:root {
    --primary-color: #7c3aed;
    --secondary-color: #a78bfa;
    --accent-color: #c084fc;
    --bg-dark: #0f0a1e;
    --bg-light: #1a1330;
    --text-light: #ffffff;
    --text-secondary: #c4b5fd;
    --border-color: #4c1d95;
    --purple-glow: #8b5cf6;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    overflow: hidden;
}

.header {
    background: var(--bg-dark);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
    border-bottom: 2px solid rgba(167, 139, 250, 0.3);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 48px;
    height: 48px;
    filter: drop-shadow(0 0 10px rgba(167, 139, 250, 0.6));
}

.logo-text h1 {
    font-size: 1.8rem;
    margin-bottom: 0.2rem;
    text-shadow: 0 0 20px rgba(167, 139, 250, 0.5);
}

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

.network-stats {
    display: flex;
    gap: 1.5rem;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(139, 92, 246, 0.15);
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(167, 139, 250, 0.2);
}

.stat-icon {
    width: 32px;
    height: 32px;
    filter: drop-shadow(0 0 8px rgba(167, 139, 250, 0.5));
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-clickable {
    cursor: pointer;
    transition: all 0.3s;
    user-select: none;
}

.stat-clickable:hover {
    background: rgba(139, 92, 246, 0.3);
    border-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.stat-clickable.active {
    background: rgba(139, 92, 246, 0.25);
    border-color: var(--accent-color);
    box-shadow: 0 0 12px rgba(192, 132, 252, 0.4);
}

.stat-clickable.active .stat-value {
    color: #fff;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--accent-color);
}

.main-container {
    display: grid;
    grid-template-columns: 300px 1fr 350px;
    height: calc(100vh - 140px);
    gap: 0;
}

.sidebar {
    background: var(--bg-light);
    padding: 1.5rem;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

.sidebar h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 0 0 10px rgba(192, 132, 252, 0.3);
}

.search-panel {
    margin-bottom: 2rem;
}

#search-input {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-light);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

#search-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.2);
}

#search-btn {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 4px;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

#search-btn:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    box-shadow: 0 4px 12px rgba(167, 139, 250, 0.5);
    transform: translateY(-1px);
}

.filter-panel {
    margin-bottom: 2rem;
}

.filter-panel label {
    display: block;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.filter-panel input[type="checkbox"] {
    margin-right: 0.5rem;
}

.filter-panel select {
    width: 100%;
    padding: 0.5rem;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-light);
    margin-top: 0.5rem;
}

.live-feed {
    margin-top: 2rem;
}

#transaction-feed {
    max-height: 400px;
    overflow-y: auto;
}

.transaction-item {
    background: var(--bg-dark);
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
    border-left: 3px solid var(--purple-glow);
    cursor: pointer;
    transition: all 0.3s;
    animation: slideIn 0.3s ease-out;
    border: 1px solid rgba(139, 92, 246, 0.1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.transaction-item:hover {
    background: rgba(139, 92, 246, 0.1);
    transform: translateX(5px);
    border-left-color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.2);
}

.tx-id {
    font-size: 0.75rem;
    color: var(--accent-color);
    font-family: monospace;
    margin-bottom: 0.25rem;
}

.tx-amount {
    font-size: 0.9rem;
    font-weight: bold;
    margin-bottom: 0.25rem;
}

.tx-time {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.visualization-area {
    position: relative;
    background: var(--bg-dark);
    overflow: hidden;
}

.controls {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 10;
    display: flex;
    gap: 0.5rem;
}

.controls button {
    min-width: 40px;
    height: 40px;
    padding: 0 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-light);
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: all 0.3s;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.controls button:hover {
    background: var(--primary-color);
    transform: scale(1.1);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.5);
}

#toggle-mode {
    padding: 0 1rem;
    font-weight: bold;
}

#toggle-mode.mode-live {
    background: rgba(16, 185, 129, 0.2);
    border-color: #10b981;
    color: #10b981;
}

#toggle-mode.mode-live:hover {
    background: rgba(16, 185, 129, 0.4);
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.5);
}

#toggle-mode.mode-demo {
    background: rgba(251, 146, 60, 0.2);
    border-color: #fb923c;
    color: #fb923c;
}

#toggle-mode.mode-demo:hover {
    background: rgba(251, 146, 60, 0.4);
    box-shadow: 0 0 12px rgba(251, 146, 60, 0.5);
}

#dag-canvas {
    width: 100%;
    height: 100%;
}

.legend {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    background: rgba(26, 19, 48, 0.95);
    padding: 1rem;
    border-radius: 8px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(139, 92, 246, 0.3);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2);
    display: flex;
    flex-direction: column;
}

.legend-item {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
}

.legend-item:last-child {
    margin-bottom: 0;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    margin-right: 0.75rem;
}

.details-panel {
    background: var(--bg-light);
    padding: 1.5rem;
    overflow-y: auto;
    border-left: 1px solid var(--border-color);
    position: relative;
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.3s;
}

.close-btn:hover {
    color: var(--text-light);
}

.details-panel h3 {
    margin-bottom: 1.5rem;
    color: var(--accent-color);
    font-size: 1.2rem;
    text-shadow: 0 0 10px rgba(192, 132, 252, 0.3);
}

#transaction-details {
    font-size: 0.9rem;
    line-height: 1.6;
}

.detail-row {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.detail-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.detail-value {
    color: var(--text-light);
    font-weight: 500;
    word-break: break-all;
}

.footer {
    background: var(--bg-light);
    padding: 0.75rem 2rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Loading indicator */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(167, 139, 250, 0.2);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s ease-in-out infinite;
    box-shadow: 0 0 8px rgba(139, 92, 246, 0.3);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive design */
@media (max-width: 1400px) {
    .main-container {
        grid-template-columns: 280px 1fr 300px;
    }
}

@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 250px 1fr;
    }
    
    .details-panel {
        position: fixed;
        right: -350px;
        top: 0;
        width: 350px;
        height: 100vh;
        z-index: 100;
        transition: right 0.3s ease;
    }
    
    .details-panel.active {
        right: 0;
    }
}

.placeholder {
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    padding: 2rem;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 10, 30, 0.7);
    backdrop-filter: blur(2px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    pointer-events: none;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(139, 92, 246, 0.2);
    border-top: 4px solid #8b5cf6;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.5);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}