/* --- Phiên bản 5.7 - Thêm nút Tua câu & Tinh chỉnh CSS --- */
:root {
    --tts-bg-color: #f8f7fe;
    --tts-border-color: #e9e7f5;
    --tts-primary-color: #1abc9c;
    --tts-primary-hover-color: #16a085;
    --tts-text-color: #1e1e2d;
    --tts-text-muted-color: #6c757d;
    --tts-active-bg: #e9e7f5;
}
.truyen-tts-playlist-player, .truyen-tts-single-player-original {
    background-color: var(--tts-bg-color);
    border: 1px solid var(--tts-border-color);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    font-family: 'Nunito', sans-serif;
    color: var(--tts-text-color);
}
.tts-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}
.tts-header-title {
    font-weight: 700;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.tts-header-title .ri-volume-up-line { color: var(--tts-primary-color); }
.tts-header-actions {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    gap: 0.5rem;
}
.tts-action-btn {
    background-color: #fff;
    border: 1px solid var(--tts-border-color);
    color: var(--tts-text-muted-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    white-space: nowrap;
}
.tts-action-btn:hover { background-color: #f1f1f1; color: var(--tts-text-color); }
.tts-now-playing-info {
    text-align: center;
    padding: 1rem 0;
    margin-top: 1rem;
    border-top: 1px solid var(--tts-border-color);
    border-bottom: 1px solid var(--tts-border-color);
}
.now-playing-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--tts-text-color);
    margin: 0 0 0.5rem 0;
}
.now-playing-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.5rem 1.5rem;
    font-size: 0.9rem;
    color: var(--tts-text-muted-color);
}
.now-playing-meta span { display: flex; align-items: center; gap: 0.4rem; }
.tts-player { display: flex; justify-content: center; align-items: center; gap: 0.75rem; padding: 1rem 0 0.5rem 0; }
.tts-ctrl-btn { background: none; border: none; color: var(--tts-text-muted-color); cursor: pointer; display: flex; align-items: center; justify-content: center; padding: 0.25rem; transition: all 0.2s ease; }
.tts-ctrl-btn:hover:not(:disabled) { color: var(--tts-text-color); }
.tts-ctrl-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.tts-ctrl-btn.secondary i { font-size: 1.8rem; line-height: 1; display: block; }
.tts-ctrl-btn.small i { font-size: 1.2rem; line-height: 1; display: block; color: #999; }
.tts-ctrl-btn.small:hover:not(:disabled) i { color: var(--tts-text-color); }

.tts-ctrl-btn.play {
    background-color: var(--tts-primary-color); color: #fff; border-radius: 8px;
    padding: 0.75rem 1.5rem; font-size: 1rem; font-weight: 600; gap: 0.5rem;
}
.tts-ctrl-btn.play:hover:not(:disabled) { background-color: var(--tts-primary-hover-color); }
.tts-ctrl-btn.play i { font-size: 1.2rem; }
.tts-progress { text-align: center; font-size: 0.85rem; color: var(--tts-text-muted-color); margin-top: 0.5rem; height: 1em; }
.tts-playlist-container { max-height: 0; overflow-y: auto; transition: max-height 0.4s ease-in-out; }
.truyen-tts-playlist-player.playlist-open .tts-playlist-container { max-height: 400px; padding-top: 1rem; margin-top: 1rem; border-top: 1px solid var(--tts-border-color); }
.tts-playlist-nav { display: flex; gap: 0.5rem; padding: 0 0.75rem 1rem; border-bottom: 1px solid var(--tts-border-color); }
.tts-jumpto-input { width: 100%; border: 1px solid #ccc; border-radius: 6px; padding: 0.5rem; font-size: 1rem; text-align: center; }
.tts-jumpto-input::-webkit-outer-spin-button, .tts-jumpto-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.tts-jumpto-input[type=number] { -moz-appearance: textfield; }
.tts-jumpto-btn { white-space: nowrap; background-color: var(--tts-text-muted-color); color: #fff; border: none; border-radius: 6px; padding: 0 1rem; cursor: pointer; transition: background-color 0.2s; }
.tts-jumpto-btn:hover { background-color: var(--tts-text-color); }
#tts-playlist-items { max-height: calc(400px - 100px); overflow-y: auto; }
.tts-load-more { display: block; width: calc(100% - 1.5rem); margin: 1rem 0.75rem 0.75rem; padding: 0.75rem; text-align: center; background-color: #fff; border: 1px solid var(--tts-border-color); border-radius: 8px; font-weight: 600; color: var(--tts-text-muted-color); cursor: pointer; transition: background-color 0.2s; }
.tts-load-more:hover:not(:disabled) { background-color: var(--tts-active-bg); }
.tts-load-more:disabled { cursor: not-allowed; opacity: 0.7; }
.tts-playlist-item { padding: 0.75rem; border-radius: 8px; cursor: pointer; transition: background-color 0.2s ease; border-bottom: 1px solid var(--tts-border-color);}
.tts-playlist-item:last-child { border-bottom: none; }
.tts-playlist-item:hover { background-color: var(--tts-active-bg); }
.tts-playlist-item.active { background-color: var(--tts-active-bg); font-weight: 700; color: var(--tts-primary-color); }
.tts-playlist-item.last-listened .item-title { color: var(--tts-primary-color); font-weight: 600; }
.tts-playlist-item.last-listened .item-title::after { content: '(Đang nghe dở)'; font-size: 0.8em; font-weight: 400; color: var(--tts-text-muted-color); margin-left: 8px; }
.tts-playlist-item.active .item-title::after { content: '(Đang phát)'; color: var(--tts-primary-color); }
.tts-playlist-item .item-title { display: block; font-size: 0.95rem; }

