/* Base64 Converter - Complete Styles with Light/Dark Theme Support */

/* ===== CSS Variables ===== */
.b64-converter-tool {
    --b64-primary: var(--primary-color, #3498db);
    --b64-secondary: var(--secondary-color, #2ecc71);
    --b64-bg: var(--card-bg-color, #fcfcfc);
    --b64-surface: var(--background-color, #ffffff);
    --b64-text: var(--text-color, #333333);
    --b64-text-muted: #6c757d;
    --b64-border: var(--border-color, rgba(52, 152, 219, 0.1));
    --b64-shadow: var(--box-shadow, 0 4px 6px rgba(0, 0, 0, 0.1));
    --b64-radius: var(--border-radius-md, 8px);
    --b64-radius-lg: var(--border-radius-lg, 16px);
    --b64-transition: var(--transition-fast, 0.2s ease);
    --b64-gradient: linear-gradient(135deg, var(--b64-primary), var(--b64-secondary));
    --b64-success: #27ae60;
    --b64-warning: #f39c12;
    --b64-danger: #e74c3c;
    --b64-info: #3498db;
}

.dark-theme .b64-converter-tool {
    --b64-text-muted: #9ca3af;
    --b64-surface: #1a1d24;
    --b64-bg: #242830;
}

/* ===== Base Container ===== */
.b64-converter-tool {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
    font-family: var(--font-family, 'Inter', sans-serif);
    color: var(--b64-text);
}

/* ===== Header ===== */
.b64-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--secondary-rgb), 0.05));
    border-radius: var(--b64-radius-lg);
    border: 1px solid rgba(var(--primary-rgb), 0.15);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.b64-header-content {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.b64-header-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--b64-gradient);
    border-radius: var(--b64-radius-lg);
    font-size: 1.75rem;
    color: white;
    box-shadow: 0 8px 24px rgba(var(--primary-rgb), 0.35);
}

.b64-header-text h2 {
    margin: 0 0 0.25rem 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--b64-text);
}

.b64-header-text p {
    margin: 0;
    opacity: 0.7;
    font-size: 0.9rem;
    color: var(--b64-text);
}

.b64-header-actions {
    display: flex;
    gap: 0.5rem;
}

.b64-btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--b64-border);
    border-radius: 12px;
    background: var(--b64-surface);
    color: var(--b64-text);
    cursor: pointer;
    transition: all 0.3s ease;
}

.b64-btn-icon:hover {
    border-color: var(--b64-primary);
    color: var(--b64-primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.b64-btn-icon.active {
    background: var(--b64-primary);
    color: white;
    border-color: var(--b64-primary);
}

.b64-btn-icon:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== Privacy Notice ===== */
.b64-privacy-notice {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--b64-radius);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.1), rgba(52, 152, 219, 0.1));
    border: 1px solid rgba(39, 174, 96, 0.2);
    color: var(--b64-success);
}

.dark-theme .b64-privacy-notice {
    background: rgba(39, 174, 96, 0.15);
}

/* ===== Buttons ===== */
.b64-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--b64-radius);
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--b64-transition);
    text-decoration: none;
}

.b64-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.b64-btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    border-radius: 6px;
    border: 1px solid var(--b64-border);
    background: var(--b64-surface);
    color: var(--b64-text);
    cursor: pointer;
    transition: var(--b64-transition);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.b64-btn-sm:hover {
    border-color: var(--b64-primary);
    color: var(--b64-primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.b64-btn-primary {
    background: var(--b64-gradient);
    color: #fff !important;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.b64-btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.b64-btn-secondary {
    background: var(--b64-bg);
    color: var(--b64-text);
    border: 2px solid var(--b64-border);
}

.b64-btn-secondary:hover:not(:disabled) {
    background: rgba(var(--primary-rgb), 0.1);
    border-color: var(--b64-primary);
}

.b64-btn-outline {
    background: transparent;
    color: var(--b64-primary);
    border: 2px solid var(--b64-primary);
}

.b64-btn-outline:hover:not(:disabled) {
    background: var(--b64-primary);
    color: #fff;
}

/* ===== Educational Panel ===== */
.b64-learn-panel {
    display: none;
    background: var(--b64-bg);
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius-lg);
    margin-bottom: 1.5rem;
    overflow: hidden;
    animation: b64SlideDown 0.3s ease;
}

