:root {
    /* Color Palette */
    --color-primary: #9c27b0; /* Violeta/Fucsia - Energía Reactiva */
    --color-primary-light: #d05ce3;
    --color-primary-dark: #6a0080;
    --color-secondary: #2196f3; /* Azul Cyber - Tecnología */
    --color-secondary-light: #6ec6ff;
    --color-secondary-dark: #0069c0;
    --color-dark: #121212; /* Negro Elegante - Fondo */
    --color-dark-light: #1e1e1e;
    --color-success: #4caf50; /* Verde Luz - Confirmaciones */
    --color-text-secondary: #e0e0e0; /* Blanco Opaco - Textos secundarios */
    --color-text-primary: #ffffff;
    --color-background: #0a0a0a;
    --color-card-bg: #1a1a1a;
    --color-border: #333333;
    --color-accent: #00bcd4; /* Cyan */
    --color-surface: #1e1e1e; /* Superficies sobre el fondo */
    /* Typography */
    --font-primary: 'Roboto', sans-serif;
    --font-secondary: 'Orbitron', sans-serif;
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    /* Animation */
    --transition-speed: 0.3s;
}

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

html {
    font-size: 62.5%; /* 10px = 1rem base */
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 1.6rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    overflow-x: hidden;
    margin: 0;
    padding: 0;
}

/* Header */
.nav-header {
    background-color: #0a0a0a;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #333;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.logo {
    font-family: var(--font-secondary);
    font-size: 2.4rem;
    font-weight: 900;
    letter-spacing: 2px;
}

.world {
    color: var(--color-text-primary);
}

.reactive {
    background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.back-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    font-size: 16px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
}

.back-button:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: scale(0);
    transition: transform 0.5s ease;
}

.back-button:hover {
    transform: scale(1.1) rotate(-5deg);
    box-shadow: 0 5px 15px rgba(156, 39, 176, 0.4);
}

.back-button:hover:before {
    transform: scale(1.5);
    opacity: 0;
}

.back-button i {
    position: relative;
    z-index: 2;
}

/* Container y Pilldora */
.pildora {
    max-width: 800px;
    margin: 9rem auto 3rem;
    background-color: var(--color-card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.pildora::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 70% 30%, rgba(156, 39, 176, 0.08), transparent 70%),
                radial-gradient(circle at 30% 70%, rgba(33, 150, 243, 0.08), transparent 70%);
    z-index: 0;
}

.pildora-title {
    font-family: var(--font-secondary);
    font-size: 3.6rem;
    margin-bottom: var(--spacing-sm);
    position: relative;
    text-align: center;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
    color: var(--color-text-primary);
}

.pildora-title .gradient-text {
    background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.pildora-subtitle {
    font-family: var(--font-secondary);
    font-size: 2rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.pildora-content {
    position: relative;
    z-index: 1;
}

/* Escenas */
.escena {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    padding: var(--spacing-md);
}

.escena:last-child {
    border-bottom: none;
}

.escena h2 {
    font-family: var(--font-secondary);
    font-size: 2.4rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    letter-spacing: 0.05em;
}

.escena h2 .gradient-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.escena-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.escena-row.reverse {
    flex-direction: row-reverse;
}

.escena-text {
    flex: 2;
}

.escena-img-placeholder {
    flex: 1;
    min-width: 200px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    background: #232323;
    /* Alto flexible para escritorio */
    height: 220px;
    max-height: 40vw;
    aspect-ratio: 4 / 3; /* Mantiene relación 4:3 en navegadores modernos */
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.escena-img-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.escena-img-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(156, 39, 176, 0.2) 0%, 
        rgba(33, 150, 243, 0.2) 100%);
}

blockquote {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 4px solid var(--color-primary);
    background-color: rgba(156, 39, 176, 0.1);
    font-style: italic;
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

strong {
    color: var(--color-secondary-light);
    font-weight: 700;
}

/* Nota introductoria */


.intro-note {
    background: var(--color-dark-light);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    position: relative;
    border-left: 4px solid var(--color-secondary);
}

.intro-note::before {
    content: '\f0eb'; /* Fontawesome lightbulb */
    font-family: 'Font Awesome 5 Free', 'FontAwesome', sans-serif;
    font-weight: 900;
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 2.4rem;
    color: var(--color-secondary);
    opacity: 0.3;
}

.intro-note h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-secondary);
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--color-text-secondary);
    background: var(--color-dark-light);
    margin-top: var(--spacing-lg);
    font-size: 1.4rem;
}

/* Animaciones */
@keyframes glow {
    0% {
        box-shadow: 0 0 5px rgba(156, 39, 176, 0.3), 0 0 10px rgba(33, 150, 243, 0.3);
    }
    50% {
        box-shadow: 0 0 15px rgba(156, 39, 176, 0.6), 0 0 20px rgba(33, 150, 243, 0.6);
    }
    100% {
        box-shadow: 0 0 5px rgba(156, 39, 176, 0.3), 0 0 10px rgba(33, 150, 243, 0.3);
    }
}

