body {
    background-color: #f0f4f8;
}

.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    background: linear-gradient(145deg, #ffffff 0%, #e6f0f8 100%);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.08);
}

.card-header {
    background: linear-gradient(145deg, #4a90e2 0%, #6bb5ff 100%);
    border-bottom: none;
    border-radius: 15px 15px 0 0 !important;
    padding: 1.5rem 1rem;
    position: relative;
    overflow: hidden;
}

.card-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    pointer-events: none;
}

.card-header h2 {
    color: #ffffff;
    margin: 0;
    font-weight: 500;
    position: relative;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.card-body {
    background: linear-gradient(165deg, #ffffff 0%, #e6f0f8 100%);
    border-radius: 0 0 15px 15px;
    padding: 1.5rem;
}

.history-container {
    max-height: 700px;
    overflow-y: auto;
    padding: 0.5rem;
}

.history-container::-webkit-scrollbar {
    width: 8px;
}

.history-container::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.02);
    border-radius: 4px;
}

.history-container::-webkit-scrollbar-thumb {
    background: rgba(99, 102, 241, 0.2);
    border-radius: 4px;
}

.history-container::-webkit-scrollbar-thumb:hover {
    background: rgba(99, 102, 241, 0.3);
}

.history-item {
    border-radius: 10px;
    margin-bottom: 12px;
    background: linear-gradient(145deg, #ffffff 0%, #f8faff 100%);
    border: 1px solid rgba(99, 102, 241, 0.08);
    transition: all 0.2s ease;
    padding: 1rem;
    cursor: pointer;
}

.history-item:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.08);
    border-color: rgba(99, 102, 241, 0.15);
    background: linear-gradient(145deg, #f8faff 0%, #f0f7ff 100%);
}

.btn-group .btn {
    margin-left: 5px;
}

footer {
    padding: 30px;
    color: #64748b;
}

footer a {
    color: #64748b;
    transition: color 0.2s ease;
}

footer a:hover {
    color: #334155;
    text-decoration: none;
}

#audio {
    border-radius: 12px;
    width: 100%;
    margin-top: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.form-control {
    border-radius: 10px;
    border: 1px solid rgba(74, 144, 226, 0.15);
    transition: all 0.2s ease;
    background: #ffffff;
}

.form-control:focus {
    border-color: #6bb5ff;
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.12);
    background: #ffffff;
}

.btn {
    transition: all 0.2s ease;
    border-radius: 10px;
    font-weight: 500;
}

.btn-primary {
    background-color: #4a90e2;
    border-color: #4a90e2;
}

.btn-primary:hover {
    background-color: #357ab8;
    border-color: #357ab8;
}

.btn-info {
    background-color: #5bc0de;
    border-color: #5bc0de;
}

.btn-info:hover {
    background-color: #31b0d5;
    border-color: #31b0d5;
}

.btn-success {
    background-color: #5cb85c;
    border-color: #5cb85c;
}

.btn-success:hover {
    background-color: #4cae4c;
    border-color: #4cae4c;
}

.alert {
    border-radius: 10px;
    border: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

#loading {
    color: #6366f1;
}

.fa-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.btn-warning {
    background: linear-gradient(145deg, #fbbf24 0%, #f59e0b 100%);
    border: none;
    color: white;
}

.btn-warning:hover {
    background: linear-gradient(145deg, #f59e0b 0%, #d97706 100%);
    color: white;
}

/* 添加按钮点击反馈效果 */
.btn:active {
    transform: scale(0.98);
}

/* 优化表单控件悬停状态 */
.form-control:hover {
    border-color: rgba(74, 144, 226, 0.3);
}

/* 添加悬浮提示框样式 */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1050;
}

.toast {
    min-width: 200px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin-bottom: 10px;
    transition: all 0.3s ease;
    opacity: 0;
}

.toast.show {
    opacity: 1;
}

.toast-body {
    padding: 1rem;
    color: #fff;
    border-radius: 10px;
}

.toast-danger {
    background: linear-gradient(145deg, #ef4444 0%, #dc2626 100%);
}

.toast-warning {
    background: linear-gradient(145deg, #f59e0b 0%, #d97706 100%);
}

.toast-info {
    background: linear-gradient(145deg, #3b82f6 0%, #2563eb 100%);
}

.toast-loading {
    min-width: 300px;
}

.toast-loading .progress {
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    margin-top: 10px;
}

.toast-loading .progress-bar {
    background-color: #ffffff;
    transition: width 0.3s ease;
}

.toast-loading .fa-spinner {
    margin-right: 8px;
}