.truyen-tts-single-player-original { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.truyen-tts-single-player-original .tts-player-group { display: flex; align-items: center; gap: 0.75rem; flex-grow: 1; }
.truyen-tts-single-player-original .tts-single-btn { background-color: var(--tts-primary-color); color: #fff; border: none; padding: 10px 16px; border-radius: 8px; cursor: pointer; font-size: 1rem; font-weight: 600; display: inline-flex; align-items: center; justify-content: center; gap: 8px; transition: background-color 0.2s; flex-grow: 1; }
.truyen-tts-single-player-original .tts-single-btn:hover { background-color: var(--tts-primary-hover-color); }
.truyen-tts-single-player-original .tts-single-btn i { font-size: 1.2em; }
.tts-settings-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.5); display: flex; justify-content: center; align-items: center; z-index: 99999; }
.tts-settings-modal { background: #fff; border-radius: 12px; width: 90%; max-width: 400px; box-shadow: 0 5px 20px rgba(0,0,0,0.2); overflow: hidden; }
.tts-settings-header { display: flex; justify-content: space-between; align-items: center; padding: 1rem; border-bottom: 1px solid var(--tts-border-color); }
.tts-settings-header h3 { margin: 0; font-size: 1.2rem; }
.tts-settings-close-btn { background: none; border: none; font-size: 2rem; cursor: pointer; color: #aaa; line-height: 1; padding: 0; }
.tts-settings-body { padding: 1.5rem; }
.tts-setting-group { margin-bottom: 1.5rem; }
.tts-setting-group:last-child { margin-bottom: 0; }
.tts-setting-group label { display: block; font-weight: 600; margin-bottom: 0.75rem; font-size: 0.95rem; }
.tts-settings-select, .tts-settings-slider { width: 100%; box-sizing: border-box; }
.tts-settings-select { padding: 0.6rem; border-radius: 6px; border: 1px solid #ccc; font-size: 1rem; }
input[type="range"].tts-settings-slider { -webkit-appearance: none; appearance: none; height: 8px; background: #ddd; border-radius: 5px; outline: none; }
input[type="range"].tts-settings-slider::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 20px; height: 20px; background: var(--tts-primary-color); border-radius: 50%; cursor: pointer; }
input[type="range"].tts-settings-slider::-moz-range-thumb { width: 20px; height: 20px; background: var(--tts-primary-color); border-radius: 50%; cursor: pointer; border: none; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.animate-spin { animation: spin 1s linear infinite; }
@media (max-width: 767px) {
    .tts-action-btn { width: 40px; height: 40px; padding: 0; border-radius: 50%; justify-content: center; gap: 0; }
    .tts-action-btn i { font-size: 1.2rem; margin: 0; }
    .tts-action-btn .tts-action-text { display: none; }
    .now-playing-title { font-size: 1.1rem; }
    .now-playing-meta { font-size: 0.8rem; gap: 0.5rem 1rem; }
    .truyen-tts-single-player-original .tts-single-btn { flex-grow: 0; }
}
@media (max-width: 480px) {
    .now-playing-meta { flex-direction: column; gap: 0.5rem; align-items: center; }
    .tts-player { gap: 0.5rem; }
}

.tts-highlight {
    background-color: #cce7ff;
    color: #004085;
    border-radius: 3px;
    padding: 1px 3px;
    transition: background-color 0.3s ease;
}
.tts-engine-tabs {
    display: flex;
    border: 1px solid var(--tts-border-color);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1rem;
}
.tts-engine-tab {
    flex-grow: 1;
    padding: 0.75rem;
    border: none;
    background-color: #fff;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--tts-text-muted-color);
    transition: all 0.2s ease;
}
.tts-engine-tab:not(:last-child) {
    border-right: 1px solid var(--tts-border-color);
}
.tts-engine-tab.active {
    background-color: var(--tts-active-bg);
    color: var(--tts-primary-color);
    font-weight: 700;
}
.tts-seek-group {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}
.tts-lazy-load-wrapper {
    text-align: center;
    margin: 1rem 0 2rem 0;
}
.tts-lazy-load-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: var(--tts-primary-color);
    color: #fff;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    transition: background-color 0.2s;
}
.tts-lazy-load-btn:hover:not(:disabled) {
    background-color: var(--tts-primary-hover-color);
}
.tts-lazy-load-btn:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}
.tts-lazy-load-btn i {
    font-size: 1.3em;
}

