/* リセット & ベーススタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット */
    --primary-color: #5B7FE8;
    --primary-dark: #4A66C7;
    --primary-light: #E8EFFF;
    --secondary-color: #FF6B6B;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --text-light: #999999;
    --background: #FFFFFF;
    --background-light: #F8F9FA;
    --border-color: #E5E5E5;

    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* フォントサイズ */
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;

    /* ボーダー半径 */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;

    /* シャドウ */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    overflow-x: hidden;
}

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

.language-switcher {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #fff;
    backdrop-filter: blur(6px);
    box-shadow: var(--shadow-md);
}

.lang-link {
    color: inherit;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.55rem;
    border-radius: 999px;
    transition: background 0.2s ease, color 0.2s ease;
}

.lang-link:hover {
    background: rgba(255, 255, 255, 0.18);
}

.lang-link.active {
    background: #fff;
    color: var(--primary-dark);
}

.language-switcher .separator {
    opacity: 0.75;
}

/* ヒーローセクション */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-xl) 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    position: relative;
    z-index: 1;
}

.app-branding {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.app-icon {
    width: 100px;
    height: 100px;
    border-radius: 22%;
    box-shadow: var(--shadow-xl);
    animation: fadeInScale 0.8s ease-out;
}

.app-name {
    font-size: 3.5rem;
    font-weight: 900;
    color: white;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.02em;
}

.hero-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

.highlight {
    color: #FFD93D;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: #2A2A2A;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background-color: transparent;
    color: white;
    border-color: white;
    transform: translateY(-2px);
}

.btn-icon {
    width: 24px;
    height: 24px;
}

.btn span {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.btn small {
    font-size: 0.65rem;
    font-weight: 400;
    opacity: 0.8;
}

.btn strong {
    font-size: 0.95rem;
    font-weight: 600;
}

.coming-soon {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    background: #1A1A1A;
    border-radius: 2.5rem;
    padding: 1rem;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

/* ノッチは削除（スクリーンショット画像に既に含まれているため） */
/* .phone-mockup::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    height: 25px;
    background: #1A1A1A;
    border-radius: 0 0 1rem 1rem;
    z-index: 2;
} */

.screenshot {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 1.5rem;
}

/* 特徴セクション */
.features {
    padding: var(--spacing-xl) 0;
    background-color: var(--background-light);
}

.section-title {
    text-align: center;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.feature-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

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

.feature-description {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* スクリーンショットセクション */
.screenshots {
    padding: var(--spacing-xl) 0;
    background: white;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

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

.screenshot-img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    background: var(--background-light);
    aspect-ratio: 9 / 19.5;
    object-fit: cover;
}

.screenshot-caption {
    margin-top: var(--spacing-md);
    font-weight: 600;
    color: var(--text-secondary);
}

/* 使い方セクション */
.how-it-works {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.step {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    flex: 1;
    min-width: 250px;
    max-width: 300px;
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: 0 auto var(--spacing-md);
}

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

.step-description {
    color: var(--text-secondary);
}

.step-arrow {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    font-weight: 700;
}

/* CTAセクション */
.cta {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.cta-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

.cta .cta-buttons {
    justify-content: center;
}

/* フッター */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: var(--text-light);
}

.footer-heading {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-light);
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2rem;
        --font-size-2xl: 1.5rem;
        --font-size-xl: 1.25rem;
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }

    .language-switcher {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        padding: 0.35rem 0.75rem;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-lg) 0;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .app-branding {
        justify-content: center;
        text-align: center;
    }

    .app-icon {
        width: 80px;
        height: 80px;
    }

    .app-name {
        font-size: 2.5rem;
    }

    .hero-image {
        order: -1;
    }

    .phone-mockup {
        width: 250px;
        height: 500px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .screenshots-grid {
        grid-template-columns: 1fr;
    }

    .steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .app-branding {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .app-icon {
        width: 70px;
        height: 70px;
    }

    .app-name {
        font-size: 2rem;
    }

    .phone-mockup {
        width: 200px;
        height: 400px;
    }

    .btn {
        padding: 0.75rem 1.25rem;
        font-size: var(--font-size-sm);
    }

    .btn-icon {
        width: 20px;
        height: 20px;
    }
}

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

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

.hero-title {
    animation-delay: 0.1s;
}

.hero-subtitle {
    animation-delay: 0.2s;
}

.cta-buttons {
    animation-delay: 0.3s;
}

/* アクセシビリティ */
.btn:focus,
a:focus {
    outline: 3px solid var(--primary-light);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}