/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --accent: #6b46c1;
    --accent-light: #8b5cf6;
    --accent-dark: #553c9a;
    --success: #38a169;
    --error: #e53e3e;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.05);
    --shadow-card: rgba(107, 70, 193, 0.1);
    --font-mono: 'Courier New', 'Monaco', 'Menlo', monospace;
    --transition: all 0.2s ease;
}

body {
    font-family: var(--font-mono);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container and layout */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: normal;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.timer {
    font-size: 1.2rem;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-secondary);
    display: inline-block;
}

#time-display {
    color: var(--accent);
    font-weight: bold;
}

/* Sections */
.section {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px var(--shadow);
}

/* Form elements */
.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input[type="number"],
input[type="text"],
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 1rem;
    background: var(--bg-primary);
    transition: var(--transition);
}

input[type="number"]:focus,
input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--shadow-card);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
    text-decoration: none;
    margin: 0.25rem;
}

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

.btn.primary:hover {
    background: var(--accent-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow-card);
}

.btn.secondary {
    background: var(--bg-primary);
    color: var(--accent);
    border: 1px solid var(--border);
}

.btn.secondary:hover {
    background: var(--border);
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Questions */
.question {
    margin-bottom: 1.5rem;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-primary);
    transition: var(--transition);
}

.question:hover {
    border-color: var(--accent);
}

.question-label {
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.question input {
    margin-top: 0.5rem;
}

/* Results */
#score-display {
    font-size: 1.5rem;
    text-align: center;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border-radius: 4px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
}

.score-correct {
    color: var(--success);
}

.score-incorrect {
    color: var(--error);
}

#wrong-answers {
    margin-bottom: 2rem;
}

.wrong-answer {
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid var(--error);
    border-radius: 4px;
    background: rgba(229, 62, 62, 0.05);
}

.wrong-answer-header {
    font-weight: bold;
    color: var(--error);
    margin-bottom: 0.5rem;
}

.answer-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 0.5rem;
}

.your-answer,
.correct-answer {
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.9rem;
}

.your-answer {
    background: rgba(229, 62, 62, 0.1);
    border: 1px solid var(--error);
}

.correct-answer {
    background: rgba(56, 161, 105, 0.1);
    border: 1px solid var(--success);
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 1rem 0.5rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .section {
        padding: 1.5rem;
    }
    
    .answer-comparison {
        grid-template-columns: 1fr;
    }
    
    .btn {
        width: 100%;
        margin: 0.25rem 0;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeIn 0.3s ease;
}

/* Test History */
.no-history {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: 2rem;
}

#history-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.history-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 4px var(--shadow);
    position: relative;
    overflow: hidden;
}

.history-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transition: var(--transition);
}

.history-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px var(--shadow-card);
    border-color: var(--accent);
}

.history-card:hover::before {
    height: 6px;
}

.card-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-questions {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.card-score {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.score-badge {
    background: var(--accent);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: normal;
}

.card-score.perfect {
    color: var(--success);
}

.card-score.perfect .score-badge {
    background: var(--success);
}

/* Historical test details */
#history-details-section h2 {
    color: var(--accent);
    margin-bottom: 1rem;
}

#history-score-display {
    font-size: 1.5rem;
    text-align: center;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border-radius: 4px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
}

/* Responsive history cards */
@media (max-width: 768px) {
    #history-container {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .history-card {
        padding: 1rem;
    }
}

/* Footer */
footer {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 0.5rem 1rem;
    box-shadow: 0 4px 12px var(--shadow-card);
    color: var(--text-secondary);
    font-size: 0.8rem;
    z-index: 1000;
    transition: var(--transition);
}

footer:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--shadow-card);
}

footer a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}

footer a:hover {
    color: var(--accent-light);
}

/* Hidden state */
.hidden {
    display: none !important;
}