/* ===========================
   Variables CSS y Reset
   =========================== */

:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #06b6d4;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --gray-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
}

/* ===========================
   Contenedores y Layout
   =========================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===========================
   Navegación
   =========================== */

.navbar {
    background-color: var(--dark-color);
    padding: 1rem 0;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-size: 1.8rem;
    font-weight: bold;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
}

.nav-menu a:hover,
.nav-menu a.active {
    background-color: var(--primary-color);
}

/* ===========================
   Secciones
   =========================== */

.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.page-header {
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.page-header h2 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.content-section {
    padding: 3rem 0;
}

section {
    margin-bottom: 2rem;
}

/* ===========================
   Artículos y Contenido
   =========================== */

article {
    background: white;
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

article h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

article h4 {
    color: var(--secondary-color);
    margin: 1.5rem 0 1rem;
    font-size: 1.3rem;
}

article p {
    margin-bottom: 1rem;
    text-align: justify;
}

/* ===========================
   Tarjetas y Grids
   =========================== */

.tools-grid,
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tool-card,
.resource-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.tool-card:hover,
.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.tool-card h4,
.resource-card h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* ===========================
   Formularios
   =========================== */

.math-form {
    background: var(--light-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

input[type="number"],
input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

input[type="number"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.hint {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-color);
    margin-top: 0.25rem;
}

.complex-input {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.complex-input input {
    flex: 1;
}

.complex-input span {
    font-weight: bold;
    color: var(--primary-color);
}

.radio-group {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

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

/* ===========================
   Botones
   =========================== */

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

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

.btn-secondary {
    background-color: var(--gray-color);
}

.btn-operation {
    background-color: var(--accent-color);
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

/* ===========================
   Resultados
   =========================== */

.result-box,
.info-box {
    background: var(--light-color);
    border-left: 4px solid var(--success-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-top: 1.5rem;
}

.result-box.error {
    border-left-color: var(--error-color);
    background-color: #fef2f2;
}

.result-box h4 {
    color: var(--success-color);
    margin-bottom: 1rem;
}

.result-box .placeholder {
    color: var(--gray-color);
    font-style: italic;
}

/* ===========================
   Tablas
   =========================== */

.info-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: white;
    box-shadow: var(--box-shadow);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.info-table thead {
    background-color: var(--primary-color);
    color: white;
}

.info-table th,
.info-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.info-table tbody tr:hover {
    background-color: var(--light-color);
}

.info-table tbody tr:last-child td {
    border-bottom: none;
}

/* ===========================
   Fórmulas
   =========================== */

.formula {
    background: white;
    border: 2px solid var(--primary-color);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    text-align: center;
    color: var(--dark-color);
}

/* ===========================
   Canvas y Visualizaciones
   =========================== */

.canvas-section,
.canvas-wrapper {
    text-align: center;
    margin: 2rem 0;
}

canvas {
    border: 2px solid #e2e8f0;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 100%;
    height: auto;
    background: white;
}

/* ===========================
   Video
   =========================== */

.video-section {
    background: white;
    padding: 3rem 0;
}

.video-wrapper {
    max-width: 800px;
    margin: 2rem auto;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

video {
    width: 100%;
    height: auto;
    display: block;
}

.video-caption {
    text-align: center;
    color: var(--gray-color);
    margin-top: 1rem;
    font-style: italic;
}

/* ===========================
   Mapa
   =========================== */

.map-section {
    background: white;
    padding: 3rem 0;
}

.map-container {
    width: 100%;
    height: 450px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    margin-top: 1.5rem;
}

/* ===========================
   Galería de Imágenes
   =========================== */

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

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

.gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.gallery-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

figcaption {
    padding: 1rem;
    text-align: center;
    color: var(--dark-color);
    font-size: 0.9rem;
}

/* ===========================
   Calculadora
   =========================== */

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

.calculator-panel,
.result-panel {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* ===========================
   Footer
   =========================== */

footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .calculator-grid {
        grid-template-columns: 1fr;
    }

    .tools-grid,
    .resources-grid {
        grid-template-columns: 1fr;
    }

    .button-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .image-gallery {
        grid-template-columns: 1fr;
    }
}

/* ===========================
   Animaciones
   =========================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-box,
.info-box {
    animation: fadeIn 0.5s ease;
}

/* ===========================
   Utilidades
   =========================== */

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }