/* VARIABLES CSS */
:root {
    --primary-green: #00ff00;
    --secondary-green: #00aa00;
    --dark-green: #003300;
    --light-green: #001100;
    --bg-dark: #1a1a1a;
    --bg-darker: #0f0f0f;
    --text-light: #ccc;
    --text-gray: #888;
    --text-white: #ffffff;
    --border-gray: #333;
    --border-medium: #666;
    
    --glow-large: 0 0 20px var(--primary-green);
    --glow-medium: 0 0 10px var(--primary-green);
    --glow-small: 0 0 5px var(--primary-green);
    --glow-tiny: 0 0 3px var(--primary-green);
}

/* ESTILOS BASE COMUNES */
body {
    font-family: 'Courier New', monospace;
    margin: 0;
    padding: 0;
    background-color: var(--bg-dark);
    color: var(--primary-green);
}

/* BACK LINK (usado en todas las subpáginas) */
.back-link {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 0.9rem;
    color: var(--text-gray);
    text-decoration: none;
    border: 1px solid var(--text-gray);
    padding: 8px 15px;
    transition: all 0.3s ease;
}

.back-link:hover {
    color: var(--primary-green);
    border-color: var(--primary-green);
    box-shadow: var(--glow-medium);
}

/* TÍTULOS COMUNES */
h1 {
    font-size: 2.5rem;
    text-shadow: var(--glow-medium);
    text-align: center;
}

h2 {
    font-size: 2.1rem;
    margin: 3rem 0 2rem 0;
    color: var(--primary-green);
    text-shadow: var(--glow-small);
}

h3 {
    font-size: 1.5rem;
    color: var(--primary-green);
    margin: 3rem 0 1rem 0;
    text-shadow: var(--glow-tiny);
}

/* BOTONES COMUNES */
.btn {
    font-family: inherit;
    background: transparent;
    border: 2px solid var(--primary-green);
    color: var(--primary-green);
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: block;
    text-align: center;
}

.btn:hover {
    background-color: var(--primary-green);
    color: var(--bg-dark);
    box-shadow: var(--glow-large);
}

/* CONTENEDORES COMUNES */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 20px 40px 20px;
}

/* ESTILOS PARA PÁGINAS DE NAVEGACIÓN Y PRINCIPAL */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

/* Para páginas de navegación que no tienen subtitle */
.hero h1.nav-title {
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.subtitle {
    font-size: 1.5rem;
    margin-bottom: 3rem;
    color: var(--text-gray);
}

.buttons {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 0 auto;
    max-width: 300px;
}

.buttons.nav-buttons {
    max-width: 400px;
}

.hero .btn {
    padding: 15px 30px;
    font-size: 1.2rem;
}

.hero .btn.nav-btn {
    padding: 20px 30px;
    font-size: 1.1rem;
    line-height: 1.3;
}

.hero .btn.nav-btn:hover {
    transform: translateY(-2px);
}

.content-section {
    padding: 4rem 2rem;
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
    line-height: 1.6;
}

.content-section p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.content-section a {
    color: var(--text-white);
    text-decoration: none;
}

.content-section a:hover {
    text-shadow: var(--glow-small);
}

.contact {
    font-size: 0.9rem;
    color: var(--text-gray);
    padding: 2rem;
    border-top: 1px solid var(--border-gray);
    margin-top: 2rem;
    text-align: center;
}

.contact a {
    color: var(--text-gray);
    text-decoration: none;
}

.contact a:hover {
    color: var(--primary-green);
    text-shadow: var(--glow-small);
}

/* ESTILOS PARA PÁGINA DE RECOMENDACIONES */
.text-content {
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    text-align: justify;
    line-height: 1.6;
}

.text-content a {
    color: var(--text-white);
    text-decoration: none;
}

.text-content a:hover {
    text-shadow: var(--glow-small);
}

.book-title {
    font-style: italic;
}

.section {
    margin-bottom: 4rem;
}

/* ESTILOS ESPECÍFICOS PARA RESÚMENES */
.year-button {
    width: 100%;
    padding: 20px;
    font-size: 1.3rem;
    font-family: inherit;
    background: transparent;
    border: 2px solid var(--primary-green);
    color: var(--primary-green);
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 10px;
    text-align: left;
    position: relative;
}

