/* Modern Dynamic CSS Reset & Design Tokens */
:root {
    --bg-color: #08090f;
    --card-bg: rgba(18, 20, 32, 0.6);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    
    --primary-grad: linear-gradient(135deg, #f9ed32 0%, #ee2a7b 50%, #d8019f 100%);
    --primary-glow: rgba(238, 42, 123, 0.4);
    
    --success-color: #10b981;
    --error-color: #ef4444;
    
    --font-heading: 'Outfit', 'Plus Jakarta Sans', system-ui, sans-serif;
    --font-body: 'Plus Jakarta Sans', system-ui, sans-serif;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    width: 100%;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
    position: relative;
    min-height: 100vh;
}

/* バックグラウンドオーラ効果 (Glow) */
.bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.15;
    z-index: -1;
    pointer-events: none;
}

.bg-glow-1 {
    top: -10%;
    right: -10%;
    background: radial-gradient(circle, #ee2a7b 0%, transparent 70%);
}

.bg-glow-2 {
    bottom: 20%;
    left: -10%;
    background: radial-gradient(circle, #d8019f 0%, transparent 70%);
}

/* コンテナ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ヘッダー */
.app-header {
    padding: 24px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    background: rgba(8, 9, 15, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    width: 36px;
    height: 36px;
    color: #ee2a7b;
}

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

.header-nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-smooth);
    font-size: 0.95rem;
}

.nav-link:hover {
    color: var(--text-primary);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

/* メインコンテンツ */
.main-content {
    min-height: calc(100vh - 200px);
}

/* ヒーローセクション */
.hero-section {
    padding: 80px 0 60px 0;
    text-align: center;
    position: relative;
}

.hero-title {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 3.5rem;
    line-height: 1.25;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px auto;
}

/* ダウンロードカード & フォーム */
.download-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: var(--border-radius-xl);
    padding: 32px;
    max-width: 860px;
    margin: 0 auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 
                inset 0 1px 1px rgba(255, 255, 255, 0.1);
    transition: var(--transition-smooth);
}

.download-card:focus-within {
    border-color: rgba(238, 42, 123, 0.3);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35), 
                0 0 20px rgba(238, 42, 123, 0.15),
                inset 0 1px 1px rgba(255, 255, 255, 0.1);
}

.download-form {
    display: flex;
    gap: 16px;
    width: 100%;
}

.input-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-lg);
    padding: 0 16px;
    transition: var(--transition-smooth);
}

.input-wrapper:focus-within {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
}

.link-icon {
    width: 24px;
    height: 24px;
    color: var(--text-secondary);
    margin-right: 12px;
}

#instagram-url {
    width: 100%;
    height: 56px;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-body);
}

#instagram-url::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.btn-paste {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    height: 38px;
    padding: 0 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-paste svg {
    width: 16px;
    height: 16px;
}

.btn-paste:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-submit {
    background: var(--primary-grad);
    border: none;
    color: white;
    padding: 0 36px;
    border-radius: var(--border-radius-lg);
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 20px var(--primary-glow);
    white-space: nowrap;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px var(--primary-glow), 0 0 15px rgba(249, 237, 50, 0.2);
}

.btn-submit:active {
    transform: translateY(0);
}

.arrow-icon {
    width: 20px;
    height: 20px;
    transition: var(--transition-smooth);
}

.btn-submit:hover .arrow-icon {
    transform: translateX(4px);
}

/* 美しいローダー */
.loader-container {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.spinner {
    width: 50px;
    height: 50px;
    position: relative;
}

.double-bounce1, .double-bounce2 {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-image: var(--primary-grad);
    opacity: 0.6;
    position: absolute;
    top: 0;
    left: 0;
    animation: sk-bounce 2.0s infinite ease-in-out;
}

.double-bounce2 {
    animation-delay: -1.0s;
}

@keyframes sk-bounce {
    0%, 100% { 
        transform: scale(0.0);
    } 50% { 
        transform: scale(1.0);
    }
}

.loader-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

/* エラーメッセージ */
.error-container {
    margin-top: 32px;
    padding: 16px 24px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--error-color);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    text-align: left;
}

