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

        body {
            font-family: 'Segoe UI', sans-serif;
            background: linear-gradient(135deg, #00c9ff, #92fe9d);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            animation: bgPulse 10s ease-in-out infinite;
            padding: 10px;
        }



        .container {
            background: rgba(255, 255, 255, 0.2);
            padding: 20px;
            border-radius: 20px;
            backdrop-filter: blur(10px);
            width: 100%;
            max-width: 900px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
            text-align: center;
            animation: slideIn 1s ease-out;
        }

        @keyframes slideIn {
            from {
                transform: translateY(50px);
                opacity: 0;
            }

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

        h1 {
            font-size: clamp(1.5em, 4vw, 2em);
            margin-bottom: 20px;
            background: linear-gradient(45deg, #ff00cc, #3333ff);
            -webkit-background-clip: text;
            color: transparent;
        }


        .details-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 15px;
            margin: 20px 0;
        }

        .detail-card {
            background: rgba(255, 255, 255, 0.15);
            padding: 15px;
            border-radius: 15px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            backdrop-filter: blur(5px);
            text-align: left;
        }

        .detail-label {
            font-size: 0.9em;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 5px;
            font-weight: 500;
        }

        .detail-value {
            font-size: 1.2em;
            color: white;
            font-weight: bold;
        }

        .instructions {
            background: rgba(255, 255, 255, 0.1);
            padding: 20px;
            border-radius: 15px;
            margin: 20px 0;
            text-align: left;
            color: white;
            line-height: 1.6;
        }

        .instructions h3 {
            margin-bottom: 15px;
            color: #ffd54f;
            text-align: center;
        }

        .instructions ul {
            list-style-position: inside;
            margin-left: 10px;
        }

        .instructions li {
            margin-bottom: 8px;
        }


        .timer-display {
            position: fixed;
            top: 20px;
            right: 20px;
            background: linear-gradient(45deg, #ff416c, #ff4b2b);
            color: white;
            padding: 10px 15px;
            border-radius: 25px;
            font-weight: bold;
            font-size: 1.1em;
            z-index: 1000;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            border: 2px solid rgba(255, 255, 255, 0.3);
            min-width: 100px;
            text-align: center;
        }

        .timer-warning {
            animation: pulse 0.5s infinite;
            background: linear-gradient(45deg, #ff1744, #d50000) !important;
        }

        @keyframes pulse {
            0% {
                transform: scale(1);
            }

            50% {
                transform: scale(1.05);
            }

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

        .live-students {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: rgba(255, 255, 255, 0.15);
            padding: 8px 14px;
            border-radius: 999px;
            margin-bottom: 18px;
            box-shadow: 0 6px 14px rgba(0, 0, 0, 0.12);
            color: #fff;
            font-weight: 600;
        }

        .live-count {
            font-size: 1.1rem;
            min-width: 70px;
            text-align: center;
            padding: 4px 8px;
            border-radius: 8px;
            background: rgba(0, 0, 0, 0.2);
        }

        .question {
            font-size: clamp(1em, 3vw, 1.2em);
            margin-bottom: 20px;
            color: #fff;
            text-align: left;
            white-space: pre-line;
            line-height: 1.4;
        }

        #explanationContent {
            max-height: 400px;
            overflow-y: auto;
            text-align: left;
            background: rgba(255, 255, 255, 0.1);
            padding: 15px;
            border-radius: 15px;
            color: white;
            line-height: 1.6;
        }

        .explanation-item {
            margin-bottom: 25px;
            padding: 15px;
            background: rgba(0, 0, 0, 0.2);
            border-radius: 10px;
        }

        .explanation-item .question-text {
            font-weight: bold;
            font-size: 1.1em;
            margin-bottom: 8px;
            color: #ffd54f;
            white-space: pre-line;
        }

        .explanation-item .correct-answer {
            font-weight: 600;
            color: #a7f5a7;
        }

        .explanation-item .user-answer {
            font-weight: 600;
            color: #f7a2a2;
        }

