#niliu-tts-btn.active {
    color: var(--focus-color) !important;
    background: var(--focus-color-10, rgba(var(--focus-color-rgb), 0.1)) !important;
}

#niliu-tts-btn.active i {
    animation: niliu-tts-pulse 1.5s ease-in-out infinite;
}

@keyframes niliu-tts-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.niliu-tts-wrap {
    display: inline-flex;
    margin-right: 8px;
    margin-bottom: 8px;
    vertical-align: middle;
}

.niliu-tts-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    font-size: 13px;
    color: var(--muted-2-color);
    background: var(--main-bg-color);
    border: 1px solid var(--main-border-color);
    transition: all 0.2s;
    cursor: pointer;
}

.niliu-tts-btn:hover {
    color: var(--focus-color);
    border-color: var(--focus-color);
}

.niliu-tts-btn i {
    font-size: 14px;
}

.niliu-tts-panel {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 320px;
    background: var(--main-bg-color, #fff);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    z-index: 99999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.niliu-tts-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dark-theme .niliu-tts-panel {
    background: var(--main-bg-color, #1e1e1e);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.niliu-tts-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 18px;
    background: linear-gradient(135deg, var(--focus-color), var(--focus-color-dark, var(--focus-color)));
    color: #fff;
}

.niliu-tts-title {
    font-size: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.niliu-tts-title i {
    font-size: 16px;
}

.niliu-tts-close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    transition: all 0.2s;
}

.niliu-tts-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.niliu-tts-panel-body {
    padding: 18px;
}

.niliu-tts-progress-wrap {
    margin-bottom: 18px;
}

.niliu-tts-progress-bar {
    height: 6px;
    background: var(--main-border-color, #e5e5e5);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 8px;
}

.niliu-tts-progress-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--focus-color), var(--focus-color-dark, var(--focus-color)));
    border-radius: 3px;
    transition: width 0.3s ease;
}

.niliu-tts-progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--muted-2-color, #999);
}

#niliu-tts-status {
    font-weight: 500;
    color: var(--focus-color);
}

.niliu-tts-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--main-border-color, #e5e5e5);
}

.niliu-tts-ctrl-btn {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--body-bg-color, #f5f5f5);
    border: 2px solid transparent;
    border-radius: 50%;
    color: var(--muted-color, #666);
    font-size: 18px;
    cursor: pointer;
    transition: all 0.25s ease;
}

.niliu-tts-ctrl-btn:hover {
    background: var(--focus-color-10, rgba(var(--focus-color-rgb), 0.1));
    border-color: var(--focus-color);
    color: var(--focus-color);
    transform: scale(1.08);
}

.niliu-tts-ctrl-btn:active {
    transform: scale(0.95);
}

#niliu-tts-play:hover,
#niliu-tts-pause:hover {
    background: var(--focus-color);
    color: #fff;
}

.niliu-tts-setting {
    margin-bottom: 15px;
}

.niliu-tts-setting:last-child {
    margin-bottom: 0;
}

.niliu-tts-setting-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--muted-color, #666);
    margin-bottom: 8px;
}

.niliu-tts-setting-label i {
    font-size: 12px;
    color: var(--focus-color);
    width: 16px;
}

.niliu-tts-setting-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

.niliu-tts-setting-control input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--main-border-color, #e5e5e5);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.niliu-tts-setting-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--focus-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    transition: all 0.2s;
}

.niliu-tts-setting-control input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
}

.niliu-tts-setting-control input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--focus-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.niliu-tts-setting-control span {
    min-width: 45px;
    font-size: 13px;
    font-weight: 500;
    color: var(--focus-color);
    text-align: right;
}

.niliu-tts-select {
    flex: 1;
    min-width: 0;
    height: 36px;
    padding: 0 12px;
    background: var(--body-bg-color, #f5f5f5);
    border: 1px solid var(--main-border-color, #e5e5e5);
    border-radius: 6px;
    font-size: 13px;
    color: var(--color, #333);
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

.niliu-tts-select:hover,
.niliu-tts-select:focus {
    border-color: var(--focus-color);
}

.niliu-tts-panel-footer {
    padding: 12px 18px;
    background: var(--body-bg-color, #f5f5f5);
    border-top: 1px solid var(--main-border-color, #e5e5e5);
}

.niliu-tts-tip {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--muted-2-color, #999);
}

.niliu-tts-tip i {
    font-size: 11px;
}

.niliu-tts-highlight {
    background: linear-gradient(
        120deg,
        rgba(var(--focus-color-rgb, 255, 107, 107), 0.15) 0%,
        rgba(var(--focus-color-rgb, 255, 107, 107), 0.08) 100%
    );
    border-left: 3px solid var(--focus-color);
    padding-left: 12px;
    margin-left: -15px;
    border-radius: 0 6px 6px 0;
    transition: all 0.3s ease;
    position: relative;
}

.niliu-tts-highlight::before {
    content: '';
    position: absolute;
    left: -3px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--focus-color);
    animation: niliu-tts-glow 1.5s ease-in-out infinite;
}

@keyframes niliu-tts-glow {
    0%, 100% {
        box-shadow: 0 0 8px var(--focus-color);
    }
    50% {
        box-shadow: 0 0 15px var(--focus-color);
    }
}

@media (max-width: 768px) {
    .niliu-tts-panel {
        width: calc(100% - 30px);
        left: 15px;
        right: 15px;
        bottom: 70px;
    }

    .niliu-tts-controls {
        gap: 20px;
    }

    .niliu-tts-ctrl-btn {
        width: 52px;
        height: 52px;
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .niliu-tts-panel {
        bottom: 60px;
    }

    .niliu-tts-panel-body {
        padding: 15px;
    }

    .niliu-tts-setting-control span {
        min-width: 40px;
        font-size: 12px;
    }
}

@media print {
    .niliu-tts-panel,
    .niliu-tts-wrap,
    #niliu-tts-btn {
        display: none !important;
    }

    .niliu-tts-highlight {
        background: none !important;
        border: none !important;
        padding-left: 0 !important;
        margin-left: 0 !important;
    }
}