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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #FFA500 0%, #FF6B35 100%);
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* ヘッダー */
.header {
    text-align: center;
    padding: 40px 20px;
    color: white;
}

.app-logo {
    width: 100px;
    height: 100px;
    margin-bottom: 20px;
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.app-name-logo {
    max-width: 200px;
    height: auto;
    margin-bottom: 15px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.app-name {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.app-tagline {
    font-size: 1.2rem;
    opacity: 0.95;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

/* セクション共通 */
section {
    background: white;
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

section h2 {
    color: #FF6B35;
    font-size: 1.5rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #FFE4D6;
}

/* アプリ紹介 */
.intro h3 {
    color: #FF6B35;
    font-size: 1.1rem;
    margin-top: 20px;
    margin-bottom: 10px;
}

.intro ul {
    margin: 15px 0;
    padding-left: 25px;
}

.intro li {
    margin-bottom: 8px;
    color: #555;
}

.intro li::marker {
    color: #FFA500;
}

.intro p {
    color: #555;
    margin-bottom: 10px;
}

/* ダウンロードセクション */
.download {
    text-align: center;
    background: linear-gradient(135deg, #FFF8F0 0%, #FFE4D6 100%);
}

.version-info {
    color: #666;
    margin-bottom: 20px;
}

.download-button {
    display: inline-block;
    background: linear-gradient(135deg, #FFA500 0%, #FF6B35 100%);
    color: white;
    padding: 18px 50px;
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.5);
}

.download-button:active {
    transform: translateY(0);
}

.file-size {
    margin-top: 15px;
    color: #888;
    font-size: 0.9rem;
}

/* インストール手順 */
.steps {
    margin: 20px 0;
}

.step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 25px;
}

.step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #FFA500 0%, #FF6B35 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin-right: 15px;
}

.step-content h3 {
    color: #333;
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.step-content p {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 5px;
}

.note {
    background: #FFF3E0;
    border-left: 4px solid #FFA500;
    padding: 15px;
    border-radius: 0 8px 8px 0;
    margin-top: 20px;
}

.note p {
    color: #E65100;
    font-size: 0.9rem;
    margin: 0;
}

/* フッター */
.footer {
    text-align: center;
    padding: 30px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

/* レスポンシブ対応 */
@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    .header {
        padding: 30px 15px;
    }

    .app-logo {
        width: 100px;
        height: 100px;
    }

    .app-name-logo {
        max-width: 220px;
    }

    .app-name {
        font-size: 2.2rem;
    }

    section {
        padding: 20px;
    }

    .download-button {
        padding: 15px 40px;
        font-size: 1.1rem;
    }

    .step {
        flex-direction: column;
    }

    .step-number {
        margin-bottom: 10px;
    }
}