/* ============================================
 * AI语音合成模块(TTS) - Nebula 主题重新设计
 * 玻璃拟态 · 紫蓝渐变 · 高级质感
 * ============================================ */

.ai-tts-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px;
}

/* 页面头部 */
.tts-header {
    text-align: center;
    margin-bottom: 40px;
}

.tts-header h2 {
    font-size: 32px;
    font-weight: 700;
    margin: 0 0 12px 0;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.tts-header p {
    color: var(--text-secondary);
    font-size: 15px;
    opacity: 0.7;
}

/* 生成表单 - 玻璃拟态卡片 */
.tts-form {
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 28px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-card);
}

.tts-form .form-group {
    margin-bottom: 20px;
}

.tts-form label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.tts-form textarea,
.tts-form input,
.tts-form select {
    width: 100%;
    padding: 16px 20px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 15px;
    transition: all var(--transition);
}

.tts-form textarea:focus,
.tts-form input:focus,
.tts-form select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--bg-hover);
}

.tts-form textarea {
    min-height: 120px;
    resize: vertical;
}

/* 生成按钮 - 渐变流动 */
.tts-form .generate-btn {
    width: 100%;
    padding: 18px;
    background: var(--gradient-primary);
    background-size: 200% 200%;
    animation: gradient-flow 3s ease infinite;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.01em;
}

@keyframes gradient-flow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.tts-form .generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.tts-form .generate-btn:active {
    transform: translateY(0);
}

/* 选项行 */
.tts-form .options-row {
    display: flex;
    gap: 16px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.tts-form .option-item {
    flex: 1;
    min-width: 150px;
}

/* 语音列表 */
.tts-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* 语音卡片 - 玻璃拟态 */
.result-audio {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

.result-audio:hover {
    border-color: var(--border-glow);
    background: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* 播放按钮 - 渐变光晕 */
.audio-play-btn {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
    box-shadow: var(--shadow);
}

.audio-play-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-glow);
}

.audio-play-btn.playing {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--border-glow); }
    50% { box-shadow: 0 0 0 12px transparent; }
}

/* 音频信息 */
.audio-info {
    flex: 1;
    min-width: 0;
}

.audio-info .audio-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.audio-info .audio-meta {
    font-size: 13px;
    color: var(--text-muted);
}

/* 音频波形可视化 */
.audio-waveform {
    display: flex;
    align-items: center;
    gap: 3px;
    height: 40px;
    margin: 0 16px;
}

.audio-waveform .bar {
    width: 4px;
    background: linear-gradient(to top, var(--primary-light), var(--accent));
    border-radius: 2px;
    animation: waveform 1s ease-in-out infinite;
}

.audio-waveform .bar:nth-child(1) { height: 20%; animation-delay: 0s; }
.audio-waveform .bar:nth-child(2) { height: 40%; animation-delay: 0.1s; }
.audio-waveform .bar:nth-child(3) { height: 60%; animation-delay: 0.2s; }
.audio-waveform .bar:nth-child(4) { height: 80%; animation-delay: 0.3s; }
.audio-waveform .bar:nth-child(5) { height: 100%; animation-delay: 0.4s; }
.audio-waveform .bar:nth-child(6) { height: 80%; animation-delay: 0.5s; }
.audio-waveform .bar:nth-child(7) { height: 60%; animation-delay: 0.6s; }
.audio-waveform .bar:nth-child(8) { height: 40%; animation-delay: 0.7s; }
.audio-waveform .bar:nth-child(9) { height: 20%; animation-delay: 0.8s; }

@keyframes waveform {
    0%, 100% { transform: scaleY(0.5); }
    50% { transform: scaleY(1); }
}

.audio-waveform.playing .bar {
    animation-play-state: running;
}

/* 操作按钮 */
.audio-actions {
    display: flex;
    gap: 10px;
}

.audio-actions .action-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.audio-actions .action-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-glow);
    color: var(--primary-light);
    transform: translateY(-2px);
}

/* 音频播放器 - 玻璃拟态 */
.audio-player {
    width: 100%;
    margin: 16px 0;
    padding: 16px;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.audio-player audio {
    width: 100%;
    height: 40px;
}

/* 下载按钮 */
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--bg-glass);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
    margin-top: 20px;
}

.download-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-glow);
    color: var(--primary-light);
    transform: translateY(-2px);
}

/* 加载动画 */
.loading-spinner {
    width: 48px;
    height: 48px;
    margin: 40px auto;
    border: 3px solid var(--border-light);
    border-top-color: var(--primary-light);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 空状态 */
.tts-empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.tts-empty .empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

/* 响应式 */
@media (max-width: 640px) {
    .ai-tts-container {
        padding: 16px;
    }

    .result-audio {
        flex-wrap: wrap;
        gap: 12px;
    }

    .audio-waveform {
        display: none;
    }

    .audio-actions {
        width: 100%;
        justify-content: flex-end;
    }
}