/* =====================================================
   downgrade-page.css
   ダウングレードガイド専用スタイル (downgrade_guide_ja.html / downgrade_guide_en.html)
   ===================================================== */

/* CSS変数定義（旧来のインラインCSS変数の代替） */
:root {
    --primary: var(--color-header-bg);
    --secondary: var(--color-success-dark);
    --accent: var(--color-btn-primary);
    --text: var(--color-text-primary);
    --light-bg: var(--color-bg-base);
    --card-bg: var(--color-bg-base);
    --border: var(--color-border);
    --shadow: rgba(0, 0, 0, 0.1);
    --warning: var(--color-warning-dark);
    --error: #e74c3c;
    --info: #3b82f6;
}

/* ベースリセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
}

body {
    padding-top: 0;
    color: var(--text);
    background-color: var(--color-bg-base);
    line-height: 1.8;
}

/* ヘッダー関連 */
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo a:hover {
    opacity: 0.8;
}

.logo i {
    color: var(--color-success);
}

.lang-switch select {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.lang-switch select:hover {
    background: rgba(255, 255, 255, 0.3);
}

.lang-switch select option {
    background: var(--color-text-primary);
    color: white;
}

/* ページヘッダー */
.page-header {
    text-align: center !important;
    margin-bottom: 40px !important;
    padding: 40px 20px !important;
    background: var(--color-bg-secondary) !important;
    border-radius: 12px !important;
    box-shadow: 0 4px 20px var(--shadow) !important;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: #ffffff !important;
    text-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

.page-header h1 i {
    color: #ffffff !important;
}

.page-header p {
    font-size: 1.2rem;
    color: #f0f0f0 !important;
    text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

/* メインコンテンツ */
main {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}

/* コンテンツセクション */
.content-section {
    background: var(--color-bg-secondary);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--shadow);
    margin-bottom: 30px;
}

.content-section h2 {
    color: var(--primary);
    font-size: 28px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--warning);
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-section h3 {
    color: var(--warning);
    font-size: 22px;
    margin: 30px 0 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ステップコンテナ */
.step-container {
    margin: 30px 0;
}

.step {
    background: linear-gradient(135deg, var(--color-bg-surface) 0%, #e9ecef 100%);
    border-left: 5px solid var(--warning);
    padding: 25px;
    margin-bottom: 25px;
    border-radius: 8px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.step:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.2);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--warning);
    color: white;
    border-radius: 50%;
    font-weight: bold;
    font-size: 20px;
    margin-right: 15px;
    flex-shrink: 0;
}

.step-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.step-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary);
}

.step-content {
    margin-left: 55px;
    color: var(--color-text-secondary);
}

.step-content p {
    margin-bottom: 10px;
}

.step-content ul {
    margin-left: 20px;
    margin-top: 10px;
}

.step-content ul li {
    margin-bottom: 8px;
}

.step-image {
    margin-top: 15px;
    padding: 15px;
    background: var(--color-bg-secondary);
    border-radius: 8px;
    border: 2px dashed var(--color-border-dark);
    text-align: center;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* 警告ボックス */
.warning-box {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-left: 5px solid var(--warning);
    padding: 20px;
    margin: 25px 0;
    border-radius: 8px;
}

.warning-box h4 {
    color: #d97706;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
}

.warning-box p, .warning-box ul {
    color: var(--color-warning-dark);
}

.warning-box ul {
    margin-left: 20px;
    margin-top: 10px;
}

.warning-box ul li {
    margin-bottom: 8px;
}

/* 情報ボックス */
.info-box {
    background: linear-gradient(135deg, #e0f2fe 0%, #dbeafe 100%);
    border-left: 5px solid var(--info);
    padding: 20px;
    margin: 25px 0;
    border-radius: 8px;
}

.info-box h4 {
    color: var(--info);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
}

.info-box p, .info-box ul {
    color: #1e40af;
}

.info-box ul {
    margin-left: 20px;
    margin-top: 10px;
}

.info-box ul li {
    margin-bottom: 8px;
}

/* エラーボックス */
.error-box {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border-left: 5px solid var(--error);
    padding: 20px;
    margin: 25px 0;
    border-radius: 8px;
}

.error-box h4 {
    color: #dc2626;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
}

.error-box p, .error-box ul {
    color: #991b1b;
}

.error-box ul {
    margin-left: 20px;
    margin-top: 10px;
}

/* スクリーンショット */
.screenshot {
    background: var(--color-bg-secondary);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
    text-align: center;
}

.screenshot img {
    max-width: 100%;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.screenshot-caption {
    margin-top: 10px;
    color: var(--color-text-secondary);
    font-size: 14px;
    font-style: italic;
}

/* ボタン */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    margin-top: 15px;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(91, 124, 153, 0.4);
}

.btn-secondary {
    background: var(--color-bg-secondary);
    color: var(--primary);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--color-bg-surface);
    border-color: var(--warning);
}

/* ハイライト */
.highlight {
    background: linear-gradient(transparent 60%, #fef3c7 60%);
    font-weight: 600;
    padding: 0 4px;
}

/* パンくずリスト */
.breadcrumb {
    background: var(--color-bg-secondary);
    padding: 12px 20px;
    border-bottom: 1px solid var(--color-border);
}

.breadcrumb-container {
    max-width: 900px;
    margin: 0 auto;
}

.breadcrumb a {
    color: var(--color-btn-primary, var(--color-btn-primary));
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb span {
    color: var(--color-text-secondary);
    margin: 0 8px;
}

/* レスポンシブ */
@media (max-width: 768px) {
    /* スマホでは灰色背景を白に変更 */
    body {
        background-color: var(--color-bg-base);
    }

    /* コンテナの最大幅を解除 */
    .container {
        max-width: 100% !important;
    }

    .page-header {
        padding: 30px 20px;
    }

    .page-header h1 {
        font-size: 1.8rem;
    }

    .page-header p {
        font-size: 1rem;
    }

    .content-section {
        padding: 25px 20px;
    }

    .content-section h2 {
        font-size: 24px;
    }

    .step-content {
        margin-left: 0;
        margin-top: 15px;
    }
}