:root {
    --color-primary: #2c3e50;
    --color-secondary: #3498db;
    --color-success: #2ecc71;
    --color-danger: #e74c3c;
    --color-warning: #f39c12;
    --color-ai: #9b59b6;
    --color-light: #ecf0f1;
    --color-dark: #2c3e50;
    --color-bg: #f5f5f5;
    --color-card: #ffffff;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    background-color: var(--color-bg);
    color: var(--color-primary);
}

@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.connection-status {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    z-index: 100;
}

.status-checking { background-color: var(--color-warning); box-shadow: 0 0 10px var(--color-warning); }
.status-connected { background-color: var(--color-success); box-shadow: 0 0 10px var(--color-success); }
.status-disconnected { background-color: var(--color-danger); box-shadow: 0 0 10px var(--color-danger); }

.practice-container {
    width: 100%;
    margin: 4rem 0;
    padding: 0 2rem;
    box-sizing: border-box;
}

.split-container {
    display: flex;
    gap: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    min-height: 400px;
}

.question-side {
    flex: 1;
    padding: 2rem;
    border-right: 1px solid #e9ecef;
}

.answer-side {
    flex: 1;
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.question-content {
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.answer-content {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.main-header {
    padding: 2rem 0;
    text-align: center;
}

.hero-section {
    margin: 4rem 0;
}

.hero-section h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.subhead {
    font-size: 1.5rem;
    color: #666;
}

/* Navigation Styles */
.main-nav {
    background-color: var(--color-primary);
    padding: 2rem 1rem;
    margin: 0;
    width: 100%;
}

.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.main-nav a {
    color: white;
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 4px;
    transition: all 0.3s;
    font-size: 1.1em;
    font-weight: bold;
}

.main-nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.main-nav a.active {
    background-color: var(--color-secondary);
}

/* Practice Groups */
.practice-groups {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin: 4rem 0;
}

.group-row {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.group-card {
    background: var(--color-card);
    border-radius: 15px;
    padding: 2rem;
    width: 45%;
    text-decoration: none;
    color: var(--color-primary);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #e9ecef;
}

.group-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    background: var(--color-card);
}

.group-card h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.group-card p {
    color: #666;
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .group-row {
        flex-direction: column;
    }
    
    .group-card {
        width: 100%;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-section h1 {
        font-size: 2.5rem;
    }
}

.level-boxes {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.box {
    background: white;
    border-radius: 10px;
    padding: 1.5rem;
    min-width: 200px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 3px solid transparent;
    flex: 1;
    max-width: 250px;
    text-align: center;
}

.box:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.box.active {
    border-color: var(--color-secondary);
    background-color: var(--color-primary);
    color: white;
}

.box.active h2 {
    color: white;
}

.box[data-level="ai"] {
    border-color: var(--color-ai);
}

.box[data-level="ai"].active {
    background-color: var(--color-ai);
}

.box h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.box p {
    color: #7f8c8d;
    margin: 0;
}

.box.active p {
    color: rgba(255,255,255,0.8);
}

#question-text {
    font-size: 2em;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 2rem;
    padding: 1rem;
    text-align: center;
}

.question-info {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 1.5rem;
    font-family: 'Courier New', monospace;
    line-height: 1.8;
    border: 1px solid #e9ecef;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.question-info p {
    margin: 0;
    padding: 0.5rem;
    border-bottom: 1px solid #e9ecef;
}

.question-info p:last-child {
    border-bottom: none;
}

.question-info p strong {
    color: var(--color-primary);
    font-weight: 600;
    margin-right: 1rem;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
    font-size: 1.1em;
}

.option {
    padding: 1rem 1.5rem;
    background-color: #f8f9fa;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid #e9ecef;
    display: flex;
    align-items: center;
    user-select: none;
}

.option:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateX(5px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.option.selected {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    transform: translateX(5px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.answer-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: auto;
}