/* Botones de código y paneles */
.credits-container {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
}

.credit-buttons {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    justify-content: stretch;
    width: 100%;
}

.code-button {
    background: linear-gradient(135deg, var(--color-dark-light), var(--color-card-bg));
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    color: var(--color-text-primary);
    padding: var(--spacing-xs) 10px;
    font-family: var(--font-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
    flex: 1 1 0;
    min-width: 0;
    max-width: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    margin: 0 5px;
}

.code-button .concept-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    transition: color var(--transition-speed) ease;
}

.code-button .concept-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    transition: color var(--transition-speed) ease;
}

.code-button .concept-desc {
    font-size: 1.4rem;
    background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    transition: transform var(--transition-speed) ease;
}

.code-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(156, 39, 176, 0.1) 0%, 
        rgba(33, 150, 243, 0.1) 100%);
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
}

.code-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    border-color: var(--color-primary-light);
}

.code-button:hover::before {
    opacity: 1;
}

.code-button.active {
    background: linear-gradient(135deg, 
        rgba(156, 39, 176, 0.3) 0%, 
        rgba(33, 150, 243, 0.3) 100%);
    border-color: var(--color-primary);
    box-shadow: 0 0 15px rgba(156, 39, 176, 0.4);
    transform: translateY(-3px);
}

.code-button:hover .concept-name {
    color: var(--color-secondary-light);
}

.code-button:hover .concept-desc {
    transform: scale(1.05);
}

.code-examples {
    position: relative;
    min-height: 400px;
    margin-top: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    background-color: var(--color-dark);
    overflow: hidden;
}

.code-panel {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: var(--spacing-md);
    display: none;
    overflow-y: auto;
    border: none;
    box-shadow: none;
    background-color: transparent;
}

.code-panel.active {
    display: block;
}

.code-panel {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: var(--spacing-md);
    display: none;
    overflow-y: auto;
    border: none;
    box-shadow: none;
    background-color: transparent;
}

.code-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
}

/* Panel de código */
.code-panel h3 {
    font-family: var(--font-secondary);
    font-size: 2.4rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.code-panel h3 .gradient-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 400;
    font-size: 2rem;
}

.code-panel pre {
    background-color: #282c34;
    border-radius: var(--border-radius-md);
    padding: 0.8rem 1.1rem;
    overflow-x: auto;
    max-height: 400px;
    margin-bottom: 0.8rem;
    border: 1px solid #3e4451;
}

.code-panel code {
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 1.18rem;
    line-height: 1.35;
}

.code-panel code .hljs-comment, .code-panel code .hljs-quote {
    color: #6a9955 !important; /* Verde tipo IntelliJ para comentarios */
    font-style: italic;
    opacity: 0.95;
}

.code-comment {
    background-color: rgba(156, 39, 176, 0.1);
    border-left: 3px solid var(--color-primary);
    padding: var(--spacing-sm);
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .credit-buttons {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
        width: 100%;
        align-items: center;
        justify-content: center;
        margin-top: 0.5rem;
    }
    .code-button {
        width: 48%;
        min-width: 120px;
        max-width: 48%;
        font-size: 1.15rem;
        padding: 0.7rem 0.5rem;
        margin: 0;
        box-sizing: border-box;
        margin-bottom: 0.3rem;
    }
    .code-button .concept-name {
        font-size: 1.25rem;
    }
    .code-examples {
        min-width: 0;
        width: 100%;
        overflow-x: auto;
    }
    .code-panel pre {
        padding: 0.5rem 0.7rem;
        font-size: 0.98rem;
        margin-bottom: 0.7rem;
        max-width: 100vw;
        overflow-x: auto;
        box-sizing: border-box;
    }

    .escena-row, .escena-row.reverse {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    .escena {
        margin-left: 10px;
        margin-right: 10px;
    }

    .escena-img-placeholder {
        width: 100vw;
        min-width: 0;
        height: 260px;
        max-height: 260px;
        overflow: hidden;
        margin-left: -16px;
        margin-right: -16px;
        border-radius: var(--border-radius-md);
        background: var(--color-card-bg);
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .escena-img-placeholder img {
        width: 100vw;
        max-width: 100vw;
        height: 260px;
        max-height: 260px;
        object-fit: cover;
        display: block;
        margin: 0;
        border-radius: var(--border-radius-md);
        box-shadow: none;
    }

    .pildora {
        margin: 8rem var(--spacing-sm) 3rem;
        padding: var(--spacing-sm);
    }

    .pildora-title {
        font-size: 2.8rem;
    }

    .pildora-subtitle {
        font-size: 1.8rem;
    }

    .escena h2 {
        font-size: 2.2rem;
    }
}

@media (max-width: 480px) {
    .pildora-title {
        font-size: 2.4rem;
    }

    blockquote {
        padding: var(--spacing-sm);
    }
}