        .explanation-item .notes {
            font-style: italic;
            margin-top: 10px;
            font-size: 0.9em;
            color: #d1e2f7;
            white-space: pre-line;
        }

        .explanation-item .result {
            font-weight: bold;
            margin-left: 10px;
        }

        .result-correct {
            color: #a7f5a7;
        }

        .result-wrong {
            color: #f7a2a2;
        }

        .options {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-bottom: 20px;
        }

        .options button {
            background: white;
            border: none;
            padding: 15px 20px;
            font-size: clamp(0.9em, 2.5vw, 1em);
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: left;
            word-wrap: break-word;
            line-height: 1.3;
        }

        .options button.selected {
            background-color: #007bff;
            color: white;
        }

        .options button:hover {
            background: linear-gradient(45deg, #36d1dc, #5b86e5);
            color: white;
        }

        .nav-buttons {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-top: 20px;
            flex-wrap: wrap;
        }

        .nav-buttons button,
        .submit-btn,
        .skip-submit-btn {
            background: linear-gradient(45deg, #ff416c, #ff4b2b);
            color: white;
            border: none;
            padding: 12px 20px;
            font-size: clamp(0.9em, 2.5vw, 1em);
            border-radius: 30px;
            cursor: pointer;
            transition: transform 0.3s ease;
            min-width: 120px;
        }

        .nav-buttons button:hover,
        .submit-btn:hover,
        .skip-submit-btn:hover {
            transform: scale(1.05);
        }

        .skip-submit-btn {
            background: linear-gradient(45deg, #ff9900, #ff5e62);
            margin-top: 15px;
        }

        .score {
            font-size: clamp(1em, 3vw, 1.2em);
            color: white;
            white-space: pre-line;
            text-align: left;
        }

        .start-btn {
            padding: 12px 28px;
            font-size: 1.1em;
            font-weight: bold;
            color: #fff;
            border-radius: 50px;
            cursor: pointer;
            position: relative;
            z-index: 1;
            background: linear-gradient(45deg, #11998e, #38ef7d);
            border: none;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
            overflow: hidden;
        }


        .start-btn::before {
            content: "";
            position: absolute;
            top: -3px;
            left: -3px;
            right: -3px;
            bottom: -3px;
            border-radius: 55px;
            background: linear-gradient(45deg, #FF512F, #DD2476);
            background-size: 300% 300%;
            z-index: -1;
            filter: blur(6px);
            animation: glowing 4s linear infinite;
        }


        .start-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
        }


        @keyframes glowing {
            0% {
                background-position: 0 50%;
            }

            50% {
                background-position: 100% 50%;
            }

            100% {
                background-position: 0 50%;
            }
        }

        .result-buttons {
            display: flex;
            justify-content: center;
            gap: 10px;
            flex-wrap: wrap;
            margin-top: 12px;
        }

        input,
        select {
            padding: 12px;
            margin: 10px;
            width: calc(100% - 20px);
            max-width: 300px;
            border-radius: 10px;
            border: none;
            font-size: clamp(0.9em, 2.5vw, 1em);
        }


        #liveScreen,
        #graphScreen,
        #explanationScreen,
        #passwordScreen {
            display: none;
            text-align: left;
        }

        .live-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .live-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            background: #ff4b4b;
            border-radius: 50%;
            box-shadow: 0 0 8px rgba(255, 75, 75, 0.8);
            animation: pulse 1.2s infinite;
        }

        .feed {
            max-height: 300px;
            overflow-y: auto;
            background: rgba(255, 255, 255, 0.06);
            padding: 14px;
            border-radius: 12px;
            margin-bottom: 12px;
        }

        .feed-item {
            background: rgba(0, 0, 0, 0.25);
            color: #fff;
            padding: 8px 10px;
            border-radius: 10px;
            margin-bottom: 8px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .feed-left {
            font-weight: 600;
            min-width: 100px;
        }

        .feed-right {
            font-size: 1.1rem;
            font-weight: 700;
        }

