/* ========================================
   ESTILOS GENERALES
   ======================================== */
:root {
    --color-primario: #1e3a5f;
    --color-secundario: #2d5a87;
    --color-acento: #4a90d9;
    --color-blanco: #ffffff;
    --color-gris-claro: #f5f7fa;
    --color-gris-oscuro: #4a5568;
    --color-peligro: #dc2626;
    --color-exito: #059669;
    --sombra-texto: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

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

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

/* ========================================
   ENCABEZADO Y NAVEGACIÓN
   ======================================== */
.encabezado {
    background: linear-gradient(135deg, var(--color-primario) 0%, var(--color-secundario) 100%);
    color: var(--color-blanco);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--sombra-texto);
}

.encabezado-contenido {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icono {
    width: 45px;
    height: 45px;
}

.logo-texto {
    font-size: 1.4rem;
    font-weight: 700;
}

.logo-subtexto {
    font-size: 0.75rem;
    opacity: 0.9;
    font-weight: 400;
}

.navegacion {
    display: flex;
    gap: 25px;
}

.navegacion a {
    color: var(--color-blanco);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
    padding: 5px 10px;
    border-radius: 4px;
}

.navegacion a:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* ========================================
   HERO / BANER PRINCIPAL
   ======================================== */
.hero {
    background: linear-gradient(135deg, var(--color-primario) 0%, var(--color-acento) 100%);
    color: var(--color-blanco);
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    font-weight: 800;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.95;
}

.boton-hero {
    display: inline-block;
    background: var(--color-blanco);
    color: var(--color-primario);
    padding: 15px 35px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.3s, box-shadow 0.3s;
}

.boton-hero:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* ========================================
   SECCIONES GENERALES
   ======================================== */
.seccion {
    padding: 60px 0;
}

.seccion-clara {
    background: var(--color-gris-claro);
}

.seccion-titulo {
    text-align: center;
    margin-bottom: 40px;
}

.seccion-titulo h2 {
    font-size: 2.2rem;
    color: var(--color-primario);
    margin-bottom: 10px;
}

.seccion-titulo p {
    color: var(--color-gris-oscuro);
    font-size: 1.1rem;
}

/* ========================================
   TARJETAS DE INFORMACIÓN
   ======================================== */
.tarjetas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.tarjeta {
    background: var(--color-blanco);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.tarjeta:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.tarjeta-icono {
    width: 55px;
    height: 55px;
    background: linear-gradient(135deg, var(--color-acento) 0%, var(--color-secundario) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.tarjeta-icono svg {
    width: 30px;
    height: 30px;
    fill: var(--color-blanco);
}

.tarjeta h3 {
    color: var(--color-primario);
    margin-bottom: 12px;
    font-size: 1.2rem;
}

.tarjeta ul {
    list-style: none;
    padding-left: 0;
}

.tarjeta li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    font-size: 0.95rem;
}

.tarjeta li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-exito);
    font-weight: bold;
}

/* ========================================
   SECCIÓN DE EMERGENCIAS
   ======================================== */
.alerta-emergencia {
    background: linear-gradient(135deg, var(--color-peligro) 0%, #b91c1c 100%);
    color: var(--color-blanco);
    border-radius: 12px;
    padding: 40px;
    margin-top: 40px;
    text-align: center;
}

.alerta-emergencia h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.alerta-emergencia ul {
    list-style: none;
    text-align: left;
    max-width: 500px;
    margin: 0 auto;
}

.alerta-emergencia li {
    padding: 8px 0;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.numeros-emergencia {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.numero-item {
    background: rgba(255, 255, 255, 0.2);
    padding: 15px 25px;
    border-radius: 8px;
}

.numero-item strong {
    display: block;
    font-size: 1.5rem;
}

/* ========================================
   TIPOS DE GASES TÓXICOS
   ======================================== */
.tabla-gases {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-blanco);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.tabla-gases th {
    background: var(--color-primario);
    color: var(--color-blanco);
    padding: 18px 15px;
    text-align: left;
    font-weight: 600;
}

