body {
            background: linear-gradient(135deg, #0d1117, #1f2937);
            font-family: 'Hind Siliguri', sans-serif;
            margin: 0;
            color: #fff;
            line-height: 1.6;
        }
        .container {
            max-width: 950px;
            margin: 30px auto;
            padding: 30px;
            background: rgba(255,255,255,0.05);
            border-radius: 15px;
            box-shadow: 0 0 25px rgba(0,255,255,0.2);
        }
        .logo {
            text-align: center;
            margin-bottom: 15px;
        }
        .logo img {
            max-width: 130px;
            filter: drop-shadow(0 0 30px black);
        }
        h1 {
            text-align: center;
            color: White;
            text-shadow: 0 0 7px black;
            margin-bottom: 20px;
            font-size: 28px;
        }
        .section-heading {
            font-size: 20px;
            color: #17acfd;
            margin: 20px 0 10px;
            font-weight: bold;
            text-align: left;
            border-bottom: 2px solid #c1acfd;
            padding-bottom: 5px;
        }
        .progress-bar {
            background: #111;
            height: 8px;
            border-radius: 4px;
            margin: 20px 0;
            overflow: hidden;
        }
        .progress-fill {
            background: linear-gradient(90deg, #00ff99, #c1acfd);
            height: 100%;
            transition: width 0.5s ease;
        }
        .input-group {
            margin-bottom: 20px;
            position: relative;
        }
        label {
            display: block;
            margin-bottom: 6px;
            font-weight: bold;
            font-size: 15px;
        }
        input[type="text"] {
            width: calc(100% - 50px);
            padding: 12px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            background: #111;
            color: #fff;
            box-shadow: inset 0 0 6px rgba(0,255,255,0.4);
        }
        .mic {
            position: absolute;
            right: 9px;
            top: 20px;
            background: #ffcc00;
            color: #000;
            border: none;
            border-radius: 50%;
            width: 36px;
            height: 36px;
            cursor: pointer;
            box-shadow: 0 0 10px rgba(255, 204, 0, 0.6);
        }
        .mic::before {
            content: "🎤 ";
            font-size: 18px;
        }
        .question {
            margin-bottom: 15px;
            padding: 15px;
            background-color: rgba(255,255,255,0.05);
            border-radius: 10px;
            box-shadow: 0 0 12px rgba(0,255,255,0.1);
        }
        .options {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .option {
            flex: 1 1 45%;
            padding: 10px;
            background: #111;
            border-radius: 8px;
            cursor: pointer;
            text-align: center;
            transition: .3s;
            border: 1px solid transparent;
        }
        .option:hover {
            background: #222;
        }
        input[type="radio"] {
            display: none;
        }
        input[type="radio"]:checked + .option {
            background: #ffcc00;
            color: #000;
            border: 1px solid #ffcc00;
        }
      
        /* 🎨 ALL BUTTONS - PERFECT YELLOW + SHADOW (সম্পূর্ণ নতুন!) */
        button, input[type="submit"] {
            width: 100%;
            padding: 14px;
            font-size: 18px;
            font-weight: bold;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            margin-top: 15px;
            transition: all .3s ease;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
            box-shadow: 0 4px 15px rgba(255, 204, 0, 0.4);
            background: #ffcc00 !important;
            color: #000 !important;
        }

        button:hover, input[type="submit"]:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 204, 0, 0.6);
            background: #ffd633 !important; /* একটু গাঢ় ইয়েলো */
        }

        button:active, input[type="submit"]:active {
            transform: translateY(0);
            background: #ffcc00 !important; /* CLICK এ ইয়েলোই থাকবে */
            box-shadow: 0 4px 15px rgba(255, 204, 0, 0.4);
        }

        /* অ্যাক্টিভ বাটনের জন্য নতুন স্টাইল */
        button.active, input[type="submit"].active {
            background: #ffcc00 !important;
            color: #000 !important;
            box-shadow: 0 4px 15px rgba(255, 204, 0, 0.6);
            transform: scale(1.05);
        }

        .start, .submit, .next-section, #validate-btn, #finalSubmit {
            background: #ffcc00 !important;
            color: #000 !important;
        }

        .start:hover, .submit:hover, .next-section:hover, #validate-btn:hover, #finalSubmit:hover {
            background: #ffd633 !important;
        }

        .start:active, .submit:active, .next-section:active, #validate-btn:active, #finalSubmit:active {
            background: #ffcc00 !important;
        }

        #validate-btn {
            background: #ffcc00 !important;
            color: #000 !important;
            width: auto;
            padding: 12px 30px;
            display: block;
            margin: 25px auto 0;
        }

        #finalSubmit {
            background: #ffcc00 !important;
            color: #000 !important;
        }
      
        .result-feedback {
            margin-top: 10px;
            padding: 10px;
            border-radius: 8px;
            font-size: 15px;
            line-height: 1.5;
        }
        .correct-ans {
            background: rgba(0, 255, 153, 0.1);
            border: 1px solid #99ffcc;
            color: #99ffcc;
        }
        .wrong-ans {
            background: rgba(255, 68, 68, 0.1);
            border: 1px solid #ff4444;
            color: #ff4444;
        }
        .section {
            display: none;
        }
        .section.active {
            display: block;
        }
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.7);
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }
        .modal-content {
            background: #111;
            color: #fff;
            padding: 25px;
            border-radius: 12px;
            max-width: 90%;
            width: 90%;
            box-shadow: 0 0 20px cyan;
            max-height: 80vh;
            overflow-y: auto;
        }
        /* Drag & Drop Styles */
        .options-zone {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            border: 2px solid #ffcc00;
            padding: 10px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.1);
            margin-bottom: 20px;
            min-height: 80px;
        }
        .drag-option {
            background: #ffcc00;
            color: #0d1117;
            padding: 4px 7px;
            border-radius: 20px;
            margin: 6px;
            cursor: grab;
            font-weight: 700;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
            font-size: 18px;
            min-width: 100px;
            max-width: 110px;
            height: 40px;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .questions-zone {
            background: rgba(0, 0, 0, 0.3);
            border-radius: 10px;
            padding: 15px;
        }
        .question-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 10px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .fill-text {
            flex-grow: 1;
            font-size: 17px;
            padding-right: 15px;
        }
        .drop-target, .filled-target {
            width: 180px;
            min-height: 45px;
            border: 2px dashed cyan;
            border-radius: 10px;
            color: #ccc;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 255, 255, 0.08);
        }
        .drop-target.drag-over {
            border-color: #ffcc00;
            background: rgba(255, 204, 0, 0.1);
        }
        @media (max-width: 768px) {
            .container { margin: 0; padding: 15px; }
            .option { flex: 1 1 100%; }
            .drop-target, .filled-target { width: 100%; margin-top: 10px; }
        }