        .feed-meta {
            font-size: 0.8rem;
            opacity: 0.85;
            margin-top: 6px;
        }

        .live-controls {
            display: flex;
            gap: 8px;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }

        .num-input {
            width: 110px;
            padding: 8px;
            border-radius: 8px;
            border: none;
            min-width: 80px;
        }

        .small-btn {
            padding: 8px 12px;
            border-radius: 8px;
            border: none;
            cursor: pointer;
            background: linear-gradient(45deg, #4facfe, #00f2fe);
            color: white;
            font-size: 0.9em;
        }

        .muted {
            opacity: 0.85;
            font-size: 0.9rem;
            color: #fff;
        }


        #graphScreen {
            padding: 15px;
        }

        #graphScreen h2 {
            color: white;
            margin-bottom: 15px;
            font-size: clamp(1.2em, 4vw, 1.5em);
        }

        #graphContainer {
            background: rgba(255, 255, 255, 0.1);
            padding: 10px;
            border-radius: 15px;
            position: relative;
            height: 70vh;
            max-height: 600px;
            min-height: 400px;
        }

        #graphContainer canvas {
            width: 100% !important;
            height: 100% !important;
        }

        #graphTimer {
            position: absolute;
            top: 10px;
            right: 10px;
            color: #fff;
            font-weight: bold;
            background: rgba(0, 0, 0, 0.7);
            padding: 5px 10px;
            border-radius: 5px;
            font-size: 0.9em;
            z-index: 10;
        }

        .graph-controls {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-top: 15px;
            flex-wrap: wrap;
        }

        .graph-controls button {
            background: linear-gradient(45deg, #11998e, #38ef7d);
            color: white;
            border: none;
            padding: 10px 15px;
            border-radius: 20px;
            cursor: pointer;
            transition: transform 0.3s ease;
            font-size: clamp(0.9em, 2.5vw, 1em);
        }

        .graph-controls button:hover {
            transform: scale(1.05);
        }


        @media (max-width: 768px) {
            .container {
                padding: 15px;
                margin: 5px;
            }

            .details-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }

            .timer-display {
                top: 10px;
                right: 10px;
                padding: 8px 12px;
                font-size: 1em;
                min-width: 80px;
            }

            .live-header {
                flex-direction: column;
                align-items: flex-start;
            }

            .live-controls {
                flex-direction: column;
                gap: 10px;
            }

            .feed-item {
                flex-direction: column;
                align-items: flex-start;
            }

            #graphContainer {
                height: 60vh;
                min-height: 350px;
            }

            .nav-buttons {
                flex-direction: column;
            }

            .result-buttons {
                flex-direction: column;
                align-items: center;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 10px;
            }

            h1 {
                font-size: 1.3em;
            }

            .timer-display {
                top: 5px;
                right: 5px;
                padding: 6px 10px;
                font-size: 0.9em;
                min-width: 70px;
            }

            #graphContainer {
                height: 50vh;
                min-height: 300px;
                padding: 5px;
            }
        }

        body {
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
        }


        .unlock-wrap {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            justify-content: center;
        }

        .unlock-spinner {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            border: 3px solid rgba(255, 255, 255, 0.15);
            border-top-color: rgba(255, 255, 255, 0.95);
            animation: spinSmall 0.9s linear infinite;
            display: none;

            box-shadow: 0 0 6px rgba(0, 0, 0, 0.2);
        }

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

        .unlock-status {
            color: #ffd54f;
            font-size: 0.95em;
            display: none;
            white-space: nowrap;
        }


        #unlockBtn[disabled] {
            opacity: 0.7;
            transform: none !important;
            cursor: not-allowed;
            box-shadow: none;
        }

        .instructions h3 {
            margin-bottom: 15px;
            text-align: center;
            font-size: 1.4em;
            color: #ffd54f;
            padding: 10px 20px;
            border-radius: 12px;
            background: linear-gradient(145deg, #222, #444);

            border: 3px solid transparent;
            background-clip: padding-box;
            position: relative;
        }

