:root {
    --primary-color: #3a7bd5;
    --primary-gradient: linear-gradient(135deg, #3a7bd5, #00d2ff);
    --secondary-color: #2c3e50;
    --accent-color: #00d2ff;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --border-radius: 8px;
    --shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f0f2f5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: var(--primary-gradient);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: var(--shadow);
}

header h1 {
    margin: 0;
    font-size: 2.2rem;
    letter-spacing: 1px;
}

header .subtitle {
    opacity: 0.8;
    margin-top: 0.5rem;
    font-size: 1.1rem;
}

.container {
    display: flex;
    flex: 1;
    padding: 1rem;
    gap: 1.5rem;
    max-width: 1800px;
    margin: 0 auto;
}

aside.control-panel {
    flex: 0 0 350px;
    position: sticky;
    top: 1rem;
    align-self: flex-start;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

section {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

section:hover {
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

h2 {
    padding: 1rem;
    margin: 0;
    color: var(--secondary-color);
    font-size: 1.3rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

h2 i {
    color: var(--primary-color);
}

#input-section, #stats-section {
    margin-bottom: 1.5rem;
}

.input-group {
    padding: 1rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.input-group:last-child {
    border-bottom: none;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--secondary-color);
}

input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: var(--transition);
}

input[type="text"]:focus,
input[type="number"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(58, 123, 213, 0.2);
    outline: none;
}

.operations-checkboxes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
}

.operations-checkboxes label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: normal;
    cursor: pointer;
}

.operations-checkboxes i {
    color: var(--primary-color);
    width: 16px;
    text-align: center;
}

.algorithm-params {
    padding: 0.5rem 0;
}

.param-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.8rem;
}

.param-row label {
    flex: 0 0 120px;
    margin-bottom: 0;
}

.param-row input[type="range"] {
    flex: 1;
}

#mutation-rate-value {
    flex: 0 0 40px;
    text-align: right;
}

button {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
    width: 100%;
    margin-top: 1rem;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

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

#stop-button {
    background: var(--danger-color);
    margin-top: 0.5rem;
}

#algorithm-stats {
    padding: 1rem;
}

#algorithm-stats p {
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
}

#algorithm-stats span {
    font-weight: 500;
    color: var(--primary-color);
}

#progress-container {
    padding: 0 1rem 1rem;
}

#evolution-progress {
    height: 10px;
    background-color: #eee;
    border-radius: 5px;
    margin: 0.5rem 0;
    overflow: hidden;
}

#progress-bar {
    height: 100%;
    width: 0;
    background: var(--primary-gradient);
    border-radius: 5px;
    transition: width 0.3s;
}

#progress-percent {
    font-size: 0.9rem;
    color: var(--primary-color);
}

#solution-container {
    padding: 1.5rem;
    min-height: 100px;
}

#visualization-container {
    padding: 1.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    min-height: 100px;
}

.visual-box {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.visual-box:hover {
    transform: scale(1.1);
}

.operation-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary-color);
    margin: 0 0.5rem;
}

.result-box {
    background: var(--success-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-weight: bold;
    font-size: 1.2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.generation-controls {
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.generation-controls button {
    width: auto;
    margin: 0;
    padding: 0.5rem;
    border-radius: 50%;
    width: 36px;
    height: 36px;
}

#current-gen-display {
    font-weight: 500;
    min-width: 120px;
    text-align: center;
}

#generation-grid {
    padding: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    min-height: 300px;
    position: relative;
}

.empty-message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #aaa;
    text-align: center;
    font-style: italic;
}

.individual-card {
    border: 1px solid #eee;
    border-radius: var(--border-radius);
    padding: 0.8rem;
    transition: var(--transition);
    position: relative;
}

.individual-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.individual-card.best {
    border: 2px solid var(--success-color);
}

.individual-fitness {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background-color: var(--secondary-color);
    color: white;
    font-size: 0.8rem;
    padding: 0.2rem 0.5rem;
    border-radius: 10px;
}

.individual-expression {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    word-break: break-word;
}

.individual-value {
    font-weight: bold;
    color: var(--primary-color);
}

.individual-visualization {
    margin-top: 0.8rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    align-items: center;
}

.individual-visualization .visual-box {
    width: 24px;
    height: 24px;
    font-size: 0.8rem;
}

#evolution-chart-container {
    padding: 1rem;
    height: 200px;
}

#evolution-best-solutions {
    padding: 1rem;
    display: flex;
    overflow-x: auto;
    gap: 1rem;
}

.solution-card {
    flex: 0 0 200px;
    border: 1px solid #eee;
    border-radius: var(--border-radius);
    padding: 0.8rem;
    transition: var(--transition);
}

.solution-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.solution-gen {
    font-size: 0.8rem;
    color: #777;
    margin-bottom: 0.3rem;
}

.solution-expression {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    word-break: break-word;
}

.solution-fitness {
    font-size: 0.8rem;
    color: var(--primary-color);
}

footer {
    text-align: center;
    padding: 1.5rem;
    margin-top: 1rem;
    background-color: var(--secondary-color);
    color: white;
}

@media (max-width: 1200px) {
    .container {
        flex-direction: column;
    }
    
    aside.control-panel {
        flex: 0 0 auto;
        position: static;
        width: 100%;
    }
}

@media (max-width: 768px) {
    .operations-checkboxes {
        grid-template-columns: 1fr;
    }
}