.b64-learn-panel.active {
    display: block;
}

@keyframes b64SlideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.b64-learn-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: rgba(var(--primary-rgb), 0.08);
    border-bottom: 1px solid var(--b64-border);
    font-weight: 600;
    color: var(--b64-primary);
}

.b64-learn-header i:first-child {
    font-size: 1.25rem;
}

.b64-close-learn {
    margin-left: auto;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--b64-text);
    opacity: 0.6;
    transition: all 0.2s;
    padding: 0.5rem;
}

.b64-close-learn:hover {
    opacity: 1;
    color: var(--b64-primary);
}

.b64-learn-content {
    padding: 1.5rem;
}

.b64-learn-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.b64-step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: rgba(var(--primary-rgb), 0.03);
    border-radius: 12px;
    border: 1px solid rgba(var(--primary-rgb), 0.1);
}

.b64-step-number {
    width: 32px;
    height: 32px;
    min-width: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--b64-primary);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
}

.b64-step-content h4 {
    margin: 0 0 0.25rem 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--b64-text);
}

.b64-step-content p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--b64-text-muted);
}

/* Character Table */
.b64-char-table-section {
    margin-top: 1.5rem;
}

.b64-char-table-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem 0;
    font-size: 1rem;
    color: var(--b64-text);
}

.b64-char-table-wrapper {
    overflow-x: auto;
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
}

.b64-char-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.75rem;
}

.b64-char-table th,
.b64-char-table td {
    padding: 0.5rem;
    text-align: center;
    border: 1px solid var(--b64-border);
}

.b64-char-table th {
    background: rgba(var(--primary-rgb), 0.1);
    font-weight: 600;
    color: var(--b64-primary);
}

.b64-char-table td {
    background: var(--b64-surface);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
}

.b64-char-table td.b64-char-index {
    background: rgba(var(--primary-rgb), 0.05);
    font-weight: 600;
    color: var(--b64-text-muted);
}

.b64-char-table td.b64-char-value {
    font-weight: 700;
    color: var(--b64-primary);
    font-size: 0.9rem;
}

/* Step View Section */
.b64-step-view-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--b64-border);
}

.b64-step-view-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem 0;
    font-size: 1rem;
    color: var(--b64-text);
}

.b64-step-view {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.b64-step-view-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--b64-surface);
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
}

.b64-step-view-label {
    min-width: 120px;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--b64-text-muted);
}

.b64-step-view-value {
    flex: 1;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.9rem;
    color: var(--b64-primary);
    word-break: break-all;
}

/* ===== Main Tabs ===== */
.b64-main-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.5rem;
    background: var(--b64-bg);
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
}

.b64-main-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--b64-text-muted);
    border-radius: var(--b64-radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--b64-transition);
    white-space: nowrap;
}

.b64-main-tab:hover {
    background: var(--b64-surface);
    color: var(--b64-text);
}

.b64-main-tab.active {
    background: var(--b64-gradient);
    color: #fff;
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.3);
}

/* ===== Panels ===== */
.b64-panel {
    display: none;
    background: var(--b64-bg);
    border-radius: var(--b64-radius-lg);
    border: 1px solid var(--b64-border);
    padding: 1.5rem;
}

.b64-panel.active {
    display: block;
    animation: b64FadeIn 0.3s ease;
}

@keyframes b64FadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Dual Panel Layout ===== */
.b64-dual-panel {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 1.5rem;
}

@media (max-width: 992px) {
    .b64-dual-panel {
        grid-template-columns: 1fr;
    }

    .b64-options-sidebar {
        order: -1;
    }
}

/* ===== IO Container ===== */
.b64-io-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* ===== Input/Output Sections ===== */
.b64-input-section,
.b64-output-section {
    background: var(--b64-surface);
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
    overflow: hidden;
}

.b64-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-bottom: 1px solid var(--b64-border);
}

.b64-section-header h3 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--b64-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.b64-section-header h3 i {
    color: var(--b64-primary);
}

