:root {
            --primary: #fff;
            --primary-dark: #003366;
            --primary-light: #3a75c7;
            --secondary: #e37222;
            --secondary-light: #f18c4e;
            --success: #4caf50;
            --danger: #f44336;
            --warning: #ff9800;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --gray-light: #e9ecef;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4eaf1 100%);
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
            padding: 20px;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .container {
            max-width: 800px;
            width: 100%;
            background: white;
            border-radius: 20px;
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
            overflow: hidden;
            position: relative;
        }
        
        .header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            padding: 25px;
            text-align: center;
            position: relative;
        }
        
        .logo-container {
          display: flex;
          justify-content: center;
          align-items: center;
          margin-bottom: 15px;
        }
        
        .logo {
          max-width: 200px;
          max-height: 180px;
          width: auto;
          height: auto;
          object-fit: contain;
        }
        
        h1 {
            font-size: 32px;
            margin-bottom: 12px;
            font-weight: 700;
        }
        
        h2 {
            font-size: 26px;
            margin-bottom: 18px;
            color: var(--primary);
            font-weight: 600;
        }
        
        h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: var(--primary);
            font-weight: 600;
        }
        
        .subtitle {
            font-size: 18px;
            opacity: 0.9;
            margin-bottom: 25px;
            font-weight: 400;
        }
        
        .screen {
            display: none;
            padding: 35px;
        }
        
        .screen.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(15px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .btn {
            display: inline-block;
            background: linear-gradient(to right, var(--primary) 0%, var(--primary-light) 100%);
            color: white;
            border: none;
            padding: 14px 30px;
            font-size: 17px;
            font-weight: 600;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
            margin: 12px 6px;
            box-shadow: 0 5px 15px rgba(0, 76, 151, 0.3);
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 76, 151, 0.4);
        }
        
        .btn-secondary {
            background: linear-gradient(to right, var(--secondary) 0%, var(--secondary-light) 100%);
            box-shadow: 0 5px 15px rgba(227, 114, 34, 0.3);
        }
        
        .btn-secondary:hover {
            box-shadow: 0 8px 20px rgba(227, 114, 34, 0.4);
        }
        
        .btn-admin {
            position: absolute;
            top: 25px;
            right: 25px;
            background: rgba(255, 255, 255, 0.25);
            width: 45px;
            height: 45px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            backdrop-filter: blur(5px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all 0.3s;
        }
        
        .btn-admin:hover {
            background: rgba(255, 255, 255, 0.4);
            transform: rotate(90deg);
        }
        
        .form-group {
            margin-bottom: 25px;
            text-align: left;
        }
        
        label {
            display: block;
            margin-bottom: 10px;
            font-weight: 600;
            color: var(--primary);
            font-size: 16px;
        }
        
        input, select {
            width: 100%;
            padding: 15px 18px;
            border: 2px solid var(--gray-light);
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s;
            background: white;
        }
        
        input:focus, select:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 4px rgba(0, 76, 151, 0.15);
            transform: translateY(-2px);
        }
        
        .checkbox-container {
            display: flex;
            align-items: center;
            margin: 25px 0;
            padding: 15px;
            background: var(--gray-light);
            border-radius: 10px;
        }
        
        .checkbox-container input {
            width: auto;
            margin-right: 12px;
            transform: scale(1.2);
        }
        
        .quiz-image {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
            margin: 20px 0;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            border: 1px solid #eee;
        }
        
        .options-container {
            display: grid;
            gap: 15px;
            margin: 25px 0;
        }
        
        .option-btn {
            background: white;
            border: 2px solid var(--gray-light);
            padding: 18px 20px;
            border-radius: 12px;
            text-align: left;
            font-size: 17px;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            align-items: center;
        }
        
        .option-btn:hover {
            border-color: var(--primary-light);
            background: #f0f7ff;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .option-btn.correct {
            background: #e8f5e9;
            border-color: var(--success);
            color: var(--success);
        }
        
        .option-btn.incorrect {
            background: #ffebee;
            border-color: var(--danger);
            color: var(--danger);
        }
        