#submit-answer {
    background-color: var(--color-success);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 600;
    transition: all 0.3s ease;
    min-width: 200px;
}

#submit-answer:hover {
    background-color: #27ae60;
    transform: translateY(-2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#submit-answer:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

#feedback {
    margin: 0;
    padding: 1rem 1.5rem;
    border-radius: 6px;
    font-size: 1.1em;
    text-align: center;
    font-weight: 500;
    transition: all 0.3s ease;
}

#feedback.correct {
    background-color: rgba(46, 204, 113, 0.1);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

#feedback.incorrect {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
}

#generate-btn {
    background-color: var(--color-primary);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1em;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 1rem;
}

#generate-btn:hover {
    background-color: #1a252f;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

#generate-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

@media (max-width: 768px) {
    .split-container {
        flex-direction: column;
    }

    .question-side {
        border-right: none;
        border-bottom: 1px solid #e9ecef;
    }

    .practice-container {
        max-width: 100%;
        margin: 1rem auto;
        padding: 0 0.5rem;
    }

    .level-boxes {
        flex-direction: column;
        align-items: center;
    }

    .box {
        width: 100%;
        max-width: 100%;
    }

    .answer-buttons {
        flex-direction: column;
        align-items: center;
    }

    .answer-btn {
        width: 100%;
        max-width: 100%;
    }
}

/* Depreciation Calculator Styles */
.depreciation-calculator {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    margin: 20px auto;
    max-width: 600px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.depreciation-calculator h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    text-align: center;
}

.calculator-inputs {
    display: grid;
    gap: 15px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.input-group label {
    font-weight: 600;
    color: #34495e;
}

.input-group input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.input-group input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

#calculate-depreciation {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    margin-top: 10px;
    transition: background-color 0.2s;
}

#calculate-depreciation:hover {
    background-color: #2980b9;
}

#depreciation-result {
    margin-top: 20px;
    padding: 15px;
    border-radius: 4px;
    background-color: #fff;
    border: 1px solid #ddd;
    min-height: 50px;
}

.answer-input {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    width: 100%;
    max-width: 400px;
}

#answer-input {
    flex: 1;
    padding: 0.8rem 1rem;
    border: 2px solid #e9ecef;
    border-radius: 6px;
    font-size: 1.1em;
    transition: all 0.3s ease;
}

#answer-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

#submit-answer {
    background-color: var(--color-success);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 600;
    transition: all 0.3s ease;
}

#submit-answer:hover {
    background-color: #27ae60;
    transform: translateY(-2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Depreciation Question Styles */
.question-info {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    font-family: 'Courier New', monospace;
    line-height: 1.8;
    border: 1px solid #e9ecef;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.question-info p {
    margin: 0.5rem 0;
    padding: 0.5rem;
    border-bottom: 1px solid #e9ecef;
}

.question-info p:last-child {
    border-bottom: none;
}

.question-info p strong {
    color: var(--color-primary);
    font-weight: 600;
    margin-right: 1rem;
}

.options {
    display: grid;
    gap: 1rem;
    margin: 1.5rem 0;
    font-size: 1.1em;
}

.options p {
    padding: 1rem 1.5rem;
    background-color: #f8f9fa;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid #e9ecef;
    display: flex;
    align-items: center;
}

.options p:hover {
    background-color: #e9ecef;
    transform: translateX(5px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.options p::before {
    content: attr(data-option);
    font-weight: bold;
    margin-right: 1rem;
    color: var(--color-primary);
}

#question-text {
    font-size: 1.3em;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--color-primary);
    line-height: 1.4;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 6px;
    border-left: 4px solid var(--color-primary);
}

#feedback {
    margin-top: 1.5rem;
    padding: 1rem 1.5rem;
    border-radius: 6px;
    font-size: 1.1em;
    text-align: center;
    font-weight: 500;
    transition: all 0.3s ease;
}

#feedback.correct {
    background-color: rgba(46, 204, 113, 0.1);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