.tabla-gases td {
    padding: 15px;
    border-bottom: 1px solid #e2e8f0;
}

.tabla-gases tr:hover {
    background: var(--color-gris-claro);
}

.nivel-peligro {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.peligro-alto {
    background: #fee2e2;
    color: #991b1b;
}

.peligro-medio {
    background: #fef3c7;
    color: #92400e;
}

.peligro-bajo {
    background: #d1fae5;
    color: #065f46;
}

/* ========================================
   PREVENCIÓN Y BUENAS PRÁCTICAS
   ======================================== */
.practicas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.practica-item {
    display: flex;
    gap: 20px;
    background: var(--color-blanco);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.practica-numero {
    width: 50px;
    height: 50px;
    background: var(--color-primario);
    color: var(--color-blanco);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    flex-shrink: 0;
}

.practica-contenido h4 {
    color: var(--color-primario);
    margin-bottom: 8px;
}

.practica-contenido p {
    font-size: 0.95rem;
    color: var(--color-gris-oscuro);
}

/* ========================================
   MANTENIMIENTO
   ======================================== */
.checklist-mantenimiento {
    background: var(--color-blanco);
    border-radius: 12px;
    padding: 35px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.checklist-mantenimiento h3 {
    color: var(--color-primario);
    margin-bottom: 25px;
    font-size: 1.4rem;
}

.checklist-columnas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.checklist-col h4 {
    color: var(--color-secundario);
    margin-bottom: 15px;
    font-size: 1.1rem;
    border-bottom: 2px solid var(--color-acento);
    padding-bottom: 8px;
}

.checklist-col ul {
    list-style: none;
}

.checklist-col li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    border-bottom: 1px solid #e2e8f0;
}

.checklist-col li::before {
    content: "☐";
    position: absolute;
    left: 0;
    color: var(--color-acento);
    font-size: 1.1rem;
}

/* ========================================
   FOOTER / PIE DE PÁGINA
   ======================================== */
.pie-pagina {
    background: var(--color-gris-oscuro);
    color: var(--color-blanco);
    padding: 50px 0 20px;
}

.pie-contenido {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.pie-seccion h4 {
    color: var(--color-blanco);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.pie-seccion p, .pie-seccion a {
    color: #cbd5e0;
    font-size: 0.95rem;
    line-height: 1.8;
    text-decoration: none;
}

.pie-seccion a:hover {
    color: var(--color-acento);
}

.contacto-lista {
    list-style: none;
}

.contacto-lista li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.contacto-lista svg {
    width: 20px;
    height: 20px;
    fill: var(--color-acento);
    flex-shrink: 0;
}

/* ========================================
   BANNER DE POLÍTICAS
   ======================================== */
.banner-politicas {
    background: linear-gradient(135deg, var(--color-blanco) 0%, #e8f4fc 100%);
    border-top: 3px solid var(--color-primario);
    padding: 25px 0;
}

.banner-contenido {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
}

.banner-politicas a {
    color: var(--color-primario);
    text-decoration: none;
    font-weight: 600;
    padding: 8px 18px;
    border: 2px solid var(--color-primario);
    border-radius: 25px;
    transition: all 0.3s;
}

.banner-politicas a:hover {
    background: var(--color-primario);
    color: var(--color-blanco);
}

.derechos {
    color: var(--color-primario);
    font-size: 0.9rem;
    font-weight: 500;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .encabezado-contenido {
        flex-direction: column;
        gap: 15px;
    }

    .navegacion {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .seccion-titulo h2 {
        font-size: 1.8rem;
    }

    .tabla-gases {
        font-size: 0.85rem;
    }

    .tabla-gases th, .tabla-gases td {
        padding: 10px 8px;
    }

    .numeros-emergencia {
        flex-direction: column;
        align-items: center;
    }

    .banner-contenido {
        flex-direction: column;
        gap: 15px;
    }
}