.b64-section-actions {
    display: flex;
    gap: 0.35rem;
}

/* Textarea Wrapper */
.b64-textarea-wrapper {
    position: relative;
}

.b64-textarea-wrapper textarea,
.b64-converter-tool textarea {
    width: 100%;
    min-height: 180px;
    padding: 1rem;
    border: none;
    background: var(--b64-surface);
    color: var(--b64-text);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
}

.dark-theme .b64-textarea-wrapper textarea,
.dark-theme .b64-converter-tool textarea {
    background: #1a1d24;
}

.b64-textarea-wrapper textarea:focus,
.b64-converter-tool textarea:focus {
    background: var(--b64-bg);
}

.b64-textarea-wrapper textarea::placeholder,
.b64-converter-tool textarea::placeholder {
    color: var(--b64-text-muted);
    opacity: 0.7;
}

/* Input/Output Status */
.b64-input-status,
.b64-output-status {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 1rem;
    background: rgba(var(--primary-rgb), 0.03);
    border-top: 1px solid var(--b64-border);
    font-size: 0.8rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.b64-status-left,
.b64-status-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--b64-text-muted);
}

.b64-status-indicator {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    background: rgba(var(--primary-rgb), 0.1);
}

.b64-status-indicator.valid {
    background: rgba(39, 174, 96, 0.1);
    color: var(--b64-success);
}

.b64-status-indicator.invalid {
    background: rgba(231, 76, 60, 0.1);
    color: var(--b64-danger);
}

.b64-separator {
    color: var(--b64-text-muted);
    opacity: 0.5;
}

.b64-operation-badge {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-weight: 500;
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--b64-primary);
}

.b64-operation-badge.encoded {
    background: rgba(39, 174, 96, 0.1);
    color: var(--b64-success);
}

.b64-operation-badge.decoded {
    background: rgba(52, 152, 219, 0.1);
    color: var(--b64-info);
}

.b64-operation-badge.error {
    background: rgba(231, 76, 60, 0.1);
    color: var(--b64-danger);
}

/* ===== Actions Center ===== */
.b64-actions-center {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 0;
    flex-wrap: wrap;
}

/* ===== Options Sidebar ===== */
.b64-options-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.b64-options-section {
    background: var(--b64-surface);
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
    padding: 1rem;
}

.b64-options-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--b64-text);
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--b64-border);
}

.b64-options-section h4 i {
    color: var(--b64-primary);
}

/* Option Groups */
.b64-option-group {
    margin-bottom: 0.75rem;
}

.b64-option-group:last-child {
    margin-bottom: 0;
}

.b64-checkbox-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--b64-text);
    cursor: pointer;
}

.b64-checkbox-option input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--b64-primary);
}

.b64-option-hint {
    margin: 0.25rem 0 0 1.5rem;
    font-size: 0.75rem;
    color: var(--b64-text-muted);
}

.b64-sub-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding-left: 1.5rem;
}

.b64-sub-option label {
    font-size: 0.8rem;
    color: var(--b64-text-muted);
}

.b64-sub-option select {
    padding: 0.35rem 0.5rem;
    border-radius: 4px;
    border: 1px solid var(--b64-border);
    background: var(--b64-bg);
    color: var(--b64-text);
    font-size: 0.8rem;
}

/* Validation Result */
.b64-validation-result {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(var(--primary-rgb), 0.03);
    border-radius: var(--b64-radius);
}

.b64-validation-icon {
    font-size: 1.25rem;
    color: var(--b64-text-muted);
}

.b64-validation-result.valid .b64-validation-icon {
    color: var(--b64-success);
}

.b64-validation-result.invalid .b64-validation-icon {
    color: var(--b64-danger);
}

.b64-validation-text {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.b64-validation-status {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--b64-text);
}

.b64-validation-details {
    font-size: 0.75rem;
    color: var(--b64-text-muted);
}

/* Examples Section */
.b64-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.b64-example-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    border: 1px solid var(--b64-border);
    border-radius: 4px;
    background: var(--b64-bg);
    color: var(--b64-text);
    cursor: pointer;
    transition: var(--b64-transition);
}

.b64-example-btn:hover {
    border-color: var(--b64-primary);
    color: var(--b64-primary);
    background: rgba(var(--primary-rgb), 0.05);
}

/* ===== File Panel ===== */
.b64-file-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 992px) {
    .b64-file-container {
        grid-template-columns: 1fr;
    }
}

