/* ===========================
   リセット & 基本設定
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット - AI/テック感のある未来的な配色 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --dark-gradient: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    
    --color-primary: #667eea;
    --color-secondary: #764ba2;
    --color-accent: #4facfe;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    
    --color-bg-dark: #0a0a0f;
    --color-bg-light: #ffffff;
    --color-surface: #1a1a2e;
    --color-surface-light: #f9fafb;
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #9ca3af;
    --color-text-dark: #1f2937;
    
    /* タイポグラフィ */
    --font-primary: 'Inter', 'Noto Sans JP', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 900;
    
    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* ボーダー */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    
    /* シャドウ */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.5);
    
    /* トランジション */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-dark);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===========================
   ナビゲーション
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: var(--shadow-lg);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.logo-image {
    height: 50px;
    width: auto;
    display: block;
    transition: var(--transition-base);
}

.logo-image:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

.logo i {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: var(--transition-fast);
    position: relative;
}

.nav-links a:not(.btn-primary-small):hover {
    color: var(--color-text-primary);
}

.nav-links a:not(.btn-primary-small)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: var(--transition-base);
}

.nav-links a:not(.btn-primary-small):hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===========================
   ヒーローセクション
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 120px;
    padding-bottom: var(--spacing-2xl);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.8) 0%, transparent 70%);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(118, 75, 162, 0.8) 0%, transparent 70%);
    top: 50%;
    right: -10%;
    animation-delay: 5s;
}

.orb-3 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(79, 172, 254, 0.6) 0%, transparent 70%);
    bottom: -10%;
    left: 40%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(102, 126, 234, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(102, 126, 234, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    animation: fadeInUp 1s ease-out;
    margin-top: var(--spacing-xl);
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.4); }
    50% { box-shadow: 0 0 0 10px rgba(102, 126, 234, 0); }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: var(--font-weight-black);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3xl);
}

.hero-images {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-2xl);
}

.hero-image-item {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    border: 3px solid rgba(102, 126, 234, 0.4);
    transition: var(--transition-base);
    animation: fadeInScale 1s ease-out;
}

.hero-image-large {
    max-width: 900px;
    width: 100%;
}

.hero-image-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 40px 80px rgba(102, 126, 234, 0.5);
    border-color: rgba(102, 126, 234, 0.8);
}

.hero-image-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition-slow);
}

.hero-image-item:hover img {
    transform: scale(1.02);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: var(--font-weight-black);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-text-secondary);
    border-radius: 20px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--color-text-secondary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 2s ease-in-out infinite;
}

@keyframes scrollWheel {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

/* ===========================
   ボタンスタイル
   =========================== */
.btn-primary,
.btn-secondary,
.btn-primary-small {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.btn-primary,
.btn-primary-small {
    background: var(--primary-gradient);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-lg);
}

.btn-primary::before,
.btn-primary-small::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: var(--transition-slow);
}

.btn-primary:hover::before,
.btn-primary-small:hover::before {
    left: 100%;
}

.btn-primary:hover,
.btn-primary-small:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

.btn-xlarge {
    padding: 1.25rem 2.5rem;
    font-size: 1.25rem;
    border-radius: var(--radius-lg);
}

/* ===========================
   セクション共通スタイル
   =========================== */
section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: var(--font-weight-black);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===========================
   YouTube動画セクション
   =========================== */
.video-section {
    background: var(--color-bg-dark);
    padding: var(--spacing-3xl) 0;
}

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

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 アスペクト比 */
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-xl);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    border: 3px solid rgba(102, 126, 234, 0.4);
    transition: var(--transition-base);
    background: var(--color-surface);
}

.video-wrapper:hover {
    border-color: rgba(102, 126, 234, 0.8);
    box-shadow: 0 40px 80px rgba(102, 126, 234, 0.5);
    transform: translateY(-5px);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-xl);
}

/* ===========================
   問題提起セクション
   =========================== */
.problem-section {
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-surface) 100%);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.problem-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.problem-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--secondary-gradient);
    transform: scaleX(0);
    transition: var(--transition-base);
}

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

.problem-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(102, 126, 234, 0.3);
    transform: translateY(-5px);
}

.problem-icon {
    width: 60px;
    height: 60px;
    background: var(--secondary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.problem-card h3 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.problem-card p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===========================
   機能紹介セクション
   =========================== */
.features-section {
    background: var(--color-surface);
    position: relative;
    overflow: hidden;
}

