/* Reset y configuración base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: #e0e0e0;
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-bottom: 80px; /* Espacio para el footer sticky */
}

/* Header */
header {
    text-align: center;
    margin-bottom: 1.5rem;
}

header h1 {
    font-size: 2.2rem;
    color: #4fc3f7;
    margin-bottom: 0.3rem;
    text-shadow: 0 0 20px rgba(79, 195, 247, 0.3);
}

header h2 {
    font-size: 1.1rem;
    color: #b0bec5;
    font-weight: 300;
}

/* Grid de principios */
.principles-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1rem;
    flex: 1;
    overflow: hidden;
}

.column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.column::-webkit-scrollbar {
    width: 4px;
}

.column::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

.column::-webkit-scrollbar-thumb {
    background: rgba(79, 195, 247, 0.5);
    border-radius: 2px;
}

.column::-webkit-scrollbar-thumb:hover {
    background: rgba(79, 195, 247, 0.7);
}

/* Tarjetas de principios */
.principle-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.15s ease-out;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.principle-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(79, 195, 247, 0.1), transparent);
    transition: left 0.5s ease;
}

.principle-card:hover::before {
    left: 100%;
}

.principle-card:hover {
    border-color: #4fc3f7;
    background: rgba(79, 195, 247, 0.08);
    box-shadow: 0 8px 25px rgba(79, 195, 247, 0.2);
}

.card-number {
    position: absolute;
    top: 0.8rem;
    right: 0.8rem;
    background: linear-gradient(135deg, #4fc3f7, #29b6f6);
    color: #1a1a2e;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
    box-shadow: 0 3px 10px rgba(79, 195, 247, 0.3);
}

.principle-card h3 {
    color: #4fc3f7;
    margin-bottom: 0.5rem;
    font-size: 1rem;
    padding-right: 2.5rem;
    line-height: 1.2;
}

.principle-card p {
    color: #b0bec5;
    font-size: 0.8rem;
    line-height: 1.3;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    margin: 5% auto;
    padding: 2rem;
    border: 1px solid rgba(79, 195, 247, 0.3);
    border-radius: 20px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
}

.close {
    color: #aaa;
    float: right;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    transition: color 0.3s ease;
}

.close:hover {
    color: #4fc3f7;
}

#modal-title {
    color: #4fc3f7;
    margin-bottom: 2rem;
    font-size: 2rem;
    text-align: center;
    padding-right: 2rem;
}

.modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.difficulty-section,
.importance-section {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.difficulty-section h3 {
    color: #ff6b6b;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.importance-section h3 {
    color: #51cf66;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.difficulty-section ul,
.importance-section ul {
    list-style: none;
    padding: 0;
}

.difficulty-section li,
.importance-section li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
    color: #b0bec5;
    line-height: 1.4;
}

.difficulty-section li::before {
    content: '⚠️';
    position: absolute;
    left: 0;
    top: 0;
}

    .importance-section li::before {
        content: '✅';
        position: absolute;
        left: 0;
        top: 0;
    }

/* Footer */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    border-top: 1px solid rgba(79, 195, 247, 0.2);
    padding: 1rem 0;
    backdrop-filter: blur(15px);
    z-index: 100;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.copyright {
    color: #b0bec5;
    font-size: 0.9rem;
    margin: 0;
}

.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #4fc3f7;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid rgba(79, 195, 247, 0.3);
    background: rgba(79, 195, 247, 0.05);
}

.github-link:hover {
    background: rgba(79, 195, 247, 0.1);
    border-color: #4fc3f7;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(79, 195, 247, 0.2);
}

.github-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.github-link:hover .github-icon {
    transform: scale(1.1);
}

/* Responsive */
@media (max-width: 768px) {
    .principles-grid {
        display: flex;
        flex-direction: column;
        gap: 0.8rem;
        overflow: visible;
    }
    
    .left-column,
    .right-column {
        display: contents;
    }
    
    .column {
        gap: 0.8rem;
    }
    
    .principle-card {
        padding: 1rem;
    }
    
    .modal-body {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .modal-content {
        margin: 10% auto;
        padding: 1.5rem;
        width: 95%;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .github-link {
        justify-content: center;
    }
    
    .footer {
        padding: 0.8rem 0;
    }
    
    .container {
        padding-bottom: 120px; /* Más espacio en móvil para ver la última tarjeta */
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
        padding-bottom: 120px; /* Asegurar espacio en pantallas muy pequeñas */
    }
    
    .principle-card {
        padding: 1rem;
    }
    
    .card-number {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
    
    .principle-card h3 {
        font-size: 1.1rem;
    }
    
    .principle-card p {
        font-size: 0.9rem;
    }
}