/**
 * Floating Menu Styles
 * TOEIC Vocabulary List - UI v1
 *
 * 2段構成：
 * - 上段：言語切替
 * - 下段：ナビゲーション（前の単語、次の単語、トップへ）
 */

/* Floating Menu Container */
.floating-menu {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: linear-gradient(to top, rgba(255, 255, 255, 0.98), rgba(255, 255, 255, 0.95));
    backdrop-filter: blur(12px);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    border-top: 2px solid var(--color-border);
    width: 100%;
    /* アニメーション用 */
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.floating-menu-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* 上段：言語切替 */
.floating-language-row {
    display: flex;
    gap: 8px;
    justify-content: center;
    align-items: center;
}

/* 下段：ナビゲーション */
.floating-navigation-row {
    display: flex;
    gap: 8px;
    justify-content: center;
    align-items: center;
}

/* 言語切替ボタン */
.floating-lang-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    background-color: var(--color-bg-card);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    min-height: 44px;
    flex: 1;
    max-width: 140px;
}

.floating-lang-btn:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.15);
}

.floating-lang-btn.active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.floating-lang-btn .lang-icon {
    font-size: 20px;
    line-height: 1;
}

.floating-lang-btn .lang-label {
    font-size: 14px;
    font-weight: 600;
}

/* ナビゲーションボタン */
.floating-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 12px 16px;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 56px;
    min-width: 80px;
    flex: 1;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.floating-nav-btn:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.floating-nav-btn:active:not(:disabled) {
    background-color: var(--color-primary-dark);
    box-shadow: 0 1px 4px rgba(37, 99, 235, 0.2);
}

.floating-nav-btn:disabled {
    background-color: var(--color-secondary);
    color: var(--color-text-light);
    cursor: not-allowed;
    opacity: 0.5;
    box-shadow: none;
}

.nav-icon {
    font-size: 24px;
    line-height: 1;
    font-weight: bold;
}

.nav-label {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* トップへボタン専用スタイル */
.floating-nav-btn[id="scrollToTopBtn"] {
    background-color: var(--color-success);
}

.floating-nav-btn[id="scrollToTopBtn"]:hover:not(:disabled) {
    background-color: #059669;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

/* Responsive Design - Tablet */
@media (max-width: 768px) {
    .floating-menu-content {
        padding: 10px 12px;
        gap: 8px;
    }

    .floating-lang-btn {
        padding: 8px 16px;
        font-size: 14px;
        min-height: 42px;
        flex: 1;
    }

    .floating-lang-btn .lang-icon {
        font-size: 18px;
    }

    .floating-lang-btn .lang-label {
        font-size: 13px;
    }

    .floating-nav-btn {
        padding: 10px 12px;
        min-height: 52px;
        min-width: 70px;
    }

    .nav-icon {
        font-size: 22px;
    }

    .nav-label {
        font-size: 11px;
    }
}

/* Responsive Design - Mobile */
@media (max-width: 480px) {
    .floating-menu-content {
        padding: 8px 8px;
        gap: 6px;
    }

    .floating-language-row {
        gap: 6px;
    }

    .floating-navigation-row {
        gap: 6px;
    }

    .floating-lang-btn {
        padding: 8px 12px;
        min-height: 44px;
        gap: 4px;
    }

    .floating-lang-btn .lang-icon {
        font-size: 20px;
    }

    .floating-lang-btn .lang-label {
        font-size: 12px;
    }

    .floating-nav-btn {
        padding: 10px 8px;
        min-height: 56px;
        min-width: 0;
        flex: 1;
    }

    .nav-icon {
        font-size: 24px;
    }

    .nav-label {
        font-size: 10px;
    }
}

/* Add padding to body to prevent content from being hidden behind floating menu */
body {
    padding-bottom: 140px;
}

@media (max-width: 768px) {
    body {
        padding-bottom: 130px;
    }
}

@media (max-width: 480px) {
    body {
        padding-bottom: 130px;
    }
}

/* Dark Mode Support */
[data-theme="dark"] .floating-menu {
    background: rgba(17, 24, 39, 0.98);
    backdrop-filter: blur(12px);
    border-top-color: rgba(75, 85, 99, 0.4);
}

[data-theme="dark"] .floating-lang-btn {
    background-color: rgba(55, 65, 81, 0.9);
    border-color: rgba(75, 85, 99, 0.5);
    color: rgba(243, 244, 246, 0.95);
}

[data-theme="dark"] .floating-lang-btn:hover {
    background-color: rgba(75, 85, 99, 0.9);
    border-color: rgba(107, 114, 128, 0.7);
}

[data-theme="dark"] .floating-lang-btn.active {
    background-color: rgba(59, 130, 246, 0.9);
    border-color: rgba(59, 130, 246, 0.8);
    color: white;
}

[data-theme="dark"] .floating-nav-btn {
    background-color: rgba(59, 130, 246, 0.85);
}

[data-theme="dark"] .floating-nav-btn:hover:not(:disabled) {
    background-color: rgba(37, 99, 235, 0.9);
}

[data-theme="dark"] .floating-nav-btn[id="scrollToTopBtn"] {
    background-color: rgba(16, 185, 129, 0.85);
}

[data-theme="dark"] .floating-nav-btn[id="scrollToTopBtn"]:hover:not(:disabled) {
    background-color: rgba(5, 150, 105, 0.9);
}

/* Animation */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.floating-menu.show {
    animation: slideUp 0.3s ease-out;
}