:root {
    --irt-primary-gradient: linear-gradient(135deg, #0073aa 0%, #00a0d2 100%);
    --irt-success-gradient: linear-gradient(135deg, #46b450 0%, #2dc26b 100%);
    --irt-danger-gradient: linear-gradient(135deg, #dc3232 0%, #ff4d4d 100%);
    --irt-bg: #f0f3f5;
    --irt-card-bg: #ffffff;
    --irt-text: #2c3338;
    --irt-text-muted: #646970;
    --irt-border: #ccd0d4;
    --irt-radius: 10px;
    --irt-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.irt-dark-mode {
    --irt-bg: #1a1d20;
    --irt-card-bg: #2d3238;
    --irt-text: #f0f6fc;
    --irt-text-muted: #8b949e;
    --irt-border: #444c56;
    --irt-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.irt-container {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    background-color: var(--irt-bg);
    color: var(--irt-text);
    padding: 25px;
    border-radius: var(--irt-radius);
    box-shadow: var(--irt-shadow);
    max-width: 1200px;
    margin: 20px auto;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.irt-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--irt-border);
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.irt-header h2 {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
}

.irt-header h2 i {
    margin-right: 10px;
    color: #0073aa;
}

/* Dropzone Styles */
.irt-dropzone {
    border: 3px dashed var(--irt-border);
    background-color: var(--irt-card-bg);
    border-radius: var(--irt-radius);
    padding: 50px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    margin-bottom: 25px;
}

.irt-dropzone:hover, .irt-dropzone.dragover {
    border-color: #0073aa;
    background-color: rgba(0, 115, 170, 0.04);
    transform: translateY(-2px);
}

.irt-upload-icon {
    font-size: 54px;
    color: #0073aa;
    margin-bottom: 15px;
    animation: bounce 2s infinite;
}

.irt-formats-label {
    font-size: 12px;
    color: var(--irt-text-muted);
    margin-top: 10px;
}

/* Main Functional Grid layout Workspace */
.irt-workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
    align-items: start;
}

@media (max-width: 900px) {
    .irt-workspace {
        grid-template-columns: 1fr;
    }
}

.irt-card {
    background-color: var(--irt-card-bg);
    border: 1px solid var(--irt-border);
    border-radius: var(--irt-radius);
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: var(--irt-shadow);
}

.irt-card h3 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 16px;
    border-bottom: 1px solid var(--irt-border);
    padding-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Tab Layout Selectors */
.irt-tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--irt-border);
    padding-bottom: 5px;
}

.irt-tab-btn {
    background: none;
    border: none;
    padding: 8px 12px;
    cursor: pointer;
    color: var(--irt-text-muted);
    font-weight: 600;
    font-size: 13px;
    border-radius: 4px;
}

.irt-tab-btn.active {
    background-color: #0073aa;
    color: #ffffff;
}

.irt-tab-content {
    display: none;
}

.irt-tab-content.active {
    display: block;
}

/* Control Fields elements */
.irt-input-group-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 15px;
}

.irt-input-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 15px;
}

.irt-input-field label {
    font-size: 13px;
    font-weight: 600;
}

.irt-input-field input, .irt-input-field select {
    padding: 10px;
    border: 1px solid var(--irt-border);
    border-radius: 6px;
    background-color: var(--irt-bg);
    color: var(--irt-text);
    font-size: 14px;
}

.irt-checkbox-field {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    font-size: 13px;
}

/* Queue Styles */
.irt-queue-list {
    max-height: 150px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.irt-queue-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background-color: var(--irt-bg);
    border-radius: 6px;
    font-size: 12px;
}

.irt-queue-item.active {
    border-left: 4px solid #0073aa;
}

/* Button UI Components */
.irt-actions-bar {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

.irt-btn-primary, .irt-btn-success, .irt-btn-danger, .irt-btn-secondary {
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    font-size: 14px;
    transition: opacity 0.2s;
}

.irt-btn-primary { background: var(--irt-primary-gradient); color: #fff; width: 100%; }
.irt-btn-success { background: var(--irt-success-gradient); color: #fff; width: 100%; }
.irt-btn-danger { background: var(--irt-danger-gradient); color: #fff; }
.irt-btn-secondary { background: var(--irt-border); color: var(--irt-text); }

.irt-btn-primary:hover, .irt-btn-success:hover, .irt-btn-danger:hover, .irt-btn-secondary:hover {
    opacity: 0.9;
}

/* Statistics Layout Cards */
.irt-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.irt-stat-card {
    background-color: var(--irt-card-bg);
    border: 1px solid var(--irt-border);
    padding: 15px;
    border-radius: var(--irt-radius);
    box-shadow: var(--irt-shadow);
}

.irt-stat-card h4 { margin: 0 0 10px 0; font-size: 14px; color: var(--irt-text-muted); }
.irt-stat-card p { margin: 5px 0; font-size: 13px; }
.irt-stat-card.highlight { border-color: #2dc26b; background-color: rgba(45, 194, 107, 0.02); }

/* Interactive Comparison & Preview Containers */
.irt-preview-header-tabs {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.irt-zoom-controls {
    display: flex;
    gap: 5px;
}

.irt-zoom-controls button {
    background-color: var(--irt-bg);
    border: 1px solid var(--irt-border);
    color: var(--irt-text);
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
}

.irt-comparison-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

@media (max-width: 600px) {
    .irt-comparison-wrapper { grid-template-columns: 1fr; }
    .irt-stats-grid { grid-template-columns: 1fr; }
}

.irt-comparison-pane h5 {
    margin: 0 0 8px 0;
    text-align: center;
    font-size: 12px;
    color: var(--irt-text-muted);
}

.irt-img-frame {
    border: 1px dashed var(--irt-border);
    background-color: var(--irt-bg);
    border-radius: 6px;
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.irt-img-frame img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform 0.2s ease-in-out;
}

/* Alert Notification block banner */
.irt-alert {
    padding: 12px 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 13px;
    font-weight: 500;
}
.irt-alert-danger { background-color: #fbeaea; color: #dc3232; border: 1px solid #f5c6cb; }

.irt-download-ready-msg {
    color: #46b450;
    font-weight: 600;
    margin-bottom: 15px;
    text-align: center;
}

/* Loading Overlay Screen spinner */
.irt-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999999;
    opacity: 0; pointer-events: none;
    transition: opacity 0.3s ease;
}

.irt-overlay.visible { opacity: 1; pointer-events: auto; }

.irt-spinner-box {
    background-color: var(--irt-card-bg);
    padding: 30px;
    border-radius: var(--irt-radius);
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.irt-loading-spinner {
    border: 4px solid var(--irt-border);
    border-top: 4px solid #0073aa;
    border-radius: 50%;
    width: 40px; height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px auto;
}

.irt-hint { font-size: 11px; color: var(--irt-text-muted); margin: 4px 0 0 0; }

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@keyframes bounce { 0%, 20%, 50%, 80%, 100% { transform: translateY(0); } 40% { transform: translateY(-8px); } 60% { transform: translateY(-4px); } }