:root {
    --bg-dark: #050510;
    --text-primary: #ffffff;
    --text-secondary: #8c9baf;
    --accent: #5e6ad2;
    --accent-glow: rgba(94, 106, 210, 0.4);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --panel-bg: rgba(15, 20, 35, 0.6);
    --border: rgba(255, 255, 255, 0.1);
    
    --node-merchant: #3b82f6;
    --node-gateway: #8b5cf6;
    --node-bank: #10b981;
    --node-customer: #f59e0b;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    overflow: hidden;
    width: 100vw;
    height: 100vh;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.overlay {
    position: relative;
    z-index: 10;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

header {
    position: absolute;
    top: 2rem;
    left: 2rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.highlight {
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.2rem;
}

.hud {
    position: absolute;
    backdrop-filter: blur(12px);
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    pointer-events: auto;
}

.panel-left {
    top: 50%;
    left: 2rem;
    transform: translateY(-50%);
    width: 250px;
}

.panel-right {
    top: 50%;
    right: 2rem;
    transform: translateY(-50%);
    width: 300px;
}

h2 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    margin-top: 0;
}

.metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    padding-bottom: 0.5rem;
}

.metric .label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.metric .value {
    font-size: 1.25rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.control-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.btn {
    flex: 1;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn:hover {
    background: rgba(255,255,255,0.1);
}

.btn.active {
    background: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-glow);
}

.btn.danger:hover {
    background: var(--danger);
    border-color: var(--danger);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
}

.log-container {
    height: 150px;
    overflow-y: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: rgba(0,0,0,0.3);
    border-radius: 6px;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.log-entry {
    animation: fadeIn 0.3s;
}

.log-entry.tx { color: var(--success); }
.log-entry.err { color: var(--danger); }
.log-entry.sys { color: var(--accent); }

@keyframes fadeIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

footer {
    position: absolute;
    bottom: 2rem;
    left: 2rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--panel-bg);
    padding: 0.5rem 1rem;
    border-radius: 99px;
    border: 1px solid var(--border);
    font-size: 0.8rem;
    font-weight: 600;
    backdrop-filter: blur(12px);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Scrollbar customized for log container */
::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 4px;
}