#feedback.incorrect {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
}

/* Add these styles after the existing styles */

.answer-buttons {
    display: flex;
    gap: 1rem;
    margin: 2rem 0;
    justify-content: center;
}

.answer-btn {
    flex: 1;
    max-width: 200px;
    padding: 1.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.answer-btn[data-answer="debit"] {
    background-color: var(--color-danger);
    color: white;
}

.answer-btn[data-answer="credit"] {
    background-color: var(--color-success);
    color: white;
}

.answer-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.answer-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.answer-btn.selected {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    opacity: 0.9;
}

.question-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    width: 100%;
    margin: 0;
    text-align: center;
}

#question-text {
    font-size: 2em;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid var(--color-primary);
}

.answer-buttons {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
    justify-content: center;
}

.answer-btn {
    flex: 1;
    max-width: 200px;
    padding: 1.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.answer-btn[data-answer="debit"] {
    background-color: var(--color-danger);
    color: white;
}

.answer-btn[data-answer="credit"] {
    background-color: var(--color-success);
    color: white;
}

.answer-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.answer-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.answer-btn.selected {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    opacity: 0.9;
}

#feedback {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    border-radius: 6px;
    font-size: 1.2em;
    text-align: center;
    font-weight: 500;
    transition: all 0.3s ease;
}

.score {
    font-size: 1.2em;
    color: var(--color-primary);
    font-weight: 500;
    margin-top: 1rem;
}

@media (max-width: 768px) {
    .question-container {
        padding: 1.5rem;
        margin: 0 1rem;
    }

    #question-text {
        font-size: 1.5em;
    }

    .answer-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .answer-btn {
        width: 100%;
        max-width: 100%;
        font-size: 1.3rem;
    }
}

/* Chat Interface Styles */
.chat-container {
    max-width: 95%;
    margin: 2rem auto;
    padding: 1rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.chat-container h3 {
    color: var(--color-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-light);
}

.chat-messages {
    height: 300px;
    overflow-y: auto;
    padding: 1rem;
    background: var(--color-bg);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.chat-message {
    margin-bottom: 1rem;
    padding: 0.8rem;
    border-radius: 8px;
    max-width: 80%;
}

.user-message {
    background-color: var(--color-secondary);
    color: white;
    margin-left: auto;
}

.ai-message {
    background-color: var(--color-light);
    color: var(--color-primary);
    margin-right: auto;
}

.chat-input-container {
    display: flex;
    gap: 1rem;
}

#chat-input {
    flex: 1;
    padding: 0.8rem;
    border: 2px solid var(--color-light);
    border-radius: 8px;
    font-size: 1rem;
}

#chat-input:focus {
    outline: none;
    border-color: var(--color-secondary);
}

#chat-submit {
    padding: 0.8rem 1.5rem;
    background-color: var(--color-secondary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

#chat-submit:hover {
    background-color: var(--color-primary);
}

@media (max-width: 768px) {
    .chat-container {
        margin: 1rem auto;
    }
    
    .chat-messages {
        height: 250px;
    }
    
    .chat-message {
        max-width: 90%;
    }
}

.answer-container {
    margin: 20px 0;
    text-align: center;
}

.show-answer-btn {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

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

.answer-dropdown {
    display: none;
    margin-top: 10px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.answer-dropdown.show {
    display: block;
}

.answer-dropdown p {
    margin: 0;
    font-size: 18px;
    color: #333;
}

/* Remove old input styles */
#answer-input-container,
#submit-answer,
.option {
    display: none;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0 1rem;
}

.method-toggle {
    display: flex;
    gap: 0.5rem;
    background: #f8f9fa;
    padding: 0.5rem;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.method-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
    font-weight: 600;
    color: var(--color-primary);
    transition: all 0.3s ease;
}

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

.method-btn:hover:not(.active) {
    background: rgba(44, 62, 80, 0.1);
}

#generate-btn {
    margin: 0;
}