:root {
    --art-canvas-bg: #f8fafc;
    --art-card-bg: #ffffff;
    --art-border-color: #e2e8f0;
    --art-font-main: #0f172a;
    --art-font-muted: #64748b;
    --art-accent-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    --art-accent: #2563eb;
    --art-success: #16a34a;
    --art-danger-alpha: #fef2f2;
    --art-danger-text: #b91c1c;
}

.art-wrapper.art-dark-theme {
    --art-canvas-bg: #0f172a;
    --art-card-bg: #1e293b;
    --art-border-color: #334155;
    --art-font-main: #f8fafc;
    --art-font-muted: #94a3b8;
    --art-accent: #3b82f6;
}

#art-container {
    background-color: var(--art-canvas-bg);
    color: var(--art-font-main);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--art-border-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    max-width: 1250px;
    margin: 20px auto;
    box-sizing: border-box;
    transition: background-color 0.3s ease;
}

#art-container *, #art-container *::before, #art-container *::after { box-sizing: border-box; }

.art-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--art-border-color);
    padding-bottom: 14px;
    margin-bottom: 20px;
}

.art-header h2 {
    margin: 0;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--art-accent);
}

.art-card {
    background: var(--art-card-bg);
    border: 1px solid var(--art-border-color);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.03);
    margin-bottom: 20px;
}

.art-control-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.art-control-grid label {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--art-font-muted);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.art-control-grid select, .art-control-grid input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--art-border-color);
    background: var(--art-canvas-bg);
    color: var(--art-font-main);
    border-radius: 6px;
    font-size: 0.9rem;
    outline: none;
}

.art-split-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 20px;
}

@media (max-width: 850px) {
    .art-split-grid { grid-template-columns: 1fr; }
}

.art-pane {
    background: var(--art-card-bg);
    border: 1px solid var(--art-border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.art-pane-header {
    background: rgba(0,0,0,0.01);
    padding: 12px 16px;
    border-bottom: 1px solid var(--art-border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.art-pane-actions { display: flex; gap: 8px; }
.art-pane-actions button, .art-file-label {
    background: var(--art-canvas-bg);
    border: 1px solid var(--art-border-color);
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--art-font-main);
}

.art-file-label input { display: none; }

#art-input-editor {
    width: 100%;
    height: 380px;
    border: none;
    resize: none;
    padding: 16px;
    font-size: 1rem;
    line-height: 1.6;
    background: transparent;
    color: var(--art-font-main);
    outline: none;
}

.art-output-container {
    position: relative;
    height: 380px;
    overflow-y: auto;
    padding: 16px;
}

.art-output-text-layer {
    font-size: 1rem;
    line-height: 1.6;
    outline: none;
    white-space: pre-wrap;
}

.art-placeholder-msg {
    color: var(--art-font-muted);
    font-style: italic;
    display: flex;
    align-items: center;
    height: 100%;
    justify-content: center;
    text-align: center;
}

.art-pane-footer {
    background: rgba(0,0,0,0.01);
    padding: 10px 16px;
    border-top: 1px solid var(--art-border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--art-font-muted);
}

.art-btn-danger {
    background: transparent;
    border: none;
    color: var(--art-danger-text);
    cursor: pointer;
    font-weight: 600;
}

.art-action-row {
    display: flex;
    justify-content: center;
    margin-bottom: 24px;
}

.art-btn-gradient {
    background: var(--art-accent-gradient);
    color: #fff;
    border: none;
    padding: 14px 32px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(37,99,235,0.2);
    transition: transform 0.2s ease;
}

.art-btn-gradient:hover { transform: translateY(-1px); }

.art-util-btn {
    background: var(--art-card-bg);
    border: 1px solid var(--art-border-color);
    color: var(--art-font-main);
    padding: 8px 14px;
    border-radius: 4px;
    cursor: pointer;
}

/* Loader System Overlays */
.art-loader-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(255,255,255,0.85);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--art-accent);
}
.art-dark-theme .art-loader-overlay { background: rgba(30,41,59,0.9); }
.art-loader-overlay i { font-size: 2.2rem; margin-bottom: 12px; }

/* Dashboard Analytics Widgets Grid Mapping Layout */
.art-metric-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-top: 12px;
}

.art-metric-card {
    background: var(--art-canvas-bg);
    border: 1px solid var(--art-border-color);
    padding: 14px;
    border-radius: 6px;
    text-align: center;
}

.art-metric-card .lbl { display: block; font-size: 0.75rem; font-weight: 700; color: var(--art-font-muted); text-transform: uppercase; margin-bottom: 4px; }
.art-metric-card .val { font-size: 1.4rem; font-weight: 800; }

.art-suggestions-box { margin-top: 16px; background: rgba(0,0,0,0.01); padding: 14px; border-radius: 6px; }
.art-suggestions-box h4 { margin: 0 0 8px 0; font-size: 0.95rem; }
.art-suggestions-box ul { padding-left: 20px; margin: 0; font-size: 0.9rem; line-height: 1.5; }

.art-alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 20px; font-weight: 600; font-size: 0.9rem; }
.art-alert-warning { background-color: #fffbeb; color: #b45309; border: 1px solid #fde68a; }

.text-success { color: var(--art-success) !important; }
.text-accent { color: var(--art-accent) !important; }