.b64-file-section {
    background: var(--b64-surface);
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
    padding: 1.25rem;
}

.b64-file-section h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--b64-text);
}

.b64-file-section h3 i {
    color: var(--b64-primary);
}

/* Drop Zone */
.b64-drop-zone {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2.5rem 1.5rem;
    border: 2px dashed var(--b64-border);
    border-radius: var(--b64-radius);
    background: rgba(var(--primary-rgb), 0.02);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.b64-drop-zone:hover,
.b64-drop-zone.drag-over {
    border-color: var(--b64-primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.b64-drop-zone.drag-over {
    transform: scale(1.01);
}

.b64-drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.b64-drop-content i {
    font-size: 2.5rem;
    color: var(--b64-primary);
    opacity: 0.7;
}

.b64-drop-content h4 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--b64-text);
}

.b64-drop-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--b64-text-muted);
}

.b64-file-types {
    font-size: 0.75rem;
    color: var(--b64-text-muted);
    margin-top: 0.5rem;
}

.b64-drop-zone-small {
    padding: 1.5rem 1rem;
}

.b64-drop-zone-small .b64-drop-content i {
    font-size: 1.75rem;
}

.b64-drop-zone-small .b64-drop-content p {
    font-size: 0.8rem;
}

/* File Info */
.b64-file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    margin-top: 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
}

.b64-file-preview {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--b64-surface);
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
    overflow: hidden;
}

.b64-file-preview i {
    font-size: 1.5rem;
    color: var(--b64-primary);
}

.b64-file-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.b64-file-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.b64-file-name {
    font-weight: 600;
    color: var(--b64-text);
    word-break: break-all;
}

.b64-file-meta {
    font-size: 0.8rem;
    color: var(--b64-text-muted);
}

/* Progress Bar */
.b64-file-progress {
    margin-top: 1rem;
}

.b64-progress-bar {
    height: 6px;
    background: var(--b64-border);
    border-radius: 3px;
    overflow: hidden;
}

.b64-progress-fill {
    height: 100%;
    width: 0;
    background: var(--b64-gradient);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.b64-progress-text {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--b64-text-muted);
    text-align: center;
}

/* File Actions */
.b64-file-actions {
    margin-top: 1rem;
}

/* File Output */
.b64-file-output {
    margin-top: 1rem;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
    overflow: hidden;
}

.b64-output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-bottom: 1px solid var(--b64-border);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--b64-text);
}

.b64-output-header i {
    color: var(--b64-success);
    margin-right: 0.5rem;
}

.b64-output-actions {
    display: flex;
    gap: 0.35rem;
}

.b64-file-output textarea {
    min-height: 120px;
}

.b64-output-stats {
    display: flex;
    gap: 1.5rem;
    padding: 0.6rem 1rem;
    background: rgba(var(--primary-rgb), 0.03);
    border-top: 1px solid var(--b64-border);
    font-size: 0.8rem;
    color: var(--b64-text-muted);
    flex-wrap: wrap;
}

.b64-output-stats i {
    color: var(--b64-primary);
    margin-right: 0.35rem;
}

/* Decode Input/Options */
.b64-decode-input {
    margin-bottom: 1rem;
}

.b64-decode-input textarea {
    min-height: 150px;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
}

.b64-decode-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.b64-option-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.b64-option-row label {
    min-width: 80px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--b64-text);
}

.b64-option-row input[type="text"],
.b64-option-row select {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
    background: var(--b64-surface);
    color: var(--b64-text);
    font-size: 0.9rem;
}

.dark-theme .b64-option-row input[type="text"],
.dark-theme .b64-option-row select {
    background: #1a1d24;
    border-color: rgba(255, 255, 255, 0.08);
}

.b64-option-row input:focus,
.b64-option-row select:focus {
    outline: none;
    border-color: var(--b64-primary);
}

/* Decode Validation */
.b64-decode-validation {
    padding: 0.5rem 0.75rem;
    border-radius: var(--b64-radius);
    font-size: 0.85rem;
    margin-bottom: 1rem;
    display: none;
}

.b64-decode-validation.valid {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(39, 174, 96, 0.1);
    border: 1px solid rgba(39, 174, 96, 0.2);
    color: var(--b64-success);
}

