:root {
    --bg-main: #0f1115; /* n8n dark canvas color */
    --bg-sidebar: #171923;
    --border: #2d3748;
    --border-hover: #4a5568;
    --text-primary: #f7fafc;
    --text-secondary: #a0aec0;
    
    --node-bg: #1a202c;
    --color-router: #9f7aea;
    --color-verify: #ed8936;
    --color-local: #48bb78;
    --color-cloud: #f56565;
    
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    overflow: hidden;
}

.layout {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    z-index: 20;
}

.sidebar-header {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i { width: 24px; height: 24px; color: var(--color-router); }
.logo h2 { font-size: 1.25rem; font-weight: 600; }

.status-badge {
    align-self: flex-start;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background-color: rgba(72, 187, 120, 0.1);
    color: var(--color-local);
    border-radius: 4px;
    font-family: var(--font-mono);
}

.metrics {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    border: 1px solid var(--border);
    background-color: var(--node-bg);
    padding: 1rem;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.metric-label { font-size: 0.75rem; color: var(--text-secondary); text-transform: uppercase; }
.metric-value { font-family: var(--font-mono); font-size: 1.25rem; font-weight: 500; }

.section-title { font-size: 0.85rem; color: var(--text-secondary); text-transform: uppercase; margin-bottom: 1rem; }

.button-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    overflow-y: auto;
}

.scenario-btn {
    background-color: var(--node-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-primary);
}

.scenario-btn:hover { border-color: var(--border-hover); transform: translateX(2px); }
.scenario-btn i { width: 20px; height: 20px; flex-shrink: 0; }

.high-conf i { color: var(--color-local); }
.low-conf i { color: var(--color-cloud); }
.med-sandbox-pass i, .med-sandbox-fail i, .med-judge-pass i, .med-judge-fail i { color: var(--color-verify); }

.btn-text h3 { font-size: 0.9rem; font-weight: 500; }
.btn-text p { font-size: 0.75rem; color: var(--text-secondary); margin-top: 0.2rem; }

/* Canvas */
.canvas-area {
    flex: 1;
    position: relative;
    background-image: 
        radial-gradient(#2d3748 1px, transparent 1px),
        radial-gradient(#2d3748 1px, transparent 1px);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    overflow: hidden;
}

.flow-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* Nodes */
.node {
    position: absolute;
    width: 220px;
    background: var(--node-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    transform: translate(-50%, -50%);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.3);
    z-index: 10;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
}

.node.active {
    box-shadow: 0 0 20px rgba(159, 122, 234, 0.4);
    border-color: #a0aec0;
    transform: translate(-50%, -50%) scale(1.05);
}
.node.success { box-shadow: 0 0 20px rgba(72, 187, 120, 0.4); border-color: var(--color-local); }
.node.fail { box-shadow: 0 0 20px rgba(245, 101, 101, 0.4); border-color: var(--color-cloud); }

.node-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    border-radius: 8px 8px 0 0;
}

.node-header i { width: 16px; height: 16px; }

.node-header.router { border-top: 3px solid var(--color-router); }
.node-header.verify { border-top: 3px solid var(--color-verify); }
.node-header.local { border-top: 3px solid var(--color-local); }
.node-header.cloud { border-top: 3px solid var(--color-cloud); }

.node-body {
    padding: 1rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.node-footer {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    background: rgba(0,0,0,0.2);
    border-top: 1px solid var(--border);
    border-radius: 0 0 8px 8px;
    font-family: var(--font-mono);
}

/* SVG Path Animation */
.path-flow {
    stroke-dasharray: 10 10;
    animation: flow 0.5s linear infinite;
}

@keyframes flow {
    to { stroke-dashoffset: -20; }
}