        .progress-container {
            margin: 25px 0;
            background: var(--gray-light);
            border-radius: 50px;
            height: 12px;
            overflow: hidden;
            box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
        }
        
        .progress-bar {
            height: 100%;
            background: linear-gradient(to right, var(--primary) 0%, var(--primary-light) 100%);
            width: 0%;
            transition: width 0.5s ease;
            border-radius: 50px;
        }
        
        .progress-text {
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            font-size: 16px;
            display: flex;
            justify-content: space-between;
        }
        
        .result-container {
            text-align: center;
            padding: 35px;
        }
        
        .score-display {
            font-size: 80px;
            font-weight: 800;
            color: var(--primary);
            margin: 25px 0;
            position: relative;
            display: inline-block;
        }
        
        .score-display::after {
            content: "";
            position: absolute;
            bottom: -10px;
            left: 10%;
            width: 80%;
            height: 6px;
            background: linear-gradient(to right, var(--primary) 0%, var(--primary-light) 100%);
            border-radius: 3px;
        }
        
        .result-message {
            font-size: 22px;
            margin: 25px 0;
            padding: 20px;
            border-radius: 12px;
            font-weight: 600;
        }
        
        .qualified {
            background: #e8f5e9;
            color: #2e7d32;
            border-left: 5px solid var(--success);
        }
        
        .not-qualified {
            background: #ffebee;
            color: #c62828;
            border-left: 5px solid var(--danger);
        }
        
        .winner-animation {
            font-size: 52px;
            margin: 25px 0;
            animation: bounce 1s infinite alternate;
        }
        
        @keyframes bounce {
            from { transform: translateY(0); }
            to { transform: translateY(-12px); }
        }
        
        .admin-panel {
            padding: 25px;
        }
        
        .admin-actions {
            display: flex;
            justify-content: center;
            gap: 18px;
            margin: 25px 0;
            flex-wrap: wrap;
        }
        
        .leads-list {
            max-height: 400px;
            overflow-y: auto;
            border: 1px solid var(--gray-light);
            border-radius: 12px;
            padding: 20px;
            margin-top: 25px;
            background: var(--light);
        }
        
        .lead-item {
            padding: 18px;
            border-bottom: 1px solid var(--gray-light);
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.2s;
        }
        
        .lead-item:hover {
            background: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .lead-item:last-child {
            border-bottom: none;
        }
        
        .qualified-badge {
            background: var(--success);
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
        }
        
        .not-qualified-badge {
            background: var(--gray);
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
        }
        
        .footer {
            text-align: center;
            padding: 25px;
            color: var(--gray);
            font-size: 15px;
            border-top: 1px solid var(--gray-light);
            margin-top: 20px;
            background: var(--light);
        }
        
        .error-message {
            color: var(--danger);
            margin-top: 8px;
            font-size: 14px;
            display: none;
            font-weight: 500;
        }
        
        .winners-container {
            margin: 25px 0;
            padding: 20px;
            background: var(--light);
            border-radius: 12px;
            border-left: 5px solid var(--success);
        }
        
        .winner-item {
            padding: 15px;
            margin: 12px 0;
            background: white;
            border-radius: 10px;
            border-left: 4px solid var(--success);
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
        }
        
        .info-text {
            background: var(--gray-light);
            padding: 15px;
            border-radius: 10px;
            margin: 15px 0;
            font-size: 15px;
            line-height: 1.5;
        }
        
        .icon {
            margin-right: 10px;
            font-size: 20px;
        }
        
        /* Admin κουμπί διακριτικό, μόνο στην αρχική */
        .hidden-admin{
          position: fixed; /* να μένει κάτω δεξιά */
          right: 16px;
          bottom: 16px;
          width: 40px; height: 40px;
          border-radius: 50%;
          background: #004c97;
          color: #fff;
          border: 0;
          opacity: .35;
          cursor: pointer;
          display: none; /* default: δεν φαίνεται */
          box-shadow: 0 6px 14px rgba(0,0,0,.15);
        }
        .hidden-admin:hover{ opacity: .8; }
        
