:root {
            --bg-dark: #0a0a0f;
            --bg-secondary: #141420;
            --bg-tertiary: #1a1a2e;
            --accent-primary: #ff6b35;
            --accent-secondary: #7b2cbf;
            --accent-success: #2ecc71;
            --accent-danger: #e74c3c;
            --accent-gold: #f1c40f;
            --text-primary: #ecf0f1;
            --text-muted: #7f8c8d;
            --border-color: #2c2c3e;
        }

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

        body {
            font-family: 'Lato', sans-serif;
            background: var(--bg-dark);
            color: var(--text-primary);
            min-height: 100vh;
            padding: 16px;
        }

        h1, h2, h3 {
            font-family: 'Cinzel', serif;
        }

        #game-container {
            max-width: 800px;
            margin: 0 auto;
            background: var(--bg-secondary);
            border: 2px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
        }

        /* Header */
        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 24px;
            background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
            border-bottom: 2px solid var(--border-color);
        }

        header h1 {
            color: var(--accent-primary);
            font-size: 1.5rem;
            text-shadow: 0 0 20px rgba(255, 107, 53, 0.3);
        }

        .level-badge {
            background: var(--accent-secondary);
            padding: 6px 16px;
            border-radius: 20px;
            font-weight: bold;
        }

        /* Resources */
        #resources {
            display: flex;
            justify-content: space-around;
            padding: 16px;
            background: var(--bg-tertiary);
            border-bottom: 2px solid var(--border-color);
            flex-wrap: wrap;
            gap: 12px;
        }

        .resource {
            display: flex;
            align-items: center;
            gap: 8px;
            font-family: 'Fira Code', monospace;
            font-size: 1.1rem;
        }

        .resource.gold { color: var(--accent-gold); }
        .resource.souls { color: var(--accent-secondary); }
        .resource.food { color: var(--accent-danger); }
        .resource.imps { color: var(--accent-primary); }

        /* Stats */
        #stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 12px;
            padding: 16px;
            background: var(--bg-secondary);
            border-bottom: 2px solid var(--border-color);
        }

        .stat {
            text-align: center;
            padding: 8px;
            background: var(--bg-tertiary);
            border-radius: 8px;
        }

        .stat-label {
            font-size: 0.75rem;
            color: var(--text-muted);
            text-transform: uppercase;
        }

        .stat-value {
            font-family: 'Fira Code', monospace;
            font-size: 1.2rem;
            font-weight: bold;
        }

        /* Wave Status */
        #wave-status {
            padding: 16px;
            background: var(--bg-dark);
            border-bottom: 2px solid var(--border-color);
            text-align: center;
        }

        .wave-progress {
            height: 24px;
            background: var(--bg-tertiary);
            border-radius: 12px;
            overflow: hidden;
            margin-top: 8px;
            position: relative;
        }

        .wave-progress-bar {
            height: 100%;
            background: linear-gradient(90deg, var(--accent-danger), var(--accent-primary));
            border-radius: 12px;
            transition: width 0.5s ease;
        }

        .wave-progress-text {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-family: 'Fira Code', monospace;
            font-size: 0.85rem;
            font-weight: bold;
            text-shadow: 1px 1px 2px black;
        }

        /* Building Section */
        #building {
            padding: 16px;
            background: var(--bg-secondary);
            border-bottom: 2px solid var(--border-color);
        }

        #building h2 {
            margin-bottom: 12px;
            font-size: 1.2rem;
            color: var(--accent-primary);
        }

        .building-tabs {
            display: flex;
            gap: 8px;
            margin-bottom: 16px;
            flex-wrap: wrap;
        }

        .tab-btn {
            padding: 8px 16px;
            background: var(--bg-tertiary);
            border: 2px solid var(--border-color);
            border-radius: 8px;
            color: var(--text-primary);
            cursor: pointer;
            font-family: 'Lato', sans-serif;
            transition: all 0.2s ease;
        }

        .tab-btn:hover, .tab-btn.active {
            border-color: var(--accent-primary);
            background: var(--bg-dark);
        }

        .building-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            gap: 12px;
        }

        .building-card {
            padding: 16px;
            background: var(--bg-tertiary);
            border: 2px solid var(--border-color);
            border-radius: 8px;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .building-card:hover {
            border-color: var(--accent-primary);
            transform: translateY(-2px);
        }

        .building-card.disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .building-card .icon {
            font-size: 2rem;
            margin-bottom: 8px;
        }

        .building-card .name {
            font-weight: bold;
            margin-bottom: 4px;
        }

        .building-card .cost {
            font-family: 'Fira Code', monospace;
            font-size: 0.85rem;
            color: var(--accent-gold);
        }

        .building-card .effect {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* Game Log */
        #log {
            height: 150px;
            overflow-y: auto;
            padding: 16px;
            background: var(--bg-dark);
            font-family: 'Fira Code', monospace;
            font-size: 0.85rem;
        }

        .log-entry {
            padding: 4px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .log-entry.damage { color: var(--accent-danger); }
        .log-entry.gold { color: var(--accent-gold); }
        .log-entry.hero-escaped { color: var(--accent-danger); }
        .log-entry.hero-defeated { color: var(--accent-success); }
        .log-entry.wave { color: var(--accent-primary); font-weight: bold; }

        /* Imp Status */
        #imp-status {
            padding: 12px 16px;
            background: var(--bg-tertiary);
            border-top: 2px solid var(--border-color);
            text-align: center;
            font-size: 0.9rem;
        }

        /* Upgrades Section */
        #upgrades {
            padding: 16px;
            background: var(--bg-secondary);
        }

        .upgrade-card {
            padding: 12px;
            background: var(--bg-tertiary);
            border: 2px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 8px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .upgrade-info .name {
            font-weight: bold;
        }

        .upgrade-info .desc {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .upgrade-btn {
            padding: 8px 16px;
            background: var(--accent-secondary);
            border: none;
            border-radius: 6px;
            color: white;
            cursor: pointer;
            font-family: 'Lato', sans-serif;
            font-weight: bold;
        }

        .upgrade-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        /* Responsive */
        @media (max-width: 600px) {
            header h1 {
                font-size: 1.2rem;
            }
            
            .resource {
                font-size: 0.9rem;
            }
        }

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

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

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