/* --- TỐI ƯU GIAO DIỆN SINGLE PLAYER (PHIÊN BẢN 25.2) --- */

.tts-close-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    width: 22px;
    height: 22px;
    background-color: rgba(0,0,0,0.1);
    color: var(--tts-text-muted-color);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: normal;
    cursor: pointer;
    z-index: 10;
    transition: all 0.2s ease;
}
.tts-close-btn:hover {
    background-color: #e74c3c;
    color: white;
    transform: scale(1.1);
}

.truyen-tts-single-player.hidden {
    display: none !important;
}

.tts-reopen-btn {
    position: fixed;
    bottom: 25px;
    right: 25px;
    width: 55px;
    height: 55px;
    background-image: linear-gradient(45deg, #1abc9c, #16a085);
    color: white;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    cursor: pointer;
    z-index: 99990;
    box-shadow: 0 5px 15px rgba(22, 160, 133, 0.4);
    transition: all 0.2s ease;
}
.tts-reopen-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 20px rgba(22, 160, 133, 0.5);
}

/* --- Giao diện cho Mobile (max-width: 767px) --- */
@media (max-width: 767px) {
    #truyen-tts-single-player-container {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        background-color: var(--tts-bg-color);
        border-top: 1px solid var(--tts-border-color);
        border-radius: 0;
        padding: 8px 15px;
        box-shadow: 0 -4px 15px rgba(0,0,0,0.08);
        z-index: 99998;
        display: flex;
        justify-content: space-between;
        align-items: center;
        transition: transform 0.3s ease-in-out;
    }

    #truyen-tts-single-player-container.hidden {
        transform: translateY(100%);
    }

    #truyen-tts-single-player-container .tts-controls-wrapper {
        flex-grow: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 15px;
        margin: 0 10px;
    }
    
    /* Giao diện nút bấm cho Play/Pause trên Mobile */
    #truyen-tts-single-player-container .tts-single-btn {
        flex-grow: 1; /* Cho nút Play chiếm nhiều không gian hơn */
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px; /* Khoảng cách giữa icon và chữ */
        height: 48px;
        border-radius: 24px; /* Bo tròn */
        border: none;
        background-image: linear-gradient(45deg, #1dd1a1, #1abc9c);
        color: white;
        box-shadow: 0 4px 10px rgba(29, 209, 161, 0.3);
        cursor: pointer;
        padding: 0 15px;
        font-size: 1rem;
        font-weight: 600;
    }
    #truyen-tts-single-player-container .tts-single-btn i {
        font-size: 1.5rem;
    }

    #truyen-tts-single-player-container .tts-ctrl-btn.small {
        color: #555;
    }
    #truyen-tts-single-player-container .tts-ctrl-btn.small i {
        font-size: 1.6rem;
    }
    
    #truyen-tts-single-player-container .tts-action-btn {
        width: 40px;
        height: 40px;
        padding: 0;
        border-radius: 50%;
        border: none;
        background: #e9e7f5;
        flex-shrink: 0;
    }
    
    #truyen-tts-single-player-container .tts-close-btn {
        display: none;
    }
}

/* --- Giao diện cho Desktop (min-width: 768px) --- */
@media (min-width: 768px) {
    #truyen-tts-single-player-container {
        position: fixed;
        bottom: 25px;
        right: 25px;
        background-color: var(--tts-bg-color);
        border: 1px solid var(--tts-border-color);
        border-radius: 50px; /* Bo tròn như viên thuốc */
        padding: 8px 12px;
        box-shadow: 0 8px 25px rgba(0,0,0,0.12);
        z-index: 99998;
        width: auto;
        display: flex;
        align-items: center;
        gap: 10px;
        transition: opacity 0.3s, transform 0.3s;
    }

    #truyen-tts-single-player-container.hidden {
        opacity: 0;
        transform: scale(0.8);
        pointer-events: none;
    }
    
    #truyen-tts-single-player-container .tts-controls-wrapper {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    /* Nút Play/Pause có cả icon và chữ */
    #truyen-tts-single-player-container .tts-single-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        border: none;
        border-radius: 30px;
        padding: 10px 20px;
        font-size: 0.95rem;
        font-weight: 600;
        white-space: nowrap;
        cursor: pointer;
        transition: all 0.25s ease;
        background-image: linear-gradient(45deg, #1dd1a1, #1abc9c);
        color: white;
        box-shadow: 0 4px 10px rgba(29, 209, 161, 0.3);
    }
    #truyen-tts-single-player-container .tts-single-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 15px rgba(29, 209, 161, 0.4);
    }
    #truyen-tts-single-player-container .tts-single-btn i {
        font-size: 1.2rem;
    }
    
    #truyen-tts-single-player-container .tts-ctrl-btn.small i {
        font-size: 1.5rem;
    }

    #truyen-tts-single-player-container .tts-action-btn {
        width: 44px;
        height: 44px;
        padding: 0;
        border-radius: 50%;
        border: none;
        background: rgba(0,0,0,0.03);
    }
    #truyen-tts-single-player-container .tts-action-btn:hover {
        background: rgba(0,0,0,0.06);
    }
    #truyen-tts-single-player-container .tts-action-btn i {
        font-size: 1.3rem;
    }
}