/* ==========================================================================
   HTML to Markdown Converter - Tool-Specific Styles
   
   IMPORTANT: The design system already provides:
   - All colors via CSS variables
   - Nav, hero, buttons, inputs, file upload zones
   - Section spacing and layout
   
   DO NOT:
   - Add background colors to .input-section or .output-section
   - Add borders to sections
   - Add padding to sections (use input-group for internal spacing)
   - Override design system colors
   ========================================================================== */

/* === TAB BUTTONS === */
.tab-buttons {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tab-button {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    flex: 1;
}

.tab-button:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.tab-button.tab-active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* === PREVIEW AREA === */
.preview-container {
    min-height: 200px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Empty state */
.preview-empty {
    text-align: center;
    color: var(--text-tertiary);
}

.preview-empty p {
    font-size: 14px;
}

/* Result display */
.preview-result {
    width: 100%;
}

.preview-result .text-area {
    background: transparent;
    border: none;
    resize: vertical;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 13px;
    line-height: 1.4;
    color: var(--text-primary);
}

.preview-result .text-area:focus {
    outline: none;
}

/* === OUTPUT ACTIONS === */
.output-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.output-actions .button-secondary,
.output-actions .button-download {
    flex: 1;
}

/* === PRO FEATURES === */
.pro-features {
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    margin-top: var(--space-xl);
}

.pro-features h4 {
    margin: 0 0 var(--space-sm) 0;
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
}

.pro-features p {
    margin: 0 0 var(--space-lg) 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.pro-feature-buttons {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.pro-feature-buttons .button-secondary {
    flex: 1;
}

.pro-feature-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.pro-detail-item {
    font-size: 13px;
    color: var(--text-tertiary);
    line-height: 1.4;
}

.pro-detail-item strong {
    color: var(--text-secondary);
}

/* === ERROR STATES === */
.input-error {
    color: var(--color-error, #ef4444);
    font-size: 13px;
    margin-top: var(--space-xs);
}

.input-group.has-error .text-input,
.input-group.has-error .text-area {
    border-color: var(--color-error, #ef4444);
}

/* === LOADING STATES === */
.button-primary.is-loading .button-text {
    visibility: hidden;
}

.button-primary.is-loading .button-spinner {
    display: block;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.button-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.button-primary {
    position: relative;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .tab-buttons {
        flex-direction: column;
    }
    
    .output-actions {
        flex-direction: column;
    }
    
    .pro-feature-buttons {
        flex-direction: column;
    }
    
    .preview-container {
        min-height: 150px;
        padding: var(--space-md);
    }
}