.settings-panel textarea {
    width: 100%;
    min-height: 80px;
    padding: 14px 16px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    background: var(--surface-2);
    color: var(--text-primary);
    font-size: 0.875rem;
    line-height: 1.7;
    resize: vertical;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.settings-panel textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-subtle);
}

.settings-panel textarea::placeholder {
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.instrumental-option {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.instrumental-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.instrumental-checkbox input[type="checkbox"] {
    display: none;
}

.instrumental-checkbox .checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-subtle);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    background: var(--surface-2);
}

.instrumental-checkbox input[type="checkbox"]:checked + .checkmark {
    background: var(--primary);
    border-color: var(--primary);
}

.instrumental-checkbox input[type="checkbox"]:checked + .checkmark::after {
    content: '鉁?;
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.instrumental-badge {
    font-size: 0.625rem;
    color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.instrumental-notice {
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: 8px;
    padding: 12px 14px;
    margin-bottom: 12px;
    animation: fadeIn 0.3s ease;
}

.instrumental-notice p {
    margin: 0;
    font-size: 0.8125rem;
    color: #92400e;
    line-height: 1.6;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.char-count {
    float: right;
    font-size: 0.6875rem;
    color: var(--text-muted);
    font-weight: normal;
    letter-spacing: 0.02em;
}

.optional-tag {
    font-size: 0.625rem;
    color: var(--text-muted);
    background: var(--surface-2);
    padding: 2px 8px;
    border-radius: 999px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.example-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
    align-items: center;
}

.example-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.example-btn {
    font-size: 0.6875rem;
    padding: 5px 12px;
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    background: var(--surface-1);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.example-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-subtler);
    transform: translateY(-1px);
}

.example-btn:active {
    transform: translateY(0);
}

.lyrics-tags-guide {
    margin-top: 12px;
    border-top: 1px solid var(--hairline);
    padding-top: 10px;
}

.guide-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 4px 0;
    transition: color 0.15s;
}

.guide-toggle:hover {
    color: var(--text-secondary);
}

.guide-toggle .guide-arrow {
    transition: transform 0.2s;
    margin-left: auto;
}

.guide-toggle.open .guide-arrow {
    transform: rotate(180deg);
}

.guide-content {
    display: none;
    padding-top: 10px;
    animation: slideDown 0.2s ease;
}

.guide-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
    border-bottom: 1px solid var(--hairline);
}

.guide-item:last-child {
    border-bottom: none;
}

.guide-item code {
    font-size: 0.6875rem;
    padding: 2px 8px;
    background: var(--surface-2);
    border-radius: 4px;
    color: var(--primary);
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
}

.guide-item div {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.guide-item strong {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.guide-item span {
    font-size: 0.6875rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.settings-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    cursor: pointer;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    user-select: none;
    font-weight: 500;
    border-top: 1px solid var(--hairline);
    margin-top: 4px;
}

.settings-toggle svg {
    transition: transform 0.3s ease;
    color: var(--text-muted);
}

.settings-toggle.open svg {
    transform: rotate(180deg);
}

.advanced-settings {
    padding-top: 12px;
    animation: slideDown 0.2s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes alertSlideIn {
    from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.action-buttons {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

#generate-btn {
    flex: 1;
    min-height: 48px;
    padding: 0 24px;
    border: none;
    border-radius: var(--radius-lg);
    background: var(--primary);
    color: #fff;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 4px 14px rgba(204, 82, 0, 0.25);
    letter-spacing: 0.02em;
}

.history-btn {
    min-height: 48px;
    padding: 0 16px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    background: var(--surface-1);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.history-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-subtler);
}

#generate-btn:hover {
    background: var(--primary-hover);
    box-shadow: 0 8px 24px rgba(204, 82, 0, 0.35);
    transform: translateY(-1px);
}

#generate-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px var(--primary-subtle);
}

#generate-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

#generate-btn svg {
    flex-shrink: 0;
}

.result-area {
    display: flex;
    flex-direction: column;
    padding: 0;
}

.result-panel {
    margin-top: 20px;
    background: var(--surface-1);
    border-radius: var(--radius-xl);
    border: 1px solid var(--hairline);
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

.audio-player {
    width: 100%;
    padding: 24px;
    background: var(--surface-1);
    border-radius: var(--radius-lg);
    border: 1px solid var(--hairline);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.audio-player audio {
    width: 100%;
    height: 48px;
    border-radius: var(--radius-md);
}

.audio-info {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 12px;
    text-align: center;
    font-weight: 500;
}

.audio-actions {
    display: flex;
    justify-content: center;
    margin-top: 16px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-lg);
    background: var(--surface-2);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--border-subtle);
}

.download-btn:hover {
    background: var(--primary-subtler);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-1px);
}

.download-btn:active {
    transform: translateY(0);
}

.download-btn svg {
    flex-shrink: 0;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--surface-1);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 560px;
    max-height: 80vh;
    overflow: hidden;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--hairline);
}

.modal-header h2 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

.close-btn {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
}

.close-btn:hover {
    color: var(--text-primary);
}

.btn {
    padding: 6px 14px;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.15s;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--surface-2);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
    background: var(--surface-3);
}

.btn-danger {
    background: #ef4444;
    color: #fff;
    font-size: 0.75rem;
    padding: 4px 10px;
}

.btn-danger:hover {
    background: #dc2626;
}

.history-list {
    max-height: calc(80vh - 70px);
    overflow-y: auto;
    padding: 12px;
}

.history-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.history-item {
    background: var(--surface-2);
    border-radius: var(--radius-lg);
    padding: 14px;
    margin-bottom: 10px;
    border: 1px solid var(--hairline);
}

.history-item h4 {
    font-size: 0.8125rem;
    font-weight: 600;
    margin: 0 0 6px 0;
    color: var(--text-primary);
}

.history-meta {
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.history-text {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 4px;
}

.history-lyrics {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 10px;
}

.history-player {
    margin: 10px 0;
}

.history-player audio {
    width: 100%;
    height: 36px;
    border-radius: var(--radius-md);
}

.player-status {
    display: inline-block;
    font-size: 0.6875rem;
    padding: 2px 8px;
    border-radius: 4px;
    margin-top: 4px;
}

.player-status.checking {
    color: var(--text-muted);
    background: var(--surface-2);
}

.player-status.expired {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.history-actions {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}

@media (max-width: 768px) {
    .settings-panel textarea {
        min-height: 70px;
        padding: 12px 14px;
        font-size: 0.8125rem;
    }

    #generate-btn {
        min-height: 44px;
        font-size: 0.875rem;
    }

    .example-btn {
        font-size: 0.625rem;
        padding: 4px 10px;
    }

    .audio-player {
        padding: 16px;
    }

    .download-btn {
        padding: 8px 20px;
        font-size: 0.8125rem;
    }

    .result-panel {
        margin-top: 16px;
        padding: 16px;
    }

    .history-btn span {
        display: none;
    }

    .history-btn {
        padding: 0 12px;
        min-width: 44px;
    }
}