.year-button:hover {
    background-color: var(--primary-green);
    color: var(--bg-dark);
    box-shadow: var(--glow-large);
}

.year-button.active {
    background-color: var(--dark-green);
    border-color: var(--secondary-green);
}

.year-button::after {
    content: '+';
    position: absolute;
    right: 20px;
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.year-button.active::after {
    transform: rotate(45deg);
}

.year-content {
    display: none;
    padding: 20px;
    border-left: 3px solid var(--primary-green);
    margin-bottom: 20px;
    background-color: var(--bg-darker);
}

.year-content.active {
    display: block;
}

.subject {
    margin-bottom: 2rem;
}

.subject h3 {
    color: var(--secondary-green);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-gray);
    text-shadow: none;
    margin-top: 0;
}

.pdf-link {
    display: block;
    padding: 10px 15px;
    margin-bottom: 8px;
    background: transparent;
    border: 1px solid var(--border-medium);
    color: var(--text-light);
    text-decoration: none;
    transition: all 0.3s ease;
}

.pdf-link:hover {
    border-color: var(--primary-green);
    color: var(--primary-green);
    background-color: var(--light-green);
    transform: translateX(5px);
}

.empty-year {
    color: var(--border-medium);
    font-style: italic;
    padding: 20px;
    text-align: center;
}

/* ESTILOS ESPECÍFICOS PARA HISTORIA */
.quote {
    background-color: var(--bg-darker);
    border-left: 4px solid var(--primary-green);
    padding: 20px;
    margin: 20px 0;
    margin-top: 3rem;
    margin-bottom: 2rem;
}

.quote-text {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 10px;
    font-style: italic;
}

.quote-author {
    color: var(--secondary-green);
    font-style: normal;
    font-weight: bold;
    text-align: right;
}

.meme-container {
    text-align: center;
    margin: 2rem 0;
    padding: 20px;
    background-color: var(--bg-darker);
    border: 2px dashed var(--border-gray);
}

.meme-img {
    max-width: 100%;
    height: auto;
    border: 2px solid var(--primary-green);
}

.meme-placeholder {
    color: var(--border-medium);
    font-style: italic;
    padding: 40px;
}

/* =============================================== */
/* ESTILOS PARA CALCULADORAS/CONVERTIDORES        */
/* =============================================== */

/* Estructura principal del conversor */
.converter-section {
    margin: 6rem 0;
    border: 2px solid var(--primary-green);
    background-color: var(--bg-darker);
}

.converter-title {
    background-color: var(--primary-green);
    color: var(--bg-dark);
    padding: 15px;
    margin: 0;
    font-size: 1.5rem;
    text-align: center;
    text-shadow: none;
}

.converter-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    min-height: 400px;
}

.input-side {
    border-right: 2px solid var(--primary-green);
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: stretch;
}

.results-side {
    padding: 30px;
    background-color: var(--bg-dark);
}

/* Grupos de entrada y inputs */
.input-group {
    margin-bottom: 20px;
    width: 100%;
}

.input-group label {
    display: block;
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--text-light);
}

.input-group input {
    width: 100%;
    padding: 12px;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    background: transparent;
    border: 2px solid var(--border-medium);
    color: var(--primary-green);
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: var(--glow-small);
}

/* Botones de conversión */
.convert-btn {
    width: 100%;
    padding: 15px;
    font-family: inherit;
    font-size: 1.1rem;
    background: transparent;
    border: 2px solid var(--primary-green);
    color: var(--primary-green);
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 20px;
    box-sizing: border-box;
}

.convert-btn:hover {
    background-color: var(--primary-green);
    color: var(--bg-dark);
    box-shadow: var(--glow-large);
}

/* Sistema de resultados */
.results-container {
    display: none;
}

.results-container.show {
    display: block;
}

.result-item {
    margin-bottom: 20px;
    padding: 15px;
    border-left: 3px solid var(--secondary-green);
    background-color: var(--bg-darker);
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 8px;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    hyphens: none;
}

.result-value {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: var(--primary-green);
    text-shadow: var(--glow-tiny);
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    hyphens: none;
}

