/* Import a nice font */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600&display=swap');

:root {
    --correct-color: #2ecc71;
    --incorrect-color: #e74c3c;
}

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

body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: #fff;
    padding: 20px;
}

.quiz-container {
    width: 100%;
    max-width: 500px;
    padding: 40px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    text-align: center;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

h1, h2 { font-weight: 600; }
h1 { margin-bottom: 10px; }

#progress-counter, .setup-description { margin-bottom: 30px; font-weight: 300; opacity: 0.8; }
#question-prompt { font-size: 1.2rem; margin-bottom: 10px; font-weight: 300; }
#question-element { font-size: 3rem; margin-bottom: 30px; min-height: 60px; }

.input-group { display: flex; gap: 10px; }
#answer-input { flex-grow: 1; }
#answer-input, .range-selector select, .form-group select { padding: 15px; font-size: 1rem; border-radius: 8px; border: 1px solid rgba(255, 255, 255, 0.5); background: rgba(255, 255, 255, 0.2); color: #fff; outline: none; transition: all 0.2s ease; font-family: 'Poppins', sans-serif; }
#answer-input::placeholder { color: rgba(255, 255, 255, 0.6); }
#answer-input:focus, .range-selector select:focus, .form-group select:focus { background: rgba(255, 255, 255, 0.3); border-color: rgba(255, 255, 255, 0.8); }
#answer-input:disabled { opacity: 0.6; cursor: not-allowed; }

.form-group { margin-bottom: 30px; text-align: left; }
.form-group label, .range-selector label { margin-bottom: 5px; font-size: 0.9rem; opacity: 0.8; display: block; }
.form-group select { width: 100%; }
.form-group select option, .range-selector select option { background: #6a5acd; color: #fff; }
.range-selector { display: flex; gap: 15px; }
.range-selector > div { flex: 1; display: flex; flex-direction: column; text-align: left; }
#range-selector-wrapper { transition: opacity 0.3s ease; }
#range-selector-wrapper.disabled { opacity: 0.4; pointer-events: none; }

.quiz-mode-selector { border: 1px solid rgba(255, 255, 255, 0.3); border-radius: 8px; padding: 15px; margin-bottom: 30px; text-align: left; }
.quiz-mode-selector legend { padding: 0 10px; margin-left: 10px; font-weight: 400; opacity: 0.9; }
.quiz-mode-options { display: flex; justify-content: space-around; padding-top: 10px; }
.quiz-mode-options label { display: flex; align-items: center; cursor: pointer; font-size: 0.95rem; }
.quiz-mode-options input[type="radio"] { appearance: none; -webkit-appearance: none; margin-right: 8px; }
.quiz-mode-options input[type="radio"]::before { content: ''; display: block; width: 18px; height: 18px; border-radius: 50%; border: 2px solid rgba(255, 255, 255, 0.5); background-color: rgba(255, 255, 255, 0.2); transition: all 0.2s ease; }
.quiz-mode-options input[type="radio"]:checked::before { background-color: #fff; border-color: #fff; box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.5); }

button { padding: 15px 25px; font-size: 1rem; font-weight: 600; border: none; border-radius: 8px; background: #fff; color: #667eea; cursor: pointer; transition: all 0.2s ease; width: 100%; }
.input-group button { width: auto; }
button:hover { background: #f0f0f0; transform: translateY(-2px); }
button:disabled { opacity: 0.5; cursor: not-allowed; transform: translateY(0); }

#hint-button { background: transparent; border: 1px solid rgba(255, 255, 255, 0.6); color: #fff; width: auto; padding: 15px; }
#hint-button:hover:not(:disabled) { background: rgba(255, 255, 255, 0.2); }

#feedback-message { min-height: 40px; display: flex; justify-content: center; align-items: center; margin-top: 20px; font-weight: 600; }
.correct, .incorrect { background-color: rgba(0, 0, 0, 0.6); padding: 5px 15px; border-radius: 8px; animation: fadeIn 0.3s; }
.correct { color: var(--correct-color); }
.incorrect { color: var(--incorrect-color); }
.hint-message { font-size: 0.9rem; opacity: 0.8; font-weight: 400; }
#continue-prompt { display: none; margin-top: 15px; font-size: 0.9rem; opacity: 0.7; animation: fadeIn 0.5s; }
#quiz-box, #completion-screen { display: none; }
#completion-screen { flex-direction: column; align-items: center; justify-content: center; }
#completion-screen h2 { font-size: 2.5rem; margin-bottom: 20px; }
#final-score { font-size: 1.2rem; margin-bottom: 30px; }
#review-section { width: 100%; margin-top: 20px; text-align: left; }
#review-section h3 { text-align: center; margin-bottom: 15px; font-weight: 400; }
#wrong-answers-list { list-style-type: none; max-height: 150px; overflow-y: auto; background: rgba(0,0,0,0.2); padding: 15px; border-radius: 8px; }
#wrong-answers-list li { padding: 5px 0; border-bottom: 1px solid rgba(255,255,255,0.2); }
#wrong-answers-list li:last-child { border-bottom: none; }
@keyframes fadeIn { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }