/**
 * Display Mode Styles
 * TOEIC Vocabulary List - UI v1
 *
 * 表示モード切り替え機能のスタイル
 */

/* ==================== Display Mode Selector ==================== */

.display-mode-selector {
    /* Removed - using card-unified structure */
}

.display-mode-label {
    /* Removed - using card-label instead */
}

.display-mode-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.display-mode-btn {
    padding: 8px 16px;
    border: 2px solid var(--color-border, #e5e7eb);
    background-color: var(--color-bg-card, #ffffff);
    color: var(--color-text-secondary, #6b7280);
    border-radius: var(--radius-md, 8px);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s) ease;
    white-space: nowrap;
}

.display-mode-btn:hover {
    border-color: var(--color-primary, #3b82f6);
    color: var(--color-primary, #3b82f6);
    background-color: var(--color-primary-light, #eff6ff);
}

.display-mode-btn.active {
    background-color: var(--color-primary, #3b82f6);
    border-color: var(--color-primary-dark, #2563eb);
    color: white;
}

.display-mode-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

/* ==================== Content Visibility Classes ==================== */

/* 日本語コンテンツ */
.content-japanese {
    display: block;
    opacity: 1;
    transition: opacity var(--transition-base);
}

/* 英語コンテンツ */
.content-english {
    display: block;
    opacity: 1;
    transition: opacity var(--transition-base);
}

/* ==================== Display Mode: Japanese Only ==================== */

.mode-ja .content-english {
    display: none;
}

.mode-ja .content-japanese {
    display: block;
}

/* 日本語のみモード: 英語のTTSアイコンを非表示 */
.mode-ja .tts-icon[data-lang="en-US"] {
    display: none !important;
}

/* 単語ヘッダー（日本語モード） */
.mode-ja .word-main {
    /* 英単語は非表示、日本語を表示 */
}

.mode-ja .word-main::before {
    content: attr(data-japanese);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

/* ==================== Display Mode: English Only ==================== */

.mode-en .content-japanese {
    display: none;
}

.mode-en .content-english {
    display: block;
}

/* 英語のみモード: 日本語のTTSアイコンを非表示 */
.mode-en .tts-icon[data-lang="ja-JP"] {
    display: none !important;
}

/* ==================== Display Mode: Both ==================== */

.mode-both .content-japanese,
.mode-both .content-english {
    display: block;
}

/* 両方表示モードでの調整 */
.mode-both .meaning-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
}

.mode-both .word-main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.mode-both .word-main::after {
    content: attr(data-japanese);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-secondary);
}

/* ==================== Fade Animation ==================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(5px);
    }
}

.fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

.fade-out {
    animation: fadeOut var(--transition-base) ease-out;
}

/* ==================== Language Labels ==================== */

.language-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.language-label-en {
    color: var(--color-info);
}

.language-label-ja {
    color: var(--color-success);
}

/* ==================== Responsive Design ==================== */

@media (max-width: 768px) {
    .display-mode-selector {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
    }

    .display-mode-buttons {
        width: 100%;
        justify-content: space-between;
    }

    .display-mode-btn {
        flex: 1;
        text-align: center;
        padding: var(--spacing-sm);
        font-size: var(--font-size-xs);
    }

    .display-mode-label {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }
}

/* ==================== Print Styles ==================== */

@media print {
    .display-mode-selector {
        display: none;
    }

    /* 印刷時は両方表示 */
    .content-japanese,
    .content-english {
        display: block !important;
    }
}

/* ==================== Accessibility ==================== */

/* スクリーンリーダー用の視覚的な隠し方 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* キーボードフォーカスの強調 */
.display-mode-btn:focus-visible {
    outline: 3px solid var(--color-primary-light);
    outline-offset: 2px;
}

/* 動きを減らす設定 */
@media (prefers-reduced-motion: reduce) {
    .content-japanese,
    .content-english,
    .display-mode-btn {
        transition: none;
        animation: none;
    }

    .fade-in,
    .fade-out {
        animation: none;
    }
}

/* ==================== Loading State ==================== */

.display-mode-loading {
    opacity: 0.5;
    pointer-events: none;
}

.display-mode-loading .display-mode-btn {
    cursor: wait;
}

/* ==================== Mode Indicator (Optional) ==================== */

.mode-indicator {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

.mode-indicator-icon {
    font-size: var(--font-size-base);
}

/* ==================== Tooltip for Mode Buttons ==================== */

.display-mode-btn[title] {
    position: relative;
}

.display-mode-btn[title]:hover::after {
    content: attr(title);
    position: absolute;
    bottom: calc(100% + var(--spacing-xs));
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-bg-header);
    color: var(--color-text-inverse);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    z-index: var(--z-index-tooltip);
    pointer-events: none;
}