/* ============================================================
   BASE64 TOOLS — Tool-specific styles
   Prefix: bt-
   ============================================================ */

/* ---- Container ---- */
.bt-tool {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

/* ============================================================
   MODE TABS
   ============================================================ */
.bt-mode-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 0;
    margin-bottom: 0;
}

.bt-mode-tab {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast);
    white-space: nowrap;
}

.bt-mode-tab:hover {
    color: var(--color-text);
}

.bt-mode-tab.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
    font-weight: 600;
}

.bt-mode-tab i {
    font-size: 0.875rem;
}

/* ============================================================
   MODE PANELS
   ============================================================ */
.bt-mode-panel {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

/* ============================================================
   OPTIONS BAR
   ============================================================ */
.bt-options-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.bt-option-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.bt-option-group--right {
    margin-left: auto;
}

.bt-option-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.bt-option-sep {
    width: 1px;
    height: 20px;
    background: var(--color-border);
    flex-shrink: 0;
}

.bt-select {
    padding: 0.3rem var(--space-3);
    font-size: var(--text-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.bt-select:focus {
    outline: none;
    border-color: var(--color-accent);
}

.bt-select-sm {
    padding: 0.2rem var(--space-2);
    font-size: var(--text-xs);
}

.bt-checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    user-select: none;
}

.bt-checkbox {
    width: 15px;
    height: 15px;
    cursor: pointer;
    accent-color: var(--color-accent);
}

/* ============================================================
   ERROR MESSAGE
   ============================================================ */
.bt-error {
    padding: var(--space-3) var(--space-4);
    background: var(--color-error-light);
    color: #991B1B;
    border: 1px solid #FECACA;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

[data-theme="dark"] .bt-error {
    background: rgba(239, 68, 68, 0.15);
    color: #FCA5A5;
    border-color: rgba(239, 68, 68, 0.3);
}

/* ============================================================
   TEXTAREA BLOCKS
   ============================================================ */
.bt-textarea-wrap {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.bt-textarea-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
}

.bt-textarea-label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.bt-stats-text {
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
    font-family: var(--font-mono);
}

.bt-textarea {
    width: 100%;
    min-height: 180px;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    resize: vertical;
    transition: border-color var(--transition-fast);
    box-sizing: border-box;
}

.bt-textarea:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-accent-light);
}

.bt-textarea-input {
    background: var(--color-surface);
}

.bt-textarea-output {
    background: var(--color-bg-secondary);
    cursor: default;
}

.bt-textarea-batch {
    min-height: 260px;
}

/* ============================================================
   SIZE COMPARISON BAR
   ============================================================ */
.bt-size-bar {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-2) var(--space-1);
}

.bt-size-text {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    white-space: nowrap;
    flex-shrink: 0;
}

.bt-size-track {
    flex: 1;
    height: 5px;
    background: var(--color-border);
    border-radius: 99px;
    overflow: hidden;
    min-width: 80px;
}

.bt-size-fill {
    height: 100%;
    border-radius: 99px;
    transition: width 0.35s ease, background-color 0.35s ease;
}

.bt-size-fill--green  { background: var(--color-success); }
.bt-size-fill--yellow { background: var(--color-warning); }
.bt-size-fill--red    { background: var(--color-error); }

/* ============================================================
   BUTTONS
   ============================================================ */
.bt-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.45rem var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--transition-fast), color var(--transition-fast),
                border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.bt-btn:hover {
    background: var(--color-surface-alt);
    color: var(--color-text);
    border-color: var(--color-accent);
}

.bt-btn-primary {
    background: var(--gradient-accent);
    color: #fff;
    border-color: transparent;
    font-weight: 600;
}

.bt-btn-primary:hover {
    background: var(--gradient-accent-hover);
    color: #fff;
    border-color: transparent;
}

.bt-btn-sm {
    padding: 0.3rem var(--space-3);
    font-size: var(--text-xs);
}

.bt-btn-xs {
    padding: 0.2rem var(--space-2);
    font-size: var(--text-xs);
}

.bt-btn-qr {
    margin-left: auto;
}

/* ============================================================
   ACTION BAR
   ============================================================ */
.bt-action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    align-items: center;
}

/* ============================================================
   DIRECTION BAR (Image encode vs decode toggle)
   ============================================================ */
.bt-mode-direction-bar {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.bt-direction-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.bt-direction-btn.active {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.bt-direction-btn:hover:not(.active) {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ============================================================
   DROP ZONE
   ============================================================ */
.bt-drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-12) var(--space-8);
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-fast), background var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
}

.bt-drop-zone:hover,
.bt-drop-zone:focus,
.bt-drop-zone.drag-over {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
    outline: none;
}

.bt-drop-icon {
    font-size: 2.5rem;
    color: var(--color-text-subtle);
    transition: color var(--transition-fast);
}

.bt-drop-zone:hover .bt-drop-icon,
.bt-drop-zone.drag-over .bt-drop-icon {
    color: var(--color-accent);
}

.bt-drop-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.bt-drop-hint {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ============================================================
   IMAGE PREVIEW
   ============================================================ */
.bt-image-preview-wrap {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.bt-image-preview-thumb {
    max-width: 120px;
    max-height: 120px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    object-fit: contain;
    background: #fff;
}

