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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #020617 0%, #0f172a 50%, #1e293b 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            color: #e2e8f0;
        }

        .container {
            max-width: 900px;
            width: 100%;
        }

        /* HEADER */
        .header {
            text-align: center;
            margin-bottom: 40px;
            animation: fadeIn 0.8s ease;
        }

        .header h1 {
            font-size: 3em;
            background: linear-gradient(45deg, #38bdf8 0%, #0ea5e9 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 10px;
            font-weight: 700;
            background-clip: text;
        }

        .header p {
            color: #94a3b8;
            font-size: 1.1em;
        }

        /* STATS */
        .stats {
            display: flex;
            justify-content: space-around;
            margin-bottom: 30px;
            gap: 20px;
            animation: slideUp 0.8s ease;
        }

        .stat-card {
            background: rgba(255, 255, 255, 0.03);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(147, 197, 253, 0.15);
            border-radius: 0;
            padding: 20px;
            text-align: center;
            flex: 1;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(56, 189, 248, 0.3);
        }

        .stat-label {
            color: #64748b;
            font-size: 0.9em;
            margin-bottom: 8px;
        }

        .stat-value {
            font-size: 2em;
            font-weight: bold;
            background: linear-gradient(45deg, #38bdf8, #0ea5e9);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* QUIZ CARD */
        .quiz-card {
            background: rgba(255, 255, 255, 0.04);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(147, 197, 253, 0.15);
            border-radius: 0;
            padding: 40px;
            margin-bottom: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
            animation: slideUp 0.8s ease;
        }

        .question-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
        }

        .question-number {
            font-size: 1.1em;
            color: #94a3b8;
        }

        /* HEARTS */
        .lives {
            display: flex;
            gap: 8px;
        }

        .heart {
            font-size: 1.5em;
            transition: transform 0.3s ease;
        }

        .heart.lost {
            opacity: 0.2;
            transform: scale(0.8);
        }

        /* CODE BLOCK */
        .code-block {
            background: #0f172a;
            border-radius: 0;
            padding: 25px;
            margin: 25px 0;
            overflow-x: auto;
            border: 1px solid rgba(56, 189, 248, 0.25);
            box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.4);
        }

        .code-block pre {
            color: #e2e8f0;
            font-family: 'Courier New', monospace;
            font-size: 1em;
            line-height: 1.6;
        }

        /* QUESTION TEXT */
        .question-text {
            font-size: 1.3em;
            margin-bottom: 20px;
            color: #e2e8f0;
        }

        /* OPTIONS */
        .options {
            display: grid;
            /* grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); */
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin-top: 25px;
        }

        .option-btn {
            background: rgba(255, 255, 255, 0.05);
            border: 2px solid rgba(56, 189, 248, 0.3);
            color: #e2e8f0;
            padding: 18px 25px;
            border-radius: 0;
            font-size: 1.05em;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
        }

        .option-btn:hover {
            background: rgba(56, 189, 248, 0.15);
            border-color: #38bdf8;
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(56, 189, 248, 0.25);
        }

        .option-btn.correct {
            background: rgba(16, 185, 129, 0.2);
            border-color: #10b981;
            animation: pulse 0.5s ease;
        }

        .option-btn.incorrect {
            background: rgba(239, 68, 68, 0.2);
            border-color: #ef4444;
            animation: shake 0.5s ease;
        }

        .option-btn:disabled {
            cursor: not-allowed;
            opacity: 0.6;
        }

        /* START + END SCREENS */
        .start-screen,
        .end-screen {
            text-align: center;
            animation: fadeIn 0.8s ease;
        }

        .start-screen h2,
        .end-screen h2 {
            font-size: 2.5em;
            margin-bottom: 20px;
            background: linear-gradient(45deg, #38bdf8, #0ea5e9);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .start-screen p,
        .end-screen p {
            font-size: 1.2em;
            color: #94a3b8;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        /* BUTTONS */
        .btn-primary {
            background: linear-gradient(45deg, #38bdf8, #0ea5e9);
            color: #fff;
            border: none;
            padding: 18px 50px;
            font-size: 1.2em;
            border-radius: 0;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
            box-shadow: 0 10px 30px rgba(56, 189, 248, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 40px rgba(56, 189, 248, 0.6);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.05);
            color: #e2e8f0;
            border: 2px solid rgba(255, 255, 255, 0.15);
            padding: 15px 40px;
            font-size: 1.1em;
            border-radius: 0;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
            margin-left: 15px;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        /* END STATS */
        .final-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .final-stat {
            background: rgba(255, 255, 255, 0.05);
            padding: 25px;
            border-radius: 0;
            border: 1px solid rgba(147, 197, 253, 0.15);
        }

        .final-stat-label {
            color: #94a3b8;
            margin-bottom: 10px;
        }

        .final-stat-value {
            font-size: 2.5em;
            font-weight: bold;
            background: linear-gradient(45deg, #38bdf8, #0ea5e9);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* ANIMATIONS */
        @keyframes fadeIn {
            from {
                opacity: 0;
            }

            to {
                opacity: 1;
            }
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes pulse {

            0%,
            100% {
                transform: scale(1);
            }

            50% {
                transform: scale(1.05);
            }
        }

        @keyframes shake {

            0%,
            100% {
                transform: translateX(0);
            }

            25% {
                transform: translateX(-10px);
            }

            75% {
                transform: translateX(10px);
            }
        }

        .hidden {
            display: none;
        }

        /* RESPONSIVE */
        @media (max-width: 768px) {
            .header h1 {
                font-size: 2em;
            }

            .quiz-card {
                padding: 25px;
            }

            .options {
                grid-template-columns: 1fr;
            }
        }