        .instructions h3::before {
            content: "";
            position: absolute;
            top: -3px;
            left: -3px;
            right: -3px;
            bottom: -3px;
            border-radius: 12px;
            background: linear-gradient(45deg, #ff4b2b, #ffcc00, #33ccff);
            z-index: -1;
        }


        .instructions ul li[style] {
            font-weight: bold !important;
            color: #ffeb3b !important;

        }


        #passwordMsg {
            font-weight: bold;
            color: #ffeb3b;

            font-size: 1em;
            text-shadow: 0 0 6px rgba(0, 0, 0, 0.4);

        }


        .instructions ul li.important-warning {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 14px;
            margin-top: 8px;
            border-radius: 12px;
            background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(0, 0, 0, 0.02));
            border: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.03);
            backdrop-filter: blur(6px);
            color: #fff;

            font-weight: 700;
        }


        .instructions ul li.important-warning::before {
            content: "";
            width: 8px;
            height: 100%;
            border-radius: 8px;
            background: linear-gradient(180deg, #42a5f5, #1e88e5);

            margin-left: -14px;
            margin-right: 6px;
            box-shadow: 0 2px 8px rgba(30, 136, 229, 0.25);
        }

        .instructions ul li.important-warning .warning-icon {
            flex: 0 0 auto;
            font-size: 1.05rem;
            color: #ffd54f;
            text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
        }


        .instructions ul li.important-warning {
            color: #e3f2fd;

            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
        }


        @media (max-width:480px) {
            .instructions ul li.important-warning {
                padding: 10px;
                font-size: 0.95rem;
            }

            .instructions ul li.important-warning::before {
                width: 6px;
                margin-left: -12px;
            }
        }


        .instructions ul li.important-warning {
            color: #000 !important;
        }


        .instructions ul li.important-warning .warning-icon {
            color: #000 !important;
        }


        .action-row {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 12px;
            margin-top: 18px;
            flex-wrap: wrap;
        }

        .pdf-btn {
            padding: 10px 14px;
            border-radius: 30px;
            background: linear-gradient(45deg, #ffffff, #f2f2f2);
            color: #111;
            font-weight: 700;
            border: 2px solid rgba(0, 0, 0, 0.06);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 6px 14px rgba(0, 0, 0, 0.08);
            min-width: 150px;
            justify-content: center;
        }

        .pdf-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(0, 0, 0, 0.12);
        }


        .action-row .start-btn {
            min-width: 220px;
            margin: 0 6px;
        }


        .pdf-btn.hidden {
            display: none !important;
        }


        .paid-join-btn {
            background: linear-gradient(90deg, #ff6a00 0%, #ff0066 50%, #8e2de2 100%);
            color: #fff;
            padding: 14px 26px;
            border-radius: 48px;
            font-weight: 800;
            font-size: 1.05rem;
            border: 3px solid rgba(255, 255, 255, 0.12);
            box-shadow: 0 10px 30px rgba(142, 45, 226, 0.18), inset 0 -6px 18px rgba(0, 0, 0, 0.12);
            position: relative;
            cursor: pointer;
            transition: transform 0.18s ease, box-shadow 0.18s ease;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }


        .paid-join-btn::after {
            content: "PAID";
            position: absolute;
            top: -10px;
            right: -12px;
            background: #fff;
            color: #8e2de2;
            font-weight: 900;
            font-size: 0.72rem;
            padding: 4px 8px;
            border-radius: 10px;
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
            transform: rotate(-12deg);
        }


        .paid-join-btn:hover {
            transform: translateY(-6px) scale(1.02);
            box-shadow: 0 18px 48px rgba(142, 45, 226, 0.22), inset 0 -8px 22px rgba(0, 0, 0, 0.14);
        }

        .paid-join-btn:active {
            transform: translateY(-2px) scale(0.995);
        }
        
         .statements {
            margin-top: 10px;
            padding-left: 10px;
            color: #ffd54f;
            /* Match the instructions heading color */
            font-weight: 500;
        }