.bt-image-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.bt-image-info {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.bt-image-size {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.bt-copy-formats {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) 0 0;
}

.bt-copy-formats-label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    margin-right: var(--space-1);
}

.bt-image-decode-result {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.bt-image-decode-preview {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    object-fit: contain;
}

/* ============================================================
   FILE MODE
   ============================================================ */
.bt-file-info-bar {
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    word-break: break-all;
}

/* ============================================================
   BATCH MODE
   ============================================================ */
.bt-batch-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

/* ============================================================
   ENCODING COMPARISON
   ============================================================ */
.bt-comparison {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.bt-comparison-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border: none;
    cursor: pointer;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-align: left;
    transition: background var(--transition-fast);
}

.bt-comparison-toggle:hover {
    background: var(--color-surface-alt);
    color: var(--color-text);
}

.bt-comparison-chevron {
    font-size: 0.75rem;
    transition: transform var(--transition-fast);
}

.bt-comparison-chevron.open {
    transform: rotate(90deg);
}

.bt-comparison-body {
    padding: var(--space-4);
    border-top: 1px solid var(--color-border);
}

.bt-comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}

.bt-comparison-table th {
    text-align: left;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
}

.bt-comparison-table td {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: middle;
    color: var(--color-text-secondary);
}

.bt-comparison-table tr:last-child td {
    border-bottom: none;
}

.bt-comparison-table tr:hover td {
    background: var(--color-surface-alt);
}

.bt-comparison-value {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text);
    max-width: 320px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ============================================================
   JWT DECODER
   ============================================================ */
.bt-jwt-section {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.bt-jwt-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
}

.bt-jwt-section-title {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.bt-jwt-header-color  { color: #3B82F6; }
.bt-jwt-payload-color { color: #10B981; }
.bt-jwt-sig-color     { color: #F59E0B; }

.bt-jwt-code {
    background: #0F172A;
    color: #E2E8F0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    padding: var(--space-4);
    margin: 0;
    overflow: auto;
    max-height: 220px;
    white-space: pre;
}

.bt-jwt-claims {
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.bt-jwt-status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
}

.bt-jwt-status--valid {
    background: var(--color-success-light);
    color: #065F46;
}

.bt-jwt-status--expired {
    background: var(--color-error-light);
    color: #991B1B;
}

[data-theme="dark"] .bt-jwt-status--valid  { background: rgba(16,185,129,0.15); color: #6EE7B7; }
[data-theme="dark"] .bt-jwt-status--expired { background: rgba(239,68,68,0.15); color: #FCA5A5; }

.bt-jwt-claims-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-3);
}

.bt-jwt-claim-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.bt-jwt-claim-key {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.bt-jwt-claim-val {
    font-size: var(--text-sm);
    color: var(--color-text);
    font-family: var(--font-mono);
    word-break: break-all;
}

.bt-jwt-sig-info {
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.bt-jwt-sig-row {
    display: flex;
    gap: var(--space-3);
    align-items: flex-start;
    flex-wrap: wrap;
}

.bt-jwt-sig-key {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

.bt-jwt-sig-value {
    font-size: var(--text-sm);
    font-family: var(--font-mono);
    color: var(--color-text);
}

.bt-jwt-sig-b64 {
    word-break: break-all;
}

.bt-jwt-sig-notice {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--color-warning-light);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: #92400E;
    line-height: var(--leading-relaxed);
}

[data-theme="dark"] .bt-jwt-sig-notice {
    background: rgba(245,158,11,0.12);
    color: #FDE68A;
}

.bt-jwt-sig-notice i {
    color: var(--color-warning);
    flex-shrink: 0;
    margin-top: 2px;
}

/* ============================================================
   QR CODE MODAL
   ============================================================ */
.bt-qr-modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

.bt-qr-modal-inner {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    min-width: 280px;
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.bt-qr-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text);
}

.bt-qr-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-muted);
    cursor: pointer;
    line-height: 1;
    padding: 0 4px;
    transition: color var(--transition-fast);
}

.bt-qr-close:hover { color: var(--color-text); }

.bt-qr-container {
    display: flex;
    justify-content: center;
}

.bt-qr-container img,
.bt-qr-container canvas {
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.bt-qr-actions {
    display: flex;
    justify-content: center;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .bt-batch-grid {
        grid-template-columns: 1fr;
    }

    .bt-options-bar {
        gap: var(--space-2);
    }

    .bt-option-sep {
        display: none;
    }

    .bt-option-group--right {
        margin-left: 0;
        width: 100%;
    }

    .bt-mode-tabs {
        gap: var(--space-1);
    }

    .bt-mode-tab {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }

    .bt-drop-zone {
        padding: var(--space-8) var(--space-4);
    }

    .bt-image-preview-wrap {
        flex-direction: column;
    }

    .bt-size-bar {
        flex-direction: column;
        align-items: flex-start;
    }

    .bt-size-track {
        width: 100%;
    }

    .bt-jwt-claims-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .bt-jwt-claims-grid {
        grid-template-columns: 1fr;
    }
    .bt-copy-formats {
        gap: var(--space-1);
    }
}