color: rgba(113, 128, 150, 0.7);
    transition: opacity var(--transition-base);
    font-weight: 400;
}

.form-control:focus::placeholder {
    opacity: 0.5;
}

/* フォームフィードバック */
.form-feedback {
    position: absolute;
    bottom: -24px;
    left: 0;
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-base);
}

.form-group.error .form-feedback,
.form-group.success .form-feedback {
    opacity: 1;
    transform: translateY(0);
}

.form-group.error .form-feedback {
    color: var(--warning-color);
}

.form-group.success .form-feedback {
    color: var(--success-color);
}

.form-feedback i {
    font-size: var(--font-size-xs);
}

/* リアルタイム文字カウンター */
.char-counter {
    position: absolute;
    bottom: -24px;
    right: 0;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    transition: color var(--transition-base);
}

.char-counter.warning {
    color: var(--warning-color);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
    font-family: inherit;
    line-height: var(--line-height-normal);
}

/* 送信ボタン */
.submit-wrapper {
    text-align: center;
    margin-top: var(--space-2xl);
}

.btn-submit {
    min-width: 200px;
    position: relative;
    overflow: hidden;
}

.btn-submit.loading {
    color: transparent;
    pointer-events: none;
}

.btn-submit.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin: -10px 0 0 -10px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 成功メッセージ */
.form-success-message {
    display: none;
    padding: var(--space-lg);
    background: linear-gradient(135deg, 
        rgba(102, 187, 106, 0.1) 0%, 
        rgba(129, 199, 132, 0.1) 100%);
    border: 2px solid var(--success-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    text-align: center;
    animation: slideInUp 0.5s ease-out;
}

.form-success-message.show {
    display: block;
}

.form-success-message i {
    font-size: var(--font-size-3xl);
    color: var(--success-color);
    margin-bottom: var(--space-md);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* フッター */
footer {
    background: var(--background-secondary);
    padding: 60px 0 30px;
    position: relative;
    border-top: var(--border-glass);
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 30% 50%, rgba(255, 154, 86, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(254, 202, 87, 0.05) 0%, transparent 50%);
    z-index: 1;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.footer-logo p:first-child {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.footer-address {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-social {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.social-icon {
    width: 50px;
    height: 50px;
    background: var(--background-glass);
    backdrop-filter: blur(20px);
    border: var(--border-glass);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-medium);
    font-size: 1.2rem;
}

.social-icon:hover {
    background: var(--primary-gradient);
    color: var(--text-primary);
    transform: translateY(-3px) scale(1.1);
    box-shadow: var(--shadow-light);
}

.footer-copyright {
    text-align: right;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* マイクロインタラクション */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-2px); }
    20%, 40%, 60%, 80% { transform: translateX(2px); }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes glow {
    0% { box-shadow: 0 0 5px rgba(255, 140, 66, 0.2); }
    50% { box-shadow: 0 0 20px rgba(255, 140, 66, 0.4), 0 0 30px rgba(255, 140, 66, 0.2); }
    100% { box-shadow: 0 0 5px rgba(255, 140, 66, 0.2); }
}

/* リンクホバーエフェクト */
a {
    position: relative;
    transition: color var(--transition-base);
}

a:not(.btn):not(.nav-link):not(.social-icon)::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width var(--transition-base);
}

a:not(.btn):not(.nav-link):not(.social-icon):hover::after {
    width: 100%;
}

/* ボタンのパルスエフェクト */
.btn:not(:disabled)::before {
    animation: pulse 2s infinite;
}

/* カードのホバーエフェクト */
.service-card,
.case-study-card,
.budget-card {
    transition: all var(--transition-smooth);
}

.service-card:hover,
.case-study-card:hover,
.budget-card:hover {
    animation: glow 2s ease-in-out;
}

/* アイコンのバウンスエフェクト */
.service-icon:hover,
.social-icon:hover {
    animation: bounce 0.5s ease-in-out;
}

/* フォーカス時のグローエフェクト */
.form-control:focus,
.btn:focus,
.nav-link:focus {
    animation: glow 1.5s ease-in-out;
}

