/* CSS Variables for Themes */
:root {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --focal-color: #ff0000;
    --control-bg: #2a2a2a;
    --control-border: #3a3a3a;
    --btn-primary: #4a90e2;
    --btn-primary-hover: #357abd;
    --btn-secondary: #666;
    --btn-secondary-hover: #777;
}

/* Theme Variations */
body.theme-light {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --control-bg: #f5f5f5;
    --control-border: #ddd;
}

body.theme-sepia {
    --bg-color: #f5e6d3;
    --text-color: #3d2817;
    --control-bg: #ede0ca;
    --control-border: #d4c4a8;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* View Management */
.view {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.view.hidden {
    display: none;
}

/* Input View Styles */
.container {
    max-width: 800px;
    width: 100%;
    padding: 2rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.instructions {
    text-align: center;
    margin-bottom: 2rem;
    opacity: 0.8;
}

#textInput {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    font-size: 1rem;
    font-family: inherit;
    background-color: var(--control-bg);
    color: var(--text-color);
    border: 2px solid var(--control-border);
    border-radius: 8px;
    resize: vertical;
    margin-bottom: 1rem;
    transition: border-color 0.3s ease;
}

#textInput:focus {
    outline: none;
    border-color: var(--btn-primary);
}

#textInput::placeholder {
    color: var(--text-color);
    opacity: 0.5;
}

.input-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.word-count {
    margin-left: auto;
    font-weight: 500;
    opacity: 0.7;
}

/* Configuration Panel */
.config-panel {
    background-color: var(--control-bg);
    border: 1px solid var(--control-border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.config-panel h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.control-group {
    margin-bottom: 1.5rem;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

#speedSlider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--control-border);
    border-radius: 3px;
    outline: none;
}

#speedSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--btn-primary);
    border-radius: 50%;
    cursor: pointer;
}

#speedSlider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--btn-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

select {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    font-family: inherit;
    background-color: var(--control-bg);
    color: var(--text-color);
    border: 2px solid var(--control-border);
    border-radius: 6px;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

select:focus {
    outline: none;
    border-color: var(--btn-primary);
}

select option {
    background-color: var(--control-bg);
    color: var(--text-color);
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

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

.btn-primary:hover {
    background-color: var(--btn-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

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

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

/* Reading View Styles */
#readingView {
    position: relative;
    overflow: hidden;
}

.reading-container {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.word-display {
    font-size: 4rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    white-space: nowrap;
    position: absolute;
    left: 0;
    user-select: none;
}

.focal-letter {
    color: var(--focal-color);
}

/* Reading Controls */
.reading-controls {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
    align-items: center;
    background-color: var(--control-bg);
    padding: 1rem 1.5rem;
    border-radius: 50px;
    border: 1px solid var(--control-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.btn-control {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--btn-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    padding: 0;
}

.btn-control:hover {
    background-color: var(--btn-primary-hover);
    transform: scale(1.1);
}

.play-icon,
.pause-icon {
    display: block;
}

.progress-info {
    font-weight: 500;
    min-width: 100px;
    text-align: center;
}

/* Quiz Setup Styles */
#apiKeyInput {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    font-family: monospace;
    background-color: var(--control-bg);
    color: var(--text-color);
    border: 2px solid var(--control-border);
    border-radius: 6px;
    transition: border-color 0.3s ease;
}

#apiKeyInput:focus {
    outline: none;
    border-color: var(--btn-primary);
}

.status-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 6px;
    text-align: center;
    font-weight: 500;
}

.status-message.loading {
    background-color: var(--btn-primary);
    color: white;
}

.status-message.error {
    background-color: #e74c3c;
    color: white;
}

.status-message.success {
    background-color: #27ae60;
    color: white;
}

/* Quiz View Styles */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.quiz-header h2 {
    margin: 0;
}

.quiz-progress {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    font-weight: 500;
}

#quizScore {
    color: var(--btn-primary);
}

.question-container {
    background-color: var(--control-bg);
    border: 1px solid var(--control-border);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.question-text {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.option {
    background-color: var(--bg-color);
    border: 2px solid var(--control-border);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.option:hover {
    border-color: var(--btn-primary);
    transform: translateX(4px);
}

.option.selected {
    border-color: var(--btn-primary);
    background-color: var(--control-bg);
}

.option.disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.option.correct {
    border-color: #27ae60;
    background-color: rgba(39, 174, 96, 0.1);
}

.option.incorrect {
    border-color: #e74c3c;
    background-color: rgba(231, 76, 60, 0.1);
}

.option-label {
    font-weight: 600;
    margin-right: 0.5rem;
}

.feedback-container {
    background-color: var(--control-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.feedback-container.correct {
    border-left: 4px solid #27ae60;
}

.feedback-container.incorrect {
    border-left: 4px solid #e74c3c;
}

.feedback-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feedback-title.correct {
    color: #27ae60;
}

.feedback-title.incorrect {
    color: #e74c3c;
}

.feedback-text {
    line-height: 1.6;
    opacity: 0.9;
}

.quiz-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Quiz Results Styles */
.results-summary {
    text-align: center;
    margin: 3rem 0;
}

.score-display {
    display: inline-block;
}

.score-circle {
    width: 200px;
    height: 200px;
    border: 8px solid var(--btn-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 700;
    margin: 0 auto 1rem;
    position: relative;
}

.score-divider {
    font-size: 2rem;
    margin: 0 0.5rem;
    opacity: 0.5;
}

.score-percentage {
    font-size: 2rem;
    font-weight: 600;
    color: var(--btn-primary);
}

.results-details {
    background-color: var(--control-bg);
    border: 1px solid var(--control-border);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.result-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--control-border);
}

.result-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.result-question {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.result-answer {
    margin-bottom: 0.5rem;
    padding-left: 1rem;
}

.result-answer.correct {
    color: #27ae60;
}

.result-answer.incorrect {
    color: #e74c3c;
}

.result-explanation {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--bg-color);
    border-radius: 6px;
    line-height: 1.6;
    opacity: 0.9;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .word-display {
        font-size: 2.5rem;
    }

    #textInput {
        min-height: 200px;
    }

    .input-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .word-count {
        margin-left: 0;
        text-align: center;
    }

    .reading-controls {
        bottom: 1rem;
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }

    .btn-control {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .progress-info {
        min-width: 80px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .word-display {
        font-size: 2rem;
    }

    .config-panel {
        padding: 1rem;
    }

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

    .quiz-progress {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }

    .question-container {
        padding: 1rem;
    }

    .question-text {
        font-size: 1.2rem;
    }

    .score-circle {
        width: 150px;
        height: 150px;
        font-size: 2rem;
    }

    .score-percentage {
        font-size: 1.5rem;
    }
}