#in-app {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    background-color: #0f172a;
    border: 1px solid #334155;
    padding: 2.5rem;
    font-family: "Inter", sans-serif;
}

/* パスワード表示エリア */
.password-display-area {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

#generated-password {
    flex-grow: 1;
    background: #0a0c10;
    border: 2px solid #3b82f6;
    color: #60a5fa;
    padding: 1rem 1.5rem;
    font-size: 1.5rem;
    font-family: 'Roboto Mono', monospace;
    letter-spacing: 0.1em;
    text-align: center;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.2);
    outline: none;
}

.icon-btn {
    background: #1e293b;
    border: 1px solid #334155;
    color: #f8fafc;
    padding: 0 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s;
    white-space: nowrap;
}

.icon-btn:hover {
    background: #334155;
    border-color: #60a5fa;
}

.icon-btn.success {
    background: #10b981;
    border-color: #059669;
    color: #ffffff;
}

/* 設定エリア */
.password-settings {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    padding: 1.5rem;
    background: rgba(30, 41, 59, 0.3);
    border: 1px solid #1e293b;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.group-label, .setting-group label {
    font-size: 0.85rem;
    color: #94a3b8;
    font-weight: bold;
    font-family: 'Roboto Mono', monospace;
}

.highlight-text {
    color: #60a5fa;
    font-size: 1.2rem;
}

/* スライダーのデザイン */
input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    margin-top: -8px;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}
input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: #334155;
    border-radius: 2px;
}

/* チェックボックス */
.checkbox-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    color: #cbd5e1;
    font-size: 0.95rem;
}

.check-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: #3b82f6;
    cursor: pointer;
}

/* ボタン */
.action-area {
    display: flex;
    justify-content: center;
}

.card-link {
    display: inline-flex;
    padding: 1rem 3rem;
    background: transparent;
    color: #3b82f6;
    font-size: 1rem;
    font-weight: bold;
    border: 1px solid #3b82f6;
    cursor: pointer;
    text-transform: uppercase;
    transition: all 0.2s;
}

.card-link:hover {
    background: #3b82f6;
    color: #ffffff;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
}

/* SEOコンテンツエリア */
.seo-content-area { max-width: 800px; margin: 4rem auto 0; color: #cbd5e1; text-align: left;}
.seo-content-area h2 { font-size: 1.5rem; color: #f8fafc; border-left: 4px solid #3b82f6; padding-left: 1rem; margin-bottom: 1.5rem; }
.seo-content-area p { line-height: 1.8; margin-bottom: 2rem; font-size: 0.95rem; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.feature-card { background: rgba(15, 23, 42, 0.4); border: 1px solid #334155; padding: 1.5rem; transition: all 0.3s ease; }
.feature-card:hover { border-color: #3b82f6; background: rgba(59, 130, 246, 0.05); }
.feature-card h3 { color: #60a5fa; margin-bottom: 0.8rem; font-size: 1.1rem; }
.feature-card p { margin-bottom: 0; font-size: 0.9rem; color: #94a3b8; line-height: 1.6;}