:root {
    /* Solar Flare Palette */
    --bg-base: #1C1207;
    --bg-surface: #2A1A0A;
    --bg-panel: #3D260F;
    
    --primary: #F59E0B;
    --primary-hover: #D97706;
    --secondary: #FCD34D;
    --accent: #EF4444;
    
    --text-main: #FFF7ED;
    --text-muted: #FED7AA;
    
    --border: #5C3A21;
    --border-light: rgba(245, 158, 11, 0.2);
    
    --success: #10B981;
    --info: #3B82F6;
    
    --radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
    line-height: 1.5;
}

/* Layout */
.app-layout {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.sidebar {
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.tools-panel {
    width: 280px;
    border-right: 1px solid var(--border);
}

.properties-panel {
    width: 320px;
    border-left: 1px solid var(--border);
    border-right: none;
}

/* Scrollbar */
.custom-scrollbar {
    overflow-y: auto;
}
.custom-scrollbar::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
.custom-scrollbar::-webkit-scrollbar-track {
    background: transparent;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
    background-color: var(--border);
    border-radius: 10px;
}
.custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary);
}

/* Typography & Core UI */
.brand {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.brand i {
    color: var(--primary);
    width: 28px; height: 28px;
}
.brand h1 {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--primary);
}

.panel-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}
.panel-section h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.panel-section h3 i {
    width: 16px; height: 16px;
}

/* Node Palette */
.node-palette {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

.palette-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background-color: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: grab;
    transition: all 0.2s;
    user-select: none;
}
.palette-item:hover {
    background-color: var(--bg-base);
    border-color: var(--primary);
}
.palette-item:active {
    cursor: grabbing;
}
.node-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.node-icon i {
    width: 16px; height: 16px;
}

/* Buttons */
.btn-primary, .btn-outline, .btn-action, .btn-danger {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    border: none;
}

.btn-primary {
    background-color: var(--primary);
    color: #000;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
}
.btn-outline:hover {
    background-color: var(--bg-panel);
    border-color: var(--primary-light);
}

.btn-action {
    background-color: var(--bg-panel);
    color: var(--text-main);
}
.btn-action:hover {
    background-color: var(--border);
}

.btn-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--accent);
    border: 1px solid rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
    background-color: var(--accent);
    color: #fff;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.icon-btn:hover {
    background-color: var(--bg-panel);
    color: var(--text-main);
}

.template-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.actions-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.mt-4 { margin-top: 1rem; }

/* Canvas Area */
.canvas-container {
    flex: 1;
    position: relative;
    background-color: var(--bg-base);
    background-image: 
        radial-gradient(circle at 1px 1px, var(--border) 1px, transparent 0);
    background-size: 30px 30px;
    overflow: hidden;
}

.canvas-toolbar {
    position: absolute;
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 12px;
    display: flex;
    gap: 1rem;
    z-index: 50;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.toolbar-group {
    display: flex;
    gap: 0.25rem;
}
.mode-switch {
    border-left: 1px solid var(--border);
    padding-left: 1rem;
}

.mode-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}
.mode-btn.active {
    background-color: var(--primary-light);
    color: var(--primary);
}

.canvas-area {
    position: absolute;
    top: 0; left: 0;
    width: 5000px;
    height: 5000px;
    transform-origin: 0 0;
}

#connections-layer {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none; /* Let clicks pass through to nodes unless stroke is clicked */
}

.connection-path {
    fill: none;
    stroke: var(--text-muted);
    stroke-width: 2;
    pointer-events: auto; /* Clickable */
    cursor: pointer;
    transition: stroke 0.2s, stroke-width 0.2s;
}
.connection-path:hover {
    stroke: var(--primary);
    stroke-width: 4;
}
.connection-path.selected {
    stroke: var(--primary);
    stroke-width: 3;
    stroke-dasharray: 5,5;
    animation: dash 1s linear infinite;
}

@keyframes dash {
  to {
    stroke-dashoffset: -10;
  }
}

.connection-arrow {
    fill: var(--text-muted);
    transition: fill 0.2s;
}
.connection-path:hover ~ .connection-arrow,
.connection-path.selected ~ .connection-arrow {
    fill: var(--primary);
}

.connection-label {
    fill: var(--text-main);
    font-size: 12px;
    font-family: 'Fira Code', monospace;
    text-anchor: middle;
    pointer-events: none;
    background: var(--bg-base);
}

#nodes-layer {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
}

/* Draggable Service Node */
.service-node {
    position: absolute;
    width: 200px;
    background: rgba(42, 26, 10, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    cursor: grab;
    user-select: none;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.service-node:active {
    cursor: grabbing;
}
.service-node:hover {
    border-color: var(--text-muted);
}
.service-node.selected {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light), 0 10px 25px rgba(0,0,0,0.5);
    z-index: 100;
}

.node-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}
.node-title-area {
    flex: 1;
    overflow: hidden;
}
.node-title {
    font-weight: 700;
    font-size: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-main);
}
.node-tech {
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.node-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Ports for connecting */
.node-port {
    position: absolute;
    width: 12px; height: 12px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.2s, background 0.2s, transform 0.2s;
    z-index: 10;
}
.service-node:hover .node-port,
.service-node.selected .node-port {
    opacity: 1;
}
.node-port:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: scale(1.5);
    cursor: crosshair;
}
/* Port positions */
.port-top { top: -6px; left: 50%; transform: translateX(-50%); }
.port-right { top: 50%; right: -6px; transform: translateY(-50%); }
.port-bottom { bottom: -6px; left: 50%; transform: translateX(-50%); }
.port-left { top: 50%; left: -6px; transform: translateY(-50%); }

.port-top:hover { transform: translateX(-50%) scale(1.5); }
.port-right:hover { transform: translateY(-50%) scale(1.5); }
.port-bottom:hover { transform: translateX(-50%) scale(1.5); }
.port-left:hover { transform: translateY(-50%) scale(1.5); }

/* Properties Panel */
.panel-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}
.panel-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}

.empty-state {
    padding: 3rem 1.5rem;
    text-align: center;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}
.empty-state i {
    width: 32px; height: 32px;
    opacity: 0.5;
}

.editor-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}
.form-group label span {
    font-weight: 400;
    opacity: 0.7;
    font-size: 0.75rem;
}

.input-field {
    width: 100%;
    background-color: var(--bg-panel);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}
.input-field:focus {
    border-color: var(--primary);
}
textarea.input-field {
    resize: vertical;
    min-height: 80px;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    width: 90%;
    max-width: 700px;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    max-height: 90vh;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}
.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-body {
    padding: 1.5rem;
    flex: 1;
    overflow:hidden;
    display:flex;
}
.code-editor {
    width: 100%;
    height: 400px;
    background: #000;
    color: var(--secondary);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    resize: none;
    outline: none;
}
.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--primary);
    color: #000;
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 2000;
}

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