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

:root {
    /* カラーパレット */
    --primary-color: #6B4CE6;
    --primary-dark: #5538D4;
    --primary-light: #8B6EF5;
    --secondary-color: #FF6B9D;
    --accent-color: #4ECDC4;
    --success-color: #51CF66;
    --warning-color: #FFB84D;
    
    /* グレースケール */
    --gray-50: #F8F9FA;
    --gray-100: #F1F3F5;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-400: #CED4DA;
    --gray-500: #ADB5BD;
    --gray-600: #868E96;
    --gray-700: #495057;
    --gray-800: #343A40;
    --gray-900: #212529;
    
    /* テキストカラー */
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #868E96;
    --text-white: #FFFFFF;
    
    /* 背景カラー */
    --bg-white: #FFFFFF;
    --bg-light: #F8F9FA;
    --bg-gradient: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    --bg-gradient-alt: linear-gradient(135deg, #F093FB 0%, #F5576C 100%);
    
    /* シャドウ */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    
    /* ボーダー半径 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* スペーシング */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    
    /* トランジション */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* フォント */
    --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

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

/* ナビゲーション */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-icon {
    font-size: 32px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 6px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

/* ボタン */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: var(--radius-full);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--bg-gradient);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--bg-white);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
}

.btn-large {
    padding: 16px 48px;
    font-size: 18px;
}

/* ヒーローセクション */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(107, 76, 230, 0.1) 0%, transparent 70%);
    top: -200px;
    right: -100px;
    border-radius: 50%;
    animation: float 20s infinite ease-in-out;
}

.hero-background::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(78, 205, 196, 0.1) 0%, transparent 70%);
    bottom: -100px;
    left: -50px;
    border-radius: 50%;
    animation: float 15s infinite ease-in-out reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 50px) scale(1.1); }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease-out;
}

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

.hero-title {
    font-size: 48px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
}

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

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 1s ease-out;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.phone-mockup {
    width: 300px;
    height: 600px;
    border-radius: 40px;
    background: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    padding: 12px;
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: phoneFloat 6s infinite ease-in-out;
}

@keyframes phoneFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.phone-screen {
    width: 100%;
    height: 100%;
    background-color: var(--bg-white);
    border-radius: 32px;
    overflow: hidden;
    position: relative;
}

.mockup-content {
    padding: var(--spacing-md);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.mockup-header {
    text-align: center;
    padding: var(--spacing-sm) 0;
    font-size: 14px;
    font-weight: 600;
}

.mockup-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.shiro-character {
    font-size: 120px;
    margin-bottom: var(--spacing-md);
    animation: bounce 2s infinite;
}

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

.mockup-body h3 {
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.mockup-body p {
    font-size: 16px;
    color: var(--text-secondary);
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: 40px;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 機能セクション */
.features {
    background-color: var(--bg-light);
}

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

.feature-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.feature-list {
    list-style: none;
    margin-left: 0;
}

.feature-list li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 24px;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: 700;
}

/* 特徴セクション */
.benefits {
    background-color: var(--bg-white);
}

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

.benefit-item {
    text-align: center;
    padding: var(--spacing-lg);
    transition: transform var(--transition-base);
}

.benefit-item:hover {
    transform: scale(1.05);
}

.benefit-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-sm);
}

.benefit-item h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* 使い方セクション */
.how-it-works {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.03) 0%, rgba(118, 75, 162, 0.03) 100%);
}

.steps-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.step-item {
    flex: 1;
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-base);
}

.step-item:hover {
    transform: translateY(-8px);
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--bg-gradient);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto var(--spacing-md);
}

.step-content h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

.step-arrow {
    font-size: 32px;
    color: var(--primary-color);
    font-weight: 700;
}

/* 料金セクション */
.pricing {
    background-color: var(--bg-white);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background-color: var(--bg-white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    position: relative;
    transition: all var(--transition-base);
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.pricing-card.featured {
    border-color: var(--primary-color);
    border-width: 3px;
    box-shadow: var(--shadow-lg);
}

.plan-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-gradient);
    color: var(--text-white);
    padding: 6px 20px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 700;
}

.plan-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--gray-200);
}

.plan-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.plan-price {
    margin-bottom: var(--spacing-xs);
}

.price {
    font-size: 48px;
    font-weight: 900;
    color: var(--primary-color);
}

.period {
    font-size: 18px;
    color: var(--text-muted);
}

.plan-save {
    display: inline-block;
    background-color: var(--success-color);
    color: var(--text-white);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

.plan-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.plan-features li {
    padding: 12px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--gray-100);
}

.plan-features li:last-child {
    border-bottom: none;
}

.plan-features li.disabled {
    color: var(--text-muted);
    opacity: 0.5;
}

/* ダウンロードセクション */
.download {
    background: var(--bg-gradient);
    color: var(--text-white);
    text-align: center;
}

.download-content {
    max-width: 800px;
    margin: 0 auto;
}

.download-title {
    font-size: 40px;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
}

.download-description {
    font-size: 18px;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

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

.store-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    color: var(--text-white);
    text-decoration: none;
    transition: all var(--transition-base);
}

.store-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.store-icon svg {
    width: 32px;
    height: 32px;
}

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

.store-subtitle {
    font-size: 12px;
    opacity: 0.8;
}

.store-title {
    font-size: 18px;
    font-weight: 700;
}

.download-note {
    font-size: 14px;
    opacity: 0.8;
}

/* フッター */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    color: var(--text-white);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: var(--gray-400);
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-800);
    color: var(--gray-500);
}

/* レスポンシブデザイン */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-image {
        order: -1;
    }
    
    .phone-mockup {
        width: 250px;
        height: 500px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
        margin: var(--spacing-sm) 0;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-white);
        width: 100%;
        text-align: center;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-md) 0;
        gap: var(--spacing-sm);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
    }
    
    .hero-stats {
        justify-content: space-around;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .store-button {
        width: 100%;
        max-width: 300px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .phone-mockup {
        width: 220px;
        height: 440px;
    }
    
    .shiro-character {
        font-size: 80px;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
}

/* アニメーション */
.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* スクロールアニメーション用クラス */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}