/* オーケストラホール風の背景 */
.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% 0%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 20% 100%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(79, 172, 254, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* ステージライト効果 */
.features-section::after {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 200%;
    background: 
        conic-gradient(from 0deg at 50% 0%, 
            transparent 0deg,
            rgba(102, 126, 234, 0.03) 60deg,
            transparent 120deg,
            rgba(118, 75, 162, 0.03) 180deg,
            transparent 240deg,
            rgba(79, 172, 254, 0.03) 300deg,
            transparent 360deg
        );
    animation: stageLight 20s linear infinite;
    pointer-events: none;
}

@keyframes stageLight {
    0% { transform: translateX(-50%) rotate(0deg); }
    100% { transform: translateX(-50%) rotate(360deg); }
}

.ai-orchestra-image {
    max-width: 1200px;
    margin: 0 auto var(--spacing-3xl);
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(102, 126, 234, 0.3);
    animation: fadeInScale 1s ease-out;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.ai-orchestra-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition-slow);
}

.ai-orchestra-image:hover img {
    transform: scale(1.02);
}

.ai-orchestra-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        180deg,
        transparent 0%,
        transparent 70%,
        rgba(10, 10, 15, 0.8) 100%
    );
    pointer-events: none;
    z-index: 1;
}

.image-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(102, 126, 234, 0.3);
    z-index: 2;
}

.image-caption i {
    font-size: 1.5rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.image-caption span {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

/* オーケストラ装飾要素 */
.orchestra-decorations {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

/* 音符アニメーション */
.music-note {
    position: absolute;
    font-size: 2rem;
    color: rgba(102, 126, 234, 0.15);
    animation: floatNote 15s ease-in-out infinite;
    opacity: 0;
}

.note-1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
    animation-duration: 12s;
}

.note-2 {
    top: 20%;
    right: 15%;
    animation-delay: 2s;
    animation-duration: 14s;
}

.note-3 {
    top: 40%;
    left: 5%;
    animation-delay: 4s;
    animation-duration: 16s;
}

.note-4 {
    top: 60%;
    right: 10%;
    animation-delay: 6s;
    animation-duration: 13s;
}

.note-5 {
    top: 80%;
    left: 20%;
    animation-delay: 1s;
    animation-duration: 15s;
}

.note-6 {
    top: 30%;
    left: 50%;
    animation-delay: 3s;
    animation-duration: 17s;
}

.note-7 {
    top: 70%;
    right: 30%;
    animation-delay: 5s;
    animation-duration: 14s;
}

.note-8 {
    top: 50%;
    right: 5%;
    animation-delay: 7s;
    animation-duration: 16s;
}

@keyframes floatNote {
    0% {
        opacity: 0;
        transform: translateY(0) rotate(0deg) scale(0.8);
    }
    10% {
        opacity: 0.3;
    }
    50% {
        opacity: 0.5;
        transform: translateY(-100px) rotate(180deg) scale(1.2);
    }
    90% {
        opacity: 0.3;
    }
    100% {
        opacity: 0;
        transform: translateY(-200px) rotate(360deg) scale(0.8);
    }
}

/* 音波ライン */
.wave-line {
    position: absolute;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%,
        rgba(102, 126, 234, 0.3) 20%,
        rgba(118, 75, 162, 0.3) 50%,
        rgba(79, 172, 254, 0.3) 80%,
        transparent 100%
    );
    animation: waveMove 8s ease-in-out infinite;
}

.wave-1 {
    top: 25%;
    left: -100%;
    width: 200%;
    animation-delay: 0s;
}

.wave-2 {
    top: 50%;
    left: -100%;
    width: 200%;
    animation-delay: 2s;
    opacity: 0.6;
}

.wave-3 {
    top: 75%;
    left: -100%;
    width: 200%;
    animation-delay: 4s;
    opacity: 0.4;
}

@keyframes waveMove {
    0% {
        left: -100%;
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        left: 100%;
        opacity: 0;
    }
}

/* コンテナのz-indexを上げて装飾の上に表示 */
.features-section .container {
    position: relative;
    z-index: 1;
}

.feature-block {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-3xl);
    align-items: center;
    margin-bottom: var(--spacing-3xl);
}

.feature-block.reverse {
    direction: rtl;
}

.feature-block.reverse .feature-content {
    direction: ltr;
}

.feature-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.feature-icon-large {
    width: 70px;
    height: 70px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
}