/* セクションのフェードイン */
section {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease-out;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* モバイルでアニメーションを軽量化 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    section {
        opacity: 1;
        transform: none;
    }
}

/* 画像の遅延読み込み */
img[data-src] {
    filter: blur(10px);
    transition: filter var(--transition-slow);
}

img.loaded {
    filter: blur(0);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    color: var(--text-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-medium);
    z-index: 1000;
    box-shadow: var(--shadow-light);
    backdrop-filter: blur(20px);
}

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

.back-to-top:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: var(--shadow-medium);
}

/* ハイライト */
.highlight {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

/* レスポンシブデザイン */
@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        border-top: var(--border-glass);
        flex-direction: column;
        gap: 0;
        padding: 30px 20px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-medium);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-item {
        margin: 0;
        width: 100%;
    }

    .nav-link {
        display: block;
        width: 100%;
        text-align: center;
        margin-bottom: 10px;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }

    .services-container,
    .portfolio-container {
        grid-template-columns: 1fr;
    }

    .process-steps {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 30px;
    }

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

/* レスポンシブデザイン調整 */
@media (max-width: 1024px) {
    .hero-content {
        justify-content: center;
        padding: 0 var(--space-lg);
    }
    
    .hero-text {
        padding: var(--space-2xl);
        border-radius: var(--border-radius-lg);
        max-width: 500px;
    }
}

@media (max-width: 768px) {
    /* ヒーローセクションのモバイル対応 */
    .hero {
        min-height: 100vh;
        position: relative;
    }
    
    .hero-content {
        position: relative;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
        padding: var(--space-xl) var(--space-lg);
    }
    
    .hero-text {
        background: rgba(255, 255, 255, 0.95);
        padding: var(--space-xl);
        border-radius: var(--border-radius-md);
        margin: 0;
        max-width: 100%;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        text-align: center;
    }
    
    .hero-text h1 {
        font-size: clamp(1.5rem, 5vw, 2rem);
    }
    
    .hero-text p {
        font-size: var(--font-size-base);
    }
    
    .hero-image {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: 0;
    }
    
    .hero-image img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        object-position: center;
    }
    
    .hero-image::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, 
            rgba(0, 0, 0, 0.4) 0%, 
            rgba(0, 0, 0, 0.6) 100%);
        z-index: 1;
    }
    
    /* プログレスインジケーター */
    .progress-indicator {
        height: 2px;
    }
    
    /* ヘッダー */
    header {
        padding: var(--space-md) 0;
    }
    
    header.scrolled {
        padding: var(--space-sm) 0;
    }
    
    /* ヒーローセクション */
    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
        text-align: center;
    }

    .hero-text h1 {
        font-size: clamp(1.75rem, 5vw, 2.5rem);
    }
    
    .hero-text p {
        font-size: var(--font-size-base);
    }
    
    .hero-image {
        order: -1;
        max-width: 400px;
        margin: 0 auto;
    }
    
    
    /* セクション */
    section {
        padding: var(--space-4xl) 0;
    }

    .section-title {
        margin-bottom: 60px;
    }

    .section-title h2 {
        font-size: 2rem;
    }
    
    /* サービスタブ */
    .service-tabs {
        flex-direction: column;
        gap: 8px;
    }
    
    .tab-button {
        width: 100%;
        justify-content: center;
    }
    
    /* サービスカード */
    .service-card {
        padding: var(--space-xl);
    }
    
    /* 3D効果を無効化 */
    .service-card:hover {
        transform: translateY(-4px);
    }
    
    /* アイコンアニメーションを簡素化 */
    .service-card:hover .service-icon {
        transform: scale(1.05);
        animation: none;
    }
    
    .service-header {
        flex-direction: row;
        align-items: center;
        justify-content: flex-start;
        text-align: left;
    }
    
    .service-icon {
        margin: 0;
        flex-shrink: 0;
    }
    
    .service-header h3 {
        font-size: 1.1rem;
    }
    
    .price-badge {
        margin-left: 0;
        margin-top: 8px;
        display: inline-block;
    }
    