        /* Δείξ’ το ΜΟΝΟ όταν η αρχική είναι ενεργή */
        .screen.active#welcome-screen .hidden-admin { display: inline-flex; align-items:center; justify-content:center; }

        /* ---- FIX options & image ---- */
        #options{
          display: grid;
          gap: 15px;
          margin: 25px 0;
        }
        
        .option-btn{
          width: 100%;
          background: #fff;
          border: 2px solid var(--gray-light);
          color: var(--dark) !important;  /* override της .btn που κάνει το κείμενο λευκό */
          padding: 18px 20px;
          border-radius: 12px;
          text-align: left;
          font-size: 17px;
          display: flex;
          align-items: center;
          justify-content: flex-start;
          transition: all .2s;
        }
        
        .option-btn:hover{
          border-color: var(--primary-light);
          background: #f0f7ff;
          transform: translateY(-2px);
          box-shadow: 0 5px 15px rgba(0,0,0,.05);
        }
        
        .option-btn.correct{
          background: #e8f5e9;
          border-color: var(--success);
          color: var(--success) !important;
        }
        .option-btn.incorrect{
          background: #ffebee;
          border-color: var(--danger);
          color: var(--danger) !important;
        }
        
        /* Το πραγματικό id της εικόνας είναι #question-image */
        #question-image{
          max-width: 100%;
          height: auto;
          border-radius: 12px;
          margin: 20px 0;
          box-shadow: 0 8px 20px rgba(0,0,0,.1);
          border: 1px solid #eee;
        }
        
        /* ---- Progress Bar FIX ---- */
        .progress-container{
          padding: 10px 0 6px;
        }
        
        .progress{
          width: 100%;
          height: 10px;                 /* ορατό ύψος */
          background: #e9eef5;          /* ανοιχτό γκρι ώστε να ξεχωρίζει */
          border-radius: 999px;
          overflow: hidden;             /* να “κόβεται” η μπάρα στις άκρες */
          box-shadow: inset 0 1px 2px rgba(0,0,0,.08);
        }
        
        .progress-bar{
          width: 0;                     /* ενημερώνεται από JS */
          height: 100%;
          background: linear-gradient(90deg,#4da3ff,#0069d9); /* έντονο μπλε */
          transition: width .35s ease;  /* smooth */
        }
        
        .progress-info{
          margin-top: 6px;
          font-size: 14px;
          color: #2a4c7b;               /* σκουρό μπλε κείμενο για να φαίνεται */
          font-weight: 600;
        }

        /* ===== ELVIAL MONOCHROME THEME ===== */
        :root{
          --mono-900:#111;   /* black-ish */
          --mono-800:#1a1a1a;
          --mono-700:#222;
          --mono-600:#333;
          --mono-500:#555;
          --mono-400:#777;
          --mono-300:#bdbdbd;
          --mono-200:#e6e6e6;
          --mono-150:#efefef;
          --mono-100:#f7f7f7;
          --white:#fff;
        }
        
        /* Φόντο σελίδας */
        body{ background: var(--mono-100); color: var(--mono-700); }
        
        /* Header/hero */
        .header{
          background: linear-gradient(180deg, var(--mono-800) 0%, var(--mono-700) 100%);
          color: var(--white);
        }
        .header h1{ color: var(--white); }
        .subtitle{ color: #dcdcdc; }
        
        /* Buttons */
        .btn{ border:1px solid transparent; }
        .btn.btn-primary{
          background: var(--mono-800);
          border-color: var(--mono-800);
          color: var(--white);
        }
        .btn.btn-primary:hover{ background: var(--mono-900); border-color: var(--mono-900); }
        
        .btn.btn-secondary{
          background: var(--white);
          color: var(--mono-800);
          border-color: var(--mono-300);
        }
        .btn.btn-secondary:hover{ background: var(--mono-150); border-color: var(--mono-600); }
        
        /* Αν έχεις πορτοκαλί cancel, το γυρίζουμε σε γκρι */
        .btn-cancel, .btn.btn-accent{
          background: var(--mono-600) !important;
          border-color: var(--mono-600) !important;
          color: var(--white) !important;
        }
        .btn-cancel:hover, .btn.btn-accent:hover{
          background: var(--mono-800) !important; border-color: var(--mono-800) !important;
        }
        
