:root {
    --primary-color: #4c8bf5;
    --primary-dark: #2c5aa0;
    --secondary-color: #f8f9fa;
    --text-color: #333;
    --border-color: #ddd;
    --success-color: #28a745;
    --error-color: #dc3545;
    --warning-color: #ffc107;
    --bg-color: #fff;
    --panel-bg: #f5f5f5;
    --input-bg: #fff;
}

.dark-theme {
    --primary-color: #5c9aff;
    --primary-dark: #4c8bf5;
    --secondary-color: #292d3e;
    --text-color: #e0e0e0;
    --border-color: #4a4a4a;
    --success-color: #4caf50;
    --error-color: #f44336;
    --warning-color: #ffeb3b;
    --bg-color: #1e1e2e;
    --panel-bg: #292d3e;
    --input-bg: #383a59;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 2px solid var(--primary-color);
    margin-bottom: 30px;
}

header h1 {
    color: var(--primary-color);
    font-size: 28px;
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle button {
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 8px 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.theme-toggle button:hover {
    background-color: var(--primary-color);
    color: white;
}

#theme-toggle-btn {
    display: flex;
    align-items: center;
}

#theme-toggle-btn::before {
    content: "🌓";
    margin-right: 8px;
    font-size: 14px;
}

#screenshot-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    font-weight: bold;
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
}

#screenshot-btn::before {
    content: "📸";
    opacity: 0;
    transition: opacity 0.3s, transform 0.3s;
    position: absolute;
    left: 10px;
    transform: translateX(-20px);
}

#screenshot-btn:hover {
    background-color: var(--primary-dark);
    color: white;
    padding-left: 35px;
}

#screenshot-btn:hover::before {
    opacity: 1;
    transform: translateX(0);
}

#screenshot-btn:active {
    transform: scale(0.95);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.quiz-container {
    background-color: var(--bg-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-bottom: 20px;
}

.quiz-header {
    padding: 20px;
    background-color: var(--primary-color);
    color: white;
    position: relative;
}

.progress-container {
    height: 6px;
    background-color: rgba(255, 255, 255, 0.3);
    margin-top: 10px;
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: white;
    width: 0%;
    transition: width 0.3s ease;
}

#question-number {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 14px;
    font-weight: bold;
}

.quiz-content {
    padding: 20px;
}

.prompt-box {
    background-color: var(--panel-bg);
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-color);
}

.question-image-container {
    margin-top: 15px;
    text-align: center;
}

.question-image-container img {
    max-width: 100%;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.regex-input {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 5px 10px;
}

.regex-input label {
    font-size: 20px;
    color: var(--primary-color);
    margin: 0 5px;
}

.regex-input input {
    flex: 1;
    background-color: transparent;
    border: none;
    padding: 10px;
    font-size: 16px;
    color: var(--text-color);
    font-family: monospace;
}

.regex-input input:focus {
    outline: none;
}

.flags {
    display: flex;
    gap: 10px;
    margin-left: 10px;
}

.flags label {
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 3px;
}

.test-panel, .validation-panel {
    background-color: var(--panel-bg);
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    overflow: auto;
    max-height: 200px;
}

.multiple-choice-options {
    margin-top: 15px;
}

.option {
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 4px;
    background-color: var(--input-bg);
    cursor: pointer;
    transition: background-color 0.2s;
}

.option:hover {
    background-color: var(--border-color);
}

.option input[type="radio"] {
    margin-right: 10px;
}

.option label {
    cursor: pointer;
    font-weight: normal;
}

.code-block {
    white-space: pre-wrap;
    font-family: monospace;
    color: var(--text-color);
}

.button-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

#prev-btn {
    background-color: var(--secondary-color);
    color: var(--text-color);
}

#prev-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    opacity: 0.7;
}

#show-solution-btn {
    background-color: var(--warning-color);
    color: #333;
}

#skip-btn {
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: 1px dashed var(--border-color);
}

#skip-btn:hover {
    background-color: var(--panel-bg);
    color: var(--text-color);
    border-color: var(--primary-color);
}

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

#next-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
}

.reset-container {
    text-align: center;
    margin-bottom: 20px;
}

#reset-btn {
    background-color: var(--error-color);
    color: white;
    padding: 8px 16px;
    font-size: 14px;
}

.solution-box {
    background-color: var(--panel-bg);
    padding: 15px;
    border-radius: 4px;
    margin-top: 20px;
    border-left: 4px solid var(--success-color);
}

.solution-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.solution-header h3 {
    margin: 0;
}

.solution-buttons {
    display: flex;
    gap: 8px;
}

.copy-solution-btn, .copy-solution-only-btn, .apply-solution-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
}

.copy-solution-only-btn {
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.apply-solution-btn {
    background-color: var(--success-color);
    color: white;
}

.copy-solution-btn:hover, .copy-solution-only-btn:hover, .apply-solution-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
    color: white;
}

.apply-solution-btn:hover {
    background-color: var(--success-color);
    filter: brightness(1.1);
}

.copy-solution-btn:active, .copy-solution-only-btn:active, .apply-solution-btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.copy-solution-btn.copied, .copy-solution-only-btn.copied, .apply-solution-btn.applied {
    background-color: var(--success-color);
    color: white;
}

.copy-icon {
    font-size: 14px;
}

.hidden {
    display: none;
}

.match {
    background-color: rgba(40, 167, 69, 0.2);
    border-bottom: 2px solid var(--success-color);
}

.no-match {
    background-color: rgba(220, 53, 69, 0.1);
    border-bottom: 2px solid var(--error-color);
}

footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-color);
    opacity: 0.7;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .theme-toggle {
        margin-left: 0;
        margin-top: 10px;
    }
    
    .button-group {
        flex-direction: column;
    }
}

/* Logo styles */
.logo-container {
    text-align: center;
    margin-bottom: 15px;
}

.logo {
    max-width: 250px;
    height: auto;
}

/* Add this after the .test-panel, .validation-panel block in the CSS file */
.test-strings-container {
    position: relative;
    display: flex;
    flex-direction: column;
}

.copy-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px 10px;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    opacity: 0.7;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    opacity: 1;
    background-color: var(--primary-dark);
}

.copy-btn.copied {
    background-color: var(--success-color);
}

.copy-btn .copy-icon {
    font-size: 14px;
}

/* Ensure test-strings takes full width with space for the button */
#test-strings {
    width: 100%;
    padding-right: 70px; /* Space for the button */
}