.error-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

/* 解析結果表示エリア */
.result-container {
    margin-top: 48px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

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

.result-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-xl);
    padding: 24px;
    max-width: 860px;
    margin: 0 auto;
    text-align: left;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.25);
}

.result-header {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.result-thumbnail-wrapper {
    width: 140px;
    height: 140px;
    border-radius: 12px;
    overflow: hidden;
    background: #1e293b;
    position: relative;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.result-thumbnail {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.result-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.media-tag {
    align-self: flex-start;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    margin-bottom: 12px;
    letter-spacing: 0.05em;
}

.result-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

/* カルーセル用のグリッドレイアウト */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.media-item-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

.media-item-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.media-preview-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    background: #11131e;
    overflow: hidden;
}

.media-preview {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.media-type-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 4px;
}

.media-type-badge svg {
    width: 14px;
    height: 14px;
}

.media-action-area {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex-grow: 1;
    justify-content: flex-end;
}

/* グローバルダウンロードボタン */
.btn-download {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--primary-grad);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 15px rgba(238, 42, 123, 0.3);
    width: 100%;
}

.btn-download svg {
    width: 18px;
    height: 18px;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(238, 42, 123, 0.4);
}

/* 静的メディアダウンロード用（単一メディア） */
.single-media-download-area {
    display: flex;
    justify-content: flex-start;
}

.single-media-download-area .btn-download {
    width: auto;
}

/* 特徴セクション */
.features-section {
    padding: 100px 0;
    background: rgba(255, 255, 255, 0.01);
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 60px;
    letter-spacing: -0.01em;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    transition: var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.feature-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: rgba(238, 42, 123, 0.1);
    border: 1px solid rgba(238, 42, 123, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ee2a7b;
    margin-bottom: 24px;
}

.feature-icon-wrapper svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 使い方セクション */
.how-to-use-section {
    padding: 100px 0;
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.step-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-lg);
    padding: 40px 32px;
    position: relative;
    transition: var(--transition-smooth);
}

.step-card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.step-number {
    position: absolute;
    top: 24px;
    right: 32px;
    font-family: var(--font-heading);
    font-size: 4rem;
    font-weight: 900;
    line-height: 1;
    background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0.01) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    z-index: 2;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    position: relative;
    z-index: 2;
}

/* FAQセクション */
.faq-section {
    padding: 100px 0 140px 0;
    background: rgba(255, 255, 255, 0.01);
}

.faq-container {
    max-width: 860px;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.faq-item:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.faq-question {
    width: 100%;
    padding: 24px;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 600;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    gap: 16px;
}

.faq-arrow {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-answer p {
    padding: 0 24px 24px 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.faq-item.active .faq-arrow {
    transform: rotate(180deg);
}

/* フッター */
.app-footer {
    padding: 60px 0;
    background: #040508;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    text-align: center;
}

.copyright {
    font-weight: 500;
    color: var(--text-primary);
}

.disclaimer {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.3);
    max-width: 900px;
    line-height: 1.7;
}

/* モバイルレスポンシブ対応 */
@media (max-width: 991px) {
    .hero-title {
        font-size: 2.8rem;
    }
}

@media (max-width: 768px) {
    .app-header {
        padding: 16px 0;
    }
    
    .header-nav {
        display: none; /* スマホではナビゲーションを隠してクリーンに */
    }
    
    .hero-section {
        padding: 60px 0 40px 0;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .download-card {
        padding: 20px;
    }
    
    .download-form {
        flex-direction: column;
    }
    
    .btn-submit {
        height: 56px;
        justify-content: center;
    }
    
    .result-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .result-thumbnail-wrapper {
        width: 120px;
        height: 120px;
    }
    
    .result-info {
        align-items: center;
    }
    
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 40px;
    }
    
    .features-section, .how-to-use-section, .faq-section {
        padding: 60px 0;
    }
    
    .features-grid, .steps-container {
        gap: 20px;
    }
}

/* ユーティリティクラス */
.hidden {
    display: none !important;
}

/* ダウンロードボタンの状態アニメーション */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.btn-download:disabled {
    opacity: 0.7;
    cursor: wait;
    transform: none !important;
}