.error-result {
    border-left-color: var(--primary-green);
}

.error-result .result-value {
    color: var(--primary-green);
}

/* Secciones de explicación para calculadoras */
.explanation-section {
    margin-top: 8rem;
    padding: 40px;
    border: 2px solid var(--border-gray);
    background-color: var(--bg-darker);
    text-align: justify;
    margin-bottom: 3rem;
}

.explanation-section h2 {
    margin-top: 0;
    color: var(--primary-green);
}

.explanation-section p {
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.explanation-section a {
    color: var(--text-white);
    text-decoration: none;
}

.explanation-section a:hover {
    text-shadow: var(--glow-small);
}

/* CANVAS CONTAINERS */
.canvas-container {
    text-align: center;
    margin: 3rem 0;
    padding: 30px;
}

.canvas-container h2 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--primary-green);
    text-shadow: var(--glow-small);
}

/* Tratamiento especial para el segundo canvas */
.second-canvas-container {
    max-width: 840px !important;
    margin: 3rem auto;
    padding: 30px 20px;
    text-align: center;
}

.second-canvas-container #newtonCanvas2 {
    width: 800px;
    height: 600px;
    margin: 0 auto;
    display: block;
}

#gaussCanvas {
    border: 2px solid var(--border-medium);
    background-color: #000;
}

/* =============================================== */
/* SYNTAX HIGHLIGHTING PARA CÓDIGO                */
/* =============================================== */

.code-section {
    margin: 4rem 0;
    border: 2px solid var(--primary-green);
    background-color: var(--bg-darker);
}

.code-title {
    background-color: var(--primary-green);
    color: var(--bg-dark);
    padding: 15px;
    margin: 0;
    font-size: 1.3rem;
    text-align: center;
    text-shadow: none;
}

.code-content {
    padding: 30px;
}

.code-block {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-medium);
    padding: 25px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-light);
    overflow-x: auto;
    line-height: 1.4;
    white-space: pre;
}

/* Syntax highlighting para JavaScript/p5.js */
.keyword { color: #ff79c6; font-weight: bold; }
.function { color: #50fa7b; }
.number { color: #bd93f9; }
.string { color: #f1fa8c; }
.comment { color: #6272a4; font-style: italic; }
.class-name { color: #8be9fd; font-weight: bold; }
.property { color: #50fa7b; }
.this { color: #ff79c6; font-style: italic; }

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
    .back-link {
        position: static;
        display: block;
        text-align: center;
        margin: 20px auto;
        width: fit-content;
    }
    
    .container {
        padding-top: 40px;
        padding-left: 15px;
        padding-right: 15px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.7rem; }
    h3 { font-size: 1.3rem; }
    
    .hero h1 { font-size: 2rem; }
    .subtitle { font-size: 1.2rem; }
    .btn { font-size: 1rem; }
    
    .hero .btn { 
        padding: 12px 25px; 
        font-size: 1rem;
    }
    
    .hero .btn.nav-btn { 
        font-size: 1rem; 
        padding: 15px 25px; 
    }
    
    .content-section { 
        padding: 3rem 1.5rem; 
    }

    .text-content {
        text-align: left;
    }
    
    .year-button { 
        font-size: 1.1rem; 
        padding: 15px; 
    }

    /* Responsive para calculadoras */
    .converter-content {
        grid-template-columns: 1fr;
    }
    
    .input-side {
        border-right: none;
        border-bottom: 2px solid var(--primary-green);
    }

    /* Responsive para canvas */
    .code-content {
        padding: 20px;
    }
    
    .code-block {
        padding: 15px;
        font-size: 0.8rem;
    }

    .second-canvas-container {
        max-width: 100% !important;
        padding: 20px 15px;
    }

    .second-canvas-container #newtonCanvas2 {
        width: 100%;
        max-width: 800px;
        height: auto;
    }
}

#final-source a {
    color: var(--primary-green);
    text-decoration: none;
    text-shadow: var(--glow-tiny);
}

#final-source a:hover {
    text-shadow: var(--glow-small);
}

footer.contact p {
  margin: 1rem 0; /* ajustá el espacio vertical entre renglones */
}