.tool-fullwidth {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* Tool shell */
.text-tool {
    max-width: 100%;
    margin: 0 auto;
}

.text-tool.editor-section,
.editor-section.text-tool {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.text-tool .card:not(.result-card) {
    border: 1px solid var(--color-border, #e5e7eb);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.06));
    border-radius: var(--radius, 12px);
    background: var(--color-surface, #fff);
}

.text-tool .card-body {
    padding: 1.25rem 1.35rem;
}

.text-tool .card-title {
    color: var(--color-text, #1f2937);
    font-weight: 700;
    font-size: 1.05rem;
}

.text-tool .form-control,
.text-tool .form-select,
.text-tool .select-input,
.text-tool textarea {
    border-radius: 8px;
    border: 1px solid var(--color-border, #e5e7eb);
}

.text-tool .form-control:focus,
.text-tool .form-select:focus,
.text-tool textarea:focus {
    border-color: var(--color-primary, #0d9488);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.text-tool .btn-primary {
    background: var(--color-primary, #0d9488);
    border-color: var(--color-primary, #0d9488);
}

.text-tool .btn-primary:hover {
    background: var(--color-primary-hover, #0f766e);
    border-color: var(--color-primary-hover, #0f766e);
}

.text-tool .alert {
    border-radius: 10px;
}

[data-theme="dark"] .text-tool .card:not(.result-card) {
    background: var(--color-surface, #1f2937);
    border-color: var(--color-border, #374151);
}

[data-theme="dark"] .text-tool .card-title,
[data-theme="dark"] .text-tool .form-label,
[data-theme="dark"] .text-tool {
    color: var(--color-text, #f9fafb);
}

[data-theme="dark"] .text-tool .text-muted,
[data-theme="dark"] .text-tool .form-text {
    color: var(--color-text-secondary, #9ca3af) !important;
}

[data-theme="dark"] .text-tool .form-control,
[data-theme="dark"] .text-tool .form-select,
[data-theme="dark"] .text-tool textarea {
    background: #111827;
    color: var(--color-text, #f9fafb);
    border-color: var(--color-border, #374151);
}

/* --- tool: subscript-number --- */
.subscript-tool .result-box {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 0.375rem;
    padding: 0.75rem;
    min-height: 50px;
    font-family: 'Courier New', monospace;
    font-size: 16px;
    word-break: break-all;
}

.subscript-tool .subscript-result {
    background-color: #e3f2fd;
    border-color: #2196f3;
    font-size: 18px;
    font-weight: 500;
}

.subscript-tool .preview-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 0.5rem;
    padding: 1.5rem;
    text-align: center;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.subscript-tool .preview-text {
    color: white;
    font-size: 24px;
    font-weight: bold;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    font-family: 'Times New Roman', serif;
}

.subscript-tool .btn-outline-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,123,255,0.3);
    transition: all 0.2s ease;
}

.subscript-tool .form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.subscript-tool .card:not(.result-card) {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border: none;
    transition: box-shadow 0.3s ease;
}

.subscript-tool .card:hover {
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.subscript-tool .alert-info {
    background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%);
    border: none;
    border-radius: 0.5rem;
}

/* 下标字符样式 */
.subscript-char {
    font-size: 0.7em;
    vertical-align: sub;
    font-weight: normal;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .subscript-tool .preview-text {
        font-size: 20px;
    }
    
    .subscript-tool .result-box {
        font-size: 14px;
    }
}