:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --background-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #2b2d42;
    --text-light: #8d99ae;
    --border-radius: 12px;
    --box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
}

/* Estilos para el footer */
.footer-card:hover {
    transform: scale(1.02);
}

.social-link:hover {
    transform: scale(1.2) rotate(5deg);
    color: var(--secondary-color);
}

@keyframes pulseTitle {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.footer-title {
    animation: pulseTitle 2s infinite;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

.app-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    margin-bottom: 30px;
}

.app-section {
    padding: 25px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.section-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.section-title::before {
    content: '';
    display: inline-block;
    width: 5px;
    height: 24px;
    background-color: var(--primary-color);
    margin-right: 10px;
    border-radius: 3px;
}

.input-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

button {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 14px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    margin-top: 10px;
}

button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(67, 97, 238, 0.3);
}

.examples {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.example-btn {
    background-color: #e9ecef;
    color: var(--text-color);
    border: none;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    margin: 5px 0;
    width: auto;
}

.example-btn:hover {
    background-color: #dee2e6;
    transform: translateY(0);
    box-shadow: none;
}

.result-section {
    background-color: rgba(76, 201, 240, 0.1);
}

.array-display {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 20px 0;
    justify-content: center;
}

.array-item {
    width: 55px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    color: white;
    border-radius: 10px;
    position: relative;
    transition: var(--transition);
    font-weight: bold;
    font-size: 1.2rem;
}

.array-item .index {
    position: absolute;
    top: -25px;
    background-color: #e9ecef;
    color: var(--text-color);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: normal;
}

.array-item.selected {
    background-color: var(--danger-color);
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(247, 37, 133, 0.3);
}

.array-item.processed {
    background-color: var(--text-light);
}

.steps {
    margin-top: 20px;
    padding: 0;
    list-style: none;
    max-height: 350px;
    overflow-y: auto;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.steps li {
    padding: 12px 15px;
    margin-bottom: 1px;
    background-color: #f8f9fa;
    border-left: 4px solid var(--primary-color);
}

.steps li.highlight {
    background-color: rgba(76, 201, 240, 0.1);
    border-left-color: var(--success-color);
    font-weight: 600;
}

.steps li.solution {
    background-color: rgba(247, 37, 133, 0.1);
    border-left-color: var(--danger-color);
    font-weight: 600;
}

.complexity {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
}

.complexity-card {
    text-align: center;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    width: 45%;
}

.complexity-title {
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.complexity-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.result-message {
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    margin: 15px 0;
}

.animation-control {
    display: flex;
    justify-content: center;
    margin-top: 20px;
    gap: 10px;
}

.control-btn {
    background-color: #e9ecef;
    color: var(--text-color);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    width: auto;
}

.control-btn:hover {
    background-color: #dee2e6;
}

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

.control-btn.primary:hover {
    opacity: 0.9;
}

/* Animación de entrada */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.app-card {
    animation: fadeIn 0.5s ease forwards;
}

/* Footer styles */
.footer {
    margin-top: 60px;
    text-align: center;
    padding-bottom: 30px;
}

.footer-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--box-shadow);
    max-width: 900px;
    margin: 0 auto;
    transition: transform 0.3s ease;
}

.footer-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 16px;
}

.social-link {
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.copyright {
    margin-top: 16px;
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Efectos de respuesta */
@media (max-width: 768px) {
    .complexity {
        flex-direction: column;
        gap: 15px;
    }
    
    .complexity-card {
        width: 100%;
    }
    
    .array-item {
        width: 45px;
        height: 45px;
        font-size: 1rem;
    }
    
    .container {
        padding: 20px 10px;
    }
    
    h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .animation-control {
        flex-direction: column;
    }
    
    .control-btn {
        width: 100%;
    }
}