        /* Admin button (γρανάζι) */
        .hidden-admin{ background: var(--mono-800); color: var(--white); }
        .hidden-admin:hover{ background: var(--mono-900); }
        
        /* Progress */
        .progress{ background: var(--mono-200); }
        .progress-bar{
          background: linear-gradient(90deg, var(--mono-600), var(--mono-900));
        }
        
        /* Τίτλοι */
        #quiz-screen h2, #result-screen h2 { color: var(--mono-800); }
        
        /* Επιλογές απαντήσεων */
        #options{ display:grid; gap:15px; margin:25px 0; }
        .option-btn{
          background: var(--white);
          border: 2px solid var(--mono-200);
          color: var(--mono-700) !important;
          padding: 18px 20px;
          border-radius: 12px;
          text-align: left;
          font-size: 17px;
          display:flex; align-items:center; justify-content:flex-start;
          transition: all .2s;
        }
        .option-btn:hover{
          background: var(--mono-100);
          border-color: var(--mono-300);
          transform: translateY(-1px);
          box-shadow: 0 6px 16px rgba(0,0,0,.06);
        }
        /* Μονόχρωμη ένδειξη σωστής/λάθους */
        .option-btn.correct{
          background: #f2f2f2;
          border-color: var(--mono-800);
          color: var(--mono-800) !important;
          box-shadow: inset 0 0 0 2px var(--mono-800);
        }
        .option-btn.incorrect{
          background: var(--mono-100);
          border-color: var(--mono-300);
          color: var(--mono-500) !important;
          opacity: .9;
        }
        
        /* Εικόνα ερώτησης */
        #question-image{
          max-width:100%; height:auto; border-radius:12px;
          margin:20px 0; border:1px solid var(--mono-200);
          box-shadow: 0 8px 20px rgba(0,0,0,.08);
        }
        
        /* Links */
        a, .link{ color: var(--mono-800); }
        a:hover, .link:hover{ color: var(--mono-900); }
        
        /* Focus ring προσβασιμότητας */
        button:focus, input:focus, select:focus{
          outline: 3px solid rgba(0,0,0,.25);
          outline-offset: 2px;
          box-shadow: 0 0 0 2px rgba(0,0,0,.15);
        }

        /* ===== TEXT COLOR FIXES ===== */
        
        /* Όλα τα βασικά κείμενα */
        body,
        #welcome-screen,
        #lead-form-screen,
        #welcome-screen h1,
        #welcome-screen h2,
        #welcome-screen h3,
        #welcome-screen p,
        #lead-form-screen h1,
        #lead-form-screen h2,
        #lead-form-screen h3,
        #lead-form-screen p,
        label,
        input,
        select,
        textarea {
          color: #111 !important;  /* βαθύ μαύρο */
        }
        
        /* Τίτλοι quiz, φόρμας, result */
        #quiz-screen h1,
        #quiz-screen h2,
        #quiz-screen p,
        #result-screen h1,
        #result-screen h2,
        #result-screen p {
          color: #111 !important;
        }
        
        /* Links */
        a, .link {
          color: #111 !important;
        }
        a:hover, .link:hover {
          color: #000 !important;
        }
        
        /* Buttons: το κείμενο να είναι λευκό μόνο στα primary */
        .btn.btn-primary {
          color: #fff !important;
        }
        .btn.btn-secondary,
        .btn.btn-cancel {
          color: #111 !important;
        }

        
        @media (max-width: 768px) {
            body {
                padding: 15px;
            }
            
            .container {
                border-radius: 15px;
            }
            
            h1 {
                font-size: 28px;
            }
            
            h2 {
                font-size: 23px;
            }
            
            h3 {
                font-size: 20px;
            }
            
            .screen {
                padding: 25px;
            }
            
            .admin-actions {
                flex-direction: column;
            }
            
            .btn {
                width: 100%;
                margin: 8px 0;
            }
            
            .logo {
                height: 70px;
            }
            
            .score-display {
                font-size: 65px;
            }
        }