.feature-title {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
}

.feature-subtitle {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

.feature-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    font-size: 1.125rem;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-base);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(102, 126, 234, 0.3);
    transform: translateX(5px);
}

.feature-item-icon {
    width: 40px;
    height: 40px;
    background: rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
}

.feature-item p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.feature-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.dashboard-preview {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.dashboard-preview::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, rgba(102, 126, 234, 0.3), transparent 30%);
    animation: rotate 4s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.dashboard-card {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
}

.dashboard-card i {
    font-size: 3rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.dashboard-card span {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
}

/* ===========================
   ベネフィットセクション
   =========================== */
.benefits-section {
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg-dark) 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.benefit-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
    transition: var(--transition-base);
}

.benefit-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: var(--transition-base);
}

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

.benefit-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-2xl);
    border-color: rgba(102, 126, 234, 0.5);
}

.benefit-number {
    position: absolute;
    top: -20px;
    right: 20px;
    font-size: 6rem;
    font-weight: var(--font-weight-black);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.1;
    line-height: 1;
}

.benefit-icon {
    width: 80px;
    height: 80px;
    background: var(--accent-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.benefit-card h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.benefit-card p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.benefit-highlight {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    position: relative;
    z-index: 1;
}

/* ===========================
   ユースケースセクション
   =========================== */
.usecases-section {
    background: var(--color-bg-dark);
}

.usecases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.usecase-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
    transition: var(--transition-base);
}

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

.usecase-card:hover::after {
    transform: scaleX(1);
}

.usecase-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(102, 126, 234, 0.5);
}

.usecase-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--primary-gradient);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.usecase-icon {
    width: 70px;
    height: 70px;
    background: rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.usecase-card h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-lg);
}

.usecase-team {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.team-member {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    min-width: 80px;
}

.team-member i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.team-plus {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
    font-size: 1.25rem;
}

.usecase-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-primary);
}

.usecase-result {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(102, 126, 234, 0.1) 100%);
    border-radius: var(--radius-md);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.result-icon {
    width: 40px;
    height: 40px;
    background: rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-success);
    flex-shrink: 0;
}

.result-text {
    font-size: 0.875rem;
    line-height: 1.6;
}

.result-text strong {
    color: var(--color-success);
}

/* ===========================
   技術スタックセクション
   =========================== */
.tech-section {
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-surface) 100%);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.tech-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.tech-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(102, 126, 234, 0.3);
    transform: translateY(-5px);
}

.tech-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.tech-item h4 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.tech-item p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===========================
   CTAセクション
   =========================== */
.cta-section {
    background: var(--color-surface);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    animation: rotateBackground 30s linear infinite;
}

@keyframes rotateBackground {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: var(--font-weight-black);
    line-height: 1.3;
    margin-bottom: var(--spacing-lg);
}

.cta-description {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.cta-subdescription {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-2xl);
}

.cta-features {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.cta-feature i {
    color: var(--color-success);
}

/* ===========================
   フッター
   =========================== */
.footer {
    background: var(--color-bg-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
}

.footer-section-center {
    text-align: center;
    max-width: 600px;
}

.footer-section-center .footer-section {
    margin-top: var(--spacing-lg);
}

.footer-section-center .footer-section h4 {
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.footer-section-center .footer-section ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.footer-section-center .footer-section ul li a {
    font-size: 0.875rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
}

.footer-logo-image {
    height: 50px;
    width: auto;
    display: block;
}

.footer-logo i {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--color-text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    text-align: center;
}

/* ===========================
   レスポンシブデザイン
   =========================== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .hero-content {
        margin-top: var(--spacing-lg);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-images {
        grid-template-columns: 1fr;
    }
    
    .feature-block,
    .feature-block.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .benefits-grid,
    .usecases-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section-header {
        margin-bottom: var(--spacing-2xl);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .btn-xlarge {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1rem;
    }
}

/* ===========================
   アニメーション効果
   =========================== */
.fade-in {
    opacity: 0;
    animation: fadeIn 0.6s ease-out forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    animation: slideInLeft 0.6s ease-out forwards;
}

@keyframes slideInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    animation: slideInRight 0.6s ease-out forwards;
}

@keyframes slideInRight {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    animation: scaleIn 0.6s ease-out forwards;
}

@keyframes scaleIn {
    to {
        opacity: 1;
        transform: scale(1);
    }
}