.btn-download-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%) !important;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4) !important;
}

/* button要素として使う場合のリセット */
button.btn-download {
    font-family: var(--font-body);
    border: none;
    outline: none;
}

/* ==========================================
   PWA & 広告プレースホルダー & ヘルプテキスト用追加スタイル
   ========================================== */

/* 広告プレースホルダー */
.ad-placeholder-container {
    margin: 32px auto 0 auto;
    max-width: 860px;
    width: 100%;
    background: rgba(255, 255, 255, 0.01);
    border: 1px dashed rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-lg);
    padding: 12px;
    text-align: center;
}

.ad-placeholder-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.2);
    letter-spacing: 0.1em;
    margin-bottom: 8px;
}

.ad-box {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.03);
}

/* PC用広告とスマホ用広告のCSSデバイス出し分け設定 */
.ad-sp-wrapper {
    display: none !important;
}

.ad-pc-wrapper {
    display: block !important;
    max-width: 100%;
    margin: 0 auto !important;
}

@media (max-width: 768px) {
    .ad-pc-wrapper {
        display: none !important;
    }
    .ad-sp-wrapper {
        display: block !important;
        max-width: 100%;
        margin: 0 auto !important;
    }
}


.ad-dummy-content {
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.85rem;
}

.ad-dummy-title {
    font-weight: 600;
    margin-bottom: 2px;
}

.ad-dummy-subtitle {
    font-size: 0.75rem;
}

/* ヘルプテキスト */
.result-footer-tip {
    margin-top: 24px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
}

.download-tip {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* PWA インストールボタン (Header Nav 用) */
.btn-install-nav {
    background: var(--primary-grad);
    border: none;
    outline: none;
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 10px rgba(238, 42, 123, 0.2);
}

.btn-install-nav:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(238, 42, 123, 0.3);
}

/* PWA 追加ガイドモーダル */
.pwa-guide-modal {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 380px;
    background: rgba(18, 20, 32, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: var(--border-radius-xl);
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 
                inset 0 1px 1px rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transform: translateY(100px) scale(0.9);
    opacity: 0;
    animation: slideUpIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes slideUpIn {
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.pwa-guide-content {
    position: relative;
    text-align: center;
}

.btn-close-pwa-guide {
    position: absolute;
    top: -8px;
    right: -8px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.btn-close-pwa-guide:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--error-color);
    border-color: rgba(239, 68, 68, 0.2);
}

.pwa-app-icon-wrapper {
    width: 68px;
    height: 68px;
    border-radius: 16px;
    overflow: hidden;
    margin: 0 auto 16px auto;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3), 0 0 15px rgba(255, 42, 116, 0.2);
}

.pwa-app-icon {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.pwa-guide-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
    font-family: var(--font-heading);
}

.pwa-guide-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.4;
}

.pwa-instructions {
    text-align: left;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 16px;
}

.pwa-step {
    font-size: 0.85rem;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.5;
}

.pwa-step:last-child {
    margin-bottom: 0;
}

.btn-install-pwa-action {
    background: var(--primary-grad);
    color: white;
    border: none;
    outline: none;
    width: 100%;
    padding: 12px;
    border-radius: var(--border-radius-lg);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(238, 42, 123, 0.3);
    transition: var(--transition-smooth);
    margin-bottom: 8px;
    text-align: center;
}

.btn-install-pwa-action:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(238, 42, 123, 0.4);
}

.pwa-step-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

/* スマホ表示での調整 */
@media (max-width: 480px) {
    /* 広告枠の左右パディングを縮小し、300pxバナーが枠内へ完璧に収まるように余白を確保 */
    .ad-placeholder-container {
        padding: 12px 4px;
        width: 100%;
        box-sizing: border-box;
    }
    
    .ad-box {
        padding: 0;
        width: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .ad-box > * {
        max-width: 100% !important;
        margin: 0 auto !important;
    }

    .pwa-guide-modal {
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        border-radius: 24px 24px 0 0;
        border-bottom: none;
        padding: 24px 20px;
        animation: slideUpInMobile 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    }
    
    @keyframes slideUpInMobile {
        to {
            transform: translateY(0);
            opacity: 1;
        }
    }
}