@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600&display=swap');
        
        :root {
            /* Lofi theme */
            --bg-primary: #1a1a1a;
            --bg-secondary: #2d2d2d;
            --bg-tertiary: #3a3a3a;
            --text-primary: #e8e6e3;
            --text-secondary: #b8b5b2;
            --accent: #d4a574;
            --accent-hover: #e6b685;
            --shadow: rgba(0, 0, 0, 0.3);
            --glow: rgba(212, 165, 116, 0.2);
        }
        
        [data-theme="bw"] {
            --bg-primary: #0a0a0a;
            --bg-secondary: #1a1a1a;
            --bg-tertiary: #2a2a2a;
            --text-primary: #ffffff;
            --text-secondary: #cccccc;
            --accent: #ffffff;
            --accent-hover: #f0f0f0;
            --shadow: rgba(0, 0, 0, 0.5);
            --glow: rgba(255, 255, 255, 0.1);
        }
        
        [data-theme="cyber"] {
            --bg-primary: #0a0a0f;
            --bg-secondary: #151520;
            --bg-tertiary: #202030;
            --text-primary: #00d4ff;
            --text-secondary: #80e6ff;
            --accent: #00aaff;
            --accent-hover: #33bbff;
            --shadow: rgba(0, 170, 255, 0.3);
            --glow: rgba(0, 212, 255, 0.3);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'JetBrains Mono', monospace;
            background: var(--bg-primary);
            color: var(--text-primary);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            overflow-x: hidden;
        }
        
        .container {
            max-width: 600px;
            width: 90%;
            background: var(--bg-secondary);
            border-radius: 20px;
            padding: 2rem;
            box-shadow: 0 20px 40px var(--shadow);
            backdrop-filter: blur(10px);
            border: 1px solid var(--bg-tertiary);
            position: relative;
            overflow: hidden;
        }
        
        .container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--accent), transparent);
            animation: shimmer 3s infinite;
        }
        
        @keyframes shimmer {
            0%, 100% { opacity: 0.3; }
            50% { opacity: 1; }
        }
        
        .header {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .title {
            font-size: 2.5rem;
            font-weight: 600;
            color: var(--accent);
            margin-bottom: 0.5rem;
            text-shadow: 0 0 20px var(--glow);
        }
        
        .subtitle {
            color: var(--text-secondary);
            font-size: 1rem;
            font-weight: 300;
        }
        
        .theme-selector {
            display: flex;
            gap: 1rem;
            justify-content: center;
            margin-bottom: 2rem;
        }
        
        .theme-btn {
            padding: 0.5rem 1rem;
            background: var(--bg-tertiary);
            border: 2px solid transparent;
            border-radius: 10px;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: inherit;
            font-size: 0.9rem;
        }
        
        .theme-btn:hover, .theme-btn.active {
            border-color: var(--accent);
            color: var(--accent);
            box-shadow: 0 0 15px var(--glow);
        }
        
        .angle-display {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .angle-visual {
            width: 200px;
            height: 200px;
            margin: 0 auto 1rem;
            position: relative;
            border: 2px solid var(--accent);
            border-radius: 50%;
            background: radial-gradient(circle at center, var(--bg-tertiary), var(--bg-secondary));
        }
        
        .reference-line {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 90px;
            height: 1px;
            background: var(--text-secondary);
            transform-origin: left center;
            opacity: 0.6;
            z-index: 1;
        }
        
        .angle-line {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 80px;
            height: 3px;
            background: var(--accent);
            transform-origin: left center;
            transition: transform 0.5s ease;
            box-shadow: 0 0 10px var(--glow);
            z-index: 2;
        }
        
        .angle-arc {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            transform: translate(-50%, -50%);
            opacity: 0.6;
            background: none;
            border: none;
        }
        
        .current-angle {
            font-size: 2rem;
            font-weight: 500;
            color: var(--accent);
            margin-bottom: 0.5rem;
        }
        
        .game-section {
            margin-bottom: 2rem;
        }
        
        .input-group {
            display: flex;
            gap: 1rem;
            justify-content: center;
            align-items: center;
            margin-bottom: 1rem;
        }
        
        .angle-input {
            padding: 0.75rem 1rem;
            background: var(--bg-tertiary);
            border: 2px solid var(--bg-tertiary);
            border-radius: 10px;
            color: var(--text-primary);
            font-family: inherit;
            font-size: 1rem;
            width: 120px;
            text-align: center;
            transition: all 0.3s ease;
        }
        
        .angle-input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 15px var(--glow);
        }
        
        .guess-btn {
            padding: 0.75rem 1.5rem;
            background: var(--accent);
            color: var(--bg-primary);
            border: none;
            border-radius: 10px;
            font-family: inherit;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }
        
        .guess-btn:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 10px 20px var(--glow);
        }
        
        .guess-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }
        
        .feedback {
            text-align: center;
            padding: 1rem;
            border-radius: 10px;
            margin-bottom: 1rem;
            min-height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-tertiary);
            border: 1px solid var(--bg-tertiary);
        }
        
        .guess-history {
            text-align: center;
            margin-bottom: 1rem;
            padding: 0.75rem;
            background: var(--bg-tertiary);
            border-radius: 10px;
            border: 1px solid var(--bg-tertiary);
            min-height: 50px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        
        .history-label {
            color: var(--text-secondary);
            font-size: 0.85rem;
            margin-bottom: 0.5rem;
            font-weight: 300;
        }
        
        .history-guesses {
            display: flex;
            justify-content: center;
            gap: 0.75rem;
            flex-wrap: wrap;
        }
        
        .history-guess {
            padding: 0.25rem 0.5rem;
            background: var(--bg-primary);
            border-radius: 6px;
            color: var(--text-primary);
            font-size: 0.9rem;
            border: 1px solid var(--accent);
            opacity: 0.8;
        }
        
        .feedback.show {
            animation: fadeInUp 0.5s ease;
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .stats {
            display: flex;
            justify-content: space-around;
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .stat {
            color: var(--text-secondary);
        }
        
        .stat-value {
            display: block;
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--accent);
        }
        
        .new-game-btn {
            width: 100%;
            padding: 1rem;
            background: var(--bg-tertiary);
            border: 2px solid var(--accent);
            border-radius: 10px;
            color: var(--accent);
            font-family: inherit;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .new-game-btn:hover {
            background: var(--accent);
            color: var(--bg-primary);
            box-shadow: 0 0 20px var(--glow);
        }
        
        .emoji {
            font-size: 1.5rem;
            margin-right: 0.5rem;
        }