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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #fff;
    overflow-x: hidden;
}

/* ヘッダー */
header {
    padding: 20px 0;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    animation: slideDown 0.5s ease-out;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    background: linear-gradient(45deg, #00ff88, #00ccff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ヒーローセクション */
.hero {
    margin-top: 100px;
    padding: 80px 20px;
    text-align: center;
    position: relative;
}

.app-icon img {
    width: 120px;
    height: 120px;
    margin: 0 auto 30px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    animation: float 3s ease-in-out infinite;
}

h1 {
    font-size: 48px;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.app-store-badge {
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* スクリーンショット */
.screenshots {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.screenshot-container {
    display: flex;
    gap: 30px;
    overflow-x: auto;
    padding: 20px 0;
    scroll-snap-type: x mandatory;
}

.screenshot {
    min-width: 250px;
    height: 500px;
    background: linear-gradient(180deg, #1a1a2e, #16213e);
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    scroll-snap-align: center;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.screenshot:hover {
    transform: scale(1.05);
}

.screenshot-content {
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.mock-header {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    height: 40px;
    margin-bottom: 20px;
}

.mock-article {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 15px;
}

.mock-title {
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    margin-bottom: 10px;
}

.mock-text {
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin-bottom: 5px;
}

/* 機能セクション */
.features {
    padding: 80px 20px;
    background: rgba(0, 0, 0, 0.2);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
}

h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: inline-block;
    animation: pulse 2s infinite;
}

.feature-title {
    font-size: 24px;
    margin-bottom: 15px;
    font-weight: 600;
}

.feature-description {
    opacity: 0.9;
    line-height: 1.6;
}

/* CTA セクション */
.cta {
    padding: 100px 20px;
    text-align: center;
    background: linear-gradient(135deg, #ff6b6b, #feca57);
}

.cta h2 {
    font-size: 42px;
    margin-bottom: 30px;
}

.cta-description {
    font-size: 20px;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* フッター */
footer {
    padding: 40px 20px;
    background: rgba(0, 0, 0, 0.3);
    text-align: center;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: #fff;
    text-decoration: none;
    margin: 0 15px;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

/* アニメーション */
@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

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

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

/* パーティクル背景 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    animation: floatUp 15s infinite linear;
}

@keyframes floatUp {
    from {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    to {
        transform: translateY(-100vh) rotate(360deg);
        opacity: 0;
    }
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    h1 {
        font-size: 32px;
    }

    .subtitle {
        font-size: 18px;
    }

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

    .cta h2 {
        font-size: 32px;
    }
}