:root {
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --accent-color: #FFC107;
    --background-color: #f5f5f5;
    --text-color: #333;
    --error-color: #f44336;
    --success-color: #4CAF50;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

#app {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.screen {
    display: none;
    text-align: center;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.screen.active {
    display: block;
}

h1, h2, h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: #45a049;
}

.btn-secondary {
    background-color: var(--background-color);
    color: var(--text-color);
    border: 2px solid var(--secondary-color);
    padding: 12px 24px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s;
    margin-top: 20px;
}

.btn-secondary:hover {
    background-color: var(--secondary-color);
    color: white;
}

.mode-buttons, .book-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin: 20px 0;
}

.mode-btn, .book-btn {
    padding: 15px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.mode-btn:hover, .book-btn:hover {
    background-color: #1976D2;
}

.timer {
    font-size: 24px;
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.question-container {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.answers {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin: 20px 0;
}

.answer-btn {
    padding: 15px;
    background-color: var(--background-color);
    border: 2px solid var(--secondary-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.answer-btn:hover {
    background-color: var(--secondary-color);
    color: white;
}

.answer-btn.selected {
    background-color: var(--secondary-color);
    color: white;
}

.answer-btn.correct-answer {
    background-color: #4CAF50;
    color: white;
    animation: blink 1s infinite;
}

#result-message {
    font-size: 24px;
    font-weight: bold;
    margin: 20px 0;
}

#result-message.correct {
    color: var(--success-color);
}

#result-message.incorrect {
    color: var(--error-color);
}

#next-question-timer {
    font-size: 36px;
    color: var(--accent-color);
    margin: 20px 0;
}

#ranking-list {
    margin: 20px 0;
}

.ranking-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background-color: var(--background-color);
    margin-bottom: 10px;
    border-radius: 5px;
}

.logo {
    max-width: 150px;
    height: auto;
    margin-bottom: 2rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.logo img {
    max-width: 200px;
    height: auto;
}

@keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

.blink {
    animation: blink 0.5s infinite;
}

.correct-answer {
    font-size: 18px;
    color: var(--secondary-color);
    margin: 10px 0;
    padding: 10px;
    background-color: rgba(33, 150, 243, 0.1);
    border-radius: 5px;
}

.bible-reference {
    margin-top: 20px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 5px;
    text-align: center;
    font-style: italic;
    color: #666;
}

.settings-container {
    max-width: 500px;
    margin: 20px auto;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.setting-item {
    margin-bottom: 20px;
}

.setting-item label {
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
    color: #333;
}

.setting-item input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

.setting-item input[type="number"]:focus {
    border-color: #4CAF50;
    outline: none;
}

.google-icon {
    width: 24px;
    height: 24px;
    margin-right: 10px;
    vertical-align: middle;
}

.user-info {
    margin: 20px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid #4CAF50;
}

#user-name {
    font-size: 18px;
    color: #333;
}

#logout {
    margin-top: 10px;
}

.auth-form {
    max-width: 400px;
    margin: 20px auto;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.auth-form h2 {
    margin-bottom: 20px;
    color: #333;
}

.form-group {
    margin-bottom: 15px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

.form-group input:focus {
    border-color: #4CAF50;
    outline: none;
}

#show-register, #show-login {
    margin-top: 10px;
}

.user-info {
    margin: 20px 0;
    font-size: 18px;
    color: #333;
}

#logout {
    margin-top: 10px;
}

.error-message {
    background-color: #ffebee;
    color: #c62828;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
    text-align: center;
}

.success-message {
    background-color: #e8f5e9;
    color: #2e7d32;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
    text-align: center;
}

.btn-secondary {
    display: inline-block;
    text-decoration: none;
    margin-top: 10px;
}

.feedback-container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.feedback-container.correct {
    border: 4px solid #4CAF50;
    animation: pulse-green 1s infinite;
}

.feedback-container.incorrect {
    border: 4px solid #f44336;
    animation: pulse-red 1s infinite;
}

@keyframes pulse-green {
    0% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(76, 175, 80, 0); }
    100% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }
}

@keyframes pulse-red {
    0% { box-shadow: 0 0 0 0 rgba(244, 67, 54, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(244, 67, 54, 0); }
    100% { box-shadow: 0 0 0 0 rgba(244, 67, 54, 0); }
}

.feedback-container h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #333;
}

.correct-answer {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    margin: 1rem 0;
    font-size: 1.2rem;
}

.biblical-reference {
    font-style: italic;
    color: #666;
    margin: 1rem 0;
    font-size: 1.1rem;
}

.next-question-timer {
    margin-top: 2rem;
    font-size: 1.2rem;
    color: #666;
}

#countdown {
    font-weight: bold;
    color: #333;
}

.answers-feedback {
    margin: 1.5rem 0;
}

.user-answer {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    font-size: 1.2rem;
    font-weight: bold;
}

.user-answer.correct {
    background-color: #e8f5e9;
    color: #2e7d32;
    border: 2px solid #4caf50;
}

.user-answer.incorrect {
    background-color: #ffebee;
    color: #c62828;
    border: 2px solid #f44336;
}

.correct-answer {
    background-color: #e8f5e9;
    color: #2e7d32;
    padding: 1rem;
    border-radius: 5px;
    font-size: 1.2rem;
    font-weight: bold;
    border: 2px solid #4caf50;
}

.biblical-reference {
    font-style: italic;
    color: #666;
    margin: 1rem 0;
    font-size: 1.1rem;
    padding: 1rem;
    background-color: #f5f5f5;
    border-radius: 5px;
    border-left: 4px solid #2196f3;
}

.question-counter {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    padding: 0.5rem;
    background-color: #f5f5f5;
    border-radius: 5px;
    font-weight: bold;
}

.welcome-content {
    text-align: center;
    margin-bottom: 2rem;
}

.welcome-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.welcome-content .logo {
    max-width: 150px;
    height: auto;
    margin-bottom: 2rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.welcome-content img.logo {
    max-width: 100px !important;
    height: 100px !important;
    margin-bottom: 1rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}