    /* 予算提案 */
    .budget-proposal {
        padding: 32px 20px;
    }
    
    .budget-cards {
        grid-template-columns: 1fr;
    }
    
    /* ケーススタディ */
    .achievements-summary {
        grid-template-columns: repeat(2, 1fr);
        padding: 32px 20px;
        gap: 24px;
    }
    
    .achievement-number {
        font-size: 2rem;
    }
    
    .case-study-card {
        grid-template-columns: 1fr;
    }
    
    .case-study-image {
        height: 250px;
    }
    
    .case-study-content {
        padding: 24px;
    }
    
    .case-study-header {
        flex-direction: column;
        text-align: center;
    }
    
    .case-study-header h3 {
        font-size: 1.5rem;
    }
    
    .tech-stack {
        justify-content: center;
    }
    
    .case-study-actions {
        flex-direction: column;
    }
    
    .case-study-actions .btn {
        min-width: 100%;
    }
    
    /* その他の実績 */
    .project-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .project-item {
        padding: 24px;
    }
    
    .project-item i {
        font-size: 2rem;
    }

    /* フォーム */
    .contact-form {
        padding: var(--space-xl);
        margin: 0 var(--space-md);
        border-radius: var(--border-radius-md);
    }
    
    .form-group {
        margin-bottom: var(--space-lg);
    }
    
    .form-control {
        padding: var(--space-sm) var(--space-md);
        font-size: 16px; /* iOSズーム防止 */
    }
    
    .form-feedback {
        font-size: var(--font-size-xs);
        bottom: -20px;
    }
    
    /* ボタン */
    .btn {
        padding: var(--space-sm) var(--space-lg);
        font-size: var(--font-size-base);
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
    }

    .process-steps {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

    /* ポートフォリオ */
    .portfolio-container {
        grid-template-columns: 1fr;
    }
    
    .case-study-card:hover {
        transform: translateY(-4px);
    }
    
    /* マイクロインタラクションの無効化 */
    .custom-cursor {
        display: none;
    }
    
    /* 動的背景の無効化 */
    #dynamic-bg {
        display: none;
    }
    
    /* パララックス効果の無効化 */
    [data-aos] {
        transition-duration: 0.5s !important;
    }
    
    /* Back to Topボタン */
    .back-to-top {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
        font-size: 1.2rem;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }

    .hero-text h1 {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }
    
    .hero-text h1 .highlight::after {
        display: none;
    }

    .section-title h2 {
        font-size: 1.8rem;
    }

    .btn {
        padding: var(--space-sm) var(--space-lg);
        font-size: var(--font-size-sm);
    }
    
    /* ナビゲーションリンク */
    .nav-link {
        padding: var(--space-sm) var(--space-md);
        font-size: var(--font-size-sm);
    }

    .back-to-top {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
        font-size: 1.2rem;
    }
}

/* アニメーション */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* AOS アニメーション用のカスタムスタイル */
[data-aos="fade-up"] {
    animation: fadeInUp 0.8s ease-out;
}

[data-aos="fade-down"] {
    animation: fadeInDown 0.8s ease-out;
}

[data-aos="fade-left"] {
    animation: fadeInLeft 0.8s ease-out;
}

[data-aos="fade-right"] {
    animation: fadeInRight 0.8s ease-out;
}

/* オーバーレイ */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 154, 86, 0.2);
    backdrop-filter: blur(10px);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-medium);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 成功・エラーメッセージ */
.success-message {
    background: rgba(0, 242, 254, 0.1);
    border: 1px solid rgba(0, 242, 254, 0.3);
    color: var(--success-color);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    backdrop-filter: blur(20px);
}

.error-message {
    background: rgba(245, 87, 108, 0.1);
    border: 1px solid rgba(245, 87, 108, 0.3);
    color: var(--warning-color);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    backdrop-filter: blur(20px);
}

/* ===== モダンなアニメーションとエフェクト ===== */

/* パフォーマンス向上のためのハードウェアアクセラレーション */
.gpu-accelerated {
    transform: translateZ(0);
    will-change: transform;
}

/* スムーズなスクロールアニメーション */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* カスタムカーソル */
.cursor-pointer {
    cursor: pointer;
}