.b64-decode-validation.invalid {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.2);
    color: var(--b64-danger);
}

/* Decode Preview */
.b64-decode-preview {
    margin-bottom: 1rem;
}

.b64-decode-preview h4 {
    margin: 0 0 0.75rem 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--b64-text);
}

.b64-preview-content {
    max-width: 100%;
    max-height: 200px;
    overflow: hidden;
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
}

.b64-preview-content img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* ===== Batch Panel ===== */
.b64-batch-container {
    max-width: 900px;
    margin: 0 auto;
}

.b64-batch-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.b64-batch-header h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 0 0 0.5rem 0;
    font-size: 1.25rem;
    color: var(--b64-text);
}

.b64-batch-header h3 i {
    color: var(--b64-primary);
}

.b64-batch-header p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--b64-text-muted);
}

/* Batch Tabs */
.b64-batch-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.35rem;
    background: rgba(var(--primary-rgb), 0.03);
    border-radius: var(--b64-radius);
}

.b64-batch-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    color: var(--b64-text-muted);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--b64-transition);
}

.b64-batch-tab:hover {
    background: var(--b64-surface);
    color: var(--b64-text);
}

.b64-batch-tab.active {
    background: var(--b64-primary);
    color: white;
}

/* Batch Modes */
.b64-batch-mode {
    display: none;
}

.b64-batch-mode.active {
    display: block;
}

/* Batch List */
.b64-batch-list {
    margin-top: 1rem;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
    overflow: hidden;
}

.b64-batch-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-bottom: 1px solid var(--b64-border);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--b64-text);
}

.b64-batch-items {
    max-height: 300px;
    overflow-y: auto;
}

.b64-batch-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--b64-border);
    transition: background 0.2s;
}

.b64-batch-item:last-child {
    border-bottom: none;
}

.b64-batch-item:hover {
    background: rgba(var(--primary-rgb), 0.03);
}

.b64-batch-item-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--primary-rgb), 0.1);
    border-radius: 6px;
    color: var(--b64-primary);
}

.b64-batch-item-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.b64-batch-item-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--b64-text);
}

.b64-batch-item-size {
    font-size: 0.75rem;
    color: var(--b64-text-muted);
}

.b64-batch-item-status {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
}

.b64-batch-item-status.pending {
    color: var(--b64-text-muted);
}

.b64-batch-item-status.processing {
    color: var(--b64-warning);
}

.b64-batch-item-status.done {
    color: var(--b64-success);
}

.b64-batch-item-status.error {
    color: var(--b64-danger);
}

.b64-batch-item-remove {
    background: none;
    border: none;
    color: var(--b64-text-muted);
    cursor: pointer;
    padding: 0.25rem;
    transition: color 0.2s;
}

.b64-batch-item-remove:hover {
    color: var(--b64-danger);
}

/* Batch Actions */
.b64-batch-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

/* Batch Text Mode */
.b64-batch-text-input {
    margin-bottom: 1rem;
}

.b64-batch-text-input label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--b64-text);
}

.b64-batch-text-input textarea {
    min-height: 150px;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
}

.b64-batch-options {
    margin-bottom: 1rem;
}

.b64-batch-text-output {
    margin-top: 1.5rem;
}

.b64-batch-text-output label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--b64-text);
}

.b64-batch-text-output textarea {
    min-height: 150px;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
}

.b64-batch-output-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

/* ===== Data URI Panel ===== */
.b64-datauri-container {
    max-width: 1000px;
    margin: 0 auto;
}

.b64-datauri-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.b64-datauri-header h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 0 0 0.5rem 0;
    font-size: 1.25rem;
    color: var(--b64-text);
}

.b64-datauri-header h3 i {
    color: var(--b64-primary);
}

.b64-datauri-header p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--b64-text-muted);
}

.b64-datauri-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .b64-datauri-content {
        grid-template-columns: 1fr;
    }
}

.b64-datauri-section {
    background: var(--b64-surface);
    border-radius: var(--b64-radius);
    border: 1px solid var(--b64-border);
    padding: 1.25rem;
}

.b64-datauri-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--b64-text);
}

.b64-datauri-section h4 i {
    color: var(--b64-primary);
}

.b64-datauri-file-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1rem;
    margin: 1rem 0;
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: var(--b64-radius);
    font-size: 0.85rem;
}