/* ホバーエフェクトの改善 */
.interactive-element {
    transition: all var(--transition-medium);
    cursor: pointer;
}

.interactive-element:hover {
    transform: translateY(-2px);
}

/* フォーカスリング */
.focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--border-radius-small);
}

/* アクセシビリティ向上 */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* グロー効果 */
.glow-on-hover:hover {
    box-shadow: var(--shadow-glow);
}

/* スケールアニメーション */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.scale-in {
    animation: scaleIn 0.4s var(--transition-spring);
}

/* パルスアニメーション */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.pulse {
    animation: pulse 2s infinite;
}

/* スライドイン改善 */
@keyframes slideInModern {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-in-modern {
    animation: slideInModern 0.6s ease-out;
}

/* モダンなローディングアニメーション */
@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

.shimmer {
    background: linear-gradient(90deg, var(--background-card) 25%, var(--background-glass) 50%, var(--background-card) 75%);
    background-size: 200px 100%;
    animation: shimmer 1.5s infinite;
}

/* ===== モダンなアニメーション拡張 ===== */

/* スタガードアニメーション */
.stagger-animation > * {
    animation: slideInModern 0.6s ease-out both;
}

.stagger-animation > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-animation > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-animation > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-animation > *:nth-child(4) { animation-delay: 0.4s; }
.stagger-animation > *:nth-child(5) { animation-delay: 0.5s; }

/* パララックス効果 */
.parallax-element {
    transform: translateZ(0);
    will-change: transform;
}

/* 無限回転アニメーション */
@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.rotate-slow {
    animation: rotate 20s linear infinite;
}

/* モダンなボタンのリップル効果 */
.btn-ripple {
    position: relative;
    overflow: hidden;
}

.btn-ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width var(--transition-fast), height var(--transition-fast);
}

.btn-ripple:active::after {
    width: 300px;
    height: 300px;
}

/* バウンス入場アニメーション */
@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3) translateZ(0);
    }
    50% {
        opacity: 1;
        transform: scale(1.05) translateZ(0);
    }
    70% {
        transform: scale(0.9) translateZ(0);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateZ(0);
    }
}

.bounce-in {
    animation: bounceIn 0.75s var(--transition-bounce);
}

/* フェードとスライドを組み合わせた洗練されたアニメーション */
@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95) translateZ(0);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1) translateZ(0);
    }
}

.fade-slide-up {
    animation: fadeSlideUp 0.6s var(--transition-smooth);
}

/* モーフィングアニメーション */
@keyframes morph {
    0%, 100% {
        border-radius: var(--border-radius);
    }
    50% {
        border-radius: var(--border-radius-xl);
    }
}

.morph {
    animation: morph 4s ease-in-out infinite;
}

/* ===== パフォーマンス最適化 ===== */

/* ハードウェアアクセラレーション対応要素 */
.hero-image img,
.service-card,
.btn,
.nav-link {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* アニメーションのwill-change最適化 */
.hero-image:hover img,
.service-card:hover,
.btn:hover,
.nav-link:hover {
    will-change: transform, box-shadow, background-color;
}

/* アニメーション終了後のwill-change解除 */
.hero-image img:not(:hover),
.service-card:not(:hover),
.btn:not(:hover),
.nav-link:not(:hover) {
    will-change: auto;
}

/* GPU レイヤー最適化 */
.hero::before,
.hero::after,
.services::before {
    transform: translateZ(0);
    will-change: transform;
}

/* prefers-reduced-motion対応 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .hero::before,
    .hero::after {
        animation: none;
    }
}

/* プリロード用の透明アニメーション */
.preload-animation {
    opacity: 0;
    animation: fadeSlideUp 0.8s var(--transition-smooth) forwards;
}

/* モバイル改行制御 */
.mobile-break {
    display: none;
}

@media (max-width: 768px) {
    .mobile-break {
        display: block;
    }
}

/* モバイル向けの追加調整 */
@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 1.75rem;
        line-height: 1.2;
    }
    
    .hero-text p {
        font-size: 0.875rem;
        line-height: 1.6;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
        padding: 0.875rem 1.5rem;
        font-size: 0.95rem;
    }
}