.b64-datauri-options {
    margin: 1rem 0;
}

.b64-datauri-output {
    margin-top: 1rem;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
    overflow: hidden;
}

.b64-datauri-output textarea {
    min-height: 80px;
    font-size: 0.75rem;
}

/* Code Snippets */
.b64-code-snippets {
    padding: 1rem;
    border-top: 1px solid var(--b64-border);
}

.b64-code-snippets h5 {
    margin: 0 0 0.75rem 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--b64-text);
}

.b64-snippet {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    padding: 0.6rem;
    background: rgba(var(--primary-rgb), 0.03);
    border-radius: var(--b64-radius);
}

.b64-snippet:last-child {
    margin-bottom: 0;
}

.b64-snippet label {
    min-width: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--b64-text-muted);
}

.b64-snippet code {
    flex: 1;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.75rem;
    color: var(--b64-text);
    word-break: break-all;
    display: block;
    max-height: 60px;
    overflow-y: auto;
}

.b64-copy-snippet {
    flex-shrink: 0;
}

/* Parse Section */
.b64-datauri-section textarea {
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
    min-height: 120px;
    margin-bottom: 1rem;
}

.b64-parse-result {
    margin-top: 1rem;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
    overflow: hidden;
}

.b64-parse-info {
    padding: 1rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    border-bottom: 1px solid var(--b64-border);
}

.b64-parse-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.b64-parse-item label {
    font-size: 0.75rem;
    color: var(--b64-text-muted);
}

.b64-parse-item span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--b64-text);
}

.b64-parse-preview {
    padding: 1rem;
    text-align: center;
    border-bottom: 1px solid var(--b64-border);
}

.b64-parse-preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--b64-radius);
}

.b64-parse-result .b64-btn {
    margin: 1rem;
    width: calc(100% - 2rem);
}

/* ===== Toast Notification ===== */
.b64-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--b64-surface);
    color: var(--b64-text);
    border-radius: var(--b64-radius);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--b64-border);
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.b64-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

.b64-toast i {
    font-size: 1.25rem;
    color: var(--b64-success);
}

.b64-toast.error i {
    color: var(--b64-danger);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .b64-converter-tool {
        padding: 1rem;
    }

    .b64-header {
        padding: 1rem;
    }

    .b64-header-content {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }

    .b64-header-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
    }

    .b64-header-text h2 {
        font-size: 1.25rem;
    }

    .b64-main-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 0.75rem;
    }

    .b64-main-tab {
        flex: none;
        padding: 0.5rem 1rem;
    }

    .b64-main-tab span {
        display: none;
    }

    .b64-panel {
        padding: 1rem;
    }

    .b64-actions-center {
        flex-direction: column;
    }

    .b64-btn {
        width: 100%;
        justify-content: center;
    }

    .b64-learn-steps {
        grid-template-columns: 1fr;
    }

    .b64-step {
        flex-direction: column;
        text-align: center;
    }

    .b64-step-number {
        margin: 0 auto;
    }

    .b64-batch-tabs {
        flex-direction: column;
    }

    .b64-batch-item {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .b64-section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .b64-section-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .b64-input-status,
    .b64-output-status {
        flex-direction: column;
        align-items: flex-start;
    }

    .b64-status-right {
        width: 100%;
        justify-content: space-between;
    }
}

/* ===== Animations ===== */
@keyframes b64Pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.b64-btn-primary:active:not(:disabled) {
    animation: b64Pulse 0.2s ease;
}

/* ===== Scrollbar Styling ===== */
.b64-converter-tool ::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.b64-converter-tool ::-webkit-scrollbar-track {
    background: transparent;
}

.b64-converter-tool ::-webkit-scrollbar-thumb {
    background: var(--b64-border);
    border-radius: 3px;
}

.b64-converter-tool ::-webkit-scrollbar-thumb:hover {
    background: var(--b64-primary);
}

/* ===== Print Styles ===== */
@media print {
    .b64-converter-tool {
        padding: 0;
    }

    .b64-header-actions,
    .b64-section-actions,
    .b64-actions-center,
    .b64-batch-actions,
    .b64-file-actions,
    .b64-toast {
        display: none !important;
    }
}